What is Diagrams: Definition and 689 Discussions

A diagram is a symbolic representation of information using visualization techniques. Diagrams have been used since ancient times on walls of caves, but became more prevalent during the Enlightenment. Sometimes, the technique uses a three-dimensional visualization which is then projected onto a two-dimensional surface. The word graph is sometimes used as a synonym for diagram.

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  1. H

    Drawing Feynman Diagrams with Feynmf

    Hi everybody, I am a MAC OS X user, and I have a trouble with feynmf package in latex. I have downloaded the package from CTAN website and followed the instructions for installation. Then in my latex file I coded a generic 2-body scattering process labeled as "generic", after typesetting...
  2. H

    Visualizing Relationships with Venn Diagrams and Sets S, A, B, C

    Given S is set for all real number. A is set for all even number, B is set for all positive integer, C is set for odd number represent the relationship between the sets with Venn diagram. This question is seems easy. However, there is a problem that how can we illustrate the three sets in...
  3. I

    Understanding Feynman Diagrams: A Beginner's Guide

    Homework Statement i've never had a QM class let alone QFT, I've only even had intro physics 1 & 2, but I've been given a problem that is very similar to this: -ie^3 \int {d^4 q \over (2\pi)^4} \gamma^\mu {i (\gamma^\alpha (r-q)_\alpha + m) \over (r-q)^2 - m^2 + i \epsilon} \gamma^\rho {i...
  4. U

    Free body diagrams with tension

    My question is for free body diagrams with tension on top and mass hanging from the bottom. Why is it "T-mg" sometimes and "mg-t" other times. How do I know which one to use? I was doing gravitation questions where "T-mg=Fc" sometimes and "mg-t=Fc" other times.
  5. J

    Understanding Spacetime Diagrams: Event E & Coordinates in K & K

    Hi I have some very basic doubts on spacetime diagrams. Please refer the figure attached. Here in this spacetime figure an event E is shown as observed from K and K'. K' moves with v with respect to K. The axis CT is tilted angle alpha following vt, so that any event that occurs at x' = 0...
  6. P

    Feynmann diagrams, bhabha scattering

    There is nowone who can help me on the homework forum, so i'll try it here...
  7. A

    Dispersion relation diagrams, phonons

    In dispersion relation diagrams, where omega is plotted against k, omega is sometimes nonzero at k=0. How is this possible? I thought a wave had to have a nonzero wavenumber :confused:
  8. B

    Donor and acceptor levels in band diagrams

    1.in band diagrams, books usually show parabolic bands for the conduction band and the valence band. They will also make note of the acceptor and donor leves in the band gap. However, they always draw straight horizontal lines for these levels. Is that correct? The impurity levels are...
  9. A

    "Finding theta in Argand Diagrams

    Homework Statement If w=costheta + i sintheta and theta is between -pi and pi: Find theta if E O and A are on the same straight line. E is a point on diagram representing w(z3). Homework Equations The Attempt at a Solution Ive found the following: z1 (1+(sqrt3)i) z2...
  10. C

    Chem 2, Cell diagrams for oxidation/reduction reactions

    Homework Statement All I'm trying to do is translate the cell diagram below into a into a an equation so I can determine which is the anode and which is the cathode. Here is the cell diagram. I know how to balance it, I just want to make sure I'm putting reactants and products on their...
  11. M

    Transportation engineers: help on windrose & mass diagrams and pavement

    General Questions: How do you show Free-Haul Distance, Limit of Economic Haul, and Volumes of Waste and Borrow on a mass diagram? I don't have one in particular to ask because I'm pretty much lost in general with this topic. Windrose: Another general question, how do you determine which...
  12. S

    What prgram you could use to draw a ponchon and mccabe diagrams?

    Hey does anyone know what prgram you could use to draw a ponchon and mccabe diagram for mass transfer. Particularly one that's downloadable :P. Cheers.
  13. N

    Drawing Feynman diagrams with Feynmf

    I have posted a question on the Tutorial subforum because there was already a thread on that subject but I figured that people here may be more likely to be able to help me out https://www.physicsforums.com/showthread.php?p=1313121#post1313121 Thanks! Patrick
  14. L

    Verify Your Lewis Dot Diagrams: Get Expert Feedback and Improve

    Hi, I am not too sure about my lewis dot diagrams, can someone check them and let me know if anything is wrong with them, thanks.
  15. R

    Software for constructing simple circuit diagrams

    does anyone know of any software i could use to construct simple circuit diagrams? (such as series and parallel circuits containing bulbs, resistors, thermistors, voltmeters, ammeters...) i teach physics 11-18 and it'd really help with lesson planning, thanks in advance
  16. D

    Program needed - for drawing electronic circuit diagrams

    I am in an electronic circuits laboratory class, and I am looking for a free, easy to use program that will allow me to construct circuit diagrams for my reports. Any ideas? Thx!
  17. P

