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Topic: Polarization in electrostatics

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	Wikinfo \| Polarization (Site not responding. Last check: 2007-09-30)
		In technical terms, the axis is the B component (magnetic); the plane orthogonal to it is the E component (electric) a.k.a the plane of polarization.
		The amount of amplitude of polarization x that passes through a polarizer that passes y is 1/2 the distance between x and the antipode of y; the intensity is (x·y+1)/2.
		In electrostatics, the polarization is the vector field that results from permanent or induced dipole moments in a dielectric material.
	www.wikinfo.org /wiki.php?title=Polarisation (1058 words)

	Electric charge - Wikipedia, the free encyclopedia
		Furthermore, even when the net charge is zero, it can be distributed non-uniformly (e.g., due to an external electric field), and then the material is said to be polarized, and the charge related to the polarization is known as bound charge (while the excess charge brought from outside is called free charge).
		He was followed in 1660 by Otto von Guericke, who invented what was probably the first electrostatic generator.
		Other European pioneers were Robert Boyle, who in 1675 stated that electric attraction and repulsion can act across a vacuum; Stephen Gray, who in 1729 classified materials as conductors and insulators; and C.
	en.wikipedia.org /wiki/Electric_charge (1141 words)

	Polar Heart -- Recommendations and Resources (Site not responding. Last check: 2007-09-30)
		Note 1: States of polarization are described in terms of the figures traced as a function of time by the projection of the extremity of a representation of the electric vector onto a fixed plane in space, which plane is perpendicular to the direction of propagation.
		In general, the figure, i.e., polarization, is elliptical and is traced in a clockwise or counterclockwise sense, as viewed in the direction of propagation.
		Molecular polarity is dependant on the difference in electronegativity between to atoms in a compound and the asymetry of the compound's structure.
	www.becomingapediatrician.com /health/118/polar-heart.html (717 words)

	Polarization
		The polarization P is the dipole moment per unit volume, qd/V = q/A. P is uniform throughout the cylinder.
		A body such as this with a permanent polarization P is called an electret, by analogy with "magnet." Actual electrets, left exposed, will attract stray charges from the surroundings, which will soon neutralize the surface charges.
		When this region is removed, the polarization now has a discontinuity on the remaining surface of the dielectric, and the resulting bound charge creates a field that represents the net effect of the other molecules of the dielectric on the one in question.
	www.du.edu /~jcalvert/phys/polariza.htm (3569 words)

	An effective fragment method for modeling solvent effects in quantum mechanical calculations
		Consistent with expectations, the electrostatic field effects from the EFPs used to represent the non-participating parts of the active site are found to differentially stabilize certain structures along the reaction pathway.
		When combined with an accurate multipole representation of the electrostatic energy, such as in the effective fragment potential method, ab initio electrostatic energies are generally reproduced to within 0.2 kcal/mol for a variety of molecular dimers and basis sets.
		Analysis of the molecular interaction energies in terms of its electrostatic, polarization, and exchange-repulsion/charge-transfer components reveals that the electrostatic contribution is the dominant term in determining the energy ordering of the minima on the (H2O)(n) potential energy surfaces, but that differences in the polarization and repulsion components can be important in some cases.
	www.uiowa.edu /~quantum/efpab.html (2805 words)

	Fairfield University :: College of Arts and Sciences :: Course Descriptions
		Other topics discussed include polarization, vision, color and the perception of color, optical phenomena in nature, and in biological systems, color and light in art, simple optical instruments, sources of light and their spectra, lasers, and holography.
		Light, electricity and magnetism - a study of the nature of light, reflection, refraction, diffraction, and polarization; electrostatics, DC circuits, magnetic forces, electromagnetic induction, AC circuits, electrical instruments, generators and motors.
		Electrostatics and the concepts of field, flux and potential, Gauss' Law and its applications, vector and scalar fields and vector operators, energy of charge systems, dipole fields, Laplace's equation, magnetic fields, and potentials.
	www.fairfield.edu /x2580.xml (2145 words)

