Fe-Al2O3颗粒膜的隧道巨磁电阻效应

对射频共溅射法制备的ＦｅＡｌ２Ｏ３颗粒膜的隧道巨磁电阻效应进行了研究．当Ｆｅ体积百分比为４５％时,样品的室温磁电阻的变化率（ＭＲ）在１Ｔ的平行膜面的磁场下可达４４％．磁测量表明在室温时样品呈超顺磁态．另外,从ＭＲ随温度的变化关系曲线可以看出,当温度低于５０Ｋ时,ＭＲ随着温度的下降而显著增加,ＭＲ在２０Ｋ时达到１４９％,４２Ｋ时可达２６％,大大超过理论的预期值,这可能与低温下由库仑抑制效应引起的自旋相关隧穿的高阶效应有关．     

R_2Fe_17稀土三元碳化物的磁学与结晶学性质

Ｒ＿２Ｆｅ＿１７稀土三元碳化物的磁学与结晶学性质钟夏平Ｒ．Ｊ．Ｒａｄｗａｎｓｋｉ、Ｆ．Ｒ．ｄｅＢｏｅｒ、Ｔ．Ｈ．Ｊａｃｏｂｓ、Ｋ．Ｈ．Ｊ．Ｂｕｓｃｈｏｗ（荷兰阿姆斯特丹大学物理实验室）（荷兰菲利浦研究实验室）本刊编者按本文原作发表于荷兰《磁学与磁性材...     

ELECTRON MOMENTUM SPECTRA OF EXCITED He(2~1S) AND He(2~3S)

ＥＬＥＣＴＲＯＮＭＯＭＥＮＴＵＭＳＰＥＣＴＲＡＯＦＥＸＣＩＴＥＤＨｅ（２１Ｓ）ＡＮＤＨｅ（２３Ｓ）ＣｈｅｎＺｈａｎｇｊｉｎＳｈｉＱｉｃｕｎＣｈｅｎＪｉＸｕＫｅｚｕｎＤｅｐａｒｔｍｅｎｔｏｆＭｏｄｅｒｎＰｈｙｓｉｃｓ，ＵｎｉｖｅｒｓｉｔｙｏｆＳｃｉｅｎ...     

书评

书评ＡＩＰＨＡＮＤＢＯＯＫＯＦＣＯＮＤＥＮＳＥＲＭＩＣＲＯＰＨＯＮＥＳＴｈｅｏｒｘＣａｌｉｂｒａｔｉｏｎａｎｄＭｅａｓｕｒｅｍｅｎｔｓＧｅｅｒｇｅＳ．Ｋ．Ｗｏｎｇ，ＴＯｎｙＦ．Ｗ．Ｅｍｂｌｅｔｏｎ主编３２１＋ＸＶｌｌ页（ＡｍｅｒｉｃａｎＩｎｓｔｉｔｕ...     

类Be离子电子碰撞电离的速率系数计算

本文用Ｓａｍｐｓｏｍ等的“Ｚ－标度类氢模型和库仑玻恩交换近似”方法，修改了Ｓａｍｐｓｏｎ理论中关于屏蔽常数的定义，选用电子机轨道平均半径标准，使用多组态Ｈａｒｔｒｅｅ－Ｆｏｃｋ（ＭＣＨＦ）及多组态Ｄｉｒａｃ－Ｋｏｃｋ（ＭＣＤＦ）方法计算屏蔽常数，并给出了类Ｂｅ离子Ｃ＾２＾＋，Ｎ＾３＾＋，Ｏ＾４＾＋，Ｎｅ＾６＾＋及Ｆｅ＾２＾２＾＋的电离速率系统。从计算结果，可以看到高荷电靶离子的相对论效应。     

1.06μm区域的Cs2分子吸收光谱

用ＲＫＲ（Ｒｙｄｂｅｒｇ－Ｋｌｅｉｎｎ－Ｒｅｅｓ）方法计算了Ｃｓ２分子的Ｘ＾１∑ｇ和Ａ＾１∑ｕ的势能曲线，求解了Ｃｓ２分子核运动的径向薛定谔方程，获得Ｘ态与Ａ态间跃迁的Ｆｒａｎｃｋ－Ｃｏｎｄｏｎ因子和１．０６μｍ附近区域的吸收光谱，并与实验测得的吸收光谱作了比较，两者相当符合。     

