What is Maxwell: Definition and 499 Discussions

Ghislaine Noelle Marion Maxwell ( ghee-LAYN, -⁠LEN; born 25 December 1961) is a British socialite known for her association with financier and convicted sex offender Jeffrey Epstein. She worked for her father, the publishing tycoon Robert Maxwell, until his death in 1991, when she moved to the United States and became a close associate of Epstein. Maxwell founded a non-profit group for the protection of oceans, The TerraMar Project, in 2012. The organisation announced cessation of operations on 12 July 2019, a week after the sex trafficking charges brought by New York federal prosecutors against Epstein became public.In 2020, Maxwell was charged by the US federal government with the crimes of enticement of minors and sex trafficking of underage girls. The US Virgin Islands Department of Justice announced on 10 July 2020 that Maxwell was also under investigation in the Caribbean territory.

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  1. S

    More ebooks about Maxwell relations of Thermodynamics

    I'm learning about Maxwell relations of Thermodynamics, but it's difficult for me to find more books about this in Vietnamese. So, I want to ask you about some english ebook about this. Thanks a lot!
  2. wololo

    [itex](\frac{\partial U}{\partial P})_T[/itex] derivation

    Homework Statement Homework Equations Maxwell relations The Attempt at a Solution Here is how I proceeded. Am I allowed to go from line 1 to 2? It almost seems too simple. dU=TdS-PdV \\ (\frac{\partial U}{\partial P})_T=T(\frac{\partial S}{\partial P})_T-P(\frac{\partial V}{\partial P})_T...
  3. AwesomeTrains

    Question about the derivation of the energy momentum tensor

    Hey I'm trying to follow the derivation given here: http://lampx.tugraz.at/~hadley/ss1/studentpresentations/Bloch08.pdf Homework Statement As it says in the pdf: "Based on Noether's theorem construct the energy-momentum tensor for classical electromagnetism from the above Lagrangian. L=-1/4...
  4. wololo

    What is the solution for finding F in terms of T and V without integrating?

    Homework Statement Homework Equations Maxwell relations The Attempt at a Solution I have an attempt at a solution, but I am not sure if I can replace the integral of dT in the helmholtz equation by the T I found using the internal energy. Does this make sense? Thanks
  5. V

    Maxwell distribution of relative velocities

    I want to calculate the distribution function for the relative velocity v_r = v_1 - v_2 of two particles. Each particle velocity follows the Maxwell distribution for velocities. They have the same mass and temperature. Can I just multiplicate the Maxwell distributions of the two particles (and...
  6. T

    Layman explanation of some simple EM equations

    So its been a while since I studied maxwells equations, anyway: So From my ignorant perspective, trying to derive conceptual meaning from these, I can see that the time dependant study there is some conductivity x the partial differential of the magnetic vector potential plus the cross product...
  7. G

    Problems solvable by thermodynamics of information

    Hello, I need to work on the thermodynamics theory of information, but I can't find real applications aside from the resolution of the maxwell's demon and the szilard engine. I would need more applications... Any idea?
  8. G

    Are plane waves real/physical?

    When finding solutions to Maxwells equations we always cosider the case of a plane wave. But are plane waves real/physical solutions we can consider in real life? My guess is not because it is required to propagate infinitely. So why do we use plane waves to solve Maxwell's equations?
  9. G

    What is this version of the wave equation?

    I came across this expression for the wave equation: \nabla^2E + \mu\sigma\frac{\partial{E}}{\partial{t}} - \frac{n^2}{c^2}\frac{\partial{E}}{\partial{t^2}} = 0 My question is what kind of medium is it for/where did it come from?
  10. ToonBlue

    Learning Physics - Engineering Electromagnetics - Maxwell

    Does anyone know any good lecture material online that I can learn this concept on Maxwell? It would be good if there is a video webcast on this concept. I am having some problem understanding this chapter.
  11. M

    Using Simplorer and exporting to ANSYS Maxwell

    Hi everybody Actually I drew my external circuit at simplorer 11 but now don't know how to export external circuit from simplorer 11 to ansys maxwell 16,please help me. thanks
  12. Luminescent

    Who Derived the Value of Magnetic Permeability in a Classical Vacuum?

