Engineering

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…

Kohler the company produce a simplistic perpendicular designed outlet, flush from the wall, which produces a crystal clear jet of water for use in the domestic bathroom environment: https://www.faucet.com/kohler-k-923-polished-chrome-modern-wall-or-ceiling-mount-bath-filler-with-95-inch-2-4-cm-orifice-from/f231619 I would like to know how much control could be had from a static system regarding where the flow would finish? I understand that there are very strict principles to be observed in order to achieve the Laminar effect and it doesn't seem like there would be much room for manoeuvre with this design i.e. only on and off? What if the water were a widened sh…

I apologise in advance for any of my ignorance. my question is could you use gyroscopes in counter acting orientation to either make a space anchor or use it to detect gravitational variation? I understand that it would use a lot of energy input for fairly small output but could it be done? it would have to be done in a very low or almost zero gravity environment As gyroscopes like to stay in place on it axis when spinning, using the end of the axis as a resistance force. Could these be counter balanced in such a way to provide stability of movement in space where nothing can be physically touched. not sure I’m explaining it right, so ple…

There are a number of things for which "bacteria-laden, but not salty" water are still useful (farming, spraying on forest fires, etc...) and in some places, like California, far more of the state's clean, treated tapwater goes to such uses than to direct ingestion of said water. Conversely, I presume there are things for which saltwater could be useful (bathing, spraying oneself with it as an alternative to air conditioning) that bacteria-laden water would not. So what I'm wondering is... would it be practical to have 2 or 3 different sets of water infrastructure, for 2 or 3 distinct purposes, as an alternative to one single one? For i…

I know that solenoids are basically electro magnets with a coil around an iron core. So, what makes a solenoid push or retact harder, higher volts or amps, or both (watts)? and if not both then what do i do to make one push really really hard? Also, how little electricity do piezos produce if i just use ambient noise to generate electricity from it?

Hi. Planning to extend coverage of the back yard with ~40mm high gravel for an area automobiles park. Already did a section using about 25 mm sized gravel; the quarry has finer sizes, like 12 and 8 mm. Which should provide better traction? There is a mild slope, like 5 degrees. Gravel goes on top of polyethilene film placed over the soil (to prevent weeds from poking trough).

Mostly for fun, I would like to try annealing some small steel pieces (say, half inch size or less). Tips? What would be most easily obtainable tools to do it? What kind of torch should be enough - or should I build a wire heater? They say: soak it at correct (red-heat?) temperature for some time (seconds, minutes?) and then slowly (how slowly?) cool it down. I guess such small peaces would cool to quickly in air? Some internet guys also say that you should not heat it too much (orange). I don't understand how can this be a problem?

Hi, I began working at a new firm recently where I am managing the chemical waste. Before I got here it was mentioned to me that a liquid had pooled in a containment bin. The cleaned it up, but formed again later, so I cleaned it up. Its a coated metal cabinet (exposed steels getting fairly rusted) containing HCl, HBr, HF, H2SO4, etc pretty standard stuff. It also contained H2O2, which supposedly vents oxygen, has anyone ever had this problem or can think of a reason? Thanks,

Hi. Can you suggest which jobs of what branches will have less chance to be wiped out by artificial intelligence robots ? Please do not mention politician... 😧

Hii. Today i just saw a videos where it says that, we found a planet where the Translation and Rotation are syncronized so it means that at one side is allways day and the other is allways night (like our moon that is always facing the earth) so i was thinking how a city in the night side would work and i loved it, and after i thought that it would be possible to do something similar at the day side as well artificially created day and / or night environments note: DaN means Day and Night hypothetically speaking I believe that there would be places where it would always be during the day and places where DaN cycles would be created. such as: apar…

The Hydrogen powered jet Hi My names Darren Cronin I live in bristol and want to help with climate change. if you think there might be something in this idea please pass it on. The one problem with a hydrogen powered jet is the fuel (hydrogen) would have to be stored in a large pressurised or cryogenic tank inside the aircraft utilising the space required for passengers where as traditional aircraft store jet fuel in their wings. My proposal is a radical idea that traditionalists might scoff at but hear me out. We have to come up with an alternative to jet fuel, the environmental costs are building! Hydrogen is the obvious choice as it burns even more e…

Anyone know a formula for how big a hole can be yet still keep water suspended in an otherwise sealed vessel, factoring in surface tension and atmospheric pressure?