Engineering

Hello) I work with steel 12X18H10T after cryogenic treatment and subsequent anneal uniaxial tension. Have you encountered similar steels and what research method apply?

Critical resolved shear stress is an important factor to the deformation of materials. The numerical value of crss determines the deform mechanism and the ductility of materials. Is there some generalized theory which can explain the influence? Thank you.

Hello, i have some mild steel test sample and they are tested with tensile stress. I have obtained the Young's modulus is in the range of 290 to 320 GPa,poisson ratio is 0.27-0.29. However, those stress and strain curve of tho mild steel do not have upper and lower yield strength. So what may be the reason of this problem?thanks

This is a picture showing how silicium atoms share electrons together in the form of a silicium crystal.

This is a shot in the dark because I've had no luck so far, but is there any material out there that will reflect or block and Electro-Magnetic Pulse? I'm not talking about a Faraday cage cause that just attracts and absorbs it. I need something that will block the pulse from going behind the break wire. If anyone can help me, that would be incredible. Thank you for your time.

i know i'm probably totally wrong with this, but i need someone who knows what he's talking about to tell me exactly where, and why, here's a quick sketch of the idea i drew and scanned/edited a little...it sorta explains itself, electrolysis(or however its spelled) turns water into hydrogen and oxygen, which then goes up a tube with a one way gate(like the ones used on a beach ball to keep the air in while you inflate it, or a water gun to shoot the water up front and not back into the tank) and goes trough a turbine, propelling it,(thus already generating, somewhat energy, ) then up to a electricity produced spark, combusting, exploding, and turning back into water, it …

I am totally stuck on this question. It is about a diffuser and it does not tell you what fluid is running through the system. "A diffuser has the following inlet conditions: p1=100kPa T1=300K Velocity=200m/s Area=100m2 Specific Volume=1.6445m3/kg The exit velocity is 20m/s Calculate the exit pressure, temperature and the mass flow rate. (Assume adiabatic operation)." Would it be correct to use the Bernoulli equation, taking into account enthalpy and kinetic energy changes, to calculate the exit pressure? This is assuming density is constant. I am not aware of any equation which will allow me to work out the exit temperature without knowing wh…

I am way out of my league and need some help. I have a thermoelectric project but do not have a clue how to determine the "horsepower" needed to accomplish the task with some reserve in case I forgot something. Goal...keep a can of liquid cold (between 33 and 39 degrees F). It will start cold and must stay cold...24/7 The can is 3 inches in diameter and 14 inches long. It will be stored in a heavy aluminum pipe (maybe 1/4 inch walls) covered on one end (the bottom of the pipe) and open on the other end. I expect to mount a plat on the side of the pipe to add some mass along the length of the pipe. The Peltier will be mounted to the plate. The pipe will h…

Hello, I am a business student currently collaborating on a technology project whose aim is to find alternative applications for a radiation detector made from artificial diamond. The main benefits of the detector are: • Ultra-fast response time • High durability in really harsh environments (vacuum, radioactive environment, space, cryogenic temperatures) • Very good signal-to-noise ratio and therefore very precise and reliable measurement • Broad dynamic range (radioactive particles to UV-light) Any ideas where it could be used? Thanks for your help

I can understand them being able to actually arrange the pre-grown cells onto a scaffold for growing organ, but will the printers ever actually be able to print the cells themselves? What would be the difficulties trying to do this, seems like it would be like trying to print a water balloon for the most part, hard to do, hard to keep it together as you are doing it.

Hi guys, I’ve been conducting some research on hydraulic ram pumps and devised a hypothetical design for what I would like to call a ‘small gain machine’ as it could potentially achieve a small gain of potential energy, although I’m unsure with regards to the total amount of electricity to pump the water from the bottom of my proposed machine. Please note I’m not trying to design a ‘perpetual motion machine’ as ram pumps are not immune to frictional forces and require some input energy in the form of a reset to ensure they are at their optimum pumping efficiency. Basically my proposed machine (see diagram) works with water running through a central turbine which generat…

Hi. The earth magnetic field extends quite a bit in altitude, but do not know if is reasonably/equally strong at the altitude the satellites orbit. Can you confirm that? Being the earth as a giant magnet, I believe that if onboard a satellite, a magnetic field is generated with energy from its solar panels; a repulsion or attraction effect relative to the earth could be managed by orientation of such. Orbiting satellites lose altitude with time, some deplete their supply of propellant to stay put. Could repulsion management in a satellite sustain/gain orbital altitude to avoid falling eventually ? If the main reason of satellite falling is loss of its speed, c…

I share with you this idea that came to my mind wandering on the world map years ago, and that I havn`t been able to challenge in the correct way as the people I interact with during my daily routine aren`t the most recommended to help me out. Have anyone ever considered using the natural temperature gap that occurs in some part of the planet during the day-night transition? what came to my mind at first was a system of "containers filled with a liquid that weight more during the temperature transition" connected through a pulley to a counterweight and an electricity generator connected to the pulley: when the temperature changes the container with the liquid will…

I want to be able to find out the force I can generate with strikes and blows but I don't know and can't find any companies that supply pressure mats.

