一类时延网络控制系统的最优非脆弱H∞控制

针对一类时延网络控制系统,研究了当存在有限能量外部扰动时,系统的最优状态反馈非脆弱H_∞控制律的设计问题。通过将时延看作系统的时变参数不确定性,应用H_∞鲁棒控制理论及线性矩阵不等式(LMI)技巧,给出了具有控制增益扰动的次优非脆弱H_∞控制律存在的充分条件,提出了最优非脆弱H_∞控制律的设计方法。数值仿真例子表明了所提方法的有效性。     

高级雅丝爽系列产品的开发与试制

利用精纺高支毛涤纱与新型蛋白质纤维－毛型粗旦丝巧妙结合,配以新奇的花型,淡雅的色调,开发试制出全新的高级衬衣面料。     

提高氯化钾产品粒度的研究

本文以工业结晶及相图理论为依据,针对冷分解—热溶结晶法制取氯化钾过程中,影响结晶产品粒度的主要因素进行了实验研究、分析了影响粒度的各主要因素对粒度的影响,并指出了生产实践中提高产品粒度的具体途径,实验表明,控制适宜的条件,可获得粒度达０．４９ｍｍ,质量高达９９％（干基）以上的产品     

随机微分方程解的不合流性

研究了一维Ｉｔｏ型随机微分方程,在相当弱的条件下,当扩散系数非退化时,证明了方程强解的不合流性。     

长春邮件处理中心工艺设备安装工程监理实践

通过对长春邮件处理中心工艺设备安装工程监理的实践，详细论述了监理过程中监理工程师应采取的措施，并提出了邮件处理中心工艺设备安装工程监理中应注意的几个问题。     

Construction of VS2/VOx Heterostructure via Hydrolysis-Oxidation Coupling Reaction with Superior Sodium Storage Properties

Heterostructure engineering is one of the most promising modification strategies for reinforcing Na⁺ storage of transition metal sulfides. Herein, based on the spontaneous hydrolysis-oxidation coupling reaction of transition metal sulfides in aqueous media, a VO_x layer is induced and formed on the surface of VS₂, realizing tight combination of VS₂ and VO_x at the nanoscale and constructing homologous VS₂/VO_x heterostructure. Benefiting from the built-in electric field at the heterointerfaces, high chemical stability of VO_x, and high electrical conductivity of VS₂, the obtained VS₂/VO_x electrode exhibits superior cycling stability and rate properties. In particular, the VS₂/VO_x anode shows a high capacity of 878.2 mAh g⁻¹ after 200 cycles at 0.2 A g⁻¹. It also exhibits long cycling life (721.6 mAh g⁻¹ capacity retained after 1000 cycles at 2 A g⁻¹) and ultrahigh rate property (up to 654.8 mAh g⁻¹ at 10 A g⁻¹). Density functional theory calculations show that the formation of heterostructures reduces the activation energy for Na⁺ migration and increases the electrical conductivity of the material, which accelerates the ion/electron transfer and improves the reaction kinetics of the VS₂/VO_x electrode.     

Ultra-Damping Composites Enhanced by Yolk–Shell Piezoelectric Damping Mechanism

High-performance damping materials are significant toward reducing vibration and maintaining stability for industrial applications. Herein, a yolk–shell piezoelectric damping mechanism is reported, which can enhance mechanical energy dissipation and improve damping capability. With the addition of yolk–shell particles and carbon nanotube (CNT) conductive network, damping properties of various resin matrices are enhanced with the energy dissipation path of mechanical to electrical to heat energy. Particularly, the peak loss factor of epoxy composites reaches 1.91 and tan δ area increases by 25.72% at 20 °C. The results prove the general applicability of yolk–shell piezoelectric damping mechanism. Besides, the novel damping materials also exhibit excellent flexibility, stretchability, and resilience, offering a promising application toward damping coating, indicating broad scope of application in transportation and sophisticated electronics, etc.     

Low series resistance high-efficiency GaAs/AlGaAs vertical-cavity surface-emitting lasers with continuously graded mirrors grown by MOCVD

GaAs/AlGaAs vertical-cavity top-surface-emitting lasers (VCSELs) with a continuously graded mirror composition have been grown by MOCVD, and planar devices with proton-implant current confinement have been characterized. Continuous grading of the heterointerfaces in the Bragg reflectors eliminated the energy-band discontinuities, thus improving carrier transport and resulting in a substantial reduction in the series resistance and threshold voltage of the laser diodes. These VCSELs have excellent room-temperature CW electrical characteristics, including some of the lowest series resistances, highest power efficiencies and lowest operating voltages ever reported.<>     

对引进离子注入机损坏部件进行国产化替换的尝试

国内引进了不少离子注入机,维修问题日渐重要。对其损坏部件,用国产配件进行替换,不乏为又快又省的维修方法。本文叙述了八年多来,我们在维修IM—200M型离子注入机的实践中,对损坏的吸极电源、氟里昂热交换器和化学机械泵等重要部件,用自制的或改制的国内配件进行替换,从而保证了设备安全运行二万五千多小时,注入八万五千多块硅及GaAs靶片,完成了集成电路研制和开发任务。     

晶体非线性系数微机测量系统

本文详细叙述了晶体非线性系数微机测量系统的基本结构、软硬件设计。简要讨论了系统运行结果,并给出了SiO_2晶体样品的马克条纹法测试图形。