多径衰落短波信道中SFH／MFSK通信系统的性能

分析研究了慢跳频／Ｍ进制频率键控（ＳＦＨ／ＭＦＳＫ）通信系统在存在瑞利（Ｒａｙｌｅｉｇｈ）衰落和莱斯（Ｒｉｃｉａｎ）衰落的多径延时短波信道上的性能，导出了其准确的比特差错率的表达式，表明多径干扰数及其强度对系统性能的影响．同时给出了它们的数值结果和性能曲线．     

硅酸铋(BSO)晶体闪烁性能研究

报道对BSO晶体闪烁性能研究的若干结果. 包括晶体的激发光谱和荧光光谱、光产额、发光衰减时间和抗辐照能力等特性.     

液固对流相变问题的焓式有限元法

本文基于焓的对流扩散方程,提出一种求解具有糊状区液固相变对流传热问题的有限元方法,避免了通常采用温度对流扩散方程进行数值求解所带来的许多困难,对问题的解决更加自然、简便。算例表明,本文提出的方法是有效且可行的。     

弹性抗滑桩锚固段内力计算的反力荷载法

传统的抗滑桩锚固段内力计算是将锚固段视为Winkler弹性地基梁,以幂级数解法为基础,采用地基系数“m”法或“K”法,通过查表得到桩身内力,计算过程较为繁琐,且受表中各系数的截断误差的影响,常使内力计算结果存在一些偏差。以地基系数“m(K)”法的有限差分法是一种较为理想的方法,但需通过迭代计算,且分段数较多。本文基于地基系数“m(K)”法推导了抗滑桩锚固段内力计算的反力荷载法计算公式,提出了计算精度控制方法;较之于有限差分法,本文方法无需迭代计算,具有分段数少的特点;编写了全桩内力计算和图形处理程序;计算实例表明,与传统方法相比,可有效提高抗滑桩内力分析效率和计算精度,有利于抗滑桩结构的优化设计。     

一阶非线性项、四阶色散项的Boussinesq类方程

推导了由一阶色散项Ｏ（β２）表示的Ｂｏｕｓｉｎｅｓｑ类方程，方程中保留了一阶非线性项Ｏ（α）及四阶色散项Ｏ（β８），其中α＝Ａ／ｈ０，β＝ｈ０／Ｌ，Ａ为特征波高，Ｌ为特征波长，ｈ０为特征水深从理论上证明了Ｂｏｕｓｉｎｅｓｑ改善型方程对色散性精度的提高，阐明了此类方程对色散项所保留的精度为Ｏ（β８），而并非是此类方程推导之初的假设为Ｏ（β２）这一点，将改变人们传统的认识     

Direct Determination of Trace Dopamine in an Ascorbic Acid Solution at a Bare Glassy Carbon Electrode Using Differential Pulse Voltammetry

It is difficult to monitor dopamine (DA) accurately with a bare glassy carbon electrode because of the interference of ascorbic acid (AA). In this paper, a method for the determination of DA in an AA solution using differential pulse voltammetry was established. Because AA loses its electrochemical activity after being oxidized, hydrogen peroxide was used to oxidize AA, and the interference of AA was completely eliminated. As a result, trace DA could be directly determined in the AA solution with a bare glassy carbon electrode. When trace DA was determined in a 1.0 mmol L^?1 AA solution, there was a wide linear range from 3.0×10^?8 mol L^?1 to 1.0×10^?5 mol L^?1. The application of this method was demonstrated by the selective measurement of DA in an injection without pretreatment.     

Inverse colloidal crystal membranes for hydrophobic interaction membrane chromatography

Hydrophobic interaction membrane chromatography has gained interest due to its excellent performance in the purification of humanized monoclonal antibodies. The membrane material used in hydrophobic interaction membrane chromatography has typically been commercially available polyvinylidene fluoride. In this contribution, newly developed inverse colloidal crystal membranes that have uniform pores, high porosity and, therefore, high surface area for protein binding are used as hydrophobic interaction membrane chromatography membranes for humanized monoclonal antibody immunoglobulin G purification. The capacity of the inverse colloidal crystal membranes developed here is up to ten times greater than commercially available polyvinylidene fluoride membranes with a similar pore size. This work highlights the importance of developing uniform pore size high porosity membranes in order to maximize the capacity of hydrophobic interaction membrane chromatography.     

刚粘塑性强化球形薄壳在撞击体作用下的大变形动力分析

本文研究了在平头圆柱体的冲击下，薄球形壳的动力大变形。通过等度量变换，给出了球壳的变形模态。在Ｐｅｒｚｙｎａ和Ｓｙｍｏｎｄｓ的粘塑性本构模型基础上，设材料从Ｍｉｓｅｓ屈服条件，并假定弯矩的膜力不耦合。根据刚粘塑性强化材料的变分原理。给出球壳的运动方程结果与实验进行了比较，二者吻合较好。