H2O＋Cl→HCl＋OH反应中D同位素的动力学效应的理论研究

根据传统过渡态，变分过渡理论计算了Ｈ２Ｏ＋Ｃｌ→ＨＣｌ＋ＯＨ（Ｒ１）反应中Ｄ代替的同位素动力学效应（ＫＩＥ）得到了ＨＯＤ＋Ｃｌ→ＤＣｌ＋ＯＨ（Ｒ２），ＤＯＨ＋Ｃｌ→ＨＣｌ＋ＯＤ（Ｒ３）反应不同的ＫＩＥ值，对ＫＩＥ进行了分解，讨论了平动（ｔｒａｒｓ）转动（ｒｏｔ）振动（ｖｉｂ）等各种因素的作用，在反应Ｒ２中，由于ＨＯＤ中ＯＤ键直接参与反应，Ｄ同位素的ＫＥ很大，对Ｒ２的ＫＩＥ分解表明，振动对ＫＩＥ贡献     

介绍国际电工委员会第81技术委员会的工作

介绍国际电工委员会第８１技术委员会的工作林维勇（机械工业部设计研究院，北京１０００８１）（收稿日期：１９９８－０６－０１）ＩＮＴＲＯＤＵＣＩＮＧＷＯＲＫＯＦＩＥＣ┐ＴＣ８１ＬｉｎＷｅｉｙｏｎｇ（ＰｒｏｊｅｃｔＰｌａｎｎｉｎｇａｎｄＲｅｓｅａｒｃｈＩｎ...     

s—d系统的统一模型与稀磁合金低温杂质电阻的特性

本文基于ｓｄ混合效应与ｓｄ交换效应（包括ＲＫＫＹ关联效应）的统一模型，利用格林函数方法，研究了稀磁合金低温杂质电阻的特性，合理地解释了ｓｄ系统中，ｓｄ混合模型、ｓｄ交换模型及ＲＫＫＹ关联模型各单一的物理效应     

DEUTERIUM INFLUX PROFILE ALONG THE APEX OF THE UPPER X-POINT TILES IN JET

ＤＥＵＴＥＲＩＵＭＩＮＦＬＵＸＰＲＯＦＩＬＥＡＬＯＮＧＴＨＥＡＰＥＸＯＦＴＨＥＵＰＰＥＲＸ－ＰＯＩＮＴＴＩＬＥＳＩＮＪＥＴ￥Ｙ．Ｋ．Ｚｈｕ（ＳｏｕｔｈｗｅｓｔｅｒｎＩｎｓｔｉｔｕｔｅｏｆＰｈｙｓｉｃｓ，Ｐ．Ｏ．Ｂｏｘ４３２，Ｃｈｅｎｇｄｕ６１００４１...     

Heavy quark potentials and hybrid mesons from SU(3) lattice gauge theory

The potentials between heavy quarks are evaluated in SU(3) lattice guage theory using a combined variational and multihit technique. We present results for the ground state potential together with the first gluonic excited mode which is relevant to hybrid mesons.     

The Equations of Grand Unified Field Theory in Terms of the Maurer-Cartan Structure Relations of Differential Geometry

The first and second Maurer-Cartan structure relations are combined with the Evans field equation [1] for differential forms to build a grand unified field theory based on differential geometry. The tetrad or vielbein plays a central role in this theory, and all four fields currently thought to exist in nature can be described by the same equations, the tangent space index of the tetrad in general relativity being identified with the tetrad's internal (gauge group) index guage theory.     

非Abel对偶超导理论中的涡旋管研究

首次讨论了非Abel对偶超导理论中的涡旋管性质。 在Cho等工作的基础上进一步研究了非Abel情况下的动力学, 并推导出了哈密顿量和运动方程。 重点讨论了限制规范势对应的非Abel对偶超导理论性质, 并给出了D型及N型两类整数涡旋的具体数值解。 通过与传统的Abel对偶超导理论的对比分析,发现两者的运动方程形式及涡旋解基本一致, 这表明利用Abel对偶超导模型研究夸克色禁闭问题是合理的。 We have discussed vortices in the non Abelian dual superconductor theory. Based on the work of Cho et al., the Hamiltonian and the equations of motion of non Abelian model were discussed in details. The non Abelian dual superconductor theory related to the restricted guage potential was underlined and solutions of D type and N type integer vortices were obtained. Comparing with the traditional Abelian dual superconductor theory, we found that the the equations of motion and solutions of vortices in two models are almost same, which indicates it is reasonable to study quark confinement based on the Abelian dual superconductor theory.     

