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. S

    LaTeX Using LaTeX for Math Mode on a Post

    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.
  2. D

    Phonon dispersion relation : meaning of mode crossings

    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...
  3. R

    Understand the two doubly degenerate mode of D4h symmetry

    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...
  4. D

    Diffrence between Normal mode and phonons

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

    Coupled oscillators - mode and mode co-ordinates

    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...
  6. R

    The fan mode of an Air Conditioner?

    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...
  7. S

    Hypothesizing on photon mode of travel in double slit or similar experimental setups

    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...
  8. B

    Mode Expansion of Closed String with Compact Dimensions

    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...
  9. B

    Calculating Normal Mode: 2 Bars & Metal Spring

    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.
  10. A

    Imagination vs Knowledge: Analog vs Digital Views

    as we know that imagination is more important than knowledge. buttttttt,,,, in what mode it is good to imagine? i mean to ask that imagination is better in which view 1. analog view 2. digital view ??
  11. W

    Interference between different mode of light

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

    Standing Waves: λ, Mode #, Nodes & Antinodes

    2.2 Suppose you have a string 8 meters long. Briefly explain why it will be possible to set up standing waves with λ= 2 meters but NOT with λ= 3 meters. 2.3 Suppose standing waves of wavelength λ= 3 meters are established in a rope 6 meters long. i. What mode number is this? ii. Not counting...
  13. M

    Using SPI mode to interface msp430 with RF transciever and SD card

    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...
  14. D

    What is the actual definition of the TM mode?

    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...
  15. D

    Brief explanation what an EM mode is?

    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...
  16. M

    Using PDE Mode in COMSOL to Model Temperature Change

    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...
  17. C

    Solving an area problem in Multivariable Calculus, Polar mode

    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...
  18. N

    Discontinuous Conduction Mode (Buck-Converter)

    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...
  19. S

    What solutions can be used to analyze key failure in a lathe gearbox?

    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
  20. G

    Finding the Dominant Mode in a Rectangular Waveguide

    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...
  21. W

    Acoustic phonon as a goldstone mode

    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...
  22. K

    Which Addressing Mode is this? MOV DX, ES:[BX+6]?

    For 8086 assembly language.
  23. Z

    Help: Mode Decomposition and Retarded Feilds and Green's functions

    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...
  24. Cyrus

    Stuck in AM Radio Mode: Ranting and Raving on the Airwaves

    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...
  25. B

    PMOS diff amp - common mode input range

    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
  26. R

    Understanding TE Mode in Waveguides: Effects of Linear Polarization

    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...
  27. C

    Differential Amplifier Common Mode Problem

    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...
  28. J

    Normal mode of string in third harmonic

    Homework Statement A string that is fixed at both ends is vibrating in the third harmonic. the wave has a speed of 186m/s and a frequency of 225Hz. the amplitude of the string at an antinode is 0.0037m. How much time does it take the string to go from its largest upward displacement to...
  29. N

    Calculating the mode of a distribution from the characteristic function

    Is it possible to exactly derive the mode of a probability distribution if you have the characteristic function? I cannot get the pdf of the distribution because the inverse Fourier transform of the characteristic function cannot be found analytically. Any thoughts would be appreciated...
  30. I

    CCMRR Common to Common Mode Rejection Ratio

    I understand Common-mode rejection ratio. I do not however understand common-to-common Mode rejection or common to differential mode rejection or differential to common mode rejection. I am looking at this in regard to twisted differential pair cabling, specifically jacks. I can find the term...
  31. N

    Frequencies of the normal mode in standing waves in a string fixed

    hi,im a newbie over here,my physics quite poor so i really need help by understanding it,i jz wanted to ask could any1 please explain to me what is in phase,&out of phase?;im totally baffled.:blushingAnd what's frequencies of the normal mode in standing waves in a string fixed in both ends?i...
  32. K

    Why fundermental mode of open-end string like that?

    I am so confusing why the fundamental mode of one-open-end string must satisfy that one-fourth wavelength equals to the length of the string. I read four textbooks but none of them tell why it is. And one textbook said we must make sure dy/dx=0 at the open-end, but I don't understand why.
  33. W

    Cool resonant mode demonstration

    Here is a nice demonstration of resonance and vibrational modes.
  34. Chandra214

    Configuring USB Devices for Low Power Mode

    Hi all, set up: USB devices in power mode have three types a. high power mode ( 500mA) b. Low power mode ( 200mA) c. Self powered mode. in one of our applications we are configuring the device as low power device at the descriptor level ( Software). Once the host has the device...
  35. C

