导弹测发控系统故障诊断模糊专家系统

目的　建立导弹测发控系统故障诊断模糊专家系统的基本结构,并给出一个具体的故障诊断实例; 方法　首先对导弹测发控系统的故障机理进行分析,进而研究基于模糊Ｐｅｔｒｉ网模型的故障诊断技术的应用,最后提出了本系统的设计思想和实现方法; 结果　建立了基于模糊Ｐｅｔｒｉ网模型的导弹测发控系统故障诊断模糊专家系统,该系统能对故障的模糊性和精确性知识进行统一描述和推理,并具有可修改性和可扩充性等优点; 结论　通过对某型导弹测发控系统配电分系统的故障诊断实例,说明了系统实现的可行性;     

供应链物流能力:流通量和响应时间测算模型

对供应链整体物流过程中的能力表现进行了建模、量化与测度．针对大部分的物流能力多以“数量”和“时间”为基础这一事实,将供应链网络视作完整的物品流通平衡网络,对供应链的最大流量、整体流通量和响应时间三个指标进行了分析和推导,确定了指标测度的量化公式．通过对公式的分析,从节点的流通能力和处理时间、节点之间路线上物品的流量、节点之间路线的长度、路线上物品移动的速度和路线上花费的时间等五个方面,对提高供应链流通和时间响应能力进行了简要分析．     

Loss of huntingtin-associated protein 1 impairs insulin secretion from pancreatic β-cells

Hap1 was originally identified as a neuronal protein that interacts with huntingtin, the Huntington’s disease (HD) protein. Later studies revealed that Hap1 participates in intracellular trafficking in neuronal cells and that this trafficking function can be adversely affected by mutant huntingtin. Hap1 is also present in pancreatic β-cells and other endocrine cells; however, the role of Hap1 in these endocrine cells remains unknown. Using the Cre-loxP system, we generated conditional Hap1 knockout mice to selectively deplete the expression of Hap1 in mouse pancreatic β-cells. Mutant mice with Hap1 deficiency in pancreatic β-cells had impaired glucose tolerance and decreased insulin release in response to intraperitoneally injected glucose. Using cultured pancreatic β-cell lines and isolated mouse pancreatic islets, we confirmed that decreasing Hap1 could reduce glucose-mediated insulin release. Electron microscopy suggested that there was a reduced number of insulin-containing vesicles docked at the plasma membrane of pancreatic islets in Hap1 mutant mice following intraperitoneal glucose injection. Glucose treatment decreased the phosphorylation of Hap1A in cultured β-cells and in mouse pancreatic tissues. Moreover, this glucose treatment increased Hap1’s association with kinesin light chain and dynactin p150, both of which are involved in microtubule-dependent trafficking. These studies suggest that Hap1 is important for insulin release from β-cells via dephosphorylation that can regulate its intracellular trafficking function.     

Antenna selection for V-BLAST systems in correlated channel

Spatial multiplexing systems can provide significant capacity improvement but are sensitive to channel correlation. Antenna selection is a low-cost low-complexity ahemative to resolve these problems. This paper proposes a new transmit antenna selection algorithm for the spatial multiplexing systems with the Vertical-Bell Labs Layered Space-Time （V-BLAST） nonlinear receiver in correlated channel. The proposed scheme separates the optimization into two parts： it first chooses the optimal number of substreams in terms of the singular values of the channel matrix, then adapts the mapping of substreams to antennas according to the post-detection signal-to-noise ratio （SNR）. Simulation results illustrate that the proposed two-step selection criterion can provide greater selection gain than the existing singnlar value based selection criterion as SNR and scattering angle increases. The proposed criterion outperforms the existing one by 0.3 dB at a vector symbol error rate of 10^- 3 and scattering angle of 20 degree.     

具有外部扰动的非完整移动机器人的有限时间跟踪控制(英文)

研究了具有外部扰动的动态模型的非完整移动机器人有限时间跟踪控制问题,介绍了一种有限时间扰动观测器来估计外部扰动.首先,移动机器人的跟踪误差系统被转换成两个子系统:一个三阶子系统和一个二阶子系统.然后,我们分别讨论了这两个子系统,并且设计了连续的有限时间扰动观测器和有限时间跟踪控制律.严格的证明表明了移动机器人可以在有限时间内跟踪上期望的轨迹.仿真例子说明了我们方法的有效性.     

Proteomics study of the effects of high pigment-1 on plastid differentiation during the ripening of tomato fruits

The chloroplast-to-chromoplast difference is a highly regulated process. Tomato （Solanum lycopersicum） high-pigment mutant hp-1 shows an enhanced accumula- tion of carotenoids coupled with an increase in the volume and number of plastids. However, how chromoplasts of hp-] acquire their specific metabolic characteristics is still unclear. A comparison of proteome profiles from plastids at the mature green, breaker, and red stages of tomato fruits showed 45 differentially expressed proteins. These identi- fied proteins fell into six different functional categories. Our results showed that most of the proteins related to the Calvin cycle increased transitorily only at the early breaker stage, and remained unchanged at the early red stage. We found 18 proteins that were differentially expressed between the wild type and hp-1. The abundance of GCPE in chromoplasts of hp-1 was higher than that in the wild type. Meanwhile, we found that heat shock proteins were only present specifically in the mature green stage chromoplasts of hp-1 but not in the wild type. This suggested that GCPE and heat shock proteins might play important roles in the accumulation of high carotenoids in hp-1. Overall, our results could be helpful for understanding chloroplast-to-chromoplast differentiation and the function of hp-1.     

热对流对土壤温度和能量平衡的影响

在传统的土壤热传导方程基础上,耦合了土壤水分的垂直运动引起的热对流项,用金塔绿洲2005年6月11-15日的观测数据分别计算了土壤热扩散系数以及水的通量密度.以0.05 m深度的土壤层为上边界,模拟了0.10 m和0.20 m深度的土壤层温度,并比较了计算的地表能量闭合因子.结果表明:热传导对流方法模拟的土壤温度与实际...     

航班地面等待问题建模及优化

首先建立了一种单机场地面等待问题的事件驱动优化模型,该模型综合考虑了航班的延误成本差异、最大延误时限以及尾流间隔等其他多种因素;然后提出了一种改进的自适应遗传算法对该模型进行求解,该算法对传统适应度函数形式和初始群体的产生加以改进,并针对问题特征定义了交叉算子.通过对多组算例进行仿真验证,实验结果表明,本文的模型与算法对降低延误成本以及控制航班最长延误时间取得了明显的优化效果.     

门槽几何参数对湍流场低压效应的大涡模拟

采用大涡模拟方法对水工平面闸门门槽区湍流场进行了计算分析.系统地模拟了门槽的宽深比、错距比、斜坡比及圆角比等几何参数变化对门槽内部及其附近水流的水力特性的影响,结合门槽水流空化的易发生部位,重点探讨了门槽内部漩涡区和门槽下游角隅后侧分离区的低压分布.结果表明:门槽宽深比和错距比的变化对门槽水流的压力分布作用效应明显,宽深比的大小变化会影响到门槽水流极低压力区的转换,错距可消除分离负压区;设置斜坡和圆角能在一定程度上改善门槽水流流态和压力分布.     

MWMIS网关软件的功能设计

描述了MWMIS网关软件的系统结构．它由四个程序组成实时监控计算机端的数据发送程序、网关端的定义动态数据点程序、网关端的实时数据处理程序和客户端的实时数据显示程序．该子系统充分地利用了原有资源，使原有的计算机监控系统中的数据同新建的MIS有效地集成起来．