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A research on existing problem and countermeasure for the management of university's large equipment | This paper analyses the problems existed in the management of the large equipment and discusses several corresponding resolvable schemes from management mechanism,control and training,in order to improve its usage efficiency. | In electric power system, the artificial misoperatio n accident occurs n ow and then, and it conduces comparatively economic loss and influence, therefor e the anti-misoperation of the substation should be improved correspondingly. Ac cording to the wiring design of the electromagnetic lock anti-misoperation, the p aper systematically introduces the anti-misoperation design of bus line ground s witch, single bus ground outgoing line's isolating switch and double bus line is olating switch, and indicates substation adopting the electromagnetic lock, prog ram lock and computer can prevent the misoperation effectively. | eng_Latn | 5,100 |
Electric power conversion device | An electric power conversion device having an overcurrent protection circuit that, when an overcurrent has occurred in a semiconductor switching element in a lower-side arm of a half-bridge circuit, stops ON/OFF drive of the semiconductor switching element, said overcurrent protection circuit being provided in a drive circuit that drives the semiconductor switching element. Provided in the lower-side arm drive circuit is an alarm signal generation circuit that generates: a first alarm signal when the overcurrent protection circuit for the lower-side arm is operating; and a second alarm signal when the current that flows to a free-wheeling diode inversely connected to the lower-side arm semiconductor switching element exceeds a current limit value. | The article introduces the teaching reformation focusing on course project of power engineering detection and control technology, and discusses the new reformation in the future. | eng_Latn | 5,101 |
The interconnect penalty of small size switches (Tutorial Corner) | In accordance with an example embodiment, a method of operating a work vehicle with an ejector body may include receiving a position signal indicative of a position of the work vehicle, receiving a target profile indicative of a target topography for an area, receiving an ejection command at a controller and entering the controller into an ejection mode based on the ejection command, and controlling, with the controller, in the ejection mode, at least one of a speed of the work vehicle and a speed of an ejector included in the ejector body based on the position signal and the target profile, to spread a load of material from the ejector body onto a ground surface. | Based on 80C196MCS a power factor controlling device is designed.This device adjust voltage through SCR to adjust power factor,and it contains a softstart component and various protecting systems.Experi-ments show that the device works well and effectively under under-loading or changed load circumstances. | eng_Latn | 5,102 |
Improved glass-ceramic envelope for vacuum interrupters | This study describes an improved hermetic glass-ceramic-to-metal seal which provides a high strength mechanical joint. The new sealing joint reduces electrical stress at the metal interface and is especially suitable for vacuum interrupters designed for high voltage applications requiring high reliability. An improved design of the glass-ceramic-to-metal seal is presented which uses a ‘U' section metal end flange. A novel high voltage vacuum interrupter design is presented for a load break switch and fault interrupting applications using fewer components than at present. It has been shown how different features can be incorporated into the glass-ceramic envelopes to avoid the requirement for metallic vapour shields or for external sheds or corrugations to enhance dielectric behaviour. The design could be used directly for an outdoor application eliminating the need for external insulation. Finite element modelling has been used to analyse the seal and interrupter design mechanically and electrically. | This work was supported by the UK Engineering and Physical Sciences Research Council (EPSRC) grant EP/K02924X/1. E.O.R. is supported by an EPSRC DTA studentship (University of Cambridge), and F.D.D. is supported by the Honorary Vice-Chancellor’s Award and a Qualcomm/DTA Studentship. | eng_Latn | 5,103 |
Fluctuation Theory for Space‐Charge‐Limited Currents | A phenomenological fluctuation theory is presented for 1‐dimensional space‐charge‐limited currents in ideal nonmetallic solids. Notwithstanding the essential nonlinearity of the dynamical equation which governs the potential field, the theory is solved exactly for an initial statistical state that is associated with a probability measure of Gaussian form in an auxiliary field variable. | In this paper the need for advanced modeling and calculation procedures of Power Flow and Short-Circuit calculations caused by connection of electronically coupled energy resources is discussed. Power Flow and Short-Circuit calculations are basic power applications in software packages for transmission and distribution systems management (EMS and DMS). Modeling and calculations of these applications have been successfully performed for the last several decades for traditional systems. However, the nature of transmission and distribution systems has been drastically changed in the last two decades. This change is mainly caused by integration of electronically coupled energy resources such as wind, solar, energy storage, etc. The aim of this paper is to illustrate that traditional modeling and calculations of the basic EMS and DMS power applications are inadequate for emerging transmission and distribution systems, and to indicate to the necessary directions for future research. | yue_Hant | 5,104 |
Twist prevention weatherproof power flexible cable for wind power generation | The utility model discloses a twist prevention weatherproof power flexible cable for wind power generation. The power flexible cable comprises a cable core, wherein an outer sheath layer is arranged outside the cable core; the cable core comprises a plurality of stranded insulated cores; and a filling strip is arranged at the center of the cable core. The utility model is characterized in that each insulated core consists of a conductor, an isolating layer wound outside the conductor and an insulating layer positioned outside the isolating layer, and talcum powder is coated outside the insulated cores. The power flexible cable has the advantages of good twisting and sliding prevention property, and can satisfy the requirement for wind power generation in harsh environment. | Australian electricity distribution businesses use a vast number of poles in their networks. In making their purchase decisions, they can choose between types of pole. It might come from an old-growth forest or a plantation, or be made from cement, steel or fibreglass. This paper discusses how Australian electricity distribution businesses currently account (or fail to account) for the social and environmental implications of the production and use of power poles. The discussion highlights the many factors to be considered in a life-cycle costing exercise. The paper provides suggestions for future practice which have implications not only for electricity distribution businesses, but for industry generally. | eng_Latn | 5,105 |
Ranking of Wire Insulation for Spacecraft Use | Insulated wires are important for the reliable supply of electrical energy in aircraft and spacecraft applications. Damage to the wire insulation in the electrical network can lead to a high-current arc burning between the metal conductors of the wire, which may cause a breakdown of the whole electrical system. In the past, numerous fault arc tests on insulated wires for space application have been performed at Darmstadt University of Technology, High Voltage Laboratory (TUD/HVL) in cooperation with the European Space Agency (ESA/ESTEC). Based on these studies a test proposal was prepared and is discussed in relevant standardization organizations up to the present time. This proposal is referred to as the ‘advanced fault arc resistance test’ Proposal International Standard 1998 Space systems–arc tracking test, cables and wires: advanced fault arc resistance test ISO/TC20/SC14/WG 1, 14N118. The insulated wires are tested under different stress and environmental conditions. The experimental results as well ... | Abstract Reducing the specimen-probe spacing to increase the sensitivity of measurement of weak remanence in geological samples, etc. introduces potential inaccuracies. These are analysed by comparing the field distributions derived for transversely magnetized cylinders with those for dipoles and for nulling coils. An optimum coil geometry is found. | eng_Latn | 5,106 |
A Novel Failure Indicator of Earth Grounding and Short Circuit | A new kind of indicator of earth grounding and short circuit fault is introduced in the paper.This device owns many advantages:The strong and weak power is well isolated by photoelectric device;It is conveniently to be fixed and it costs lower power. | In the light of the present situation that the faults of the resistor braking cabinet of 8G locomotives occur frequently and endanger the safe operation of locomotives,this paper analyzes the reasons of the faults from equipment's working principles,and according to the actual feasibility,puts forward the transformation program. | eng_Latn | 5,107 |
THE METALWORKING BEHIND OUR FIRST NUCLEAR POWER STATION. PART 2. NOTHING BUT WELDING PERFECTION PERMITTED | The welding performed in the manufacture of the NPD-2 nuclear power station is described. For welding operations on both the calandria and moderator dump tank, the inert gas-shielded metal-arc process was specified and, wherever possible, fully automatic welding was employed. Every type of weld point was completely prototyped and tested by x ray, fluorescent penetrants, and macro- and micro-tests. In order to seal the fuel elements to prevent corrosion and to contain the fission product gases, a process was developed for fusion welding of the Zircaloy-2 sheath and the solid Zircaloy-2 end plug. (M.C.G.) | The paper introduces a detection and guard system based on Lon Works technology and power line carrier wave for the state of railway device box. It describes the design thought and method of the system. | yue_Hant | 5,108 |
Time domain analysis of transient grounding resistance of various grounding electrodes | In this paper,the time domain analysis of transient grounding resistance(TGR)of grounding electrode is conducted with finite-difference time-domain(FDTD)method.The TGR of various grounding electrodes under pulsed discharging current are calculated,and the influence of the variations of grounding electrode on the TGR is analyzed.Some conclusions are obtained from the analysis,which is useful in analyzing and designing of the grounding system. | Natural resource preservation has recently become a significant concern,and has motivated research and development efforts to assist in both conservation and management.Electricity usage in residential and commercial buildings represents a significant fraction of total energy expenditure.A key prerequisite for energy conservation is knowing when and where energy is being spent.However,in the current energy reporting devices only provide coarse grained information.This paper presents a fine grained power auditing system based on the sensor networks.This system can provide detailed information about the total energy consumption in any period for each appliance and thus will become an efficient tool for future real-time pricing.At the same,some behavior model can be drawn from the collected data based on the proposed system. | eng_Latn | 5,109 |
Why is electrical cords covered in rubber or plastic? | Why is there a rubber covering around the cord of an electrical appliance? | Why is there a rubber covering around the cord of an electrical appliance? | eng_Latn | 5,110 |
What damge can an electric shock do to you? | What electrical shock current can cause interference with the nervous control system? | Why are wooden roller coasters slower than electric roller coasters? | eng_Latn | 5,111 |
