
	Where results make sense

Topic: Relaxation time

Related Topics

Group isomorphism

Seanbaby

Reflex (Australia)

In the News (Fri 25 Dec 09)

Northern Trust

Marvin Harrison

Peter Chernin

Gary Locke

Match Play

Penelope Cruz

Mickey Rourke

AR Rahman

Danny Boyle

Hugh Jackman

	Spin Lattice Relaxation Time (T1)
		The relaxation process is induced by field fluctuation due to molecular motion.
		This relaxation mechanism is particularly important for molecules containing protons (high natural abundance nuclei equipped with a large magnetogyric ratio).
		CSA is an important relaxation mechanism for nuclei with large chemical shift scale as for example on Phosphorus-31 and on Cadmium-113.
	www.chem.queensu.ca /FACILITIES/NMR/nmr/webcourse/t1.htm (743 words)

	Relaxation time - Wikipedia, the free encyclopedia
		Relaxation time is a general physics concept for the characteristic time in which a system relaxes under certain changes in external conditions.
		The relaxation time is related to the velocity of a body (typically a star) and the perturbation rate.
		The relaxation time is similar to the ratio of the velocity to the time derivative of the perturbation.
	en.wikipedia.org /wiki/Relaxation_time (197 words)

	Biomolecular NMR Facility - Measurement of 15N T2 relaxation time (Site not responding. Last check: 2007-11-01)
		Relaxation is a summation of processes by which magnetization decays over time, thus limiting the useful time of observation after exciting with an RF pulse.
		Because each nucleus has a characteristic relaxation time that governs loss of signal while at that nucleus, the relaxation times have to be long enough to allow the pulse sequences to complete and generate a useful signal.
		N relaxation time are understood and can be related to the overall rotational correlation time of the protein (tumbling rate), as well as a component due to internal flexibility of individual segments of the polypetide chain.
	instinct.v24.uthscsa.edu /~nmrref/t2n15v1214.shtml (2027 words)

	Dielectric Relaxation Time, a Non-linear Function of Solvent Viscosity by M D Magee. (Site not responding. Last check: 2007-11-01)
		Overall, macroscopic viscosity is discredited as a pointer to the behaviour of relaxation times.
		Under certain conditions, the separate relaxation regions of the components of a binary mixture of polar liquids coalesce into a single region, even when the separate relaxation times are sufficiently far apart to yield bimodal absorption The tentative explanation is that the volume undergoing relaxation contains at least four, and perhaps many more molecules.
		When the relaxing region is sufficiently large that its composition is that of the bulk liquid, then a single absorption is obtained, otherwise separate relaxation peaks occur.
	www.askwhy.co.uk /science/RelaxationTime.html (813 words)

	2.2 Globular cluster structure (Site not responding. Last check: 2007-11-01)
		The crossing time is the typical time required for a star in the cluster to travel the characteristic size R of the cluster (typically taken to be the half-mass radius).
		The relaxation time is the typical time for gravitational interactions with other stars in the cluster to remove the history of a star's original velocity.
		Since the relaxation time is related to the number and strength of the gravitational encounters of a typical cluster star, it is related to the number of stars in the cluster and the average energy of the stars in the cluster.
	www.maths.tcd.ie /EMIS/journals/LRG/Articles/Volume5/2002-2benacquista/node4.html (686 words)

	Relaxation-Related MRI Contrast
		Relaxation refers to the process to allow for the spin population to return to equilibrium.
		The spin-lattice relaxation time, T1, is in essence the time taken by the hydrogen protons, following a RF perturbation, to align themselves with the applied magnetic field.
		The time for the spins to become out of phase with each other is measured in T2 and is affected by the magnetic fluctuations as well as local magnetic environment whose magnetic state lifetime is uncertain.
	www.geocities.com /drkestrel/MediComp/mri/relaxationcontrast.html (576 words)

	Jackson et al. 1991 (Site not responding. Last check: 2007-11-01)
		The relaxation time for this slow phase was found to be a function of the starting PFD value.
		Relaxation time was relatively insensitive to starting PFD values below or above this transition value.
		The relaxation time for the increase in the contribution of slow phase was determined to be 10.1 minutes.
	www.biology.duke.edu /jackson/PlantP91.htm (269 words)

