Device Definition and 531 Threads

Hello for an input signal with a noise we have and for obtain Power spectural density we use autocorrelation function where hkm is but I need to know what is autocorrelation function for different inputs with different frequencies? such as Any help will appericate

A recent short-lived member got me thinking about the issue of telescope vs binoculars for a first stargazing device again after a few years of the issue sitting dormant. I hadn't participated in the particular necroresurrected thread, so it didn't have my take on the issue. Here it is: It...

What is this electromagnetic device called? I've seen a couple. There is this one: as well as one similar but you must keep the magnet in motion to generate electricity. I would like to make one of these, but I don't know the name of it which makes it hard to search for instructions and a...

Homework Statement You have a device that can measure sound waves only if the frequency of the wave is in the range ##0.8 kHz- 20 kHz##. You have a whistle that produces sound waves at ##21.5kHz##. You ride a bike moving away from a wall, at the same time you blow the whistle and hold the...

I have a question that seems to reflect my main concern with QM. Here it is: Consider a series of polarisation-entangled photon pairs that are sent in opposite direction to two measuring devices (e.g. at opposite ends of the universe). The measurement consists of detection of a photon after...

hi alll...we know that by changing the polarity of phase and neutral , direction of ac motor can be changed. but is there any automated device that does this job? ...

Hello, What is VCD and how it work?

Hello. I'm studying physics for two years now and I have never bought a book [thanks to professor's notes, free and "free" books on the web]. I got tired of using the laptop, so I need something to read ebooks (pdf and djvu mainly and also epub). Is it better for this purpose an ebook reader or...

Hi guys I want to know if it is possible to construct a multi-spectral imaging device inexpensively as a vein finder. what would be involved? There is a med device that has augmented reality to it and has a lot of other functionality but i think it costs about 10-15k. My budget is about $1000...

Hi everyone, I am an undergrad student of psychology and I was curious is anyone from you would be interested to cooperate with me to discuss possibility about device which would help psychologists monitor data about patients. From what I know we can measure breath, pulse and even temperature...

I searched some forums like stackexchange and they were telling of technique called wakelock to keep a device on a website from dozing . But they seem outdated. Got a suggestion from somebody to embed a 1*1 pixel video loop on website so to keep device awake. But is making a 1*1 pixel looping...

How large would a superconducting magnetic energy storage device be if it were to safely carry 100 kilowatt-hours of energy? How much cryogen (liquid nitrogen) would it consume per hour if the device were made from high-temperature superconducting materials (YBCO or similar).

Hello, I tried to figure out that how smart window works and I had read several papers and web-pages. I did understand how colour centres in WO3 thin film works which is described at page 820 of the paper of Deb, S. K. Recent papers, related to electrochromic window, are using electrolytes...

Hi! I am a big fan of science fiction, military fiction and all sorts of media covering this kind of topic. :smile: So I have played Metal Gear Solid V: The Phantom Pain and in it there is this plot device called metallic archaea that basically enriches uranium quite easily. This invention...

I need a way to generate cool air outside when temperatures are 90s and above. Basically what I am thinking of doing is essentially like positioning a fan right beside a bowl of ice cubes. Only in my case, instead of using ice cubes, an electrically powered cooling device that can slightly...

Hello, I am new in this field, so maybe my questions will be stupid :) sorry for that :) In the company where I work, they measure flow rates of wastewater using Flow meter (Doppler device). The problem is, that the flow rate is very low, so this device is not submerged completely in the...

Homework Statement In a Young’s two-slit experiment a piece of glass with an index of refraction and a thickness is placed in front of the upper slit. (a) Describe qualitatively what happens to the interference pattern. (b) Derive an expression for the intensity of the light at points on a...

Does a router tells a slave device to close a TCP connection, if the router loses connect from the master device ? So, I have a Qterm-g72 HMI and I am trying to connect it to a Moxa over TCP Modbus. This only works if a Computer or a router is between the Moxa and the HMI. I am trying to found...

