基于两级算法的对偶控制

考虑具有未知参数的随机系统的最优控制问题.采用包含新息方差指数项的损失函数优化系统的性能.新的损失函数由两部分组成:第一部分反映了对输出的调节作用;第二部分反映了辩识系统中未知参数应尽可能多地收集系统信息的需求.提出了一种两级优化算法.该算法首先把不可分问题转化为可分的两目标优化问题,再从两目标优化的非劣解集中挑出原问题的最优解.该控制律易于实施且具有对偶特点.仿真结果表明本文所得的控制律的有效性.     

捷联式惯导系统在车辆监控中的实现与应用

在道路交通飞速发展的今天,道路安全问题日益成为社会关注的焦点。特别是危化品货物的道路运输安全问题,已成为交通运输管理部门面临的重大难题。依据捷联式惯导系统和四元数法,提出车辆实时监控模型,并应用在危化品运输智能监控平台中。实验结果表明该模型是有效可行的。     

The globally asymptotic stability analysis for a class of recurrent neural networks with delays

This paper considers the problem of global stability of neural networks with delays. By combining Lie algebra and the Lyapunov function with the integral inequality technique, we analyze the globally asymptotic stability of a class of recurrent neural networks with delays and give an estimate of the exponential stability. A few new sufficient conditions and criteria are proposed to ensure globally asymptotic stability of the equilibrium point of the neural networks. A few simulation examples are presented to demonstrate the effectiveness of the results and to improve feasibility.     

掺杂荧光染料的高亮度有机蓝光电致发光器件

利用蓝色发光材料DPVBi掺杂高荧光染料rubrene做发光层制备了蓝色发光器件.在掺杂浓度为1.5%(wt)左右的情况下,当改变掺杂层的总的厚度时,器件的亮度、效率和色坐标都有明显的改变.当掺杂层DPVBi和rubrene的厚度为40nm,电子传输层Alq3的厚度为20nm,器件所加的电压是13v时,其最大亮度为14000cd/m2,此时的色坐标为(0.24,0.24),为蓝光发射.这种掺杂明显的提高了蓝光器件的发光效率.使最大效率达到2.5cd/A.     

可靠性计算中加快蒙特卡罗仿真收敛速度的方法

针对电力系统概率分析中蒙特卡罗仿真效率不高的问题,考虑到大型发输电组合电力系统可靠性计算的特点,采用改进的控制变量法来减小样本方差,综合考虑了影响抽样结果准确性和计算速度的诸多因素,如系统风险水平、收敛判据、控制变量的选择以及参数选定等,并将评估范围由系统指标扩展到节点指标。在IEEE RTS系统的测试结果表明,所提算法严谨、实用,计算效果明显,具有良好的应用价值。     

一种新型设备用断路器——NDB3的结构原理及应用

介绍了液压-电磁式设备用断路器的工作原理、产品特点及其在典型行业中的应用,阐述了这一区别于传统热磁式断路器的优点,及在通信行业中的典型应用。     

炸药冲击波激励氩气闪光实验研究

建立了对可见光和近红外的瞬态测试记录系统。用实验方法研究了氩气在炸药冲击小励下产生的可见光光强。测得了不同压力下氩气的辐射强度,分析了气体压力对光强的影响。     

广州一中大坦沙校区规划设计

介绍在广州市第一中学规划建筑设计方案构思过程中,对人文精神、校园特色、历史记忆等理念的理解和贯彻。探讨针对高中新建校区对老校区校园文化的归属感和认同感营造的设计语言的运用。     

Neurotoxicity of Chronic Co-Exposure of Lead and Ionic Liquid in Common Carp: Synergistic or Antagonistic?

Previous studies have indicated that the harmful heavy metal lead (Pb) contamination in aquatic systems has caused intelligence development disorders and nervous system function abnormalities in juveniles due to the increased permeability of the blood–brain barrier. Ionic liquids (ILs) are considered “green” organic solvents that can replace traditional organic solvents. Studies have found the presence of ILs in soil and water due to chemical applications or unintentional leakage. Therefore, what would happen if Pb interacted with ILs in a body of water? Could ILs enable Pb to more easily cross the blood–brain barrier? Therefore, we examined the combined exposure of Pb and ILs in common carp at low concentration (18.3 mg L⁻¹ of Pb(CH₃COO)₂•3 H₂O and 11 mg L⁻¹ of the IL 1-methyl-3-octylimidazolium chloride, 5% of their LC₅₀) for 28 days in the present study. The result of a neurobehavioral assay showed that chronic exposure of lead at lower concentrations significantly altered fish movement and neurobehaviors, indicating that lead exposure caused neurotoxicity in the carp. Increases in the neurotransmitter dopamine levels and injuries in the fish brain accounted for neurobehavioral abnormalities induced by lead exposure. Moreover, we also found that lead could easily cross the blood–brain barrier and caused significant bioaccumulation in the brain. Particularly, our study indicated that the ionic liquid could not synergistically promote blood–brain barrier permeability and hence failed to increase the absorption of lead in the fish brain, suggesting that the combined exposure of lead and ILs was not a synergistic effect but antagonism to the neurotoxicity. The results of this study suggested that ILs could recede the Pb induced neurotoxicity in fish.