Engineering

Fluid flow is disrupted in the corners of square/rectangular passageways. The fluid tends to tumble in the corners. Can anyone tell me the name of this effect?

I was wondering if electromagnets could substitute gunpower. If you could have multiple with a charge on one spot, could a bullet be propelled forwards with the same effects. Possibly working like a tiny rail gun.

What is the meaning of hydraulic retention time (HRT) in anaerobic digestion?

Hi. Trying to find a vendor in USA and can only find a picture. Perhaps I need the correct terminology. Edited - added : It is used to expand hose ends and other whatevers.

There appears to be something in the natural environment , that steers a little bit away, from having an IDENTICLE COPY ? I think ? Even if it is a " round peg in a round hole " ? Thinking of Atomic Particles, Reproduction in living things ( plants and animals , ) . Not sure about microbes ? Even today's society forbids , outright plagiarism,( some difference required ), copyright infringement , etc . Is there BOTH..... An advantage. and. . disadvantage ......in having IDENTICAL THINGS . Clearly a wheel and axel need to have slightly different dimensions to function at all. * Perhaps there is a principle here? Not sure? Mike …

The attached youtube video shows a man moving multi-ton stones with sticks and stones, no heavy equipment. The sticks are mostly dimension lumber (e.g., 2x4s and 4x4s, IDK metric for these). For example, he lifts a 20 ton block several almost a meter (yard) by making two fulcrums less than a meter apart, and uses a teeter-toter motion of the block to lift one side and then the other one 2x4 at a time. He also plants one in the ground as a monolith. And rolls heavy blocks with ease. If the Egyptians and Celts moved stones with these techniques, it was easier than I ever imagined.

Hi everyone, I am trying to build a device hat requires a rather strong pushing force (500 gr. 1000 gr.) within a rather limited space. (9X15X25 mm) with an 8 mm stroke. This force would be required at full extension. Since solenoids, voice coils, latching solenoids etc. don't seem to be strong enough or have a long enough stroke length I thought taking advantage of the power of neodymium magnets towards an electromagnet. Supposing I'd be using a 9 mm diameter and 3-4 mm thick N52 neodymium magnet, could and electromagnet stick to it with a holding power of at least 500-1000 gr.? And will it be able to detach from it by reversing the current? hope someone can help…

I am a ninth grader at The Galloway School and for my science fair project this year have chosen to create a better hoverboard. The Lexus hoverboard intrigued me and I thought that I (or someone else) could make it better if it didn't have to use a track. This is my plan: Design Problem: One paragraph describing the problem a) what is the problem you are trying to solve or thing you are trying to improve b) why you chose it/why does anyone care/how is it relevant to real life You must have at least one parenthetical reference to your research here or in #5 Design Brief. I am trying to improve the Lexus hoverboard. The Lexus hoverboard is a board like a…

Hi. I believe I do understand the 'normal' magnetostriction, when transformer core materials shrink/expand mechanically with their exposure to magnetic fields, but have difficulty in how minute compressions/expansions may generate enough electricity to consider it viable as power generation. ----> http://earthtechling.com/2013/05/doing-wave-energy-with-no-moving-parts/ ----> http://www.greenpatentblog.com/2015/12/01/oscillas-power-bars-generate-energy-from-waves/ Light, please ?

Hi. Bought a property. It has a 1m diameter, 1m deep sinkhole by the front yard, 5m from the house. The concrete block foundation shows zero signs from being affected, not even a hairline crack anywhere. Neighbors from the area say it has always been like that. That when filled by previous owners, very slowly soil caves in. Do not know what 'very slowly' means. Guessing, takes a year or two to need refilling with dirt. There is a confirmed no relation with a mains water leak. Sewer lines are distant and PVC. No foul smells emanate. Terrain is very high in relation with the rest of the neighborhood. Could be said there is very little higher terrain around, bu…

So I got some ideas about ways to use 3D printing. To being with, let it 3D print a computer with all the available circuits and working structures like mother board and graphics card. Next, 3D print a factory of a large scale, it could be any factories and Chinese has a good example of 3D printing a house, just need some mechanical parts for the factory. You could also 3D print a 3D printing machine, the more the merrier. Lastly, 3D print a nanoscale factory for nanomachines.

