Engineering

I have a liquid mixture of glycerol (GLY), water (H2O) and tetrahydrofuran (THF) solvent. The weight fractions are about 66.41% : 21.88% : 11.71% of GLY : H2O : THF. What distillation methods are best to separate these liquids into their pure components. I would like GLY to be >99% wt. pure. The H2O and THF each can be > 95% wt% pure. Would simple distillation work?

Hi everyone pls help me with this... How does a magnetic compass works..? added, is it pointing to geographic or magnetic poles of earth.

My knowledge in electronics is limited. In general, the television remote use IR for sending signals. I would like to know if the same signals can be transmitted using bluetooth. If so are there any disadvantages in using bluetooth technology in television remote? Regards

I'm building something requiring a heating coil that hovers at 500-600F and quickly jumps to about double that, sustains the high temperature for 1-5 seconds, and then drops back down to the original temp. How do we get the temp to double extremely quickly? I'm thinking we just make the high voltage for a temperature that is WAY higher and it will reach the actual desired high temperature more quickly, but I don't know whether or not that will work.

I would like to see if it is possible to mix two signals with one transistor: I don't have equipment to test it but would like to know at least theoretically what could I expect: I want to mix two signals and get some kind of mixed output, it doesn't matter how they are combined, just a random mix of the two signals. So I though about injecting a signal into the Collector, a different signal into the Emitter and see what could come out of the Base terminal: I expect a very weak signal obviously since I am using the transistor not really as an amplifier but as some kind of mixing signal system, but the weak signal should be some kind of mix between the two signals inje…

At work I started a course about vibration sensing but unfortunately the first half an hour i wasn't present. a question I was wondering about was ''why would you need to determine the vibrations in the conservation of Pre-Historic temples?'' I mean, does vibration (even the slightest), affect building and/or artifacts in any way or another ? thanks.

I am trying to convert British Units into SI units for a heat transfer coefficient. My worry is the time in the british units (BTU/hft^2 -F-). The SI unit for heat of transfer does not have any time in it (W/m^2k). I tried converting W into Nm and then N into Kgm/s^2 and we are left with (Kg/s^2 -k-) but this does not relate to BTU in British units. If someone can show me how to get time into the SI units or tell me that it is not relevant I would appreciate it.

hi, i'm trying to build something electronic but, unfortunately, my knowledge of electronics is naff and i am getting incredibly blagged and confused trying to figure out how to do this on the internet. what i am attempting to do is create a circuit which converts a 4.5v DC power supply to a 50Hz 39v AC power supply. if you could provide simple instructions on how to achieve this i would be most grateful. (by simple i mean the names and specifications of the components i need and how to connect them. nothing more, nothing less, otherwise i will get confused xD) your help would be much appreciated, thanks.

As the title suggests; would rear wheel steering (in a car) make cornering easier/safer/faster? This question is someting I've been pondering for a while. Having driven front wheel, rear wheel and 4x4 vehicles and sliding them around a bit on public roads for fun whilst no-one's looking, I've often wondered how a car would behave if it were rear wheel steering. Presumably, having the rear wheels drive and steer the car would result in a little over-steer, rather like the effect you get when performing a J-turn in a front wheel drive car. A front wheel drive with rear wheel steer might behave more like a boat or aeroplane with it's rudder turned hard a-port/starboar…

I am Designing my own car and am trying to make it a rear motor design, anyone know about clear schematics, or videos about the motor, drive train, tansaxel set-up? I looked around on the internet but couldn't find any. Anything Would Help! Thanks!

I am making a game, and one of the things involved is the city of Atlantis. As Atlantis is overused, I decided to make it different. So, in the game, Atlantis is a hovercraft city that flies around the Mediterranean. How much energy would it take for a modern-type city of about 3 mi diameter to fly about 50 feet above the sea level? Using, say, a Hydrogen power plant. Assuming it is made of an incredibly light material and is about 100 feet tall. Also, if it sank, how much water would it displace? I need to know that so I can remap the Mediterranean sea for an area with much less water.

Hi there, i'm new to these forums and i'm in need of some help regarding magnets. I'm working on a project with the saddlebags on my motorcycle and i have created a separate partition inside the first one before moving on to the second. What i want to to is, if possible, have the partition held shut/closed by a regular magnet being attracted to an electromagnet that's NOT turned on. The idea i have is that when i run power to the electromagnet, it'll repel the regular magnet and open the compartment and when i cut the power off then the regular magnet will be able to be attracted to the electromagnet once again and close the compartment. Is this possible and could so…

All the vehicles (4 wheelers and sometimes 2 wheelers) in the market today possess various engine maps in the vehicle's ECU. There a number of maps related to vehicle top speed. However, all the data in the vehicle's ECU is not rewritable (not sure about this info). Can any one confirm me this info? Also, if I want to redefine the vehicle's top speed at the push of a button is it possible to perform this function? I hope my question is bit clear. Regards.