Hello, I will be conducting an experiment to create a sugar monocrystal, the device I will be using (apologies, English is not my primary language therefore I do not know all the proper terms) will be modeled and influenced by the one described in the paper "Soft-sensor for industrial sugar...

Hello. Sorry in advance for my ignorance, but I am looking for a reaction that will yield a colorimetric signal when an antigen and an antibody meet. Similar to a one-step ELISA. My plan was to use HRP-conjugated BSA and anti-BSA. Will this work, and in how many steps? Any kits out there for...

Homework Statement I'm designing a device for changing a load position from vertical to horizontal. It has a wheeled frame (2) which allows an operator to transport the load after reorientation. The combined centre of gravity of a rotating platform (1) and the load moves forward due to...

K so you have your computer screen, and speakers, but can they record too (input)!? My speaker vibrates by electricity to make sound, so why can't my voice make (these speakers) vibrate and send electrical signals back? A wire shoots out photons in x amount of brightness through a color-filter...

I am looking for some device that can emulate someone tapping with a wrench every 20 minutes. More specifically, I have noticed that in my application, my flowmeters (rotameters) are dropping over time. As a workaround I have been able to tap them with a wrench every 20 to 30 minutes, this...

These days, I designed a Bragg grating using FDTD Solution. But when I try to get its phase information of the transmission spectrum, I meet some trouble. Could anyone give me some suggestion? Which monitor should I choose? Or should I use INTERCONNECTION? Thank you !

Homework Statement A piston-cylinder device initially contains 0.5 m^3 of helium gas at 150 kPa and 20°C.Helium is now compressed in a poytropic process(Pv^n = constant) to 400 kPa and 140°C. Determine the entropy change of helium and whether this process is reversible, irreversible, or...

Hello everyone, I came across http://planetsave.com/2015/08/03/rain-tunnel-technology-provides-drinking-water-from-air/ and was wondering if this is actually possible? Thanks

Homework Statement A radar device detects a rocket approaching directly from east due west. At one instant, the rocket was observed 10 km away and making an angle of 30 degrees above the horizon. At another instant the rocket was observed at an angle of 150 degrees in the vertical east-west...

Hello, It's a theoretical question. I take 2 electrostatic particules fixed in a circle. I turn the circle. Is there a magnetic field ? I suppose the angular velocity very high and I suppose the particules are fixed in the circle. The diameter of the circle is very small. I don't want the...

Hello, lazy writer here. Got a question for you all; apologies if it's been asked before or needs to be moved. Assuming an advanced civilization controlled the Milky May for a period of ~16 giga years (from the galaxy's formation until the merger with Andromeda) and had all that time to work on...

Hi Everyone, This is Sentil from India. I'm a professional in the field of commerce. But i love science! then the obvious question "Why /How did you end up in Commerce". Thats really a long story. But today I am here to get help on one of the side projects i am into to develop something like...

Hi I was wondering if it's possible to make a Casmir device (2 uncharged plates in a vaccum)at home or does it need to be handled in a lab with a physicist operating it ?? And does this actually produce exotic matter/negative energy? What if the plates were 5 meters long in a vaccum??

I'm creating something as a side-project, but I've encountered a problem in a field I'm not well-versed in. There is a material I am looking to excite with a resonance frequency of 50 Hz. I need the smallest possible device to create the largest amount of vibration, I've looked into some small...

This is more of a user experience question. I'm starting to remake a game (see http://playclassicsnake.com/play ) that works on mobile just as well as desktop. On desktop, one controls the snake (the lime green links) with the arrow keys, but I need a different way to do it on mobile. I tried...

Hi, I imagined this device and I don't understand where is the error. I posted here because it's a simple mechanical device, I have trouble with the sum of torque. The potential energy must be constant. I think I forgot a torque, if you see where ? A torus turns counterclockwise around the...

