Build Definition and 466 Threads

Basically, I've written some code that take as inputs 1)Basis vectors 2)lattice translation vectors and computes the structure factor of the basis, producing a diffraction pattern. I'd like to begin incorporating subtle differences between atoms, so I want to compute the structure factor of...

How strong of a magnetic field do I need to get a 20kv @ 60ma beam around a 90° turn? / Do I need more information to find out?

(SOLVED) How to build a 3D random vector perpendic. to another vector Hi everybody, do you have an efficient method for build up a vector with random components which is perpendicular to another (unitary) 3D vector ? Context: I have to randomly select polarization vector (P) for...

Would it be possible to just get a swirling plasma in an acrylic tube kind of like the arc reactor in iron man? I'm not talking about anything close to the temperatures or pressures required for fusion just kind of a demo piece to show the general idea.

I know, it sounds a little more epic than it really is. It is true, however. I am in the process of writing a story and would very much like to have the specifics of the other planet described at one point to the reader so they can get a grasp on the world part of the story is taking place in...

Hi. Just a idea wondering around my brain today. I live near volcanoes, some have secondary activity (which is used for geothermal exploration), but while the magma is close enough to the surface to create secondary volcanism activity (such has fumaroles), we don't any geyser. After...

I have to deliver a project for my analog electronics course and I wanted to build a synthesizer (the simplest version possible since I am a total beginner at this). It would basically be a function generator with a knob used to control the frequency (with maybe banana plugs for sound output)...

For the past week or so, me and a buddie have been trying to figure out how to make a mini-hoverboard kind of this, now it doesn't even have to look like a hoverboard we just want it to be able to get off the ground with 2 fans. What we were going to order was all this stuff...

Hi All, Greetings..! I am a master student in nanoelectronics from India. I wish to know how to generate nanostructures (for example as shown in figure attached) using programming (C/Python). Are there any algorithms or literature that discuss how some random structure of...

I need to project a solenoid. But i have some questions: - How much need to be thick enamelled copper? How i can calculate the thickness necessary? (to not burn solenoid wire) - Will be good enamelled alluminium too? This if i suppose to power it with 10A, 2000turns. And: - How i can power...

Hello! :rolleyes: I am given the following exercise: The director of a research institute has in possession $6$ mathematicians and $7$ physicists.A research program requires the participation of $3$ mathematicians and $4$ physicists.How many different research teams can the director...

Im trying to build garden boxes this summer and I am trying to determine the dimensions through optimization. Its been a long time since I've done this and I can't seem to model this mathematically. Id like a box where the volume=13.5ft^3 and the height of the frame to be 8 inches or .66ft. Id...

I know it's old-ish news, but I just heard about it in an engineering class recently while we were talking about ethics. Apparently two guys, one a member of the KKK, decided that they would try to hack some medical equipment into a serviceable X-ray "cannon" that would expose those they deemed...

I got the exam results for one of my most favourite subjects today-Dynamics of Machines,and it was horrible. Luckily I just managed to scrape through. In my university(German one),getting a very good grade is tougher than the University in my home town. I feel devastated because it was a oral...

Hi fellas. Thanks for taking the time to read my post. I basically wanted to know if it is better to learn programming different languages rather than say building things? The reason I ask is because I want to get an internship by next year and I have no experience with programming or...

Hi, I am new to this site, but it seem like there are some very intelligent people posting on this forum and I was hoping someone could help me out. I am trying to build a LED light. I would like to string 10 of these lights together and plug them into the wall. 5 watt 430nm (hyper...

Hi, I'm trying to get my head around Schrödinger's equation and quantum wave theory. I'll try to shortly state how I understand it so you may see where I'm wrong and better answer the question. In classical mechanics if you solve a linear differential equation, the sum of the solutions is also...

Hi all, I am in need to create a system with which can output a AC signal of high voltage and also have good resolution at low voltages. Currently, I am using a function generator with an 100X amplifier connected to a potentiometer. When I want to use low voltage I turn the potentiometer...

Dark matter build up near or inside Black holes, thoughts ? I can see it making a real mess of the motions and energies of normal matter in and around a black hole or other very dense body that confines dark matter to a small adjacent region. Unslowed by frictional forces...think angry...

I want to make a .00 to 1.00 volt dc voltage regulator with a pot that goes full circle like 0 volt way to left and 1 volt way to the right I can either power this from a 1.5 AA battery or 12 volt car battery how is the best way to go about and what components would be needed? What I am trying...

Hi, I'm a student working with my group to create a lab for our final lab project. Me and my teammates are stuck on how we should begin to set up the project. I attached 4 photos, one of the pendulum setup, one of the model of our pendulum setup, and two others of the lab sheet guide. The...

Hello, I am looking on building my own water bike after finding out that they start around $1700 like the one pictured in this thread. What designs / materials can make this better? I would like to also have transparent floats rather then the original colors that you constantly see...

My girlfriend found several little black cylinders that looked like rodent feces in her Fruit Loops the other day, so she sent them a complaint about it. They replied back saying that the cylinders were "a build up of ingredients" and a couple of coupons that nobody who got mouse poop in their...

Hello everyone, I recently posted about making a color organ, in which I was going to use a circuit to process analog signals. Since then, I have decided to move in a new direction of a digital color organ. I would really appreciate if someone with more experience than me could give some...

As a physicist... Would you like to fund your own research? Lets say that you are a brilliant physicist—applies to any scientists in general—and working on a research while running a business, and you have the ability to fund and build laboratories. I want to hear what people think of that...

hello everybody i want to setup up a computer lab for a school as my ngo but i still don't know much about servers and i was hoping i would get some help here

Hello. I have an idea for a geo-thermal cooling system which I want to use to cool the CPU and GPU of my computer. My goal is quiet (fan-less, and dust-less) computing with a very high cool factor (as in Fonzy, not temperature) <grin>. I suppose you'd call this a proof of design concept. So...