When electric power is transmitted over long distances line losses can be reduced by generating ac rather than dc voltage and by transmitting? | Why is it advantageous to transmit electrical power to long distance at high voltage? | Why is it advantageous to transmit electrical power to long distance at high voltage? | eng_Latn | 5,112 |
What did Michael Faraday do in his lifetime? | Was michael faraday a butcher? | What were michael faraday's accomplishments? | eng_Latn | 5,113 |
With the widespread establishment of electrical grids , power transmission is usually associated most with electric power transmission . | With widespread establishment of power grids , power transmission has came to be associated most often with electric power transmission . | Experimenters use the following elements that are used in beamlines for conditioning the radiation beam between the storage ring and the end station : The combination of beam conditioning devices controls the thermal load ( heating caused by the beam ) at the end station ; the spectrum of radiation incident at the end station ; and the focus or collimation of the beam . | eng_Latn | 5,114 |
Does this block the other outlet receptacle? | I put it in the upper socket and the lower socket is totally accessible, however the other way around it would be blocking the other outlet. | measure the distance between the two prongs and see if the measurement is the same as the measurement given in the picture, if the measurement is the same then I would guess it should fit. | eng_Latn | 5,115 |
Will this unit work for High Tech Humane Contain HC-8000 contanment fence? | I am an electrician and have pretty good understanding of how lightning works. I would not have any wire in the ground without a protector unit. Nothing can guarantee 100% protection when it comes to lightning, but I feel this unit is as safe as it gets. Thanks, Don. | I don't know, but do an internet search for Huck's Products, email the owner Randy, and he will be able to tell you. If it isn't a perfect fit out of the box, Randy will have a way to modify it very inexpensively. He has kept my Total Gym Elite, from 2005, in great working order -- very inexpensively. He sent me plastic shims to make the ab attachment work on my Elite. The shims worked great and I haven't had any problems with them and I use the ab attachment daily. | eng_Latn | 5,116 |
Any advantage over a traditional power strip or surge protector with an on/off switch? | Spacially, these are small, without the length and the cord of the surge protector. I attach them to the end of a single cord and move them with the appliance (window fan for instance). Because of the way they are designed, you can use 2 on an outlet: one doesn't get in the way of the other place to plug-in. Sometimes you just want a switch for an appliance with an iffy switch. This does the job simply. For old, 2-prong ungrounded devices, I thought it might add some grounding (at least is a grounding plug, I presume it helps with grounding, but I'm no electrician). You'd have to check whether these add surge protection..... Spacially, these are small, without the length and the cord of the surge protector. I attach them to the end of a single cord and move them with the appliance (window fan for instance). Because of the way they are designed, you can use 2 on an outlet: one doesn't get in the way of the other place to plug-in. Sometimes you just want a switch for an appliance with an iffy switch. This does the job simply. For old, 2-prong ungrounded devices, I thought it might add some grounding (at least is a grounding plug, I presume it helps with grounding, but I'm no electrician). You'd have to check... » Read More Spacially, these are small, without the length and the cord of the surge protector. I attach them to the end of a single cord and move them with the appliance (window fan for instance). Because of the way they are designed, you can use 2 on an outlet: one doesn't get in the way of the other place to plug-in. Sometimes you just want a switch for an appliance with an iffy switch. This does the job simply. For old, 2-prong ungrounded devices, I thought it might add some grounding (at least is a grounding plug, I presume it helps with grounding, but I'm no electrician). You'd have to check whether these add surge protection..... « Show Less | Good point. I am on the verge of buying 2 of the airport express. One for the living room and the other for my bedroom. The one difference I would see is that airport express has only a single Analog out (RCA jack).. while compared to this squeeze box - as optical out and L/R output. Before I drop $200 on two of the airport express , curious to know how squeeze box is better than airport express. | eng_Latn | 5,117 |
does the folding solar panel need to be protected, If not plugged in, from solar flare or emp? | I merely protect the surface of the panels from scratching, by housing the panels in the cardboard box it was shipped in. The panel surfaces fold outward, rather than inward, hence vulnerable to scratches. I have not done anything to protect them from an environmentally-induced current. | This is really well engineered. There is elastic inside and then two sets of snaps outside for different size wrists. I have short arms, so when it is not rainy hard I roll the flap up that covers the back of the hand past the elastic and the snaps. For me it is a very clever functional design. I am impressed with it. | eng_Latn | 5,118 |
Can you feel the wires if you lay on top of the blanket? | You are not supposed to lay on top of an electric blanket, and no I've never done it, I would think you would feel them though. | Absolutely NOT! As others here advise of overload IF you should have a FIRE your Insurance company may have a clause in your contract - If you do something to contribute to that Fire - even IF you were unawares of the danger in that act - they will not pay you for damage or worse destruction to your home. The device probably advises strongly against what you are asking/thinking to do.If your Home Theatre means that much to you have a NEW LINE installed at that location. | eng_Latn | 5,119 |
Are they sensitive to minor power surges? I had to replace a couple of Netgear XE102 plug in units for that reason. Are these less prone to failure? | I know I had a power surge a few weeks back that destroyed a few of my surge protectors but my netgear plugs still seem to be working fine although I have not done any intense network tests to prove it one way or the other. | I have never needed an adapter. This GE GXRTQR filter with the snap in ends (both-ends) has worked each time for me. You might look at Filtersfast.com as they have alternatives for this GXRTQR filter but I found ordering my last batch through Amazon proved less expensive & quicker for the same filter. | eng_Latn | 5,120 |
Ontology-based models in pervasive computing systems | The Cricket location-support system | Improving electromagnetic compatibility performance of packages and SiP modules using a conformal shielding solution | eng_Latn | 5,121 |
Evaluation of grade prediction using model-based collaborative filtering methods | Next-term student grade prediction | Measurement of AT electric railway system currents at power-supply frequency and validation of a multiconductor transmission-line model | eng_Latn | 5,122 |
EMI Filter Design and Stability Assessment of DC Voltage Distribution based on Switching Converters | The design of DC power distribution for LHC front-end electronics imposes new challenges. Some CMS sub-detectors have proposed to use a DC-power distribution based on DCDC power switching converters located near to the front-end electronics. DC-DC converters operate as a constant power load. They exhibit at the input terminals dynamic negative impedance at low frequencies that can generate interactions between switching regulators and other parts of the input system resulting in instabilities. In addition, switching converters generate interference at both input and output terminals that can compromise the operation of the front-end electronics and neighbour systems. Appropriated level of filtering is necessary to reduce this interference. This paper addresses the instability problem and presents methods of modelling and simulation to assess the system stability and performance. The paper, also, addresses the design of input and output filters to reduce the interference and achieve the performance required. | A proposed Engineering Change (EC) can affect several lifecycle-wide components. Enterprises plan detailed evaluation of only those changes or effects that may have a significant impact. Using past knowledge of engineering changes can prove effective in determining whether an effect is significant. However, comparing ECs for every single attribute is a combinatorial problem, because an EC is composed of a large number of disparate and interdependent attributes. In this paper, we propose an information-theoretic approach to determine important attributes that should be compared to retrieve past ECs similar to the proposed change. Our approach accounts for unknown interdependencies between attributes of disparate datatypes. We believe that the method discussed in this paper will improve overall efficacy of the Engineering Change Management (ECM) process by facilitating fast and reliable evaluation of a proposed EC.Copyright © 2008 by ASME | eng_Latn | 5,123 |
An electrical telegraph is a telegraph that uses electrical signals , usually conveyed via telecommunication lines or radio . | The electrical telegraph is a telegraph that uses electric signals . | Hackers use two methods of delivering malicious code through IM : delivery of virus , trojan , or spyware within an infected file , and the use of `` socially engineered '' text with a web address that entices the recipient to click on a URL that connects him or her to a website that then downloads malicious code . | eng_Latn | 5,124 |
How do I prepare myself for a job of electrical engineer? | How should I prepare for a job in electrical engineering? | How can I survive from an EMP attack to the grid? | eng_Latn | 5,125 |
BRIEF-Funds advised by Apax Partners to buy ECi Software Solutions | Aug 14 (Reuters) - Apax Partners:
* Funds advised by Apax Partners to acquire ECi Software Solutions
* Says concurrent with the transaction, Macola, JobBOSS, MAX businesses of Exact Software will be combined with ECi
* Carlyle will retain a minority ownership position in combined company
* Current ECi senior management team, CEO Ron Books, to continue to lead combined co, which will be known as ECi Software Solutions Source text for Eikon: Further company coverage: | London, UK, – Trade Facilities Services announces to provide Electrical Safety Certificate for the Landlords of London and Essex. They are also offering Landlord Periodic Inspection Report to assure the property and all electrical appliances are safe for tenants.
Electrical Installation Condition Report is very important for landlords especially if they have to rent a room in their property. Usually, local authorities and estate agents accept electrical safety certificate signed by authorized and registered electricians. Trade Facilities Services which provides electrical certificate by engineers are registered with a governing body. They are NAPIT and NICEIC registered company which provide various electrical certificates which include Landlord EICR Inspections, Fire Alarm Certificates, Emergency Light Reports and Portable Appliance Testing.
It’s landlord’s responsibility to ensure that all electrical appliances fitted within the property are safe and secure. They should make sure to have a verified EICR report of their property. Trade Facilities Services provide Periodic Inspection Report (PIR) for landlord throughout London and Essex. They ensure that their engineers check all the appliances, and then they provide an electrical certificate. So, now you don’t have to worry about after-effects of correct paperwork.
Trade Facilities services can electrically test both domestic and commercial properties. They offer a full range of electrical compliance services to ensure that your property is within the true scope of work. For more information regarding landlord electrical certificate, visit the website or contact at 02036371446 to know more.
