一类具阶段结构和比率依赖功能性反应滞后捕食模型的稳定性和Hopf分支

研究一类具阶段结构和比率依赖功能性反应的滞后捕食模型.通过分析特征方程,讨论了系统各个可行平衡点的局部稳定性,得到了系统Hopf分支存在的充分条件;利用单调迭代法和比较定理分别得到了正平衡点全局吸引和边界平衡点全局渐近稳定的充分条件.     

基于势流理论的浮式潮流能电站载体耐波性分析

基于三维势流理论,考虑水轮机对载体的影响,运用Hydrostar计算评估某浮式潮流电站载体的耐波陛．并结合潮流电站工作当地极限海况,对该载体的耐波性进行短期预报．计算结果表明,该潮流电站浮式载体横浪状态下横摇响应大;在迎浪状态下,潮流电站浮式载体最容易甲板上浪．     

进化BP神经网络的围岩位移预测

利用遗传算法,在BP神经网络模型的基础上, 从连接权、网络结构和学习参数等三方面进行了进化,得到了进化BP神经网络模型,并在VC 6.0平台的基础上自主开发了遗传算法进化BP神经网络预测系统,且采用十进制编码.将该系统运用于通渝隧道围岩预测中,其预测结果表明,进化的BP神经网络模型在训练时的迭代次数比未进化的BP神经网络模型下降了约9倍,提高了运算的效率,其预测结果也较准确.     

地月转移轨道的Vinti多圆锥截线轨道预报方法

采用解析法近似、快速地预报地月转移轨道,对月球探测器的任务分析和轨道设计具有重要意义。已有的近似解析算法未考虑地球扁率影响,造成误差扩散,影响预报精度。本文给出一种新的快速准确预报地月转移轨道的解析算法,采用Vinti法对地月转移轨道的近地段进行扁率修正,采用多圆锥截线法预报地月转移轨道;讨论了算法中扁率修正时间长度和多圆锥截线变步长策略的选取,比较了多种典型地月转移轨道的预报方法精度与速度。与精确数值积分方法相比,新解析算法的计算速度快3个数量级,并且近月点位置的预报误差小于100km。     

北洺河铁矿开采沉陷预计及地表变形监测与分析

根据北洺河铁矿覆岩整体性差的特点,将基于地理信息系统(GIS)和概率积分法的MSDAS-GIS系统应用于采用无底柱分段崩落法的金属矿山的开采沉陷预计.通过GIS建模全面反映矿区的三维地理、地质信息及其内在属性,利用GIS的空间分析和图形显示功能对理论预计结果和现场监测结果进行综合分析,从而直观反映出开采沉陷对周围环境的影响程度及范围.     

Stepwise prediction and statistical screening: B-cell epitopes on neuraminidase of human avian H5N1 virus

The B-cell epitopes of virus are associated with the antiviral drug and the vaccine screening. As the nucleotide sequences of neuraminidase （NA） of stain GD-01-06 were sequenced, we predicted the a-helix and β-fold structure and the indexes of the flexible regions of secondary structure of NA with methods of the Hydrophilicity plot by Kyte-Doolittle, the Surface probability plot by Emini and the An- tigenic index by Jameson-Wolf, and then screened statistically the parameters to predict B-cell epi- topes by the Hierarchical cluster and the Bivariate correlation and the quartiles with SPSS 13.0. The impact of variation of amino acids in NA on its epitopes was analyzed. The predictive results were evaluated by Wu＇s Antigenic Index and SWISS-MODEL. We found that the most possible epitopes on NA were located within or nearby its N-terminal Nos. 120--137, 81--84, 408--415, 273--282, 429--432, 356--368, 46--55, 146--155, 341 --350 and 198--209, which were the dominant regions of NA epitopes. Peptide 120--137 including the glycoprotein domain （NGT126 128） was first chosen as the B-cell epitopes on NA. NA in H5N1 strain isolated after 2003 lacked in No. 53 amino acid （I）, resulting in an increase in the surface flexible region of NA in GD-01-06 and an enlargement to their epitope regions （VEP48-48→ VEPISNTNFL46-55）. Conclusively, prediction of the B-cell epitopes on the NA based on multiple pa- rameters is useful for researches on the molecular immunology and drug screening and immuno-prophylaxis. A deletion of No. 53 amino acid （I） in NA in strain GD-01-06 might increase its anti- genicity.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

早期美国来华传教士笔下的“中国形象”

美国对华传教工作始于1829年。美国来华传教士雅裨理和卫三畏分别于1830年与1833年来华。鸦片战争之前,由于清政府严格限制对外交往,来华传教士的活动范围受到限制,因此他们对中国的理解是比较肤浅的。在他们眼中,中国是个奇风异俗盛行的异教国度,是个等待西方“先进”文明与宗教拯救的民族。他们用文字记录了来华美国人对中国的最初印象,这些印象也成为此后美国人中国观的最初依据。     

基督新教对美国早期政治的积极影响

美国政教分离制度的建立封堵了国家政权干预宗教传播与信教自由的渠道,却并未束缚宗教对政治的关注和影响。基督新教在不受政权干预的背景下参与政治生活,对美国早期政治、自由民主产生了积极影响。     

DNA序列特征提取方法研究

针对DNA序列分类问题提出了两种特征提取方法,利用可分支持向量分类机间隔大、推广能力强的原理建立了DNA序列特征提取方法优劣的评价标准,利用该标准把本文的两种特征提取方法进行了比较,且跟以往的DNA序列特征提取方法进行了比较.实验表明,提出的两种特征方法得到的DNA序列特征完全能够代表DNA序列,对已知分类样本的预测率为100%,且此特征提取方法有很强的推广能力.