    Who is credited for deriving the value of magnetic permeabilty in a classical vacuum? How would one go about sourcing information in relation to such a value?
  13. mr.93

    Maxwell 2d (ANSYS): Bldc motor simulation

    Hi all I have few questions in bldc motor simulation in maxwell 2d: - I need help in loss calculation,I exported a bldc motor in rmxprt to maxwell 2d after entering core properties and w/kg data in 50hz,in 2d checked stator and rotor in set core loss and checked (consider core loss effect on...
  14. M

    Maxwell fourth equation incorrect?

    Hi all this question seems to be silly but i want to where i am wrong. Maxwell was made modification in Amperes law curl H=J and he added new quantity displacement current Jd, reason was that Div.J=0 (true in DC current but not in AC charging capacitor). but if i say Div J=0 in capacitor...
  15. K

    Ansys Maxwell: Set solution context error

    I have to created a Current Transformer by Ansys Maxwell 15. I set Boundaries, Excitations, Mesh Operations, and Analysis correctly. Finally, I select the menu item View > Set Solution Context, the Set View Context is appeared, and I want set Time to "0s" but it shows only "-1". I don't...
  16. densaface

    Why is the Lorentz force calculated in Ansys Maxwell so low?

    Why is the Lorentz force calculated in Ansys so low? According to the formula F=B*I*l, it is supposed to be at least 1000 times higher. The model is really simple: a magnetically conductive plate in a static magnetic field inducts the magnetic field from the surrounding space, which makes its...
  17. Z

    Why Maxwell and Kelvin-Voigt model fail to represent a solid

    Hi I m studying modelling the viscoelastic passive properties of vascular walls and there is question! Why does Maxwell andKelvin-Voigt fail to represent a solid? and also what steps are required from a numerical point of implementation point of view , are required to turn an elastic model...
  18. A

    Why is μ0 assigned an exact value in SI units?

    Hello all, While I understand the significance of natural units, I am wondering why, in SI units, we are able to assign μ0 an exact value. The speed of light is experimentally determined in m/s, and given the relationship derived from Maxwell's equations, we know that c^2 = 1/√(ε0μ0). Thus by...
  19. V

    Ansoft Maxwell - Multi terminal excitation on 3D Transient

    Hello everybody,I am busy with a magnetic transient 3D model and quite new in the use of Maxwell. I am simulating a 6 pulse rectifier in double star connection (connection number 5 as per IEC 146-1-1). Each of the 6 arms of rectifier foresee 8 paralleled diodes. I am interested to see the...
  20. C

    Maxwell equation at the surface of a conductor - paradox?

    Assume that we have a conductor of any shape, say a ball of copper. At electrostatic equilibrium, it is well known that the potential inside this conductor is constant, for otherwise free charges would move from points of highest potential to points of lowest potential (this includes the surface...
  21. H

    Exporting Pictures from Maxwell: Solutions & Tips

    hi everyone. I need to take a high quality picture of my design and its graphically results in maxwell but i couldn't find a proper solution. I would be really grateful if somebody help me.
  22. P

    Design 1.5 A Solenoid & Charge 1.5 V Battery

    Hey All, I'm trying to design a solenoid that would generate about minimum 1.6 A of current in order for me to charge up a 1.5 A 1.5 V battery. I already designed one which is about 10CM in length and unknown number of turns (as I used a drill to wind the coils around it. so I would guess its...
  23. Strangelet

    Problem with Maxwell Lagrangian Density

    Homework Statement I have to expand the following term: $$\dfrac{1}{4} F_{\mu\nu}F^{\mu\nu} = \dfrac{1}{4} \left(\partial_{\mu}A_{\nu} - \partial_{\nu}A_{\mu}\right) \left(\partial^{\mu}A^{\nu} - \partial^{\nu}A^{\mu}\right)$$ to get in the end this form...
  24. L

    Thermodynamics - Maxwell Relations

    Homework Statement 2. The attempt at a solution I've tried using the relation Cp = T(dS/dT), isolating "T" for T = Cv2(dT/dS) and using the maxwell relations to reduce the derivatives, reaching, T = Cv2/D (dV/dS), but i don't think this is the right way to do solve this problem, i couldn't...
  25. S

    Integral form of Maxwell equations.