About the company:
Trade Facilities Services is an electrical testing company that provides (EICR) Electrical installation condition reports. These are otherwise known as Electrical Certificates, Electrical Installation Certificates and Electrical Reports. Trade Facilities Services covers London and Essex and provides all electrical testing in these areas. These include Fire alarms emergency lighting and PAT Testing. All Electricians are registered with NAPIT or the NICEIC and are fully insured and qualified. Trade Facilities Services works on both Domestic and Commercial properties and covers all landlord electrical certification requirements. All EICR reports can be delivered on the day if required and appointments generally only require 24 hours’ notice. | eng_Latn | 5,126 |
Is it safe to unplug a UPS during operation? | Testing a UPS by unplugging it from the wall | Empty intersection and empty union | eng_Latn | 5,127 |
what is instrument mechanic and electrician? | 'ag_iitkgp' almost has it right. When I started out many moons ago in the field of instrumentation, I was for ever being asked "What is that then"? First an 'instrument' is a device used to control or measure variables such as pressure temperature flow level etc etc. In those days ' instrument mechanic' looked after the 'clanky' bits like control valves and bits of pipe work, 'instrument techs' looked after the low voltage and electronic control side of the job.\nAs quite a bit of the initial training was electrical , employers thought they would 'lump in ' electrical to the job title hence instrument/electrical job designation.\nNever a good move to my mind, the two trades are completely seperate.\nHowever my day is done, who am I to say, but while I'm on the subject it took me five years to become a fully trained instrument tech, that is now covered in a couple of months and people are let loose as fully trained??? No chance.\nAs far as technical training goes in the UK we are cra*!\nSorry about that, I got a bit carried away there.\nBut I hope that answers your question? | Insulated overalls, coveralls.....Steal toes are a must have on any rig. If you have to purchase your own clothing, go with Carhart. Do not buy cheap work clothes or boots, there is a big difference. | eng_Latn | 5,128 |
How does oscillations at low frequency limit power transfer in transmission line? | How do oscillations at low frequency limits power transfer over transmission lines? | What are the short term & long term effects of discontinuing Rupees 500 & 1000 notes? How will it tackle corruption? | eng_Latn | 5,129 |
functions of a baler | Key Functions of a Baler The earliest use of balers was on farms where they were employed to compress hay, straw, and cotton into compacted bales that were easily transportable. Most balers are fitted with a pickup device that helps with the process of harvesting hay by feeding the harvested hay into the balers. | A balun is an electrical transformer that is used to convert electrical signals to and from balanced and unbalanced signals. They are normally used to connect lines that have different levels of impedance and are commonly used in the home for connecting HD and traditional antennas. | eng_Latn | 5,130 |
Used by some trains, "Maglev" is short for this | maglev train | transportation | Britannica.com Mar 22, 2016 ... Maglev trains were conceptualized during the early 1900s by American. ... but the magnets are used to repel the train from the guideway rather than attract them. ... the ability to conduct electricity for a short time after power has been cut. ... and a nearby rail station, some 600 metres (about 1,970 feet) away. | Gustav Mahler - Wikipedia Gustav Mahler was an Austrian late-Romantic composer, and one of the leading conductors of .... It is not known whether he saw any of Wagner's operas during his student years. ..... house and cleared its debts, but had won few friendsit was said that he treated his musicians in the way a lion tamer treated his animals. | eng_Latn | 5,131 |
What region within a capacitor develops an electric field? | A capacitor consists of two conductors separated by a non-conductive region. The non-conductive region is called the dielectric. In simpler terms, the dielectric is just an electrical insulator. Examples of dielectric media are glass, air, paper, vacuum, and even a semiconductor depletion region chemically identical to the conductors. A capacitor is assumed to be self-contained and isolated, with no net electric charge and no influence from any external electric field. The conductors thus hold equal and opposite charges on their facing surfaces, and the dielectric develops an electric field. In SI units, a capacitance of one farad means that one coulomb of charge on each conductor causes a voltage of one volt across the device. | A new approach to avoiding overhead wires is taken by the "second generation" tram/streetcar system in Bordeaux, France (entry into service of the first line in December 2003; original system discontinued in 1958) with its APS (alimentation par sol – ground current feed). This involves a third rail which is flush with the surface like the tops of the running rails. The circuit is divided into segments with each segment energized in turn by sensors from the car as it passes over it, the remainder of the third rail remaining "dead". Since each energized segment is completely covered by the lengthy articulated cars, and goes dead before being "uncovered" by the passage of the vehicle, there is no danger to pedestrians. This system has also been adopted in some sections of the new tram systems in Reims, France (opened 2011) and Angers, France (also opened 2011). Proposals are in place for a number of other new services including Dubai, UAE; Barcelona, Spain; Florence, Italy; Marseille, France; Gold Coast, Australia; Washington, D.C., U.S.A.; Brasília, Brazil and Tours, France. | eng_Latn | 5,132 |
What part of the current is usually strongest? | Returning to the basic concept of current flows in a conductor, consider what happens if a half-wave dipole is not connected to a feed point, but instead shorted out. Electrically this forms a single 1⁄2-wavelength element. But the overall current pattern is the same; the current will be zero at the two ends, and reach a maximum in the center. Thus signals near the design frequency will continue to create a standing wave pattern. Any varying electrical current, like the standing wave in the element, will radiate a signal. In this case, aside from resistive losses in the element, the rebroadcast signal will be significantly similar to the original signal in both magnitude and shape. If this element is placed so its signal reaches the main dipole in-phase, it will reinforce the original signal, and increase the current in the dipole. Elements used in this way are known as passive elements. | The London Underground in England is one of the few networks that uses a four-rail system. The additional rail carries the electrical return that, on third rail and overhead networks, is provided by the running rails. On the London Underground, a top-contact third rail is beside the track, energized at +420v DC, and a top-contact fourth rail is located centrally between the running rails at −210v DC, which combine to provide a traction voltage of 630v DC. London Underground is now upgrading its fourth rail system to 750v DC with a positive conductor rail energised to +500v DC and a negative conductor rail energised to -250v DC. However, many older sections in tunnels are still energised to 630v DC. The same system was used for Milan's earliest underground line, Milan Metro's line 1, whose more recent lines use an overhead catenary or a third rail. | eng_Latn | 5,133 |
Book title with a harsh alien world and buoyant balloon-like beings I specifically remember that those buoyant explosive gas filled balloons were an annoyance for flying ships. This is mentioned several times in the book. At the end they seemed to play a very important role in the plot. I also remember ground based predators named Dashers, other named Swifters and the like. I read it in the '90s, it but could be older. | Science Fiction novel or novels about starship that becomes a god, colonizes hostile planet Plot Summary/Details The sharpest memory I have of this one is that it was unusually dense reading. Much more difficult going than most of the sci-fi stuff I'd read by that time (I was 10 or 11, I think). What I remember in terms of plot is that there is a starship, sent either to explore, or colonize, a distant star system. I don't remember the names of any of the characters, but I think maybe they discover they are clones? In any case, something happens to the computer system that the onboard AI becomes sentient and develops a measure of omniscience and omnipotence. It effectively becomes a god of sorts. The next part I can remember, and I'm not sure this is the same book or not, is that the ship has forcibly settled the crew on a hostile planet. All sorts of nasty indigenous life forms live here, and guards are post on the wall outside the settlement to destroy them as they try to enter. I remember there is a female character standing watch, and she goes over the bestiary in her mind. One particularly nasty creature paralyzes you, and then burrows up your spine into your brain (or something like that) if it gets a hold of you. That's all I can recall. Not a lot of detail, unfortunately, but I'm having a tough time remembering much about this one. I never finished the book(s), as they were mostly "over my head" at that age. | What are these fuse-looking cartridge case components on small, battery operated RF tranceivers? I have recently opened up 3 dead, battery-operated RF transceivers lying around, both wearable and key-chains. I've noticed that all three had components that looked like fuses (cartridge case), soldered down, that are quite large compared to the size of the circuit. See the pictures below. I'm not posting full circuit pictures because I don't know if I should, I can update if they are necessary. Device 1: Device 2: Device 3: I can't see why such a device will require a fuse, and I couldn't find any other common components manufactured in cartridge cases, maybe I'm not using the correct name. I don't see them on any applications notes or reference designs for the ICs used either. I've tried to figure out how they are connected to the circuit, I don't have schematics and PCBs are more than 2 layers so they may not be complete, but see the schematics I've figured below. Device 1: Device 2: Device 3: Also, when I do a continuity test between the terminals of the components with a multimeter, resistance starts in ~50 Ohms range and goes down to short as I keep the probes on its terminals so my best guess is something for ESD protection, maybe Varistors or Thermistors? Does anyone know what these components are and why they are there? | eng_Latn | 5,134 |
What invention prevented lines from getting mixed? | To prevent the risk of out-of-phase supplies mixing, sections of line fed from different feeder stations must be kept strictly isolated. This is achieved by Neutral Sections (also known as Phase Breaks), usually provided at feeder stations and midway between them although, typically, only half are in use at any time, the others being provided to allow a feeder station to be shut down and power provided from adjacent feeder stations. Neutral Sections usually consist of an earthed section of wire which is separated from the live wires on either side by insulating material, typically ceramic beads, designed so that the pantograph will smoothly run from one section to the other. The earthed section prevents an arc being drawn from one live section to the other, as the voltage difference may be higher than the normal system voltage if the live sections are on different phases and the protective circuit breakers may not be able to safely interrupt the considerable current that would flow. To prevent the risk of an arc being drawn across from one section of wire to earth, when passing through the neutral section, the train must be coasting and the circuit breakers must be open. In many cases, this is done manually by the drivers. To help them, a warning board is provided just before both the neutral section and an advance warning some distance before. A further board is then provided after the neutral section to tell drivers to re-close the circuit breaker, although drivers must not do this until the rear pantograph has passed this board. In the UK, a system known as Automatic Power Control (APC) automatically opens and closes the circuit breaker, this being achieved by using sets of permanent magnets alongside the track communicating with a detector on the train. The only action needed by the driver is to shut off power and coast and therefore warning boards are still provided at and on the approach to neutral sections. | The predominant school of thought in the 13th century was the Thomistic reconciliation of the teachings of Aristotle with Christian theology. The Condemnation of 1277, enacted at the University of Paris, placed restrictions on ideas that could be interpreted as heretical; restrictions that had implication for Aristotelian thought. An alternative was presented by William of Ockham, who insisted that the world of reason and the world of faith had to be kept apart. Ockham introduced the principle of parsimony – or Occam's razor – whereby a simple theory is preferred to a more complex one, and speculation on unobservable phenomena is avoided. | eng_Latn | 5,135 |
What is another name for electric-field? | The polarization of an antenna refers to the orientation of the electric field (E-plane) of the radio wave with respect to the Earth's surface and is determined by the physical structure of the antenna and by its orientation; note that this designation is totally distinct from the antenna's directionality. Thus, a simple straight wire antenna will have one polarization when mounted vertically, and a different polarization when mounted horizontally. As a transverse wave, the magnetic field of a radio wave is at right angles to that of the electric field, but by convention, talk of an antenna's "polarization" is understood to refer to the direction of the electric field. | Sociological attention to emotion has varied over time. Emilé Durkheim (1915/1965) wrote about the collective effervescence or emotional energy that was experienced by members of totemic rituals in Australian aborigine society. He explained how the heightened state of emotional energy achieved during totemic rituals transported individuals above themselves giving them the sense that they were in the presence of a higher power, a force, that was embedded in the sacred objects that were worshipped. These feelings of exaltation, he argued, ultimately lead people to believe that there were forces that governed sacred objects. | eng_Latn | 5,136 |
