Engineering

I'm trying to solve the following equation: using the following properties available in RefProp (specifically the derivatives of pure substance): Could anyone tell me how to modify the equation from being partial derivative with respect specific volume to partial derivative with respect to density (which can be easily obtained from RefProp). Thank you

Hello you all! A decade ago I suggested to mix a nano-powder of high index ceramic in plastic to produce thinner spectacle lens. If the powder is fine enough, the composite acts as a uniform material and doesn't diffuse light. Now I read that at light-emitting diodes (LED), laser diodes, photodetectors, photovoltaic cells... the high index of the semiconductor is said to create parasitic reflections at the chip's surface. I'm not quite convinced this is still the case: maybe books and Internet pages describe the situation several decades ago. Anyway, a solution would be to encapsulate the chip in a transparent plastic loaded with nano-powder of high-index cera…

Hi all, can any one explain what are the benefits of pharmaceutical packaging? How it is differ from general packaging methods?

I am in the research process of planning a single person private mission to mars and space. Money is an issue but Can be sacrificed to the mercy of working methods and science. I have little experience in the field and that is wear your ideas and thoughts come in. I am looking for a propulsion system that is the most Physically effective and compare the costs and output to other methods. The most important factor is actual amount of force that the system displays. The second most important is the amount of force comparable to the system or fuels own weight in earth. The third most important factor is the amount of force after weight of the system is subtracted a…

Hi fellows. What are the parameters of consideration to evaluate the suitability of a fluid used as a closed circuit circulating and pumped cooling media ? Thermal conductivity, specific heat, thermal transfer index, heat capacity, viscosity... what else? The circuit to be a machine that gets hot and a heat exchanger to cool the circulating fluid. To replace a coolant such as transformer oil with plain water, or diesel, or transmission fluid, or other suitable ones. Or reverse, as replacing plain water coolant with kerosene, or very thin oils with viscosity near water.

Gagged.

Hi, I've always been interested in humanoid robotics ever since seeing Ghost in the Shell wayyy back in the 90's and have decided to build a simple anthropomorphic robot arm that simulates the movement and speed of a human arm. Im also planning to make the arm react to its environment, but only once the arm itself is constructed and control software is written. This of course will just be a hobby, mainly to break into robotics and see where it takes me. If successful, I would like to construct a full size but limited humanoid robot. I've no plans to make this future bot capable of any type of self-supported locomotion like walking or running. At the most it would…

Hi, guys what you thing about new Innovations in Aerospace engineering. Like - Laser Propulsion Or Beamed Energy Propulsion Laser Propulsion Or Beamed Energy Propulsion Beam Energy Propulsion is a promising technology for near future aerospace propulsion. It offers high payload ratio and propulsion efficiency. But major problem with this Technology is Temperature Increase and thermal Damage (Melting). How can we solve these problems, any body have more knowledge about this technology please share. If you have any innovative idea like this any information regarding new technology in Aerospace Engineering plz share your ideas. Thanx..

except nuclear weapons.. also not >5mW lasers .. i'm writing an essay about present and future non lethal weapons..

To me, the main problems with hydrogen powered cars are where to get the hydrogen and how to store it on the car. Solar power would work for getting the energy, but how do we store it in reasonable amounts? I was thinking the fuel tank could contain a block of lithium, and water could be stored elsewhere. The lithium and water could be used to make hydrogen, which could in turn be combusted the usual way. Lithium hydroxide would be produced as a useful byproduct, it could be sold to the battery industry, or back to the "lithium station" for a discount on your next purchase. The lithium station could take the hydroxide to an electrolysis plant, where the lithium would be r…

Hey, Lately I've been wondering if it would be profitable for a person to start making biofuel in their back yard, throw it into an electricity generator, and then pour that back toward the electric power companies. Would this be a profitable venture?

Hello everyone, I had gone on the chat and I was referred and encouraged to put my question on this engineering section. I am having a very hard time finding sources to locate an electromagnetic engineer with very specific experience. I would appreciate it if anyone could guide me as to where I may find forums, societies, boards, school bulletins or school boards on this subject. Where do electromagnetic engineers hang and chat? I am looking for someone that is just finishing with their Ph.D or Masters in Electrical/Electromagnetic Engineering. Preferably Ph.D. I am not seeking EE's concerning RF, antennas or microwaves. I am looking for someone that has the…

We Use Air to power cars. There will be air vents on the side of the car that pulls air in while your driving. The air will go into a small air turbine which will generate electricity.

