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   32478篇
  免费   780篇
  国内免费   1篇
管理学   4304篇
民族学   234篇
人口学   4312篇
丛书文集   78篇
教育普及   1篇
理论方法论   2557篇
综合类   507篇
社会学   15844篇
统计学   5422篇
  2023年   173篇
  2022年   116篇
  2021年   175篇
  2020年   475篇
  2019年   637篇
  2018年   2313篇
  2017年   2550篇
  2016年   1756篇
  2015年   563篇
  2014年   750篇
  2013年   4159篇
  2012年   1267篇
  2011年   1847篇
  2010年   1574篇
  2009年   1223篇
  2008年   1399篇
  2007年   1505篇
  2006年   626篇
  2005年   701篇
  2004年   736篇
  2003年   631篇
  2002年   522篇
  2001年   531篇
  2000年   479篇
  1999年   442篇
  1998年   343篇
  1997年   288篇
  1996年   326篇
  1995年   305篇
  1994年   276篇
  1993年   273篇
  1992年   322篇
  1991年   311篇
  1990年   306篇
  1989年   272篇
  1988年   262篇
  1987年   213篇
  1986年   238篇
  1985年   263篇
  1984年   231篇
  1983年   198篇
  1982年   166篇
  1981年   132篇
  1980年   163篇
  1979年   175篇
  1978年   138篇
  1977年   119篇
  1976年   90篇
  1975年   96篇
  1974年   96篇
排序方式: 共有10000条查询结果,搜索用时 102 毫秒
61.
Welfare reform was examined for 39 Michigan families whose children have significant health or intellectual and behavioral disabilities. As a group, these families received little specialized assistance or services to address their unique needs. Family-cited barriers to self-sufficiency included poorly trained welfare caseworkers, limited public transportation, and inadequate child care. Having an older child was the only discriminating variable between working and non-working mothers. However, working mothers only had temporary positions with no benefits and low pay. All families, whether employed or not, lived below the poverty line.  相似文献   
62.
National Park of Tijuca in Rio de Janeiro (Brazil) is about 3,300 ha and considered the largest urban forest in the world. Its floristic composition is typical of Atlantic Rain Forest. The reserve is being altered because of fire occurrences and urban expansion. This study identified locations and causes of forest fires, and makes management recommendations to restore damaged areas. From 1991 to 2000, forest firefighters recorded an average of 75-fire occurrences/year. Identified causes included hot air balloons (24%), intentional (24%), rubbish burning (21%) and religious practices (17%). Primary fuels included invasive grasses and ferns. Although hot air balloons destroyed larger areas of forest in each occurrence, a greater number of fires started in the invasive vegetation along roads that bisect the forest. In response to recurrent forests, invasive vegetation has spread gradually into the forest increasing forest degradation. To decrease fire damage, sites with high fire frequencies and density of invasive vegetation were planted with less flammable species. Results indicate that fire frequency decreased and density of invasive vegetation declined. This approach appears to prevent fire incidence, reduce the need for fire fighting, and preserve existing biodiversity.  相似文献   
63.
Tolerating Force: A Contextual Analysis of the Meaning of Tolerance   总被引:1,自引:0,他引:1  
This study employs college student survey data to examine the specific social conditions that influence tolerance of the use of force against children. The findings reveal that a certain ambivalence exists regarding parental force to control the behavior of children. Although the respondents are tolerant of parental force used to counteract disrespectful provocations by children, they are less tolerant of force used to counteract age-related misbehaviors. Implications of these findings are discussed in light of current and future social and family policy.  相似文献   
64.
The authors present three educational approaches designed to demystify the writing process and to support better writing skills among family therapists. One framework is an academic course in professional writing, another is a writing seminar for family therapy and physician trainees within a medical school setting, and the third is a 2-hour continuing education writing workshop for family therapists. Each is replicable within a variety of settings.  相似文献   
65.
International labour migration is a main livelihood strategy for many people in Nepal. This article analyses the migration process from the perspective of migrants and their non‐migrating household members, exploring the institutional regulations that structure the organization of migration and the cash flows involved. The results are based on a case study conducted in Sainik Basti, Western Nepal, in 2002. The article shows that for different destinations there are specific ways of organizing migration. These country specific ways of organizing migration demand specific assets from prospective migrants and their household members and, therefore, influence their choice of destination. Savings are remitted back home mainly by carrying them personally or by using the hundi system. In spite of the risks and difficulties involved, international labour migration often contributes to sustainable livelihoods. The main outcomes of migration are increased financial capital, education of the children, migration‐specific knowledge, and increased social capital. This enlarged asset endowment lowers both investment costs and risks involved in migration, and thereby increases its potential net return. Each act of migration, therefore, facilitates and stimulates subsequent migration.1  相似文献   
66.
How are social networks organized and how much structure and openess do they have? The ambiguity of networking and the grade of organization are discussed and described theoretically and with an authentic example.  相似文献   
67.
Polynomial spline regression models of low degree have proved useful in modeling responses from designed experiments in science and engineering when simple polynomial models are inadequate. Where there is uncertainty in the number and location of the knots, or breakpoints, of the spline, then designs that minimize the systematic errors resulting from model misspecification may be appropriate. This paper gives a method for constructing such all‐bias designs for a single variable spline when the distinct knots in the assumed and true models come from some specified set. A class of designs is defined in terms of the inter‐knot intervals and sufficient conditions are obtained for a design within this class to be all‐bias under linear, quadratic and cubic spline models. An example of the construction of all‐bias designs is given.  相似文献   
68.
The sociocultural content of foreign language textbooks has become a concern of scholars and practitioners owing to the fact that the traditional emphasis on purely linguistic issues has been expanded to embrace a language in context approach. This paper studies the English‐speaking communities that are described in English language teaching textbooks marketed in Spain. It examines to what extent an international and/or intercultural approach is a constituent element in their design.  相似文献   
69.
This paper outlines the conceptual bases, strategies, and psychological attributes of leadership by self-leadership. In addition, relations to other theories of leadership are drawn. Dimensions and correlates of self-leadership competence are described and discussed. Various approaches for developing self-leadership competence are discussed as well.  相似文献   
70.
Sets of relatively short time series arise in many situations. One aspect of their analysis may be the detection of outlying series. We examine the performance of standard normal outlier tests applied to the means, or to simple functions of the means, of AR(1) series, not necessarily of equal lengths. Although unequal lengths of series implies that the means have unequal variances, that are only known approximately, it is shown that nominal significance levels hold good under most circumstances. Thus a standard outlier test can usefully be applied, avoiding the complication of estimating the time series' parameters. The test's power is affected by unequal lengths, being higher when the slippage occurs in one of the longer series  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