How do I accept Jesus Christ? | First shut down your brain, then you can accept anything! | staying inside a 'Faraday Cage' is a good first step. Look up Faraday Cage in Wikipedia | eng_Latn | 5,137 |
Make an Electric Fence | Electric fencing can be dangerous but are a helpful tool for people who own farm livestock or horses. Electric fencing are necessary in order to keep animals safe and contained within the fence. | Have you ever wanted to see your own robot car roving around? Build one with a few electronics parts, an Arduino microcontroller, and copy-paste programming. | eng_Latn | 5,138 |
what is swa | Commonly known as SWA cable, the steel wire armoured cable is a power and auxiliary control cable, designed for use in mains supply electricity. What is an SWA Cable? Commonly known as SWA cable, the steel wire armoured cable is a power and auxiliary control cable, designed for use in mains supply electricity. Used for underground systems, cable networks, power networks, outdoor and indoor applications, and cable ducting. | Commonly known as SWA cable, the steel wire armoured cable is a power and auxiliary control cable, designed for use in mains supply electricity. What is an SWA Cable? Commonly known as SWA cable, the steel wire armoured cable is a power and auxiliary control cable, designed for use in mains supply electricity. Used for underground systems, cable networks, power networks, outdoor and indoor applications, and cable ducting. | eng_Latn | 5,139 |
what glove rating is required for electrical work | Insulating Gloves and Sleeves Insulating gloves and sleeves are critical PPE for electrical work on or near exposed energized parts. The 269 standard (1910.269(l)(2)(i) and (l)(3)) requires that: Additionally, 1910.137 provides specific design, care, and use requirements for rubber electrical protective equipment. Insulating gloves and sleeves must be rated for the voltage to which a worker will be exposed (phase to ground or phase to phase) and marked to indicate their rating. 1910.137 recognizes Class 0 (up to 1KV) through Class 4 (up to 36KV) rubber equipment. [See Mr. Edwin Hill Interpretation Letter (September 27, 2005)]. | Energized work on electrical systems is performed in a number of ways: 1 Typically workers wear insulating (rubber) gloves (with protectors) and also insulating sleeves (if required) when working on live systems. | eng_Latn | 5,140 |
is conduit raceway | With the standard wall thickness of EMT and the strength of steel, Allied Tube & Conduit®âs EMT Conduit and elbows create an Electrical Raceway System recognized as an equipment grounding conductor. EMT conduit is a raceway solution which allows for future wiring changes and provides excellent mechanical protection to conductors and cables. EMT provides EMI shielding and is 100% recyclable. Allied Tube & Conduit®âs mission is to be the leader in providing solutions and more choices for customers. | Conduit is a browser hijacker that is usually installed without the userâs knowledge through a drive-by download. The malware, which is frequently bundled with freeware and shareware, presents as a browser toolbar and search engine. Once installed, Conduit changes the userâs default browser home page and search engine and redirects URLs and Web searches. | eng_Latn | 5,141 |
which class of fire involving energized electrical equipment | Class C fire means a fire involving energized electrical equipment where safety to the employee requires the use of electrically nonconductive extinguishing media. Class D fire means a fire involving combustible metals such as magnesium, titanium, zirconium, sodium, lithium and potassium. | Approach Boundaries to Energized Electrical Conductors Table. (Data from 2015 Editions of NFPA 70E Table 130.4 (D)(a) and CSA. Z462 Table 1A) Personnel Protective Equipment Matrix Table. (Data from 2015 Editions of NFPA 70E Table H.3(b) and. CSA Z462 Table H.2) | eng_Latn | 5,142 |
cause and effects of electrical pollution | earth currents and transients and high frequency noise are sources that cause electrical pollution. Electrical pollution can be one of these causes or a combination of the causes. What you should know about electrical pollution - 1 Stray voltage is also a cause of electrical pollution. and off farms in localized areas. utility infrastructure causing electrical failure. by observing behavioral changes in farm animals and some health problems for humans. in areas of the rural United States. | The health effects of electrical pollution antennae for the current, silently and insidiously assaulting those who play and work nearby. In other words, the wires that deliver electricity have also become conduits for deadly high-frequency radiation, a form of electrical pollution that has largely escaped attention by the medical community. The increased | eng_Latn | 5,143 |
different types of electrical injuries | Humans are more conductive than the earth (the ground we stand on) which means if there is no other easy path, electricity will try to flow through our bodies. There are four main types of injuries: electrocution (fatal), electric shock, burns, and falls. | What are the types of electrical shock injuries? Answer According to the Centers for Disease Control and Prevention (CDC), there are four main types of injuries that can occur as a result of exposure to electricity: fatal electrocution, electric shock, burns, and falls caused by contact with electrical energy. | eng_Latn | 5,144 |
what does emt mean in electrical terms | Conduits: Electrical Metallic Tubing (EMT). Another example of rigid electrical conduit is the EMT, also known as Electrical Metallic Tubing. An EMT conduit is made of steel; in some cases aluminum is also used, cheaper than a galvanized rigid conduit and lighter than a GR conduit. conduit made form galvanized steel tubing is commonly referred as a rigid conduit. The thickness of a galvanized rigid conduit protects the electrical wiring from being hit and allows it to be threaded. Galvanized rigid conduits are used by electricians in commercial and industrial applications. | EMT Basic (also known as EMT I) represents the first component of the Emergency Medical Technician system. An EMT I is trained to care for patients at the scene of an accident while transporting patients by ambulance to the hospital under medical direction. An EMT I has the emergency skills to assess a patients condition and manage respiratory, cardiac and trauma emergencies. | eng_Latn | 5,145 |
what category is an electrical fire | Class C or Class E: Electrical [edit]. Electrical fires are fires involving potentially energized electrical equipment. The US system designates these Class C; the Australian system designates them Class E. This sort of fire may be caused by short-circuiting machinery or overloaded electrical cables. | electrical or electrical apparatus exemption clause. A clause that provides that damage to appliances stemming from electrical currents is only covered if a fire starts. | eng_Latn | 5,146 |
what is a busbar | A busbar is a grounded strip of copper or aluminum that conducts electricity, which acts as a current collector or distributor. These strips can vary in thickness and length, depending on the electrical load it will be assigned to carry. Busbars are used to distribute current to different areas within switchgear. | busbars can have a cross sectional area of as little as 10 square millimetres 0 016 sq in but electrical substations may use metal tubes 50 millimetres 2 0 in in diameter 20 square millimetres 0 031 sq in or more as busbars | eng_Latn | 5,147 |
what is an electrical box | Electrical boxes provide safe links to wiring systems and devices in nearly every structure. Choosing the right type of box and following building codes are key to ensuring your project is strong and secure. Graybar stocks a variety of metallic and non-metallic electrical boxes, including weatherproof boxes, junction boxes, and floor boxes. Graybarâs electrical box accessories offer grounding screws, grounding wires, brackets, extenders, and plates for use in a variety of applications such as new builds and renovations. | an opening or passage by which anything is let out; vent; exit. Electricity. a point on a wiring system at which current is taken to supply electric devices. Also called outlet box. the metal box or receptacle designed to facilitate connections to a wiring system. | eng_Latn | 5,148 |
(In electrics) what is resonance? | What is electrical resonance? | How do I calculate the RM cable requirement from ampere rating? | eng_Latn | 5,149 |
DC Hot Stick developed for first responder, worker safety | ORNL's Bruce Warmack (left) and Nance Ericson display an early prototype of the DC Hot Stick. Credit: Carlos Jones, ORNL/Dept. of Energy With more volts than ever before in electric vehicles (EVs) and on solar-paneled rooftops, first responder and electrical worker safety is a growing concern. Researchers at the Department of Energy's Oak Ridge National Laboratory (ORNL) are addressing the challenge with the development of a probe to accurately detect direct-current (DC) energy.
The DC "Hot Stick" probe designed under the sponsorship of the U.S. Fire Administration, a division of the U.S. Department of Homeland Security, not only detects DC voltage, but also ensures that the probe is properly tapped into the electrical lines being tested. The latter is essential because false negatives may be obtained if a meter is not making proper contact, noted ORNL lead scientist Bruce Warmack of the Electrical and Electronics Systems Research Division.
Exposure to these high voltages is increasingly commonplace as technologies such as hybrid cars, EVs and solar panel arrays, all of which contain large amounts of DC power, are adopted by a growing number of consumers. EVs, for instance, may carry as much as 400-600 volts, Warmack said. Battery packs are typically situated in the rear of EVs, with electrical cables running to the controller up front and to other devices.
"If you can imagine in an accident, a vehicle may be splayed open, and first responders need to know whether the car is carrying a charge before they can even touch it, much less cut through cables and extract a victim," Warmack said. "That much voltage is potentially lethal and can cause arc flash hazards or trigger explosions."
Similarly, installers and other technicians working on solar panel arrays need protection as well. Those installations can carry several hundred volts, Warmack noted.
Nance Ericson and Bruce Warmack test the DC Hot Stick on a hybrid electric vehicle. Credit: Carlos Jones, ORNL/Dept. of Energy
The patent-pending probe that Warmack and his colleagues at ORNL created is designed to penetrate cable insulation and make proven contact with a conductor. The probe then indicates whether a cable is fully discharged of energy.
Making that contact is important. In preliminary work on the project, ORNL researcher Roger Kisner suggested a probe tip verification system that would ensure direct, galvanic contact was made.
One of the challenges for the project was dealing with DC voltage, which is more difficult than AC to work with, Warmack said. "In certain cases you can get electrical fields from DC, but it is easily interfered with by plastics and other kinds of materials. It's more or less a science experiment to find DC unless you make direct contact with the conductor using a voltmeter," he added.
The scientists created a device similar in appearance to most existing AC probes and familiar to first responders. In fact, the DC probe can be designed to slip onto the end of an AC probe, and its functionality is quite simple. A green light indicates proper contact, and if voltage is detected, a red light is illuminated.
The prototype is already being tested on a first responder vehicle in Frederick County, Maryland, Warmack noted. The Fire Administration has provided positive feedback so far, he said.
The DC Hot Stick voltage probe can accurately detect the presence of DC voltages within a hybrid electric vehicle. Credit: Carlos Jones, ORNL/Dept. of Energy
"The probe would give a firefighter or other first responder assurance very quickly that the conductor is either not charged or needs to be handled with care," Warmack said. "Our probe makes sure that an emergency worker or electrician has made contact and isn't just hitting air or a piece of plastic. There's really no tool that does this as effectively. This technology can save lives."
ORNL engineer Nance Ericson, who designed the circuits for the probe, noted that while the system was designed for electric vehicles and solar panels, it could also be used to make measurements in a variety of settings. The circuit he developed can detect the presence of both AC and DC energy—or can ensure that there is no stored energy present—a feature not available in existing electrical instruments.
"We see this technology extending well beyond the first responder community and improving the safety of electrical measurements in a wide variety of applications ranging from industrial power to home appliance repair," Ericson said.
Going forward, Warmack and his colleagues envision the development of more probes to test across the country, as well as versions to check for DC voltage on smaller gauge wires found in other electrical systems. Future work could also see the addition of a microcontroller to the probe to give a digital readout, and to capture and process data.
Explore further: Diagnosing better efficiencies for solar cells | HOUSTON - A bomb squad was called Wednesday evening for a suspicious package found on a sidewalk in Montrose.
The Houston Police Department was investigating if the package, seen on Graustark and Marshal Street, is a pipe bomb.
Officials said inside the package were several prayer candles and a phone charger. They believe someone intentionally left the package.
Central and Bomb Squad just cleared a suspicious device at 4900 Graustark. Two prayer candles were left in a bag by a pole. 202 pic.twitter.com/6gFXwtjGKo — Houston Police (@houstonpolice) May 31, 2018
Police said they were notified about the package from someone who called and said they found a tin ticker and wiring wrapped up in paper in the street.
© 2018 KHOU | eng_Latn | 5,150 |
1980s 'D' Maxell Super Power Ace Red batteries have rusted solid .
