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Topic: Thermal motion

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	Molecular motion and protein folding
		Thermal motion - displacement of functional groups - is necessary for protein catalysis (high substrate specificity and transition state stabilization) and allostery (transmit information to other units in a protein complex).
		Thermal motion produces a random walk of every atom in a structure and steric hindrance restricts the calculation to allowed conformations as determined by the torsion angle plot of proteins (Ramachandran plot).
		This difference in time scale of substrate diffusion and protein motion is important for all enzymatic activities as shown for hemoglobin, where the static structures of the T and R state show no energetically favorable pathway for oxygen to diffuse to and away from the heme group.
	www.whatislife.com /reader/motion/motion.html (2505 words)

	Brownian motion - Wikipedia, the free encyclopedia
		The Brownian motion of particles in a liquid is due to the instantaneous imbalance in the force exerted by the small liquid molecules on the particle.
		Brownian motion is related to the random walk problem and it is generic in the sense that many different stochastic processes reduce to Brownian motion in suitable limits.
		For a particle experiencing a brownian motion corresponding to the mathematical definition, the equation governing the time evolution of the probability density function associated to the position of the Brownian particle is the diffusion equation, a partial differential equation.
	en.wikipedia.org /wiki/Brownian_motion (1641 words)

	Basic Properties of Matter: Chapter V
		From the physical standpoint, therefore, the thermal motion is a net outward motion that adds to the gravitational motion (which is outward in the time region) and displaces the equilibrium point in the outward direction.
		Inasmuch as the thermal motion is a property of the individual molecule, not an aspect of a relation between molecules, the factors that come into play at distances less than unity do not apply here, and the direction of the thermal motion, in the context of a stationary reference system is always outward.
		Coincident with this outflow there is an inflow of thermal motion from the environment, and, in the absence of an externally maintained unbalance, an equilibrium is ultimately re ached at a point where inflow and outflow are equal.
	www.reciprocalsystem.com /bpm/bpm05.htm (4121 words)

	CHAPTER 11
		The zero for the thermal motion of the atoms is the equilibrium condition, in which the atom is stationary in a three-dimensional coordinate system of reference because the motion imparted to it by the progression of the natural reference system is counterbalanced by the oppositely directed gravitational motion.
		On the other hand, the zero for the thermal motion of the electrons, the magnitude of the motion of the electrons in the absence of thermal motion, is the natural zero, which, in the context of the stationary reference system, is unit speed, the speed of light.
		The reason for the extension of the high temperature linear relation to a lower temperature in application to thermal conductivity is that the specific heat under the conditions applicable to thermal conduction is not subject to all of the limitations that apply to the transmission of thermal energy by contact between atoms of matter.
	www.reciprocalsystem.com /bpm/bpm11.htm (3909 words)

	PowerPedia:Thermal energy - PESWiki (Site not responding. Last check: 2007-10-20)
		Thermal energy is a measure of the total vibrational energy in all the molecules and atoms in a certain substance.
		Thermal internal energy is present in all macroscopic objects in the universe.
		Potential thermal energy is the part of thermal energy stored in "deformation" of atomic bonds during thermal motion of atoms (as atoms oscillate around position of equilibrium they not only have kinetic energy of motion but also potential energy of displacement from equilibrium).
	peswiki.com /index.php/PowerPedia:Thermal_energy (3162 words)

	CHAPTER 8
		These theories visualize the thermal motion of a solid as an oscillation around an equilibrium position, but they fail to shed much light on the question as to why that equilibrium position should be displaced as the temperature rises.
		According to this theory, the thermal motion is not an oscillation around a fixed average position; it is a simple harmonic motion in which the inward component is coincident with the progression of the natural reference system, and therefore has no physical effect.
		At the solid end point the thermal motion is also in equilibrium with the inward progression of the natural reference system, as this is the point at which the thermal motion is able to cross the time region boundary without assistance from gravitation.
	www.reciprocalsystem.com /bpm/bpm08.htm (3398 words)

