Channel Definition and 168 Threads

MODERATOR NOTE: THIS HOMEWORK WAS SUBMITTED TO A NON-HOMEWORK FORUM SO THERE IS NO TEMPLATE Hi everyone, I'm stuck on a fluid mechanics problem and maybe you could help me. As shown in figure, there is a two-dimensional converging channel, in which cross-section area varies linearly with x...

I know this is easy but i need to know the flow velocity through a pipe reducing in diameter inside a canal. the water velocity is 3m/s water depth is 1.5 m the pipe is at the bottom inlet diameter 0.9m small reduced diameter 0.6m outlet diameter = 0.8m note: this is an open canal with...

I am currently designing a whole-core for small PWR. I am calculating core life (years) vs. FdH and RFF. What is the difference between "Enthalpy rise hot channel factor (FdH)" and "Radial form factor (RFF)"? I have calculated "CHANNEL FDH" which is same as "RFF". Do I have to try "CHANNEL...

Hello, I was wondering if there exists a decent radio channel which main focus would be science/technology and academia ? I'm listening radio pretty much all the time while working, all I could find were "sensational" tech talk show about UFOs, zombies and time travel, nothing serious. The...

I am currently working on thermal-hydraulics of a small PWR. The configurations are: Thermal power (MWth) 333 Core height is 1.8 m Pressure (MPa) 15.5 Total rod diameter (mm) 9.50 pin pitch (mm) 12.65 Pitch/diameter ratio 1.33 Flow Area (m2) 8.92E-05 Intlet mass flow/area (kg/m2/s)...

Me and my friends have been trying (b) for soooo long! we have gone to PhD students and some fluid dynamic doctors for held and they cannot figure this out. 1. Homework Statement 2) This question concerns the design of a ‘micro-chemostat’ device. E. coli exhibiting chemotaxis can swim up to...

Hi.. I take a high school physics Olympiad. Could you please tell me what the best physics video channel on YouTube or other sites ? I'm looking for videos that gives an overview to an advanced problem (It can be IPhO level) and guide to the solution step by step..

I'm going back to basics again in an attempt to add golang to my list of "pretty well learned" languages. What I need to do should have a pretty simple solution: I want to ignore a request to get a result from a channel in golang, if you need to know the particular situation I have a link to my...

Hi, I am designing a PCB with multiple 2-pos DF13 connectors in it (Like 50+). at the end of the board there is a 10 pos. cable. My intent is that the user (me) connects up to 9 channels in any position I like (I have 50 possible choices). However, this board is connected to another PCB that...

In Sedra&Smith's microelectronic circuits they have the following expression for the drain current in a MOSFET in saturation iD = 1/2µpCox(W/L)Vov2(1+VDS/VA)But I don't see how this can be correct. Wikipedia also has another expression, see...

Homework Statement Nerve signals in the body occur when a small voltage, called an action potential, is applied across the membrane of a cell. When this action potential is applied across a region of the cell membrane called an ion channel, current in the form of moving potassium ions will be...

Hello everyone, I would like to get ~200 MeV quasi-monoenergetic electron beam by doing 2D Particle-In-Cell simulation in bubble regime. The moving window dimension is 50x50 μm for x and y, the simulation mesh size is set 0.04x0.4 μm, each mesh includes 10 particles, laser wavelength is 800 nm...

I am attempting to determine the allowable uniform load on a 8ft long C3x5 steel channel A36 steel. i got an answer of about 2,455lbs but idk if that's right. if there is an easy equation to follow or if you know of a table online somewhere that can help that would be awesome! thanks in...

Interesting Hist Channel show on Star Trek and Physics: https://www.youtube.com/watch?v=vNiDoT7blX8 Of particular interest is the number of scientists who were influenced by Star Trek in their youth.

So my friends and I want to start a youtube channel doing stuff with math and physics and such, but we can't come up with a clever name, any suggestions? Thanks!

In terms of unit material spent my impression is that an I beam uses it most efficiently at least for non-torsional loads? i.e. putting most material far from the axis into the flanges giving higher moments. If so, what are situations when an angle or channel cross sections are preferred in...

if you have a two Channel Microphone, what does that mean ? do you have to separate the right and left channels before you send it to a FFT? if so why?