His parents hate the musical decoration and try and hide it from their son . | By . Sean O'hare . PUBLISHED: . 12:23 EST, 21 December 2012 . | . UPDATED: . 14:24 EST, 21 December 2012 . Mike Barham with 30-year-old musical Father Christmas that's still running on original batteries . A 30-year-old musical Father Christmas decoration miraculously still plays a tune despite its original batteries having never been changed. The electronic Santa has been belting out a decreasingly accurate Jingle Bells since it was won on a raffle in a pub. But its owner Mike Barham, 32, appears to be the only one pleased by this fact, as his parents have repeatedly tried to hide the eight-inch figure from him. Mr Barham, from Cannock, Staffordshire, was given the mini Father Christmas when he was two by his father Mick who won it in a pub raffle. And amazingly Mike's never had to change the batteries, even though the current two 1980s 'D' Maxell Super Power Ace Red have rusted solid into position. Mike, 32, who lives with Julie and their 15-month-old daughter Millie in Cannock, Staffs, is bringing out the decoration this year as he has for the past 29. He said: 'My mum and my partner hate it, when I was a kid mum used to hide it in the cooker or the fridge. 'My partner says it's got fleas. 'It moved out of home with me about seven years ago and it's usually in a box in the garage, I get it out about a week before Christmas. 'It's incredible to think he's still going after 30 years. My dad Mick won him in a raffle at a pub and I've had him ever since. 'Santa hasn't got a nickname or anything like that and the tune he plays now is a bit difficult to understand, but in battery years he must be an OAP by now.' Mike's never had to change the . batteries, even though the current two 1980s 'D' Maxell Super Power Ace . Red have rusted solid into position . Mike Barham when he was 6 years old with the Father Christmas decoration in the background to the right . | Engineers at Duke University have designed a breakthrough gadget that 'harvests' background microwave radiation and converts it into electricity, with the same efficiency as solar panels. The development, unveiled on Thursday, raises exciting possibilities such as recharging a phone wirelessly and providing power to remote locations that can't access conventional electricity. And the researchers say that their inexpensive invention is remarkably versatile. It could be used to capture 'lost' energy from a range of sources such as satellite transmissions, sound signals or Wi-Fi. The future: The device that is capable of harvesting microwave signals from the air consists of five fiberglass and copper conductors wired together on a circuit board . The Duke engineers used metamaterials, which their press release describes as 'engineered structures that can capture various forms of wave energy and tune them for useful applications.' They say the device harvested microwaves with an efficiency of 36.8 percent, similar to modern solar cells that capture light energy. A report that will appear in the journal Applied Physics Letters in December states that this invention is capable of converting microwave signals to enough direct current voltage to recharge a cell phone battery. The gadget, created by undergraduate engineering student Allen . Hawkes, graduate student Alexander Katko and lead . investigator Steven Cummer, consists of five fiberglass and copper conductors wired together on a circuit board. It is capable of providing 7.3V of electricity. As the press release points out, current USB chargers provide around 5V. Hawkes said: 'We were aiming for the highest . energy efficiency we could achieve. We had been getting energy . efficiency around 6 to 10 percent, but with this design we were able to . dramatically improve energy conversion to 37 percent, which is . comparable to what is achieved in solar cells.' Proud: Alexander Katko (left) and Allen Hawkes (right) pioneered the breakthrough. 'It's possible to use this design for a lot of different frequencies and types of energy, including vibration and sound energy harvesting,' said Katko . His colleague, Katko, added: 'It's possible to use this design for . a lot of different frequencies and types of energy, including vibration . and sound energy harvesting. 'Until now, a lot of work with . metamaterials has been theoretical. We are showing that with a little . work, these materials can be useful for consumer applications.' Possible uses for the new technology include building metamaterial into homes to ensure Wi-Fi signals are not just lost. Electrical products could also have a device attached to increase efficiency by ensuring that excess power is not wasted. In theory, the invention could also be used to beam signals from phone towers that could then be converted into electricity. Electronic devices could be recharged wirelessly or electricity sent to remote areas without power cables. Power: The device harvested microwaves with an efficiency of 36.8 percent, similar to the solar cells installed on this California home in a file photo . The researchers explained that a series of the power-harvesters could even capture signals from satellites passing overhead. This could allow for electricity in hostile environments such as mountaintops or deserts. Cummer said: 'Our work demonstrates a simple and inexpensive approach to electromagnetic power harvesting. 'The beauty of the design is that the basic building blocks are self-contained and additive. One can simply assemble more blocks to increase the scavenged power.' | eng_Latn | 5,151 |
What is the typical value of earthing resistance? | What is typical value of earthing resistance? | Can extremely low radio frequencies (ELF) pass through INTERPLANETARY and INTERSTELLAR medium? do some of them pass through it? | eng_Latn | 5,152 |
Why would a transmitter have additional adjustments? | Maximum power transfer requires matching the impedance of an antenna system (as seen looking into the transmission line) to the complex conjugate of the impedance of the receiver or transmitter. In the case of a transmitter, however, the desired matching impedance might not correspond to the dynamic output impedance of the transmitter as analyzed as a source impedance but rather the design value (typically 50 ohms) required for efficient and safe operation of the transmitting circuitry. The intended impedance is normally resistive but a transmitter (and some receivers) may have additional adjustments to cancel a certain amount of reactance in order to "tweak" the match. When a transmission line is used in between the antenna and the transmitter (or receiver) one generally would like an antenna system whose impedance is resistive and near the characteristic impedance of that transmission line in order to minimize the standing wave ratio (SWR) and the increase in transmission line losses it entails, in addition to supplying a good match at the transmitter or receiver itself. | When optimally designed within a given core saturation constraint and for a given active current (i.e., torque current), voltage, pole-pair number, excitation frequency (i.e., synchronous speed), and air-gap flux density, all categories of electric motors or generators will exhibit virtually the same maximum continuous shaft torque (i.e., operating torque) within a given air-gap area with winding slots and back-iron depth, which determines the physical size of electromagnetic core. Some applications require bursts of torque beyond the maximum operating torque, such as short bursts of torque to accelerate an electric vehicle from standstill. Always limited by magnetic core saturation or safe operating temperature rise and voltage, the capacity for torque bursts beyond the maximum operating torque differs significantly between categories of electric motors or generators. | eng_Latn | 5,153 |
From where is current to the motor supplied? | A commutator is a mechanism used to switch the input of most DC machines and certain AC machines consisting of slip ring segments insulated from each other and from the electric motor's shaft. The motor's armature current is supplied through the stationary brushes in contact with the revolving commutator, which causes required current reversal and applies power to the machine in an optimal manner as the rotor rotates from pole to pole. In absence of such current reversal, the motor would brake to a stop. In light of significant advances in the past few decades due to improved technologies in electronic controller, sensorless control, induction motor, and permanent magnet motor fields, electromechanically commutated motors are increasingly being displaced by externally commutated induction and permanent-magnet motors. | Unpopulated boards are usually bare-board tested for "shorts" and "opens". A short is a connection between two points that should not be connected. An open is a missing connection between points that should be connected. For high-volume production a fixture or a rigid needle adapter is used to make contact with copper lands on the board. Building the adapter is a significant fixed cost and is only economical for high-volume or high-value production. For small or medium volume production flying probe testers are used where test probes are moved over the board by an XY drive to make contact with the copper lands. The CAM system instructs the electrical tester to apply a voltage to each contact point as required and to check that this voltage appears on the appropriate contact points and only on these. | eng_Latn | 5,154 |
I'm covering my workbench with a ESD mat (3100x900mm.) I will also install 4 x ESD Sockets under the workbench (see below.) I will connect everything to an ESD EU plug: In the end the mat and sockets will both connect to EU ESD plug. My real question is if there's a problem with that connection. The ESD sockets already have 1Mohm and the EU plug have another 1Mohm, that connection will make a 2Mohm resistance. Plus if I use a wrist band with another 1Mohm resistor that result in a final 3Mohm to earth. Will that decrease the effectiveness, or will be just fine? Result: | I have a hard time finding a how-to. I would like to set up a simple ESD mat and wrist wrap, but I am not sure about is the the 1 MOhm resistor should be, if at all. Several options: 1 MOhm from ground outlet to the mat, wire from the common earthing on the mat to the wrist wrap. 1 MOhm from ground outlet to the mat, wire from another contact on the mat to the wrist wrap. 1 MOhm from ground outlet to the mat, 1 MOhm from the same mat contact to the wrist wrap. wire from ground outlet to the mat, 1 MOhm from the same mat contact to the wrist wrap. wire from ground outlet to the mat, wire from another mat contact to the wrist wrap. I am not sure why the 1 MOhm wire is needed since the mat itself already has that kind of resistance (as long as the wrist wrap does not connect to ground directly, but through the mat). Which solutions above are ok? Which is best? Should I do something else instead? | I have a hard time finding a how-to. I would like to set up a simple ESD mat and wrist wrap, but I am not sure about is the the 1 MOhm resistor should be, if at all. Several options: 1 MOhm from ground outlet to the mat, wire from the common earthing on the mat to the wrist wrap. 1 MOhm from ground outlet to the mat, wire from another contact on the mat to the wrist wrap. 1 MOhm from ground outlet to the mat, 1 MOhm from the same mat contact to the wrist wrap. wire from ground outlet to the mat, 1 MOhm from the same mat contact to the wrist wrap. wire from ground outlet to the mat, wire from another mat contact to the wrist wrap. I am not sure why the 1 MOhm wire is needed since the mat itself already has that kind of resistance (as long as the wrist wrap does not connect to ground directly, but through the mat). Which solutions above are ok? Which is best? Should I do something else instead? | eng_Latn | 5,155 |
What can happen to capacitors used in high current applications? | Capacitors may catastrophically fail when subjected to voltages or currents beyond their rating, or as they reach their normal end of life. Dielectric or metal interconnection failures may create arcing that vaporizes the dielectric fluid, resulting in case bulging, rupture, or even an explosion. Capacitors used in RF or sustained high-current applications can overheat, especially in the center of the capacitor rolls. Capacitors used within high-energy capacitor banks can violently explode when a short in one capacitor causes sudden dumping of energy stored in the rest of the bank into the failing unit. High voltage vacuum capacitors can generate soft X-rays even during normal operation. Proper containment, fusing, and preventive maintenance can help to minimize these hazards. | Many assembled PCBs are static sensitive, and therefore must be placed in antistatic bags during transport. When handling these boards, the user must be grounded (earthed). Improper handling techniques might transmit an accumulated static charge through the board, damaging or destroying components. Even bare boards are sometimes static sensitive. Traces have become so fine that it's quite possible to blow an etch off the board (or change its characteristics) with a static charge. This is especially true on non-traditional PCBs such as MCMs and microwave PCBs. | eng_Latn | 5,156 |
