Na2S2O3类稳定剂在化学镀Ni-P工艺中的应用研究

在合理选择化学Ni-P合金配方和工艺条件的前提下,采用对比试验比较了几种稳定剂对化学镀Ni-P合金性能的影响,综合各类稳定剂对镀液及镀层性能的影响,选取影响工艺性能的3个工艺参数,采取正交试验方案,研究了Na2S2O3与其他稳定剂复配时的性能变化规律,得出了较理想的稳定剂用量范围。     

p-Moment Stability of Nonlinear Stochastic Difference Equations

In the paper, nonlinear ordinary stochastic difference equations are first studied. Then a few of sufficient conditions on （uniform, uniform and asymptotic, uniformly asymptotic） p-moment stability of these equations are established by Liapunov function.     

KJ4-2000安全监控系统的稳定性与网络安全

随着煤矿安全监控系统在煤矿安全生产中的重要作用日益显著,尽可能实现监控信息共享.煤矿安全监控系统逐步向网络化方向发展,但网络的不安全因素,如病毒、黑客等,极大地破坏了安全监控系统的稳定性,保障安全监控系统的网络安全已经成为监控系统管理的重要工作;重点介绍了在KJ4-2000监控系统的实际运行中,通过改造网络结构,增设应用代理,布置广义分布式防火墙等技术手段,建立安全的监控系统网络环境,确保监控系统稳定可靠运行.     

高校教师思想政治工作与社会稳定

阐述高校教师思想政治工作的重要性,指出高校教师队伍整体思想现状是健康、积极、向上的,但也存在一些值得关注的问题。提出为了维护校园和社会稳定,应始终坚定不移地以邓小平理论、江泽民“三个代表”思想作为高校教师思想政治工作的武器;加强理论研究和思想政治工作规律探索,提高思想政治工作效能;充分发挥高校基层党组织的战斗堡垒作用和广大教师党员的先锋模范作用;引导广大高校教师参加社会实践,让他们了解中国国情,关注社会,关爱民生,增强维护社会稳定的紧迫感。     

年幼儿童特质稳定性理解的乐观主义

以个别测查法或问卷法分别对4—5岁的幼儿、7—8岁的小学低年级儿童和20-22岁的大学生共120人进行了8个故事测验，以考察他们对于积极或消极特质稳定性的理解。采用重复测量方差分析统计发现，各年龄组对于消极特质稳定性的预测分数差异显，在积极特质稳定性上的预测分数则不存在显的年龄差异。这一研究结果表明，与作为成人组被试的大学生相比，无论是消极特质还是积极特质，幼儿与小学低年级儿童对它们的稳定性都持有一种积极乐观的态度。尽管这种乐观态度是超现实的，但在保护年幼儿童的自尊和动机方面扮演了重要角色，对于解释青春期无助感和自杀的发生具有一定的意义。     

体育教学训练中下胫腓联合损伤的研究及防治

下胫腓联合是维持踝关节稳定的重要结构,其损伤是一种比较常见的运动损伤,容易造成踝关节慢性不稳定、长期疼痛和创伤性关节炎等后遗症。通过对其解剖结构、功能特点及损伤机制的探讨,总结诊治方法,提出预防措施,以减少运动损伤的发生,提高体育教学训练的质量。     

生物膜弹性的几何理论

利用现代微分几何的理论讨论生物膜的弹性行为。首先讨论了开口脂质膜的形状方程和边界曲线方程,并且得到了2个解析解,它们代表的形状与在实验中的图形吻合;其次建立了细胞膜的复合膜模型,并讨论了它的力学稳定性,从而证明了膜骨架能够极大地提高细胞膜的力学稳定性。     

On direct adaptive control design for nonlinear discrete-time uncertain systems

In this paper, we develop a direct adaptive control framework for adaptive stabilization of the MIMO nonlinear uncertain systems, which can be represented as discrete-time normal form with input-to-state zero dynamics. The framework is Lyapunov-based and guarantees partial stability of the closed-loop systems, such that the adaptation of the feedback gains can stabilize the closed-loop system without the knowledge of the system parameters. In addition, our results show that the adaptive feedback laws can be characterized by Kronecker calculus. Two numerical examples are given to demonstrate the efficacy of the proposed framework.     

Design of sliding surface for mismatched uncertain systems to achieve asymptotical stability

The design of an adaptive sliding mode control (SMC) scheme is proposed in this paper for stabilizing a class of dynamic systems with matched and mismatched perturbations. Two methods for designing a novel sliding surface function are introduced first. By utilizing a pseudocontrol input in the sliding surface function, one cannot only suppress the mismatched perturbations in the sliding mode, but also obtain the property of asymptotical stability. Then a sliding mode controller is designed to drive the controlled systems to the designated sliding surface in a finite time. Adaptive mechanism is also embedded in the controller as well as in the sliding surface function designed from the second method to overcome the perturbations, so that the informations of upper bound of perturbations are not required. An application of flight control and experimental results of controlling a servomotor are also given for demonstrating the applicability of the proposed control scheme.