网络化防空系统研究

网络化防空系统是“网络中心战”与防空作战结合的产物,是防空系统发展的趋势.文中描述了网络化防空系统的优越性,研究了网络化防空系统的体系结构及相关问题,并分析了网络化防空中网络组织结构及指控网、探测网和武器网的协同关系,提出了网络化防空系统中的网络拓扑发现算法和系统体系结构设计方法的基本思路.     

基于新生成器结构的图像修复方法

针对目前图像修复算法存在的修复效果不连续、缺失大小受限、训练过程不稳定等缺点,提出了一种基于生成对抗网络的图像修复方法.利用卷积神经网络,我们可以真实地修复任意分辨率的图像.为了实现高分辨率的真实修复效果和对图像特征的充分学习,我们提出基于DenseNet传播源图像的细节和结构得到高分辨率的图像,实现图像缺失生成;由于Iizuka等人提出的基于双判别器方法中膨胀卷积部分所产生的巨大运算量,我们提出使用JPU (Joint Pyramid Upsampling,联合金字塔上采样)来加速计算.在CelebA和ImageNet上的实验表明,所提方法能真实地修复大多数的破损图像.     

公平与效率关系问题探讨

对公平与效率关系问题的探讨,研究者一般以两者是一对矛盾展开,这是片面的。实际上,公平与效率是完全可以统一的。本文在分析传统片面认识的基础上,从长远的、整体的、辩证的视角探讨了公平与效率的问题。     

Effects Of Tree Phytochemistry On The Interactions Among Endophloedic Fungi Associated With The Southern Pine Beetle

We examined the interaction between host trees and fungi associated with a tree-killing bark beetle, Dendroctonus frontalis. We evaluated (1) the response of four Pinus species to fungal invasion and (2) the effects of plant secondary metabolites on primary growth of and secondary colonization of three consistent fungal associates. Two of these fungi, Entomocorticium sp. A and Ophiostoma ranaculosum, are obligate mutualists with D. frontalis, and the third associate is a blue-staining fungus, O. minus, that is commonly introduced by beetles and phoretic mites. O. minus negatively affects beetle larvae and in high abundance can impact D. frontalispopulation dynamics. Size of lesions formed and quantity of secondary metabolites produced in response to fungal inoculations varied significantly among Pinus species. However, monoterpene composition within infected tissue did not significantly vary across treatments. While all eight tested metabolites negatively affected the growth rate of O. minus, only 4-allylanisole, p-cymene, and terpinene reduced the growth of the mycangial fungi. Surprisingly, growth rates of mycangial fungi increased in the presence of several secondary metabolite volatiles. O. minus out-competed both mycangial fungi, but the presence of secondary metabolites altered the outcome slightly. O. ranaculosum out-performed E. sp. A in the presence of dominant conifer monoterpenes, such as - and -pinene. Volatiles from the mycangial fungi, particularly E. sp. A, had a negative effect on O. minus growth. In general, phloem phytochemistry of particular Pinus species appeared to alter the relative growth and competitiveness of mutualistic and non-mutualistic fungi associated with D. frontalis. The outcome of interactions among these fungi likely has important consequences for the population dynamics of D. frontalis.     

Dopamine D1 and D2 Receptor Antagonism in the Preoptic Area Produces Different Effects on Maternal Behavior in Lactating Rats.

The preoptic area (POA) is critical for maternal behavior in rats but little is known about what neurotransmitters released here influence maternal responding. POA infusion of 10 μg (but not 2 μg) of the dopamine D1 receptor antagonist SCH-23390 greatly impaired retrieval and licking of pups but not other maternal or nonmaternal behaviors in lactating rats. In contrast, POA infusion of 10 μg (but not 2 μg) of the D2 receptor antagonist raclopride facilitated nursing but did not affect oral maternal behaviors. SCH-23390 in the medial hypothalamus tended to impair licking but not retrieval. Raclopride in the medial hypothalamus had no effects. Therefore, D1 and D2 receptor activity, particularly in the POA, is important for regulating different maternal behaviors. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

