Engineering

Hello, I am writing here to ask a question that maybe someone here can answer. My friends and I do what is call extreme overclocking. We use Liquid Nitrogen to super cool computer processors to make them run at far beyond manufacturers expectations and calculate things like super pi. We are facing an issue, We use a copper pot to fill with liquid nitrogen and then place this on top of the (IHS) Internal heat spreader of the CPU, now we have been testing thermal pastes/ greases as the medium between these. We are finding that if we place a k-type probe on the IHS and the bottom of the copper pot, once we pass -130c there becomes a massive delta between the two probes,…

I have seen claims of 400% efficiency in geothermal DX HVAC systems. If you are putting in 100 units of energy and getting 400 units out, could this arrangement be used to generate electricity somehow? I know there is geothermal power generation at underground hotspots, but could any old spot be used to generate power using a DX type ground loop? If you have 400% efficiency, there must be a way to turn that into electrical power.

Anyone know any decent tutorials on control theory. I must model a windturbine. but just need something to help me go through the process of modelling it and then using the laplace transfrom so i can draw the block diagram. ANY tutorial. it doesnt have to be a windturbine. any device that was modelled. I've kind of learned it before and am trawling through old notes but i'd love to find something that just ran through the details of it to save time.

hello, I have been investigating all the different types of materials to sound proof a room...walls and ceiling. I am opening a cafe and there may be too much noise for the business beside mine. I need to make sure it really is as sound proof as I can get it on a rather tight budget. I am going to drop the ceiling and strap the existing walls. There are so many methods but I need to know which one actually works and can I do it with my tight budget?? Cher

Hi While performing a hydrostatic pressure test with water in a pressure pipe we are experiencing loss of pressure most likely caused by leaks through pipe joints. Is there any equation that can theoretically calculate the amount of water that has leaked from the pipe based on the amount of pressure lost over a given time? Below I have some rough numbers. Pipe Diameter = 30 inches Pipe Length = 1000 feet Pipe Volume = 4908 cubic feet = 36,710 gallons Starting Pressure = 100 psi Final Pressure = 95 psi or a 5 psi pressure drop Length of Time to drop pressure = 4 hours Thanks

I don't know much about PV panels, but it seemed to me that some at least are translucent. For translucent panels. could their efficiency be improved by putting mirrors behind the panels to reflect back to the panels, light that has already passed through?

1. Computer Science and IT 2. E&C and EEE and Electronics&Instrumentation 3. Mechanical and Civil and B. arch(though this is not an engineering branch) Please also tell about these branches according to their scope in future.

Hi, I'm sorry to bother you all but I'm in need of some assistance. I need a calculator or spreadsheet that can (trough approximation) determine the percentage of certain components (within an error margin) needed to have a specific final solution. An example of a possible use would be creating a medicine or a feed for an animal. You have your list of ingredients but each ingredient has a list of nutritional details and these may have another sub list. You want a final solution with A amount of energy, B - fiber, C - protein; From the proteins you want a specific amount of a few amino acids. I would like anyone that knows any programs that are capable of determi…

Can you imagine this, a clear water puddle with a silt deposited at the bottom. When i stirred the puddle gently, the mud below rising up and form various turbulence shape and also some small tornadoes. So i'm wondering if the same thing happen in our atmosphere where the water represent the air while the mud represent clouds. If it same, can we use computational fluid dynamics to calculated the behavior of the cloud especially for tornadoes and hurricanes??

when you plug a power cord into an outlet, but when you don't connect that power cord into (let just say a laptop) where does that energy goes? Do all of those energy transforms to heat? I heard of the term "save energy, and unplug your electronic when they're not in use"(or something close to that) a lot.

Hi, I'm Kyle, Here is my question; I have built a small alternator (as a hobby science project) which can generate enough electricity to cause pain when in contact with the terminals, yet not even a 1.5 volt flashlight bulb will light when connected. The alternator has four magnets on the rotor (alternating and placed at 90 degrees apart from each other) and four coils on the stator which at every 1/4 of a turn all four coils and magnets are lined up. I am only powering it with a power drill for now before connecting it to my 5hp engine. I also placed a 120v to 2000v microwave high voltage transformer on it, which leads me to believe that maybe there's just not enough…

The following website provides a comprehensive collection of links to audio/video courses and lectures on electronics and electrical engineering from colleges/universities. http://www.infocobuild.com/education/audio-video-courses/electronics/electronics-and-electrical-engineering.html The courses and lectures cover a variety of topics in EEE: electromagnetics, circuits and electronics, analog/digital integrated circuits, VLSI design, digital signal processing, digital communication, nanoelectronics, etc.