	Electrostatics
		We've found that the electrostatic force is similar in many ways to the gravitational force.
		If a body is polarized by a charged body, the side with like charge is farther away from the inducing body than the side with the opposite charge.
		The nearby charge distorts some of the electron orbits so that the atom itself is polarized in that the average location of its negative charge which is at sort of the center of mass of the electron orbits is a bit offset from it's nucleus, it's positive charge carrier.
	www.dl.ket.org /physics/companion/ThePC/compan/estat/Estat-t.htm (3440 words)

	Electrostatics
		This packet of charge has a magnitude denoted by e and comes in two "polarities" denoted by the plus and minus signs (positive and negative).
		All electrical charges are made up of these tiny packets and charges with the same polarity physically repel each other and opposite charges attract each other.
		The resulting electric field would attract one polarity of charge to the top plate and if the voltage was just right, the force of gravity could be perfectly balanced, freezing the particle in mid-air.
	www.techlib.com /science/electrostatics.html (5487 words)

	Dartmouth Physics and Astronomy - Teaching Labs
		Study the effect of the state of polarization of the light on the interference of light and attempt to verify the Arago-Fresnel Laws of interference of polarized light:
		Rays polarized orthogonally and then repolarized in the same way do not interfere if the original source was unpolarized.
		Rays polarized orthogonally and then repolarized in the same way do interfere if the original common source was polarized.
	www.dartmouth.edu /~physics/labs/descriptions/two.slit.interference.html (153 words)

	Electrostatics and the `Generalized Born' Solvent Model
		The electrostatic potential at a given point in space is the potential energy per unit charge that a test charge would have if positioned at that point in the electric field
		The energy of the charge distribution arising from this second term (the reaction potential) gives the electrostatic contribution to the solvation free energy.
		GB approximation (in red) to solvent polarization energies for two charges of equal radii as a function of separation.
	cmm.info.nih.gov /intro_simulation/node8.html (960 words)

	Welcome to Pengyu Ren's Web site (Site not responding. Last check: 2007-09-30)
		The error in electrostatic potential thus can be reduced by two orders of magnitude from that of current atomic charge model.
		2) The inclusion of explicit polarization enables the electrostatics to respond spontaneously to environmental changes (polar or non polar, neutral or charged, water or membrane etc.), as found in many biological events such as ligands binding to receptors, protein folding, and ions permeating through membrane channels.
		The intramolecular polarization is necessary to produce correctly the conformational dependence of electrostatics.
	dasher.wustl.edu /pren/research.htm (486 words)

	USC Chemical Engineering: Jerome Delhommelle
		The semi-classical density sums (Pixel) method: a new model for the evaluation of electrostatic, dispersion, polarization and repulsion contribution to intermolecular energies.
		Using distributed multipole models for the dominant electrostatic contribution to the lattice energy, we are generally successful in finding the known crystal structures at, or near the global minimum in the lattice energy.
		Several studies of polar, rigid organic molecules will be presented to illustrate the need for models for nucleation rates, solvent effects and other kinetic factors in polymorph prediction.
	www.che.sc.edu /faculty/delhommelle/Cecam3.html (2495 words)

	Electrostatics - Terms & Objectives
		You may download the complete physics standards by clicking here, or view the standards relevant to Chapter 32 - Electrostatics here.
		When you finish your study of electrostatics, you should be able to:
		name the unit of charge, and discuss its size with respect to common electrostatic situations and in terms of the number of unit charges it represents.
	www.batesville.k12.in.us /physics/phynet/e&m/electrostatics/electrostatics_t&o.htm (223 words)

	Physics - Current Students - The University of Auckland (Site not responding. Last check: 2007-09-30)
		Electromagnetism, including electrostatics, elementary circuits and the effects of magnetic fields.
		Develops the principles and applications of classical optics and the modern science of photonics, including geometrical optics, fibre optics, polarization, interference and diffraction.
		Topics include: electrostatics, dielectrics, polarization, charge conservation, magnetostatics, scalar and vector potentials, magnetic materials, Maxwell's equations, the wave equation.
	www.auckland.ac.nz /uoa/for/currentstudents/academiclife/transition-regulations/2006-course-prescriptions/faculty-of-science/faculty-of-science-physics.cfm (2471 words)

