Comparison Of Spin Research Articles

Discovery of collective states in 208Pb by complete spectroscopy

Most neutron and proton bound states in 208Pb are described in the shell model as one-particle onehole configurations. Besides precise data obtained with the Q3D magnetic spectrograph of the MLL (Garching, Germany) an important reaction is the inelastic proton scattering via isobaric analog resonances in 209Bi. It yields amplitudes of neutron one-particle one-hole configurations with relative signs in each stateof 208Pb. The orthogonality, normality, and sum rule relations allow to investigate the completeness of the transformation matrices of one-particle one-hole configurations describing the states in 208Pb with spins from 0− to 14− and 0+ to 12+. By this method amplitudes of unobservable one-particle one-hole configurations can be determined.The comparison of spin, parity, and dominant particle-hole components thus derived in up to 30 states of a certain spin to shell model calculations allows to identify states described as collective excitations of the entire nucleus.

Comparison of Spin and Blade Coating Methods in Solution-process for Organic Light-emitting Devices

Comparison of Spin and Blade Coating Methods in Solution-process for Organic Light-emitting Devices

Comparison of spin and electron diffusion coefficients in a two-dimensional electron gas

The results from femtosecond four-wave-mixing experiments carried out in two-dimensional gas at the GaAs/AlGaAs heterojunction boundary under room temperature conditionsare presented. The obtained values of the spin and electron diffusion coefficients are 163.2 and 200 cm2/s respectively. The spin and electron relaxation times are found to be 50.7 ps and 3 ns respectively.

Comparison of SPIN and VIS for protocol verification

In this paper, we compare and contrast SPIN and VIS, two widely used formal verification tools. In particular, we devote special attention to the efficiency of these tools for the verification of communications protocols that can be implemented either in software or hardware. As a basis of our comparison, we formally describe and verify the Asynchronous Transfer Mode Ring (ATMR) medium access protocol using SPIN and its hardware model using VIS. We believe that this study is of particular interest as more and more protocols, like ATM protocols, are implemented in hardware to match high-speed requirements.

NMR imaging of elastomeric materials

Abstract : NMR imaging has been applied to elastomeric materials of industrial and military interest The T2 spin-spin relaxation times of common elastomers, particularly after filling and curing, are sufficiently short that spin-echo sequences at submillisecond echo times cannot produce T2-independent images. The sensitivity to T2 makes spin echo imaging a good probe of elastomer blend composition, as demonstrated for a series of filled, cured cis-polybutadiene, styrene-butadiene rubber blends. The technique can distinguish good and bad carbon black dispersion in actual tire tread samples. The configuration of non- metallic tire cord, voids, rubber layer boundaries, apparent migration of additives, and other inhomogeneities can be detected in end-product tire samples. Arrowhead patterns, arising from magnetic susceptibility differences for defects in carbon-black-filled elastomers, were attributed to graphitized 'coke' particles from the carbon black. NMR images were obtained for porous glass disks of different porosities as models of materials such as oil cores. The mottled appearance often seen for such images is attributed largely to insufficient signal-to-noise ratio, and not pore structures. Comparison of spin- echo and gradient-echo images demonstrates the defect-magnification effect of the gradient-echo sequence seen previously for elastomers. The advantages of volume imaging, isotropic voxels in thin slices, and higher resolution are demonstrated for porous materials. defects, composites, spin echo, lithium-7, fluorine-19, carbon nuclear magnetic resonance, imaging, elastomers, tires, black, Interfaces, curing, filler, NMR imaging, relaxation coke.

Universal configurational structure in two-dimensional scalar models

Monte Carlo methods are used to explore the universal configurational structure of two-dimensional spin- 1/2, spin-1 and border- phi 4 models. Comparison of spin- 1/2 and spin-1 data provides evidence that the magnetisation distribution (effectively the Helmholtz free-energy function) and its coupling derivative (effectively the internal-energy function) constitute readily accessible signatures of a universality class. It is shown that, when allowance is made for relatively large corrections-to-scaling effects, the behaviour of the border- phi 4 model may be satisfactorily matched to that of the other two models, substantiating the view that the border model does indeed belong to the Ising universality class.

Structural study on the active site of porcine pepsin and Rhizopus chinensis acid protease. Spin labeling with diazoketone reagents.

To investigate the active site structures of porcine pepsin and Rhizopus chinensis acid protease (RAP), spin label techniques were applied for these enzymes. Comparison of spin labeled porcine pepsin and RAP suggested that the active site cleft of porcine pepsin was narrower at the top, but wider at the bottom than that of RAP. Addition of pepstatin restricted the motion of the labeled nitroxide radicals. Under alkaline conditions, the enzymes changed their conformation discontinuously and irreversibly to open the active site clefts and to lose the binding ability for pepstatin. The denaturation points of both the enzymes were determined to be pH 6.2.

Determination of the first Landau spin parameter (B0) in lithium via transmission spin resonance

Analyses of transmission-electron-spin-resonance data are presented which yield quantitative information regarding the first Landau spin parameter ${B}_{0}$ in sodium and lithium in the regime where resolved spin waves are not observable. At low temperatures ${B}_{0}$ is obtained from an analysis of line-shape asymmetries. At higher temperatures ${B}_{0}$ is deduced by a comparison of spin and momentum diffusion constants. The value of ${B}_{0}$ for sodium is consistent with that obtained from spin waves and provides verification of the new methods described. ${B}_{0}$ obtained for lithium is used to calculate the electronic susceptibility which is compared with other experimental and theoretical results.