Where can I find (and buy) relatively cheap superconductors? Thanks, Owwen

Hi, I recently watched part (the end) of a technology programme on CNN or the BBC. It was about a new fascinating, revolutionary "sci-fi" technology of "etching" an unbelievable amount of data onto an "indestructable glass(?) carrier. The segment was too short, so I can't be more specific. Has anyone heard of it and knows the precise term for this new technology? Have not been able to find anything on Google. Thanks! 'Mike the Fritz'

https://webcache.googleusercontent.com/search?q=cache:dII1QJHWYlUJ:https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19870001331.pdf+&cd=1&hl=en&ct=clnk&gl=ca Can mhd generators really be that efficient (70%)? If yes, why they aren't widely used yet? Which methods could be used to dissociate water molecules present in water vapour in mhd generator?

Have you ever touched an audio jack while it was connected to a speaker? You might of noticed that the current from your own body created electrical interference causing sound to be played out of the speakers. Did you know that if you rub the audio jack against your arm you might feel as if the audio jack is rotating? What a strange phenomenon! What if we could use that same technology to somehow feel a sense of touch in virtual reality? Let me know what you think!

So you guys know that there are cars which detect when it is about to bump into something like the Google car. Can we apply the same thing to humans? We know humans bump into humans at low speed is not dangerous, but if you are about to hit a driving car you'll wish that Google car mechanics is applied on you lol. Anyway, personally I think the output would be like a noise, since you can't really control a person to stop. Or a glasses that display message, or some mechanical force that would swing you side way, or make the car stop with RFID. I think this would be pretty cool This is the current Google self driving car overview. I'd say either implement the collision de…

Hi. The intake manifold in my automobile has a vacuum indicator that signals when to replace the air filter. Even my vacuum cleaner has one to signal the flow trough the collecting bag is impaired. I want to install an indicator to tell me when my central airconditioner / furnace needs filter replacement/cleaning. What would be a reasonable figure for the amount of vacuum at the HVAC blower intake to consider it restricted, in need of attention ?

hi; I have sent a letter to harvard and said them that I cancelled all considerations across this university. according to my contention the recommendation letter is quite fault requirement to make it mandatory. I respect everyone's ideas. But I strictly criticized harvard and cancelled the consideration. There exist some details. nature is in silence. as I understand they are willing to take articles from me. But I need economic support. this is unique necessity. I do not need anything else (MSc ,PhD any of these is not the thing which I am looking for.) because I believe I have ability to learn by myself at first and moreover ,while believe and I am willing to d…

wind power will play big role in future life right?

What is the required-to-determine parameters for the test of a water turbidity coagulant? And what are the standards for a coagulant practice?And what are the differences between compliance monitoring, performance monitoring, and control process in wastewater treatment? With references, please... Thanks in advance...

Dear all, Recently, I am performing a cultivation experiment that requires large volume of medium per sample. However, I am concerned about whether cultivation medium loss will affect experimental results or not. I'm not sure which strategy is better to reduce(minimize sampling loss) or increase(maximze data pont) sampling number. If you have any idea or related paper, please help me. Thank you.

Hello everyone, I'm currently in my bachelorassignment and have a certain problem that I need to solve. For this I would like your idea's on the subject, because all of you can look at the assignment with a fresher view than I can So if ur up for a challenge, this is your chance! Thanks in advance for all replies. off-pump coronary artery bypass graft simulator Assignment context: Bypass surgery on the heart can be performed in two ways, on and off pump. The off pump method is called: off-pump coronary artery bypass graft (opcab). This relates to the fact that no heart-lung machine is connected to the heart during the operation and the heart is still beating. Opcab…

Dear all, s weknow, the movable charger for smart phone has two ports: Input and output when we do the charging by plugging the socket with the input of the charger, light turns red to show that it is in progress When the charger is full, the light turns green What happens if the input and output of the charger are connect by themselves The light turns red as if this device is being charged with power. In fact, electrical power is being discharged We never see the light turning green. Instead, when the discharging ends, light is turned off. How do we explain this phenomenon?

Hi, please recommend me any article/book/any scientific reference talks about effects of wastewater on environment, and another talks about effects of drinking contaminated water on human health; because i searched but i couldn't find what i need for my research in environmental engineering. Thanks in advance...

Hi everybody, I've made this post to know if you could help me with some orientation. I want to develop a comparative analyse for two differents refrigerant for a cooling process (for LNG, criogenic process). The effective phenomenon that cools the natural gas, in the heat exchangers, is the evaporation of the refrigerant. The comparative analysis is suppose to compare the dynamic evaporation of propane, of a mixed refrigerent (composed of several compounds), and a mixed refrigerent with carbon nanotubes. If some one can recommend a book or a study work that have been done to start my research, I would be very glad ! Thank you Noel