Engineering

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

Hello everybody! Flywheels have been used for long to store energy. Doing it at the scale of the power grid or even a fraction of it isn't common, and they want to: http://www.popularme...ry/4337758.html but their wheel of carbon fibre is (too) expensive, and I suggest steel instead - very strong steel. Maraging steel is too expensive, but a disk of dirt-cheap S960MC could rotate at 412m/s+20%. Better yet: spring steel. Cheap silicon makes it martensitic (the aim of quenching) at any thickness. At 1200MPa only, a cylinder can rotate at 555m/s and a tore at 492m/s, storing much energy. Because spring steel stays martensitic it can't be machined in a softer a…

Hi. The hydraulic fluid from a pump outlet can compress air to easily 2000psi if fed to an air containing vessel. Is there such animal in the industry ? -Yes, it is easier to just use an air compressor method-

Hi, i am a junior student doing a research to take part in a world competition, a very important chapter of my research paper depends on gases separation to benefit from each one at a time, i searched about gases separation techniques but i found most of them very expensive and complex. Lately, i found out a method depends on an electronic device that separates gases according to their different densities under high temperature amounts to 1200 C in a closed system. Please could any one recommend me a book/reference/research paper/any thing explain me this technique or any thing explains gases separation by density in general because i strongly need it. Thanks in advan…

Hi everybody, I would appreciate your thoughts regarding a newly developed security system for detecting damages to an object. It uses an optical multi-layer system to identify security breaches. For details check out: http://www.avalanche-research.de/projects/5765b30a11af4c0300a0f814 Best regards

Ultra deep hydroelectric/geothermal power plant By Physicist Wolfhart Willimczik ABSTRACT This invention consists mainly of a long sloped tunnel, a deep hydroelectric/geothermal power plant and hot rocks transforming water into steam. Advanced tunnelling machines are able to reach lengths and depths never possible before with the old drilling method. The drop height of the water for the hydroelectric power plan is for instance over 10 km and the gained water pressure over 1000bar feeding special high pressure water turbines or big hydraulic water motors driving again generators. After passing the water turbines the water is pressed with a rest pressure of …

It has been suggested that a strong enough cable (carbon nanotubes?)should enable a space elevator to be built. However, surely, as the cable is lowered from space there would be a static build up so great that when it discharges close to the earth, it would be like an atom bomb? Also the cable would be like a super conductor and transfer earths heat into space. Another ice age anyone?

Dear community, Please let me know if this is the wrong category. I have been working on a device enabling to characterize the Max Power Point (MPP) and Fill Factor (FF) of solar cells by applying various loads to a solar cell and extracting the current-voltage curve. Now it is time for the experiment itself. The idea for the experiment is to determine the FF of, say 10 cells under real sun irradiation, under sunny conditions. The parameter which can (strongly?) influence the results is that the conditions of real sunlight irradiation are highly unsteady: the proportion of diffuse and direct irradiation can vary significantly within minutes or seconds, influenced even …

Ok, so I did some reading on the fourms before posting this and uncovered an old thread regarding air gear. This caught my interest because as a part of my Network Administration classes I'm taking Human Hardware Interaction as an elective. As a thought for the project I was thinking about trying to make my own set of Air Gear. Now, I know that someone pointed out the video "rocket skates" on youtube in the post I found. However, to simplify the use of the air gear I was thinking that I would somehow fabricate a sensor pad to detect the pressure of how a person uses the inline skates. As an example I will use the way I skate; when applying pressure to move forward I…

Hello, I am part of a small team designing a biologically-inspired underwater robot. The idea is that instead of having a traditional propeller design for the robot, it will instead propel itself in a manner similar to a cuttlefish (with fins on either side pushing it forward). However, before building a full prototype, I would like to know how well my robot will be able to propel itself in the water. My question is this: Is there any way I can accurately predict the amount of force my robot will be able to produce, either through simulation software or calculations? Any help or information on the subject will be greatly appreciated. Thank you, Mark A

PLEASE! what do the E, M, A's and ponying vectors look like when a permanent magnetic dipole has one half of its body (pole) charged + like "N & +" and the other half "S & -"? and then importantly whats the other orientation (N-)&(S+) behave like.. (just to make sure im not missing anything;) and what happens to a dipoles flux when its placed in the center of a large permanent toroidal magnet.. does the A field curl all its flux? thanks!

The more complex something gets it seems to me the more likely things are to go wrong. I once heard that the Space shuttle was the most complex machine made by man. But if we had the technology could we build something as complex as The Star Ship Enterprise? I was looking over a cut away picture and it occurred to me that there might be a real limit on how complex and reliable a machine can be... This video is very pretty, and makes my Treker Heart jump with Joy but could such a complex machine really be made?

So I was researching something for class involving air as a fuel source. I then read up on multiple things and had an idea for a car. What if: You extracted the nitrogen from the air, made it into liquid nitrogen, and then used it to power a car using this: http://www.planetforward.org/media/tv-segments/can-liquid-nitrogen-be-used-to-fuel-cars. Don't mind this formatting, it's quite late at night and I'm too tired to care.

Me and my partner received an extremely important assignment that will occupy our entire semester, but we don´t have no idea how to start it. Basically, we were asked to find an article regarding physiological processes so that we can model it using Matlab, but we can´t seem to find any article that includes graphs, differential equations, with no partial derivatives. Any help on finding an article meeting this requirements would be greatly appreciated.

I am cutting corners again. I'm building a single stage rectifier 15kv in 30kv out. I don't have the budget for HV diodes so I connect 20 1000v diodes end to end (7ft long) for each diode in my rectifier. Seems to work. I haven't measured with a divider and a voltmeter but the gap discharge measures about 1.75cm. A little wider than my calculated Paschen estimates, possibly because of a Corona effect. Anything I should be conscious of or worried about as I continue? I plan on adding more stages and I'm curious if I'll get more waste in later stages using this diode method?

Hello, I was wondering if someone could help me diagnose a problem with a 220V, 1000 VA automatic voltage stabilizer/regulator. It's a relay-type, containing 5 relays. Usually, when I plug it in with no load, one relay (or more?) starts clicking non-stop, while the output stays steady at zero volts. Sometimes, the clicking stops after a few seconds, with the output still being 0V. Very occasionally, the unit will work properly when I plug it in and load it up with a floor fan, maybe ~40W (I haven't tried anything heavier on these extremely rare occasions). Any ideas for me to try out? I would say that I have maybe an intermediate knowledge and ability when it come…

Hi there, first time posting. When using an infrared camera on a corroded (heated to 100 degrees) steel beam with corrosion pits, the image shows a minor difference in temperature between corroded areas and non corroded areas. The rust that developed was removed before the experiment. I wanted to know the theory behind why corroded areas of steel show different thermal properties. any ideas?