What is Mode: Definition and 324 Discussions

In x86 computing, unreal mode, also big real mode, huge real mode, flat real mode, or voodoo mode is a variant of real mode, in which one or more segment descriptors has been loaded with non-standard values, like 32-bit limits allowing access to the entire memory. Contrary to its name, it is not a separate addressing mode that the x86 processors can operate in. It is used in the 80286 and later x86 processors.

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  1. O

    To find out mode of vibration of air in a resonating pipe

    Homework Statement A cyclindrical pipe of length 29.5 cm closed at one end resonates with a tuning fork of frequency 864 Hz. Then mode of vibration of air in the pipe is(Velocity of sound in air=340m/s): The attempt at a solution V=Velocity, n=Frequency If l1 is the first resonating...
  2. V

    Replacing Monitors - Cannot display video mode

    Replacing Monitors - "Cannot display video mode" I'm switching out my old CRT Compaq FS7600 monitor (for specifications: see the link below) for a dell flat screen monitor. Unfortunately, this monitor says nothing about the model type, and I don't have the box as I got this from a friend. The...
  3. I_am_learning

    Synchronous Generator in Isolated Mode

    I tried simulating a simple synchronous generator driving a resistive load in isolated mode (not connected to the grid/infinite bus), using Matlab Simulink, SimPowerSystems. First I used, Input mechanical power of 1 pu, and output resistive Load of 1 Pu. And Excitation Field Voltage of 4 pu...
  4. B

    Experimentally observe waveguide mode pattern

    Hello: I am passing 1 micron laser light through some semiconductor waveguide devices with my research group. We would like to observe the mode pattern on an infrared camera. The thinking is that if we observe a well defined pattern at the output of our devices, then it will be an indicator...
  5. G

    Questions regarding equation for circular mode frequency

    I'm trying to determine the circular mode frequency for an open-ended pipe using the following equation and could use some clarification: f = (t/(2*d^2))*SQRT(E/density) f - frequency E - modulus of elasticity d - mean diameter t - wall thickness My first question is; do I need to...
  6. B

    How to derive the mode of a Gamma Distribution

    Do I take the derivative of the density fct and set it equal to 0, then solve for t?
  7. N

    Mode analysis of rib waveguide

    Homework Statement I am doing a 2D COMSOL simulation (RF module) of a rib waveguide of nanometric structure. My question is if there is any rules of thumb of distinguishing when the mode no longer is confined under the rib-structure. Homework Equations None The Attempt at a...
  8. H

    MATLAB Mode Function in MATLAB: Explained by Ivan

    Hi, I am a bit confusing on the mode function in MATLAB. I have look throught some books and say we can use mode function to find "the most show up value" and "show up how many times". For example : r = 2 2 3 3 3 3 4 2 1 the most show up value is...
  9. O

    Cantilever Beam First Mode of Vibration

    I developed a COMSOL model and calculated the first 6 modes of vibration of cantilever beam. Later out of curiosity, I looked up some videos on youtube to see actual cantilever. I found this video which shows the first mode. How do you know that its first mode of vibration? More...
  10. I

    Mode of a probability distribution

    Homework Statement I have a luminosity prob distribution that i want to plot and find the expectation value and mode for. Homework Equations p(L)dL = A \frac{L}{i}^aexp(-\frac{L}{i}) \frac{dL}{i} A=const a= -0.7 i= 1.4e10 solar luminosity units lower limit = 1e9 solar luminosity...
  11. V

    How Does the Refractive Index Change with Frequency in Plasma Mode?

    Homework Statement Attached as pdf. Homework Equations Attached as pdf. The Attempt at a Solution I know that refractive index is given by n=\sqrt{\varepsilon} normally. But is it still the case when asked for n( \omega) ? If so, I've tried rearranging equation 3 for...
  12. M

    Optimizing Organ Pipe Modes with Vent Holes

    Homework Statement Where would you locate a small vent hole to encourage the third mode of an open pipe? The fourth mode? Homework Equations Hint: Where is a node of the desired mode? The Attempt at a Solution Does this mean 1/3 of the way down for mode 3 and 1/4 of the way down...
  13. jegues

    Min. Common Mode Input MOS Diff Pair with Current Mirror

    Homework Statement See first figure attached for problem statement. Homework Equations The Attempt at a Solution I've solved everything in this circuit, I just have some confusion about solving V_{CMmin} when I have a current mirror acting as my current source connected to the...
  14. U

    Comp Sci C++ Mode calculator problem (noob having problems)

    Homework Statement Just as a background this is my first time ever learning to program. I am in an engineering C++ class. I had to write a program that took in ten random numbers and then found the mean median and mode. I got the first two and was able to figure out how to sort correctly. But...
  15. S

    Natural Frequency and mode shapes

    Hi I am using Ansys to find the natural frequency of a structure but this has meant that my understanding of vibrations has become unstuck. When I last studied natural frequencies, it was under free vibration. I formed the impression that one structure can have only one natural frequency...
  16. G