How do I determine if my laptop battery driver is bad, or if I have a bad battery? Battery will not charge at all. Read somwhere that it could be the battery driver, but I don't know how to assess that. Any help appreciated. | Is there any utility to check whether my laptop battery is in healthy condition or not? Is there any utility available on Ubuntu to check whether laptop battery is in healthy condition or not? | How does the tester screwdriver work? How does the tester screwdriver work? If I put the tester screwdriver inside the "hot wire" of an electrical socket, it lits up if I press my finger against the metal cap on top of the screwdriver. This happens also if I stand on a surface of isolating material, such as wood. I read elsewhere that this happens due to stray capacitance formed by the "hot wire", the human body, and the ground. One has $$ Z = R + \dfrac{1}{j \omega C} $$ for the impedance, so if C is high enough, the impedance should be close to r , the "effective resistance" of the formed circuit. Here I get lost; why r is small enough to cause a current in the range of mA even if I stand on an isolating surface? So really what I am asking is how one may represent the system hot wire - screwdriver - human body - wooden floor - building - ground as an electrical circuit, and which parts of the physical system contribute to the resistance, capacitance (and inductance?) and in which proportion, even very approximately. | eng_Latn | 5,157 |
Choose a Surge Protector | Power surges can potentially damage electronic devices if not adequately protected. Surge protectors provide protection against power surges, which are an electrical power spike that can burn up the electrical circuits within electronics and appliances in addition to damaging electrical outlets and light switches throughout your home. | Turn your last breath of oxygen into minutes for Escape and Rescue... | eng_Latn | 5,158 |
MTG - Cards that share names stack abilities? Ability: When enters the battlefield you get {E}{E}. Does this mean if I already have one aether poisoner on the field and I play a second that the ability will stack and I'll get {E}{E}{E}{E}? If the answer to the previous question in yes, then consider the following: {U}: gains flying until end of turn. Does this mean that if I have 2 Dukhara peafowls I merely have to pay {U} once in order to give both flying? | Identical creatures entering the battlefield If I have two cards called in hand and I play my first, Sin Collector (A). I use its triggered ability. "When Sin Collector enters the battlefield, target opponent reveals his or her hand. You choose an instant or sorcery card from it and exile that card." Now, I play Sin Collector (B), I use B's triggered ability. But now my question. Does Sin Collector (A)'s ability trigger again as well? 'Sin Collector' entered the battlefield again, right? | Can a bird, previously at earth potential, get electrocuted by landing on a powerline at high-enough voltage due to the initial "equalization charge"? At the voltage levels of typical overhead transmission lines in the US, a bird can land on one and be just fine (as long as it doesn't do something like spread its wings and touch a tree or something else at lower electric potential). However, what about a hypothetical powerline at much higher voltage (as in tens of megavolts). Could landing on such a powerline fatally-shock the bird even though it does not complete a circuit for sustained current? (Assume that the distance is long enough that electrical arc'ing is impossible.) NOTE: My understanding of what happens when a bird flies from an earth object to a powerline (please correct me if I'm wrong) is that - upon contacting the wire - its electric potential changes from earth-potential to the powerline's potential. In order for this to happen, there is an initial transfer of electrical energy (i.e. flow of charge i.e. current) from the powerline to the bird which "equalizes" their electric potential, which happens nearly instantaneously. If this is correct, then my question can be restated more generally as "Can an 'equalization charge' such as this result in a fatal shock, if the potential difference that it's equalizing is high enough?" | eng_Latn | 5,159 |
What happens to electromagnetic field when crossing event horizon | What do you feel when crossing the event horizon? | Why can two (or more) electric field lines never cross? | eng_Latn | 5,160 |
Parallel Capacitor Conundrum I have recently taken on a project that involves improving a circuit and there is a couple of instances where there are two capacitors in parallel with each other. The values of these capacitors are 100nF and 100pF so one is average sized while the other is small. The instances of these capacitors in parallel are placed on input/output signals, one on an output that is readings a battery voltage and the other on a power input to an op-amp. I am a bit confused as to why they are both needed as opposed to one so if anyone can point me in the right direction with regards to that, that would be great. | What's the use of a decoupling capacitor near a reservoir capacitor? I've seen some circuits where a decoupling capacitor is used as well as a reservoir capacitor, like this (C4 and C5): I've read about and for me it looks as if they are meant to remove small fluctuations in the supply voltage. Then I thought - wasn't that the purpose of a as well? Why wouldn't the reservoir capacitor be able to filter out the small fluctuations, if it is able to filter out the large fluctuations? So I feel like I have a basic misunderstanding here. What is the purpose of a decoupling capacitor next to a reservoir capacitor, when we assume we place both equally near to the power consuming part? Or is the only advantage of the decoupling capacitor that it is smaller and can therefore be easily placed more near to the power consuming part? | Socket Tester all indicators light up I used the above GFCI/RCD (up to 250v) socket tester on the 240v black and red live wire of the US split phase ac power system. When I connect the ground, all indicator lights (3 red) got on indicating "Live/Grd Reverse, Missing GRD" although it is connected properly. What is inside the socket tester? Does it have a live and neutral leg such that it should only be used for ac system with polarity? How about if you use it on the red and black 240v phase to phase? Why would all the indicators light become on (3 red lights)? The following is the specs of it: Specifications: Brand Name: HABOTEST Color: Black Material: Flame Retardant ABS Plug Type: US Voltage: 48V-250V 45-65Hz RCD Test: >30mA (EU/UK Plug) RCD Working Voltage: 220V±20V GFCI Test: >5mA (US Plug) GFCI Working Voltage: 110V±20V Voltage Measurement: 48V~250V / 45~65Hz Accuracy: ±(2.0%+2) Working Environment: 0°C ~ 40°C, 20% ~75%RH Storage Environment: -10°C ~ 50°C, 20% ~80%RH Safety Rating: EN61010-1,-2-030, EN61326-1,CAT II 300V Item Size: 62 * 65 * 55mm / 2.4 * 2.6 * 2.2in Item Weight: UK 64g/2.3oz, EU 59g/2.1oz, US 53g / 1.9oz Package Size: 7.5 * 7.4 * 7.3cm / 3.0 * 2.9 * 2.9in Package Weight: UK 90g/3.2oz, EU 86g/3.0oz, US 79g / 2.8oz | eng_Latn | 5,161 |
Installing electrical box in 2x4 I'm designing a custom headboard for our bed and I want to install electrical into the cubbies I am making in the headboard (primarily for cell phone charging). In my current design, the electrical box would be installed into a cut out 2x4. I've attached two sketchup models for reference. My primary question is this: Are there any U.S. electrical codes or even best practices I need to be aware of in regards to where and into what material I can install an electrical box? The only thing I could find was that a box can protrude through up to 1/2" of drywall, so I'm wondering if that means that attempting to protrude through a larger (flammable) piece of material like this is against code. If you have any other related advice/caution about running electrical into furniture, that would be welcomed as well. Thanks! EDIT: In my design, this 2x4 could be changed to a different material, but initially I was trying to keep the structure to 2x4s and plywood for simplicity. I could switch to a thinner material if that would help me to be in compliance. , | How to add electrical fixtures to (custom) furniture? Having electrical outlets, USB charging ports, night lights, etc would be nice to have on some pieces of furniture, like side tables. Several receptacle manufacturers make combination fixtures with USB and power, for instance, or power plus a night light. I've thought about nailing an electrical box to a (hidden) portion of the table and putting one of those receptacles in it, but what things do I need to consider doing this? Is it as simple as it sounds, and then just fashioning some kind of plug out of 12/2 or 14/2 wire? Does the answer change if the box is concealed (though still accessible) vs it being completely visible? | Socket Tester all indicators light up I used the above GFCI/RCD (up to 250v) socket tester on the 240v black and red live wire of the US split phase ac power system. When I connect the ground, all indicator lights (3 red) got on indicating "Live/Grd Reverse, Missing GRD" although it is connected properly. What is inside the socket tester? Does it have a live and neutral leg such that it should only be used for ac system with polarity? How about if you use it on the red and black 240v phase to phase? Why would all the indicators light become on (3 red lights)? The following is the specs of it: Specifications: Brand Name: HABOTEST Color: Black Material: Flame Retardant ABS Plug Type: US Voltage: 48V-250V 45-65Hz RCD Test: >30mA (EU/UK Plug) RCD Working Voltage: 220V±20V GFCI Test: >5mA (US Plug) GFCI Working Voltage: 110V±20V Voltage Measurement: 48V~250V / 45~65Hz Accuracy: ±(2.0%+2) Working Environment: 0°C ~ 40°C, 20% ~75%RH Storage Environment: -10°C ~ 50°C, 20% ~80%RH Safety Rating: EN61010-1,-2-030, EN61326-1,CAT II 300V Item Size: 62 * 65 * 55mm / 2.4 * 2.6 * 2.2in Item Weight: UK 64g/2.3oz, EU 59g/2.1oz, US 53g / 1.9oz Package Size: 7.5 * 7.4 * 7.3cm / 3.0 * 2.9 * 2.9in Package Weight: UK 90g/3.2oz, EU 86g/3.0oz, US 79g / 2.8oz | eng_Latn | 5,162 |
Will debugging damage my battery? I work as a Android developer and I use my own phone for debugging as well as some other devices. Keeping the phone connected with USB will automatically charge my phone but will my battery be damaged by being connected 8~ hours at night and 8~ hours at work every day? | Does constant charging harm my Android cellphone? I usually disconnect my cellphone from the charger some time after it's fully charged because I'm afraid the battery could lose capacity over time if I don't. However, I believe modern electronics should be able to handle this kind of scenario and automatically stop charging the battery once it's full. Does this apply to modern Android phones? Or do I need to continue disconnecting it all the time? | How does the tester screwdriver work? How does the tester screwdriver work? If I put the tester screwdriver inside the "hot wire" of an electrical socket, it lits up if I press my finger against the metal cap on top of the screwdriver. This happens also if I stand on a surface of isolating material, such as wood. I read elsewhere that this happens due to stray capacitance formed by the "hot wire", the human body, and the ground. One has $$ Z = R + \dfrac{1}{j \omega C} $$ for the impedance, so if C is high enough, the impedance should be close to r , the "effective resistance" of the formed circuit. Here I get lost; why r is small enough to cause a current in the range of mA even if I stand on an isolating surface? So really what I am asking is how one may represent the system hot wire - screwdriver - human body - wooden floor - building - ground as an electrical circuit, and which parts of the physical system contribute to the resistance, capacitance (and inductance?) and in which proportion, even very approximately. | eng_Latn | 5,163 |
what does electromagnetic mean? | Electromagnetic is a term that refers to electric and magnetic fields. Since they are actually one and the same thing, they are collectively called electromagnetic. | Edison Carter was one of the main characters in the science fiction television series Max Headroom. A hard-hitting reporter for Network 23, he sometimes came close to uncovering things that his superiors in the network would've preferred to keep private. Eventually, one of these instances required him to flee his workspace, and an accident in so doing caused him to become injured, upon which his brain was downloaded, giving birth to the character Max Headroom._______Oops,must have both copied and pasted from the same site. | eng_Latn | 5,164 |
