Engineering

Hey, Lately I've been wondering if it would be profitable for a person to start making biofuel in their back yard, throw it into an electricity generator, and then pour that back toward the electric power companies. Would this be a profitable venture?

Hello everyone, I had gone on the chat and I was referred and encouraged to put my question on this engineering section. I am having a very hard time finding sources to locate an electromagnetic engineer with very specific experience. I would appreciate it if anyone could guide me as to where I may find forums, societies, boards, school bulletins or school boards on this subject. Where do electromagnetic engineers hang and chat? I am looking for someone that is just finishing with their Ph.D or Masters in Electrical/Electromagnetic Engineering. Preferably Ph.D. I am not seeking EE's concerning RF, antennas or microwaves. I am looking for someone that has the…

We Use Air to power cars. There will be air vents on the side of the car that pulls air in while your driving. The air will go into a small air turbine which will generate electricity.

I am trying to wire a circuit for a prop I'm making, but I have run into a conundrum. Here is our setup: Battery --------> Switch----Button-------------sound-playing device | ----Button-------------sound-playing device \------------------------------------------------------------^ How would I get rid of the two buttons in exchange for one button that can tell which sound-playing device (and thus which sound) to make depending on the position of the switch? The only temporary buttons I've seen are those that have 2 contacts.

Hello everyone, I am needed to apply a filter to some acceleration data. That I think I can handle (I have chosen a Butterworth). What I do not understand are the CFC (Channel Filter Class) specifications. In particular, I do not know what a "Stop Damping" number specified in -dB is. Below is an example of a CFC60. Filter type CFC 60 Filter parameters 3 dB limit frequency: 100 Hz Stop damping: –30 dB Sampling frequency: At least 600 Hz My sensor samples at 400 Hz which puts my CFC at about 36. Please correct me if I am wrong. At CFC 36, what would my parameters be? Do they define cut-off frequencies? Thank you for any help. Google-skill"z" are failing me. Davi…

Any Engineers here? Of all fields of course. I'm just wondering, b/c I'm going to be a future Engineer too, & was wondering what you guys are doing right now, what you think of your career, is it fulfilling, etc.

Hello semiconductor technologists! I'm thinking at a source of extreme UV for semiconductor lithography, so what would be your wishes, as compared to the first figures that emerge from my rantings? I take 30nm wavelength. Would less be better? I fear fluorescence hampers lithography. Right now I estimate half a watt of light is produced, continuous and monochromatic and coherent, initially in a narrow beam of small divergence. Could that be enough? This absolute silver bullet would cost several millions. Is that any worry? Thanks! Marc Schaefer, aka Enthalpy

As a teenager, I was digging around in my parent's garage and I came across a rather curious photograph. I was looking at it trying to figure out what it was when my father walked in, saw what I was doing, and explained.... Once upon a time he'd been an engineer on the team that designed/built the very first FLIR. When the team was ready, they'd driven the FLIR to the top of a local mountain, turned it on, and viewed the surrounding valley. At night, of course. It was the first time a FLIR had ever been used. They took a picture of the display. That picture was what I held in my hands. Cool. Two weeks ago, my father passed away. Yesterday, while going…

why direction of rotating emf and direction of rotation of field(with the help of a motor) is to be maintained same while conducting slip test on a synchronous machine? The reason we rotate the field with the help of a motor is to maintain some relative speed between rotating flux and field winding.If we rotate in opposite direction then also we can have relative speed(and may get fluctuations in voltmeter and ammeter). But we rotate the field in the direction of rotation of flux only.WHY?

I want to know the list of aerofoils, which is used in small wind turbine blade design

I'm trying to make a simple stencil that can be placed on a plastic, plexiglass, or PVC-type surface, but the stencil I have is too small and detailed to be "cut out" the normal way. Any ideas?

Can we use Electromagnetic Pulse as a weapon????Is it also harmful for Electronics devices???

Hi, given that it should be relatively simple to design a computer keyboard that generated electricity via keypresses, maybe through some kind of induction coil arrangement of some kind for example, if you had a nearly unlimited (but not infinite) supply of monkeys, how many monkeys would you need and how many keypresses and with what frequency might be reasonable (say in words per minute, or key strokes per minute) to power an average 40 Watt light bulb for 20 minutes? I know it sounds like a dumb question, but it's for a young people's training event and we would like to show them that science can be fun and interesting, as well as useful and serious. As a biologist…

Whom would you call if you wanted to know the history, the development and the state of the art of transcutaneous blood glucose sensing? I'm searching for prior art that calls into question the validity of certain patent claims relevant to transcutaneous blood glucose sensing. I'm looking for information that pre-dates 2005. Did you work on early blood glucose monitoring devices? Feel free to contact me with any questions or suggestions, I'd be happy to give you more details and speak with you offline.

what if you supercooled the air intake ports? that would allow increased density of 02 in the engine so wouldn't that increase efficiency?

