两指标AR过程的修正LS估计的强相合速度

本文利用鞅这一数学工具论证了两指标 AR 过程的修正 LS 估计的强相合性,并给出了强相合收敛速度。     

FORMATION AND MAGNETIC PROPERTIES OF A NOVEL Gd3(Fe,Ti)29Ny NITRIDE

The novel Gd₃(Fe_0.978Ti_0.022)₂₉ compounds and their nitride have been synthesized. The X-ray diffraction patterns of the Gd₃(Fe,Ti)₂₉N_y and its parent compounds were indexed in the Nd₃(Fe,Ti)₂₉-type structure with a monoclinic symmetry and space group P2₁/c, Both the nitride and the parent compounds exhibit ferrimagnetlc coupling. Nitrogenatio led to an increase in Curie temperature and saturation magnetization. The Curie temperatures are 517K for the parent and 765K for the nitride. The saturation magnetizations σ_s at 4.2K are 101.9A·m²/kg for the parent and 128A·m²/kg for the nitride. Both the nitride and parent exhibit a planar anisotropy. Nitrogenation led to a decrease of the contribution of Fe-sublattice to planar anisotropy. The anisotropy fields at 4.2K are 9.8T for the parent and 6.5 T for the nitride.     

PREPARATION AND EVALUATION OF SMALLBORE REVERSED PHASE HIGH PERFORMANCE LIQUID CHROMATOGRAPHIC COLUMN

A smallbore chemically bonded alkyl stationary phase column of 2 mm I. D.(inner diameter) and 15 cm in length having an efficiency of 6400—7600 theoretical plates has been developed. The column officicncy is nearly the same as that of routine analytical column of 4.6—5.0 mm I. D. The amount of cluant used for the smallbore column, however, is less than about one fifth that for the ordinary columns.Using the reaction of monochlorosilane with 5 μm accumulated silica bead produced in Qingdao Ocean Chemical Factory instead of trichlorosilane and irregular silica gel, we have. prepared a nonpolar chemically bonded phase packing which has a higher carbon content and more obvious hydrophobicity. Moreover, the reproducibility of the preparation is better.The equipment and assembly necessary for getting high efficiency with the smallbore column are discussed briefly. Using Model SW-1 smallbore column HPLC instrument developed in the institute with the Model K-1 column fittings and injector, the detector with     

INFLUENCE OF THE ELUENT COMPOSITION ON RETENTION IN REVERSED PHASE HIGH PERFORMANCE LIQUID CHROMATOGRAPHY (HPLC)

It is proved for the first time by means of measuring the retention values of 16 compounds that the relationship between solute retention and composition of eluent MeOH/H_2O in reversed phase (RP) system can be described with the equation In k'=b_0 b_1C_B b_2lnC_B which was drawn on the basis of liquid-solid chromatography (LSC) mode. The brief discussion about the several constants in the equation has been done.     

添加剂(2Fe)·(Sn)对SmCo5永磁体X射线衍射相对强度I200/I111影响的研究

本文研究了SmCo₅永磁体添加剂(2Fe)·(Sn)后Fe和Sn原子进入晶格对X射线衍射相对强度的影响,得出:Sn原子较易置换3g位上的Co原子,而Fe原子可以置换各个晶位上的Co原子,比较起来置换2c晶位上的Co原子更容易一些,3g位上的Co原子被Sn原子置换会增高I₂₀₀/I₁₁₁的比值,但使强度比改变的原因还有取向、形成Fe和Sn原子有序排列、应力状态改善和控制了～750℃相变的缘故。 关键词：     

亚波长衍射微透镜色散的数值分析

采用旋转体时域有限差分法对亚波长衍射微透镜进行数值分析，给出了在微透镜焦平面上的电场强度分布和从近场到远场的电场强度分布. 研究了亚波长衍射微透镜的色散，给出了入射波长不同于设计波长的色散曲线，数值分析结果表明了亚波长衍射微透镜的负向色散特性，而且随着波长的减小焦距增加得更快. 关键词： 亚波长衍射微透镜 色散 时域有限差分法     

基于面元检测方法的反导战斗部毁伤评估系统

基于计算机技术的战斗部毁伤评估系统不仅能评价战斗部的作战效能，指导战斗部的威力评定和战斗部设计，而且从目标角度，可评价目标的易损性及其生存力以及防护水平，具有很广的应用范围和重要的意义。反导战斗部毁伤评估系统是战术弹道导弹（TBM）、战斗部和交会关系的一个三元系统，根据系统的功能和特点，确定系统的功能模块和数据流，最终确定系统的总体框架见图1。     

Bergman空间上Toeplitz算子的局部化

Bergman空间上Toeplitz算子的局部化@孙善利@卢玉峰...     

高聚物多分散性与粘均分子量的关系

多分散性是高聚物的基本特征之一,分散程度大小直接影响高聚物的性质。高聚物的分散度一般用不同矩次的统计平均分子量之间的比值来表征,因此了解不同统计平均分子量之间的关系以及多分散性的影响,对高分子教学和实验研究是有必要的。本文拟从更为普遍的意义上讨论上述问题。     

碱金属原子量子亏损的微扰WKB计算

提出一个新的点电荷模型，用以模拟碱金属原子中原子实的电场性质，并用微扰ＷＫＢ法给出了量子亏损Δ的计算式。此式可反映量子亏损的实验规律。以锂、钠为例，对理论值和实验值的变化趋势进行了比较和讨论。