全文获取类型
收费全文 | 12032篇 |
免费 | 177篇 |
国内免费 | 3篇 |
专业分类
管理学 | 1639篇 |
民族学 | 53篇 |
人口学 | 1129篇 |
丛书文集 | 51篇 |
理论方法论 | 896篇 |
综合类 | 189篇 |
社会学 | 5160篇 |
统计学 | 3095篇 |
出版年
2023年 | 64篇 |
2020年 | 186篇 |
2019年 | 274篇 |
2018年 | 315篇 |
2017年 | 449篇 |
2016年 | 297篇 |
2015年 | 228篇 |
2014年 | 303篇 |
2013年 | 2164篇 |
2012年 | 392篇 |
2011年 | 351篇 |
2010年 | 248篇 |
2009年 | 266篇 |
2008年 | 238篇 |
2007年 | 265篇 |
2006年 | 227篇 |
2005年 | 232篇 |
2004年 | 210篇 |
2003年 | 197篇 |
2002年 | 227篇 |
2001年 | 280篇 |
2000年 | 258篇 |
1999年 | 252篇 |
1998年 | 204篇 |
1997年 | 190篇 |
1996年 | 177篇 |
1995年 | 180篇 |
1994年 | 158篇 |
1993年 | 153篇 |
1992年 | 199篇 |
1991年 | 183篇 |
1990年 | 183篇 |
1989年 | 169篇 |
1988年 | 137篇 |
1987年 | 132篇 |
1986年 | 143篇 |
1985年 | 159篇 |
1984年 | 165篇 |
1983年 | 162篇 |
1982年 | 134篇 |
1981年 | 120篇 |
1980年 | 121篇 |
1979年 | 135篇 |
1978年 | 123篇 |
1977年 | 105篇 |
1976年 | 88篇 |
1975年 | 83篇 |
1974年 | 78篇 |
1973年 | 76篇 |
1971年 | 69篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
William G. Axinn 《Rural sociology》1992,57(3):396-413
Abstract Participation in rural development programs that organize members into local cooperative groups can alter the decision-making environment facing couples to reflect some of the negative consequences of childbearing. This study uses data from Nepal, collected through a combination of ethnographic and survey methods, to test the effects of participation in such a development program on fertility behavior. Results demonstrate that program participants are much more likely to use contraceptives to limit their fertility than are non-participants. The study provides empirical support for theories linking this type of institutional change to fertility and indicates a policy option that can allow some negative consequences of childbearing to affect couples' fertility decisions. 相似文献
992.
Noorderhaven Niels G. Nooteboom Bart Berger Hans 《Journal of Management and Governance》1998,2(3):213-232
Studies of industrial buyer-supplier relations mostly focus on structural characteristics of the transactions between parties, and assume a direct relation between these factors and characteristics of the relationships. This paper focuses on the psychological dimension of transaction relations, reflected in perceptions of dependence, from the perspective of an industrial supplier. In the first step of the analysis, three groups of structural determinants of perceived supplier dependence are explored: factors related to goal mediation, factors related to relation-specific assets, and factors related to network embeddedness. After that, the influence of these structural factors and of perceived supplier dependence on the ordering of buyer-supplier relations is investigated. Data come from a study of the micro-electronics assembly industry in the Netherlands. The findings show that sales to a particular buyer as a percentage of the total sales of the supplier and the growth of sales to a particular buyer (two forms of goal mediation) are important determinants of perceived supplier dependence. Human asset specificity is also related to perceived supplier dependence. Network embeddedness variables play only a minor role in explaining perceived supplier and buyer dependence in this study. The data further show that perceived dependence has an effect on the degree of ordering in the relationship, next to structural factors like the extendedness of the relationship beyond the focal transaction and physical asset specificity. The effects of human asset specificity and dedicated assets on ordering are contrary to what was expected on the basis of the literature. 相似文献
993.
994.
Gorwaney N Van Arsdol MD Heer DM Schuerman LA 《International migration (Geneva, Switzerland)》1991,29(4):573-599
The authors describe the socioeconomic characteristics and fertility patterns of female immigrants from Latin America to the United States, with a focus on reasons for fertility differentials. "Using the one per cent public use sample from the 1970 and 1980 United States census, we first compare changes in socio economic characteristics from 1970 to 1980, and then examine the determinants of fertility of female immigrants to the United States, aged 16-49, from four Latin American areas or countries of birth.... The findings...suggest that there are direct effects of demographic, assimilation, and socioeconomic variables beyond those mediated by the variables in each of these sets. Further, regardless of the model, the effect of the clusters of demographic characteristics is most apparent. Age categories and marital status are the strongest indexed determinants of immigrant fertility.... The effect of education and employment is strong. Among assimilation variables, duration of residence and language ability are significant determinants of Hispanic immigrant fertility." (SUMMARY IN FRE AND SPA) 相似文献
995.
