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   1992篇
  免费   61篇
  国内免费   17篇
管理学   167篇
民族学   6篇
人才学   1篇
人口学   15篇
丛书文集   157篇
理论方法论   39篇
综合类   1150篇
社会学   91篇
统计学   444篇
  2024年   2篇
  2023年   9篇
  2022年   24篇
  2021年   26篇
  2020年   38篇
  2019年   50篇
  2018年   37篇
  2017年   52篇
  2016年   59篇
  2015年   61篇
  2014年   93篇
  2013年   212篇
  2012年   145篇
  2011年   130篇
  2010年   110篇
  2009年   101篇
  2008年   115篇
  2007年   125篇
  2006年   120篇
  2005年   100篇
  2004年   92篇
  2003年   91篇
  2002年   75篇
  2001年   62篇
  2000年   51篇
  1999年   20篇
  1998年   8篇
  1997年   12篇
  1996年   12篇
  1995年   8篇
  1994年   6篇
  1993年   5篇
  1992年   3篇
  1991年   3篇
  1990年   4篇
  1987年   2篇
  1986年   1篇
  1985年   2篇
  1984年   1篇
  1982年   1篇
  1981年   1篇
  1980年   1篇
排序方式: 共有2070条查询结果,搜索用时 578 毫秒
911.
This study aims to analyse the feminisation of poverty in Korea focusing on time use and time poverty. Time conditions are compared for the categories of poor and non-poor men, and poor and non-poor women. Inequality in between-group and within-group working time is analysed through the Theil Index Decomposition. The analysis results reveal that women experience multiple poverties in the process of working long hours to ensure household survival. This phenomenon is more serious in the case of poor female household members. There are also high levels of inequality in unpaid work, which is mostly carried out by women.  相似文献   
912.
《诗经》中题目没有出自首句的篇章共计27篇,从思想内容表现出的题旨、人物、地点、特定动作、外界景物等五个角度推究分析,可以探析出这27篇取名不出首句的原由。从篇章标题中还可以推知,《小旻》、《小宛》、《小弁》、《小明》等篇章的取名,是因位列于"小雅",为了和"大雅"中的相似篇目相区分,所以篇名中加有"小"字。  相似文献   
913.
本文应用遗传算法解决具有多阶段决策特点的最短路问题,对于较多顶点的此类最短路问题也有较好的应用。文中给出了一个有阶段数为20,共348个顶点的最短路问题的计算结果。  相似文献   
914.
Because economic and social opportunities are unevenly distributed across England, the places in which children and young people are born and grow up can have significant influences on both their current well‐being and their future life chances. Data now available confirms the expected finding that the level of child well‐being found in an area tends to reflect its overall level of disadvantage. However, there are a number of exceptions to this general rule – local areas where child well‐being is either significantly better or worse than would be expected given the levels of advantage which exist there. Some of the possible explanations for these exceptions are considered, using additional data available from the mapping of children's services, particularly in relation to the provision of child and adolescent mental health services. It is argued that continued analysis of these different streams of data as they develop and mature over the coming years had an important role to play in assisting policy‐makers, service providers and local people, working collaboratively, to promote the well‐being of disadvantaged children and young people.  相似文献   
915.
英语写作是中国学生的一个薄弱环节。究其原因,学生在进行英语写作时往往会受到汉语概念体系的影响,不能熟练使用英语语言进行输出。汉语与英语的概念体系在词义、句子及篇章等方面存在着一定差别,也会对英语写作产生负面影响,而减少汉语概念体系的影响、了解英语概念体系以及提高外语的输入量等方面途径可以学生提高大学英语写作中的概念流利。  相似文献   
916.
For a multivariate linear model, Wilk's likelihood ratio test (LRT) constitutes one of the cornerstone tools. However, the computation of its quantiles under the null or the alternative hypothesis requires complex analytic approximations, and more importantly, these distributional approximations are feasible only for moderate dimension of the dependent variable, say p≤20. On the other hand, assuming that the data dimension p as well as the number q of regression variables are fixed while the sample size n grows, several asymptotic approximations are proposed in the literature for Wilk's Λ including the widely used chi-square approximation. In this paper, we consider necessary modifications to Wilk's test in a high-dimensional context, specifically assuming a high data dimension p and a large sample size n. Based on recent random matrix theory, the correction we propose to Wilk's test is asymptotically Gaussian under the null hypothesis and simulations demonstrate that the corrected LRT has very satisfactory size and power, surely in the large p and large n context, but also for moderately large data dimensions such as p=30 or p=50. As a byproduct, we give a reason explaining why the standard chi-square approximation fails for high-dimensional data. We also introduce a new procedure for the classical multiple sample significance test in multivariate analysis of variance which is valid for high-dimensional data.  相似文献   
917.
针对几何建模的空间相关信道复杂度较高的问题,提出了一种通用的空间相关随机MIMO信道的建模方法。构建该信道首先需产生随机独立的MIMO信道,其次将该信道进行相位补偿,最后乘上空间相关矩阵。该信道建模采用随机产生方式,同时考虑信道的时延扩展、多普勒扩展、角度扩展等多种信道参数,通过调整某些参数可生成适用于各种MIMO技术研究的信道模型,如智能天线、空间分集、复用等,并且具有计算复杂度低、产生简便的优点。  相似文献   
918.
在英译汉中,常常存在一种文理欠通、冗长累赘、佶屈聱牙的欧化译文,其特点之一是与原文文本相比,其目标语文本的字数扩增了。通过对一个原文片断与两个回译文文本的用字量之比较研究,以及两个回译文文本较原文文本扩增字数原因的定量分析,运用汉语句型理论,探讨英译汉中目标语文本扩增的特点及其主要成因——英汉文化及思维层面的差异。虽然汉语与英语都属于SVO语言,汉语的句型体系可以覆盖英语的句型体系,但英语的句型理论是建立在机械唯物主义的语言世界观基础之上的,汉语的句型理论是建立在朴素的辩证唯物主义语言世界观基础之上的。汉语句子是按线型结构排列的,而英语句子是按树型结构排列的。  相似文献   
919.
Abstract

This paper presents findings from a study of individuals with multiple sclerosis examining their planning and preparation activities for their future independent living and long-term care needs. Data collected from a representative sample of National Multiple Sclerosis Society members in the greater metropolitan St. Louis and eastern Illinois area indicate significant differences in income, assets, education, health and functional limitation status between individuals living in rural versus urban areas. Additionally, findings show respondents with greater levels of education and assets, and those living in urban areas, are more likely to have saved for retirement, made legal preparations, or engaged in planning activities for future needs. Recommendations for asset building programs include incorporating education and training on planning for independent living and long-term care into financial planning curriculum, particularly for people with multiple sclerosis living in rural areas.  相似文献   
920.
A multiple regression model is considered in which the density of the response variable is a member of a very wide family which includes many well-known distributions. Schemes of observation in which the response observations are grouped or type 1 right censored are examined. Results on the asymptotic variance efficiencies of the maximum likelihood estimators of the regression coefficients and standard deviation of the error distribution are presented for the two schemes.  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