全文获取类型
收费全文 | 23025篇 |
免费 | 304篇 |
专业分类
管理学 | 3171篇 |
民族学 | 149篇 |
人才学 | 1篇 |
人口学 | 3450篇 |
丛书文集 | 79篇 |
教育普及 | 2篇 |
理论方法论 | 1652篇 |
综合类 | 624篇 |
社会学 | 10728篇 |
统计学 | 3473篇 |
出版年
2021年 | 69篇 |
2020年 | 193篇 |
2019年 | 231篇 |
2018年 | 1883篇 |
2017年 | 1998篇 |
2016年 | 1334篇 |
2015年 | 268篇 |
2014年 | 294篇 |
2013年 | 2097篇 |
2012年 | 717篇 |
2011年 | 1452篇 |
2010年 | 1259篇 |
2009年 | 1010篇 |
2008年 | 1077篇 |
2007年 | 1259篇 |
2006年 | 219篇 |
2005年 | 572篇 |
2004年 | 543篇 |
2003年 | 473篇 |
2002年 | 354篇 |
2001年 | 319篇 |
2000年 | 307篇 |
1999年 | 315篇 |
1998年 | 209篇 |
1997年 | 205篇 |
1996年 | 241篇 |
1995年 | 190篇 |
1994年 | 207篇 |
1993年 | 177篇 |
1992年 | 236篇 |
1991年 | 232篇 |
1990年 | 211篇 |
1989年 | 219篇 |
1988年 | 204篇 |
1987年 | 186篇 |
1986年 | 189篇 |
1985年 | 174篇 |
1984年 | 207篇 |
1983年 | 200篇 |
1982年 | 166篇 |
1981年 | 137篇 |
1980年 | 139篇 |
1979年 | 166篇 |
1978年 | 136篇 |
1977年 | 119篇 |
1976年 | 102篇 |
1975年 | 101篇 |
1974年 | 95篇 |
1973年 | 93篇 |
1971年 | 64篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
951.
This article describes an algorithm used to formulate an inbound consolidation strategy when multi-items are replenished in groups and when total logistics cost is to be minimized. The importance of this algorithm is threefold (1) no optimal procedure exists for grouping multi-items when minimizing total logistics cost, (2) a complete enumeration of all possible groups (from which the optimal grouping set can be identified) is impractical due to the combinatorial nature of the grouping problem, and (3) no other heuristics have been developed that adequately reflect shipping cost in the analysis like this one does. We report the experience of using this algorithm to group and reorder 75 selected ensembles containing a total of 517 inventory items of a retail merchandising firm. 相似文献
952.
Mary E. Campbell Verna M. Keith Vanessa Gonlin Adrienne R. Carter-Sowell 《Race and social problems》2020,12(3):266-278
Several different measures of skin color are popular in social science surveys, yet we have little evidence to suggest which method is the most valid or re 相似文献
953.
Yader R. Lanuza 《Race and social problems》2020,12(2):112-132
Previous research highlights parental psychological and personal resources as determinants of children’s emotional support. Less emphasis is placed o 相似文献
954.
Do people think individuals with Substance Use Disorder (SUD) have freewill? How does addiction science inform views on the issue? We distinguish between two senses of freewill: 1) libertarian freewill , in which freedom turns on a particular metaphysical conception of action (sometimes operationalized as “could have done otherwise”), and 2) compatibilist freewill , in which freedom depends on the relation between the actor's psychology and her actions (e.g., “was the act what she wanted to do?”). We argue that, in different ways, scientific accounts can impact conceived freewill by linking addictive behavior to mechanisms that observers view as peripheral to the actor ( motivation modularity) . While a variety of impacts on conceived compatibilist freewill are plausible, we argue that contemporary addiction science has no direct bearing on conceived libertarian freewill. Addiction science may, however, indirectly impact conceived libertarian freewill by priming an explanatory framework in which intention is superfluous (especially materialism). 相似文献
955.
956.
957.
958.
Jordan Belisle Kate Huggins Meghan Doherty Caleb R. Stanley Mark R. Dixon 《The Analysis of verbal behavior》2020,36(2):233
We sought to evaluate the efficacy of successive matching training for establishing generalized reflexive matching across 4 children with autism. In Experiment 1, differential reinforcement with delay fading was efficacious in establishing “yes” and “no” matching and nonmatching responses in 2 participants when 2 identical or nonidentical picture stimuli were presented. In addition, emergent visual–visual reflexive relational responses were observed using novel picture stimuli in a transfer test phase. In Experiment 2, differential reinforcement alone was efficacious in establishing matching and nonmatching responses in the other 2 participants when 2 identical or nonidentical objects were presented. Transfer to identical objects presented through touch (i.e., tactile discrimination) was additionally observed for both participants. Procedures in the study were adapted from the PEAK Relational Training System to aid in clinical replication, and the translational results have implications for language training with individuals with autism. 相似文献
959.
960.
Jana Vietze Maja K. Schachner Linda Juang Fons J.R. van de Vijver Peter Noack 《Journal of research on adolescence》2020,30(3):616-632
We examined how perceived acculturation expectations from parents and school, and ethnic discrimination predicted early adolescents’ heritage and mainstream acculturation orientations at home (private domain) and in school (public domain) one year later. We surveyed 263 early adolescents of immigrant background in Germany (Mage = 10.44 years, 60% female). Multigroup path analyses revealed that perceived acculturation expectations and ethnic discrimination were more strongly related to adolescents’ private than public acculturation orientations. Parental heritage expectations were the strongest predictor of adolescents’ acculturation orientations. Boys were more susceptible than girls to ethnic discrimination and acculturation expectations in school, which affected their private and public acculturation orientations. Results highlight the importance of integrating domain‐specific and gendered experiences when analyzing adolescents’ acculturative development. 相似文献