    I have been studying the Maxwell equations recently (namely the integral forms of them). Of course I had to study line integrals before that. Well, I went to a hyperphysics page to look up the equations: http://hyperphysics.phy-astr.gsu.edu/hbase/electric/maxeq.html I noticed that the...
  26. Kolton

    Solving Magnetic Field Problems w/ Ansoft Maxwell 14.0?

    So I'm trying to run some 3D transient simulations based on magnetic field focusing/shielding, but I'm not getting the expected results. Does anyone know if Ansoft Maxwell 14.0 will solve for the magnetic fields created due to the eddy currents? It doesn't appear to.
  27. Q

    Maxwell Distribution of speeds

    Homework Statement A gas consisting of 15,200 molecules, each of mass 2.00 x 10-26 kg, has the following distribution of speeds, which crudely mimics the Maxwell distribution: Number of Molecules - Speed (m/s) 1600 - 220 4100 - 440...
  28. R

    Transient FEM Simulation of a Solenoid Actuator with MAXWELL

    Hey Guys! Hi Guys! Well I am new here and I have to confess that I somehow got stuck in a 3D transient electromagnetic simulation of a solenoid actuator and… I’m a mechanical engineer^^ So I would appreciate some help of you guys! 1. I imported the geometry from CAD-files. But I remodeled...
  29. C

    Why does corrected Maxwell Boltzmann have decimals?

    So I have just been reading up on statistical thermodynamics and have no idea why the bose-einstein, fermi dirac and maxwell boltzman are all integers, that makes sense, but then when you make the degenerate correction to the maxwell Boltzmann by dividing by N! we get decimal answers. Why is...
  30. J

    Ansoft Maxwell - Transient solver

    Hello everybody i am trying to simulate some high air gap transformer. While Magnetostatic solution works fine , transient seems not to. Actually i connect the first winding to a 90KHz voltage source and then in series with a capacitor. The second winding in series with a Capacitor and a...
  31. fluidistic

    Maxwell stress tensor to calculate force (EM)

    Homework Statement A sphere with dielectric constant ##\varepsilon## and radius R is placed inside a homogenous external electric field ##\vec E_0##. The sphere is divided in 2 hemispheres such that their common interface is orthogonal to the external field. Using the energy-momentum tensor...
  32. E

    Torque Analysis for Electromagnetic Retarder on MAXWELL 3D

    Hello everyone! I have a thesis about electromagnetic retarders. I need to do torque analysis for retarder; but I don't know how to do it on Maxwell 3D. I've tried Eddy Current solition; but analysis results didn't comply to electromagnetic retarder's torque charasteristic. Could anyone help me...
  33. K

    2D Maxwell complex coordinate stretching PML

    Hello, I'm trying to derive the perfectly matched layer for the TM mode Maxwell's equations using a complex coordinate stretching. As seen in http://math.mit.edu/~stevenj/18.369/pml.pdf . But I'm running in a bit of trouble somehow. \partial_t H_x =-\mu^{-1} \partial_y E_z\\ \partial_t H_y...
  34. D

    PC Characteristics: Simulation FEM professional purpose

    Dear all, I'm an electric engineer, and I usually work with software as Ansoft Maxwell, Matlab, Ansys, COMSOL... I need a PC for serious professional simulation, and I would like if someone can give me some tips of the characteristics I should ask for this purpose. I don't want to spend more...
  35. R

    Calculating Force using the Maxwell Stress Tensor

    Homework Statement Calculate the force of magnetic attraction between the northern and southern hemispheres of a uniformly charged spinning spherical shell, with radius R, angular velocity ω, and surface charge density σ. Use the Maxwell Stress TensorHomework Equations F=\oint \limits_S \...
  36. D

    Maxwell 2D (ANSOFT): Error analysis

    Dear all, I've done many analysis in Maxwell, but in the last ones I'm paying special attention to the error plots. I've been ploting Energy Error and Time Error, but I've got the feeling that I don't know how to properly interpretate it. Fist of all, to validate one simulation, should I...
  37. D

