Coupling Definition and 355 Threads

What do AC/DC coupling mean in oscilloscope?

Three identical train cars, coupled together, are rolling east at 4 m/s. A fourth car traveling east at 6 m/s catches up with the three and couples to make a four-car train. What is the speed of the four-car train? I have no idea what to do. Please Help...thanks in advance :)

Hello everyone... I am new in engineering and I've given a topic about 'Universal Coupling'. But when do some research with Google, it seems don't have some information about the topic. Is anyone can help me to find some link or information? Is universal coupling = universal joint? Thanks...

At page 52 of 4th chapter in "An Introduction to gauge theories & modern particle physics" by Leader & Predazzi one can find such statement: "We must therefore rearrange (4.2.4) so that we can identify the field that multiplies\frac{1}{2}\left(1+\tau_{3}\right) as gauge boson that remains...

When considering a simple hydrogen atom, which essentially is an electron moving in a spherical electric field, you don't need to take spin-orbit coupling into account. For larger atoms you do. I don't understand my books' very brief explanation of this. I am thinking that the electron has as...

Can two magnets produce a magnetic field strong than the simple vector sum of their individual fields when near each other? The backstory: I purchased some crazy 1/2" Neodymium (alloy) magnets off ebay. The ad claimed 6.1 lbs/ea ideal maximum pull force. Naturally skeptical, I took out our...

Hi there, I'm going to couple WIMS & CITATION as neutronic codes with COBRA as an thermalhydraulic code. Please let me know if there is any resources, papers or tips and tricks to do so. Thanks

I hope this post in the appropriate forum. I have a spectrograph and a CCD imaging chip that I am using for an optics experiment. The light coming into the spectrograph is through a 10 micron fiber optic. In order put the light on the CCD imaging chip the way I want it, I believe I need to...

Hey, I've recently started to revise for a spectroscopy test and had a random retardation moment where I asked myself "Why don't protons on a methyl group couple to eachover?" The answer seemed obvious, there all in the same chemical environment and all sigma bonded to whatever substituent you...

When dealing with system containing millions of particles( for example, charged particles or magnetic particles) with statistical mechanics, I may often see the description or explanation that the certain effect is due to the coupling or correlation of particles. So can anybody give me a...

Via http://dorigo.wordpress.com/2008/03/08/top-mass-1726-14-gev/ The yukawa coupling of the top is now measured to be 0.9914 \pm 0.008 Theoretic suggestions about why it is so are welcome.

I am not sure where to post this question since it involves GR and particle physics but here it goes. I am reading in a book that when coupling a spinor to gravity, one replaces \partial_\mu \psi [/tex] by a covariant derivative D_\mu \psi [/tex] which must transform like a spinor under...

Hi all, I have a little problem concerning the coupling of a fermion to CP^N (or better a 2D scalar O(3) model). Its not a mathematical type of problem. I just read on "The coupling of fermions to the three-dimensional noncommutative $CP^{N-1}$ model: minimal and supersymmetric extensions"...

Why is it that the two pendulums must have equal masses if complete energy transfer is to take place, assuming the angular frequencies are commnesumerable.

[SOLVED] QM: Spin -orbit coupling: Solve [(L.S), L] Homework Statement Griffiths problem 6.16 Solve the following commutators (he lists a bunch but i can't get even the first one) (a) [(L.S) , L] (b) [(L.S) , S] (c) [(L.S) , L^2] there's a few more, but i think if i get the idea then...

I was trying to understand why for every spin configuration of a ferromagnetic system, there exists a corresponding isoenergetic state of an antiferromagnetic system. Can I treat an antiferromagnetically coupled 1-D ising model as a combination of two interpenetrating sublattices which are...

Homework Statement An electron in a hydrogen atom is in the n = 2, l = 1 state. It experiences a spin-orbit interaction H' = \alpha \mathbf{L} \cdot \mathbf{S}. Calculate the energy level shifts due to the spin-orbit interaction.Homework Equations Degenerate perturbation theory. The Attempt...

Name the methods of coupling motors to drive a load...

Pls help me calculate the shaft radius of a coupling system that's goin to rotate an prespex cylindrical at 100 rpm by a motor... the dia of cylinder is 6 in and its width is 1 in. the material to be rotated is 10 gm s of sand... bulk density if the sand is 3000 kg per m^3...

Homework Statement Show that when tree identical quadrupole phonons (boson) are coupled togheter, only states with total angular momentum 0,2,4 and 6 are allowed. The Attempt at a Solution I know "how" to do it, but i do not know how to couple three angular momenta. In the case of...

I have in mind to recreate a Brit v twin (in a fashion) using two single cylinder engines coupled together, as i see it i have three options for the linking method, chain, toothed belt, or gears, gears would be the most (ridged) coupling, the chain and belt would have some flex, the other...

Hello; By using the gauge d.A+A.A=0 to find the quantum Lagrangian density, I found a term of Ghost-Photon coupling.does it have a physical significance? And why one does not find it in the gauge d.A=0? Thank you.

Marcus! Surely, I’m not the only one reading the links that you provide! http://arxiv.org/PS_cache/arxiv/pdf/0706/0706.1534v1.pdf Coupling gauge theory to spinfoam 3d quantum gravity Simone Speziale June 11, 2007 Note: The Acknowledgments: The author is particularly grateful to Carlo...

Hi, I’ve just been reading about the mutual inductance coupling that can exist between adjacent conductors in a 3-phase power distribution system. I’m hoping to clear something up in my mind, if we want to model the imposed mutual impedance, is it represented as impedance between the lines...

