Engineering

Hi. I am doing some experiment on finding the electrical characteristics (surface conductance specifically) of a particle which is then attached to different amount of DNAs. The whole aim of this experiment is actually to analyse the sensitivity of this new found method of detecting DNA, but I don't think I need to explain it in detail for this particular problem. Now, this zeta potential is crucial because it's needed to calculate the crossover frequency of the DNA-attached particles. Crossover frequency is the frequency at which dielectrophoresis force is 0 (neither positive nor negative). After measuring the zeta potential of the particles, it was found that the zet…

hydrogen seems like the perfect alternative fuel its super light and more explosive than even gas. and when hydrogen is burned it recombines with oxygen to make water. so its powerful and has no bad air pollution. electric cars have big batteries that have harmful chemicals there too heavy and you cant go vary far. so why haven't we switched over to using hydrogen engines?

Hi I have a question... Is it possible to create a electromagnetic field that has enough force to separate substances in a heterogeneous substance?

It is proposed to produce Units of Energy / Fuel called FORCE CELLS ! Each of these cells hold a Unit of Mechanical Energy. It is designed as a Spring which can be wound and unwound or Compressed and Decompressed. Any of the above may do but I prefer a linear tensile wire which can be wound up and locked and when touched on a point opens out and produces a direct CIRCULAR FORCE for Automobile Motoring !! Like the Clock Spring. Therefore the Car will be built with an Engine which takes in a stream of Fuel Cells from its Tank / Stack and have a Carburetor / Integrator which arranges these Cell on a platform which with one trigger will open out all the Fuel…

Hello everybody! Staged combustion lets one propellant pass fully through a pre-chamber (or gas generator) at high pressure, adds a bit of the other propellant to burn it partially to a moderate temperature, and pass the big flow through the turbine. This gives more power to the pumps, and the higher pressure in the main chamber makes a more efficient engine. I've much simplified my obscure sketches here under; the reader may imagine in his clear mind: Each propellant passes first through a booster turbopump. A second impeller brings only the small fraction of auxiliary propellant to the pre-chamber pressure. This saves power, the gain is notable. A propellant flows…

Hello everybody ! Some experiments (clocks, atom interferometers, tests of satellite parts...) must run under zero gravity. Among the methods: Space station - Back seat on a satellite - (Small) own satellite Seat on a launcher's side booster - own sounding rocket Parabolic flight aeroplane Drop tube. A drop tube provides among the best microgravity quality if not the longest. It's up to 150m tall, evacuated to eliminate the air drag, and the experiment drops through it for 5s, or 10s if it's thrown upwards from the base http://en.wikipedia.org/wiki/Drop_tube http://de.wikipedia.org/wiki/Fallturm_Bremen that's unusual engineering and I hope you find it puzzling too. -…

Hi, This problem has been driving me mad! Can anyone simplify the physics of this problem? Because I can't solve due to to many unknowns. Question ref: Engineering Materials, Benham, Crawford & Armstrong. Please refer to attachments.

3D priniting technology seems set to revolutionize the way we live and will impact fields as diverse as food and automobile ancillaries. Will this technology ultimately provide us with real organs available for transplant ? Please opine.

Hello! I don't know if this is the right place to ask, but I wonder if its a good deal use stirling engine for energy production in a small-medium farm. Thanks for the response.

Hi, is there any one can tell me what is the name of chemical name of green phosphor screen? Used on Night Vision Goggles and CRT monitors, oscilloscopes.

I am a Engineering college student working on a weather balloon project, in which we are hoping to launch up with a camera on board to try reach the stratosphere. The idea of the camera is to capture footage and images on its journey. Does anyone have any advice on materials to use for this project? As we will only have a limited budget to work with. Or any other tips and advice on this project if anyone has done it before?

Is this basically how Wardenclyffe Tower was suppose to work

Hi all. Trying to make/modify a magnetic compass. I should be able to attach a ~4mm mirror to the pointer or disc. The orientation of the mirror should be rotatable, by moving a dial or mechanism that will not impair or interfere with the heading. In other words, a mirror on top of the disc center, facing -say 135 degrees and reposition it to -say 170 degrees. Seems a dry compass, disc type instead of pointer or wet type would be preferred. How would you handle the repositioning mechanism ? ======================================================================================== By the way, how did compass got its name mixed up in English with the…

If you had two tanks of relatively similar PSI (one slightly less than the other). Would the compressor needed to transfer gas from the lower PSI tank to the higher PSI tank simply have to raise the PSI to above the higher tank PSI to transfer gas. Basically would a weak compressor still be able to get the job done? Seeing as it only has to comparatively raise the PSI a few points? I ask because I was thinking in terms of robotics. If you used compressed air to actuate movement, could you use two tanks to achieve this. Have one tank as the primary (with the larger PSI) and another slightly lower PSI tank as the secondary. So when you use the higher PSI tank to mov…

Hello, I am making a project on development of parachutes. I would like to know what happens, to a descending parachute when strong winds act on it .., in detail the parachute is a primitive one..(like the ones used for airdrop) can someone please help me in this topic.. Thank You in advance..

