Engineering

that transmitter must send a audio through it, for a distance of 20meters and the receiver takes and send via speakers ......... how to do it .......... (we need to transmit a audio from a transmitter for about 20meters) ....... plz tell me the specification also ... frequency range ... wht type of modulation required ...........plz .........

I am sure there is a simple explanation (and please keep it simple) but the idea is to replace the gas motor on an electrical generator with a high efficiency electric motor then to repeat in series with 2 generators running on the electricity produced from the first generator then 4 then 8 etc. R.e. a 5 h.p electric motor runs the first generator which has an output high enough to run 2 generators etc etc.It sounds so simple i am sure there is a reason it won't work.

I have to use a small air receiver to build a wheeled vehicle that will be operated by compressed air. The goal is to build the vehicle that can travel in a straight line, towing a standard load (about 3-4 lbs), on one charge of 90 psi in the receiver.The volume of the receiver is 16 cu in. I cant use any air or electric motors. But I can use cylinders. What are some good ideas to accomplish this? I was thinking of using a crank shaft mechanism with the cylinder. How can I make the most out of 90 psi of pressure.

I put this question to structural engineers everywhere: Is the visual evidence recorded during the World Trade Center disaster in New York consistent with a carefully-engineered, controlled demolition using staged thermite detonations? Can that possibility be ruled out? I'm not talking about political plausibility. Just the best judgment that Science Forums.Net engineer participants can bring to bear. Let us keep this discussion logical, rational if you please.

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Well reading the news article it is going to be very very vey I say again very very very costly . Reading the news article it saying it is going to be around 2020 before NASA can go in space and about only one space launch a year that is so silly to spend that much money to do only one space launch a year . http://www.theglobeandmail.com/news/world/nasa-unveils-plans-for-mammoth-rocket/article2166652/page1/ Quote But with a price tag that some estimate at $35-billion, it may not fly with Congress.Quote With this so costly it will be like the space shuttle it will get scrapped in 15 or 20 years if you lucky after going in service. Quote The multibi…

Hello you all! Some fabulous rocket engines exist already and use oxygen and kerosene in a staged combustion cycle (drawing), where all liquid oxygen is pumped to a huge pressure, burnt with little kerosene to achieve a reasonable temperature, passes through the turbine that moves the pumps, and burns the rest of the kerosene in a main chamber at high pressure. This most efficient cycle gives for instance the RD-170 its 8MN thrust (record) and 337s vacuum specific impulse (record with first-stage kerosene) and the RD-0124 its 359s specific impulse (record with kerosene). Better: the single slow turbo-pump makes cheap engines, and pressure makes them compact. http://w…

Carbon nanotube spring batteries are a technology waiting for mass nanotube forest growth methods to become consistent enough that there are no major defects lowering their combined tensile strength. They have the potential for an energy density ten times that of the best current rechargeable batteries. Unlike current batteries, and even upcoming batteries like lithium nanowire batteries with the same potential tenfold increase, they can also have flexible and amazing power density, can be cycled infinitely without wearing out, are insensitive to environmental factors like temperature, can store energy indefinitely without leakage, and are probably more environmentally fr…

Antimatter is everything matter is not: the protons are negative, the electrons are positive, and the neutrons are neutral. Physically, there is not much difference between matter and antimatter, the seem to follow the same basic principles as matter. But, although they act alike, when in the presence of one another, they annihalate each other and release an amazing amount of energy. This antimatter energy is not hard to come by. Simply create antimatter in an accelerator, present it to matter, and it creates useable energy. Engineers everywhere are searching for new, efficient ways to get to planet Mars. People have tried combustion, people have tried nuclear. Why no…

How can i increase my laptop's battery? I mean to say should i unplug the charger after it shows 'full battery' or i should continues using it with plugged charger?

Would a nuclear bomb work in a vacuum? How would the concussive force and heat transfer without matter? Does it give off enough radiation to generate the kind of heat that would make it a formidable weapon? I know the sun is basically a nuclear bomb, but I am only talking about tactical size nuclear bombs. Stemming off of this question, what is a concussive force? I always hear of something called a blast radius. What kind of energy is the blast? Is it some kind of force like electromagnetism? What comes out of the explosion that does all the harm?

What technological challenges stand in the way of making molecular assemblers? I mean, what exactly would it entail to generate some sort of nanotechnology that could assemble, from scratch, a car or something? I've heard something about the "fat fingers" and "sticky fingers" problem and something about a debate between Eric Drexler and a professor name Smalley. I'm just wondering if it's possible that we'll, one day, have molecular assemblers. Any thoughts?