    Maxwell 2D (ANSOFT): Band problem

    Dear all, I'm a common user of Maxwell v15, though this is the first time I've tried to work with Linear Motion and Force calculation in it. I've got two solids translating in my model, and they get in a electromagnetic field área. I want to calculate the braking force in each object, so I've...
  38. S

    Magnetostatic simulation in ansys maxwell

    i am doing a project on effect of high voltage transmission on human. here, i am facing problem in assigning current excitation to power cable in ansys maxwell. whenever i assign current excitation i get an error message " no conduction path found". please, someone help me in this matter.
  39. A

    How did Maxwell's theory predict that c is constant?

    In the book, briefer history of time, hawking says that maxwell's theory of electromagnetism, concluded that speed of light is finite and constant, which made other physicists to give up the idea of absolute time, and think of newer concepts. How did maxwell, through his theories, correctly said...
  40. T

    Combine Special Relativity & Maxwell Equation Easily

    How to combine special relativity and maxwell equation as simple as possible without going into qed? Sorry for such a absurd request as I am not smart at all.
  41. A

    Integrating Ansys 15 and Maxwell 14: Compatibility Guide

    Hi everyone Can Maxwell 14 be integrated with Ansys 15? If yes how? and if it's not, what version of Ansys does fit with Maxwell 14?
  42. Einj

    Maxwell Field in General Relativity: Explained

    Hello everyone, I'm studying some applications of AdS/CFT and I came across an expression of the Maxwell field written in the following way: $$ A=A_t(r)dt+B(r)xdy. $$ How does this notation work? Is it simply a way of writing the four-vector? If so, why do we use this notation? Thanks a lot!
  43. A

    Can I draw a helical coil in MAXWELL 3D using PF and ANSYS?

    I'm a new user to both PF & Maxwell 3D. I've been having a lot of problems trying to draw a helical coil in Maxwell 3D v11. the problem is how to connect the two tub in 3D here is the image imported MAXWELL...
  44. F

    Maxwell distribution in thermal equilibrium

    Homework Statement In thermal equilibrium, the particle in a gas are distributed in velocity space according to the Maxwell distribution f(v) = A*exp(-mv^2/(2KT)) What is the average velocity ? What is the most probable velocity ? Homework Equations <v> = ∫∫∫vf(v)d3v = (0 to infinty)...
  45. J

    Covarient Maxwell: Explaining 2nd Line From Attachment

    can some tell me why the second line follows from the first in the attachment thank you
  46. S

    Understanding the Displacement Current: Examining the 4th Maxwell Equation

    Homework Statement Simple question: - I am not sure about the translation: That second term is called displacement current? Or not? - The question: Is the displacement current a consequence of time dependant electric field OR is it the other way around? :/ Homework Equations ##\nabla \times...
  47. M

    Ansoft maxwell 15, parameters-assign-matrix option disappear

    I am learning to use software to do some simple simulation. It seems that the Maxwell 2D/3D-parameters-assign-matrix option disappears sometimes. Under the menu of Mawell 2D-Parameters-Assign, only Force and Torque can be seen. In what cases the Matrix option is visible? What should I do if I...
  48. M

    Maxwell ansoft region effect to solve

    Hi i have to solve problem in maxwell ansoft in magnetic step . When i create a region (no mesh and no boundray for region) my answered is not real and it is change when i change size a region (i try to solve B in center of coordinate of coil)
  49. P

    Ansoft Maxwell -- shaping an interior electric motor rotor

    For shaping an interior PMSM rotor from top figure to as in bottom fig, I made an equation based curve, united with another curve , made a surface using coverline and united that shape with my rotor. When validated it showed band and rotor intersecting and I adjusted the band - DiaGap. Then...
  50. C

    Curved-space Maxwell equations by differential forms?

    The flat-space source-free Maxwell equations can be written in terms of differential forms as $$d F = 0; \ \ d \star F = 0.$$ And in the theory of gauge fields, one can introduce a connection one-from A from which one can formulate general Maxwell equations (for Yang-Mills fields) by $$ dF + A...
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