	T
		In systems consisting of many particles, be they solid bodies, fluids or gases, the constitutents are in constant, chaotic motion: the atoms in a solid crystal oscillate a bit, the molecules of a gas are in rapid, disordered motion, and so on.
		The energy contained in the disordered motion of a body's constituents - for instance, the energy of the disorderly motion of the atoms or molecules of a gas, or their oscillation in a solid body.
		In more extreme situations, thermal radiation can have energies that are even higher - for instance, the gases in the accretion discs of fl holes are so hot that they emit great amounts of thermal radiation in the x-ray region.
	www.einstein-online.info /en/navMeta/dictionary/t (1358 words)

	[No title]
		Thermal Stress—Once the waste packages are placed within the emplacement drifts, heat will be released as a part of the process of the radioactive materials in the waste packages becoming less radioactive over time.
		Thermal stresses at any location depend on the proximity and timing of waste emplacement, the amount of heat generated, the age of the waste, packaging and emplacement configuration, ventilation of the emplacement drifts, and the thermal-mechanical properties of the rock mass.
		A combination of the thermally induced stresses with time-dependent strength degradation results in time-dependent fracturing and a deterioration of the emplacement drift walls for Category 2, however, the drip shield is not expected to be covered during the postclosure period.
	www.ocrwm.doe.gov /documents/amr/36086/36086.txt (17336 words)

	EasyPrint - thermal transfer printer Installation photos
		The EasyPrint i is an Intermittent motion thermal transfer printer which can be configured to print directly onto packaging substrates in-line, or in conjunction with a labelling applicator such as the MR Labeller pictured to the left.
		The EasyPrint MLP is a traversing motion thermal transfer printer which is ideal for multiple lane printing onto packaging substrates in-line.
		The EasyPrint C is a continuous motion thermal transfer printer which is ideal for high-speed printing onto packaging substrates in-line.
	www.bell-mark.com /products/easyprint/installations.html (625 words)

	Thermal Motion Analysis
		The anisotropic displacement parameters describing atomic thermal motion are derived from the probability density function of each atom and the information that they contain, along with the observed atomic coordinates, enable a molecule to be analyzed as a dynamic figure rather than as a static entity.
		We have developed a software package to simulate the atomic thermal motion within a nucleic acid structure and perform a statistical analysis of the results.
		Thermal Motion Analysis is implemented in a C++ program for Windows and may be downloaded for academic use only.
	zlab.bu.edu /~hburden/Thermal_Motion_Analysis.htm (709 words)

	BIASED THERMAL MOTION AND THE SECOND LAW OF THERMODYNAMICS
		The motion of the button is obviously "biased" - it is not isotropic but rather occurs in a plane perpendicular to the line connecting the thumbs.
		The only essential difference between the motion of the button and peptide librations is that the latter, being a variety of biased thermal motion, do not need any external reinforcement.
		Once the impediment to the motion is removed ("the spoke is taken out of the wheel"), librations resume all on their own.
	www.wbabin.net /valev/valev2.htm (4091 words)

	Small Times: News about MEMS, Nanotechnology and Microsystems
		Brownian motion, the random movement of tiny objects caused by thermal energy, could be harnessed and directed, said Ronald Fox, chairman of the physics department at the Georgia Institute of Technology.
		The motion wasn’t driven by any innate life force in the pollen, itself, but as a result of the thermal energy of the surrounding fluid, with molecules of the fluid randomly and constantly bombarding whatever small particle is suspended in it.
		At the macroscale, Brownian motion or diffusion – it is the same process that causes gases over time to spread evenly through a confining area such as a room – is relatively slow.
	www.smalltimes.com /document_display.cfm?document_id=1822 (1020 words)

	MM basic theory - WiseNano
		Thermal motion is random, but high energy motions are rare; in general, thermal motion will not provide enough energy to break a single bond, and a single bond provides sufficient stiffness to limit motion to a fraction of a nanometer.
		To resist thermal motion driving a system from a set state to an undesired state, an energy barrier is required.
		If the barrier is within a certain range, then thermal motion can supply the energy, and the mechanical system can accelerate the reaction simply by holding the reactants near each other, increasing the effective concentration by several orders of magnitude.
	wise-nano.org /w/MM_basic_theory (4319 words)

