Engineering

I do believe hydroelectricity has a great future and presently most of the industries are relying on it. Though i didn't had much knowledge of hydroelectricity principles before, but i found one very good article on internet below : https://www.scienceclear.com/hydroelectricity-a-massive-source-of-electricity-2020/ Must have a look!!

I am looking for single substrate inspection and/or metrology services for wafers and photomasks, does anyone have a recommendation? My company does not have the capital to purchase a tool. Thanks

I'm trying to understand what the perspectives electrogasdynamic generators could have. http://webcache.googleusercontent.com/search?q=cache:R6u9G8jzBIYJ:www.iaea.org/inis/collection/NCLCollectionStore/_Public/38/114/38114997.pdf+&cd=1&hl=en&ct=clnk&gl=ca http://www.freepatentsonline.com/3723777.html https://www.geographynotes.com/energy-management-2/generators/electro-gas-dynamic-generator-with-diagram-energy-management/4192 And have questions to those who understand the principles of their work quite well: 1) What are their efficiency, power density and electric current density limitations? What could be done to improve these par…

Right now, amid the covid-19 global pandemic and climate change and so much more, locusts are also decimating crops and amplifying starvation across the African continent. They’re everywhere and they’re hungry and people are hurting with hunger. What would it take to catch the locusts en masse / at scale and use then as a source of protein to feed the hungry? Essentially: Prevent them from causing starvation and use them to solve starvation. I’m thinking of something like a giant fishing net for the air, but am sure there are far better ideas (am not sure, however, humans can even eat locusts, but they seem close enough to crickets). Bonus points if any s…

Rather than people going through subway cars and busses disinfecting surfaces, have intake and output vents for each car. You attach a vapor hose to the input vent and fill the car with pressurized disinfectant vapor. After the virus is dead, open the output vents and remove the vapor from the car by blasting warm air thru the car, from intake to output vents. Any complaints?

Hello everyone! Copper tape is a thin copper band over adhesive tape, commonly used against electromagnetic interferences, seemingly also as a snail repellent. It used to cost a shiny penny for no reason, but the Chinese remedied that, check eBay and Alibaba. I should (I didn't try) be excellent to build antenna prototypes or indoor antennas, also outdoor antennas if protecting the conductors. Quickly assembled, modified, adjusted. Complete the contacts with the soldering iron. If the tape shall adhere on a flat item, then panel antennas, dipoles and dipole arrays, patch antennas, Uda-Yagi spring to mind. An optional second plane would constitute a reflecto…

So firefighters, when they need to get to a lower floor in a hurry, slide down a pole. They let gravity to the work, rather than their legs. I'm kind of left wondering; wouldn't this be a good alternative means of transport, to locations of a lower elevation? Rather than having a bunch of asphalt-paved roads leading from something high-elevation (eg. an airport) to something low-elevation (eg. a seaport) why not have; instead of and/or in addition; a pole or large slide that lets gravity do the work? Here are my two proposals. 1. A thick metal cylinder, that would be secured on each end, from which customers could put their arms and leg…

i need to regulate the air flow into an industrial oven ,and to do so : i have an asynchronous motor which i will connect to a frequency converter (excuse my english if i dont use the correct technical terms i studied and work in a french country ) and then regulate the speed of which the ventilator rotates .and this is where i need help i need to find the connection or the equation between the rotation speed of the propellers and the speed of air that s being propelled so that i multiply the latter by the section of the airway and finally regulate the air flow . ps : i know i can just use a sensor to calculate the airflow and regulate it directly but that is n…

What will wireless communications look like in 50 years? Is there any new ideas on how is it possible: 1) Reduce amount of the base stations (cellular towers) quite a lot. 2) Increase the data transmission rates. 3) Reduce radiation. 4) Increase the distance signal travels and reduce power consumption? Is it possible at least theorize that somewhere in the distant future we may have wireless communication with no need for the base stations and subsequently free of cost, basically?

Hi everyone! Rocket nozzles must be short and light but make the flow as parallel as possible at the exit. Further demands exist in the atmosphere. The eggcup shape answers that but needs numerical optimisation. The thermodynamic state itself isn't algebraic, and a single point takes an effort to a PC. Dozens of chemical equilibria shift with T and P, notably 2CO + O2 <-> 2CO2. Condensation and solidification over the expansion, typically of Al2O3, worsen everything. The heat capacity depends heavily on the temperature. And limited heat exchanges between droplets and the gas would be useful to model. One common assumption is that the chemical composition s…

