关于孪生素数猜想证明的探讨

孪生素数猜想 ,即孪生素数是否无穷多 [1] ,是数论三大问题之一 .“所谓数论三大问题就是费尔马问题、孪生素数问题和哥德巴赫猜想 [1]” .我们在前人研究的基础上 ,先找出了勾股数组的排列顺序表[2 ] ,从中发现了大于 2的素数表达式 [3]和孪生素数的表达式 [4 ] ,在 [2 ]、[3]、[4 ]研究的基础上本文对孪生素数猜想证明做了进一步的探讨     

基于NSCT的图像消噪研究

针对CT变换缺少平移不变性会在图像消噪时产生伪Gibbs现象,提出了非下采样CT变换与自适应阈值法相结合的图像消噪法。实验结果表明,采用非下采样CT变换方法能有效地消除图像噪声,保存图像的纹理细节,提升图像信噪比,消噪效果优于传统小波及CT消噪效果。     

植被生态需水研究进展及展望

生态需水研究是目前生态学和水文学、水资源学研究的热点领域.植被生态需水研究不仅是其中的重要研究内容,而且对于指导区域植被生态恢复与生态建设也具有重要意义.本文在调研有关研究文献的基础上,对植被生态需水的概念与内涵、计算方法进行了分析.认为植被生态需水是指为了保证植被生态系统能够健康维持,并确保其生态服务功能得到正常发挥而必须消耗的一部分水量.在区域植被生态需水量的计算中,最关键的是对单位面积、单位时间内某一植被类型生态需水定额的确定,目前常用的计算方法多是基于农业气象学原理的直接计算法.     

Early Head Start Relationships: Association with Program Outcomes

Research Findings: Interpersonal relationships among staff caregivers, parents, and children have been recommended as essential aspects of early childhood intervention. This study explored the associations of these relationships with program outcomes for children and parents in 3 Early Head Start programs. A total of 71 children (8–35 months, M = 20), their parents, and 33 program caregivers participated. The results showed that caregiver–child relationships were moderately positive, secure, and interactive and improved in quality over 6 months, whereas caregiver–parent relationships were generally positive and temporally stable. Caregiver–child relationships were more positive for girls, younger children, and those in home-visiting programs. Caregiver–parent relationships were more positive when parents had higher education levels and when staff had more years of experience, had more positive work environments, or had attained a Child Development Associate credential or associate's level of education rather than a 4-year academic degree. Hierarchical linear modeling analysis suggested that the quality of the caregiver–parent relationship was a stronger predictor of both child and parent outcomes than was the quality of the caregiver–child relationship. There were also moderation effects: Stronger associations of caregiver–parent relationships with observed positive parenting were seen in parents with lower education levels and when program caregivers had higher levels of education. Practice or Policy: The results support the importance of caregiver–family relationships in early intervention programs and suggest that staff need to be prepared to build relationships with children and families in individualized ways. Limitations of this study and implications for program improvements and future research are discussed.     

非负定方差阵下的证券组合投资决策模型研究

在用于度量投资风险的方差阵为非负定时，本文建立并研究了允许卖空与不允许卖空情形下证券组合投资决策模型，同时给出了计算最优投资比例系数的方法。     

基于Origin的光学实验计算机仿真

以多缝衍射实验为例,介绍利用Origin实现光学实验计算机仿真的方法。此新方法实现过程简易,可以得到细致逼真的仿真图样和任意方向的光强分布曲线,适合推广到多个光学实验的计算机仿真中,为光学的理论分析与实验教学提供方便。     

基于高职院校思想政治理论课视角的大学生道德人格培养

大学生道德人格教育在高职院校思想政治教育中占有重要地位。高职院校思想政治理论课作为对高职院校学生进行思想政治教育的主渠道,与学生道德人格的培养有着密切关系。当前高职院校思想政治理论课尚未充分发挥其在培养学生健康道德人格方面的重要影响力。高职院校思想政治课应当努力探索改进大学生道德人格教育的途径和方法,培养具有健全人格的高素质人才。     

云烟85种子萌发过程物质消耗研究

以烤烟品种云烟85种子为实验材料,从种子吸水前0h和吸水后的24h,48h,72h,96h,120h,144h,168h分8个时期分析了烟草种子萌发时各种养分的动态变化.结果表明:种子萌发至168h时,种子内可溶性总糖和还原糖含量达最大值,随后可溶性总糖和还原糖含量均维持在一个稳定的水平;种子萌发至24h时,种子内的蛋白质含量开始下降,至168h时达到最低;种子萌发至72h时,种子内的粗脂肪含量开始下降,至168h时达到最低.     

知识共享的障碍因素分析

分别从组成知识共享活动的四个方面,即知识共享的主体、对象、手段和环境着手,依次对影响知识共享活动的障碍因素进行了分析。通过这种比较系统的分析,可以使人们对知识共享活动中的障碍因素有一个比较全面和清楚的认识,从而采取相应的对策,对其加以克服,以保障知识共享活动的顺利进行。     

作为情报源的报纸及其参考价值不可忽视

分析报纸情报源的现状、特点,尤其在网络环境下所呈现的优势、参考价值,认为报纸在学术研究中的作用不可忽视.