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991.
992.
Ag-impurity effects on the first- and second-order quadrupole interaction (QI) at 23Na site in an isomorphic mixed system, Na1−xAgxNO2 (x=0, 0.0084, 0.026, 0.079, 0.094, 0.16), have been investigated by employing 23Na (I=3/2) magic angle spinning nuclear magnetic resonance (MAS NMR) technique. The central transition (CT) and satellite transition (ST) are simultaneously observed with this system. From the spectral analysis, the quadrupole parameter and its distribution width are obtained as a function of Ag concentration. From the intensity loss of CT MAS centerband and of the envelope function of ST MAS sidebands due to impurities, the range of their influence on the second- and first-order QI is estimated. The estimated ranges contain the second and first neighbouring Na sites from the resonating 23Na nucleus for the first- and second-order QI, respectively. 相似文献
993.
Maciej Garbarczyk Farida Grinberg Nikolaus Nestle Winfried Kuhn 《Journal of Polymer Science.Polymer Physics》2001,39(18):2207-2216
We present a novel NMR approach to the determination of crosslink densities in rubber materials. The method is based on the dipolar correlation effect (DCE) on the stimulated echo examined in a series of rubber samples and linear polyisoprene. The parameter evaluated from the echo attenuation curves is the mean‐squared dipolar fluctuation associated with anisotropic reorientations of macromolecular backbones. The contributions to the DCE of the constraints due to excluded volume effects and chemical crosslinks are estimated. A strong dependence of the mean‐squared dipolar fluctuation on the crosslink density of rubber combined with the simplicity of performing the measurements with inexpensive low‐field instruments suggests that the DCE is a useful tool for routine applications. The potential and problems of performing DCE measurements in low‐magnetic‐field conditions are discussed in detail. © 2001 John Wiley & Sons, Inc. J Polym Sci Part B: Polym Phys 39: 2207–2216, 2001 相似文献
994.
S. Raymond J. Flouquet R. Calemczuk L. P. Regnault B. Fk P. Haen S. Kambe P. Lejay T. Fukuhara 《Physica B: Condensed Matter》2000,280(1-4):354-355
Results of neutron scattering and specific heat measurements are reported for two kinds of weak antiferromagnetic compounds corresponding to (i) the situation at the quantum critical point and (ii) the double magnetic transition observed in CeRu2Ge2. 相似文献
995.
Yuhiro Iwamoto Hiroshi Yamaguchi Xiao-Dong Niu 《Journal of magnetism and magnetic materials》2011,323(10):1378-1383
The magnetic body force in boiling two-phase temperature-sensitive magnetic fluid (TSMF) flow is known to effectively increase the driving force of magnetic fluid in a non-uniform magnetic field. Based on this mechanism, in the present study, a binary TSMF, which is a mixture of the TSMF and a low-boiling-saturation-temperature organic solution, is proposed to be used in a heat transport device to enhance its circulation. In order to see its performance in the heat transport device, the pressure difference at different heated temperatures, magnetic fields and inclination angles of the heating section are investigated experimentally and theoretically. Results showed that the driving force increases remarkably due to more gas phase appearing in the test fluid and the magnetization of it decreasing. At low magnetic field the driving force is enhanced greatly when the inclination angle is close to 60°, while at high magnetic field the driving force is remarkably enhanced due to the effect of the magnetic force in the inclination angle range from 0° to 30° and 60° to 90°. 相似文献
996.
介绍了量子计算机的最新发展状况。对实现量子计算机的各种实验方法作了简介和比较。特别是详细介绍了最近Kane提出的一种方案,并提出了一种新的用扫描隧道显微镜实现基于单原子的量子计算机方案。 相似文献
997.
998.
B. Basu 《Physics letters. A》2010,374(10):1205-4824
The geometric phase associated with a many body ground state exhibits a signature of quantum phase transition. In this context, we have studied the behavior of the geometric phase during a linear quench caused by a gradual turning off of the magnetic field interacting with a spin chain. 相似文献
999.
The theoretical predictions that UGa3 and CeFe2 should be regarded as itinerant magnets stimulated new investigations. In this paper we focus on Mössbauer measurements aimed to characterize their magnetic properties. We show that the analysis of the transferred hyperfine interactions at the 119Sn nuclei in U(Ga0.98Sn0.02)3, a type II antiferromagnet, provides direct information on the f-p hybridization and allows to determine the orientation of the U moments. The study of CeFe2 demonstrates that the intrinsic ferromagnetism coexists with short range antiferromagnetic correlations. The instability of the ferromagnetic state is illustrated by doping CeFe2 with a small amount of Co and by application of pressure on pure CeFe2. Our results will be discussed in connection with neutron and synchrotron experiments. 相似文献
1000.
Luke J. Batchelor Emma Fitzgerald Dr. Joanna Wolowska Dr. Joseph J. W. McDouall Prof. Eric J. L. McInnes 《Chemistry (Weinheim an der Bergstrasse, Germany)》2010,16(36):11082-11088
The synthesis, structural and magnetic characterisation of [VIII3O(tmme)2(diimine)2Cl] [diimine=2,2′‐bipyridine ( 1 ) or 1,10‐phenanthroline ( 2 )] and (HNEt3)2[VIII4O(tmme)4] ( 3 ) is reported, in which H3tmme is tris(mercaptomethyl)ethane, MeC(CH2SH)3, the thiol analogue of the famous tripodal alcohol ligands typified by H3thme [tris(hydroxymethyl)ethane, MeC(CH2OH)3]. Complexes 1 and 3 have “T‐shaped” and square topologies, respectively, and the latter is centred on a rare example of a square‐planar oxide. The tri‐thiolate ligands bind the periphery of the clusters and provide such strong antiferromagnetic exchange pathways that in both cases only a single total spin state is occupied up to room temperature, in the absence of metal–metal bonding. Magnetic data, electronic structure calculations and electrochemical data are reported. 相似文献