Engineering

Dear electician friends, Suppose I have got two horizontal ground grids laid at the same depth and separated by a distance "d". How to calculate "d" so that my grids are independant from each other, meaning that I can bond them together and calculate an equivalent resistance by 1/(1/R1+1/R2) ? With my thanks !

Hello everyone, I was reading about these engines, and I through they were really interesting. I was wondering about a few things, and I'm hoping you guys can answer a few questions. I watched the video from ted ed about the future of space craft, and they had a short explanation of the way it worked. I looked at some diagrams on it later, and found that they're nothing liked the one the ted video showed. Now I understand that they simplified it extremely much, but does the ted video show the basics? I won't post the link, but you can look of up: "the future of spacecraft" ted ed. My questions are: How accurate is the diagram on the ted video? How is the …

Hi guys I am really, really struggling to find the full saturated B-H curves for different ferromagnetic materials. So far the only data I have been able to find is third quadrant magnetization curves or normal (virgin) magnetization curves. Looking for something in an excel table, but I can also make due with pics if that is the only option. The reason I need this is to match a hysteresis simulation to some measured results. CK

What is the refractive index of LiLaTiO3 (Lithium Lanthanum Titanium Oxide)? This is the target material for 2 inch wafer deposition.

ok my main points come from the anime sword art online and in it the helmets use magnetic fields to read the players mind that will be very difficult along with that they have the ability to add a pain level as how much pain will the person feel so leaving the senses of touch taste and smell. Now we already are able to do the sense of sight with a 360 degree screen right in the helmet like any movie watching glasses now the most difficult part will be the motion but for that i have an idea what about if we are able to read all the motor functions send by the brain or the spinal cord and stop them as well as read and implement them into the system as motor functions for …

Lets forget the intro and lets get to the point. What is required in order to walk/run in the surfice of the water? Speed? density? I remenber there is a specie of lizard that have the ability to walk on the water, so my question is how? and could we also do be able to do it?

[it was a toss-up between "Engineering" and "Other Sciences" since there's no section for "Technologies."] There is exactly one optimal technology whose development would be most beneficial to humanity at this stage of history--the display technology of the original Kindle Reader. It uses ink-to-paper-like engineering instead of artificial lighting. I am convinced that the only restraining force from our developing this technology to maturity is the cost, with reckless disregard to cost-benefit. Over the short-term, businesses will generate more lucre mass producing video or visual display units that project light, rather than investing over the long-term to develo…

Say you live out in the country, with plenty of acreage. Is it worth building your own wind turbine, say 75 ft in height, that is capable of powering your house for a few hours a day? Not necessarily the only power source, but something to reduce energy bills over a year. ~EE

Assume we adapted our interstellar space ship to use a maglev propulsion system (like those used for high speed trains) only over tracks surrounded by a sealed tube in order to create a perfect vacuum so that we travel in a frictionless state. Assume ideal tracks that encircle the Earth at the equator and are always perfectly level and straight. Wouldn't supplying a steady state power supply create a steady state acceleration given the frictionless state? Theoretically, what prevents us from accelerating the ship to close to light speed over a period of years before releasing the ship to coast towards a destination star system light years away at say, *22% of…

My son is an awful eater. I need to get him to eat something somewhat healthy for school lunch. I want to pack him a grilled cheese sandwich or chicken nuggets in a container without them getting all moist and gross. I was thinking maybe a container that will let me pump the air out of it once it's sealed could work or I was thinking at wrapping some Molecular Sieve to the lid on the inside of the container to absorb the moisture. Do es anybody think this will work and if not does anybody have an idea?

Hi, So I'm a computer scientist with no real background in molecular physics or anything of that sort but I think the science community is really dragging their feet on fusion for some reason. I go look at experiments done in the 90s and it's almost like we've made no progress towards it since then, so I want to take matters in my own hand. I realize I have a lot of learning to do, and it'll probably be a lifelong thing but I want to design a cold fusion reactor myself. Hopefully I'll be able to make a full computer simulation, although I know a working prototype would be extremely expensive to build. So what kind of things should I read up on? What software…

If I understood well, there is some sort of large? floating? film? placed on the sea surface of marine reserves, where fishing is not allowed. Fish congregate under these by whatever reason they prefer, and when these 'umbrellas' -or parasols- drift outside of the protected zones, fishing fleets do their feast. Clever, and will not extend comments beyond that. Has anyone heard of such or know details about the technique / item put to float ?

Hey Guys and Girls out there What if someone can invent a Motor that can use Human blood as Fuel. It could work like our brain with oxegen. Maybe it could help to invent an exoscelett. In Combination with the help of an Thermoelectric Generator on glas fabric. Hope u answer me with your ideas.

