The complement-activating action of modern x-ray contrast agents

The study conducted proved that triombrast (dose dependently) > hexabrics > Ultravist > or = melitrast = omnipac in a concentration interval of 0.03-30.0 mg iodine/ml in vitro and in a dose interval of 0.5-2.0 g iodine/kg in vivo activate the complement system (CS) according to the alternative way in the blood of "sensitive" rats. The degree of CS activation by radiopaque agents (ROA) is significantly determined mathematically by their viscosity and relation of the number of iodine atoms to the number of ions or dissolved particles, and by their hydrophilic (for nonion CS) and osmotic (for ion monomeric CS) properties.     

基于SL811的嵌入式USB主机研究与设计

针对USB主机嵌入式的需求,研究和设计了基于SL811的嵌入式USB主机系统。通过USB主从控制芯片SL811,把一个基于ARM7的嵌入式系统做成一个带USB接口的主机。用C语言编写USB主机驱动程序,通过交叉编译器arm-linux-gcc和arm-elf-tools分别对U-Boot和uCLinux进行移植及编译,从而实现嵌入式USB主机对U盘的读写操作。     

Decomposition of CO2 and CO into carbon with active wüstite prepared from Zn(II)-bearing ferrite

CO₂ decomposition reaction into carbon was studied at 300 °C using the H₂-reduced Zn(II)-bearing ferrite which consisted of the Zn(II) oxide and the active wüstite. The H₂-reduced Zn(II)-bearing ferrite was prepared from Zn(II)-bearing ferrite by the reduction with H₂ gas at 300 °C. The wüstite (FeO) in the H₂-reduced Zn(II)-bearing ferrite had a higher value (=0.97, active wüstite) than those of the normal wüstites (0.90<<0.95) prepared at high temperatures (>570 °C). The decomposition reaction of CO₂ proceeds in two steps: (1) CO₂ reduction to CO, and (2) CO decomposition into carbon. In the initial stage, the reduction of CO₂ into CO takes place, accompanying both the oxidation of the active wüstite to the slightly oxidized wüstite, and the transformation of active wüstite and Zn(II) oxide into the Zn(II)-bearing ferrite. After the reaction of the initial stage attains equilibrium of an apparent state of rest, the adsorbed CO is decomposed into carbon, associated with the transformation of the slightly oxidized wüstite and the Zn(II) oxide into the Zn(II)-bearing ferrite.     

Diagnostic value of the reaction of morphological dissociation of clotted blood (RMDCB) in nonspecific pneumonias and lung cancer

The authors studied separate parameters of the reaction of morphological dissociation of clotted blood in 97 patients, 83 of them suffering chronic nonspecific pneumonia and 14--lung cancer. Such RMDCB tests as the amount of the third fraction of blood coagulation (TFCB), the time of TFCB sediment formation and "the prognostic index" are found to be of certain diagnostic value, and along with other laboratory tests and clinical symptoms these allowed a differentiation between chronic nonspecific pneumonia and lung cancer.     

Research and application on three-dimensional seismic and vibration isolation for building

This paper presents the study of a three-dimensional(3D) isolation system.Firstly,the authors investigated the effects of an innovative 3D isolator,which was composed of a connecting plate,a rubber pad for vibration isolation in the vertical direction and a horizontal rubber bearing for seismic isolation in both horizontal directions.Secondly,the authors designed such a vibration isolation system and installed it underneath two specific residential buildings which were built directly over an existing subway communication hub platform in Beijing.These buildings required good performance vibration and seismic isolation system to reduce the impact from the running of nearby subway trains.Finally,in situ tests were conducted for both the isolated and the non-isolated buildings for the purpose of comparison.The test results showed that the maximum acceleration response level of the isolated superstructure is reduced by 10% as compared to that of the platform.The maximum attenuation of vibration reaches up to 25 dB.The 3D system explored in this paper is very effective in control and suppression of building vibration induced by earthquakes or running of trains.     

基于高海拔地区的大气中子单粒子效应实时测量试验研究

开展65 nm高速大容量静态随机存取存储器（SRAM）大气中子单粒子效应特性及试验评价技术研究,基于4 300 m高海拔地区大面积器件阵列实时测量试验,突破效应甄别、智能远程测控等关键技术,在153 d的试验时间内共观测到错误43次,其中器件内单粒子翻转39次,多单元翻转（MCU）在单粒子翻转中占比23%,最大的MCU为9位。对高能中子、热中子和封装α粒子的贡献比例进行了分析,并基于多地中子通量数据,推演得到北京地面和10 km高空应用时的单位翻转（SBU）和MCU失效率（FIT）。发现地面处软错误的主要诱因为封装α粒子,随着海拔的增高,大气中子对软错误的贡献比例明显增大;MCU全部由高能中子引起,北京10 km高空处的MCU FIT值明显增大,其占比由地面的8%增大至26%。结合器件版图布局,对MCU产生机理进行了深入分析。最后,提出一种目标导向的存储器软错误加固策略优化方法。     

电子元器件的贮存可靠性及评价技术

综述了国内外元器件的贮存可靠性研究现状,分析了元器件贮存失效模式及原因,表明减少元器件自身缺陷、改善固有可靠性是提高其贮存可靠性的关键。并从应用性角度出发,对现场贮存、长期自然贮存试验、极限应力、加速贮存寿命试验等贮存可靠性评价技术进行了对比分析。     

栅氧化层TDDB可靠性评价试验及模型参数提取

采用恒定电压和恒定电流试验方法对20nm栅氧化层进行了TDDB可靠性评价试验，并完成了1／E模型参数提取，给出了恒定电流应力下描述氧化层TDDB退化的统计模型，较好地解释了试验结果。     

加速度地震检波器简谐振子有限元分析

介绍简谐振子的工作原理。利用ANSYS软件,采用有限元法创建了简谐振子质量块的实体模型,选择单晶硅作为简谐振子中质量块的材料;设置了模型的材料属性,采用智能分网的方式对模型划分网格,并对质量块模型施加沿x轴水平方向载荷,进行三维的静力分析和模态分析。静力分析得到实体模型的总位移是0.236×10-19μm;模态分析时只对前四阶模型进行了分析,根据其振型图及其总位移的应力云图,得到实体模型的二十阶振动模态的频率是78 001Hz,二十阶的总位移是0.122×10-6μm。     

香豆素-铜离子(Ⅱ)配合物硫醇荧光探针的合成及荧光性质

以8-甲酰基-7-羟基香豆素-3-甲酸乙酯与2-氨基苯酚为原料合成了一种亚氨基香豆素类衍生物,其在与铜离子络合后制成了香豆素-铜离子配合物硫醇荧光探针。该探针在体积分数50%的乙醇水溶液中对含有巯基的氨基酸具有良好的选择性。通过荧光光谱,研究了探针的检测机理。在探针识别过程中荧光强度明显增加,在365 nm紫外光激发下荧光颜色由绿色变为蓝色,可以实现可视化检测。