What is Multiple: Definition and 1000 Discussions

A multiple-unit train or simply multiple unit (MU) is a self-propelled train composed of one or more carriages joined together, which when coupled to another multiple unit can be controlled by a single driver, with multiple-unit train control.
Although multiple units consist of several carriages, single self-propelled carriages - also called railcars, rail motor coaches or railbuses - are in fact multiple-units when two or more of them are working connected through multiple-unit train control (regardless if passengers can walk between the units or not).
The term multiple unit does not denote locomotives using multiple-unit train control.

View More On Wikipedia.org
Recent contents Top users
  1. B

    How are multiple video outputs displayed on various sections of the TV screen?

    CRT televisions use electron guns to fire electrons at color phosphors on the screen which emit the light of varying frequencies to produce an image. They can scan row by row or column by column depending on the standard of the broadcasting signal though modern models have circuitry that can...
  2. azizlwl

    Answering Multiple Questions on One Topic: Vital Steps

    If we are to answer multiply questions on a single topic, do the step is vital. For example question#5, do we have to get answer for question 5(a) before we are able to do question b(b). Does it mean the first one is the easiest?Thank you.
  3. E

    Fortran Fortran OpenMP parallelization and writing in multiple files.

    Hello. I'm attempting to write some data in different files (each thread write in each file), but I'm getting an error saying: 'File already opened in another unit'. I'm using the function OMP_get_thread_num() from OpenMP library in order to open individual files in individual threads. !$OMP...
  4. T

    FTC integrate multiple functions.

    Homework Statement If F(x)=∫from 0 to g(x) of 1/(√(1+t^3)) dt and g(x)= ∫from 0 to cos(x) of 1+sin(t^2) dt, then find f'(pi/2) Homework Equations The Attempt at a Solution Tried FTC parts 1 and 2
  5. I

    MHB Kelly when splitting bet into multiple multis

    Hi, Please forgive any bad forum etiquette - I'm a newbie! I'm trying to figure out a staking system for when I group different bets together into multis, but I can't get one that makes mathematical sense to me. I'll illustrate an example. There are 4 bets to consider: A - Odds: 1.85, True...
  6. M

    Solving Magnetic Fields Produced by Multiple Charges in Free Space

    Why is there no equation for solving for the magnetic field produced by multiple charges in free space? To solve for this do you sum up all the magnetic fields produced by each of the point charges or what?
  7. F

    Assume that x is a positive multiple of 5 and is greater than 5.

    Homework Statement Assume that x is a positive multiple of 5 and is greater than 5. If 2x + 1 < 100, how many values for x are possible? Homework Equations The Attempt at a Solution How I solved the problem First manipulated inequality: 2x+1<100 => 2x < 99 => x <...
  8. F

    Linear approximation and Multiple integral questions

    I am aware that for a function of two variables f(x,y) a linear approximation of a point f(x,y) close to f(x_0,y_0) can be approximated by the tangent plane approximation f(x_0+\Delta x,y_0+\Delta y)\approx f(x_0,y_0)+f_x(x_0,y_0)\Delta x+f_y(x_0,y_0)\Delta y where \Delta x=x-x_0 and \Delta...
  9. B

    Connecting Multiple AC Alternators to run house electricity

    Closed
  10. L

    Wave Function Collapse: Observers & Probability in Schrodinger's Cat Experiment

    In wave function collapse the observer forces one of many states to occur such as Schrodinger's cat experiment but what if you have the experiment done in a the middle of a stadium would all observers collapse the waveform the same way? If the answer is yes then I assume that the individual...
  11. R

    Theoretical top speed using multiple gravity assist

    Basicaly wanting to know the maximum velocity achievable if we sent out a craft purely to go as fast as poss using gravity assist + initial escape burn. Obviously a time limit would be needed so let's say 10years of gravity assist manouveres. How fast could we go? Would the gforces involved...
  12. A