烟草黑胫病拮抗放线菌的分离与筛选

从堆沤过圈肥的土壤中采集样品,用平板法对所采样品进行菌株分离、纯化培养,共获得原始放线菌101株,再通过室内拮抗试验,从随机28株试验菌株中初步获得16株具有一定拮抗作用的菌株。对拮抗效果较好的6株菌株以及抑菌圈较小、但其菌落较大的A15菌株进一步做盆栽防治试验。结果表明,A6的防治效果最好,达到55.26%,其它菌株效果一般。     

Molecular identification of naturally occurring bacteriocinogenic and bacteriocinogenic-like lactic acid bacteria in raw milk and soft cheese

Lactic acid bacteria (LAB) are currently used by food industries because of their ability to produce metabolites with antimicrobial activity against gram-positive pathogens and spoilage microorganisms. The objectives of this study were to identify naturally occurring bacteriocinogenic or bacteriocinogenic-like LAB in raw milk and soft cheese and to detect the presence of nisin-coding genes in cultures identified as Lactococcus lactis. Lactic acid bacteria cultures were isolated from 389 raw milk and soft cheese samples and were later characterized for the production of antimicrobial substances against Listeria monocytogenes. Of these, 58 (14.9%) LAB cultures were identified as antagonistic; the nature of this antagonistic activity was then characterized via enzymatic tests to confirm the proteinaceous nature of the antimicrobial substances. In addition, 20 of these antagonistic cultures were selected and submitted to genetic sequencing; they were identified as Lactobacillus plantarum (n = 2) and Lactococcus lactis ssp. lactis (n = 18). Nisin genes were identified by polymerase chain reaction in 7 of these cultures. The identified bacteriocinogenic and bacteriocinogenic-like cultures were highly variable concerning the production and activity of antimicrobial substances, even when they were genetically similar. The obtained results indicated the need for molecular and phenotypic methodologies to properly characterize bacteriocinogenic LAB, as well as the potential use of these cultures as tools to provide food safety.     

纳秒激光主动成像侦察系统研究

通过对激光主动成像侦察的原理进行介绍和对实战要求进行分析,设计了纳秒激光主动成像侦察系统并成功进行了系统功能模拟实验.实验结果表明,该系统可以利用波长为1.06 μm的纳秒激光实现主动成像,能够达到隐蔽侦察战场的目的.该系统的研究对于战场主动侦察和目标跟踪、瞄准都有十分重要的意义.     

基于220C协议的无线分组网络安全机制

对无线分组协议MIL-STD 188-220C中的安全问题进行探讨,通过分析DAP-NAD 算法的工作原理,利用排队论的内容从算法的信道分配过程中提取一种非强占优先的M/G/1的排队模型,通过模型分析指出算法存在的安全隐患,并据此提出一种可能的攻击算法以验证其安全机制的不足。在仿真平台下搭建遵循DAP-NAD算法无线网络模型,通过运行攻击算法前后网络性能产生的变化,指出DAP-NAD 算法的消息优先级机制的安全隐患及可能的对抗机制。     

多黄酮混合物抗氧化活性的协同与拮抗作用

以DPPH自由基清除能力、•OH清除能力、总抗氧化性、还原能力等不同机理的氧化还原反应为评价指标,分析7种黄酮类化合物中的3 种以质量比1∶1∶1混合后,混合物体外抗氧化活性的协同与拮抗作用;用高效液相色谱（high-performance liquid chromatography,HPLC）测定黄酮两两混合物与DPPH自由基反应过程中的结构变化。结果表明：4-羰基与2,3-双键对多黄酮混合物相互作用的影响大于B环邻二羟基,B环邻二羟基对多黄酮混合物相互作用的影响大于B环仅有一个酚羟基的结构。黄酮之间相互作用的发生,与氧化还原反应中氧化剂的比例和反应时间有关,只有当氧化剂比例以及反应时间达到某一程度,黄酮之间的相互作用才开始发生。在此之前,抗氧化性更强的黄酮组分先被氧化。