RHS技术在舰载天线优化布局中的应用

针对舰载通信天线布置特性,综合应用典型启发式随机搜索技术(RHS)和数值仿真技术,对传统天线布局方法进行改进.以遗传算法为例,建立其与舰载天线优化布局的两类对应关系:天线优化布置参数与遗传算法特征值的关系;天线优化布置操作与遗传算子的关系.通过矩量法、多目标优化算法和权重系数变化法,对天线优化布局问题进行量化分析,解决了多参数协调控制复杂平台天线优化布局问题.在此基础上构造了一个具有理想导电面的舰船平台,以具体实例验证了理论模型的正确性.最终数值计算结果和试验结果符合较好,表明采用RHS技术获取的天线布局方案优于传统的天线布局方法,且可兼顾精度和效率.     

碳化硅零件氧化辅助抛光超精密加工的研究现状

通过等离子体氧化、热氧化、电化学氧化在碳化硅基材上获得软质氧化层,利用软磨粒抛光实现氧化物的快速去除,有利于提高材料去除效率、提升加工表面质量。研究发现,通过等离子体氧化辅助抛光,表面粗糙度RMS和Ra分别达到0.626nm和0.480nm;通过热氧化辅助抛光,表面粗糙度RMS和Ra分别达到0.920nm和0.726nm;在电化学氧化中,基于Deal-Grove模型计算得到的氧化速度为5.3nm/s,电化学氧化辅助抛光后的表面粗糙度RMS和Ra分别是4.428nm和3.453nm。氧化辅助抛光有助于烧结碳化硅加工工艺水平的提升,促进碳化硅零件在光学、陶瓷等领域的应用。     

A model-embedded trend test with incorporating Hardy-Weinberg equilibrium information

The genetic models are greatly important in the analysis of genetic epidemiologic studies and many of the studies are conducted using the trend test under the additive model. However, for many complex diseases and traits, the underlying genetic model for a genetic locus is usually uncertain. So a robust test free of genetic model is appropriate. In this paper, the authors propose a model-embedded trend test by incorporating Hardy-Weinberg equilibrium information and obtain the explicit formula to calculate its statistical significance. Extensive simulation studies show the proposed test is more robust than the existing procedures. Finally, a real application is further analyzed to show the performance of the proposed test.     

一类可测空间中随机扩散过程测度的绝对连续性与等价性

以随机过程理论为工具讨论了一类可测空间中随机扩散过程测度μξ与μＷ的绝对连续性与等价性，导出了若干满意论断与重要结果，从而可为解决未知参数估计的某些问题（如序贯估计）提供理论依据与方法．     

Preliminary Evaluation of a Candidate Multi-Epitope-Vaccine Against the Classical Swine Fever Virus

A multi-epitope-vaccine MEVABc consisting of two linear neutralizing determinants （BCI： aa693-716; A6： aa844-865） located on antigenic unit B/C and unit A of glycoprotein E2 was prepared to evaluate whether a combination strategy is effective in the design of peptide vaccines. After immunization, pig sera collected every one to two weeks were evaluated by enzyme linked immunosorbent assay. C-straininduced anti-sera and hyper-immune sera cannot recognize overlapping peptides that cover the E2 N-terminus, while MEVAgC is able to elicit high levels of peptide-specific antibody response. When compared with previously studied peptide vaccines PV-BC1 and PV-A6, the same dose of either component in the MEMABc increases the BC1- or A6-specific antibodies （to 1/3-1/2 of the levels of the separate vaccines）. However, the synergy between the antibodies may make MEVAgc much more potent. Moreover, anti-C-strain immunity pre-existing in pigs does not disturb the sequent MEVABc vaccination. Thus, MEVABc can be administrated to pigs which already possess anti-classical swine fever virus immunity. MEVAgC is a promising candidate marker vaccine.     

网络语言中的“XX体”现象分析

"XX体"是在互联网时代背景下催生出来的新的表达方式。这种网络流行体有四个显著特点:传播速度快,涉及领域广;语义大众化,流行性强;感情色彩丰富;话语模板固定。社会事件的引发、民众情绪的发泄和大众娱乐的需要是产生"XX体"的原因。对"XX体"现象的分析,有助于更加深刻地理解这一网络语言。     

基于地基承载力的砌体结构房屋基础外形分析

针对砌体结构房屋基础底面压应力的分布特点,分别采用独立基础并设置墙下地梁、条形基础矩形区域修正以及多边形区域的对称和不对称修正等四种基础外形方案,根据基础节点类型按地基承载力要求确定基础底面的合理修正范围,导出了修正系数的计算公式.所得结果表明,用独立基础代替条形基础,可显著降低工程造价;以条形基础为主进行局部修正时,“ ”型节点处修正最大,“^”型、“”型节点处应适当修正,“L”型节点处一般不必修正.该修正方法简便、实用,所得结果简单可靠,可直接用于基础设计.     

室内外因素对北京居室内PM10污染的影响研究

选取北京城区和郊区24户住宅,对室内和室外空气中PM_(10)进行同步数据采集,并结合《时间活动模式调查问卷》研究室内外PM_(10)污染特征。研究结果表明,2/3的居室在测试时间内PM_(10)日平均浓度超标;室内外PM_(10)具有显著正相关性;室内外温差和室外风速与室内PM_(10)均呈显著负相关,室外相对湿度与室内PM_(10)呈显著正相关。室内吸烟、手工打扫、机械打扫、蒸(焖)、炒(炸)和炖(熬)时段的I/O(室内/室外)比分别是夜间无明显活动时段的1.56~3.05倍,是白天无明显活动时段的1.02~1.49倍。应综合考虑室外污染状态、气象条件及室内人员活动状态采取措施降低居住建筑室内PM_(10)污染。     

切矩阵多项式插值的埃尔米特公式

研究带多重插值点的单切与双切矩阵多项式插值问题，推广经典矩阵多项式插值的埃尔米特公式和单重插值点情形双切矩阵多项式插值的拉格朗日公式。     

确定多头直廓环面蜗轮滚刀客屑槽数的一种方法

目前国内外资料介绍的关于直廓环面蜗轮滚刀容屑槽数选取准则，对多头小直径直廓环面蜗轮滚刀并非完全适用。本文提出了一种新的选取方法，可以有效地提高环面蜗轮齿面质量。