Products of graceful trees

We give some conditions on H and $\text{G}$ for the rooted product H($\text{G}$) to be graceful. These conditions extend and unify previous results.     

γ射线暴的最新研究进展:火球模型、余辉及前身星

γ射线暴（称简γ暴）的研究在最近几年里有了巨大的突破。观测上，人们发现了γ暴的低能余辉以及与γ射线发同时的光学爆发，还发现了它位于宇学距离的寄主星系。越来越多的观测证据还表明长时标γ暴与恒星形成区、甚至可能与超新星成协。在γ暴的相对论火球模型框架下，人们对γ暴以及余辉的产生机制的认识也有了进展。进而人们对γ暴的前身星以及环境效应等有了新的认识。本文旨在对这些进展和认识给一个扼要的评述。     

Numerical simulation of atomic diffraction in the Raman-Nath regime

The theory of atomic diffraction from a classical standing wave light field in the presence of spontaneous emission in the Raman-Nath regime was developed by Tanguy et al. [6]. We describe the basis of computationally efficient methods for performing calculations in this regime and show their agreement with recent experimental results of Gould et al. [4].     

Improved estimators for the GMANOVA problem with application to Monte Carlo simulation

The problem of finding classes of estimators which improve upon the usual (e.g., ML, LS) estimator of the parameter matrix in the GMANOVA model under (matrix) quadratic loss is considered. Classes of improved estimators are obtained via combining integration-by-parts methods for normal and Wishart distributions. Also considered is the application of control variates to achieve better efficiency in multipopulation multivariate simulation studies.     

Molar heat capacity and thermodynamic properties of crystalline Ho(Asp)Cl<Subscript>2</Subscript>·6H<Subscript>2</Subscript>O

The molar heat capacity, C _p,m, of a complex of holmium chloride coordinated with L-aspartic acid, Ho(Asp)Cl₂·6H₂O, was measured from 80 to 397 K with an automated adiabatic calorimeter. The thermodynamic functions H _T-H _298.15 and S _T-S _298.15 were derived from 80 to 395 K with temperature interval of 5 K. The thermal stability of the complex was investigated by differential scanning calorimeter (DSC) and thermogravimetric (TG) technique, and the mechanism of thermal decomposing of the complex was determined based on the structure and the thermal analysis experiment.     

Asymmetric induction in simple [2 + 2] photoadditions

Photochemical cycloaddition of cyclopentene with enone esters $\text{1}$ containing different chiral auxiliaries yielded anti and syn adducts $\text{2}$ and $\text{3}$ in good yield and with moderate to high (79%) enantiomeric excesses.     

酶解鲐鱼蛋白制取低分子肽的进一步研究

确定了用胰蛋白酶－木瓜蛋白酶混合酶法水解鲐鱼蛋白制取低分子肽的最适工艺条件为：胰蛋白酶和木瓜蛋白酶的酶量比为１：４（Ｗ／Ｗ），肉水比为１：１，温度５５℃，ｐＨ７．０。在加酶量为鱼糜中蛋白质含量的１．２５％，反应时间６ｈ的条件下，制得的低分子肽无苦味，氮利用率可达７８．５％，平均链长为２．８０，游离氨基酸含量为２６．５７％，必需氨基酸含量占总氨基酸的４１．８％，且比例合理，富含镁，是一种很有开发前途的功能食品原料。     

三维空间中的有理样条插值

对三维空间某个多面体区域的四面体剖分，通过在每个四面体胞腔的棱和顶点设置适当的插值结点．本文给出了（１，１）型Ｃ⁰及Ｃ¹光滑的非奇异有理样条存在的充分必要条件．     

单重态氧发生器出口气流中水汽含量的光谱测量法

水汽的含量是化学法单重态氧发生器（ＳＯＧ）的重要性能参数之一，因为它不仅对Ｏ＿２（￣１△）有猝灭作用，而且在氧碘化学激光器（ＣＯＩＬ）光腔中对Ｉ￣＊也有严重猝灭作用。因此测控ＳＯＧ出口处的水汽含量有重要意义。本实验采用光谱强度比较法测量ＳＯＧ中的水汽含量，利用ＯＭＡ－３的二维扫描积累功能，可对不同测点的光谱进行同时扫描积累，从而可以对ＳＯＧ的数个测点同时进行水汽含量测定。测试精度可达±１０％。     

一种新型的固着磨料抛光片──WBN抛光片的制作工艺及其特性

本文描述了用冲击合成方法得到的超硬材料纤锌矿型氮化硼（ＷＢＮ）制作的一种新型抛光片。在光学玻璃抛光中的初步应用显示：这种新型的ＷＢＮ抛光片具有比传统的ＣｅＯ２。抛光片更大的切削力、更短的抛光时间和更好的表面粗糙度及更长寿命等优点。