I am looking for some information on antenna coupling. I am looking at coupling energy from one transmitters antenna into another antenna. Basically instead of using the antenna on the transmitter itself, I need to use the second antenna. This is for a project at work. I designed a second...

What is "optical coupling" ?? This may problem may sound stupied, but what is "optical coupling" ?? I did surf the net to find some information, but I can't find the definition of optical coupling, and I can't even find it in "Encyclopedia of Modern Optics". Could someone please tell...

Hi, this is my first post here so apologies for any faux-pas I inadvertly do. Anyways, to the subject at hand. Evanescent Wave Coupling -> abbrv. -> EWC Can someone explain to me evanescent (decaying) waves work? I have been reading a wiki article about EWC, and it made many...

3j, 6j, 9j -symbols, Wigner-Eckart theorem, reducible matrix element, irreducible (spherical) tensor. I just cannot understand the notation. I just cannot fully understand the physics behind those concepts. Where can I find fully worked out example calculations? Especially, the notation is...

Hi, since I don't have exact knowledge about materials and particle coupling, I want to ask for result of simple experiment: imagine you have very tough stick 10 meters long. Let's say the stick is fitted on firm steel table in sliding blocks. Table is equipped with actuator strong enough...

An inter city Express locomotive pulls 14 cars, each with a mass of 53,000 kg. What is the tension in the coupling between the thrid and fourth cars when the acceleration of the train is 0.26m/s. ok so I am looking for T. F=ma 53000(0.26) = T? i don't think this is correct because they...

Here is the abstract. And here is a related article. With the arctic ice melting, should we expect a weakening of the warm northerly flow? Since we are in the midst of a giant atmospheric experiment, with the only currently habitable planet that we have, I wonder how much understanding...

A 97 250kg train pulls two freight cars. The first car has a mass of 51 355 kg and the second has a mass of 18 400 kg. The whole train accelerates at .01750m/s^2. What is the tension in the coupling between the locomotive and the first car? A. I used Ft=ma and took (51355)(.1750)= 8987.1 N...

Hi, We're looking at the consequences of the Stern-Gerlach experiment which has lead us to the idea of spin orbit coupling in the hydrogen atom. In class, the coupling term of the Hamiltonian was derived by assuming the electron has a magnetic moment, then viewing the hydrogen atom in the...

I have a glue pump system need to operate it by an electrical motor , so don't know how to choose the coupling designation ... may be there are some designation tables or other websites helping for that thing . also if there are some EQUATIONS , about that to depend on . with my best wishes

Hey! My teacher gave me a very challenging problem on QM. I've only had one introductiary course, but he said he wanted me to figure this problem out by using whatever resources, so now I turn to you guys ;-). The problem is the following: London attraction forces can be thought of as...

I'm a little confused as to whether the following commutation relations still hold when spin orbit coupling occurs: [Sx,Lx] = 0 [Sx,Ly] = 0 [S^2, Lx] = 0 [L^2, Sx] = 0 etc. thanks very much for your help

I have read that, on the scale of clusters (million light years) the effect of the expansion of the universe is 10 million times smaller than the gravity binding the cluster. So space time, (flows) through the cluster (like a super fluid) or akin to a group of logs staying in a fixed...

why does spin-orbit coupling have a positive and negative sign?

I have a little doubt. EM waves are coupled electric and magentic oscillations. But, to produce an electric field you need a charge and for a magnetic field, you need a moving charge ,but,electric field doesnot exist with a moving charge. So, what is the source of Em waves and moreover how...

textbook defines "coupling capacitor" just curious... my textbook defines "coupling capacitor" as "ideally appears as an open to dc and as a short to ac." but what does that have to do with "couple" in the english sense? i'm not an electronics major, but I'm taking a course in electric...

Hello I have two resonant circuits (tuned to the same frequency) that are magnetically coupled to each other via two coils placed parallel to each other. (energy and data is transferred from one circuit to another) Now, I know that the coupling between the two can be overcoupled...

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

I have read papers regarding mechanisms responsible for maintaining the compactness of the extra dimensions and also read papers regarding how the 3 large dimensions became large. Mechanisms include: 1) Casimir Energy 2) Strings winding around the compact toroidal directions. Could...

I have a very basic question about exactly how to match the experimentally measured masses and coupling constants to the parameters in the lagrangian density in a given QFT. Let me specialize to a particular theory and perhaps people here can help me out. I've just computed the tadpole and...

I was wondering if anyone has any insights or can guide me to some decent literature of the coupling of the graviton to mass. I became intrigued about this when thinking about presenting the gravitational interaction in a Feynman diagram. If anyone has any ideas or knows I would greatly...

can anyone explain to me how the LS coupling scheme work? thanks

When doing L-S coupling scheme for (3d)4, I am asked to find the ground state. I know that the first step, according to Hund's rules, is to find the the S with the largest value (S, L are total values, s, l are individual values). It is obviously S=2. Next, I should proceed to find the largest...

What is antiferromagnetic/ferromagnetic coupling, and what is the difference between the two? I'm referring to coupling between two two-level half-flux quantum systems for example.

In Bohr's model of hydrogen atoms, a 1s electron would orbit the proton quicker than a 2s electron.If we slowed down the 1s electron slightly we would normally expect it to spiral towards the proton.But not if we could decrease the force acting on the slower moving electron.If the electric...

I'm trying to find a coupling reagent for reacting an amine with a carboxylic acid. Currently I am using TBTU with fenchyl amine hydrochloride, but the amine seems not to want to react witht the carboxylic acid. Are there some better coupling reagents than TBTU out there that anyone knows of?