Engineering

In the near future, I will be using a computer program (either Autocad or another good architectural software, likely the former) to design a very basic layout for a skyscraper for a project. In order to do this, I need to decide level of detail I would need. I am currently a high school student doing this for a science project, and I will be honest and say I do not have much experience designing buildings other than an introductory architecture course. Can I get away with a blueprint with dimensions or should I aim to design a full 3D model? Secondly, I need to decide dimensions. I am aiming for this to be a sustainable office building skyscraper that incorporates …

Hi all. Two identical boats laden with the same weight, outboard engines; if one engine head is replaced with an electric motor, and both equal propellers at the same gear/rpm, how they compare their thrust forces in Kilowatts against horsepower developed; in several conditions as tied to a pier, at 10 km/h, 20 km/h, full throttle... ? How to reasonably accurately do a equivalent calculation/comparison ; as to say a 'x' number of electric kilowatts match 'y' number of horsepower ? The horsepower ratings are typically af full throttle/ideal conditions on marketing papers, but; is there a way to state something like 3 gasoline horsepower =~ 1 electric horsepower ?

Hi Guys im new to the forums but for the past year i had a great idea that i want to make happen. My first question is i can not work out thrust say for example i have a box 10x10x10x10cm pushing out air then sucking air in. So how would i work out how much thrust this would generate just buy pushing the air out once then how many RPM would it need to do to make a 100g item leviate. I hope i havent confused to many people .

I want to make measurements of refelectometry in situ, and 19 cm is the distance between the substrate and the window.

Hello everyone, I am doing research in an attempt to build something that I had thought of. And one of the things that is troubling me is the pressures the system is going to have to endure. The operating pressures are around 10,000 psi but if it is shut down pressures will accumulate to slightly over 20,000 psi and it should be able to do this safetly. The only problem is I can't find any information on air tanks that have operating pressures of over 6,000 psi. I've concluded that I will most likely have to build the "containers" myself. But I still often ask myself is 20,000 psi too much to handle? I want this thing to be able to last a long time, but with moving m…

Well known as unstable, and shown in this hilarious www.youtube.com/watch?v=QQh56geU0X8 ; how would this [1+2] compare to a three wheeler having two wheels on front instead ? Would rolling not happen, is it better, different, what stability problems should surface in the second [2+1] case like this one ? ----> http://graphics8.nytimes.com/images/2013/08/09/automobiles/wheels/elio-1-top/elio-1-top-blog480.jpg

I recently acquired a sealed lead-acid battery, 6V, 4.5 Ah, 20 h for use in electromagnet experiments. I assumed that this would output 4 amps, given the ratings previously mentioned. However, it only outputs about 0.06 or so. How can I get this up to 4 amps or more? I would like to use this, an F630 MOSFET and about 710 ft. of 32 AWG magnet wire for Arduino-controlled magnetic levitation, but it's a moot point if the current is so low. Is there a way to force it to get higher, even if it does shorten battery life?

I would like to understand the changes on adding increasing concentrations of a calcium solution to an alginate solution and why there is a difference when you add the alginate solution to the calcium solution instead of the other way round. Many Thanks!

Hi everyone ! I'm looking for some evidence from people who works in the micromechanics. In order to know about what products are you working on ? good opportunities ?

I have an idea to clean space of its debris, but I don't know if its a good one : I would use some kind of spray bombs as mini satellites, containing self hardening foam that would inflate themselves to become big, low density balls of plastic foam. We could put in orbit a cloud of those mini satellite that would then be able to slow and capture little debris. It would have to be a very sticky and slimy material, in order to always stay in one piece after violent impacts with debris (but we would need to avoid contact with other functionning satellites). We also need to insure that the ball of foam doesn't stay long in orbit, and fall on earth with its debri…

Hello Everybody, I have somewhat of a weird question to ask. I am really interested in learning about Magnetism. Now, I know what you all might say, just Google it, buy a book, watch a youtube video, etc.. But really, I am trying to find out if there is an actual course that I could take that would specifically focus on Magnetism. I know that all of this is related to Physics, but I just wanted to see if there are any courses out there that would specifically focus on magnetism that I could take either Online or on a Campus type of a setting. I currently reside in Denver, CO. There is so much information out there that I am somewhat lost and have no ide…

The last thread on light sources was in politics So here's a start for a technical thread.

Hi dear friends! Ionizing radiations emitted at Solar flares are said to be a concern for astronauts, say on a trip to Mars. If the rays are parallel enough, and their direction varies slowly enough, here's a possibility to make a shield lighter and more efficient: The (here purple) shield stops most primary rays from the Solar flare, and inevitably creates secondary rays by bremsstrahlung, whose gammas and X-rays are difficult to stop. The trick is to put this shield farther from the craft, at some habitat sizes away (I'd link it mechanically) but keep it just slightly bigger than the habitat. Then, most secondary rays don't hit the habitat. An other…

Hello everyone, I am wondering about Humidity Card. It is used for many purpose different Industries. Simply, it is a card that absorbes the humidty and changes colour. Slica gel is used for as an absorbing material. But the challange is how do they provide the relativity. I saw the original product. It has levels from 20 to 60 and when it absorbs the humidity first 20 than 40 and finally 60 turns from blue to pink. How can this be done? I attached a picture in order to be understand better. You can see levels. If anyone has an idea please let me know. Thanks.

So, this thread is going to be dedicated to the trial and error of me making an Arducopter(autonomous robot helicopter) Now first things first, how would one suggest me make a electric motor with enough power to lift itself into the air, plus say, another 2kg . Also, is there a formula to find out how much the motor could lift? I really don't know how an electric motor works, because I usually muck around with gas powered engines(and for my RC's, nitro glow plug engines), so this is entirely new to me I am thinking of making some of the prototypes out of balsa wood, because I can make everything with it. If anyone has any other suggestions, they would be welcom…

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.