Electromagnetic field in a space with curvature — New solutions

A solution is obtained which can be regarded as a classical model of a changed particle having both a magnetic moment and nonzero magnetic charge density. It is noted that interaction with the curvature of space-time can not only disrupt the guage invariance of the electromagnetic field, but can also reestablish invariance in an initially noninvariant theory.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 2, pp. 30–33, February, 1982.     

THE PERTURBATION EXPANSION OF THE QUANTIZED COMPOSITE FIELD THEORY AND GAUGE INVARIANCE

In this paper we introduce the concept of "same order" in the perturbution expansion of the quatized composite field theory which is different from single particle theory. For example, in the case of Q. E. D., "same order" is defined by means of a coupling constant, but here it closely relates the operators occuring in the B. S. equations. Feymann graphs of the "same order" are defined for different kinds of transitions in the composite field theory. Finally, we prove that guage invariance is a natural result as long as all "same order" Feymann graphs are calculated for an electromagnetic transition between composite particles.     

同步球对称静态Yang-Mills 自对偶解和连续面分布的 ’tHooft-Polyakov磁单极

在本文中。我们得到了Yang-Mills规范场的全部同步球对称静态自对偶解。由此解我们进一步导出了磁荷连续面分布的结论。 关键词：     

Solitary wave solutions of nonlinear financial markets :data-modeling-concept-practicing

This paper seeks to solve the difficult nonlinear problem in financial markets on the complex system theory and the nonlinear dynamics principle, with the data-model-concept-practice issue-oriented reconstruction of the phase space by the high frequency trade data. In theory, we have achieved the differentiable manifold geometry configuration, discovered the Yang-Mills functional in financial markets, obtained a meaningful conserved quantity through corresponding space-time non-Abel localization gauge symmetry transformation, and derived the financial solitons, which shows that there is a strict symmetry between manifold fiber bundle and guage field in financial markets. In practical applications of financial markets, we have repeatedly carried out experimental tests in a fluctuant evolvement, directly simulating and validating the existence of solitons by researching the price fluctuations (society phenomena) using the same methods and criterion as in natural science and in actual trade to test the stock Guangzhou Proprietary and the futures Fuel Oil in China. The results demonstrate that the financial solitons discovered indicates that there is a kind of new substance and form of energy existing in financial trade markets, which likely indicates a new science paradigm in the economy and society domains beyond physics.      

Solitary wave solutions of nonlinear financial markets: data-modeling-concept-practicing

This paper seeks to solve the difficult nonlinear problem in financial markets on the complex system theory and the nonlinear dynamics principle, with the data-model-concept-practice issue-oriented reconstruction of the phase space by the high frequency trade data. In theory, we have achieved the differentiable manifold geometry configuration, discovered the Yang-Mills functional in financial markets, obtained a meaningful conserved quantity through corresponding space-time non-Abel localization gauge symmetry transformation, and derived the financial solitons, which shows that there is a strict symmetry between manifold fiber bundle and guage field in financial markets. In practical applications of financial markets, we have repeatedly carried out experimental tests in a fluctuant evolvement, directly simulating and validating the existence of solitons by researching the price fluctuations (society phenomena) using the same methods and criterion as in natural science and in actual trade to test the stock Guangzhou Proprietary and the futures Fuel Oil in China. The results demonstrate that the financial solitons discovered indicates that there is a kind of new substance and form of energy existing in financial trade markets, which likely indicates a new science paradigm in the economy and society domains beyond physics.     

Improved renormalization group equations with dimensional regularization and the ε expansions

Due to the absence of dimensional cut-off parameters in the dimensional regularization scheme, vanishing of the renormalized mass of the scalar boson implies vanishing of its renormalized mass; thus the masses of both bosons and fermions in renormalizable field theories can be made finite by multiplicative mass renormalizations. The improved renormalization group equations in D dimensions are derived in such a way that both the large (or the small) momentum limits and the Wilson ? expansions can be uniformly treated for the fermion as well as the boson cases. We discuss the improved equations for φ₆³ theory, φ₄⁴ theory, quantumelectrodynamics, massive vector-gluon model, and non-Abelian guage theories incorporating fermions. For the latter three classes of theories, the gauge dependent problem of the coefficient functions in the improved renormalization group equations is discussed.     

QGP有效微扰论中纯规范场的二圈热力学势

使用基于硬热圈(HTL)的重求和方法,计算了QGP中纯规范场的二圈热力学势及其重整化,得到了包含集体效应的结果.