how do you calculate how many revolutions a certain motor will make under a certain time frame and voltages? Or how do you calculate how much electricity will be produced from a dynamo under a certain amount of revolution? Or how much energy will be produced from an electric generator under (certain) motion? I want to figure those things out but don't know how to start. (sorry if I put this on the wrong post;it just seem more suitable than all the other one)

Technology Robotix Society invites all robot enthusiasts to ROBOTIX 2011(www.robotix.in). Robotix is Asia's largest college level robotics fest held in IIT Kharagpur during its techno-management fest Kshitij from 28th-31st Jan 2011. Robotix 2010 was a success with a participation from over 450 teams with over 2.5 lakhs worth prize money being distributed.Robotix is set to return in 2011 with more challenging events and over 3 lakhs to be given away in prize money. We have autonomous, manual and online coding events for all robot lovers and coders. Our events this year are Pirate bay - This is a manual event that takes you right into the pirates' playground. T…

Hi friends iam in a project to replace the solenoid(5 volt) with a new device with low cost and to perform the same function(electrical input - mechanical output).kindly suggest ur ideas

in this walkthrough: http://www.explainth...istorswork.html it says: "the n-type has a surplus of electrons, the p-type has holes where electrons should be. Normally, the holes in the base act like a barrier, preventing any significant current flow flowing from the emitter to the collector" I don't understand why/how electrons flow/stop-flowing in this scenario. A - The language 'the holes.. act like a barrier'. if 'holes' are (lack of electrons/positive charge), doesn't that mean they are LOOKING FOR electrons (i.e. attracting them). How can they both 'attract' electrons but then also 'act like a barrier' / repel (those same electrons)? B - w…

Jordanian citizen of installing a new engine on a car As an alternative to the current drive ability than about 20 times the capacity of a traditional engine and reduces fuel consumption by 70 percent. The advantage of the engine which was invented by Mohammed Khalil Asendr small size, light weight and longevity for adoption on the "rolling" and the lack of friction between the pieces and reduce the rate of emission of harmful gases to the environment. The advantage of being free of the problems of cooling and lubricating the motor facing the traditional reliance on air cooling system four-stroke internal combustion according to the inventor. He told the Jordani…

http://www.luannei.com We suggest you taking part in practical realization of technical conception of the low-temperature thermodynamic cycle. The electric power station based on this conception will allow to double effectiveness of already built nuclear and geothermal power plants. Effectiveness of the suggested thermodynamic cycle surpasses effectiveness of engineer Alexander Kalina’s well-known ammonia-water thermodynamic cycle. Besides this thermodynamic cycle will allow to take the first considerable stride in fight with global warming.You can find the main technical principles of realization on our site http://www.luannei.com In case you are interested in rea…

new diagram.bmp The question im going to arks is what type of lenses should i use and what dimensions would it have to be to work efficiently. Also any other improvements i could make would be yourself

The scholastic aptitude of my son is in engineering and he's not known which is his preference. So I want to have some information about which engineering is good for getting a job.How about an electronic engineering?

guys, anyone uses PLS CADD software in here?

Does anyone know how big we could builds a torus colony. 600 miles across, 100 miles thick, built like a continuous suspension bridge, 1/4 gee gravity due to centrifugal force on the inside surface. Could we build this with current technology

Phones have several inputs: they obviously can receive certain wavelengths from the phone/internet/text network. They can also receive sound (microphone). They can sometimes receive GPC signals. They can receive visible light (the camera). They can receive touch signals (touch screen and buttons). They can sometimes feel acceletration, or know what it up and down. Special cameras exist that can see temperatures (IR), so that can be built into smart phones too. The phones have a processor which would not look silly in a desktop PC. They have a screen with a similar resolution as a television or computer screen. And the amount of apps for the phones is immense. Also, s…

How awesome does it look? http://news.national...630_600x450.jpg It's going to be sent to the ISS to do dull and dangerous tasks.

Engineering is a big matter, so some of the following sources of books may not have the specific engineering topic in which you are interested. If you are interested in computer and Mechanical engineering books, there are more sites than I listed. Out-of-copyright books that can be downloaded, including engineering books, are available at Project guru engineers, Google Books (choose the Full view option for downloadable ones), and Internet Archive. The ones providing books still protected by copyright, such as O'Reilly and National Academies Press, are not offering all of their books as free downloads, so you may need to browse the subject to find free downloadable o…