	NMR Diffusion and Relaxation Time Studies of HEUR Associating Polymer Binding to Polystyrene Latex (Site not responding. Last check: 2007-11-01)
		NMR Diffusion and Relaxation Time Studies of HEUR Associating Polymer Binding to Polystyrene Latex
		Binding of a HEUR (hydrophobic ethoxylated urethane) associating polymer (AP) (MW 51 000, C16 hydrophobic end caps) to polystyrene latex (diameter 168 nm) was investigated by a combination of NMR diffusion, relaxation time, and adsorption measurements.
		H NMR using a depletion method and could be described by a Langmuir isotherm.
	pubs.acs.org /cgi-bin/abstract.cgi/mamobx/1996/29/i01/abs/ma950993z.html (220 words)

	[No title] (Site not responding. Last check: 2007-11-01)
		An NMR spectrometer was used to study relationship between NMR relaxation time and temperature, viscosity, diffusivity and gas/oil ratio of methane-hydrocarbon mixtures.
		The log mean relaxation times were plotted against viscosity/temperature and it was found that unlike stock tank oils, they do not depend linearly on viscosity/temperature on a log-log scale.
		The relationship between diffusion coefficients and relaxation times were studied, and it was found that diffusion coefficients depend linearly on T1 for pure hydrocarbons, but the dependence does not hold for methane-hydrocarbon mixtures.
	www.ench.umd.edu /seminars/abstracts/abs2-1-00.txt (385 words)

	Beyond the Basics: Time Affects Stress Relaxation (Site not responding. Last check: 2007-11-01)
		The total amount of stress relaxation that occurred is the same as would have occurred had the original deflection been maintained for the summation of the two times stressed.
		For a contact spring that experiences a stress relaxation of 30% in 5 years, that same loss occurs in 15 years when the contact is only stressed 1/3 of the time.
		Thus, for stress relaxation purposes, the critical time in contact design is the total time under load (not necessarily the design life of the connector).
	www.connector.org /timestress03.html (380 words)

	The Tom Bearden Website
		During the relaxation time, we extract from the source only a flow of VPF, which is continually replaced in the source by the vacuum's violent VPF exchange with the source's bipolarity charges.
		Relaxation Time: The time it takes for the free electrons in a conductor (or material) to reach the skin of the wire after potential is applied, is, of course, called the relaxation time.
		In any given time interval, the energy taken (scattered) from the system as external work cannot exceed the sum of the unscattered trapped energy that was in the system initially and the unscattered energy that flowed into the system during that time interval.
	www.cheniere.org /techpapers/Final%20Secret%209%20Feb%201993/indexold.html (12210 words)

	Hairfacts: van Gemert, 1996 (thermal relaxation time)
		The result is a double integral over the coupled distributions of the two time constants to compute the temperature rise as a function of time and of axial and radial positions.
		The distribution of axial time constants is a homogeneous slowly decreasing function of spatial frequency (v) indicating that one single axial time constant cannot reasonably characterize axial heat conduction.
		The distribution of radial time constants is a function centred around a distinguished maximum in the spatial frequency (lambda) close to the single radial time constant value used previously.
	www.hairfacts.com /medpubs/lasergen/vangemert.html (420 words)

	Appendix 8: Relaxation Time and Singular Dynamic Scaling (Site not responding. Last check: 2007-11-01)
		Relaxation rates may be measured by changing the temperature or some other parameter, and then monitoring the rate at which a system relaxes toward equilibrium.
		At the critical temperature various properties (e.g., magnetic susceptibility) are found to vary as a power of the difference of the temperature from the critical temperature, so that these properties diverge or vanish at the critical point.
		The exponent which describes the behaviour of the relaxation time in the vicinity of the critical temperature is called "the dynamic critical exponent".
	www.hermetic.ch /compsci/thesis/app8.htm (680 words)

	Dr. Herbst's Basic MRI -- Lecture3 (Site not responding. Last check: 2007-11-01)
		T1 Relaxation Time (also called longitudinal relaxation time, or spin-lattice relaxation time)--T1 is a "time constant" that describes the rate at which Mz returns to M0.
		T2 Relaxation Time (also called transverse relaxation time, or spin-spin relaxation time)--T2 is a "time constant" that describes the rate at which the net magnetization vector decays in the xy (transvers) plane due to dephasing from spin-spin interactions.
		The relaxation time T2* is shorter than T2 because of the spins dephasing after the 90-degree flip.
	members.aol.com /mdherbst/mri/Lecture3.htm (626 words)

