Mode Definition and 295 Threads

Hello Does anyone know if its true that all software running in real mode must use only 16-bit instructions? is there an authorised sourcet that can aprove od deny it?

Homework Statement The following circuit is given. C1=C2 L1=L2 R1=R2 I shall calculate the "normal mode" (I'm not sure if this is the 1:1 translation though) of the oscillation Homework Equations formula for electrical impedance and differential equations The Attempt at a...

Hey, I'm looking for a method for calculating the wave vector of a polariton mode with a given frequency f knowing the static and high frequency dielectric constants of InP (\epsilonst and \epsilon\infty) and the TO phonon frequency \upsilonTO. Thanks for your help! S.

Are there any general rules of thumb for which to choose? I have a lot of ambigous HW problems which don't specify, they just list a safety factor. For example, if I have a mass hanging on a metal wire with a specified safety factor, then I mean it will buckle at the yield strengh but only...

Reflection at a surface takes place under the condition that the field amplitude is zero at the reflecting surface. As a result, the axial modes i of wavelength λi inside a laser cavity can be defined by their number ni of sine-wave half cycles that fit exactly into the laser cavity. The optical...

Homework Statement Model the above beam with 3 elements(image provided in attachment). Calculate and list the first 6 natural frequencies Plot the mode shapes corresponding to each of the natural frequencies Homework Equations DET(M^{-1}*K + [I] \omega^2)=0 shape functions...

How to you calculate the gain in a current mode filter (of any current mode circuit in general) For a voltage filter you have G= Vout/vin Do you also use the Current gain (G=Iout/Iin) to simulate the behavior of a current mode filter or should you convert the currents to voltages and...

This is the code I have: #include <iostream> #include <cstring> using namespace std; template <class X> X mode(X *data, int size) { register int t, w; X md, oldmd; int count, oldcount; oldmd = 0; oldcount = 0; for(t=0; t<size; t++) { md = data[t]; count =...

Rectangular wave guide, TE01 mode I'm looking for the equations of the electric and magnetic fields over the volume of the rectangular guide. I've managed what appear to be the correct equations for the electric field, E_y = sin\left(\frac{2\pi z}{\lambda_z}-\omega t\right)...

is will be correct if i will say that the graph number III has the larger mode between the 3 graphs ? if i wrong how can i know which graph has the larger mode? thanks.

It is well known that for an isolated system, the normal mode frequency of a N-body harmonic oscillator satisfies Det(T-\omega^{2}V)=0. How about a non-isolated, fixed temperature system? In solid state physics I have learned that in crystal the frequency does not change, but the amplitude of...

Hi everyone! I'm trying to figure out my major and have run out of time. Here's some quick background on me. I've finished all my gen. ed. classes and only have my major classes to take now. I have to decide by this summer. I'm currently a History major, but have no idea what I would do...

I want to verify the theory of TEM mode tx lines how the signal travel. Please correct me if I am wrong. This mainly refer to stripline, microstrip( assume TEM) etc. 1) The signal is transmited as EM wave through the dielectric between the two lines, not actually current through the...

When do you use an internal substrate connection vs an external substrate connection on a depletion mode transistor?

I am trying to understand how leaky cables work, and especially those that permit higher frequencies (I think about 2.4GHz), but I am quite new to electromagnetics in general. For clarification, leaky cables are usually coaxial cables that have apertures in their outer conductor from where an...

I have a broken crankshaft where I am trying to determine the cause of failure. here are some pics of the cracked surface. what is known: 1) the crank shaft was under very light load at time of failure What do you guys think?

Am doing a project about a resonance chamber, investigating resonances frequenies and hows different variables can affect them but need some clarification on the modal numbers so resonant frequencies are found from f=(c/2)[(Nx/Lx)^2(Ny/Ly)^2(Nz/Lz)^2]^1/2 find values using n =...

the buckling shape for clamped-free column is v(x)=1-cos(n*pi/2*L), n=1,3,5 ... how could i use the discrete model to get the buckling mode shape matrix? for example 3x3 matrix form a stiffness matrix and solve the eigenvalue problem? L=1;E=1;I=1 l=L/3 % 3-element beam...

Hi. When I write my LaTeX code in this forum, it appears completely distorsionated when I click "Preview Changes" in edit mode. For example: n^2(\rho) = n^2_0\left(1-\alpha^2\rho^2)\right) is shown as a "z" if previously I wrote z. In fact, I don't know if this post will be shown well...

Homework Statement A simple question: do i calculate in radians or degrees mode on the calculator for sin( w t) where w = omega(rad/s) and i am given w = 50 rad/s and t = 5 s Homework Equations The Attempt at a Solution Would i have to calculate sin(250) in radian mode since...

Homework Statement A uniform string of length 2.5 m and mass 0.01 kg is placed under a tension of 10 N. 1. What is the frequency of the fundamental mode? 2. If the string is plucked and is then touched at a point 0.5 m from one end, creating a node, what frequencies persist? Homework...

Homework Statement What kind of pipe can never have a resonant mode with a node in the exact center? (choices are closed on both ends, open/closed on one end only. open on both ends) why? Homework Equations none given The Attempt at a Solution I think its closed on both ends...

Homework Statement You are asked to estimate of the most common level of a ace-inhibitor taken by patients who take the drug. Give your best estimate of central tendency. These are the measurements 0.0 12.5 13.6 14.5 12.0 13.2 0.0 0.0 13.1 14.2 12.5...

This seems to crop up a few times now, how does it help to trace gravitational radiation?

