Device Definition and 509 Threads

I am a little confused about exercise 1.2 in the book "Quantum Computation And Quantum Information" By Michael Nielson. The question is: Explain how a device which, upon input of one of two non-orthogonal quantum states |a> or |b> correctly identified the state, could be used to build a device...

I want to have a powerful magnetic levitation device as an attraction for college fest and also as my first big project! So I need to know how to start with it. I need to workout with all theory parts before I start building it ! Where to start from?

Hi my names Oliver and I'm new to this but I am currently studying engineering, maths and physics A levels and as part of my engineering I have to create an innovative product. My idea is a saucepan with a built in device to stir the contents without the need for human interaction. So far I've...

creating force with sound Hi, I am currently building a device for the company I work for to open molds that have been plasticized together using sound. The idea is to produce a frequency that will either vibrate the lid open or push it open, but I am stumped on what calculations I need to use...

Hi I am looking for a good e-ink device with the following features: a. PDF support with annotations. The screen should be capable of displaying one full page with readable font. b. easy navigation to different parts of long article. Navigating by page number would be helpful. c...

I want to implement circuit that can be operate throw web browser there are many network controller but I want to use ARM controller I need advice I mean where we can use this type of circuit ,tell me commercial use of network enabled device

I have a pretty specific problem that I'm trying to solve and I'm out of ideas. I can't divulge too many details, so I thought I'd use an example to describe my problem in general terms. I'm not sure if it's really possible to brainstorm using this forum, but I thought I'd give it a shot...

Dear physicist, I am designing a device that will use firetruck/hydrant water pressure (~150 psi) and fire hose (5" diameter) to lift up a device in the air and into a burning room. Please advice me and help understand how water flow, pressure and areas influence thrust. My goal is to input...

I have a project which is to create a mechanical device that would transfer close to 1 J of energy from one form to another and must be able to show how you calculated the 2 energy individualy and show that the energy loss between the 2 is within a % difference. I posted on here yesterday...

Wow! A physics forum! Here's the device I filed a U.S. patent for, so I'm wondering what to do next? http://www.youtube.com/watch?v=wYgfRzxc-Hs I've talked to the chair of my physics department and he said the amount of light arriving at each pixel is very small. CCDs are becoming...

In the following http://electrons.wikidot.com/solar-cells it mentioned that how and when n-side becomes positive?

So I'm a diabetic and i know about the prickles meters, i want to know how they work though. I would assume it has to do with some form of EM wave possibly reflecting off just the glucose molecules in the bloodstream. Thanks for anything you've got!

Any reason why the balloon could not be substituted for a turbine to make a practicle flying device . One that could have comercial use. http://www.presentsformen.co.uk/science-museum-balloon-copter-prod9413/?gclid=cpdtrkvg074cfcpmtaodrnoa5g

So we are playing a Serenity game, and after the adventure our DM rewards us with a highly rare and expensive water generator! He explains that it works by taking oxygen and hydrogen from the air and combing them to form water. And now we will have this in our ship. I stepped away from the...

Hi Physics Forums, I'm a biochemist whose electronics experience is limited to resonant RLC circuits. I have been tasked with building a device that essentially acts as an RF antenna. In transmit mode, this device must create a sine wave of specific frequency (current plan is 40.05 MHz)...

i was looking at an e-cig and wondering how it regulates watts. would it be viable to make your own? for those of you who don't know they run off of a 18650 3.7v battery that powers a coil. the coil is in the ballpark of .3 - 3.5 ohms. how do i get 30 watts of regulated power and jam it...

Just got this at an auction and I'd like to know what it is. it's very heavy, and geared to heck and back. nine inches tall. seems serious enough to guide something big. it is machined and engineered beautifully, and everything is still working. clearly high-grade, possibly government contract...

http://upload.wikimedia.org/wikipedia/commons/2/23/Nuclear_Fission_Experimental_Apparatus_1938_-_Deutsches_Museum_-_Munich.jpg Hello everyone. According to Wikipedia, this is a photograph of the experimental apparatus with which Otto Hahn and Fritz Strassmann discovered nuclear fission in...

What is it controlling and What devices are in the loop

Hello everyone. I'm sure there is a really good reason as to why this hasn't been done yet but I just wanted to ask and see if it could be done. Why can't we make a mouth piece that basically takes in water, filters out the oxygen and then expels the water back into the ocean, then takes in...

Hi all, For an applied electronics class I'm currently taking, we have to come up with and build an electronics project of our choosing from scratch. I think it would be cool to build some sort of radar device. I have been looking into phased array radars, radar speed detectors, etc., but a lot...

How can I give interface traps while simulating a power MOSFET in Silvaco ATLAS tool?

First of all, if this post is inappropriate in any way or located in the wrong sub-forum please just let me know and I will correct it (or delete it). I am a long time reader of this forum but I have never posted before this. I really appreciate all of the people that contribute to this forum...

What is a good way to memorize that ## \omega = \sqrt{\dfrac{k}{m}} ## ? I always confuse it with: ## T = 2\pi \sqrt{\dfrac{m}{k}}## , and can never tell them apart. (i guess part of it is that I'm not too familiar with it yet)

Dear Forum Members, Related to this forums area of expertise, I have a question I would like to ask. Any input would be greatly appreciated! First, some background: My church's bells are rung by three separate Rabbit 2000 Embedded Processors. The combined wattage output of the processors...