How long could you survive in Space without a Spacesuit? Contrary to popular belief, and numerous Hollywood movies, you could survive unprotected in space for over a minute - provided you could get back to medical care immediately after. Moreover, in movies we see astronauts and people in spaceships opening doors and closing them again with no suits on. Are these things correct or just myths? Is there any way to estimate or predict the time for the above? | How does space affect the human body (no space suit, no space craft) How does "outer space" affect the human body? Some movies show it as the body exploding, imploding or even freezing solid. I know space is essentially a vacuum with 0 pressure and the dispersion of energy makes it very cold. So are the predictions above accurate? | How can I safely prototype a mains power circuit? I'm building a device that has a mains power component, which I need to prototype before building to make sure everything works. I know I need to make sure wiring—and insulation!—is thick enough to cope with the higher current, and that I need to make sure there's enough space between exposed components so there's no arcing. I'll also be stashing whatever I prototype in a nice, insulated box before applying power, and I'll be include a small-value (250mA) fuse just in case. I'll be considering everything double-insulated rather than earthed (plastic enclosure, and there's nothing I'll need to touch while it's operating). My plan is to solder (through-hole) components directly to each other, then insulate everything (with heatshrink tubing or electrical tape) as much as possible, then use screw-type cable joiners to connect the power cable. I know I can't use traditional prototyping tools such as breadboards and stripboard for mains voltages, but what can I use to make prototyping at mains voltages easier? (To be clear, 'mains voltage' in my area means 230V AC +10/-6% at 50Hz; GPOs are generally rated at 10A.) | eng_Latn | 5,165 |
Survive an EMP | An Electromagnetic Pulse, or EMP, is a sudden burst of electromagnetic radiation. The sudden change in energy levels can, and will, literally fry electrical circuits of computers, cars and other electrical appliances. | Even if you can't wait to live in your new house, curb your enthusiasm and resist the urge to cram all your possessions any which way into boxes. | war_Latn | 5,166 |
That is the question that I am asking you today. | staying inside a 'Faraday Cage' is a good first step. Look up Faraday Cage in Wikipedia | great...now that song will be in my head all day long! | eng_Latn | 5,167 |
more relations between grid system and atmospheric discharges | Other than direct discharges from lightning, fluctuations in the magnetic field can generate currents in the electrical grid. This happens as a result of solar activity such as solar wind and flares bombarding the Earth's magnetic field causing it to flex.\n\nLong distance transmission lines are especially vulnerable to this as their length is enough to act as a generator from the magnetic changes. Grids can shut down and transformers have been melted due to power surges generated by strong solar storms. | Let's see:\nThe triboelectric effect is only related to friction because they both involve adhesion. However, the effect is greatly enhanced by rubbing the materials together, as they touch and separate many times to create an electric charge.\n\nSo, yes. | eng_Latn | 5,168 |
that from high-voltage power transmission lines? | Nonionizing radiation is electromagnetic radiation that includes: \n\nRadio waves \nMicrowaves \nInfrared light \nVisible light \nHazards of Nonionizing Radiation\n\nUnlike ionizing radiation, nonionizing radiation does not have enough photon energy to remove an electron from an atom. However, it can still be hazardous. For example: \n\nPowerful industrial lasers, which emit tightly focused or coherent beams of visible light, can burn through human tissue and even metal. \nSome nonionizing radiation can interfere with the operation of heart pacemakers and other medical devices, as well as critical equipment in aircraft. \nHigh levels of radio frequency and microwave radiation can heat tissue and if the temperature increase is high enough, can adversely affect health. \nElectric and Magnetic Fields\nExtremely low-frequency electric and magnetic fields (EMFs) surround electrical machinery, home appliances, electric wiring, and high-voltage electrical transmission lines and transformers. (Figure 11) \n\nA good deal of public and government attention has been focused in recent years on the possible health effects of EMFs. The public is exposed to these fields through the generation, transmission, and use of electric power. The National Institute of Environmental Health Sciences (NIEHS), a branch of the National Institutes of Health (NIH), has compiled information on this issue. (You can get more information on this and other issues from the NIEHS Web site http://www.niehs.nih.gov/emfrapid) \n\nHigh-voltage power transmission and distribution lines have been a major focus of concern. Alternating-current (AC) electricity, with a frequency of 60 cycles per second, falls into the extremely low frequency range on the electromagnetic spectrum and thus has far too little energy to cause ionization. \n\nHowever, AC electric and magnetic fields can induce electric currents in conducting materials, including human and animal tissue. (Direct-current fields, such as the Earth's magnetic field, do not have this effect). The electric current induced in our bodies may have potential biological and health effects. \n\nEvidence of health effects from EMF is inconclusive, although some studies have indicated a possible link between EMFs and childhood leukemia and other forms of cancer. The information available, however, is not sufficient to establish a cause-effect relationship. \n\nSome studies have reported the possibility of increased cancer risks, especially leukemia and brain cancer, for electrical workers and others whose jobs require them to be around electrical equipment. Additional risk factors, however, such as exposure to cancer-initiating agents, may also be involved. \n\nSome researchers have looked at possible associations between EMF exposure and breast cancer, miscarriages, depression, suicides, Alzheimer's disease, and Amyotrophic Lateral Sclerosis (ALS, or Lou Gehrig's Disease), but the general scientific consensus is that the evidence is not yet conclusive. \n\nIn June of 1998, a special review panel convened by the NIEHS reviewed EMF health studies. A majority of the panel found "limited evidence that residential exposure to extremely low frequency magnetic fields may increase the risk of childhood leukemia." A majority also found limited evidence that workplace exposure to EMFs may cause chronic lymphocytic leukemia in adults. \n\nAccording to NIEHS, "the probability that EMF exposure is truly a health hazard is currently small. The weak epidemiological associations and lack of any laboratory support for these associations provide only marginal scientific support that exposure to this agent is causing any degree of harm." The NIEHS did conclude, however, in its 1999 Report to Congress, that extremely-low-frequency EMF exposure cannot be recognized as entirely safe because of weak scientific evidence that exposure may pose a leukemia hazard; the associations reported for childhood leukemia and ad | get rid of the carpet? cover the metal? wear antishock bracelets? find some way to nuetralize yourself when you enter? | eng_Latn | 5,169 |
what is positive and what is negative?\nwhether positive carries positive current?,negative carries negative current.?\nThen What is positive current what is negative current?\nwhether if we touch positive current what happen?\nwhether if we touch negative current what happen? | AC stand for alternating current. AC current can oscillate at whatever frequency (# times per second, usually expressed in Hertz, Hz) you want it to. However, the power that comes into your house oscillates at 60 in the US and 50 in Europe. This has to do with the development of electricity. They had to sync up the phases when they created it and they would do this by hooking up the two sources to lightbulbs that would flash at each peak. 50 or 60 times a second is about the maximum cycle rate visible by the human eye.\n\nPositive and negative current denote which direction electrons are flowing.\n\nNothing will happen if you touch positive or negative current, just don't touch both at the same time. | The only reason you get shocked when you touch one phase and ground in the commercial power distribution system is because the commercial power distribution system uses a grounded system where the earth itself is used instead of a wire. Commercial power distribution I believe (and I may be wrong on this) uses Wye (pronounced "Y") connected three phase power with the center grounded allowing the earth itself to be used in place of the fourth wire. In a balanced 3-phase system (all loads draw the same amount of power from all three phases) the center is not required, but few people have three phase blenders, so only a single phase of the power is sent to an outlet along with the neutral which is grounded. If you look at Naval electrical distribution systems, they are ungrounded. Navy schools teach that the use of an ungrounded system raises reliability because two faults to ground on two different phases are required to disable the electrical distribution system, and that in ideal conditions one can touch a single phase and ground and not be shocked. Berkeley challenges this and I have included a link to their web sight. I believe the truth is somewhere in the middle because I have touched a single phase and ground and been shocked. It was a 440V wire, and I definitely felt it, but it was not nearly as sever as being shocked by an outlet (115V) so ungrounded reduced the severity, but did not eliminate the shock. The electricity that I felt was probably from capacitance in the insulation. To any one who cares, I managed to shock myself while removing a dead front fuse. Dead front fuses are "idiot proof", but you know what happens every time they make something that is "idiot proof"? They make a better idiot to go with it. (: | eng_Latn | 5,170 |
Why can't two electrical field lines intersect each other? | Why can two (or more) electric field lines never cross? | What happens when identical overlapping effects have their end-condition met? | eng_Latn | 5,171 |
Do supply lines work together? | What, exactly, is transferred along supply lines? | Why can two (or more) electric field lines never cross? | eng_Latn | 5,172 |
if i put a live wire with high voltage current running through it in the ocean, would it electrocute the world | Yeah, okay. So it works like this, \n\nYou get a shock when you touch a live wire, or, say, a charged conductor (like a sister rubbing her rubber soled slippers on the carpet) because that conductor has an excess of electrons. These electrons (the electrical charge) are trying to get to the ground (you can think of the earth as the largest conductor around, it is therefore the best place for extra electrons to be, energetically speaking).\n\nSo if you stick a live wire into the ocean (the salt water is a good conductor) but it is so vast that the electrons will spread incredibly fast (going to the ground in every conceivable direction) so the charge will become really small really quickly.\n\nSo basically, if you're standing near where you stick the wire in, you'd be luck to electrocute yourself. Though I wouldn't recommend trying. | yeah , first thing kill the dumbos who preach to the third world countries the birth control is wrong.Not one person is left out? Hoohoo Dodo, how we gonna feed the personell the military has right now? Great idea ,really great feed africa , let americans starve. Heres one from me "STOP SMOING DOPE" THE ATTACKS ON 9/11 COULD HAVE BEEN PREVENTED WITH WITH ARMED SECURITY ON FLIGHT, | eng_Latn | 5,173 |
Hi i am wondering how you go about testing a lightning protection system. I know i can test the system if i have 230volts and an electrical loop impedance tester, but how do i test it if i don't have any mains power and i think a generators voltge would be to unstable.\n\nany help would be much appreciated\ncheers!!! | As a rough test use a megger to test resistance from lightning rod(s) to an independent earth spike. | Is this in state court or in federal court? In state court, the Iowa sentencing scheme is "indeterminent," meaning, that execpt for low-level crimes where a sentence is for less than a year, the court sentences only to a range of punishments; the parole board determines your actual release date based on individual factors. You can find the range in the Iowa Statutes\nIowa Code section 902.9 (general)\nIf you have a particular offense or charge, you can look that up in the Iowa Code as well.\n\nIf the sentence is federal -- i.e. in United States District Court, that sentence is covered by the Federal Sentencing Guidelines. It's a complicated manual with additions for aggravating "factors" and deductions for mitigating factors, and then you get a number for the offense level, and a roman numeral for your criminal history, and that results in a range. You can find more about that at the U.S. Sentencing Commission's website:\nhttp://www.ussc.gov/ | eng_Latn | 5,174 |
