关于长尾式差分放大电路静态分析中的一些问题

从长尾式差分放大电路的直流等效电路出发，利用戴文宁定理，分析了电路中基极偏流电阻及信号源内阻对静态工作点的影响。     

The influence of support and stress on maternal attitudes

OBJECTIVES: This study examines an expanded version of Belsky's (1984) multi-dimensional process model of parenting to determine whether changes in stress and support influence maternal attitudes during the first year of a child's life. METHOD: Data were collected from mothers of newborns eligible for Hawaii's Healthy Start program who had been randomly assigned to home visitation (n=108) or control (n=104) status. Multiple regression analyses were used to test hypotheses regarding the influence of change in contextual sources of support and stress on parenting attitudes as measured by the Child Abuse Potential Inventory (CAPI) Abuse Scale. A post hoc analysis of variance was conducted to explore interactions among the predictor variables and home visitation. RESULTS: Stress in the form of change in public assistance status led to more punitive parenting attitudes while increased support from the partner and from close associates emerged as significant predictors of less punitive parental attitudes. The exploratory analyses suggest that home visitation may moderate the impacts of stress and support on maternal attitudes. CONCLUSIONS: In line with Belsky's (1984) process model of parenting, increased stress adversely impacted maternal attitudes regarding physical punishment while increased support exerted favorable effects. The results also support further elaboration of Belsky's model including the expansion of marital support to include unmarried partners and the need to consider the impact of formal support sources on parenting.     

n星形联接无耦合电感网格与网形电感网络的等效变换

中提出动态网络分析中包含n星形联接的电感网络，可用等效变换法将其用网形电感网络来代换，并给出等效变换的方法，进而消去了电路中的星形电感割集。     

当今大学生体育动机的调查研究

通过对高校大学生体育动机的调查，意在了解当代大学生体育动机现状，分析体育动机与体育行为、体育动机与体育效果的互相关系，探索体育动机激发的手段和体育教学改革的途径。     

我国产业结构调整的方针、障碍及对策分析

培育和发展高新技术产业、改造传统产业、淘汰落后产业是目前我国产业结构调整的战略方针。由于资金短缺、保护主义、原有制度惯性以及市场机制不完善等因素，致使产业政策在现实中很难顺利实施。为此，必须通过加大资金投入、规范地方政府行为、健全社会保障体制和寒冷市场机制等途径，消除障碍，以加快产业调整步伐。     

注重“双基” 突出能力—山西省2002年中考化学试题说明

~~应原理、实验过程及实验现象有机地融为一体。4 .增设了简答题和开放性试题 ,旨在考查学生的创新精神及综合能力。33题让学生选用不同的试剂 ,用两种不同的方法把稀硫酸、氢氧化钠、氢氧化钙三瓶无色溶液区别开来。此题全面综合考查了学生的化学知识、实验技能、逻辑思维能力、思维过程及必备的文字表达能力。这种过程开放的试题能创设学生积极探究问题的情景 ,鼓励学生从不同角度、不同层面上去思考问题 ,有助于充分调动学生的潜在能力。5 .重视基本原理的考查 ,提高学生的科学素养。根据《国家基础课程改革指导纲要》精神 ,由教育部制定…     

广义分式规划的Dinkelbach型算法

考虑紧集情况下，广义分式规划问题（P）的Dinkelbach型算法，并证明了该算法的收敛性。     

数据库加密体制

利用多项式环上的孙子定理建立了一数据库加密体制，其特点是速度快、易实现。