    Magnavox TS2560 B101 demo mode

    Hello. I have a Magnavox TS2560 B101 television that is stuck in demo mode. My parents have thrown away the manual along with the remote, and none of the keys on the TV will work. The demo mode simply shows all the TV's features, and plays continuously. The only way to turn the television off is...
  36. A

    Mode of a PDF - all data are unique

    Question is what is the mode when all data are unique? have a set wherein the actual question is what is the inference about the PDF for the data? Median > mean but no mode...i was under the impression that PDF is only for a continuous measurements...when data set is unique...in which case it...
  37. rootX

    Web browser to get 'privacy mode'

    This news was saying that IE will get privacy tools in 2008 http://news.bbc.co.uk/2/hi/technology/7574265.stm There's another browser (mentioned in the above article) http://xerobank.com/personal_intro.php that allows secure surfing at 1$/month? I was wondering doesn't Firefox have it all...
  38. K

    Normal mode and eigenfrequency

    What is the difference between eigenfriquency and normal mode? If, for example, I solve the secular equation (from the equations of motion) for a mechanical system (say two masses on springs) to obtain the eigenvalues I thought I got the normal modes, but now I am told I get the...
  39. Y

    How to detect the TE mode and TM mode?

    If there are TE mode and TM mode in an optical waveguide, how to detect them? Thank you!
  40. M

    Common mode noise and balanced detectors

    I'm working on a laser interferometry system that uses a pair of balanced photodetectors to record the signal. Each detector is on a separate port of a beamsplitter cube, and as a result receives (in theory) the SAME signal. The rationale for using the balanced detectors is that "they reject...
  41. I

    Waes: normal mode frequencies for 1 fixed extremity

    Homework Statement A String of length L has one of its extremities fixed and the other one loose. A. What's the equation for the normal mode frequencies? B. Draw a snapshot of the string for the 1st 3 normal modes Homework Equations wave equation The Attempt at a Solution...
  42. O

    Engineering PMOS Transistor Circuit - Is It Enhancement or Depletion Mode?

    Here is the problem: The PMOS transistor in the figure is conducting current. (a) Is V_TP > 0 or V_TP < 0 for this transistor? (b) Based on the value of V_TP, what type of transistor is in the circuit? (c) Is the proper symbol used in this circuit for this transistor? (d) If the symbol...
  43. M

    MATLAB Run Dos Program from MATLAB on Leopard & Windows XP

    I am running MATLAB on Leopard, i need to run a dos program via MATLAB script file. I also have windows xp running with parallel desktop. my m file is in the same directory as the dos program, on my virtual xp drive. i have tried using commands such as system and dos.. but to no avail...
  44. I

    Lowest freq mode of fixed-end linear chain oscillations

    Hi, (All oscillations I'll be talking about here are longitudinal.) For coupled oscillations of 2 masses between 3 identical springs (ends held fixed by walls), I think it was a standard textbook mechanics problem to show that the lowest-frequency mode is the symmetric one (where the masses...
  45. W

    Single Mode to Multi-mode back to Single Mode

    Alright. I'm having a little trouble getting started on this design of an interferometer. Essentially what I want is to couple a laser into the single mode fiber (SMF), which is fusion spliced to a multi-mode fiber (MMF). Assuming the fiber is unperturbed, the modes will not mix and you will no...
  46. H

    Vibration problem: mode shape?

    Hi all. I am taking a course in mechanical vibrations. I know that a mode shape is a pattern specific to a natural frequency of a system. That maens, the mode shape is determined under the context of free vibration, right? What kind of information can we obtained from the mode shape? Is the...
  47. D

    Opamp common mode rejection and virtual short

    I have a few questions concerning opamps. First what is the big deal about infinite common mode rejection? It seems to me by looking at the open-loop gain equation A(V2 – V1) = V0 it is obvious that when V2 = V1 the output is zero (common mode rejection). This may be where I am confused …...
  48. H

    Stability? nonlinear mode? soliton?

    Can someone explain to me what it means by nonlinear mode? I heard people saying that soliton is a nonlinear mode of the nonlinear schrondinger equation and therefore perturbed pulses tend to reshape to the soliton shape. In the reshaping proces, the energy dispersed is known as continuous...
  49. R

    Normal Mode Analysis+IR/Raman

    Dear friends, I need some help regarding running Gaussian 03. I have a complex molecule (64 atoms with 6 types of atom)...and finished geometry optimization successfully using method b3lyp with basis set pVDZ.. it took 4 days to complete this optimization procedure...Now i want to do frequency...
  50. R

    Normal Mode Analysis: Basics & Applications

    Hi Member, does anyone have some experience with normal mode analysis?I need to know from basics...i want to use this analysis for finding the vibrations of a complex molecule...(may be by using Urey- force constants,etc..or if u know any other method !). eagerly waiting Rajini
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