3D printing is an awesome modern technology, currently most used to create small figures or miniature designs. Since it can only construct relatively simple structures, it's understandable why you can't 3D print cars or electronics or anything complex. Still there is one thing I can imagine 3D printing doing today, granted a large enough printer was to become available: Creating buildings. This might be possible because first of all, buildings are made out of few materials... typically just steel plus cement (reinforced concrete), both of which can be molded in place. And second, they are very simple designs... just a few wall patterns repeated across floors, with hol…

It's almost that simple. Picture a self inflating balloon made of cellophane. I have a chemistry question regarding some very basic principles. The materials involved: cellophane, acetic acid (6% vinegar), and sodium bicarbonate. The goal: For a 6 liter cellophane sack (balloon) to be filled using the CO2 produced from the reaction of acetic acid with sodium bicarbonate. The entire process must contained within the cellophane sack. Diluted acetic acid stored in an internal bladder within the cellophane sack is physically ruptured to expose it to the sodium bicarbonate, also contained with the sack. The entire process must be relatively safe... such as only minor …

Hi everyone! I am a student of economics in vienna and currently working on a project together with CERN, in which we want to find new (civil) applications for a new sensor, they have invented. In a first step we want to find out the benefits this new sensor delivers. Just imagine a CMOS sensor with a thicker depletion zone than ordinary CMOS sensors (as used in digital cameras), which makes it capable of detecting X-ray, infrared and even single particles (the main feature, why they developed it). It has also increased radiation hardness and can be used in magnetic fields and in vacuum. Can you think of any benefits this new technology could deliver to users? (don't h…

I was asked to explain this comment I made in another thread, but since discussion would be off topic there I have started this one. I'm sure I have missed many obvious thoughts so comments from Engineers would be welcome. Paradoxically engineers use centre lines both because something balances about the centre line and because things are irregular about the centre line and for other practical reasons as well. Working through my examples 1) If we drill a hole or bang a nail in we want to mark the spot where to place the point of our drill or nail. This is at the intersection of two centre lines. 2) So let us say we are going to drill these holes to bor…

Greetings everyone. If you happen to be reading this thread, does anyone of you have any ideas on building an Iron Man Suit? The suit should include: -Ventilation -Propulsion -Energy Source -Information Access -Others you can think of I'm doing a compilation of ideas, and might make one if possible Your ideas can be wacky if they want to be, but preferably following the laws of current scientific theory. :3 Thanks for your help ^^

Would be great to find a member that has professionally studied about these devices and can clear myths found everywhere including the web. Or that is not a myth. Excessive fluid level in an automatic transmission is warned against. (Oil in engines too, but I understand why in them) What parts become damaged ? (if damage is the concern) Is there symptoms of overfilled ? If you share the commonly found opinion that overfilling will foam the fluid; where in the transmission, how, why is foaming supposed to form ? Wouldn't 'foaming' happen if there is too little fluid instead, and the pump is sucking some air from the pan ? -That would be the opposite of overfill…

I have been trying to determine(for a game I am designing) what fuels and engines would a technologically advanced interstellar species most commonly use for space travel assuming they want as much energy output as possible for the smallest volume and mass possible. It seems as far as fuel goes hydrogen is the only combustible fuel that makes sense, other then that they might use antimatter, fission and fusion. Are there any other forms they might want to use and why?

Israeli Missile Defense System Intercepts Overwhelming Number Of Hamas Rockets By Jeff Stone@JeffStone500j.stone@ibtimes.com on July 09 2014 3:21 PM Though Hamas fighters have fired hundreds of rockets into Israel in recent days, the onslaught has had minimal impact with no reported injuries, demonstrating that the tiny country can protect its citizens with one of the most futuristic and effective missile defense systems in the world: the Iron Dome. http://www.ibtimes.com/what-iron-dome-israeli-missile-defense-system-intercepts-overwhelming-number-hamas-rockets-1623606 Looks like hamas rockets are not as deadly as Israel says they are.

Hi. Do bimetallic junctions with no electrolyte at all, and both at same temperature (no thermoelectrics related) produce a minute amount of voltage ? As in explosive bonding, electroplating, sputtering or other processes, where two dissimilar metals are intimately joined.

What are Quantum Dots and how we can use it/imply it in Electrical and Electronic systems