I'm attempting to extract some additional heat from an existing fireplace and wondering if anyone can help me with the rate of heat transfer from air through a copper pipe to water. Here's what I have....a fireplace with two chambers outside of the firebox where air can be blown to other rooms via duct work. Rather than blowing air, I'd like to install a copper coil of 1/2" flexible copper tubing and heat water to pump through my in floor tubing in the basement. The question is, if I have 40' of 1/2" copper tubing in the chamber with water flowing through it at a rate of 1-3 gallons per minute (if I set my pump on low speed and only open 1 of 4 loops in the floor …

Hi, Forums. I'm a 3rd year student in Bachelor of Computer Science. I have some queries and would much appreciate if you could help answering them. 1. What are the available Master degrees in Engineering to BCS students? 2. Is Information Systems/Technology Security Engineering accepted as an engineering field? Would the student who finishes the course in the Master Degree be professionally accepted as an Engineer? Thanks, any advice or comment is much appreciated.

At the office I have a few air tanks that combine for a volume of roughly 1200 cubic feet. They are normally used for the storage of 3000 psi air (Note: When I say they're 1200 cubic feet, I don't mean that they hold 1200 scf of air; I mean that they have a combined volume of 1200 cubic feet.). In any event, despite the use of air dryers, we get condensation in the tanks. This is bad (mmmkay?). What I'd like to do: Periodically vent the tanks and then pull a vacuum on them to force any condensation in the tanks to boil off thereby drying the tanks out. Early in the process this should be easy, but as the vacuum hardens (read: pressure reduces to < 0.5 p…

Thought this podcast may be of interest to you guys. It's from Boise State's (where I went to school and work with now) Beyond the Blue program, which is a podcast series that spotlights various academics from the university. This one is from Amy Moll, who is a professor of material science and engineering and she was also involved in PBS's Nova: Making Stuff documentary series. You should check it out: http://beyondtheblue.boisestate.edu

So I managed to make a metal rod into an electromagnet. I used speaker wire 18 gage. For power, I used a dc 24v 1.2A transformer. success it worked! After about 60 seconds the I could smell the transformer. I pulled out from the outlet and the transformer was smoking. What should I do to prevent this? what is the best way to supply power and not have over heating?

Continuing on from my previous post about this but pursuing a different method....... I have decided to have a go at making a water cooling system. My idea is to use a piece about 2.5 inch diameter copper pipe to make a cylinderical water filled chamber, i.e. silver solder the ends shut with sheet copper with an inlet and an outlet at the top. Would generating turbulence in the chamber result in better heat transfer into the total volume of the water in the chamber, i.e. as in stirring a pot of water on the stove, or would it be better to generate a venturi effect in the chamber, i.e. with a flatter chamber?

I've heard that when fiberglass is cut with regular saws, etc., it tends to crack and chip. Is there another way to get a better cut on this? I have a fairly large sheet of Plaskolite that I'd like to cut into a variety of pieces.

With all the power behind tides and currents, there has to be a way to efficiently harness this power and put it to good use. How would it be done?

hey need some help.. anyone can give some details regarding the design parameters of a vortex tube. Any established method of designing it .

Would the following set up work as an effective cooling unit...... Copper plumbing tube heat exchanger inside a PC case that is getting quite warm. Copper plumbing tube heat exchanger outside the PC case. Connected via platic tubes to a sealed reservoir with small pond pump and household ammonia and the reservoir can be partially evacuated. The idea being that the ammonia will boil out of solution within the heat exchanger inside the PC case and then re-dissolve as it gives up its heat in the second heat exchanger. Depending on how good a vaccum I can generate, some of the water might boil off too.

An idea that may break through! I suggested there (but there were already developments, at least for disabled persons, if not for every computer user) http://saposjoint.ne...php?f=66&t=1477 to track with a camera the eye position of a computer user and let software deduce where the user looks at. Then, special keys - I'd like them at the keyboard - would tell what action to start with the object looked at. This is meant as a pointing device to replace mices, touchpads and other trackballs. Meanwhile (or had they started before?), the Swedish company Tobii develops such a pointing device http://www.futura-sc...les-yeux_28435/ resembling my description. …

In all different kinds of Sci-Fi we see or read about people taking sonic showers. They would be amazing, just step in, hit a button, and 5 seconds later you are clean. Imagine how much water we would save. The only problem is, how would somebody go about creating one? Any Ideas?