群射防空火箭炮射序优化

在建立群射防空火箭炮动力学模型的基础上,确立了射序优化的目标,考虑到其影响因素,编排了可能发射顺序.进行了仿真和数据处理,优选出了较好的射序.结果表明:火箭弹群组的合理构成和射序的中心对称能提高射击精度,发射箱质心位置变化历程的不同对起始扰动影响很大.此结论能够直接应用到该型火箭炮的实战中.     

基于遗传算法的火箭转塔伺服系统最优PID控制研究

文中对某火箭发射装置的模拟位置伺服控制系统进行了研究.针对系统进行了建模和相关参数的计算;最后对系统进行仿真,得到基于遗传算法的最优的控制器参数Kp,Ki,Kd.仿真结果表明,基于遗传算法的PID控制器可以实现工程的性能指标要求,具有很好的效果.     

考虑循环寿命折损的主动配电网仿射可调鲁棒优化方法

针对主动配电网在源荷储协同下的不确定性优化问题,提出了基于仿射可调鲁棒优化的主动配电网运行策略。首先,考虑分布式光伏的可控模型、循环寿命折损的电池储能模型和ZIP负荷模型,构建了主动配电网优化运行模型。然后,采用椭球集合来描述分布式光伏出力的不确定性,并结合仿射策略形成优化模型中决策变量与分布式光伏出力不确定性变量之间的线性决策机制。最后,通过对偶变换将主动配电网鲁棒优化模型转化为一个确定性的混合整数二阶锥规划模型进行求解。在改进的IEEE33节点算例系统中对比验证了所提出的仿射可调鲁棒优化方法的有效性和优点。     

考虑电池储能老化和需求侧响应的交直流混合配电网动态重构方法

现有的电池储能模型一方面认为电池的充放电功率和效率为固定不变的,另一方面有关电池储能的充放电过程对循环老化的影响缺少考虑,这与电池单元本体的非线性等效电路模型相违背。因此,考虑电池储能的循环老化成本、需求侧响应,提出了交直流混合配电网动态重构方法。通过对实际电池储能的充放电功率的运行区域进行采样,在凸包络的采样点集合中将非理想状态下的电池储能模型重构为线性模型。在此基础上,分别建立了基于累积吞吐电量和放电深度的循环老化成本模型,构建了综合成本最小化的交直流混合配电网动态重构模型。并采用混合整数二阶锥规划方法求解。在改进的33节点算例上仿真验证了所提基于放电深度的循环老化成本模型的经济性,分析了交直流混合配电网重构方法经济性的影响因素。     

数字多讯道校区教学演播系统设计

阐述了数字多讯道演播室系统的建声和摄像、录音、灯光的综合设计架构和工程设计要点;并且简要介绍建声和摄录编特性,以及灯光效果和数字化传播的全程控制;同时简单描述数字化录音制作的强大功能和丰富多样的技术处理能力,还有高品质的录音质量等优越性。图文并茂地举例介绍了计算机音频工作站,对经常碰到的实际问题提出了方便简洁的处理方法和优异的实际效果。     

Increasing incidence of carcinoma of the gastric cardia in Sweden from 1970 to 1985

Several American, Japanese and European centres have reported an increase in carcinoma of the gastric cardia, contrary to the general trend in the incidence of gastric cancer. The aim of this nationwide population-based study was to describe trends in the incidence of tumours of the gastric cardia in Sweden over the 16-year period from 1970 to 1985. The Swedish cancer register, which is more than 95 per cent complete, was used to identify cases. There were 1514 men and 481 women with cancer of the gastric cardia. The age-standardized rates increased in men from 1.9 per 10(5) population in 1970-1973 to 3.0 per 10(5) in 1982-1985, corresponding to a mean annual increase of 2.5 per cent (95 per cent confidence interval (c.i.) 1.6-3.4 per cent). In women, the age-standardized rates increased from 0.5 per 10(5) in 1970-1973 to 0.8 per 10(5) in 1982-1985, the mean annual increase being 0.9 per cent (95 per cent c.i. 0.0-1.8 per cent). The highest incidences were found in southern Sweden, contrary to the geographical distribution of gastric cancer in general, which shows a south-to-north gradient. The disparate epidemiological features of cancer of the cardia and gastric cancer at other sites suggest that the aetiologies may also be different. Since little is known about the aetiology of cancer of the cardia, and the incidence seems to be rising rapidly, analytical studies are urgently needed.     

ZAP-70 association with T cell receptor zeta (TCRzeta): fluorescence imaging of dynamic changes upon cellular stimulation

The nonreceptor protein tyrosine kinase ZAP-70 is a critical enzyme required for successful T lymphocyte activation. After antigenic stimulation, ZAP-70 rapidly associates with T cell receptor (TCR) subunits. The kinetics of its translocation to the cell surface, the properties of its specific interaction with the TCRzeta chain expressed as a chimeric protein (TTzeta and Tzetazeta), and its mobility in different intracellular compartments were studied in individual live HeLa cells, using ZAP-70 and Tzetazeta fused to green fluorescent protein (ZAP-70 GFP and Tzetazeta-GFP, respectively). Time-lapse imaging using confocal microscopy indicated that the activation-induced redistribution of ZAP-70 to the plasma membrane, after a delayed onset, is of long duration. The presence of the TCRzeta chain is critical for the redistribution, which is enhanced when an active form of the protein tyrosine kinase Lck is coexpressed. Binding specificity to TTzeta was indicated using mutant ZAP-70 GFPs and a truncated zeta chimera. Photobleaching techniques revealed that ZAP-70 GFP has decreased mobility at the plasma membrane, in contrast to its rapid mobility in the cytosol and nucleus. Tzetazeta- GFP is relatively immobile, while peripherally located ZAP-70 in stimulated cells is less mobile than cytosolic ZAP-70 in unstimulated cells, a phenotype confirmed by determining the respective diffusion constants. Examination of the specific molecular association of signaling proteins using these approaches has provided new insights into the TCRzeta-ZAP-70 interaction and will be a powerful tool for continuing studies of lymphocyte activation.