Hello all, I have a question and I hope some of you might have an answer for me. I have to combine the 3-axes signals from a MEMS accelerometer in MATLAB so that I have the resulting signal as an input to several filters. Do you know how is that possible? I tried to find more information online but that was not successful. Whatever you know about this topic is useful so please do not hesitate to contact me. Eirini

I want to build a toy quadcopter but with a 1w fuel cell. I'm hoping it will last hours instead of minutes. I've found reasonably priced 1w fuel cells that are light enough but I can't find any small 700 bar tanks to hold the hydrogen and oxygen. Anyone know where I can find small tanks that can hold such great pressures?

What would be the approximate volume of air ( if any) flowing OUT of the 4 inch pipe and into the house over the course of one hour if the outside air temperature was 90 degrees Fahrenheit ( 32C )? At a depth of approximately 10 feet (3 meters) below the surface of the earth here the temperature is about 72 degrees Fahrenheit ( 22 C) year round. (Goswami and Biseli 1993). 4" PVC pipe extends 400 feet below grade. Inside 4" pipe is 2" PVC pipe filled with 72 degree water. 4" pipe enter house and is vented through roof 15 feet above grade. 2" pipe provides water to plumbing fixtures in house. 4" pipe is also vented inside house 1 foot above grade. How mu…

I want to use a digital input(negative trigger) to moniter the opening and closing of a trailer door through my tracking device,can someone assist please?

I'm designing a circuit to switch a 120VAC socket with a triac driven by a low DC voltage signal through a MOC3020 opto-isolated diac. I want to be able to sense a fault, defined as [math]FLT = \left(TP1\land\left(\left(\phi TP2\neq\phi TP4\right)\lor\left(\phi TP3\neq\phi TP4\right)\right)\right)\lor\left(\overline{TP1}\land\left(\left(\phi TP2 =\phi TP4\right)\lor\left(\phi TP3 = \phi TP4\right)\right)\right)[/math] I know I'm probably using the wrong symbols, but the meaning is: There's a fault if, whether there's anything plugged into J1 or not, TP1 is high and there's no signal through V01 or D1, or TP1 is low and there is a signal through the diac o…

1 mole of He=4g c=3x108 p=mv p=1.2x109 As a point of comparison, according to wikipedia, the space shuttle is approximately 108kg. Our 4g of He would have about the same momentum as a space shuttle going 10m/s. So, this gives us a ridiculous change in momentum for a small amount of gas(yes, I know the particles can't go at c; this is an order of magnitude thing). So, what we need is a really good ion drive. How difficult would it be to develop an ion drive capable of accelerating the gas to near light speed? I'm assuming we'd need good superconductors and some sort of nuclear reactor as a power source. What else?

Hi, I have been tossing some crazy idea around It came to me when I was using an acetylene torch. You open the gas and you light it, this will give you a flame that will not even put a cup of water to boil. Now you open the oxygen and you have a flame that will melt metal. So here is my idea, but first I want to make sure that you understand that I do not want to increase the power output of any engine 50HP engine should still produce 50HP but with a lower gasoline consumption. You already guessed that I want to put (some) oxygen in the mix. At start up this oxygen is produced by electrolyses (energy taken from the battery) The oxygen is then fed back …

I am facing the following interesting problem. A closed room\hall contains several identical machines in it they are fed by an electrical cable. The machines can be turned on or off. When a machine is turned on, it consumes electrical energy and as a byproduct generates heat. The heat is conducted and radiated through the room walls to the outside air. At present there are 2 machines in the room, but the designers consider placing more machines in the room. As more machines are added and become operational the structure outside temperature increases. The concern is that the outside surface area of the structure will become too hot. The outside skin is not convention…

How would you account for soundwithout visible eminence such as people talking other then a form of insanityor schizophrenia? I mean as far as asound illusion. I speak of voices and sound effects seeming tocome from nowhere that are emanated as if by complicated mobile sound equipmentfrom unseen location. I want to know possible ways this can be achievedto pull a prank on someone like something out of Scooby-Doo.

Hello every one ........ this is my first post and I just wanted to share an idea... can we generate electricity from sound energy...??like making the speaker work in the opposite way.... thank you...