Engineering

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…

I never did much with gears. I have a rack with 20 teeth and I want a very small gear to fit on it. I would think that if I wanted the size of the gear to be, say, 1/2 the length of the rack in circumference, then the gear would have 1/2 the number of spurs but with the same length and height as the teeth on the rack, but I don' know for sure. I mean you can't just have different sizes and have the gear with the same number of teeth on each gear could you? At some point it seems like it wouldn't fit.

Nowadays we already heard and see the auto-pilot vehicle invention but does it really practical if all the vehicle in this world are all auto pilot. What is the advantages and disadvantages of auto-pilot vehicle invention if in the future all vehicles are going to use fully auto-pilot vehicle invention?

So the gist is that i'm a new scifi writer and i just want some peoples input on what are some technology, gadgets and weapons we'd find in the future?

Hey everyone Recently somebody told me that microwaves cause cancer because they use radiation to cook the food. He said that since radiation causes cancer then "logically"(improper use of logic) microwaves cause cancer, and that it was a government conspiracy blah blah blah. Either way in a week 3 MORE people have said it, different stories behind the thing but the same basic principle, radiation causes cancer so microwaves cause cancer. So I looked it up, and lots and lots of people are saying it. I looked up how it works and it says it uses radio waves at a set frequency to agitate water molecules. This causes them to vibrate and cause friction, which cooks your …

Hello everyone, i didn't have time to study the solving techniques in Simulink/Matlab, so i'm just asking Matlab users, which method is more reliable ? and giving accurate results which are close to those of experiment ? I use Runge Kutta often for its precision, but in a new simulation it wasn't reliable, and Bogacki Shampine was better. Thanks in advances for your answers. PS: i wasn't sure were to post this topic, but because Matlab is used by engineers mostly, i chose to post it here.

Hello everyone, the other day a friend of mine said that we should harness the power in lightning to power everything. And I quote he said "One lightning strike has enough energy in it to power my entire town forever!" Now this is high school, so obviously his thoughts on how much energy that is in a lightning bolt is greatly exaggerated, or he doesn't understand that energy gets used up in kilowatt-hours rather than simply kilowatts. Either way, I failed to mention this and said that he may be able to use a superconductor if you could get the lightning to hit it. He said ok and went on his merry way. But upon further thought when I was bored I began wondering if theres a…

Hello all. If a solar panel during cloudy daylight gets total shade on several cells, as from an object fallen/covering them ; If a solar panel in full darkness at night gets some cells illuminated by a flashlight ; Is there still some current passing/generation in both cases ? Or dark cells will block flow of current for the whole panel ?

Since we are thinking about colonizing other planets, it would be goood to establish test colonies in some more inhospitable places on the Earth. I am thinking about a test colony for between 300 and 1000 people, located either somewhere in Greenland, the edge of Antarctica or northern Canada is it possible to establish a settlement in these areas that is self sufficient in food and energy, using technology available in 5-10 years? The town would be built with a fairy high initial ivestment. Energy would be generated via solar, wind and possibly tidal generators and food would be grown in greenhouses. It would be built on a low lying area with a possibility of fi…

Every type of electric thrusters used in space that i have seen ejects matter to move, even the ionic thrusters use xenom to move, fully electric thrusters exist?,