TRANSVERSE TRANSPORT PROCESSES OF CHARGED PARTICLE SYSTEMS IN A STRONG MAGNETIC FIELD (I) Quantum Theory

The quantum theory of the transverse transport of charged particle systems in a strong, uniform magnetic field is reinvestigated in this article. All such previous theories, based on the Kubo formula in the Landau representation, only considered the second-order term of the collisional expansion series. However, if other high-order terms, especially the so-called reducible diagonal parts, are also considered, another second-order contribution is found, which exactly cancels the one derived prebiously. Hence, within the fxamwork of the usual theory, all the transverse transport coefficients would be identically zero. phis consequence is directly related to the local nature of the Landau eigen states.Only because previous calculations were incomplete did they obtain finite results.     

TRANSVERSE TRANSPORT PROCESSES OF CHARGED PARTICLE SYSTEMS IN A STRONG MAGNETIC FIELD (II) SOME DISCUSS IONS ABOUT THE BOLTZMANN EQUATION

In this article, it is pointed out that in a strong magnetic field the usual Boltzmann Equation with Lorentz force term is inconsistent with the fundamental requirements of the general theory of non-equilibrium statistical mechanics. Furthermore, if a collision term corresponding to particles in different gyroorbits is used, we find that all the transport coefficients are exactly zero.     

BARYONIUM[1] AND POSSIBLE SUPERSYMMETRY BETWEEN QUARKS AND ANTIDIQUARKS[2]

The possibility that diquark is a stable object in hadrons and there exists a global supersymmetry between quarks and antidiquarks is discussed. Mesons, baryons and baryoniums can be classified unitedly in the adjoint representation of the super-symmetry group. The united mass splitting formula is obtained based on the snpersymmetry and a naive physical mechanism for symmetry breaking. The mass spectra for baryonium ground states are obtained numerically and may be verified experimentally, Some significant characteristics of baryoniums are discussed and can be used as evident indications of the appearance of加ryoniums.     

用高能核子非弹性散射研究核力有效势

本文用扭曲波玻恩近似法及多体高能近似法,处理了原子核对高能核子的非弹性散射现象。在具有可靠的靶核激发态波函数的情况下,可利用这些理论处理方法研究核内两核子间的有效势,本文具体就碳核对185MeV入射核子的非弹性散射进行了计算。在计算中利用了粒子-空穴模型核波函数。在采用了具有各种交换性质并包含自旋轨道耦合项的有效势后,用一组合理的位阱参数,由多体高能近似法计算的理论值可与几个微分截面及极化实验曲线同时符合。     

离子交换树脂的制备及其性能测定——Ⅵ.高强度多孔性聚苯乙烯-二乙烯基苯型弱碱性阴离子交换树脂

首先用苯乙烯-二乙烯基苯一聚苯乙烯制成共聚体,测定这些产品在甲苯中的溶胀度、表观体积、表观密度及孔度占共聚体中的百分数。然后用下列方法:(1)共聚体经过氯甲基化后,以四次乙烯基五与之反应;(2)共聚体经过硝化后,再以氯化亚锡或多硫化钠,使之还原,得到两种弱碱性阴离子交换树脂。最后用碘甲烷将上述两种树脂季铵化,得到部分含强碱基的树脂。 从实验知道用上述共聚体制成的树脂,其交换容量、机械强度及引入交换基团的速率等均较用一般方法所得到的共聚体为高。     

四次乙基五胺-环氧氯丙烷阴离子交换树脂的交换速度的测定

本工作测定了四次乙基五胺-环氧氯丙烷阴离子交换树脂对酸的交换吸附速率,包括: 1.用不同配料比合成的树脂,对3,5-二硝基苯甲酸的交换吸附; 2.用一定配料比不同粒度的330对乙酸的交换吸附; 3.用一定配料比的330对数种酸(甲酸、乙酸、己酸、盐酸及3.5-二硝基苯甲酸)的交 换吸附; 4.弱碱330、叔胺化330、季铵化330及强碱201对3,5-二硝基苯甲酸的交换吸附; 5.数种弱碱330对3,5-二硝基苯甲酸的交换吸附。 本文还比较了两种测试交换吸附速度的方法:连续取样法及分批法.实验表明,当被交换吸附的酸浓度若维持在0.032N左右时两种方法所得到的曲线基本上是一致的。     

α-Carbonyl Radical Cyclization for the Total Synthesis of Natural Products

Intramolecular radical cyclization reactions are now used routinely to synthesize carbocyclic and heterocyclicstructures. We have reported that α-carbonyl radicals 1, generated from the corresponding iodo ketones or enones,underwent intramolecular radical cyclization smoothly to afford products 2. [1,2]     

氯甲基聚苯乙烯的鋰金属化反应及其在接枝聚合上的应用

使用不同条件,如不同溶剂、温度、反应时间、丁基锂用量及加料次序,将氯甲基化聚苯乙烯与丁基锂反应;然后选择没有交联的产物,使其与甲基丙烯酸甲酯进行接枝聚合。另外,又用氯甲基化聚苯乙烯在金属锂的存在下与甲基丙烯酸甲酯反应。 在乙醚溶液制得的聚苯乙烯次甲基锂与甲基丙烯酸甲酯反应不能分离出聚甲基丙烯酸甲酯及它的接枝共聚物。在甲苯溶液所制得的聚苯乙烯次甲基锂(表1甲_(45)及甲_(46))与甲基丙烯酸甲酯反应,产物通过分离提钝后,由元素分析,水解与交换量测定,浊度滴定,及红外光谱证明系接枝共聚物。甲基丙烯酸甲酯约占该接枝体重量的50％左右。 氯甲基化聚苯乙烯在金属锂存在下与甲基丙烯酸甲酯反应,产物通过分离提钝后,用浊度测定、水解后滴定交换量与热机械曲线也证明是接枝共聚物,但甲基丙烯酸甲酯只占该接枝体重量的3—3.5％左右。     

Vector-Valued John–Nirenberg Inequalities and Vector-Valued Mean Oscillations Characterization of BMO

We establish a vector-valued John–Nirenberg inequality for oscillations measured in a Banach function space (B.f.s.) norm. This inequality generalizes several existing results on John–Nirenberg inequalities on function spaces such as rearrangement-invariant B.f.s. and Lebesgue spaces with variable exponents. Moreover, this inequality also offers a new characterization of BMO in terms of the weighted vector-valued mean oscillation.     

Digitalized Mirror Array and Its Application in Large Telescope: Principle and Case Studies

In this article, we report the principle and conceptual design of a fundamentally different technology in fabricating high precision aberrationfree optical devices. The tip-tilt of facet in a mirror array is produced bydigitally controlled line-tilts of rows and columns. It has not only provided a cost-effective designing methodology in optical physics but also led to a much finer precision of 1 mili arc sec or less. As examples of the application of the proposed digitalised optics, two case studies have been given: a 10 m Schmidt telescope (off-axis) and an 8 m Cassegrain telescope (on-axis).