首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   43篇
  免费   1篇
教育   29篇
科学研究   5篇
体育   8篇
综合类   1篇
信息传播   1篇
  2021年   3篇
  2019年   2篇
  2018年   3篇
  2017年   1篇
  2015年   1篇
  2014年   3篇
  2013年   5篇
  2012年   1篇
  2011年   2篇
  2010年   1篇
  2009年   4篇
  2007年   4篇
  2006年   3篇
  2005年   1篇
  2004年   1篇
  2003年   4篇
  2002年   1篇
  1995年   3篇
  1994年   1篇
排序方式: 共有44条查询结果,搜索用时 15 毫秒
21.
This year's 50th anniversary of Lamaze International is a time to reflect upon our past and present as we work together to build the future of childbirth. In the 1950s and 1960s, thoughtful men and women such as Elisabeth Bing began to look carefully at the birthing practices in the United States. Lamaze Certified Childbirth Educators became leaders in improving birthing practices by teaching women and their partners the truth about how women were cared for during childbirth. Currently, the rise in maternal mortality and morbidity in the United States illustrates the pressing need for more changes. Lamaze Certified Childbirth Educators are leading change by pushing for the wide adoption of Lamaze International's Six Healthy Birth Practices to promote natural, safe, and healthy birth.  相似文献   
22.
刘恒的小说中有着太多的死亡,就像诗歌的意象一样,“死亡”一词在其作品中鲜明夺目却又沉重无比。无论是各式各样的死亡方式,阴暗湖湿的死亡地点还是多个层面的死亡原因和死亡模式,如此密集的死亡意象都呈现出一种非此不可的必然性。在他的作品中,人物与外部世界和其他人物之间有着多重的冲突,这构成了死亡意象的多层意义结构,使得死亡宿命般地笼罩着作品和作品中的人物。  相似文献   
23.
从20世纪40年代开始的体力活动与冠心病发病及死亡风险的研究使人们开始关注体力活动、心肺耐力与健康及疾病风险间的关联。特别是近些年来世界范围内体力活动不足问题日益加剧,体力活动与心肺耐力,以及心肺耐力在人体健康状况及疾病死亡风险中的重要作用尤其受到关注,成为公共健康与运动科学领域最活跃的研究方向之一。心肺耐力作为人群体力活动水平的一个客观生理指标,与各人群全死因死亡率及心血管疾病死亡率高度相关,是体质健康各组成部分的核心要素。以Steven N Blair教授在美国Cooper研究所主持开展的有氧中心纵向研究(ACLS)的系列成果为主要参考资料,综述体力活动、心肺耐力与人群健康及疾病风险间的关联,并讨论前瞻性流行病学研究在体力活动与公共健康研究领域的重要功能,揭示心肺耐力在体质健康各要素中的核心地位。  相似文献   
24.
Previous work shows that higher levels of education quality (as measured by international student achievement tests) increase growth rates of national income. This paper begins by confirming those findings in an analysis involving more countries over more time with additional controls. We then use the panel structure of our data to assess whether the mechanism by which education quality appears to improve per capita income levels is through shifting the level of the production function (probably not), through increasing the impact of an additional year of education (probably not), or through increasing a country's rate of technological progress (very likely). Mortality rates complement income levels as indicators of national well-being, and we extend our panel models to show that improved education quality increases the rate of decline in infant mortality. In the analysis of growth, we find a stronger impact of education quality and of years of schooling in open than in closed economies.  相似文献   
25.
INTRODUCTIONTheentomophthoraceousfungus,Zoophthoraanhuiensis (Li)Humber,isanaphid specificpathogenonlyknownfromChina .Thisfungalpathogenplaysanimportantroleinthenaturalcontrolofaphidpopulationsinthemiddle lowerreachoftheChangjiangRiverduringautumnandwint…  相似文献   
26.
<正>Of all human conditions,aging and death are perhaps the most universal.Unfortunately death among elderly populations is often a drawn out and painful affair,as advanced age is accompanied by marked rises in morbidity and mortality due to infectious diseases.Precisely why this is the case has been subject to a great deal of speculation,but one commonly held explanation is referred to as immunosenescence,where the human body undergoes a remodeling of both innate and adaptive immune responses,and some functions are enhanced while others diminished.Both responses are key to the human immune systems,which fights off outside  相似文献   
27.
<正>Highly pathogenic avian influenza A viruses are emerging pandemic threats that have caused several outbreaks with high mortality in human beings in the past decades.The infection of avian infl uenza viruses,such as subtype H5 and H7,could cause a series of severe respiratory and extra-respiratory complications,  相似文献   
28.
There is a general presumption among many policy makers that secondary and higher education is not necessary for economic growth and development. On the other hand, it is literacy and primary education that is argued to be important. Estimates on internal rate of return also contributed to strengthening of such a presumption. Accordingly, secondary and higher education do not figure on the poverty reduction agenda of many poor countries and of the international aid organisations. The Indian experience also testifies to all this. Secondary and more strikingly higher education has been subject to neglect by the government. Using most recent statistics, it is attempted here to show that the general presumption on the weak or negligible role of secondary and higher education in development is not valid and that post-elementary education is important for reduction in poverty, in improving infant mortality and life expectancy, and for economic growth.  相似文献   
29.
本文报导了南方大口鲶幼鱼的死亡存在一个敏感期.出现于内源性营养阶段进入混合性营养阶段,即孵化后的第4-10天内.幼鱼饲养中,水蚯蚓比枝角类生长要快.  相似文献   
30.
随机利率下的准备金与寿险风险分析   总被引:5,自引:0,他引:5  
在人寿保险的纯保费及理论责任准备金的计算中,死亡率一般依据生命表,利息率一般采用固定利率。实际上,寿险死亡率与生命表的死亡率有所差别,利率具有随机性,寿险死亡率与生命表死亡率的差额及利率的随机性均能形成保险经营中的盈亏风险,本文利用Bayes方法,给出寿险死亡率的分布,并对保险经营中盈亏风险进行了系统分析,最后归结为动态规划模型。  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号