基于模糊神经网络防空重点保卫目标的选择

在现代防空中,由于精确制导技术在空袭兵器上的应用,使防空中重点掩护显得格外重要。为实现重点掩护,防空中重点保卫目标的选择就成了防空作战系统分析首要环节。本文给出了重点保卫目标类型,提出了选择重点保卫目标的指标,利用多目标权系数的不确定特点,建立了优选保卫目标的模糊神经网络模型及算法。最后对给出的保卫目标样本对模糊神经网络模型进行训练和仿真,说明了用该模型能很好的选择重点保卫目标。     

区域防空部署射击效能评估模型

针对区域防空部署的特点,提出了异型防空武器归一化的处理方法。在方位拦截扇区划分的基础上,区分了两种类型的随机服务系统,运用排队理论分别计算每个方位拦截扇区的射击效能,最后依据目标流在各个方位扇面上的进袭概率,加权综合计算出区域防空部署的射击效能。该模型可为区域防空部署方案的决策与分析提供科学依据。     

Cardenolide glycosides from the adults and eggs ofChrysolina fuliginosa (Coleoptera: Chrysomelidae)

Besides the known sarmentogenin 3-O--D-allopyranoside (1) and digitoxigenin-3-O-[-D-xylopyranosyl-(14)-2, 3-di-O-acetyl--D-allopyranoside] (4), four new cardiac glycosides (2, 3, 5 and6) have been isolated from the defensive glands of adults ofChrysolina fuliginosa. The structures of the new compounds were determined by¹H NMR at 600 MHz and FABMS. Compounds1–6, present in the adults ofC. fuliginosa, have also been identified in the eggs.     

Cationic host defence peptides: Innate immune regulatory peptides as a novel approach for treating infections

An increase in antibiotic resistance and the emergence of new pathogens has led to an urgent need for alternative approaches to infection management. Immunomodulatory molecules that do not target the pathogen directly, but rather selectively enhance and/or alter host defence mechanisms, are attractive candidates for therapeutic development. Natural cationic host defence peptides represent lead molecules that boost innate immune responses and selectively modulate pathogen-induced inflammatory responses. This review discusses recent evidence exploring the mechanisms of cationic host defence peptides as innate immune regulators, their role in the interface of innate and adaptive immunity, and their potential application as beneficial therapeutics in overcoming infectious diseases. Received 3 November 2006; received after revision 14 December 2006; accepted 22 January 2007     

Plants are better protected against spider-mites after exposure to volatiles from infested conspecifics

When infested by herbivorous mites, cotton seedlings produce volatile cues that elicit attraction of predatory mites. Experiments were carried out to elucidate how downwinduninfested conspecific seedlings are affected by these volatiles. It was found that the rate of oviposition of herbivorous mites was reduced on seedlings exposed to volatiles from infested seedlings. Moreover, predatory mites were attracted by exposeduninfested seedlings. These results strongly suggest that uninfested plants are better protected against herbivore attack when exposed to airborne chemicals released by their infested neighbours.     

影响我国男子篮球防守问题的探讨

从多次国际男篮大赛可以看出我国男篮的防守与国际水平相关悬殊,本文通过对影响我国男篮防守的几个因素进行分析研究,提出合理化建议。     

防空C~3I系统的实时数据库系统

本文讨论了防空C~3I系统作战实时数据库的数据结构,提出了一套适应作战数据库管理系统的设计思想和算法。简述了数据库系统的设计过程,并分析了数据库系统的实时性和有效性。     

BP网络在防空导弹采购费用研究中的应用

首先介绍了费用估算的常用方法和人工神经网络的基本概念、原理 ,然后提出了一种基于BP(BackPropagation)神经网络的防空导弹采购费估算模型 ,并对典型的防空导弹采购费进行了估算。结果表明 ,该方法是有效的、可行的。     

重要交通设施一体化防护系统分析

提出了建立集威胁探测与告警、信息融合与数据处理及各种对抗措施于一体的一体化防护系统。该系统应具有合同性、快速反应性、机动性以及构成的模块化和智能化的特点。详细阐述了该系统的逻辑结构、效果评价方法和量化标准 ,并可根据防护概率优选、优化防护手段。由于一体化防护系统对交通目标的防护具有主动性、实时性和针对性 ,因而可大大提高重要交通设施在战争中的生存能力。     

悬板式防爆波活门关闭风量机理

针对工程中悬板活门应用和空气流动作用理论研究的不足,建立了悬板活门动作力学模型和空气流动动力学模型,并通过关闭风量方程组加以求解,得到了悬板活门的动作规律和空气流动特性。分析了悬板式防爆波活门关闭风量和通风特性与活门结构参数变化的内在联系。选择3个规格的悬板活门,测量其关闭风量,将理论值与测量值进行比较,计算偏差。结果表明,根据方程组计算的关闭风量与实测风量的偏差较小,均在10%内,且随着活门规格的增加,此偏差逐渐降低,理论与实际情况趋于吻合。