	Sequential changes in MR water proton relaxation time detect the process of rat brain myelination during maturation. (Site not responding. Last check: 2007-11-01)
		Changes in relaxation time (water proton longitudinal relaxation time by the inversion recovery, and water proton transverse relaxation time by the spin echo and the Carr-Purcell-Meiboom-Gill pulse sequence (CPMG)) and water content were then determined for various stages of brain development.
		During maturation both water proton longitudinal relaxation time and water proton transverse relaxation time values decreased and this finding paralleled the decline in water content.
		Water proton relaxation time, which can be estimated using the CPMG pulse sequence, showed a close correlation with myelination in the central nervous system.
	www.arclab.org /medlineupdates/abstract_11438119.html (230 words)

	Relaxation Time (Site not responding. Last check: 2007-11-01)
		The effects of creatine supplementation on muscle isometric torque generation and relaxation was investigated in health male volunteers.
		Contraction time for both the placebo group and creatine group were the same however, the resting time was consistently shortened by 20% after creatine ingestion.
		Relaxation rate in human skeletal muscles is determined by cross-bridging detachment and the decay of cytoplasmic Ca++ by sarcoplasmic Ca++ ATPase activity are the major determinants of human skeletal relaxation rates.
	pirate.shu.edu /~malikadn/relaxationtime.htm (265 words)

	[No title] (Site not responding. Last check: 2007-11-01)
		T1 thus has the dimensions of time and is called the spin lattice relaxation time.
		It is a measure of the time taken for the sample to reach thermal equilibrium by transferring energy from the spin system to other degrees of freedom such as molecular motion.
		For T2 relaxation, we have said that it is necessary to change the difference between the two energy levels, i.e.
	www.theochem.uni-duisburg.de /PC/NMR/Theory/relaxati.doc (2027 words)

	Relaxation (Site not responding. Last check: 2007-11-01)
		The download music relaxation is relaxation quote, relaxation technique child (guitar panic tab widespread) deep relaxation.
		The stress relaxation technique, also known as visualization relaxation (panic wear) download free music relaxation is focused on equipment relaxation and progressive relaxation.
		This website has information on benefit relaxation cannot be psychologist psychology relaxation cannot be breathing relaxation technique, calgary massage relaxation (wallpaper zen) guerir relaxation both help learn relaxation Relaxation natural relaxation remedy.
	www.zazentherapy.com /Zazen/relaxation.html (277 words)

	Electric Conductor Relaxation Time (Site not responding. Last check: 2007-11-01)
		The relaxation time is the time, for which the charge density...
		with the electrostatic relaxation time at altitudes of...
		Relaxation Time - The time for a variable (strictly, an exponential variable) or...
	www.insearchof-cures.com /stress-cures/electric-conductor-relaxation-time.php (607 words)

	Relaxation Time (Site not responding. Last check: 2007-11-01)
		The relaxation time is related to the conductivity,
		The thick solid line is a best estimate of the relaxation time profile which would exist just prior to sprite initiation by a conventional breakdown mechanism at
		The total conductivity profiles in Figure 2.5 were used to determine the corresponding relaxation times in Figure 2.6.
	nis-www.lanl.gov /~stanleym/dissertation/node25.html (150 words)

	Findings conclude sustained caffeine intake negates the benefits of creatine supplements
		This shortened time, coupled with a creatine loaded muscle facilitates calcium absorption into the sarcoplasmic reticulum (the endoplasmic reticulum of skeletal and cardiac muscle).
		This has lead a research team from Belgium to suggest that the combined effects of creatine and caffeine supplementation may be counterproductive to creatine’s effect on muscle relaxation time.
		The authors of the study, "Opposite Actions of Caffeine and Creatine on Muscle Relaxation Time in Humans" are P. Hespel, B. Op 'T Eijnde, and M. Van Leemputte, all from the Department of Kinesiology, Katholieke Universiteit Leuven, Leuven, Belgium.
	www.eurekalert.org /pub_releases/2002-03/aps-fcs031402.php (773 words)

	Relaxation (Site not responding. Last check: 2007-11-01)
		Macroscopically, T1 relaxation is characterized by the longitudinal return of the net magnetization to its ground state of maximum length in the direction of the main magnetic field.
		The T1 relaxation time is the time for the magnetization to return to 63% of its original length.
		T1 relaxation is fastest when the motion of the nucleus (rotations and translations or "tumbling rate") matches that of the Larmor frequency.
	www.mritutor.org /mritutor/relax.htm (216 words)

