Ti(Fe_(1-x)Mn_x)金属间化物的穆斯堡尔效应研究

用X射线衍射和穆斯堡尔效应对金属间化物Ti(Fe_(1-x)Mn_x)的结构随锰含量的改变而变化进行了系统的研究,结果表明,当x≥0.45时发生了结构相变.对三元系合金的同质异能移数值变化作了一定解释.     

Dynamics of proteins in Golgi membranes: comparisons between mammalian and plant cells highlighted by photobleaching techniques

In less than a decade the green fluorescent protein (GFP) has become one of the most popular tools for cell biologists for the study of dynamic processes in vivo. GFP has revolutionised the scientific approach for the study of vital organelles, such as the Golgi apparatus. As Golgi proteins can be tagged with GFP, in most cases without altering their targeting and function, it is a great substitute to conventional dyes used in the past to highlight this compartment. In this review, we cover the application of GFP and its spectral derivatives in the study of Golgi dynamics in mammalian and plant cells. In particular, we focus on the technique of selective photobleaching known as fluorescence recovery after photobleaching, which has successfully shed light on essential differences in the biology of the Golgi apparatus in mammalian and plant cells.     

GFP标记的GDNF重组腺病毒载体的构建和体内外表达

通过构建绿色荧光蛋白(GFP)和胶质细胞源性神经营养因子(GDNF)共表达的腺病毒载体,讨论其在治疗脊髓和脑有关神经系统疾病的潜在应用价值,了解腺病毒载体在大鼠体内的分布及在体外分泌外源基因产物能力,并对其生物安全性作了初步考察,为GDNF重组腺病毒载体在临床和基础研究中的应用作了一定准备．     

Structural stability of infinite-layer CaCuCO<Subscript>2</Subscript> under high pressure

Since the discovery of high temperature supercon-ductivity by Bednorz et al. in 1986[1], many series of cu- prate superconductors have been synthesized. Critical temperature has been improved continuously. But no verdict has been given upon what mechanism causes su- perconductivity. CaCuO2 conductive layers are the parent structure of the high Tc cuprate superconductors, such as Cu-12 (n-1)n[2], Tl-12(n-1)n[3] and Hg-12(n-1)n[4,5] super- conductor families. In 1988, infinite-layer (Ca0.86S…     

X－ray reflectivity investigation of the foam bilayer film formed by hexaethylene glycol dodecyl ether

When the thickness of soap foam film varies in adefinite region, color changes of a soap bubble will be observed due to the interference of light. Black soap films are the final stages of thinning of soap films due to the drainage of water in the absence of evaporation and are generally formed from solutions of an ionic surfactant in the presence of salt. After a bubble is formed, in the beginning the soap film is relatively thick and it appearswhite; then the film thins gradually and finally …     

基于Creator的飞行视景三维模型数据库优化技术

根据飞行视景仿真中三维建模的特点和要求,利用Creator强大的可视化建模功能和模型数据库优化技术,从调整模型数据库层级结构、减少模型复杂度和减小模型文件尺寸等几个方面着手,创建飞行视景仿真中所必需的飞机/导弹、座舱仪表和地形等典型对象的三维模型,在模型的复杂度和逼真度之间进行平衡,通过某飞行模拟训练系统软件开发中三维模型优化前后运行性能参数的对比,表明了优化建模的必要性和该建模技术在普通PC平台上支持飞行视景实时仿真的可行性.     

区域前兆台网的管理

简要介绍了广东前兆台网“十五“项目的部署情况。根据国家地震前兆台网中心的工作要求,制定了相应的区域前兆台网中心和台站的规章制度,对中心和台站进行规范化管理。该工作仍在不断改进和完善中,目的是要按质、按量、按时地提供前兆数据。     

X射线磁性圆二色吸收谱:实验设备与初步实验

合肥国家同步揭射实验室已建立了初步的X射线磁性圆二色吸收谱（XMCD）技术，可以测量铁磁性3d过渡族元素Fe，Co和Ni的L边的XMCD，并获得它们的轨道和自旋磁矩．XMCD线站的主要技术参数为：能量范围100～1000eV，光子通量≈10^8 ph／s，能量分辨率≈1000；外磁场1500Gs.除了测量XMCD外，还可以测量C，N，O的K边近边吸收谱，以及部分元素的L边近边吸收谱．     

纳米Ti(CN)基金属陶瓷烧结过程中的相成分变化

采用在不同温度下真空烧结和X射线衍射研究纳米Ti(CN)基金属陶瓷在烧结过程中的相成分演变。研究结果表明:纳米Ti(CN)基金属陶瓷在900℃后,Mo2C和TaC由于扩散而发生固溶反应;在1 200℃前,Mo2C和TaC固溶反应结束,两相均消失;WC在1 100℃后,开始由于扩散而发生固溶反应,在1 250℃前消失;在1 250℃后,合金中只有Ti(CN)和Ni(Ni Co)两相存在;与纳米Ti(CN)基金属陶瓷不同,微米Ti(CN)基金属陶瓷中的WC在1 200℃后,由于扩散而发生固溶反应,在1 300℃消失;纳米Ti(CN)基金属陶瓷在固相反应完成之前,随着烧结温度的升高,硬质相和粘结相的晶格常数增加。     

一种起重量限制器的数据采集电路设计及误差计算

介绍了一种起重量限制器的数据采样电路的设计,并对压力传感器、电源、仪表放大器AD620、模数转换器误差进行了分析。