Hardware Trojan detection using path delay fingerprint | Differential Power Analysis | High-resolution pulsed electro-acoustic (HR PEA) measurement of space charge in outer space dielectric materials | eng_Latn | 5,175 |
them refers to good conductor and dielectrics.\nthanks in advance for your answers. | The earth is actually, as a whole, a conductor, mostly because there's a lot of earth to be a source and sink of charge. That's why many high power appliances have a third prong to plug into the wall called a "ground" (the round one below the the two flat prongs). That does actually connect into the earth. That way, if there is a malfunction, the current flows done to the earth, rather than you (which generally is not fun).\n\nIf the earth were a dielectric, current wouldn't flow at all to the earth, and so the current would have to flow somewhere else (possibly you). | Slang words are nothing new. There have always been slang or vulgar words. (the word vulgar originally referred to the language of the "commoners," common people.) I do honestly believe that most men behave decently. It's only the few who don't that you hear about. | eng_Latn | 5,176 |
ralted to electricity | Electric Discharge Machine | As a rough test use a megger to test resistance from lightning rod(s) to an independent earth spike. | eng_Latn | 5,177 |
Sampled values packet loss impact on IEC 61850 distance relay performance | Teaching Distance Relay using Matlab/Simulink Graphical user Interface | The Testing Effect Is Alive and Well with Complex Materials | eng_Latn | 5,178 |
PowerHammer: Exfiltrating Data From Air-Gapped Computers Through Power Lines | Power line communication in IoT-systems | The EM Side-Channel(s) | kor_Hang | 5,179 |
breaking keeloq in a flash ⋆ - . | Differential Power Analysis | Electromagnetic Analysis: Concrete Results | eng_Latn | 5,180 |
hello...Can u describe your understanding about role of elektromagnetic play in science and technology..? | Electromagnetism is the what allows information contained in electric circuits to actually leave the circuits. Althought he technique by which the information (electric signal) actually leaves the circuit is quite complicated, suffice it to say, that using an antenna, this information can be allowed to travel through air.\nCo-incidentally, even light happens to be an electromagntetic wave. So, you can say that human beings owe their vision to electromagnetism.\n\nMircowaves - an electromagnetic phenomenon allow you to exhange information with satellites, besides of course, allowing you to cook food.\n\nThink about it! Radio, Mobile phone communication etc. all owes its existence to electromagnetism.\n\nThis is course is with respect to electromagnetic wave phenomeona. When you actually think about the fact that one can create artificial magnetics using electric current, the possibilities are limitless | Actually what you want to build is an electric *motor*, not an electric *engine*. By definition, an engine has a number of working parts that move sychronously, whereas a motor is a simple moving machine (my English teacher nailed me on this back in the 12th grade and I've never forgotten it).\n\nBut nevermind all that semantics stuff. See the link below for some excellent how-to examples, depending on how powerful a motor you want to make.\n\nHave fun! | eng_Latn | 5,181 |
What are Michael Faraday's major findings on candles? | If by candles you mean light, He did experiments on whether or not magnetic fields could influence light. He discovered it did, but only with led glass not flint, rock crysal or calcareous spar. He is quoted as saying "Thus magnetic force and light were proved to have relation to each othere. This fact will likely prove exceeingly fertile and of great value in the investigation of both conditions of natural force." The Faraday Effect. | It's a lie, it's like cell phones causing gas stations to blow up. I work for a package delievery service and we ship optic mice, cell phones and what not all the time, and if something edmits radioactivity it's required to be labeled, even if it doesn't emit the radiation when it's turned off. the only thing you have in ur home that is slightly radioactive is ur smoke detectors.which are class 1, meaning as long as u dont eat them you'll be fine | eng_Latn | 5,182 |
mathematical proof of the existence of static electricity? | 2*(feet + carpet)*shuffling = ZAP! | So you are doing some numerical analysis... if you have a spreadsheet program you can use that. Use the trapezoid rule or Simpson's rule for some small increment in x. Your spreadsheet program is able to evaluate arctan. The second question can be evaluated with Newton's method. | eng_Latn | 5,183 |
Does anyone know any details about the Electromagnetic Bomb? | An electromagnetic bomb or E-bomb is a weapon designed to disable electronics on a wide scale with an electromagnetic pulse. The electromagnetic pulse was first observed during high altitude nuclear weapon detonations. An electromatic pulse lasts for less than a nanosecond, and travels outward in every direction as an electromagnetic shock wave.This shock wave will induce heavy currents in all electronic gadgets that mainly contain semiconducting and conducting materials.This produces immense heat that simply fries the circuitry inside and destroys them. As such, while not being directly responsible for the loss of lives, these weapons are capable of disabling electronic systems on which industrialized nations are highly dependent.\n\nElectromagnetic weapons are still mostly classified and research surrounding them is highly secretive. It is generally thought that E-bombs use explosively pumped flux compression generator technology as their power source. | Yeah when i was 18. She was i rite nutjob!!! E-mail me if u want & i'll tell u a bit more. | eng_Latn | 5,184 |
The Ferranti effect is when the receiving end voltage is larger than the sending end voltage. How can you do that? What is the explanation for this? | Why does the Ferranti effect increase the receiving end voltage when compared with the sending end voltage? | Why do we use high voltage to transmit electrical power? | eng_Latn | 5,185 |
What IS the REASON WHY BIRDS are NOT ELECTROCUTED ON POWER LINES? | Why don't birds get electrocuted sitting on power lines? | Do batteries run out even if they are not being used? | yue_Hant | 5,186 |
Comparing static bug finders and statistical prediction | Using Static Analysis to Find Bugs | SPICE Models to Analyze Radiated and Conducted Susceptibilities of Shielded Coaxial Cables | eng_Latn | 5,187 |
IEC 61850 Standard Based MMS Communication Stack Design Using OOP | Substation automation system using IEC 61850 | iec 61850 communication networks and systems in substations : an overview for users . | kor_Hang | 5,188 |
Modelling and Simulation of Electric Vehicle Fast Charging Stations Driven by High Speed Railway Systems | system design for a solar powered electric vehicle charging station for workplaces q . | Physical Activity Over the Life Course and Its Association with Cognitive Performance and Impairment in Old Age | eng_Latn | 5,189 |
Estimation of receivable distance for radiated disturbance containing information signal from information technology equipment | Compromising Emanations: Eavesdropping Risks of Computer Displays | Examining smart-card security under the threat of power analysis attacks | eng_Latn | 5,190 |
How can I survive EMP attack? | How can I survive from an EMP attack to the grid? | How is it living off the grid in India ? | eng_Latn | 5,191 |
Substation automation system using IEC 61850 | Object Modeling of Data and DataSets in the International Standard IEC 61850 | Exploiting partially overlapping channels in wireless networks: turning a peril into an advantage | eng_Latn | 5,192 |
plug - in hybrid electric vehicles and smart grid investigations based on a microsimulation . | vehicle - to - grid power fundamentals : calculating capacity and net revenue . | Bone extraction in X-ray images by analysis of line fluctuations | eng_Latn | 5,193 |
how does the static switch work in a ups | The diagram in Figure 2 shows a static bypass switch connected across a UPS. The UPS. could be a double conversion or a delta conversion or rotary type. The static bypass switch. provides a means to accomplish high-speed transfer to the bypass path in case of UPS. | An electrician simply installs a new circuit breaker in the circuit breaker panel and runs a new wire to either a new or existing AC receptacle. When a UPS is used with the critical load, the voltage regulation and circuit breaker tripping prevention features of the dedicated line are rendered unnecessary. | eng_Latn | 5,194 |
what color are ups protected outlets? | NEMA Blue Receptacles. Hubbell Blue NEMA Receptacles. Outlets are Simplex which is a single receptacle for a one gang box. There is a developing installation standard using Blue Color receptacles to Identify UPS supported outlets. Typically only critical equipment receptacles are wired to a UPS supported circuit. With the same colored receptacles it becomes difficult to ID a protected outlet as space is re-appropriated. | Artwork: Left artwork: Without a surge protector, the hot/live (brown) and neutral (blue) connections provide power to your appliance. The ground (green) connection is typically wired to the metal case to provide a safe way for stray currents to escape, but it's not involved in powering the appliance. | eng_Latn | 5,195 |
what is an electrical contactor | A contactor is an electrically controlled switch used for switching an electrical power circuit, similar to a relay except with higher current ratings. A contactor is controlled by a circuit which has a much lower power level than the switched circuit.Contactors come in many forms with varying capacities and features.Unlike a circuit breaker, a contactor is not intended to interrupt a short circuit current. Contactors range from those having a breaking current of several amperes to thousands of amperes and 24 V DC to many kilovolts. contactor is controlled by a circuit which has a much lower power level than the switched circuit. Contactors come in many forms with varying capacities and features. | Control Circuits for Air Conditioning & Heating - How It All Works. The relay or contactor is nothing more than a switch that turns on a motor or compressor. It works through the 24-volt control circuit. Some relays are controlled by other relays depending on the components in the system and the sequence of operation. | eng_Latn | 5,196 |
what protects house from electromagnetic field? | How can you best protect yourself and your loved ones from unwanted electromagnetic fields? As people spend over half of their time at home, this is where you may absorb more electromagnetic radiation than anywhere else. So for best EMF protection, make your home a low-EMF zone. Most of the EMF that people experience at home does NOT come from external sources (power lines, electrical sub-stations, cell phone towers and suchlike) but from electrical equipment and radio transmitting devices INSIDE their home. | Electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials.hielding is typically applied to enclosures to isolate electrical devices from the 'outside world', and to cables to isolate wires from the environment through which the cable runs. Electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as RF shielding. | eng_Latn | 5,197 |
definition of photoelectric converters | Photoelectric Isolation Interface Converter can provide 1000W lightning strike and surge protection power on each line. The rapid Transient Voltage Suppressor (TVS) can effectively inhibit lightning and ESD. GC-ATC-107N interface converter DB9 pin PIN5 is designed for surge grounding protection. The user shall try to avoid | by Gil Knier. Photovoltaics is the direct conversion of light into electricity at the atomic level. Some materials exhibit a property known as the photoelectric effect that causes them to absorb photons of light and release electrons. | eng_Latn | 5,198 |
why do surge protectors go bad | But the reason they go bad has more to do with their environment than with their age. The protective components inside surge protectors work by either absorbing over-voltage spikes outright or shunting them to ground. This keeps the amount of over-voltage reaching your device(s) to a minimum. | When a surge moves through the electrical circuit in a house or building, the surge protector diverts the energy away from connected electronic devices. Itâs important to understand that not all power strips offer surge protection. | eng_Latn | 5,199 |
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