	Physics
		Electrostatics, magnetostatics, polarization, electrodynamics, Maxwell's equations, the electromagnetic potentials, classical radiation theory, electromagnetic waves, special relativity.
		Electrostatics, magnetostatics, polarization and magnetization, static boundary value problems and Green's function.
		Maxwell's equations, the wave equation and electrodynamic boundary value problems, the electromagnetic potentials, Lorentz covariant formulation of electrodynamics, radiation, application to optics, scattering and dispersion.
	www.students.ucr.edu /9596catalog/Physics.html (4262 words)

	Phun Physics - Topics
		It is this principle on which all electrostatics is based.
		When an uncharged object is polarized as described above, its net charge remains zero.
		An uncharged object means that the total number of positive charges equals the total number of negative charges.
	phun.physics.virginia.edu /topics/electrostatics.html (1034 words)

	ARC Net Future Directions
		However, the use of force-fields requires assumptions to be made about the minima to be sampled due to the inability to handle bonding changes in many approaches.
		Combining the advantages of bond-order potentials, for the short-range many-body component, with the important contribution of the long-range electrostatics and polarization will lead to a new generation of more reliable interatomic potentials that are applicable to most of the periodic table.
		Simulation of extended timescales: One of the greatest weaknesses of molecular dynamics as an approach to understanding the time evolution of a system is that it is only feasible to probe short amounts of real time, which is incompatible with the experimental processes being studied.
	www.ccms.uq.edu.au /cmsnet/future.htm (1472 words)

	More Info on Coulomb's Law and Induced Polarization
		At this level, students should examine the process of induced polarization, creating their own models to account for what they observe.
		This provides an opportunity to postulate the existence of a negative or positive charge that moves in or on a metal-coated object to produce that polarization.Various demonstrations or experiments involving charging conductors by induction should be carried out to give students opportunities to explain such phenomena with testable hypotheses.
		Students should explore the quantitative aspects of electric charge, including Coulomb's law as a proportion (not using the constant, k).
	dev.nsta.org /ssc/moreinfo.asp?id=1033 (260 words)

	Static (Site not responding. Last check: 2007-09-30)
		The ceiling is not charge-less, it just an equal number of positive and negative charges.
		This effect is called polarization (when the charges in an atom get slightly distorted due to other nearby charges).
		It gets polarized and then attracted to the screen.
	webphysics.davidson.edu /course_material/py230l_wc/demo/illustration22_4.html (327 words)

	ScienceDaily: Physics
		Neutron Physics Instrument May Unlock Mysteries Of Universe (September 17, 2004) -- Fundamental questions that particle physicists have pondered for decades might be answered when a.2 million neutron physics beam line is built at the Department of Energy's Spallation Neutron...
		UC Riverside Researchers' Discovery Of Electrostatic Spin Topples Century-old Theory (April 3, 2003) -- In a discovery that is likely to impact fields as diverse as atomic physics, chemistry and nanotechnology, researchers have identified a new physical phenomenon, electrostatic rotation, that, in the...
		Virginia Tech Partner In Discovery Of Quark Interaction (July 4, 2005) -- Physics researchers working at the High Energy Accelerator Research Organization (KEK) Laboratory in Japan have observed a new type of interaction among the most fundamental of particles, the quark.
	www.sciencedaily.com /encyclopedia/physics (5014 words)

	Modeling of Biomolecular Systems, Helsinki, Finland, June 2005: Program (Site not responding. Last check: 2007-09-30)
		Electrostatic interactions in biological macromolecules are among the most difficult ones to handle in computer simulations of macromolecules.
		It is usually required to rely on special techniques to accurately predict properties of proteins that strongly depend on electrostatics (e.g.
		Electrostatics at interfaces (electric double, 2D Lekner summation technique in membrane affinity calculations)
	www.apmaths.uwo.ca /~mkarttu/biomolecular/juffer.shtml (106 words)