    MHB Finding volumes by multiple integrals

    How do I solve this? How do I determine the range? Ill they be triple integrals?Please explain to me. Find the volumes in R3. 1. Find the volume U that is bounded by the cylinder surface x^2+y^2=1 and the plane surfaces z=2, x+z=1. 2. Find the volume W that is bounded by the cylindrical...
  13. A

    Multiple integrals for finding volume

    How do I solve this? How do I determine the range? Ill they be triple integrals?Please explain to me. Find the volumes in R3. 1. Find the volume U that is bounded by the cylinder surface x^2+y^2=1 and the plane surfaces z=2, x+z=1. 2. Find the volume W that is bounded by the cylindrical...
  14. A

    The Multiple Worlds theory- it contradicts itself

    I'm new here. So, I might be unfamiliar with many things that have been talked about here. However, I noticed something about the Multiple Worlds theory-the fact that it contradicts itself. In the following paras, I'm going to express myself about this. If I'm not wrong, the theory claims the...
  15. J

    Multiple lenses systems - specific scenarios

    Homework Statement Hi all... this isn't really a homework question, but more a question to reinforce the concept of multiple lenses. Firstly, it makes sense that the image location of an object would be behind a 2-convergent lenses system, provided they are sufficiently spaced apart...
  16. N

    Capacitance - How handle multiple caps in series and parallel?

    Capacitance -- How handle multiple caps in series and parallel? I can't draw the circut for the cuestion so I attached it. I am having trouble finding the charge across capacitor 2. I don't understand what to do with the 3 capactiors right in that group and how to figure the change in voltage
  17. M

    Sideband Power for a multiple tone wave

    Homework Statement I need to find the sideband power in a AM DSB. My book doesn't have an example or explain what to do when you have a modulating signal that has two tones (two cosines). Homework Equations Ps=sideband power= 0.5*(mean square value)^2 Carrier signal = A*cos(Wc*t)...
  18. U

    Chain rule with multiple variables

    I was reading over a textbook that stated the following, where y(s,t) = v(x(s,t),t) \frac{\partial y}{\partial t} = \frac{\partial v}{\partial x}\frac{\partial x}{\partial t} + \frac{\partial v}{\partial t} and \frac{\partial^2y}{\partial t^2} = \frac{\partial^2 v}{\partial x^2}\left (...
  19. U

    Testing a drug's effect on survival across multiple distinct studies

    I have survival and other data for between ~1000 patients from different studies with indications varying from organ transplantation to cancer. Patients within this cohort will have been drawn from many different studies in which the objective - long-term graft survival, overall survival rate...
  20. A

    Multiple Sclerosis Home Health Care

    I don't know if this post is in the correct location but I have a very serious question. I need information from anyone with experience in acquiring home health care to MS patients with dementia or other severely disabled family members. Basically, the person in my family has such an advanced...
  21. L

    Elastic collisions between multiple bodies

    When considering the case of two or more point masses colliding in a 2 dimensional plane, is there any way to determine the final state completely from the initial conditions? if not is it not a blow to the deterministic ways of classical physics...
  22. C

    MHB What Is the Correct Method to Find the LCM of 12 and 56?

    I did actually think I had this off to a T sort of speak, but seems I have run into a problem and am now unsure? Find the LCM of 12 and 56. This is how I do them but if incorrect I would appreciate the correct notation being pointed out to me;) 12/2 = 6 My prime factors of 12 are therefore 2...
  23. K

    How to correctly average over multiple data sets

    Homework Statement In a particular Magneto-Optic Kerr Effect (MOKE) experiment I have taken data for 20 hysteresis loops in which Kerr Voltage is measured as a function of Applied Field. I wish to obtain an average curve. The problem is this; Even though the settings for each loop were...
  24. S

    Analyzing a 7-variable data set where multiple variables changed at once

    Hi, I have some experimental data from a colleague which has been collected with different values for 7 parameters. It isn't nice, as in it's not as if 6 of the parameters were held fixed while the seventh was adjusted. Beyond that, I don't have much data. I'm not up on my statistical...
  25. coktail

