Properties of a supercritical superdiffusion and solutions of its corresponding differential equation

The range and the nonextinction property of a supercritical superdiffusion and solutions of its corresponding differential equation are studied. It is pruved that under a suitable condition, the conditioned superprocess of the supercritical superdiffusion is a subcritical superdiffusion.     

Preparation and optical properties of solid solution semiconductor (Zn x Cd1−x S) doped silica glasses

Semiconductor(Zn_xCd_1−x S) doped silica glasses were prepared by Sol-Gel process andin situ growth technique. The structure of the materials was characterized by X-ray diffraction technique, the particle size of semiconductor crystallites from X-ray patterns was estimated less than 10 nm. From absorption spectra, it is obtained that the absorption edges shifted to short wavelength direction when Zn contents increased, and the absorption edge can be adjusted from 2.46 eV to 2.96 eV by controlling Zn contents. The third-order nonlinear optical susceptibility was studied at 532 nm with 8 ns pulse laser by degenerate four wave mixing (DFWM) technique.     

Cloning, construction of prokaryotic expression vector and expression ofEscherichia coli cytosine deaminase gene

Cytosine deaminase gene ofEscherichia coli strain H-30 was cloned, and its initiation codon of ‘GTG’ was mutated to ‘ATG’ by PCR. Prokaryotic recombinant expression vector pBV220-CD was constructed. Clone with high enzyme activity were selected by detecting their specific activity of cytosine deaminase. 5-FC(5-FC, 5-fluorocytosine) could induce the lethal toxicity to cells containing active CD gene. DNA sequence analysis indicated that there were 16 altered bases and 5 of them resulted in the alteration of amino acids in predicted peptide by comparing DNA sequence of the clone H-30-CD-11 with high enzyme activity with CD gene reported in Gene Bank.     

Preparation of InSb nanocrystals embedded in SiO2 thin films

InSb nanocrystals embedded in SiO₂ thin films were prepared by rf magnetron cosputtering technique. THe observation by transmission electron microscope showed that InSb nanocrystals dispersed uniformly in SiO₂ matrices. InSb nanocrystals with different sizes can be obtained by changing the annealing condition. The average size of InSb nanocrystals depended on annealing temperature and time, but not on the t_1/3 rules. X-ray photoelectron spectroscopy and X-ray diffraction were also applied to the analyses of the composite thin films.     

Weibull分布和极值分布场合下简单步进应力加速寿命试验的最优设计

产品的加速寿命试验被用来较快地获得关于产品寿命分布的信息.本文研究了Weibull分布和极小值分布下简单步加试验的最优设计问题.为解决Nelson折算法对极小值分布的数据处理产生特殊情况的问题,作者应用近年来一些新的研究成果,将位置-尺度分布中的尺度参数设为随应力变化的量进行最优设计.给出一实例,并将其推广到更一般的形式.     

早孕妇女蜕膜中淋巴细胞抗原的分析

检测早孕蜕膜中淋巴细胞抗原的表达。以几种抗淋巴细胞表面标志的单克隆抗体,采用花环标记、碱磷酶抗碱磷酶（ＡＰＡＡＰ）法,对２３例早孕蜕膜组织中的淋巴细胞进行测定。早孕蜕膜淋巴细胞中ＣＤ３＋、ＣＤ４＋、ＣＤ１６＋及Ｂ细胞百分率（ｘ±ｓ）分别为２９．５２±６．８０％、２３．６０±４．８０％、２０．９１±４．０６％、１．０７±１．００％、７．８１±２．５６％,ＣＤ４／ＣＤ８为１．２±０．２,ＣＤ３－淋巴细胞呈大颗粒淋巴细胞（ＬＧＬ）形态。早孕蜕膜中存在较多ＣＤ３－、ＣＤ１６－形态呈ＬＧＬ的ＮＫ细胞,ＣＤ４＋细胞与ＣＤ８＋细胞的比值较正常外周血明显降低。     

痰和咽拭子PCR及血清学联合检测肺炎衣原体急性呼吸道感染

了解成人呼吸道感染患者急性肺炎衣原体感染的发病情况。呼吸道感染患者１１０例,同时采集痰和咽拭子标本,应用聚合酶链式反应（ＰＣＲ）检测肺炎衣原体ＤＮＡ及采静脉血检测肺炎衣原体抗体。本组患者１７例（１６％）有肺炎衣原体近期感染的急性抗体,１２例（１１％）痰和（或）咽拭子肺炎衣原体ＰＣＲ检测阳性,联合应用两种方法的阳性率为２３％（２５／１１０例）。肺炎衣原体急性感染以哮喘急性发作、肺炎、ＣＯＰＤ急性加重和急性支气管炎患者多见（分别为５７％、３５％、２６％和２５％）,其临床表现无特征性。本组成人呼吸道感染患者肺炎衣原体急性感染的发病率较高,提示肺炎衣原体是呼吸道感染的重要致病原。     

科技进步统计监测软件系统的设计与实现

河北省科技进步统计监测软件系统以科技进步统计监测评价需求为指导,进行了合理的总体结构设计、系统功能设计、数据库设计、输入输出设计、存储设计,并在河北省大中型工业企业的科技进步统计监测评价中得到了应用。     

视觉形象的构造

网膜映象由大小不一、亮度值不等、边界不同的等亮度斑块组成,称其为视素。它们以“软”、“硬”两种形式接在一起构成了姿态万千的视觉世界。     

略议形容词补足语从句

本文指出“be+形容词+从句”是英语中经常碰到的一种句型,并且讨论了为什么把该句型中的从句改称为形容词补足语从句。