	Physics at Mount Holyoke
		Topics include: electromagnetism, emphasizing fields and energy; electrostatics; electric circuits; magnetism; induction; and electromagnetic radiation.
		A comprehensive treatment of wave phenomena, particularly light, leading to an introductory study of quantum mechanics.
		Topics include wave propagation, polarization, interference and interferometry, diffraction, X-ray and electron diffraction, the wave nature of particles, the uncertainty principle, and Schroedinger's equation in one dimension.
	www.mtholyoke.edu /acad/phys/courses/descriptions.shtml (531 words)

	P&A History4.html
		Six microscopes were constructed, the last four being provided with a small plug-in unit at the back of the central control chassis to enable changes in the logic to be made for the analysis of spark chamber photographs.
		The scanner examined film in the neighbourhood of a vertex and, by means of a set of concentric circles, recorded the polar coordinates of sets of points at frequent intervals along each track radiating from the vertex.
		By constructing a scanning system covering a 96 x 96 pixel image with the 16 x 12 processor array, the image area was increased sufficiently to enable programmes to be written to process grey-level images by the use of bit-serial algorithms.
	www.phys.ucl.ac.uk /department/history/BFox4.html (17881 words)

	physics @ berkeley
		Electric polarization and orbital magnetization turn out to be surprisingly difficult concepts to define precisely in a quantum-mechanical context, despite the fact that they are central to any elementary treatment of electrostatics and magnetostatics.
		I will review the theories that have emerged to describe the polarization and magnetization in 1993 and 2005, respectively.
		The basic approach is to decompose the continuous charge distribution into localized packets, known as Wannier functions, whose contributions are well defined.
	physics.berkeley.edu /index.php?option=com_dept_management&act=events&Itemid=444&task=view&id=350 (163 words)

	Electrostatics Overview
		Lab Activity: Electrostatics 3 - Induction and Polarization
		Straws and Pens - Activities using simple materials that students can do at their desks concerning static charging, discharging, and forces.
		A Simple Electrostatic Generator - The Electrophorus - build an electrophorus from simple materials - cool!
	www.batesville.k12.in.us /physics/PhyNet/e&m/electrostatics/default.html (161 words)

	Vanderbilt Publication List
		Resta and David Vanderbilt, "Theory of Polarization: A Modern Approach," to be published as a chapter of a book on ferroelectrics (in press).
		David Vanderbilt and Raffaele Resta, "Quantum electrostatics of insulators: Polarization, Wannier functions, and electric fields," in Conceptual foundations of materials properties: A standard model for calculation of ground- and excited-state properties, S.G. Louie and M.L. Cohen, eds.
		Fabio Bernardini, Vincenzo Fiorentini, and David Vanderbilt, "Spontaneous polarization and piezoelectric constants of III-V nitrides," Phys.
	www.physics.rutgers.edu /~dhv/pubs/pub_list.html (3939 words)

	Image Force
		23rd July 2004 - 08:03 AM The image force is the interaction due to the polarization of the conducting electrodes (i.e.
		From the point of view of classical electrostatics the polarization of the conductors by external charges is caused by the additional potential on the conductors due to the charges.
		This extra potential is compensated by a charge flow from one electrode to another to keep the potential on the conductors fixed.
	forum.physorg.com /Image-Force_332.html (340 words)

	Critical Effect of the N2 Amino Group on Structure, Dynamics, and Elasticity of DNA Polypurine Tracts -- Lankas et al. ...
		In contrast to the variable electrostatic stacking terms, the van der Waals contributions (not shown in the table) are essentially
		is weak and is characterized by an intrastrand electrostatic repulsion.
		A well-behaved electrostatic potential based method using charge restraints for deriving atomic charges: the RESP model.
	www.biophysj.org /cgi/content/full/82/5/2592 (8866 words)

	~ Induced Dipole ~ TV Antennas, Car Antennas, Radio Antennas, UHF Antennas and More ~ Induced Dipole ~ (Site not responding. Last check: 2007-09-30)
		Altogether, this means that the particle gains an "induced dipole moment" (IDM) [22, 33] due to this polarization in the external field.
		Hydrogen Bonding Much of the hydrogen bonding effect is accounted for by the electrostatics that comes from the bond...
		It has therefore less strong intermolecular forces as the instantaneous-dipole induced-dipole attraction is less.
	www.antennacart.com /Dipoles5 (1693 words)

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