    Multiple collections of energy, very far apart

    Is it possible that the big bang, and all the energy we know of in the universe, is just one big collection of energy of many? Is it possible that big bangs are happening all the time, but just so vastly far apart that we could never detect them? This seems to get into the "Could anything...
  26. H

    Critical points with multiple variables

    Homework Statement Locate and classify the critical points of f(x,y) = (x-y)(xy-1). Homework Equations The Attempt at a Solution I found the partial derivatives with respect to x and y and I got: ∂f/∂x = -y2+2xy-1 ∂f/∂y = x2-2xy+1 After setting them both equal to zero I can't...
  27. L

    Highest Common Factor and Lowest Common Multiple

    Highest Common Factor and Lowest Common Multiple of 4 , 6 , 8 , 18 HCF 4 = 2.2 6 = 4.2 8 = 4.2 18 = 2.9 HCF = 2 ? LCM 4 = 8 , 12 , 16 , 20 , 24 , 28 , 32 ... 72 6 = 12 , 24 , 32 , ... 72 8 = 16 , 24 , 32 ... 72 18 = 36 , 54 , 72 LCM = 72 ??
  28. L

    Couple multiple choice: Confirmation needed

    1. For which following condition, will the cross product of two vectors be zero? a. If the angle between them is 90°. b. If the angle between them is 0°. c. If the angle between them is 45°. d. If the vectors have the same magnitude. 2. If a = (5, 2) and b = (-3, 1), then which of the...
  29. J

    Prove a^n - a is multiple of n

    Homework Statement Prove that a^3 - a is a multiple of 3 a^5 - a is a multiple of 5 Generalise … to a^n - a a multiple of n Homework Equations The Attempt at a Solution a^3 - a = a(a^2 - 1) = a(a+1)(a-1) thus three consecutive numbers are multiplied. if three numbers are...
  30. C

    Using multiple 555 timers in astable

    Hello, I am relatively new to this forum as a registered member but have been reading as an unregistered guest for quite some time. I have searched and searched through search engines and forums and am really not having too much luck finding any information on using several 555 timers in an...
  31. R

    Converting cartesian to polar coordinates in multiple integrals

    Homework Statement Do you see how y gets converted to csc? I don't get that. I would y would be converted to sin in polar coordinates.
  32. R

    Multiple integrals in polar form

    Homework Statement do you see how the integral of r is .5? I don't get how that follows?
  33. R

    Solving Multiple Integrals - Understanding Triangle Area Calculation

    Homework Statement The Attempt at a Solution I understand the steps, although it took quite a while, but what I don't understand is that a triangle with base 2 and height 2, it's area is 2. With two triangles of that size the area should be 4. The books says the area is 8.
  34. A

    Multiple e-mails at once in gmail

    I need to send out a whole bunch of the same e-mails to different people and I know I can use CC or BCC, but I want to address them by their name as well. Is there a way to do that in Gmail?
  35. M

    Using multiple variables to generate a table or csv

    Hi All, I am new to mathematica and this kind of work in general, and was looking to score a little help on this thread. I basically need to build a data set that contains city information, country information, coordinates, and weather information. I want to do this using Mathematica's...
  36. R

    Multiple inductor or capacitor RLC circuits

    So I know that the equation for the natural frequency of an RLC circuit is: ω0=(LC)-1/2 I'm just wondering how this would change for a circuit with more than one inductor or capacitor. Say for instance an inductor in parallel with a capacitor, both connected in series to another inductor...
  37. R

    Formula for determining if one vector is a multiple for two others

    Homework Statement The Attempt at a Solution Is there a formula for determining x = 3v1 - 2v2 It looks like you just have to do trial and error. I tried Gaussian Elimination on the two vectors and got -1.5 and .5 so that didn't work.
  38. A

