聚亚苯基硼的合成及表征研究

用改进的有机金属路线合成了聚对亚苯基硼和聚间亚苯基硼。聚对亚苯基硼的分子量（Ｍｎ）为７８３．６６,结构为（１）（可溶于乙醚,苯环为对位取代）和（２）（不溶于乙醚,苯环对位取代）;聚间亚苯基硼的Ｍｎ为８７６．５６,结构为（１）（可溶于乙醚,苯环间位取代）和（２）（不溶于乙醚,苯环间位取代）。     

一种串行通信的误码率测试方法

针对目前导弹系统RS-422,RS-485等串行通信总线的误码率测试没有统一、科学、客观的测试方法与测试仪器,提出一种基于通信设备内部自身通信验证的误码率测试方法,该方法采用通讯设备的自闭环链路实现收发端口互相校验,以半双工的工作方式,在多通道串行通信模块的通道之间建立发送-接收链路,基于伪随机码m序列为测试码流,利用统计学中的置信度原理,在保证测试结果的可信度前提下,定量地评估通信系统的质量,具备充分理论依据的基础上实现了低成本高效率的误码率测试.     

我国反恐怖斗争对策研究

随着以美国为首的国际反恐怖战争在全球的迅速展开 ,以基地组织为代表的国际恐怖组织实施恐怖袭击的行动能力受到一定的削弱和限制。但同时 ,在世界各地尤其是中东、中亚等热点地区的恐怖事件却愈演愈烈 ,并且恐怖袭击的目标、采用的方式更趋于多样化、复杂化 ,造成的危害更加严重。     

Evaluating methods for the reliability of a large 2‐dimensional rectangular k‐within‐consecutive‐(r,s)‐out‐of‐(m,n):F system

A 2‐dimensional rectangular k‐within‐consecutive‐(r, s)‐out‐of‐(m, n):F system consists of m × n components, and fails if and only if k or more components fail in an r × s submatrix. This system can be treated as a reliability model for TFT liquid crystal displays, wireless communication networks, etc. Although an effective method has been developed for evaluating the exact system reliability of small or medium‐sized systems, that method needs extremely high computing time and memory capacity when applied to larger systems. Therefore, developing upper and lower bounds and accurate approximations for system reliability is useful for large systems. In this paper, first, we propose new upper and lower bounds for the reliability of a 2‐dimensional rectangular k‐within‐consecutive‐(r, s)‐out‐of‐(m, n):F system. Secondly, we propose two limit theorems for that system. With these theorems we can obtain accurate approximations for system reliabilities when the system is large and component reliabilities are close to one. © 2005 Wiley Periodicals, Inc. Naval Research Logistics, 2005     

Signature based analysis of m‐Consecutive‐k‐out‐of‐n: F systems with exchangeable components

In this article, we study reliability properties of m‐consecutive‐k‐out‐of‐n: F systems with exchangeable components. We deduce exact formulae and recurrence relations for the signature of the system. Closed form expressions for the survival function and the lifetime distribution as a mixture of the distribution of order statistics are established as well. These representations facilitate the computation of several reliability characteristics of the system for a given exchangeable joint distribution or survival function. Finally, we provide signature‐based stochastic ordering results for the system's lifetime and investigate the IFR preservation property under the formulation of m‐consecutive‐k‐out‐of‐n: F systems. © 2011 Wiley Periodicals, Inc. Naval Research Logistics, 2011     

受符号调制的m序列旁瓣特性研究

m序列因其优良的二值自相关特性而广泛应用于雷达和通信系统中。存在符号调制时 ,m序列匹配接收的旁瓣特性不再具有二值性。研究表明 :对于生成多项式相同的m序列 ,当移位寄存器的初始状态不同时 ,其符号调制下的旁瓣特性存在明显差异。选择合适的初始状态 ,可以得到较高的主旁瓣比。采用旁瓣抑制滤波器可以进一步显著提升主旁瓣比     

Reliability of a 2‐dimensional k‐within‐consecutive‐r × s‐out‐of‐m × n:F system

A 2‐dimensional rectangular (cylindrical) k‐within‐consecutive‐r × s‐out‐of‐m × n:F system is the rectangular (cylindrical) m × n‐system if the system fails whenever k components in a r × s‐submatrix fail. This paper proposes a recursive algorithm for the reliability of the 2‐dimensional k‐within‐consecutive‐r × s‐out‐m × n:F system, in the rectangular case and the cylindrical case. This algorithm requires min ( O (mk^r(n?s)), O (nk^s(m?r))), and O (mk^rn) computing time in the rectangular case and the cylindrical case, respectively. The proposed algorithm will be demonstrated and some numerical examples will be shown. © 2001 John Wiley & Sons, Inc. Naval Research Logistics 48: 625–637, 2001.     

浅谈成人高校后勤管理改革

当前成人高校的后勤存在的问题,决定必须对其进行改革,改革应遵循解放思想、实事求是的原则;因地、因校制宜的原则;坚持"三服务,两育人"的原则;维护学校稳定原则;集中统一、整体发展等原则.改革的根本途径在于后勤的社会化,其实质就是建立现代后勤制度.