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   10篇
  免费   0篇
管理学   1篇
民族学   1篇
人口学   3篇
丛书文集   1篇
社会学   1篇
统计学   3篇
  2013年   1篇
  2009年   1篇
  2006年   1篇
  1991年   1篇
  1989年   1篇
  1988年   2篇
  1983年   1篇
  1982年   1篇
  1980年   1篇
排序方式: 共有10条查询结果,搜索用时 15 毫秒
1
1.
2.
3.
Infant mortality in England and Wales only began its secular decline at the beginning of this century, although mortality among those aged 1-4 began to decline earlier. The 1911 Census of Fertility provides the basis for estimates of infant mortality among occupational groups. A diagrammatic model of decline is elaborated, using fertility decline, social class, income, and urban/rural distribution as explanatory variables. Results of the analysis suggest that infant mortality decline, whose average value was 35 percent from a peak of 132 per 1,000, was increased by improvements in the urban environment and advanced by high or regular income, whereas fertility decline had only a small effect.  相似文献   
4.
The problem of testing whether heterozygotes have a selective advantage is considered, assuming the stepwise mutation model for electrophoretic alleles. The population is observed for a number of generations, and the likelihoods of the changes in allele frequencies under the heterozygote advantage model and under the strict neutrality model are compared. It is shown by simulation that statistical tests based on the likelihoods have little power to detect selection if only a few generations of data are available.
Many population genetic models, including the stepwise mutation model, have been formulated as diffusion processes in continuous time. The paper gives expressions for the likelihoods of multivariate diffusions observed over a time interval.  相似文献   
5.
The following report arose from an enquiry by a zoologist, J. M. Cullen, concerning various possible ways of analysing bird count data. He was particularly interested in two questions: (i) What is the best way to estimate abundances of various species?, and (ii) What evidence is there that birds occur randomly (in particular, as a Poisson process) as opposed to in flocks or according to some mutual repulsion process?  相似文献   
6.
对于一个正在谋求发展的政权,苏非的避世苦修、清心寡欲、淡泊名利、不问世事并不值得提倡,正如11世纪新疆喀喇汗王朝的著名文学作品《福乐智慧》所提到的日出国王统治的国度,伊斯兰教正统派信仰盛行并以积极的态度参与国家治理。当时苏非已经出现,处于发展的初期阶段,属于个人行为,未形成大的苏非教团,但显然在社会和统治阶层中得到了一定程度的认同。究其原因,苏非神秘主义以其虔诚的独特的思想体系和修行方式为穆斯林的宗教生活增加了直觉体验和宗教情感,是对穆斯林宗教生活的合理补充。  相似文献   
7.
In 1988, a significant budget reduction at the University of Wyoming left the Athletic Department nearly $700,000 short on operating funds compared to the previous biennium. In order to make the necessary monetary cuts, the Athletic Department eliminated the men's and women's varsity ski teams from University sponsorship, thus removing one of the most successful and popular programs from the athletic family. A protest of this action quickly spread throughout the state and the Athletic Department received harsh criticism. However, through the cardinal preference techniques of Multiple Attribute Decision Making, it was determined that the criticism of the Athletic Department for dropping the ski programs was unfounded. But in light of the politics of the situation, after several months of deliberation, the ski programs were eventually reinstated with a greatly reduced budget and the team committed to raise a certain percentage of their monetary requirements through their own fund raising efforts.  相似文献   
8.
全球化给美国和中国的多语教育带来什么挑战?美中两国采取何种语言战略应对全球化挑战?这些都是全球化时代大国在政治斗争和软实力较量中不可回避的问题.针对这些问题,本文提出语言意识形态和语言秩序两个概念,并以这两个概念为理论框架,对美中两国的语言意识形态、语言秩序及语言战略的历史和现实做出初步分析.全球化正在改变美中两国的语言意识,并重组两国的语言秩序,从而给多语教育带来挑战和机会.  相似文献   
9.
The sampling theory of Fisher's logarithmic distribution, discussed in Wani (1978), is extended to the class of power-series distributions.  相似文献   
10.
Existing training on elder mistreatment in nursing homes focuses on detection and reporting of abuse, with little training specifically targeted toward prevention of mistreatment before it occurs. We used qualitative interviews with nursing home staff, policy makers, and related professionals to identify training needs. Based on participant accounts, we drafted a number of competencies essential for caregiver training to prevent mistreatment in nursing homes. Competencies include those dealing with definitions and policies, risks for mistreatment, communication and respect in relationships with residents, and development of a cooperative work environment. Competencies are discussed along with illustrative examples, and implications for practice and policy are addressed.  相似文献   
1
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