Hello Everyone, As a long-time University Teaching Assistant in Statistics, I have recently launched a YouTube Channel with the idea of providing help for students who are taking courses in introductory statistics and probability. The videos it contains are the online equivalents of the Review...

Really quick question. In a graph like this: http://en.wikipedia.org/wiki/File:Cs137_Spectrum.PNG Source What does the Channel Number represent? Also, just to make sure, am I right in saying the count rate is \frac{\delta m}{\delta t} ? where m is the cumulative number of scintillations and...

Consider we have a \Lambda type three level system, the one upper level is denoted by 3, and the two lower levels are denoted by 1 and 2. Assuming that the transitions between 1\leftrightarrow3 and 2\leftrightarrow3 are dipole alowed, while the transition between two lower states 1 and 2 is...

Suppose we have a case of laminar flow in a channel. For a case of constant flow rate, at some point downstream of the channel inlet, the hydrodynamic and thermal boundary layers will merge and simultaneously developing flow will transition to full-developed flow (not necessarily at the same...

Hi, I'm new. :biggrin: I'm currently studying A-levels, and I'm going to study astrophysics at uni, so I may be on this website quite often asking questions in the future! Secondly, I have a question. Why is there LIQUID water under Enceladus' surface? Is it similar to Europa around Jupiter...

Hi everybody! I would like to ask you two things. Some months ago i watched some documentaries on Discovery Channel but i don't remember the title! I can only remember that they was talking about p-brame theory and that some physicists wasn't able to describe it! And in anther they were talking...

1. An oscilloscope is used to measure the voltage across two components using Channel A and Channel B. Deduce the RMS voltage of the signal measured by Channel A I just want to know what they mean by "deduce the RMS voltage" Do i need to calculate the Vrms?

Hi, how can I find 4 channel oscilloscope in multisim 11.0? or how can I add 4 channel oscilloscope to multisim?

Homework Statement A rectangular channel has a width of 2 meters, and an slope of 1:80. The Manning's number for the entire channel is n = 0,014. In this situation the depth is y= 1,50m. The flow of water is normal. Further down the slope decreases to 1:150 and the width increases to b=3...

Well I was reading this " A Mathematical Theory of Communication" paper by Claude Shannon. He says that the capacity of a discrete channel is given by [ tex ] C= \ \lim_{T \to +\infty} \ \frac{\log ( N(T) )} {T} [ \tex ] Here N(T) is the number of possible sequences in a duration of T...

Hi everyone, I'm Designing a BiQuad antenna for WiFi applications. The design and optimization are relatively simple but i need some references of the theory behind this antenna. I'm reading some theory of Bi-Conic Antennas but it's a bit difficult to extrapolate the idea between both...

Homework Statement A 4m wide channel has a bed slope of 1 in 1500 and a Manning's roughness coef n=0.01. A broad crested measuring weir in the form of a streamlined hump 0.4m high spans across the full width of the channel. the discharge is 10.5m^3/s. Determine i)the uniform depth of flow...

why waveforms should be compatible with transmitting channel? What if i send a random wave without having much information about it?

Homework Statement The biochemistry that takes place inside cells depends on various elements, such as sodium, potassium, and calcium, that are dissolved in water as ions. These ions enter cells through narrow pores in the cell membrane known as ion channels. Each ion channel, which is formed...

Hi all, I got an idea why noise is having a gaussian pdf but didnot understood why it should be having zero mean. Why can't noise contain a dc content. -Devanand T

A paper I am reading says My question is, "What does this mean?" The paper deals with WIMP annihilations into a photon and a Higgs which I suspect occurs via a fermion loop. I seem to recall that such triangle diagrams yield amplitudes proportional to the mass of the fermion in the loop (which...

Homework Statement Water flows down a channel whose floor is porous, so that water seeps out of the bottom of the channel at a speed v, where v is constant and much less than the flow speed, U, along the surface of the channel. The seepage rate is slow so that H may be regarded as constant...