	THE SIMPLIFIED OMEGA EQUATION (THERMAL ADVECTION TERM)
		This essay will be interested in the operational meteorology interpretation of thermal advection and the contribution it gives to vertical motion.
		Since cooler air is more contracted than warmer air, this contraction in the low levels forces a sinking motion aloft to compensate for the reduction of volume in the LL.
		There is not a direct relationship between thermal advection and resultant vertical motion in the atmosphere since other lifting and sinking mechanisms can complicate the picture (i.e.
	www.theweatherprediction.com /habyhints/254 (763 words)

	[Cscc] T-T, Brownian mot.
		Brownian motion is a fluctuation phenomenon of THERMAL EQUILIBRIUM.
		Accordingly, the > > motion of molecules in a gas is Brownian motion--only it is unobsevable, > > while that of pollen grain in water, again due to random molecular > > impacts, is observable under a microscope.
		By this criterion, the motion of a > > dust particle is not Brownian.
	mm.gnu.org.in /pipermail/cscc/2003-July/000055.html (928 words)

	The Open Door Web Site : IB Physics : Electrical Conduction in Metals
		The arrows represent the random thermal motion of the electrons (their average speed at room temperature is hundreds of kms
		If the piece of metal is part of a circuit through which a current is flowing, then another motion is added to the random thermal motion (see figure 2).
		This motion is more regular and results in a general "drift" of electrons through the metal.
	www.saburchill.com /physics/chapters/0037.html (325 words)

	Evaporation
		Evaporation is the process whereby atom s or molecule s in a liquid state (or solid state if the substance sublime s) gain sufficient energy to enter the gas eous state.
		The thermal motion of a molecule must be sufficient to overcome the surface tension of the liquid in order for it to evaporate, that is, its kinetic energy must exceed the work function of cohesion at the surface.
		In addition, molecules in motion have more energy than those at rest, and so the stronger the flow of air, the greater the evaporating power of the air molecules.
	www.nebulasearch.com /encyclopedia/article/Evaporation.html (513 words)

	Vorticity and vert motion
		Of course, the resulting vertical motion may not be very strong (the integral of a noisy "forcing" field isn't going to be very large), so the QG signals are perhaps too weak to be of significance in such cases.
		To the extent that it is a significant contributor to vertical motion, ignoring the contribution to vertical motion from thermal advection seems quite obviously to be a perilous assumption.
		Hence, QG implied vertical motion may be reasonable on scales where the QG assumptions are not met, largely because of the importance of the thermal advection term and its connection to adiabatic flow.
	www.cimms.ou.edu /~doswell/PVAdisc/PVA.html (3924 words)

	Determinism - Wikipedia, the free encyclopedia
		The quantum development is at least as predictable as the classical motion, but it describes wave functions that cannot easily be expressed in ordinary language.
		Since molecules are in constant thermal motion, the exact timing of the radioactive decay that produced the fatal alpha particle matters.
		If probabilistically determined events do have an impact on the macro events, such as whether a person who could have been historically important dies in youth of a cancer caused by a random mutation, then the course of history is not determined from the dawn of time.
	en.wikipedia.org /wiki/Determinism (4106 words)

	Nanorex, Inc. - Unmasking the Stroboscopic Illusion
		This creates the illusion that the atoms all vibrate at the frame rate, which is far too close to the frequency of the machine's moving parts.
		Eric Drexler, has produced a video that shows thermal motion realistically and contrasts this with the standard illusion.
		By showing the motion at higher and lower frame rates, the relationship between thermal and mechanical motion becomes clear.
	nanoengineer-1.com /content/index.php?option=com_content&task=view&id=14&Itemid=42 (269 words)

	Thermal motion - Wikipedia, the free encyclopedia
		Thermal motion is motion on the scale of molecules caused by heat.
		Brownian motion is an example of a phenomenon caused by thermal motion.
		This page was last modified 03:10, 7 July 2006.
	en.wikipedia.org /wiki/Thermal_motion (93 words)

