Engineering

Hello there! I have a problem with the measurement and implementation of the following paper (I did it in matlab): "Fast Algorithm for near field synthetic aperture radar processor, IEEE transaction". I would like to know if someone is familiar with the topic of the ground based synthetic aperture radar and can help me. My problem concerns the results of the focusing image... I get strange result and I'm not sure if it is a bug in the matlab code, a wrong measurement setup or just measurements noise such as reflection ecc... I do not post any measurement details, but if need for future discussion I will post it. Thank you Samuele

We have to make a working model on our own scientific idea. I have thought of one but I don't know how to make a working model for it. I have thought of a bag that follows you. For this, you put a device on the back of your shoe and a device is fitted in the bag. The bag is equipped with wheels for movement. When you move your feet, the device calculates the co-ordinates of the parabola and hence the speed. The device at sole is a radio wave or infrared wave emitter which connects itself to the device in bag. Therefore, the bag automatically follows you. Now the problems are- How to make the circuit for this model? Is a wireless connected device, as explained above, a…

what are some basic constructions for said spud guns and which works best

So, a typical television(or monitor) has three colours for the pixels-red, green, and blue. How do they produce yellow(a primary colour)? The TV that Sulu advertises might actually do what it says and provide more vibrant colour since it adds in yellow to the typical RGB scheme.

Hello. I have invented a system of perception for blind people. (I think this is so although I haven't verificate it in the patent office ... Maybe I mistake). My web page (URL) is : http://www.sites.google.com/site/josemanuelruizjorge After that I have passed long time thinking it I haven't obtained almost any response and my invention (probably invention) continues being no public. The explications are in Spanish because my level of english is low and I would have mistakes in the traduction. Thanks for the attention. (P.D. : Forgive me the unnecesary repetitions in the PDF text). (My name is Jose Manuel Ruiz Jorge.).

Firstly, Thanks to anyone who takes the time to try and help me, as i am aware there are people all over the world who are far more intelligent than myself so here goes with my question I have 3 unknown materials which i have to name X,Y and Z and 3 graphs from which i have deduced the Young's Modulus of Elasticity for each material. X= 161.29 GPa (GigaPascals) I think maybe Manganese (Mn) Y= 277.8 GPa (GigaPascals) I think maybe Tungsten Alloy Z= 600 Pa (Pascals) NO IDEA. I have scoured the internet and i have had some success but i do not know if i am right so i was hoping for some guidance in the right direction, Maybe a reference ? Once…

Solar Leaf Cheaper Fuel Cell I came across these two articles recently and it has left me with the impression that we might see some big strides in the solar energy front in the next decade. The first is a solar leaf that can provide hydrogen and oxygen from water economically, the second is a fuel cell manufactured from reasonable materials. What do you think? If a President set a goal similar to Kennedy's man on the moon, could we make serious strides toward energy independence in a decade?

just tinkering building a pellet gun we're using a recycled fire extinguisher aluminum canister we drilled and tapped a hole in the bottom and threaded a one way valve from a bicycle inner tube in the back (and glued it) so it's 1/16 wall thickness (maybe 3/32 but don't think so) and just wondering about safety it handles 100 psi well and shoots well with that pressure. Will the aluminum fatigue? Are we holding a shrapnel bomb at that pressure? I haven't the slightest clue about the formula for designing such a contraption we're just rednecks drinking beer and having fun on the weekend. Thanks in advance because it would not be pleasant to be missing my beer drinking…

If you were given the task of designing the simplest vehicle possible, what would the components be? Assume at least one or two passengers and possibly some cargo. Also assume you would want it to be able to cruise for extended periods at highway or slightly under highway speeds. By simplicity, I am mainly referring to the number of parts and their complexity. Air-cooled engines seem simpler to me than their water-cooled counterparts, for example. I don't know much about electric motors or other types of combustion engines, e.g. rotary engines. A related issue is how much fuel efficiency advances can be achieved alongside simplification of systems. The air-coo…

It is a popular idea that residential energy users can install solar panels and feed their unused energy back into the grid. But doesn't the voltage have to be at a certain level to effectively traverse the grid? Does the transformer that intermediates power between the lines and residences allow weak voltage charge to flow backward? I wouldn't think the current would be strong enough to add anything to the grid, but if it does, how does that work?