I've just seen a program(me) on the National Geographic Channel entitled: "Confederate Flying Machine", which started out as an attempt to concept-test a design for a "Artis Avis" ("Artificial Bird", or aeroplane) by Confederate inventor R.O. Davidson, but soon became a concept test of the...

Homework Statement If in an open water channel, the approach speed of an incompressible ideal fluid, of constant depth h1, is not too large, a small bump in height H (H<< h1) in the base of the channel will cause a dip Δh (Δh << H) in the water level directly above it, such that h1 = Δh + H...

The problem: A canal cut in rock (n= 0.030) is a trapezoidal in section with a bottom width of 6.10m and the side slopes of 1 on 1. The allowable average velocity is 0.76 m/s. What slope will produce 5.66 m^3/s? The books answer is 0.000675 from the mannings equation V=(1.486/n)R^2/3 x...

Hi I am look for a mathematical queuing model that can help with/solve the following scenario. I believe this scenario can me modeled in a dynamic simulation, but I am in need of a solution for a static model. Scenario: You are at a port. There is a steady, equally distributed arrival...

I'm trying to prove that the Holevo quantity does not increase when a channel is applied to the ensemble of states. So, if \Phi(ε) = { (p(a), \Phi(ρa)) : a\in\Gamma}, then I want to prove that \chi(\Phi(ε)) ≤ \chi(ε) where \chi refers to the Holevo quantity. I'm trying an...

Hello, I posted this here because it is for a bit of course work, but I am just looking to confirm if I am using the right equation. I hope this is ok! If not, sorry! I just didn't think since I was asking a specific assignment question, I would post here. I need to investiage how changing...

I purchased a 6gb set [3x2] tri channel ram chips. One of the chips is apparently doa. It appears replacing it with an identical 2gb chip is not necessarily guaranteed to work. Any suggestions?

Homework Statement The aim of this exercise is to derive and simulate the error rate performance of binary PSK when the signal is transmitted over a single-path (or frequency non-selective) slowly fading channel. The frequency-nonselective channel results in multiplicative distortion of the...

I'm playing around with an oscilloscope and my laptop's headphone jack. I get the tip/ring/ground and measure between them. I also measure between them and an external reference ground. I notice I can see when the battery is charging. That is, if the battery is not in the laptop but the AC is...

History Channel, great review "Joking!" This article at cracked dot com is really spot on and funny to boot. I did find one bad word on the page, so don't read that word. The entire article is worth reading. I especially love their table at the beginning. It made me *snork*. :-p...

I know this is a physics forum, but someone may be able to help. I have a mini-hifi that I want to use the tape player connections from as an aux in. I've soldered a stereo cable into the connections on the hi-fi as shown in the electronic diagram. The left channel works fine, without any...

The Sandy Bridge only has dual channel RAM, which is why the Nehalem pulls ahead in memory-intensive applications and benchmarks. Will the Ivy Bridge include triple-channel memory? The Ivy Bridge is a 22nm die shrink of the Sandy Bridge. And when will the 8-core chips from AMD and Intel be...

Presenting its programming http://www.tvweek.com/blogs/tvbizwire/2011/05/cable-channel-greenlights-thre.php" Tuesday at the upfronts, History Channel made the announcement that it is greenlighting three new unscripted shows, Deadline.com reported. The new unscripted shows are "Invention USA," in...

Why is it that a P channel MOSFET is always operated with Vds < 0 i.e source positive with respect to the drain? The book says that carrier always needs to flow from the source to the drain, but would the reverse operation harm the MOSFET in any way? Please explain. Thanks.

Hi Let us suppose we transmit the binary digit '1'. The probability of not receiving '1' is p. Thus the probability of receiving '1' is 1-p. Suppose we send a longer code of length n. The probability of this code being received correctly is (1-p)^n. Now I don't understand this next...

Hi there, I'm a bit beffudled by some of the workings of a MOSFET transistor. First of all, in the saturation region of operation, I understand that the inversion channel is "pinched off" as it approaches the drain. In other words the inversion channel thickness tapers off as it approaches the...