Engineering

I'm looking for a lubricant for my bike chain that will dry out but can resist rain for longer than the ones usually available for bikes. Wet bike chain lubes that do resist rain attract dust in dry weather and soon get clogged up and dirty to handle. Normal chain oils are just a nightmare for attracting dirt in any conditions; specialist bike chain wet lubes aren't quite as wet as normal oils. I'm just wondering if anyone knows of a lube, maybe used in some other discipline, that may meet my requirements. For clarity: A 'wet' lube is for wet weather because it resists rain. It is slightly sticky, but not wet itself. A 'dry' lube is for dry weather and is not sti…

So, I dunno, I just want a device where I can broadcast my own signal all day, from my laptop, like data signal, what device am I looking for?

I am trying to etch silicon on HF based electrolyte, I am using Gamry reference 3000, The script I am running is PWR-800 Galvanostatic-Stack cell. My connection seems fine, I am connecting greem-blue lead on one side and red-orange lead on the other side, black and white are connected to each other. It is showing CA overload , what should be done to make it run normal. Earlier I was using Chronopotentiometry script and was connecting blue-green lead on one side and red-black on the other side. It was showing voltage and CA overload, to get rid of voltage overload I started using stack cell type in PWR 800 script.

hi dear scientists ; I would take patent(s) from this country's institute(s) if(/how) it is possible (/is). I request from the scientists whoes had (already) taken patent or who have been trying this to tell us steps ,requirements (not general requitrements implied ,general requirements have already been explained on their websites ) I can simply mean ; people who live the real events know more clearly everything related incident that he/she lived. therefore ,although the basic requirements have alredy been explained ,there would be probably existed else and different/(containinin some particular) information relevant to those researchers e-mails' contacting…

Perhaps I'm not understanding the correct concept of geothermal energy, so this suggestion may be a bit ignorant..but: Geothermal energy is essentially using heat from the earth (i.e. hot magma) to heat water, which spins a turbine.. blah blah..you know. Is this strictly done only at existing geysers? Because I was thinking, though it is expensive, wouldn't it still be cost effective in the long run just to dig say 500-1000ft into the earth where it's hot e enough to massive pipes to heat water? Once you dig the hole, and it's paid off, that's basically a never ending heat source, compared to nuclear energy or fossil fuels. We'vemanaged to build a ton of …

I forget how are they named... optical something... Is there vendors that you know of, for 'benchtop' size? They work by shining a laser onto some fluid that solidifies when hit by its ultraviolet light. Sort of a loca glue curing layer by layer to form a solid.

You cannot tell me the pyramids were built with ropes and logs, nope not buying it! As impressive as the great pyramid is, there are other ancient structures just as unexplainable: https://en.wikipedia.org/wiki/Pumapunku https://en.wikipedia.org/wiki/Unfinished_obelisk https://en.wikipedia.org/wiki/Baalbek https://en.wikipedia.org/wiki/Karnak Honestly the list goes on endlessly, our best guesses being unbelievably primitive techniques that are woefully insufficient in explaining how or why these sites/structures were built. LET ME GET OUT OF THE WAY I AM NOT A ANCIENT ALIEN NUT. I simply believe that there is far more to our history than what the record books show, an…

I have calibrated and determined the various volume parameters like Manifold volume, Sample cell volume and void volume. I have also interfaced a pressure transducer and the various valve controls. I'm using nitrogen gas as my adsorbate and BCR 171 Alumina sample as my adsorbent. I'm finding it difficult to incorporate the real gas coefficient in my calculations to analyze the behavior of the adsorbate in the region where the sample cell is immersed in the liquid nitrogen bath. As a result I'm not able to obtain the desired isotherm curve for my sample. An example consisting of step-wise calculations would be really helpful. I am willing to share the various volume and pr…

I think they are called 'glands' when on a flat surface. What is a proper tool to machine the 'nesting' for o-rings on bronze ? Would hole saws like these work : ? ----> http://g02.a.alicdn.com/kf/HTB1GC9kIVXXXXX5aXXXq6xXFXXX1/6MM-8MM-10MM-12MM-15MM-16MM-18MM-20MM-22MM-30MM-Diamond-Coated-Tool-Drill-Bits-Hole.jpg ----> http://img0.ph.126.net/YOwISOkx75ndkvzu3D3Dnw==/6619241418630639771.jpg Or something else ?

I was thinking and got the following ideia. Imagine 2 planets and an asteroid. Both A and B have the same speeds and orbit around their suns. To make things more interesting there are 2 ways B can spin clockwise or counterclockwise. I hope u guys understanded everthing so far. So my question is, is this prepetual motion? In my opinion the asteroide will be "stuck" while moving in this kind of loop.

I want to simulate like a circuit inside computer, 2D or 3D, but at the resistor place I want an actual voltage to come out KAPAW, so I can have the image of a simulated current and wire inside the computer, pretty much I'd like to simulate voltage at any spot I want inside a 3D graphical space (multiple places) inside a computer. Any idea how I can do that?

I have another question, i would like to raise. Lets imagine that i have an projecter and when i put it in the direction of the wall, the image appear on the wall. So may question is. It is possible to make an "invisible wall"(a thing will block the ligth), in order to appear the image is floating in the air. obs:google glass or glasses dont coun't. My hypothesis is some kind of waves, maybe using nanotechnology(i doubt) or using the sound(an option that seems explorable).

Intro I was walking today on the street and remenber of the past. I think i saw an UFO when i was 8 years. If i was sleeping or not, i have no ideia, but lets continue. Problem It was something like this(sometimes it would appear an red ligth other times blue)(maybe an airplane u would say): Part1(is the cirlce on the top) Part2(is the circle on the buttom) Middle(is where the blue/red circles are placed) Now my questions starts. In order to put this to fly i belive the the parts 1 and 2 have to move. We will not question the way this parts are connected to the Middle for now. Question 1: If only the part1 would spin which way should it be? a)rigth to le…

I run a small R&D consultancy in the UK. I research and build mainly proof-of-concept devices for inventors and small businesses (but I'm not myself an electronics or electrical engineer). Many of my clients have no technical background so sometimes I get enquiries about perpetual motion type ideas. I presently have an enquiry from a person who I'm in dispute with regarding the purpose and function of alternator generators. My prospective client believes that 'self excitation' means that the alternator can create energy. I have been trying my best to convince him that the electricity is generated by converting mechanical rotation into electrical energy. But nothng …

Dear All, First, please apologise my bad English (I'm not from the UK...). If my wording is not clear enough, please don't hesitate to ask me. I'm interested in dc current distribution into the ground for modelling purposes. I could read on a technical paper that the voltage between two points in a homogeneous ground (constant resistivity) could be calculated by V=Rho/(2xPixd) where: - Rho is the ground resistivity (in Ohm.m) - V is the voltage between the two considered points (in V) - d is the distance separating the two points. The formula is extracted from the resistance of half a sphere and whose center is point A, whilst point B is on the surface…

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…