Hello Please I want your help for provide me mathematical model of cpu and another of Hard DIsk ,i need understand thermal behavior I am not working in Modeling to use Software ,The Idea that I want Ready Mathematical Model for Processor Whatever And Another for HardDisk Whatever ,I want to understand these Models and Thinking for strategy in cooling,this Work for Getting Master in Degree so I want very Help Please

I'm thinking about making a new type of hot air balloon, but I need to see if I can even make the math/physics work out let alone the engineering. I would be more than happy to collaborate on the effort, may be make some one very rich. How much heat would it take to lift a spherical hot air balloon (r= 81.4) x ft in to the air? How much heat at x altitude (function would be appreciated) would be needed to raise the balloon 200 ft? I'm most concerned with the lift off, as once in flight I have a different source of power than a flame.

how can i made a city bus to identify its position in road and automatically displayed its stop inside the bus .... and via speakers also .......... what r all the methods can i use to make this ???

does anyone know where I can find a complete and reliable data of specific heat capacity for gases?..

basically if you are or were a chemical engineering student, you'll know what im talking about My simple question is, after all the synthesizing a process flow, we're suppose to the the material and energy balance.. we have done some literature review on the operating parameters and stuff.. but for the reaction part, we have trouble determining the conversion..gas phase catalytic reaction, (methanol production) Since we are dealing with 3 reactions in parallel, how are we suppose to go about it?.. is there any good reference that i can use to determine the equilibrium of the reaction?.. anything that gives me idea on how to determine the conversion thanks.…

Hi everyone, As it has been already mentioned, biomass and waste-to-energy processes could stand as a great alternative to nuclear power. http://www.biomassen...-world-nuclear. Bioenergy combines various benefits (i.e. for biogas check out http://www.biomassen...fits-advantages) especially the fact that similarly to nuclear plants are base load power stations (constant power supply). At the same time, besides of energy production they can be considered as significant waste management methods.

I am not a nuclear engineer, but I do understand that control and confinement of hot nuclear fusion has been and continues to be difficult. Holding a hot plasma in place while it produces energy has been complicated by stability problems. Is anyone here familiar with the concept of the superregenerative radio receiver? The receiver is deliberately driven into regeneration and then just as deliberately driven back out of regeneration at a regular rate called the "quench frequency". Could a hot fusion reactor be controlled similarly? Drive it into fusion, hold it there briefly and then drive it back out at a regular rate. The quench rate, waveshape, etc. would probab…

Hi. A piston compressor can, but Would a scroll compressor work as an air motor if fed by compressed air ? Would it turn accordingly to its air supply? They work hot as any compressor and their machined tolerances would be not ideal if they will run very cold because of the expansion. What considerations/re-machining would be convenient to implement, or what would be detrimental to its performance/efficiency if not re-machined ? Would internal heating from friction be 'helpful' to efficiency as it would aid into the expansion?

Well I was wondering watching a wind turbine park newly installed on a mountain here close. The shape of the blades look like that of an airplane, about like in the following picture. There is an obvious difference with the shape given by ancients who had only empirical knowledge, like in this windmill here below Empirical evidence says that you get the stronger force at the largest radius, and the Greek has constructed the windmill with the largest surface of the 'blades" far from the centre. Why are the blades in a modern wind turbine with the shape getting smaller to the edge? It is not the same principle as in an airplane where the motor gives the impulse…

Hello, I am looking for help because I am in WAY over my head (ANY HELP IS APPRECIATED)! I started a science fair project with two other people and we're planning on completing it this year. We decided to do a project involving unmanned drones. We have narrowed our project down to creating a 3D imaging vehicle that operates autonomously in land, water, and air. I am planning on using the XBOX Kinects in order to do the 3D imaging and hook it up into an "omnothopter - esque" machine, basically our mechanical engineer plans to implement a variety of different small engines for air and a few gripped engines for aquatic conditions ( I will post a rough blue print once he fini…

Yes, it's me with an airplane disaster-related question again.. Still recovering from shivering induced by watching a scary documentary about the Alaska airlines flight 261 crash, I ask myself why the trim tabs (is that correct terminology?) are designed in the way they are (at least on the MD-80). As far as I understand, control of the aircraft was irrevocably lost when a jammed jackscrew finally disintegrated and the control surface pitched violently up around its hinge due to the airflow. To me, it seems intuitively safer to reverse the design and have the jackscrew located behind the hinge. In case of total jackscrew failure, which I believe is less unlikely than…

Some slight confusion on the part of electricity and the conversion to mechanical force; I believe I understand enough about circuits, current flow, capacitors and the like to know that side of the question, but what I don't see is how electricity is converted to large scale (relative to an electron) motion. For example, if I wanted to make an extremely basic fan, how would I go about doing it so that the electric potential stored inside the batteries powers the movement of the blades?

I've got a general question about how something's shape affects it's, uh, strength? Perhaps an example would be more helpful; when eating pizza, the front of the slice will fold down unless the eater bends the slice vertically, what's up with that? A similar scenario occurs with a flat piece of paper, it'll droop unless folded to make a parabolic shape, why does this occur?