汽车发动机管理系统高寒标定     

杨梅 《北京工业职业技术学院学报》2008,7(3):73-77

发动机电控管理系统经过细致的整车匹配标定,能够使汽车在行驶性、燃油经济性和排放性能等诸方面均有明显改善。“高寒试验”是汽车发动机电控系统标定中的一项重要环节,可以确保汽车满足低温环境下的启动和驾驶等方面的性能要求。  相似文献   

研究钱在哪儿?     

《海外英语》2007,(1):56

IF you fancy yourself as a globetrotting executive it makes sense to start as you mean to go on and hop on a plane to a business school. You can absorb a range of cultural experiences while gaining your MBA-what is more, it can be cheaper than studying at home.  相似文献   

Promoting Parents' Social Capital to Increase Children's Attendance in Head Start: Evidence From an Experimental Intervention     

Teresa Eckrich Sommer  Terri J. Sabol  P. Lindsay Chase-Lansdale  Mario Small  Henry Wilde  Sean Brown 《Journal of research on educational effectiveness》2017,10(4):732-766

Improving children's attendance is a high priority for Head Start and other early childhood education programs serving low-income children. We conducted a randomized control trial in a major northern city to evaluate the impact of a low-cost intervention designed to promote parents' social capital as a potential influence on children's attendance in Head Start centers. The intervention assigned children to treatment group classrooms based on (a) neighborhood of residence (geography condition) or (b) the geography condition plus the opportunity for parents to form partnerships in support of their children's attendance, or to control group classrooms according to Head Start guidelines only. We did not find impacts on average attendance throughout the year. However, the intervention did lead to increased attendance during the winter when average center attendance was lowest. There were no impacts on fall or spring attendance. Follow-up exploratory analyses of focus groups with parents and staff suggested that parents' level of connection and trust, self-generated partnership strategies, and commitment to their children's education may be factors by which parents' social capital expands and children's attendance improves.  相似文献   

合理配置人才 促进图书馆改革与发展   总被引：1，自引：0，他引：1  

李长信  邸铭 《情报科学》2002,20(1):35-36

本文阐述了馆长在图书馆工作中的地位、作用，并对优秀馆长所应具备的素质和选拔任用做了探讨。同时谈到部分图书馆人才结构失调的原因、现状，提出优化人才结构及适应图书馆的具体措施。  相似文献   

2008年全国游泳冠军赛接力项目接跳技术分析     

杨红春  毛旭江  石锴  宋福康 《浙江体育科学》2010,32(2):97-99,116

通过对2008年全国游泳冠军赛接力项目全部参赛队的预、决赛反应时间、接跳时间的统计分析,发现参赛运动队总体接跳时间较2001年时有明显进步。各队之间反应时间没有差异,提示不同代表队之间接跳水平时间的差异源于对接跳技术的科研重视及专项训练。建议运动队训练运动员采用出发动量较大的后环绕摆臂或后倾蹲踞式接力出发技术,并进行充分的接跳配合训练。  相似文献   

推进欠发达地区返乡农民工创业的对策探讨   总被引：1，自引：0，他引：1  

涂平荣  周素琴 《常熟理工学院学报》2009,23(11):38-41

受历史原因和现实条件影响,当前欠发达地区返乡农民工创业中困境颇多。针对这种现状,可通过统筹城乡创业服务平台,改善农民工创业环境;强化农村创业信息化建设,提高农民工创业质量;加大农村创业资金的扶持力度,拓宽农民工创业融资渠道;全面提高农民综合素质,提升农民工创业能力等四条对策来逐步摆脱返乡农民工创业困境。长效推进农民工返乡创业。  相似文献   

基于瓶颈制约下的大学生创业模式探析     

刘建荣  于勇 《赣南师范学院学报》2009,30(4):119-121

当前的金融危机导致越来越多的大学生步入就业"新盲流"行列。我国大学生创业经历了20多年的发展历程,创业模式也在不断地丰富,每种创业模式形成了各自的特点,但创业模式存在着创业主体思维、背景、能力等方面的制约因素。大学生必须注意创业模式的选择和创业能力的培养。  相似文献   

单片机在电动机软起动中应用     

王辉 《淮南职业技术学院学报》2009,9(3):25-27

近几年来,单片机已经被认为在现代文明和技术发展与进步中,起着越来越重要的作用;工业上,单片机技术有着广泛的应用,针对其应用的越来越广泛,提出了利用面向对象技术设计的方法,并将其用于以intel16位系列单片机8098为中央处理单元的电子软设计中;因为三相交流异步电动机启动电流过大,易烧毁或损坏电机,基于单片机系统、集成芯片和可控硅为辅助,提出了三相晶闸管交流调压的数字移相控制方法,通过控制触发角来控制输出电压,从而降低电动机的启动电流,使安全稳定的启动。这种方法具有其特点.即达到了延长异步电动机使用寿命的目的,具有故障显示及自诊断功能。  相似文献   

Ethnic group differences in early head start parents’ parenting beliefs and practices and links to children's early cognitive development     

Micere Keels 《Early childhood research quarterly》2009

Data from the Early Head Start Research and Evaluation study were used to examine the extent to which several factors mediate between- and within-ethnic-group differences in parenting beliefs and behaviors, and children's early cognitive development (analysis sample of 1198 families). The findings indicate that Hispanic-, European-, and African-Americans differ significantly in their parenting beliefs and behaviors. Children also evidence significant ethnic group differences in 24-month cognitive development; these differences were fully accounted for by controlling for maternal cognitive skills, as measured by lexical knowledge. In comparison, maternal parenting behaviors were only a partial mediator of ethnic group differences in children's cognitive development. Structural equation modeling was used to examine, within each ethnic group, the extent to which measured parenting beliefs and behaviors mediate the effect of maternal cognitive skills on children's early cognitive development. Analyses show that the mediated path from maternal cognitive skills to child cognitive development, via “mainstream” parenting beliefs and behaviors, was stronger for European-American families than for Hispanic- and African-American families. The policy implications of increasing the schooling-related cognitive skills of low-educated parents are discussed.  相似文献   

Understanding Head Start children's problem behaviors in the context of arrest or incarceration of household members     

Yair Ziv  Soumya Alva  Nicholas Zill 《Early childhood research quarterly》2010

Using data from the nationally representative Head Start Family and Child Experiences Survey (FACES), the relationships between living in a household where a household member had been arrested or incarcerated and conduct problems of preschool children enrolled in Head Start were examined. Children who lived in such households showed more aggressive, hyperactive, and withdrawn behaviors than children who lived in households with no such exposure. These associations remained statistically significant after controlling for other family background characteristics. Parental involvement in Head Start, less use of spanking, and more time spent by the child in Head Start were associated with less problem behaviors.  相似文献