We could convert all autos to electric, and phase out all fossil fuel use, except for airplanes. As long as humans use airlines for transportation, they will need fuel from oil or something else. Jet fuel from corn?

It seems to me that a car should be water-tight, so you can survive a tsunami by getting inside your car. But I think cars are death traps in a tsunami. Anyone know how long it would take a car's cabin to fill with water if getting battered around by debris from a tsunami? I propose people living in vulnerable areas should have water-tight cars and it doesn't seem like such a difficult thing to water-proof a car's cabin.

Is it possible to design a machine that can replicate it's self if we give it the materials it needs? I'm thinking like robot that is programed to build replica of it's self. or even like printer that print it's self. Did any body accomplish any thing like this before? If not, do you think that it could possibly be done. If not, are there any law's of physics that prevent this. (do cells do this?) I couldn't find any good results on Google.

I want to start a debate on renewable energy versus nuclear energy. Topics to consider. politics, cost , safety, spent fuel , fuel reserves etc.

So, I'm not an engineer, but I think this is pretty sweet, and I figure engineers might enjoy it even more than I would.

As a kid I was electrocuted by being in contact with approximately 400 volts ( alternating ) at a street light . I don't know how long this was for as my perception of time became distorted . Possibly , it lasted less than 5 seconds . I don't recommend anybody intentionally makes contact with a voltage like this in this way . Funny as it might sound , does anybody have any idea of how much energy I dissipated ?

I've been working on a project for a number of years now. It's *almost* completed. In short, I believe it will be the world's most powerful gun powered by "hardware store-level technology". Not the largest, mind you, but the most powerful. Muzzle energy should be in excess of 2 MJ. In any event, it's a fun project that I figured folks around here might get a chuckle out of. Below is a pic. It's a bit dated; lots has happened since the pic was taken, but it should give you an idea....

Is it easy to make a safe one? I'm not concerned with mobility.

for small wind turbines (domestic uses), do they only influence the Cp with controlling the tip speed ratio. And do nothing to the pitch? was just wondering. I assume at small levels that it becomes too expensive to put in a controller to and movable blades to allow that. AND, if anyone knows of any internet resources where the techniques are discussed how the TSR is controlled let me know of them? I've seen things that are too basic or too complicated. nothing in between.

Can some one share some good test book or even video lecture on mechanical engineering

Well here we go. First off i am working on this concepts for a project of mine. and i am not educated in the usage of magnets. So i ask you. My project is basic I am curious what the power requirements would be to magnetically levitate a 4000 pound object that is roughly 20 ft X 6ft in size. The suspension will have 4 points 1 in each corner and must be levitated a minimum of 6 inches. if there are any options with actual magnets and opposing forces please leave some feedback because that would work too. if anyone could help with this would be great.

i have one question. How do I determine pipe schedule number for a given design pressure? Is there any simple formula for determining the schedule number? Please advise me. Thanks a lot.

Hi, I'd like to know if it is possible to build a home-made laser pointer, without opening up a CD-ROM/DVD burner to extract the diode needed? If it is possible then does anyone care to explain how this is done or provide a link/book/source on this? If not, what's the cheapest way of aquiring the materials and/or devices needed to build one. Its for a home-fun-project, so nothing too serious but it is worth noting that this will be my first. I'd just like to know more about how a laser works and have done some reading on the web, but I guess you just don't get it 'till you get your hands dirty.

Lets say if i have a test tube (diameter 3cm and height 30cm) seal with a rubber. in the test tube there 100ml of water = around 10 cm height. if air was flow into the test tube from bottom of the tube with flow rate around 20L/min, and after a few sec, the rubber was push out. in general i understand that the pressure inside the test tube is higher than atmospheric pressure. but i cant find any mathematical solution that relate flow rate and pressure to proof that the pressure inside the test tube is higher than outside. can anyone explain it to me.

Can we make a portable bridge? (Model) What is the material required? What are its advantages and disadvantages? Thanks in advance. |rkt|