    Labeling Intersection in Venn Diagrams

    just a clarification cause it's been so long if you have intersection in a venn diagram, is it general practice to label the section including the intersecting diagrams. say you have two sets of 10 with 5 things in the intersect. do you label it 10 in the 2 sets and 5 in the intersect. or. 5...
  18. S

    Shear force diagrams simple stuff hey?

    shear force diagrams simple stuff hey!? hey guys this is probably very straight forward stuff for u but i have an example question on a loaded beam. there is a UDL, 2 pure couples and 2 fixed points. now how do i do the shear force and bendin moment diagram for this really lookin forward...
  19. V

    Drawing free body diagrams for pendulum

    Homework Statement I have to do this for a lab. Draw and label the free body diaggram of a pendulum when it is at its maximum amplitude of 30 degrees. The magnitudes of the vectors must be correctly scaled and the directions correct. Homework Equations The Attempt at a Solution...
  20. S

    Why is aligning the vacuum level necessary in band diagram creation?

    Why is it that we align the vacuume level (when drawing the band diagram) first before we put two pieces of semiconductor together? (My book talks about how the energy of the two free electrons should be the same when each of them jumps out of its respective material...but it is not entrirely...
  21. marcus

    Baratin-Freidel: Hidden Quantum Gravity in 4d Feynman diagrams

    http://arxiv.org/abs/hep-th/0611042 Hidden Quantum Gravity in 4d Feynman diagrams: Emergence of spin foams Aristide Baratin, Laurent Freidel 28 pages, 7 figures "We show how Feynman amplitudes of standard QFT on flat and homogeneous space can naturally be recast as the evaluation of...
  22. P

    Thermodynamics - How do I create energy level diagrams

    Are there any tutorials available that explain how to create an energy level diagram for related reactions? I've done a search on google but came up with nothing. Thanks.
  23. B

    Check my static equilibrium diagrams

    Hi physics fans, I've made four diagrams for inclusion in a physics lab report. They depict situations in which a meter stick is in static equilibrium (no net torque, no net force). My professor mentioned to me that my analysis of the forces on the stick is not correct, but was not more...
  24. C

    Do Force Diagrams Show Forces Exerted by the Object?

    Hi, I have had a slight confusion on the Force and Free-Body Diagrams. I know that they are represented by arrows for the vectors in the direction of the force and that forces exerted on the object are shown. Are the forces exerted by the object also shown for the Force and Free-Body Diagrams...
  25. S

    Solving Motion Graphs: Answers to A & C Questions

    I keep getting the wrong answers on a few problems I am working on. Could anybody tell me how do get the answers from these motion graphs please? Thank you! (They are attached) The question is as follows for motion_diagram1.jpg The figure below shows 3 motion diagrams A, B, and C. The time...
  26. T

    Bending moment and shear force diagrams

    http://www.sendspace.com/file/czhuhx http://www.sendspace.com/file/gviky7 pls have and look at the link above and kindly tell me how to draw the bending moment and shear force diagrams.this is in the chapter of statics mechanics thanx
  27. B

    Chemistry Molecular Orbital Diagrams

    In a molecular orbital diagram that shows the bonding of two electrons (like a diatomic molecule), there are sigma and pi bonds, and the sigma and pi antibonds. Here is an example: http://www.westga.edu/~chem/courses/chem410/410_09/sld024.htm I don't understand how to determine where to put...
  28. E

    I Need Circuit Diagrams For Active Band Stop Filters Please. Can Anyboby Help Me

    I Have A Project To Design And Construct An Active Band Stop Filters I Need Circuit Design Please Thanks
  29. B

    Where Can I Find Complex Electric Circuit Diagrams for High School Students?

    Hi everyone I have a hard time finding complex electrical circuits that high school students solve ...i.e. current, voltage and resistance within the circuit itself. If anyone can kindly find some of these complex electrical circuits to solve over the internet that can be any type series...
  30. P

    Draw Simple Feynman Diagrams w/ Latex, Feynmf & TeXnicCentre

    Could anyone direct me to a coherent tutorial for drawing simple Feynman diagrams in Latex (I use TeXnicCentre) using the Feynmf package? The only ones I've found are rather complicated, given that I don't have a huge deal of experience with the writing of lengthy 'tex. Cheers, guys. [If this...
  31. V

    Understanding J-K Flip Flops and Timing Diagrams

    I'm trying to understand how the J-K flip flop works and how to draw the timing diagrams. I was reading about it on wikipedia and was wondering if someone could explain this to me: "Specifically, the combination J = 1, K = 0 is a command to set the flip-flop; the combination J = 0, K = 1 is a...
  32. S

    Struggling to understand Lie Algebra: Constructing Weight Diagrams

    Hi, I have spent all weekend reading Textbooks, where I concentrated on Cahn, trying to understand what is going on in Lie Algebra lecture notes. I am having a lot of trouble because I have no background in maths other than applied maths, and lie algebras is so different to applied maths and I...
  33. M

