鲇鱼(Silurus asotus)产卵类型的研究

本文侧重研究了站鱼个体生殖力及产卵类型。结果表明：雌性个体1冬龄达性成熟,性腺一次成熟,卵子分批产出,产卵期是6—8月份,性成熟系数在7月份达高峰,8月份是产卵盛期,在产卵前的卵巢切片只发现有第4时相和第5时相卵母细胞,确定产卵类型为一次产卵。     

PSS码词组输入法及教学实践

本文介绍了PSS码（拼音、声调、首笔码）汉字输入法的词组编码及输入方法,并总结了PSS码作为一门选修课的教学效果。     

A gender comparison of HIV and drug use across the rural-urban continuum

Despite the central role of women drug users in escalating AIDS statistics, there is still a limited number of studies that examine the roles of gender and drug use type in HIV seroprevalence. This lacuna in the research literature has led to significant gaps in researchers' understanding of how and to what extent women may differ in their drug-using and HIV risk behaviors compared to their better-studied male counterparts. This study, derived from a sample of 3,555 out-of-treatment drug users residing in three South Florida urban and rural communities, attempts to compare the drug usage and needle and sexual risk behaviors of male and female drug users that put them at risk for HIV infection. The overall seropositivity rate for women drug users was 26.5% compared to 19.5% for their male counterparts. Results of multivariate analyses indicate that females compared to males were 1.4 times more likely to be HIV seropositive. Risk behaviors associated with this elevated seropositivity include living arrangements, homeless status, drug use, sexual trading behaviors, and history of STDs. Furthermore, there was a strong linear relationship between drug use type and HIV seroprevalence among women drug users. Compared to those who were neither crack smokers nor injectors of illicit drugs, those who were crack smokers only were 2 times more likely to be HIV seropositive, while those who were both crack smokers and injectors were 5 times more likely to be HIV seropositive, and those who were injectors only were 6 times more likely to be HIV seropositive. These findings indicate that among women, drug abuse and its associated risk behaviors, increase the vulnerability of this population for HIV and thus render them an extremely important priority population on which to focus HIV prevention and public health efforts and programs.     

高管层团队人口特征与公司业绩关系的实证研究

以沪深两市156家上市公司为研究样本,考察了我国企业高层管理团队人口特征与组织绩效之间的关系。研究发现,我国上市公司高管人员管理背景的多样性和平均年龄对企业业绩有显著的促进作用,但高管团队平均学历水平及学历水平的差异性对企业业绩的影响不显著。     

浅析经济新闻的民生视角

随着我国市场经济的迅猛发展并趋于成熟,经济新闻越来越为人们所关注、重视。目前中国政府提出"改善民生",为"民生视角"的新闻报道提供了大量素材和广泛受众。大势所趋,媒体应以"民生视角"来报道经济新闻。电视民生新闻的崛起为"民生视角"的广播报道提供了借鉴。而"小角度"报道、"百姓立场"关注、"零距离"解读和"大容量"覆盖则是可行的方式。     

论北宋天圣年间四川仕风的嬗变——三苏文章汇入北宋古文运动的地域背景

北宋天圣以前川民「怀土罕趋仕进」。天圣以后,「应时务用」的观念成为了时代的主导观念,因而促成了「通经学古,以西汉文词为宗师」的蜀学汇入时代的主流。这是三苏文章与欧阳修古文革新思想合拍的重要背景。     

求解非线性二层规划问题的模拟植物生长算法

本文以植物向光性生长理论为启发式准则,提出了一种求解非线性二层规划问题的智能优化算法。在该算法中,将二层规划上层解空间和下层反应集分别作为植物的两个生长环境,建立以生长规则为基础的植物系统演绎方式和以植物向光性理论为基础的概率生长模型,两者结合所形成的优化模式,实现了模拟植物从初始状态到完整形式的终态(没有新的树枝生长),从而得到二层规划问题的解。该方法具有搜索精度较高,求解稳定性较强的特点,通过与国外学者在非线性二层规划实际测试问题的最优值进行精度比较,表明模拟植物生长算法是有效可行的。     

基于VaR风险控制的半log-最优资产组合模型

通过建立基于VaR风险控制下的单周期半log-最优资产组合数学模型,证明了最优解的存在性与唯一性。利用遗传算法对半log-最优资产组合模型进行了实例计算与分析,并与log-最优资产组合模型进行了比较,结果表明半log-最优资产组合模型具有计算方便的特征。     

数字电视视频压缩标准

简述MPEG、JPEG与H系列图像压缩编码国际标准中与高清晰度数字电视视频相关的编码技术,并指出各自的特点、性能与应用。     

县域经济产业协同成熟度分析与研究

县域产业部门的产值结构、资产结构和就业结构是县域产业结构表现的不同侧面。资产结构和就业结构的形态决定产值结构,产值结构是资产和就业结构的映射。因此,县域经济产业协同成熟度也是产值结构、资产结构和就业结构等因素之间的协同度。运用灰色关联分析研究产值结构与就业结构、资产结构的协同问题,构造分析县域产值结构与就业结构、资产结构关联度的方法,为县域就业结构与资产结构调整以促进产业结构优化提供分析工具,并搜集山东省邹平县的数据进行了实证分析。