Homework Statement I have two sets of data, each with 30 distances and 30 results, I have the mean, median, mode, range etc, I have drawn histograms and cumulative frequency curves, got the IRQ for both sets of data. Now I need to compare the data using standard deviations and also find...

Anyone know how I get LaTeX in Math Mode to work in a post. I tried putting the LaTeX commands between the "CODE" delimiters but to no avail. I used it once before on these forums but it was long ago and I forgot how to use it.

Hello all, What does it mean when two phonon branches get crossed in phonon dispersion relation ? Also, in certain high symmetry direction, one can find only one transverse branch and other direction two separate branches, what do these response mean? (Ref. Solid state physics by...

Hello all, This is not a homework problem. Just to understand the two doubly degenerate mode of D4h symmetry i wanted to make sample calculation. Pt in the middle of a square formed by 4 Cl atoms. PtCl4 has square planar structure (AB4) molecule. 1. What is the whole charge of PtCl4 ? Is this -2...

Hello all What is the definition of Normal mode? And what is the difference between normal mode and phonon? Are they same? Thank you!

For this question I'm not going to introduce the particular problem I am working on, rather, I am merely wanting some explanation of a concept which I can't seem to find in any of my textbooks. I suspect the authors think it is just too obvious to bother explaining :smile:. I'm revising for a...

Hi friends, My air conditioner is a split one (it has 2 parts: one inside the house and the other outside). It has 4 modes of operation: cool, fan, and 2 other modes. My question is that what does the machine really do in the fan mode? I wonder whether it just serves as a normal fan...

Delayed choice in half silvered mirror or double slit For now, I am focussing only on the half silvered mirror: there are two paths/arms that are created. My question is: 1. If a detector/obstruction is placed on either of the two paths after the photon has passed but before its hit...

Im working through derivations of string equations of motion from the Nambu-Goto Action and I'm stuck on something that I think must be trivial, just a math step that I can't really see how to work through. At this point I've derived the equation of motion for the closed string from the wave...

2 metal, thin, bars (length=l, mass=m) are hunging on same height (distance between bars-d) Lower end of bars are conected by metal spring (mass=0, k-spring constant, d-length) My problem is how to calculate a normal mode.

Hi, If I have two different light modes focused onto a single spot, could they interfere? Thanks

Hi, I am planning to use SPI mode to interface a eZ430-RF2500 with a Sandisk Secure Digital Card. The eZ430-RF2500 includes a MSP430 microcontroller and a CC2500 RF transceiver. According to the schematic, the RF transceiver interfaces the MSP430 utilizing the SPI mode, using the SOMI, SIMO...

What is the actual definition of the TM mode? A typical definition that I've come across is that there is no Magnetic field component in the direction of wave propagation. As it is an EM wave, according to that definition the Magnetic field should be in the plane normal to the direction of...

Can anyone provide a brief explanation what an EM mode is? I've read some EM theory, but still have problems understanding what a mode really is! I know for some EM waves, the medium supports only certain modes, but is the 'mode' a property of a medium? Or is it something that should be...

Hi everyone, Can anyone explain how to use the PDE mode in COMSOL Multiphysics? I used the heat transfer package to model a piece of copper undergoing a change in temperature from 6 Kelvin to 300 Kelvin. Now I want to check to see that I can get the same results with my own equations. I don't...

Homework Statement Find the average area of an inscribed triangle in the unit circle. Assume that each vertex of the triangle is equally likely to be at any point of the unit circle and that the location of one vertex does not affect the likelihood the location of another in any way. (Note...

Why does DCM work the way it does? Because it makes no sense (To me, obviously). Not how it works. Why it works. The intuitive form, to me, would be that a lighter load would mean more time before the loop discharges, (due to tau = L/R) but apparently it's the other way around in a buck...

i hav to find out why the key in output pulley fails due to sudden forward and reversing(in gearbox of lathe)i did some theoretical calculations in crushing & shear stress.please tel some solution regarding analysis of the key

Homework Statement For an air-filled waveguide rectangular wave guide with the top and bottom made of PEC and the left wall made of PMC and the right wall of PEC. The dimensions are a=5cm b=3m. Find the dominant mode propagating in this wave guide (a is length and b is the height) Homework...

is there any book discussing goldstone mode? i am not very familiar with field theory. Could anyone suggest some books accessible to a non-field-theory theorist? i guess the acoustic phonon is a goldstone mode but the optical phonon is not. Since a goldstone mode is associated with a...

For 8086 assembly language.

Hello, I studying General Relativity at University of Chicago and I am looking for information regarding "Fourier-Harmonic Mode Decomposition" or mode decomposition in general and "Retarded Greens Functions" and retarded fields in general. Does anyone have advice about where is a good...

I accidently got into AM radio mode in my car for the last two days, and I can't figure out how to take it back into FM because there isn't a stupid AM/FM button. I had to have hit some funky combination of buttons to go into AM and now I am stuck. ANYWAYS, I've been stuck with this AM radio for...

Hi Can someone help me on how i can calculate the input common mode range for this pmos diff pair. I'd have an idea if it was an NMOS diff pair but am kinda uncertain of this. I'm looking for equations for the input signal ranges of Vmax and Vmin Thanks

So we just went over waveguides in my class, in particular the TE and TEM modes (for a perfect conductor with two infinite planes for waveguides). I know that according to boundary conditions (assuming perfect conductor), the transverse electric field components must be zero at the boundary...

There are a couple of things I don't understand about the DA in general and when we use it in the common mode in particular (same input ac voltage to both input terminals). I am using Electronic Circuit and Theory by Louis Nashelsky and Robert Boylstad (p.591 for DA). When we set the...