Engineering

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…

to get the diploma i must do a final project the subject is renewable energy. Im not shore if my idea is going to work so would you tell me if it would and also ideas about how i can improve it. im also wundring what liquid i should use to make it work the best. the document is a word 03 one so it should open thanks for taking you time to look at it and i hope you have some ideas on how i can improve it diagram 03.doc

Fusion power has always been deemed impossible, or at least difficult, because it is very hard to keep the reaction self sustaining. However, I have figured out a way which I THINK might work. Inside of a fusion reactor, have a uranium pellet with fusion fuel inside. As fission occurs, the pressure and temperature inside of the core will be enormous. This will result in fusion, releasing a neutron to further bolster the fission reaction. This will raise the temperature of the entire core with less fuel, thus becoming a more efficient method of power generation. What do you think?

I'm trying to find a directional emitter other than a coil. I realize I can just shield one side of the coil and aim it in the desired direction but, I'm hoping to find something more directional and focusing. If I use a coil, I'll simply use a cap and switching diode but hopefully there is something better......

Good day, Our lecturer give us an assignment on renewable energy, he want us to design at least one method of harnessing power from the ocean which still do not exist. So that's why i attached the picture and hope a +ve comment from you guys. Thanks in advance p/s: sorry about the mark at the bottom of the picture, i'm in hurry actually

I might have titled this wrong. but I know some one in the engineering field has the answer to the material i am searching for. I am trying to find the name of a material that will hold water, but will allow me to penetrate it repeatedly with a syringe. When I say gasket, it is a lose term. I want to capture water or a liquid that will not be toxic, inbetween two pieces of this material, while being able to reach through both of these materials and liquid and extract substance with a syringe on the other side. The substance is small, about 25 microns. And since it will escape anyting that is not air tight, I am attempting to create a water gasket so to say. please give me…

haloo all here is my question " Why few capacitors are engraved with polarity and they get blast when i reversed the polarity of supply potential whereas few other capacitor will work in AC too ?" Thanks in advance .... by non LINEAR+-*/

I'm not smart in these area's but would it at all be possible to use water source heat pump technology to drive a steam engine and where the energy source to drive the heat pump would come from solar energy? I ask because I think it would be a possibility to design seagoing cargo vessels to run on this principle where the entire hull would be covered in solar panels and the consistent temperature of the ocean would be the water source. I also thought it would be interesting to use a sealed engine which ran on liquid nitrogen where the power was gained by the steam pressure because liquid nitrogen boils at below room temp. In this design the water source heat pump…

Hello, I am looking if there is a material that has variable thermal resistance as its temperature changes. Please refer to the image below. I am trying to find a material that as heat is added to the outer surface, the inside surface can only reach a desired temperature. So in a sense, the material regulates the temperature at T1. For example: if the outside surface temperature, T2, was at 80C then inside surface temperature, T1, would be held at 60C at steady state. Thanks, Andrew

Soon, U.S. tanks, APCs, etc, will be equipped with defense capabilities such as this one: http://spikedhumor.com/articles/53036/Anti_RPG_System.html (if it doesn't show, reload the webpage, sometimes there is an ad in place of the video and you just have to reload the page) I'd like to devote this thread to discussing the future of warfare. I think that in the nearterm, conventional weapons, along with some new toys such as sound-based weaponry and lasers, will continue to dominate. Remotely operated or AI-operated tanks and planes will replace manned vehicles. In the not-so-distant future, I expect nanobots to take over the role of defending (and attacking!).…

Hi, I'm thinking of constructing a miniature of a coal power plant for a school project to explain in practise and detail how it works and why it is a innefective method to produce electrical energy with. I'll use reliable methods aswell as material in my working process which will be oversimplified towards realities coal power plants. But before I can get started I need help with my planning and eventual issues that might arise. I'm thinking of using the following components in eneral to my coal power plant: Steam turbine (Probably I'll build this my own if I can't find one in the right size, maybe a tesla turbine?) Electricla generator (Have one!) Pol…

Hello All here is my question " Why DC mahchines are laminated at the pole shoes ( for large power machines poles also ) and Servos are laminated poles and yokes also ?" and i heard lamination in transformers is done to reduce the Eddy current loss......;\ Expecting much friends to reply here ..... Thanks in advance ... by non LINEAR+-*/

This is a recent video: ---> Real life size boats have been built : ---> Can run on any direction including directly against wind

As part of my ongoing pursuits I have contemplated locking down the designs for an oscilloscope! Despite pressure towards more rational goals made by my superiors I am looking at a design expectation of 100GHz. The first step I have taken in beginning the design process is to find a micro-device that a design could be implemented around which serves as the primary device for taking measurements. After some investigation I have found that Analog Devices produces a device that can operate at 10GHz and is moderately priced and will meet design budget. Originally I had wanted to scope for a 128bit bus for detailed card and board analysis but this would be a project far ou…

What happened to the gadolinium refrigerator that seemed promising about ten years ago, has any improvement been achieved ? What is the current status/progress, does anyone know ?