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891.
Mössbauer spectra of La1–x
Ba
x
FeO3–y
recorded at room temperature for various values of x show a six-line and/or a single-line subspectrum. The six-line subspectrum with IS=0.41 mm/s and H=52 T results from an orthorhombic perovskite containing only Fe3+ ions. The single-line subspectrum at 0.17 mm/s from a cubic perovskite can be assigned to neither Fe3+ nor Fe4+ but to an intermediate valence state, which may be due to electron hopping between the Fe3+ and Fe4+ ions on the identical octahedral sites. The temperature dependence of electron hopping in the compound La0.40Ba0.60FeO3–y
is presented. 相似文献
892.
利用高分辨电子显微学方法(HREM)研究了纳米氧化层镜面反射自旋阀多层结构Ta(35nm)Ni80Fe20(2nm)Ir17Mn83(6nm)Co90Fe10(15nm)NOL1Co90Fe10(2nm)Cu(22nm)Co90Fe10(15nm)NOL2Ta(3nm).该自旋阀的巨磁电阻(GMR)效应高达15%,较无此镜面反射纳米氧化层(NOL)的自旋阀提高近1倍,同时交换偏置场亦有所增强.高分辨显微结构分析表明,介于钉扎层与被钉扎层之间的氧化层(NOL1)并未完全氧化,即除氧化过程生成的CoFe氧化物
关键词:
自旋阀
纳米氧化层
高分辨电子显微学
巨磁电阻效应 相似文献
893.
Fuzzy reliability theories 总被引:2,自引:0,他引:2
Cai Kai-Yuan 《Fuzzy Sets and Systems》1991,40(3):510-511
894.
Xing Cai Bjørn Fredrik Nielsen Aslak Tveito 《Numerical Linear Algebra with Applications》2007,14(5):459-467
We discuss the efficiency of the conjugate gradient (CG) method for solving a sequence of linear systems; Aun+1 = un, where A is assumed to be sparse, symmetric, and positive definite. We show that under certain conditions the Krylov subspace, which is generated when solving the first linear system Au1 = u0, contains the solutions {un} for subsequent time steps. The solutions of these equations can therefore be computed by a straightforward projection of the right‐hand side onto the already computed Krylov subspace. Our theoretical considerations are illustrated by numerical experiments that compare this method with the order‐optimal scheme obtained by applying the multigrid method as a preconditioner for the CG‐method at each time step. Copyright © 2007 John Wiley & Sons, Ltd. 相似文献
895.
896.
Based on liquid variational perturbation theory with quantum mechanics correction, the effective exp-6 potential is adopted
to compute the shock Hugoniot of liquid H2 + D2 mixtures at different molar rations. An examination of the confidence of the above computation is performed by comparing
experiments and calculations, in which similar calculation procedure used for H2 + D2 is adopted for H2 and D2 each, since no experimental data are available to conduct this kind of comparison. Good agreement in both comparisons is
found. This fact may look as if an indirect positive verification of calculation procedure was used here at least in the pressure
and temperature domain covered by the experimental data of H2 and D2 used for comparison, numerically nearly up to 20 GPa and 104 K.
Project supported by the Science and Technology Foundation of China Academy of Engineering Physics (Grant No. 97Z011). 相似文献
897.
本文通过引入压缩映象集序列的概念,推广并综合了张石生以及V.M.Sehger和A.T.Bharucha-Reid中某些主要定理的结果。 相似文献
898.
Photonic band structures of two-dimensional photonic crystals with deformed lattices 总被引:2,自引:0,他引:2
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Using the plane-wave expansion method, we have calculated and analysed the
changes of photonic band structures arising from two kinds of deformed
lattices, including the stretching and shrinking of lattices. The square
lattice with square air holes and the triangular lattice with circular air
holes are both studied. Calculated results show that the change of lattice
size in some special ranges can enlarge the band gap, which depends strongly
on the filling factor of air holes in photonic crystals; and besides, the
asymmetric band edges will appear with the broken symmetry of lattices. 相似文献
899.
Zhijun Chen Jie Cai Leyang Zhang Yun Liu Xiqun Jiang Changzheng Yang 《Journal of Polymer Science.Polymer Physics》2005,43(11):1332-1343
Copolymers of styrene and 4‐vinylpyridine with a styrene fraction f varying from 1 to 0 were grafted onto a silicon substrate in the melt. The grafting reaction and the stability of the grafted chains were investigated by Fourier transform infrared and X‐ray photoelectron spectroscopy. The thickness and surface morphology of the grafted copolymer layers were characterized with ellipsometry and atomic force microscopy (AFM). The copolymer chains were successfully grafted to the surface of the silicon substrate by a reaction between the hydroxyl groups of the nitroxide moiety at the end of the copolymers and the silanol groups on the surface of the silicon wafer. A measurement of the thickness of the grafted copolymer layers showed that the ratio of grafted‐layer thickness to the unperturbed chain radius of gyration decreased with the increasing fraction of 4‐vinylpyridine in the copolymer; this indicated that the grafted layer was strongly attracted to the substrate. In addition, an accelerated grafting process was observed at grafting times ranging from 48 to 72 h for pure poly(4‐vinylpyridine) and copolymers with f values of 0.3 and 0.5. AFM observation revealed that the grafted layers densely and homogeneously covered the silicon substrate. © 2005 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 43: 1332‐1343, 2005 相似文献
900.
妊娠晚期羊水中微量元素测定及其与胎儿生长发育关系的研究 总被引:1,自引:0,他引:1
对102名足月正常妊娠第一胎的产妇妊娠晚期羊水中6种微量元素(锌、铜、锰、铁、钙、镁)首次进行了测定,并通过对出生新生儿生长发育的监测探讨其与胎儿生长发育的关系。妊娠晚期羊水中6种微量元素含量(±S/×10-5)分别为:Zn2.29±1.77,Cu0.14±0.14,Mn0.13±0.23,Fe3.69±2.70,Ca82.54±74.18,Mg18.71±11.09.男女新生儿其母羊水中微量元素含量比较无显著差异,P≥0.05.与文献报道中期妊娠羊水中所含微量元素比较有增加趋势.6种微量元素相互关系中.与锌、钙呈正相关外,锌与铜、锰、铁、镁呈负相关.低体重组与低身长组新生儿孕母羊水中锌含量明显低于高体重组和高身长组,有显著差异,P≤0.01.铁在高身长组含量增高,与低身长组比较有显著差异,P≤0.05.锰于低体重组含量升高,与高体重组比较有显著差异,P≤0.01.镁与铜于低身长组含量升高,与高身长组比较有显著差异,P分别≤0.05与0.01.可见高铜、高锰、高镁可致胎儿生长发育迟缓. 相似文献