运用组合公式求特殊级数的部分和

运用组合公式Cnk=Cn-kn,Ckn+1=Ckn+Ck-1n推导并证明了级数∞n=1∑n(n+1)…(n+k-1)(k∈N,k≥1)的前n项部分和的一般公式;同时给出了级数∞n=1∑nk(k∈N,k≥1前n项部分和的求法.     

南水北调中线工程与南阳市水资源可持续利用

介绍了南水北调中线工程概部及南阳市水资源开发利用现状，分析了工程对南阳市水资源与水环境的影响，在此基础上提出了我市水资源开发利用战略。     

安培环路定理的直接证明

给出了安培环路定理的一种证明方法。     

分布式电源对辐射状电网的电压影响性分析

随着电网智能化的发展,小容量的清洁分布式电源给电网带来的影响逐渐增大.对含分布式电源的等腰负荷模型进行电压影响性建模仿真,得出分布式电源并网位置及容量对电网电压的影响,并提出了考虑DG影响的配网电压控制原则.     

局域网故障分析

在详细分析了局域网出现故障的主要因素后,通过设计某些实例,提出了改善局域网络结构与性能的方法和途径,对局域网络的建设、投资、稳定和快速运行提供了可靠的依据。     

商务英语教学：语言教学和技能教学的平衡结合

尝试首次提出在商务英语教学中语言教学和技能教学的平衡结合,在此基础上分析平衡结合教学中存在的主要问题,从选用教材、教学方法以及建立校内外商务英语实训基地三个方面探讨了平衡结合教学的主要方法。     

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.     

行政公益诉讼制度之必要性探析——以自然法为视角

行政公益诉讼制度构建面临执行力弱、制度条件缺乏、心理消极暗示、诉权行使受限等窘境。自然法视角下的行政公益诉讼具有法律和社会的双重价值。对我国行政公益诉讼制度可从原告资格范围、被诉对象范围、举证责任分配等多方面着手进行构建与完善。     

信息获取技术的辨证唯物主义视角

运用辨证唯物主义的观点分析了信息获取技术的本质特征，阐述了其哲学基础，并导出几个对信息获取具有指导意义的结论。     

基于到达时间差的无线传感器网络中Sybil攻击检测方案

As wireless sensor networks （WSN） are deployed in fire monitoring, object tracking applications, security emerges as a central requirement. A case that Sybil node illegitimately reports messages to the master node with multiple non-existent identities （ID） will cause harmful effects on decision-making or resource allocation in these applications. In this paper, we present an efficient and lightweight solution for Sybil attack detection based on the time difference of arrival （TDOA） between the source node and beacon nodes. This solution can detect the existence of Sybil attacks, and locate the Sybil nodes. We demonstrate efficiency of the solution through experiments. The experiments show that this solution can detect all Sybil attack cases without missing.