Ages ago, I was fooling around with one of my 3d programs and I came up with this rather bizzare idea of making a hang-glider that would have the ability to produce its own power to keep airborn with a pilot. This attempt is alot different than a normal hang-glider though. The wing would consist of a flexible solar panalled core and would also consist of inflated cells, I figured helium would be the best bet, since its so light. The power from the solar panels would be directed into maybe an electric engine mounted to the pilots rear. http://homepage.ntlworld.com/mplayer/sglider.jpg It was just an idea, and I havent a foggiest idea wether it would be possibl…

Hello, I wish to select a spin coating motor based on the viscosity of various photoresists. Please share your experiences, or equations or sources where I may find the relevant information. Thanks

One of the significant factors in avoiding deaths due to Covid 19 is the lack of ventilators available as our health systems become overwhelmed. Here is a short read that outlines the problem. https://www.nbcnews.com/health/health-news/what-ventilator-critical-resource-currently-short-supply-n1168641 I put this in Engineering but let's not limit it to that. This certainly needs scrutiny from a biology perspective, and probably many others I can't think of. Any suggestions as to ways to mitigate this problem? Also why they might not work...that could trigger a thought that could work. I can certainly suggest ways to increase oxygen availability for…

i wanna focus on the simple wind of coil vs a coil with primary and secondary windings. Dont a normal wound coil already increase the voltage? What is the principle of step up coils with primary and secondary windings?(this isnt much clear to me) Why should I use the other over the other? Easiest DIY step up coil? goal voltage is probably atleast enough volts to make a spark gap Additional: since voltage is means pressure, meaning, can I increase voltage to discharge much faster or it still depends on the discharge rate of the source? (think of it like pouring tons of pebbles on a really fast conveyor belt)

I was about to sleep last night, and i wondered, how much energy does it take to produce uranium needed vs the total energy production of nuclear power plants (regardless of energy used to construct the whole fascility ofc)

So, im looking for maybe paste, or a pad, or a liquid that can conduct heat very well and doesnt let electriity to pass through. Any material/brand/or whatever out here that can achieve both at the same time? I was thinking of thermal paste (for computers) but they are electrically conductive as well.

My ac stabilizer is showing its terminals either both hot or both Cold.what could be the problem?

is there a way to physically store electrons with our current technology? I dont mean using chemicals that have charge in them like batteries, i mean extracting electrons and storing them in a storage, and ofc when the storage is opened, it just shoots out or flow through (if wire is connected), which i imagine would happen

Hi I know how magneto ignition works, like how it can create the electricity and the high voltage, but what I don't know is how it can control so that it happens fast in pulses. Can someone plz explain to me how this works? https://science.howstuffworks.com/question375.htm

What do you think about perspectives of MHD generators to replace ICE in series hybrids as a range extender? May it ultimately happen?

What started off as my politically-motivated blog (url deleted)last week, I've since been elaborating on, in an engineering design style, so I thought I should get some professional help. 😉 BBC: “Falling ice causes first Queensferry Crossing closure” Keeping such bridges open even in icing conditions is really not rocket science. What, to me anyway, is the obvious solution – to pass an electrical heating current through the bridge’s support cables – doesn’t seem to be “obvious” to other research scientists and engineers whose “Thermal Systems” for melting the ice are reviewed here. I suggested this simple solution, outlined the calculations required and warne…

Heating foodstuffs in a domestic electric oven is best achieved under conditions with an even air flow to spread the transfer of energy, typically using a venting system with a convection fan. However, could the same not be achieved solely with an internal fan to radiate the air inside? If so, then it could negate the need to puncture the internal membrane of the oven with fan and ventilation access, as a magnetic stirrer system could be employed to circulate the air. With an electric system there would be no need to worry about ventilation of gases as well. One issue could be the temperatures themselves, as I understand that magnets degrade under heated condit…

I would like to be able to passively project a humanly recognisable object over a dense array of fibre optic cables, over a distance of 100m, without the need for electricity. 1. To project more detail than a silhouette, light projection onto the object itself is required. Could diverting some of the cables toward a natural daylight source be used to sufficiently illuminate the object from a distance of 5cm? 2. If so, what percentage of the cables would be needed to illuminate an object 5cm away e.g. every other cable? 3. I assume that the array of cables is capable of transmitting the image distortion free if curved with the minimum bend radius of an fibre…

I have only read about liposome on webpages such as url deleted , but thats the only company i know, which is working on this. Do you know more about this product? Need help!

Assuming the surface to be a mirror reflection(theta1 = theta2). Need an equation when varied the incident angles we would obtain the second reflection angles or a method to do so. please view the image for better understanding. The pyramids are equally spaced of equal height and equal base length and same level(can also assume more number of pyramids in the x and y directions making z to be the height). The angle of the pyramid can be a assumed(like 60 degree). The given data is the first angles of incidence and reflection(assuming mirror reflection). the unknown value is the second angles of incidence(forming or derived from the reflected or scattered) also as…