Engineering

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...

The black box is the housing. The green bar will be wrapped with nichrome wire. I need help calculating how much voltage i need to run. The battery supply must be button cells. Im sorry for the bad explanation plz ask questions so i can further explain. The wire must be hot enough to burn

So maybe I'm just a wild dreamer but I have a theory that has been rolling around in my head and I thought I would throw it out there for someone to critic. My theory is on carbon nanotubes and the production methods to date. I have read many articles online and have come up with what I believe would be an interesting experiment. When I think of carbon nanotubes I think of cotton candy. Its light flexible and comes apart in almost lighter than air strings. So if this thinking is correct why are the carbon nanotubes not being produced with a similar method? Inert hydrocarbon gases pumped into a super heated spinning perforated centrifuge with a collecting sub straight arou…

See this video and how wave power is generating electricity at costs well below that of nuclear power!

There are many places in the world where some fixed connection is being considered between two land sides divided by an ocean or sea. Projects under consideration are for example: * bering street (alaska-russia) * gibraltar (marocco-spain) Engineering faces challenges there. But in all those cases they opt either for a fixed standing bridge (on pillars) or a tunnel, or combination of them. Why could (in theory) a bridge not be built on floating structures attached to the sea floor with on top of it a kind of bridge design. The railways or roads then would go through a tube which would have some flexibility and attached to the top structure using dampers, …

Hi. Does anyone know what is a distance the compressive stress propagate in a horizontal isotropic plate whilst a plate is loaded horizontally. The compressive load is applied to the right edge of a plate by a cylindrical indenter. The left plate's edge is fixed. Laws, formulas, principles .. Thanks in advance.

Could someone elaborate me the definition of reduced stiffness (how it differs from the stiffness) of a body? When and how the reduced stiffness is measured? Regards

Am posting this in 'Engineering' as at the 'Lounge' would not make it to its level... Very worth for all ! BIBS ON ! -----> Enjoy...

I have been able to find small heart beat sensors (in the size of wrist watches). I would like to know what kind of sensors are employed in this watch? Regards

Does anyone know whether the common claim that, had the Titanic have simply put the engines in full reverse and then hit the iceberg head on, that it either wouldn't have sank at all or else would have taken much longer to sink? At first glance, this seems like a fairly likely conclusion, considering that the iceberg essentially sliced open the entire side of the ship's hull, and I can't help but wonder whether it could have simply plowed right through that iceberg if it was going fast enough. But on the other hand, the kinetic energy behind the ship when it struck head on would likely have been gargantuan, so might this have in fact made the situation even worse rather t…

I am researching about Agriculture Patents . Could anyone help me out? Thanks

When and how will we be able to achieve the technology to travel at the speed of light? It would make exploring foreign planets much easier.

There are a lot of articles and doccuments talking about the "Free Energy" machines, but there is any real demonstration of its operation? There is any physical explanation to accept or to refute it?

Is there a 'resonant/optimal' frequency to be selected for heating a particular metal/alloy, or the dimensions of the part to be worked on has a factor on selecting the frequency ?

Dear Forum, I need a simulation program that could be used to optimize the free air flux distribution of a pulse coil (capacitive discharge). I would like to change parameters and see a plot of flux lines around the coil, and be able to determine Gauss levels at different points. Does anyone know of anything that will do this? Thank you very much! Sincerely, Mike B)

ok so i have somewhat had an idea of making a laser that can melt metals or potentally be used as weapons of war