    Moments and free body diagrams help

    Hello all, Since I have run into the problem of regularly leaving moments out of my free body diagrams (and vice versa), I thought I'd pose a question on the topic. In trying to wrap my head around the concept, I've gone back to the beginning of the semester's notes and that didn't really...
  34. marcus

    Long-awaited Freidel Baratin (QG related to Feynman diagrams)

    http://arxiv.org/abs/gr-qc/0604016 Hidden Quantum Gravity in 3d Feynman diagrams Aristide Baratin, Laurent Freidel 35 pages, 4 figures "In this work we show that 3d Feynman amplitudes of standard QFT in flat and homogeneous space can be naturally expressed as expectation values of a specific...
  35. P

    Free Body Diagrams: All Forces Acting on Cart & Mass

    would this be all the forces acting on this cart and on the mass (minus friction of course)
  36. T

    Creating Timing Diagrams for Circuits

    does anybody knows any website that i can get information on how to draw timing diagrams for sequential or normal circuits?? pls help as i have ran out of idea...thanx
  37. C

    Draw Circuit Diagram: 2 Dry Cells & 2 Light Bulbs in Parallel

    Q: Use symbols to draw a circuit diagram showing two dry cells connected in parallel with each other, and in parallel with two light bulbs. Show a voltmeter connected to measure the electrical potential of the two dry cells and an ammeter to measure electrical current through one of the bulbs...
  38. Gamma

    Software to create physics diagrams

    Hi, Does anyone know of any freeware available in the internet for creating diagrams for physics classes. I need to be able to draw clearly labeled diagrams for all kinds of problems that we encounter in physics. I found one at [PLAIN]www.sherifsoftware.com[/URL] called Drawplus4. Has...
  39. S

    Drawing Feynman Diagrams: Tools & Photoshop

    Hello, I'm looking for a program to draw Feynman diagrams, are there any useful tools, or do you draw them in Photoshop?
  40. V

    Checking 3 D Flip-Flops for Timing Diagrams

    Can someone please check to see if I drew teh circuit right? It's supposed to be 3 D flip-flops wired together such that D1 = Q3, etc. on the bottom. And how would I go about drawing the timing diagrams for the outputs if all of them start in the set state. I get really confused about timng...
  41. B

    Spacetime Diagram of Binary Star System - Get Visuals & Info

    Hi. Does anyone know what the spacetime diagram of a binary star system would look like? thanks pic would be great blumfeld0
  42. M

    Rigid Bodies and Free Body Diagrams (w pulley)

    Question: "A block of mass m1 = 1.87 kg and a block of mass m2 = 5.84 kg are connected by a massless string over a pulley in the shape of a solid disk having radius R = 0.180m and mass M = 12.7 kg. These blocks are allowed to move on a fixed block-wedge of angle 31.4 degrees as in the figure...
  43. Mk

    Orbital Diagrams and Electron Configuration Notations

    I used to understand this -- a few years ago -- but it has completely slipped my mind. What is going on with al this 1s2 and Like Cs[Xe]6s1? Thanks a lot, Mk
  44. S

    How can I determine where the wires in a circuit diagram connect?

    urgent help needed http://www.physik3.gwdg.de/~rgeisle/nld/sbsl-howto.html Halway down that page is a circuit diagram. In the diagram wires don't lead to anywere(after the resister label R1 the wire doesn't go anywere), I don't that much about reading circuit diagrams but I know those wires...
  45. S

    Learning About Air Coupling in Shafts - Diagrams Welcome!

    I am trying to learn more about air coupling. That is the coupling between 2 shafts I am having a hard time finding any information on the subject matter does anyone know how these systems work and have any diagrams? thanks
  46. K

    How Does the Electron Dot Diagram for CN Look?

    how would the electron dot diargram for CN look? i am tired and stumped.
  47. M

    E-K Diagrams, valence band, conduction band

    I'm having difficulty figuring out how to work this problem: Assume a material has a given E-K diagram: E(K)conduction = Ec + E1 * sin^2 (Ka) E(K)valence = Ev - E2 * sin^2 (Ka) a=0.5nm E1 = 5eV E2 = 4eV I have to: * sketch the E-K diagram for the first brillouin zone (-pi/a < k <...
  48. H

    Vacuum fluctuations of a free field and closed diagrams

    I am confused with the Scharnhorst and Casimir effects. The confusion started here. As it seams that there is no response to my questions in post #9, I will try here. I stated there my understanding about perturbation theory which leads to Feynman diagrams: The amplitudes for the fluctuations...
  49. A

    Can Anyone Help Identify the Formulas for These Steam Engine Diagrams?

    Need some help. I studied math a million years ago and my boss thinks I still remember anything about diff EQ besides my professor's haircut. I don't. I have these diagrams (http://www.dubberly.com/stage/Maxwell2.jpg and attached). I need to label them with appropriate formulas. I have a...
  50. R

    LaTeX Feynman diagrams in threads or latex

    Hey, I was wandering if anyone knew if the Feynman diagrams could be created in Latex or in threads like this? If not then maybe it would be an interesting development avenue...
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