Do anyone have some e-paper on dynamics of ferrofluids? Please contact with me.thank you very much!?
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Here is a great lab on ferrofluids that I am familiar with. Some info about ferrofluids is in there, too.\n\nhttp://mrsec.wisc.edu/Edetc/nanolab/ffexp/index.html
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http://www.allaboutcircuits.com/vol_6/chpt_7/5.html\nhttp://hyperphysics.phy-astr.gsu.edu/Hbase/electronic/nandlatch.html
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best I could find for you (and me as I am in the midst of working on own company issues):\nwww.tradedynamics.com/docs/pdf/sclm_showcase.pdf
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>>Theory of magnetocrystalline anisotropy\n\nThe direction of a magnetization relative to body that supports it is determined mainly by two effects, shape anisotropy and magnetocrystalline anisotropy. The first arises from magnetostatic effects and the second from spin-orbit coupling between the spins and the lattice of the material. The magnetostatic effects can be calculated from micromagnetic calculations, but the magnetocrystalline anisotropy must be computed from the electronic structure of the material. This is an important quantity because it determines whether a magnetic material can be made into a good hard magnet, a good soft magnet or neither. Hard magnets are an essential component of electromagnetic motors and soft magnets are an essential component of transformers.<<\n\nThe rest of that quote can be found in the source link:
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Try: allaboutphysics.com I think that might help.
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Magnetic force........
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I hope the following links help:\n\nhttp://galileo.phys.virginia.edu/outreach/8thgradesol/Magnet.htm\n\nhttp://www.phy.syr.edu/courses/PHY222.05Fall/manuals/magneticfield.pdf\n\nhttp://www-personal.umd.umich.edu/~devlin/phys151/Lab_M151-8.PDF\n\nhttp://electron9.phys.utk.edu/phys136d/distlab/lab8.htm
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fluids - convection is due to the movement of molecules
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these guys do it much better than i can:\n\nhttp://hyperphysics.phy-astr.gsu.edu/Hbase/class/phscilab/kundt2.html
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I hope this helps.\n\nAsk A Scientist\nPhysics Archive  \n\n--------------------------------------------------------------------------------\n\nRipples in Water \n\n10/29/2004 \n\n \nname         Susanne H.\nstatus       educator\nage          50s\n\nQuestion -   What is the scientific explanation of how a ripple is\nformed when something is dropped onto water?  Why not just one wave?\n-----------------------------------------------------------------------\nThe ripple effect is similar to a spring. Unless a spring is carefully\n"damped" the weight on the end of a spring will oscillate up and down. A\nsimilar thing happens when a weight is dropped into a pool of liquid. The\nweight "pushes" the liquid down, but because the liquid has been displaced\nfrom its equilibrium point it recoils back up. The exchange of potential\nand kinetic energy back and forth causes a ripple in the liquids surface\nback and forth until friction causes the waves to decrease in amplitude.\n\nVince Calder\n=====================================================\nDear Susanne,\n\nThe train of ripples is caused by the oscillation of the water at the point\nthe stone is dropped.  Initially, the stone depresses the water under it.\nThe depressed water is then lifted by the buoyancy of the water around it.\nSince the top of the depressed water is under the top surface of the rest of\nthe water, the buoyant force on it is greater than its weight and so the\nwater is rapidly accelerated upwards.  When it reaches its original level\n(lined up with the top of the rest of the water), it is moving upward and\nwill continue some distance above the rest of the water.  Eventually, of\ncourse, its unsupported weight causes it to stop and start falling down.  It\nwill again overshoot its equilibrium position and continue downward some\ndistance. This oscillation continues until the energy lost to the viscosity\nof the water finally brings it to rest in its original position.\n\nThe up and down oscillations of the water which was originally under the\nstone cause the waves to form which propagate outwards in a circular\nfashion.\n\nBest, Dick Plano...\n=====================================================\n\n\n\n--------------------------------------------------------------------------------\n\n  Back to Physics Ask A Scientist Index \nNEWTON Homepage Ask A Question \n\n\n\nNEWTON is an electronic community for Science, Math, and Computer Science K-12 Educators.\nArgonne National Laboratory, Division of Educational Programs, Harold Myron, Ph.D., Division Director.
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please (2 pdf documents)\nhttp://physics.angelo.edu/~dbixler/phys3444lab4new.pdf\nhttp://physics.angelo.edu/~dbixler/phys3444lab8.pdf
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Carl Wilhelm Oseen was a professor in Uppsala, and also the person who nominated Einstein for the Nobel Prize for the photoelectric effect. One of the areas he worked in was the flow of anisotropic fluids, and liquid crystals, etc. Reading a bit of the literature, what I suspect is called an oseen flow is an approximation to the full fluid dynamic equations that allow them to be solved easier in certain situations, and still be good models for the physics (incompressibility is assumed, I suspect, for example). I gather a major feature is assumption of a linear model for the inertia term in the Navier-Stokes equations (see the notes for the MIT course, in the references).  \n\nOne could dig into this much deeper of course. I have attached a couple of references I looked at.
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The most coherent description I could find was at wikipedia under "spin glass". It's about the time-dependent magnetic characteristic of certain materials that can enter a spin glass phase above a critical temperature. Mean field theory (click the link to this on the referenced page) has been used in theorizing on these dynamics.
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You could look for this book from Lindsay Publications:\nhttp://www.lindsaybks.com/bks5/dynamo/index.html
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I hope this will help. \nFor dynamics see reference 2
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http://theory.uwinnipeg.ca/physics/
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Solve your homework? Heh... I recommend Wikipedia to help you learn about entropy and ectropy. If they are not helpful to you, I'm sure there are some useful links (see the reference part).