	PASPS III Conference: Conference Session
		The relaxation time, tau, can be determined from the exponential decay of n_t, an average number of tunneling electrons per one pulse cycle, as a function of wait time, t_h, during which an electron is allowed to relax from the excited state to the ground state.
		We are able to curve-fit this Gamma dependence of tau by 1/tau=1/tau_so+1/tau_cot, where tau_so is the Gamma?independent spin-orbit relaxation time and tau_cot is the cotunneling relaxation time which is inversely proportional to Gamma^2.
		The above experimental finding that the relaxation is actually described by two exponential components is consistent with the relaxation by spin-orbit interaction; faster component corresponds to allowed transition (S_Z =+1 and -1) and slower one corresponds to forbidden transition (S_Z =0) slowly decaying by suppressed cotunneling.
	www.sainc.com /pasps3/agendaConferenceView.asp?paperID=35 (435 words)

	Transient Postseismic Relaxation With Burger's Body Viscoelasticity
		To model the difference in short and long time decay rates, the Maxwell element is sometimes modified to have a non-linear rheology, which results in a lower effective viscosity immediately after the rupture, evolving to a higher effective viscosity as the co-seismic stresses relax.
		Both a short-term transient response and long-term steady creep are exhibited by a Burger's body, a Maxwell element (a spring in series with a viscous dash-pot) in series with a Voigt element (a spring in parallel with a viscous dash-pot).
		Whereas, for a Maxwell rheology, the initial relaxation time is given by $\tau = \eta_{\mathrm{Maxwell}}/G_{\mathrm{Maxwell}}$.
	www.agu.org /cgi-bin/SFgate/SFgate?language=English&verbose=0&listenv=table&application=fm02&convert=&converthl=&refinequery=&formintern=&formextern=&transquery=hetland&_lines=&multiple=0&descriptor=%2fdata%2fepubs%2fwais%2findexes%2ffm02%2ffm02%7c645%7c4295%7cTransient%20Postseismic%20Relaxation%20With%20Burger%27s%20Body%20Viscoelasticity%7cHTML%7clocalhost:0%7c%2fdata%2fepubs%2fwais%2findexes%2ffm02%2ffm02%7c6527984%206532279%20%2fdata2%2fepubs%2fwais%2fdata%2ffm02%2ffm02.txt (467 words)

	Incompressible limits of lattice Boltzmann equations using multiple relaxation times (Site not responding. Last check: 2007-11-01)
		The additional relaxation times may be adjusted to suppress non-hydrodynamic modes that do not appear directly in the continuum equations, but may contribute to instabilities on the grid scale.
		If these relaxation times are fixed in lattice units, as in previous work, solutions computed on a given lattice are found to diverge in the incompressible (small Mach number) limit.
		An incompressible limit does exist if the non-hydrodynamic relaxation times are not fixed, but scaled by the Mach number in the same way as the hydrodynamic relaxation time that determines the viscosity.
	www.ma.ic.ac.uk /~pdellar/incompLB.html (367 words)

	Selective Modification of NMR Relaxation Time in Human Colorectal Carcinoma by Using gadolinium{middle dot} ...
		Selective Modification of NMR Relaxation Time in Human Colorectal Carcinoma by Using gadolinium{middle dot} diethylenetriaminepentaacetic Acid Conjugated with Monoclonal Antibody 19-9 -- Curtet et al.
		relaxation of water protons at 90 MHz in direct proportion to the gadolinium concentration, and this effect was greater than in Gd· DTPA solutions.
		relaxation time at 90 MHz, measured in tumors removed from nude mice 24 hr after injection of Gd· DTPA-mAb 19-9 (Gd, 20 µ mol/kg; 16 DTPA molecules per mAb molecule), was significantly decreased (by 15%) as compared with the control group.
	www.pnas.org /cgi/content/abstract/83/12/4277 (321 words)

	Role of protein phosphatases in regulation of cardiac inotropy and relaxation -- Bokník et al. 280 (2): 786 -- ...
		of time to peak tension was measured at 10%, and the endpoint
		We then investigated the time course of cantharidin effects on force of contraction, relaxation time, and protein phosphorylation.
		A shortening of relaxation time accompanied the increase in the
	ajpheart.physiology.org /cgi/content/full/280/2/H786 (4459 words)

Try your search on: Qwika (all wikis)