Femke van den Brink Monique A. M. Smeets David J. Hessen Jona G. Talens Liesbeth Woertman 《Journal of sex research》2013,50(8):786-794
Studies in the field of body image have primarily addressed its negative aspects, such as body dissatisfaction. The present study focused instead on women who are satisfied with their bodies and on how body satisfaction relates to sexual health. A sample of 319 Dutch female university students completed an online survey that included items about body image evaluation, body image investment, overweight preoccupation, body image affect during sexual activity, sexual frequency, sexual functioning, and sexual self-esteem. We found that the level of body dissatisfaction was minimal in our sample. The majority reported neutral or mildly positive body evaluations, and in 30% of the sample these evaluations were clearly positive. Comparisons between women who reported positive versus neutral body evaluations showed that the body-satisfied women had lower body mass indexes (BMIs) and reported less body image investment, less overweight preoccupation, and less body self-consciousness during sexual activity. With regard to sexual health, they reported higher sexual self-esteem and better sexual functioning. Furthermore, we found that body image self-consciousness was negatively associated with sexual functioning, sexual self-esteem, and frequency of sexual activity with a partner. Body satisfaction did not account for a portion of the relationship of body self-consciousness during sexual activity with sexual health. 相似文献
996.
Lucas G. Gago Galvagno Stephanie E. Miller Carolina De Grandis Angel M. Elgier 《Infancy》2021,26(6):962-979
Recent work within early executive function (EF) seems to suggest that toddlers show distinct patterns of development, involving poorly correlated performance across EF tasks and significant improvements over relatively short periods of time. The present study sought to extend these findings by investigating evidence for these patterns in toddlers and the existence of more traditional patterns of EF (e.g., correlations between tasks, links to language) when using the same tasks in a novel Latin American sample. Eighty toddlers (18–24 months) and sixty young preschoolers (30–36) months completed a battery of EF tasks, early social communication, and receptive and expressive language measures. Results indicated that toddlers showed similar distinct patterns of development (i.e., few relations between tasks and links to responding to joint attention), but by early preschool a more cohesive EF and links to language were present. Further, work demonstrated significant age (older children outperformed younger children), gender (girls outperformed boys), and socioeconomic differences (satisfied basic needs outperformed unsatisfied basic needs, but only on the snack delay). This work provides evidence for patterns of emerging EF development within this novel cultural sample (and evidence for group differences) that may be supported by communicative and representational development. 相似文献
997.
Elisa Perrone Andreas Rappold Werner G. Müller 《Statistical Methods and Applications》2017,26(3):403-418
Optimum experimental design theory has recently been extended for parameter estimation in copula models. The use of these models allows one to gain in flexibility by considering the model parameter set split into marginal and dependence parameters. However, this separation also leads to the natural issue of estimating only a subset of all model parameters. In this work, we treat this problem with the application of the \(D_s\)-optimality to copula models. First, we provide an extension of the corresponding equivalence theory. Then, we analyze a wide range of flexible copula models to highlight the usefulness of \(D_s\)-optimality in many possible scenarios. Finally, we discuss how the usage of the introduced design criterion also relates to the more general issue of copula selection and optimal design for model discrimination. 相似文献
998.
A reactive tabu search algorithm for the vehicle routing problem with simultaneous pickups and deliveries 总被引:1,自引:1,他引:1
Niaz A. Wassan A. Hameed Wassan Gábor Nagy 《Journal of Combinatorial Optimization》2008,15(4):368-386
The vehicle routing problem with pickups and deliveries (VRPPD) extends the vehicle routing problem (VRP) by allowing customers
to both send and receive goods. The main difficulty of the problem is that the load of vehicles is fluctuating rather than
decreasing as in the VRP. We design a reactive tabu search metaheuristic that can check feasibility of proposed moves quickly
and reacts to repetitions to guide the search. Several new best solutions are found for benchmark problems. 相似文献
999.
A generalisation of the Farrell cost efficiency measure applicable to non-fully competitive settings
This paper enhances cost efficiency measurement methods to account for situations where the input prices can depend on negotiation or tend to qualitatively differentiate the resources available at each decision making unit. In these circumstances, there are some shortcomings in the cost efficiency measure described in the data envelopment analysis (DEA) literature. This paper proposes new models and measures for cost efficiency evaluation that overcome the limitations of the existing DEA models. The applicability of the measures developed is illustrated in the context of the analysis of bank branch performance. 相似文献
1000.
Information technology (IT) outsourcing vendor organizations contain isolated business units whose creation and sustenance greatly facilitate business operations. But they also introduce important challenges for organizational knowledge management (KM). In this paper, based on 7 months of intensive field-work at India Inc., a leading Indian IT firm, we looked at how members’ identification with two organizations, their own and their client organization, influences their compliance with an organizational KM initiative. The findings show that members have difficulties in complying with the expectations of the organizational KM initiative owing to a stronger identification with their client organizations. At the same time, they comply readily with KM initiatives at the business unit level. The findings show that KM managers at India Inc. use the help of middle level managers in the business units in their efforts to improve members’ compliance with organizational KM. Theoretical and managerial implications of the study are discussed. 相似文献