I have come accross this topic when i do some reading but i dont really understand it. Can anybody help on explaining about this and how to do it?

What do you think about cplit cycle Wankel engine? Will that type of engine burn oil like conventional Wankel? If we compare free-piston generator with proposed Wankel modification (used as a generator) which one would be better? ​

Hi all. A piezoelectric disc sensing soundwaves in its surrounding air needs to be protected from corrosive gases in order to avoid deterioration. What type of coating/encapsulation would conduct sound with the least attenuation ? Fluid as grease, soft as silicone, medium as vinyl, hard as epoxy ? With no air gap between the coating and the sensing element ? Thick or thin layer ? Flexible or rigid material ? Rough or smooth surface ? Other considerations ?

To me it seems like the importance of LED technology increases more and more. Often I am reading of the constant and fast development, which leads to great inventions in even more efficient and sustainable lighting, so that now big companies with large production halls or open-plan offices and even whole cities processed LED lighting changeovers in public areas. Sadly I am not really familiar with the technology and details behind LED lighting therefore I am hoping some of you are. Are the advantages like saving of costs really that big, that you should invest in a changover? I'm looking forward to your comments!

Hello, I have trouble finding data of specific heat and thermal conductivity of cast iron at temperatures around 300-1000c. Anyone here that could help out?

No shame, I need troubleshooting assistance. I bought some 17kv wire, an extension cord and a toroidal core with the intention of stepping up 120 to 6kv. Turns: 100:2. (Fyi, Pic demonstrates 1 primary turn not 2) I made two 50:1 voltage dividers (together 2500:1) to measure this voltage. I should have measured about 3-6 volts after the divider. And I did. Then I disconnected one divider, I should get "overload" but instead I get an identical measurement as before. So I disconnect all resistors and get the same voltage. ~4 volts. So I get frustrated and touch both secondary leads together, no sparks. So I measure again, same low voltage…

1. In the given figure, the two rotors (purple, green) are electrically isolated but mechanically fit to rotate along same axis 2. The motor action on the left side rotor will move the armature set, this will produce currents in right side rotor that will pass via a variable load. 3. do you see the magnetic feilds of both rotors cancelling each other especially when the no. of turns are large and the two rotors are close enough. 4. Will this cancel lenz effect on generator side or both sides?

link deleted The invention of Kevlar in 1965 brought back wearable armor, and then armor-piercing bullets were designed to punch through that. The next stage of armor might be more of a giant leap than an incremental improvement: a new type of composite metal foam can stop an armor-piercing bullet in just a fraction of an inch. - See more at: link deleted

OK so I've been working this out in another thread http://www.scienceforums.net/topic/93574-propane-versus-gasoline/and I've come up with the following facts for propane when compared to gasoline: Propane is ~900% cheaper than gasoline (with a 5-7 times greater consumption factored in) given it's average market value in gaseous form is $0.02 compared to $1.80 for Gasoline. Propane only produces 15/16th's of the Co 2 that a 5o2+2C8H18->16Co2+18H2o gasoline combustion reaction does, as propane only produces 3Co2 in a C3H8+5o2 reaction (Times 5 for the consumption rate), so it is slightly more environmentally friendly. Now I know that buses and larger industrial and com…

If I have multiple generators in parallel, is their synchronization important for powering a device if they have a relatively smooth current? What if they are in a series?

I'm working on a simple alternator circuit but there's a few things I don't know. If I have a multi-phase alternator of 3 or more magnets rotating, I don't need a smoothing capacitor because the different phases add to make a smooth signal don't they? If I want it to be DC, do I still need a Wheatstone bridge even though its a smooth signal or just one diode? Some sources say a diode folds a wave form to make it all positive, but some sources say a diode only filters a wave form reducing the effectiveness of a waveform by completely dissipating the negative part of the wave form and reducing the actual energy that passes through while still preventing the current from bei…

Hi all, I have been contemplating the best way to cool my 100 gallon Rubbermaid plastic water trough down to 50ish degrees F on a fairly regular basis. I keep it in my garage and use it as a cold tub for health and performance reasons. I need it to be affordable and as convenient as possible. -I was thinking of maybe an industrial ice maker but theses are $800 and up used on craigslist. -Maybe tarp off the tub and have a portable AC unit blow directly into the tub area.. AC units are still $250 or more and and it seems a cluttered setup. -Buy a chest freezer off craigslist and find a material with high specific heat & conductivity? -I read elsewhere that no comm…