I have a european 650w(220/240v) hand blender and I tried to look for an american hand blender with the same wattage however I haven't found one that reaches those wattages. I did some math. 650w / 220v = 2,954545454545455 amps(?) 2,954545454545455 amps x 110v = 325 watts(?) Should I be looking for a 325w-110v hand blender if I want the same power as my 650w hand blender? I know I can get a step up voltage transformer/converter but they are fairly bulky and ugly.

Interesting, had to share : ---->http://www.motorauthority.com/news/1079555_stinger-609-worlds-smallest-four-stroke-v-8-enters-production -Enjoy-

What is Carbon Bicables?

Hi everyone !! i am shortly going to graduate with my bachelors in mechanical engineering.However i always wanted to study something closer to the bio feild. Now that i want to pursue my master's i am confused between masters in bio medical engineering and masters in mechanical engineering. I wanted to know whether taking up masters in bio medical after coming from a mechanical background is advisable or not ? and how are the job oppurtunities in the bio medical field ?

Hello, radiocomm tinkerers and everyone! The Uda-Yagi antenna is the rake you see on roofs to receive television programmes: http://en.wikipedia.org/wiki/Yagi-Uda_antenna High-gain versions have over 20 elements, but sometimes the driven element plus a single reflector or director suffice: I see a reflector almost everytime two elements are used. Though, I believe a director instead has only advantages: The radiation resistance drops less; The gain is marginally better; The backward attenuation improves slightly; The passband is wider; The elements' width and spacing are less critical; The antenna is shorter. I've built antennas of both types, but not for the same u…

is it posible to create such things? i saw on a show

Hi. There is several options I do not see clear, specially about fumes indoors. Kerosene, propane, natural gas; in vented, not vented types, standalone, wall mount, and others. That yields a large number of combinations to choose and with no experience nor knowledge on any, can be scary. The non-vented types, I supposed been tested and considered safe, but still something tells me to be extra careful. Any suggestions ? For use in living room (hoping to warm all the house, not to be used inside any bedroom, and to heat a small ~1100 sq.ft. dwelling. Would smoke detectors be alert too ? The air used by them (oxygen) has to be supplied from somewhere; how does …

Im doing an experiment that involves heating a 9" diam 7/8" thick stainless steel plate sitting on top of a 12"x12" hot plate. The hot plate is set to 776 F (~413 C) which is as high as I'd like to set it. There is a thermocouple in the side of the steel plate 5/8" up from the hot plate. The experiment requires the plate surface reach 435 C. *I am aware that the thermocouple reading in the plate is not the actual reading of the surface temperature*. The practice around the lab is that by putting an aluminum foil "lid" for lack of a better word over the stainless steel plate will allow the steel plate to reach 435 C +. Besides the conduction between the hot plate and the s…

Hello you all! Common industrial methods to produce (water) ice are: For ice blocks, put water in flat containers, chill from the outside by a liquid circulated between many containers. For ice chunks, chill metal tubes by a liquid circulating inside, pour water outside, break the obtained ice regularly. For ice chips, put water droplets in a cold gas. Droplets won't make thick ice, and the first two methods limit the thickness or take too long, because of water's freezing heat (335kJ/kg or 308MJ/m3) and ice's heat conductivity (1.7W/m/K). If you allow an efficient cold plate to be at -10°C, the slowness of growth is 18,000,000s/m at 1m thickness, and: 1mm takes 9.1…

My question is are any other means to produce a self sustainig power source that is enviroment friendly like SEG (Searle Effect Generator) http://www.searlsolution.com/technology.html I know that SEG is simply a converter of ambient electrons to usable electrons. I basically want to use Proffessor Searle concept but not his design, dont want to copy him.

Hi. Trying to build a box/vessel made of silicon carbide, about 12 cubic inches capacity (~125ml). Will be exposed to 300 degrees C. Can be a cube, Can be a cylinder, Can be a pyramid, Can be cup shaped but crucibles are too expensive to play with, Can be made of thin ~3mm 'boards' of grinding disc material like this : ---->https://www.forneyind.com/store/detail/695/masonry_concrete_asphalt_cutting_type_1/6620/cutting_wheel_masonryasphalt_type_1_14_x_532_x_20mm_arbor_c24r-bf/ But cutting its material off to form/make the sides of the box has to be mission impossible. Can be made of carbide sanding paper/cloth, but the backing would burn unless there is o…