    Mode shapes in experimental modal analysis

    Hi, I am doing experimental modal analysis of a cylindrical casing. I have 64 FRFs. I have curve fitted dominant modes and obtained a synthesised FRF. Now when I see the animation of mode shapes corresponding to each of the frequencies in FRF, I am finding a not-so-significant (amplitude...
  17. D

    Buck converter in continuos mode

    Hello, I don't quite understand the buck converter in continuos mode ... looking at the graph for inductor current on wikipedia, at t=0, there is a nonzero inductor current, Imin ... how is this possible when the inductor current cannot change instantaneously (assuming it starts at zero...
  18. P

    Uncertainty of room mode frequencies

    Hi - I'm new here - I'm just writing a paper based on an acoustical analysis of a rock/pop performance venue in a college I work at, and I'm up to my uncertainties section. I've read up on uncertainties, and feel confident in working out uncertainties for simple additions, multiplications...
  19. H

    Understanding Normal Mode: What is it?

    hi what is the exact definition of normal mode?
  20. L

    Voice coil motor force control using slow decay mode

    Hi, I am trying to control a voice coil motor's force, which is directly proportional to the current through its coil. The direction of the force needs to be reversed, so I thought an H-bridge would be a good way to do it. I have read a lot about H-bridges but I am still confused about a few...
  21. B

    Transverse mode output from a multimode fiber using TEM00 laser source?

    If a TEM00 output laser source (regarding both cases of single frequency vs multifrequency) is used as input into a multimode optical fiber, is it possible for the output of the optical fiber to be multimode?
  22. jfy4

    Particle Decay Mode Percentages

    Hi everyone, I find the following table from WolframAlpha concerning the probability of various decay modes of the pion \pi^{+}. My question is: Are these probabilities calculated, or are they numbers from numerous experiments? Thanks,
  23. K

    Is real mode limited to 16-bit instructions on the 8086 processor?

    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?
  24. L

    RLC-circuit normal mode calcuation

    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...
  25. S

    Wave vector of a polariton mode

    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.
  26. W

    When to consider yielding vs. rupture as a mode of failure?

    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...
  27. S

    Single Axial Mode And Spectral Hole Burning

    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...
  28. D

    TE mode in rectangular wave guide

    Homework Statement I'm following Jackson and solving the problem, but I came to a bump. I've found B_z component of the field (for the lowest mode \omega_{10}), and since it's TE mode I should use: \vec{E}_t=-\frac{\omega}{ck}\vec{e}_3\times\vec{B}_t \vec{B}_t=\frac{ik}{\gamma^2}\nabla_t...
  29. P

    MATLAB FEM for natural frequencies and mode shapes of a beam

    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...
  30. H

    Soft Mode Theory: Understanding & Implications for H.B

    Dear all, I have trouble in understanding the soft mode theory. It says the short range force constant (ks) corresponds to the force that pull the atom back to the equil. position and the long range force constant (kl) corresponds to the force that is reverse. When temperature is low, the ks...
  31. T

    Calculating Gain in Current Mode Filters: Current Gain vs. Voltage Gain

    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...
  32. Demon117

    This code keep giving me 0 for mode

    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 =...
  33. Phrak

    Rectangular wave guide, TE01 mode

    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)...
  34. O

    Statistics question about mode

    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.
  35. T

    Is the normal mode frequency of harmonic oscillator related to temperature?

    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...
  36. P

    Programs Entering a slight panic mode about my major 0.o

    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...
  37. Y

    Question on TEM mode transmission lines.

    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...
  38. R

    Depletion Mode Transistor

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

    Radiating mode vs Coupled mode leaky cables

    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...
  40. P

    Crankshaft Failure Mode Analysis

    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?
  41. M

    Understanding Resonant Frequencies: Investigating Modes in a Resonance Chamber

    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 =...
  42. U

    Discrete Model for Buckling Mode Shapes of a Clamped-Free Column

    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...
  43. S

    Question on Mode locked laser pulse train

    Homework Statement I have a question to calculate the spectrum of an infinite pulse train from a mode locked laser with each pulse having I(t) proportional to exp(t^2 / tau^2) where tau is the pulse width. tau is 50 fs, repetition rate is 100Mhz, wavelength of operation is 800nm. Please...
  44. B

    LaTeX LaTeX Code Distorsion in Forum Edit Mode

    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...
  45. M

    Calculate in rad or deg mode for sin(wt)

    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...
  46. T

    Understanding Nodes and Frequencies in a Uniform String Under Tension

    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...
  47. O

    Pipes and resonant mode with a node in exact center

    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...
  48. N

    Calculating Mean, Median or Mode for Ace-Inhibitor Patients

    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...
  49. wolram

    How Does B Mode Polarization Help Trace Gravitational Radiation?

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

    Mean, median, Mode, standard deviation and 10th and 90th percentiles

    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...
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