Hi people, I was wondering if anyone knows of any commercial device to measure directly Planck's constant. I mean no use of indirect measurements, just to press a button and for the number to appear in a screen. Thanks

I'm confident that most of us have seen the advancements in quantum levitation recently, and this has aroused questions among the geek community ( us : ) ) Anyway, if I were to, hypothetically, want to build one... How do I- *cough*- one do such a thing. What equipment and supplies are in play...

Hello forum, I am having a little trouble interpreting the data I got for a recent project in my fabrication lab. I created transistors of varying gate widths and lengths and am characterizing them by performing various electrical measurements. Initially, after completing my device, the IV...

Hi all, I am looking to do some magnetic measurements for some research (chemistry...) but I'm hoping to get an understanding of how a SQUID instrument works. I was wonder if anyone could give me a qualitative overview or if anyone know any resources without math-heavy explanations. Thanks!

There are several possible topologies for an electrical circuit. However, if we limit our circuit to be a two terminal device, how will this limit the options for the different topologies? I am a beginner in this field, but as far as I can tell by drawing the circuits, the only possible...

Homework Statement The Attempt at a Solution Let's divide it in three states. E_1(\text{Initial state}) \\P = 3.5 \text{MPa} \\T = T_\text{sat@P} + 5 = 242.56 + 5 = 247.56\text{ C} \\ h_v = \text{Known value (table)}\\ v_v = \text{Known value (table)} E_2(\text{When the piston hit the...

Accelerometer -- device on a parabolic track EDIT: Picture of problem in its entirety farther down. A device on a parabolic trac moves on the track described as y=x^2. Both in meters A$ find an expression for acceleration using position. B) what is a if x=20cm? My solution. First, I took...

Hi, I was just writing another thread when I stumbled upon something strange: What if I now make a slight change and replace ##\bf{b}\rightarrow-\bf{b}##? The expectation values containing ##\bf{b}## change signs and I get $$\left|\frac{1}{\sqrt{2}}-0\right|=\frac{1}{\sqrt{2}}\leq...

Hi I am using win xp on my laptop. I recently purchased D-Link DWM-156 dongle (google for images). In this I insert indian SIM card and hook this into the USB port of my laptop anb then connect to the net. Now these dongles work best when the signal strength is strong. When I take my laptop...

Greetings everyone I am deciding on a project to work on for my bachelor's degree in engineering right now. I have an idea that involves using multiple metal detectors placed about 1-2 cm apart from each other. The idea is to develop a device that is able to detect the shape of an metal item...

I've several power adapters of cellphones/routers/modems etc lying around at home. I want to find out if they're any good, however I don't have the right devices (cellphones/modem/router) to check them with. I only have a voltage tester...

im looking for a circuit with this ability. so you have a signal input going into this circuit. and this circuit has an external power supply. this circuit outputs its signal where the input comes in. the thing is, i want the output signal to be 0° out of phase with the input and higher...

I think I sort of know the answer but I'm still wondering how I can achieve what I want to achieve. I basically want to use the stored 'work' in the compressed air can to pressurize a different container and while doing so, taking in particulates from the ambient air to be contained into the...

Homework Statement 0.03m^3 of air is contained in the spring-loaded piston-cylinder device. The spring constant is 875N/m and the piston diameter is 25cm. When no force is exerted by the spring on the piston the state of the air is 2250kPa and 240C. This device is now cooled until the volume is...

I don't need basics, I know the causes how xenon flash "works" ; I need to know how do they minimise this kind of circuit in microprocessor? My question: The Flash tubes require kVs of potential difference to work. I am aware that big capacitors are required to make them work. This is okay...

I am in process of doing a project for school. The basic aim of the project is to address the following issue. I live in a country where we have a lot of street vendors and beggars that stand in the street at night and as a result are not visible to oncoming traffic. i would like to create a...

Recently I entered a competition to join a club. The task is to make a "thing" that climbs a rope. The rope is about 1/2 a centimeter thick and it is graded on design, speed, and overall in general. I was wondering what might be a good design for this project and what materials I should use? It...

I just acquired this magic jack looking device called Rabbit TV https://www.rabbittv.com/ Its a USB device that you plug into your laptop that's supposed to get you thousands of free TV channels. I read some online reviews that didn't look so hot. So I don't want to plug it in until I do...

Hi folks, I'm looking for a device with a screen smaller than a laptop, bigger than a phone, which can do the following very well! 1. allow me to enter math by stylus and have it convert to latex for export via various file extensions; 2. link with my linux OS on my main computer (so, perhaps...

: If someone was burning your head with a energy directed device? Say they were very rich and performing a mean prank and burning your head causing itching and hair fall out what types of devices could be used assuming they had millions to spend.

This is an instant idea that I got right after i read an article about noise. Do you think it is possible to make an noise cancelling headphones by using the LM741. Except, i won't be amplifying the signal from the inputs (i can if choose to by just adjusting the varistor) but by using this op...

Hi, Is solid state device physics a must learn subject to design analog circuits. -Devanand T

Hi everyone, in the last times, I'm really interested in controls engineering, and I wanted toknow how to find transfer functions of devices, or systems in the real world, let me explain better, for example, in my house i have various dc motors, and stepper motors, since i want to make an...

Hi, Is there a device that can attract alpha or beta particles and focus them on a point. Something like the reverse of a CRT tube for electrons. BR, Adam

Homework Statement You are working with a device in a black box which has two terminals, which are in turn, part of a larger circuit. You measure the voltage and the current at the terminals and record the following: vi (V) | i1 (A) 100 | 0 120 | 4 140 | 8 160 | 12 180 | 16 a...