	Thermal Motion of Magnetic Iron Nanoparticles in a Frozen Solvent (Site not responding. Last check: 2007-10-20)
		The thermal rotation of iron nanoparticles dispersed in cyclohexane was studied by measuring the dynamic magnetic susceptibility above and below the freezing point of the solvent.
		Below the freezing point, complete arrest of particle motion was expected, such that the magnetic dipoles would only be able to reorient themselves inside the nanoparticles (Néel relaxation).
		However, we find that thermal motion continues well below the temperature at which the bulk of the solvent is frozen.
	pubs.acs.org /cgi-bin/abstract.cgi/langd5/2005/21/i04/abs/la048385c.html (235 words)

	IECEC-98-318 (Site not responding. Last check: 2007-10-20)
		Actually, thermodynamic work is to show how chaotic molecular motion (thermal energy) is converted into synergetic mechanical motion, for example a piston in a cylinder of a heat engine.
		Equilibrium entropy of all system as a function of thermal energy S(E) that is kept by two bodies can be found from common accepted postulate of equilibrium thermodynamics that both energy and entropy of any thermodynamic system as a whole is equal to sum of energies and entropies of their parts.
		Thermal equilibrium of radiation with matter of the cavity is basis of thermodynamic of equilibrium radiation
	www.gpi.ru /~sukhodol/free/h1/u1.htm (5585 words)

	Unique Random Motion May Perform Key Cellular Functions
		The accepted explanation for this motion is that the kinesins use their two leg-like "heads" to walk along the microtubule paths in a deliberate way, fueled by the energy molecule adenosine triphosphate (ATP).
		Reported in the early 1800s by biologist Robert Brown, Brownian motion is the irregular activity of tiny particles suspended in a fluid.
		It results from the thermally driven movement of molecules in a fluid, the velocity of the particles depending on the temperature.
	gtresearchnews.gatech.edu /newsrelease/KINESIN.html (1212 words)

	Thermal motion Info
		The motions between the CFUs which form a crystalline assembly are along the directions of the joins between them.
		The direction of the motion is perpendicular to the plane.
		THERM links to ThermalBook.pdf an excerpt from Octahedron1sEd.pdf which describes the thrermal motion of CFUs in different crystal classes, thermal and electrical conductivity, thermal expansion of solids, the Wiedemann-Frantz relationship, thermoelectricity, kinetic theory, and specific heat.
	homepage.mac.com /whitby/Personal26.html (179 words)

	Bunsen Learner At the School of Chemistry, University of Edinburgh
		In practise atoms vibrate about their equilibrium positions: this is called thermal motion.
		Thermal motion is a displacement parameter that needs to be considered when calculating (i.e.
		Thermal motion is most thoroughly treated as being anisotropic (i.e.
	www.chem.ed.ac.uk /bunsen_learner/thermal.html (253 words)

	IUCr99 COMPUTING SCHOOL: Modelling thermal motion and disorder
		Strictly, the harmonic model is applicable only if the motion is purely translational, but provided the libration amplitudes are not too large it is a good approximation.
		Note that the relationship between the atomic U and A matrices introduces dependences of the structure factor on the atomic co-ordinates, in addition to that coming from the geometry factor; this will have consequences for the design of the refinement program, as it implies that co-ordinate and displacement parameters cannot be treated as independent.
		The motions of the atoms in the group are thus simulated as an isotropic "riding" motion superimposed on the anisotropic group motion, so the U used in the structure factor calculation becomes:
	people.cryst.bbk.ac.uk /~tickle/iucr99/s43.html (612 words)

	Crossing the Quantum Frontier
		Over very short periods of time, the irregular, "noisy" part of this motion is most evident as the dust particle flits to and fro.
		In normal quantum theory, this drift is all there is. But in the GRW scheme, the wave function's continuous drift (spreading) is interrupted every 100 million years or so by a sudden, random event that drives it to collapse again to a small volume.
		Over very short periods, the irregular part of the motion is most important, and the wave function fluctuates haphazardly.
	www.fortunecity.com /emachines/e11/86/qfront.html (2623 words)

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