I am trying to wire a circuit for a prop I'm making, but I have run into a conundrum. Here is our setup: Battery --------> Switch----Button-------------sound-playing device | ----Button-------------sound-playing device \------------------------------------------------------------^ How would I get rid of the two buttons in exchange for one button that can tell which sound-playing device (and thus which sound) to make depending on the position of the switch? The only temporary buttons I've seen are those that have 2 contacts.

Hello everyone, I am needed to apply a filter to some acceleration data. That I think I can handle (I have chosen a Butterworth). What I do not understand are the CFC (Channel Filter Class) specifications. In particular, I do not know what a "Stop Damping" number specified in -dB is. Below is an example of a CFC60. Filter type CFC 60 Filter parameters 3 dB limit frequency: 100 Hz Stop damping: –30 dB Sampling frequency: At least 600 Hz My sensor samples at 400 Hz which puts my CFC at about 36. Please correct me if I am wrong. At CFC 36, what would my parameters be? Do they define cut-off frequencies? Thank you for any help. Google-skill"z" are failing me. Davi…

Any Engineers here? Of all fields of course. I'm just wondering, b/c I'm going to be a future Engineer too, & was wondering what you guys are doing right now, what you think of your career, is it fulfilling, etc.

Hello semiconductor technologists! I'm thinking at a source of extreme UV for semiconductor lithography, so what would be your wishes, as compared to the first figures that emerge from my rantings? I take 30nm wavelength. Would less be better? I fear fluorescence hampers lithography. Right now I estimate half a watt of light is produced, continuous and monochromatic and coherent, initially in a narrow beam of small divergence. Could that be enough? This absolute silver bullet would cost several millions. Is that any worry? Thanks! Marc Schaefer, aka Enthalpy

As a teenager, I was digging around in my parent's garage and I came across a rather curious photograph. I was looking at it trying to figure out what it was when my father walked in, saw what I was doing, and explained.... Once upon a time he'd been an engineer on the team that designed/built the very first FLIR. When the team was ready, they'd driven the FLIR to the top of a local mountain, turned it on, and viewed the surrounding valley. At night, of course. It was the first time a FLIR had ever been used. They took a picture of the display. That picture was what I held in my hands. Cool. Two weeks ago, my father passed away. Yesterday, while going…

why direction of rotating emf and direction of rotation of field(with the help of a motor) is to be maintained same while conducting slip test on a synchronous machine? The reason we rotate the field with the help of a motor is to maintain some relative speed between rotating flux and field winding.If we rotate in opposite direction then also we can have relative speed(and may get fluctuations in voltmeter and ammeter). But we rotate the field in the direction of rotation of flux only.WHY?

I want to know the list of aerofoils, which is used in small wind turbine blade design

I'm trying to make a simple stencil that can be placed on a plastic, plexiglass, or PVC-type surface, but the stencil I have is too small and detailed to be "cut out" the normal way. Any ideas?

Can we use Electromagnetic Pulse as a weapon????Is it also harmful for Electronics devices???

Hi, given that it should be relatively simple to design a computer keyboard that generated electricity via keypresses, maybe through some kind of induction coil arrangement of some kind for example, if you had a nearly unlimited (but not infinite) supply of monkeys, how many monkeys would you need and how many keypresses and with what frequency might be reasonable (say in words per minute, or key strokes per minute) to power an average 40 Watt light bulb for 20 minutes? I know it sounds like a dumb question, but it's for a young people's training event and we would like to show them that science can be fun and interesting, as well as useful and serious. As a biologist…

Whom would you call if you wanted to know the history, the development and the state of the art of transcutaneous blood glucose sensing? I'm searching for prior art that calls into question the validity of certain patent claims relevant to transcutaneous blood glucose sensing. I'm looking for information that pre-dates 2005. Did you work on early blood glucose monitoring devices? Feel free to contact me with any questions or suggestions, I'd be happy to give you more details and speak with you offline.

what if you supercooled the air intake ports? that would allow increased density of 02 in the engine so wouldn't that increase efficiency?