Hi all, I am working on electronics material (using metal oxide as an active layer in TFTs). Currently, I'm trying to measure the sheet resistance (Rs) of CuO thin film (~100nm in thickness). My lab uses Agilent B1500 device for measuring the Rs. I met some problems when carrying out the...

I am working on a high pressure (280 bar - 4000 psig), high temperature (250 C - 480 F) system and I need a safety device that can vent through a 6" diameter connection. I would love some feedback on viable and practical solutions for this application. I am considering a valve, but I am not...

I want to get a half convex lens (thick in the middle, flat on one side). And coat it in thermally and optically reactive transition filters. They are to be segmented so to reduce spread of filtering. This will give a view of the sky with any bright light inhibited at the focus. Next to the...

1. I am supposed to create a device that can intensify the light directed at a light intensity sensor. A small light bulb will be 25 cm away from the light sensor. My device is required to be 20cm long and placed in between the light bulb and the light sensor in order to make the light that is...

Good day, TiO2 have many possible application in material science, one of this is in Memory device, base on some literature TiO2 had a good chemical stability at high temp, so this is one reason why TiO2 is best candidate for this application, but beside of that, what other properties of TiO2...

Homework Statement I am doing an egg drop project write up, and one of the components is to draw a general egg drop device diagram, and to write down the general forces which would act upon the egg drop device, both inside it, and outside it. Any suggestions? Homework EquationsThe Attempt at a...

I am attempting to read two hall-effect flowmeters through the audio-in (mic) port of an Android device. I want to be able to read both flowmeters independently. The audio-in port is a standard headset port so it only has one channel for the mic. So far I have been testing with my desktop PC. I...

Homework Statement Some time ago, an (in)famous paper by Trubnikov argued that magnetic fusion would be impossible because the power radiated by electrons would exceed any likely fusion power. He provided a very elaborate calculation, but the result was not greatly diffferent from the simple...

Hi every one i hope someone can give me an idea how to achieve that. I am working for at school project, where i am trying to build a device that measure density of a multilayer object/enviroment. I am thinking to achieve that by measuring the axial force exerced while pushig the device inside...

As the title says I am looking for some book to read and understand this world. I know many people say its impossible and that we can learn it by learning the math bluh bluh.. But i have passed 4 quantum courses and i know the math. I just can't get the touchable concepts ( i don't really know...

hey guys, i have recently thought about an idea to make a 100% efficient device. i have figured out that the friction can be eliminated by putting lots of lubricant. now i need your help to counter the problem of heat and sound. i really need those answers cause its for an inter college in which...

<< Moderator Note -- Dorea is an instructor asking about their physics lab >> The first experiment in our fundamental physics lab is "Measuring & Measurement errors". Currently we have four devices: - rule (0.5 mm) - Vernier Caliper (0.02 mm) - Micrometer (0.01 mm) - Spherometer We're seeking...

Reader, Forgive me if I break any of forum rules, as I am a newbie posting here. Today, last minute Christmas with my beloved other, I found some sort of vintage electrical device. I understand the basic principles behind what would be happening on the stand with electricity. However I am...

Homework Statement Steam at 550 bar and 475 °C undergoes a throttling expansion to 1 bar in a steady-state process. What will be the temperature of the steam after the expansion? Calculate the internal energy of the fluid. Homework Equations h2 = h1 The Attempt at a Solution the temperature...

Hey, I am new to this stuff and was just wondering if someone could help me i need to know what could i use to lift 180lbs about thirty centimetres off the ground, also this device has to be small but still powerful enough to lift the required weight i would appreciate any help i could get. Thanks

I need to obtain the forward and inverse kinematics of a pantograph device. It is easy when only the one side of the pantograph is considered; So, it becomes a 2DOF planar elbow mechanism, which is easy to solve. However, there is symmetry on pantograph, so I kinda need to combine two planar...