Every time I think that I've seen it all, a story like this comes along. Thankfully, someone reported these two to the FBI. FBI Foils Plot To Build X-Ray Weapon

I'm not sure if this has been addressed previously, but there is an engineer who goes by the name of Dan who claims he can build a real starship Enterprise within the next 20 years. All he requires is the necessary funding, which is about $50 billion for each year, which I think is insane...

Is it possible to "build" atoms? Was just thinking to myself, the world running out of resources etc... the most basic form of matter is the 3 subatomic particles... and all matter is made up of them. i did some googling but couldn't find much so I am wondering if one day it would be possible...

1. A van der Graaf generator is used in classroom demonstrations to illustrate the production of large electric fields with visible arcs. The threshold field for air to reach dielectric breakdown is 3*10^6 V/m. In a particular demo, the van der Graaf dome is a hollow sphere of 25 cm...

Hey, I'm new to this forum and registered specifically to ask people who know what they're talking about how I can make a generator for a wind turbine I'm trying to make. I'm in my first semester of college, and only have a high school education when it comes to physics, so obviously I've got...

I'm doing a high school physics project on particle accelerators. I know it's not realistic to build an actual particle accelerator, but I'd love to be able to build some model of something that works to go along with the powerpoint. I saw a video of someone using a ping pong ball with...

Where to hire someone to build circuit? -- Moderated Well, here's the deal. Thanks to help from someone on this forum, I have successfully built the circuit to drive a police lightbar (for filming a movie) that I want using the parts I want and keeping it super cheap. I've come to a new...

build 1 bit comparator using "2 to 4" decoder?? Homework Statement The Attempt at a Solution worked out truth table: A B A>B A<B A=B 0 0 0 0 1 0 1 0 1 0 1 0 1 0 0 1 1 0 0 1 prty sure that's right. just need part B...

Please recommend a high quality power supply (at least 1KW) for this new gaming build. I haven't finished it yet, but it should be complete within the next few months.. *Core i7 3770K *Corsair Dominator Platinum 8GB DDR3 1600MHz cl9 RAM *MSI Big Bang Mpower Z77 motherboard *Two-way SLI GTX 680...

Hi everyone! This is Mohammad Umar. I am a mechanical engineering student here in Delhi, India. There are many things that are running in my mind right now regarding my career. Its already high time now! I am planning to go to Germany for my M.S in automobile as I am really really...

Can I ask you about some opinions? We desired to build a bicycle. That is we convert our mechanical energy to electricity energy and stored in capacitor by dynamo. Then when it reaches certain value we discharge it and connected to the portable air compressor. The electricty drive the...

I understand that it wouldn't work. But I'm curious with the development of nano technology, has anybody ever constructed a real life brownian ratchet to visually verify Richard Feynman's analysis? On a scale of 1 to 10, actually being able to see the failure would be pretty cool...

NASA could build a warp drive?!? I just read in a article that NASA has revisited an older theory and found they can improve on it greatly. here is a link to the journal (i guess that is what it is called) of the scientist who is working in this...

Hi so I am trying to build a rotating platform for a system consisting of two 12in. subs approximately 60 pounds, I would like it to rotate 180 degrees and then back with the flip of a switch if possible. I have absolutely no experience in this what-so-ever and all of the auto places want to...

Hello this is my first post so if i do anything wrong pleas tell me so thanks. So i am trying to make an air cannon to shoot basketballs half way across a basketball court not into the hoop but just bellow it. Can you tell me if my calculations are correct?. The half the court is 42 feet(12.8...

Nice toy... :!) A recent offshore wind turbine. 6MW peak power, the rotor has 120m or 154m diameter :-p The alternator rotates at the blades' speed, without a gearbox... With D=6.5m, it uses permanent magnets, its stator must be actively cooled, and the nacelle weighs 200t. Still not my...

Hi! I aim to use a piezoelectric wafer and get it to work as a loudspeaker by supplying it with a fluctuating voltage withing the audible region. I know this can be done using a simple DC to AC invertor/oscillator circuit, but the challenge is to build it as small as possible. I looked up...

I had "posited" or proposed this idea to a professor of mine about building a device which could capture all forms of electromagnetic radiation with varying sized charged particles and a solution that was conductive. Another option is a type of electromagnetic fabric which is basically...

[SOLVED] how to build a device to measure in angstroms Hello, I was looking at a micrometer and wondered how one could build a similar device for meauring in angstroms. Could someone point to some theory that discusses the same ( for example if i have to forge a screw what would be its...

Hello everyone, For my physics class, I want to build an AC motor with styrofoam, magnets, screws and magnet wire. So far, I have built a cylinder of about 2.5" of radius and 1" in height with eight magnets (strengh 6/10) around it. Each magnet is glued on the side of the cylinder...

I am wanting to build a custom PS3/TV combo inside of a pelican 1500 or pelican iM2600 case with a 20 inch TV inside the lid for a deployment to Afghanistan. Has anyone done this (besides Ben Heck) who didn't use heavy machinery to cut out frames and all of that? I don't know if best options...

So last year I took a course in quantum computing, but I didn't understand how can you build quantum computer? I mean do you have literature on the technical issues of physically engineering such an apparatus? The course I took was really theoretical, but I don't understand yet of how to...

Hi Everyone, I need to build a battery for a shoebox-sized vehicle. I'm still collecting requirements, but I'm wondering if you have any suggestions beyond a potato battery ;^) Farina