    MATLAB Using multiple functions in matlab Errors

    Dear All, Please I need your assistance in solving this MATLAB problem. I will be glad to hear from you as early as possible. Thanks for your anticipated help I have three functions First one function f_PR_W=Newtonphasemolefraction1(W_PR, z,C,K_PR ) f_PR=0; for c=1:C...
  39. A

    MATLAB Errors in using multiple functions in matlab

    Hi, Please I need your assistance in solving this MATLAB problem. Thanks for your anticipated help I have three functions First one function f_PR_W=Newtonphasemolefraction1(W_PR, z,C,K_PR ) f_PR=0; for c=1:C f_PR_W=f_PR+z(c).*(1-K_PR(c))./(1+W_PR.*(K_PR(c)-1)); end...
  40. T

    Circular Motion Problem: Multiple Masses

    Homework Statement Three masses are connected by strings and swung in a verticle circle. You are holding string 1 which is attached to a mass attached to string 2 likewise attached to another mass string 3. Which string has the greatest tension? Which string has the smallest tension?Homework...
  41. K

    Programs Is it Worth Pursuing Multiple Concurrent Degrees?

    Hi, I've lurked around this forum for a while but I wasn't able to find a great answer to this question. If you know of a thread regarding this on this or another forum, please refer me to it! My question in short (in case you don't want to read this entire lengthy post): If I have...
  42. E

    Multiple submission to journal and conference

    can i submit same research work (multiple submission) in two different journal and conference? after getting the final result i will keep the work either in the journal or in the conference. i have submitted the work to a journal and the review result will take a long time. in the...
  43. Y

    Simple multiple choice questions

    I'm taking a final tomorrow and was just wondering if someone could confirm that these (most missed) multiple choice questions on the previous exams are answered correctly. Again, this isn't homework, they are old test questions The "Principle of Equivalence" states that __________ and...
  44. A

    Queuing Theory with multiple class of traffics

    I am trying to use Queuing Theory to do some computer architecture studies . Is there any mathematical treatment of Queuing Theory in which there is single queue but multiple classes of traffic along with multiple servers such that for every class of traffic there is one dedicated server...
  45. S

    Multiple quantum entanglements

    Lets say you have a particle A, which then physically interacts with particle C and B to become entangled. Since A is entangled with B, and C is entangled with A, then it would follow that c is entangled to B. I guess my main question is it possible to have multiple systems entangled with each...
  46. Y

    Flexibility - multiple methods for solutions?

    Flexibility -- multiple methods for solutions? I found that for some mathematical equations, for example quadratic equations or other equations where f(x)=0, the solutions for f(x)=0 could be 2 i we solve certain way and only 1 out of 2 if we use another method, somethings like changing the...
  47. F

    Finding relative velocity when there are multiple unknowns

    Homework Statement Two spaceships, each measuring 300 m in its own rest frame, pass by each other traveling in opposite directions. Instruments on board spaceship A determine that the front of spaceship A requires 1 microsecond to traverse the full length of B. What is the relative velocity...
  48. M

    Matlab - multiple integral Riemann sums

    1. Homework Statement Write an m.file that will integrate a function f(x, y) on any given rectangle (a,b)\times(c,d) and returns the value of the integral from a to b and c to d of the function f(x,y) . Include error-catching code in the case that the integral diverges. The program...
  49. O

    Does Having Multiple Degrees Benefit or Hurt Engineers in the Industry?

    My dilemna is not lack of knowing what I want to do, it's knowing too much that I want to do. I'm very passionate about both Electronic Engineering, and Computer Science. I'm intending to apply for both at different universities (because I'd love to study either of them, and what I've applied...
  50. C

    A kirchoff's law question with multiple batteries

    Homework Statement To find the voltage at the 5 ohms resistor. Homework Equations V=IR Kirchoff's first and second law The Attempt at a Solution The attempt was simply too long I ended up with a voltage of 6.5V on the 5 ohm resistor... Please help me, I have been stuck in this...
Back
Top