全文获取类型
收费全文 | 11961篇 |
免费 | 296篇 |
专业分类
管理学 | 1786篇 |
民族学 | 57篇 |
人才学 | 1篇 |
人口学 | 1207篇 |
丛书文集 | 63篇 |
教育普及 | 1篇 |
理论方法论 | 1030篇 |
现状及发展 | 1篇 |
综合类 | 141篇 |
社会学 | 5701篇 |
统计学 | 2269篇 |
出版年
2023年 | 82篇 |
2022年 | 64篇 |
2020年 | 181篇 |
2019年 | 251篇 |
2018年 | 286篇 |
2017年 | 381篇 |
2016年 | 302篇 |
2015年 | 200篇 |
2014年 | 263篇 |
2013年 | 2053篇 |
2012年 | 417篇 |
2011年 | 343篇 |
2010年 | 273篇 |
2009年 | 278篇 |
2008年 | 311篇 |
2007年 | 302篇 |
2006年 | 273篇 |
2005年 | 286篇 |
2004年 | 264篇 |
2003年 | 234篇 |
2002年 | 258篇 |
2001年 | 292篇 |
2000年 | 301篇 |
1999年 | 279篇 |
1998年 | 190篇 |
1997年 | 183篇 |
1996年 | 174篇 |
1995年 | 172篇 |
1994年 | 137篇 |
1993年 | 158篇 |
1992年 | 179篇 |
1991年 | 155篇 |
1990年 | 164篇 |
1989年 | 185篇 |
1988年 | 156篇 |
1987年 | 140篇 |
1986年 | 152篇 |
1985年 | 178篇 |
1984年 | 172篇 |
1983年 | 162篇 |
1982年 | 128篇 |
1981年 | 108篇 |
1980年 | 104篇 |
1979年 | 138篇 |
1978年 | 92篇 |
1977年 | 91篇 |
1976年 | 90篇 |
1975年 | 84篇 |
1974年 | 82篇 |
1973年 | 74篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
The authors examined the impact of sense of coherence on the career thought processes of a sample of college students. A. Antonovsky (1987) defined sense of coherence as the global orientation that the world is comprehensible, manageable, and meaningful. Study participants completed the Sense of Coherence Scale (A. Antonovsky, 1987) and the Career Thoughts Inventory (CTI; J. P. Sampson, G. W. Peterson, J. G. Lenz, R. C. Reardon, & D. E. Saunders, 1996). Multivariate tests indicated a medium relationship between sense of coherence and CTI Total and subscale scores; sense of coherence accounted for 14% of the variance. Univariate tests also indicated a medium relationship between sense of coherence and each subscale. 相似文献
12.
Colin C. Williams 《The Sociological review》2002,50(4):525-542
A recurring theme across the social sciences is that non‐capitalist production is disappearing albeit slowly and unevenly, and is being replaced by a commodified economy in which goods and services are produced by capitalist firms for a profit under conditions of market exchange. In this paper, however, I evaluate critically this commodification thesis. Even in the heartland of commoditisation ‐ the advanced economies. Large economic spaces are identified where alternative economic relations and motives prevail. Rather than view them as leftovers of pre‐capitalist formations, this paper argues that they are the result of both the contradictions inherent in the structural shifts associated with the pursuit of commodification as well as the existence of‘cultures of resistance’, As such, they are viewed as 'spaces of hope’which highlight the demonstrable construction and practice of alternative social relations and logic's of work outside profit‐motivated market‐oriented exchange. 相似文献
13.
14.
15.
Fire and restoration of the largest urban forest of the world in Rio de Janeiro City,Brazil 总被引:1,自引:1,他引:0
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
16.
C. Eddie Palmer E. Joseph Savoie 《Sociological Practice: A Journal of Clinical and Applied Sociology》2002,4(1):89-97
Service-learning programs are not free from challenges brought about by lack of financial support, lack of widespread commitment from professors, community agencies, and recipients of service, and lack of knowledge and insight in students directly involved in such programs. While service-learning initiatives and programs serve positive functions for organizations and individuals, rhetorical accolades for service learning can distort or omit the realities of program implementation and sustained delivery. This paper specifically explores the following challenges connected to service-learning programs: (1) pedagogical difficulties; (2) student limitations; (3) time constraints; and (4) community cooperation. 相似文献
17.
Paul Atkinson 《The Sociological review》2005,53(2):380-382
18.
A finite mixture model using the multivariate t distribution has been shown as a robust extension of normal mixtures. In this paper, we present a Bayesian approach for inference about parameters of t-mixture models. The specifications of prior distributions are weakly informative to avoid causing nonintegrable posterior distributions. We present two efficient EM-type algorithms for computing the joint posterior mode with the observed data and an incomplete future vector as the sample. Markov chain Monte Carlo sampling schemes are also developed to obtain the target posterior distribution of parameters. The advantages of Bayesian approach over the maximum likelihood method are demonstrated via a set of real data. 相似文献
19.
Barry C. Arnold Enrique Castillo José María Sarabia 《Journal of statistical planning and inference》2008
The paper deals with the problem of using contours as the basis for defining probability distributions. First, the most general probability densities with given contours are obtained and the particular cases of circular and elliptical contours are dealt with. It is shown that the so-called elliptically contoured distributions do not include all possible cases. Next, the case of contours defined by polar coordinates is analyzed including its simulation and parameter estimation. Finally, the case of cumulative distribution functions with given contours is discussed. Several examples are used for illustrative purposes. 相似文献
20.
The problem considered is that of finding an optimum measurement schedule to estimate population parameters in a nonlinear model when the patient effects are random. The paper presents examples of the use of sensitivity functions, derived from the General Equivalence Theorem for D-optimality, in the construction of optimum population designs for such schedules. With independent observations, the theorem applies to the potential inclusion of a single observation. However, in population designs the observations are correlated and the theorem applies to the inclusion of an additional measurement schedule. In one example, three groups of patients of differing size are subject to distinct schedules. Numerical, as opposed to analytical, calculation of the sensitivity function is advocated. The required covariances of the observations are found by simulation. 相似文献