全文获取类型
收费全文 | 18686篇 |
免费 | 448篇 |
专业分类
管理学 | 2522篇 |
民族学 | 75篇 |
人口学 | 1643篇 |
丛书文集 | 86篇 |
教育普及 | 3篇 |
理论方法论 | 1574篇 |
综合类 | 206篇 |
社会学 | 9228篇 |
统计学 | 3797篇 |
出版年
2021年 | 99篇 |
2020年 | 245篇 |
2019年 | 352篇 |
2018年 | 440篇 |
2017年 | 590篇 |
2016年 | 419篇 |
2015年 | 314篇 |
2014年 | 434篇 |
2013年 | 3520篇 |
2012年 | 540篇 |
2011年 | 538篇 |
2010年 | 395篇 |
2009年 | 360篇 |
2008年 | 367篇 |
2007年 | 399篇 |
2006年 | 399篇 |
2005年 | 373篇 |
2004年 | 320篇 |
2003年 | 300篇 |
2002年 | 325篇 |
2001年 | 454篇 |
2000年 | 420篇 |
1999年 | 422篇 |
1998年 | 288篇 |
1997年 | 270篇 |
1996年 | 323篇 |
1995年 | 305篇 |
1994年 | 317篇 |
1993年 | 313篇 |
1992年 | 356篇 |
1991年 | 328篇 |
1990年 | 345篇 |
1989年 | 311篇 |
1988年 | 288篇 |
1987年 | 255篇 |
1986年 | 249篇 |
1985年 | 269篇 |
1984年 | 277篇 |
1983年 | 240篇 |
1982年 | 216篇 |
1981年 | 182篇 |
1980年 | 191篇 |
1979年 | 200篇 |
1978年 | 179篇 |
1977年 | 156篇 |
1976年 | 143篇 |
1975年 | 148篇 |
1974年 | 110篇 |
1973年 | 107篇 |
1971年 | 93篇 |
排序方式: 共有10000条查询结果,搜索用时 921 毫秒
871.
Miriam G. Valdovinos 《Journal of Ethnic & Cultural Diversity in Social Work》2017,26(4):326-345
Intimate partner sexual violence (IPSV) has been relatively understudied particularly from the perspective of women of color. This study documents the experiences with partner sexual violence of ten Mexican-American women. Qualitative interviews were conducted using snowball sampling with women that had been in abusive marital relationships. A phenomenological approach was used and through a thematic analysis, participant narrative responses were synthesized into themes. All participants reported sexual coercion and violence in their marriages, yet most did not label those experiences as “rape” despite the threatening context in which these incidents occurred. Tacit, but not always explicit acceptance of machismo, patriarchy, and male dominance were common themes possibly increasing IPV risk. Results highlight the complex interaction between upholding cultural values on the one hand, and preserving individual well-being and safety, on the other, underscoring the need for more extensive culturally sensitive research, prevention and intervention efforts for abused Mexican-American women 相似文献
872.
Stanislas Talaga Olivier Dézerald Alexis Carteron Céline Leroy Jean-François Carrias Régis Céréghino Alain Dejean 《Urban Ecosystems》2017,20(5):1001-1009
Due to habitat fragmentation, resource disruption and pollution, urbanization is one of the most destructive forms of anthropization affecting ecosystems worldwide. Generally, human-mediated perturbations dramatically alter species diversity in urban sites compared to the surroundings, thus influencing the functioning of the entire ecosystem. We investigated the taxonomic and functional diversity patterns of the aquatic macroinvertebrate communities in tank bromeliads by comparing those found in a small Neotropical city with those from an adjacent rural site. Changes in the quality of detrital inputs in relation to lower tree diversity and the presence of synanthropic species are likely important driving forces behind the observed structural changes in the urban site. Leaf-litter processors (i.e., shredders, scrapers) were positively affected in the urban site, while filter-feeders that process smaller particles produced by the activity of the shredders were negatively affected. Because we cannot ascertain whether the decline in filter-feeders is related to food web-mediated effects or to competitive exclusion (Aedes aegypti mosquitoes were present in urban bromeliads only), further studies are necessary to account for the effects of intra-guild competition or inter-guild facilitation. 相似文献
873.
Mark E. Mitchell Stephen F. Matter Richard D. Durtsche Ishi Buffam 《Urban Ecosystems》2017,20(5):1121-1133
Green roofs are emerging engineered ecosystems that provide multiple benefits, but many are constructed with nutrient-rich substrate and have been found to leach out high levels of phosphorus (P) in runoff. It is unclear, however, how long green roofs act as sources of P or what mechanisms are responsible for these net losses. We measured P concentrations in runoff water over 4 years from a 1–5 year old extensive green roof in Cincinnati, OH, USA, produced a model to predict runoff P levels into the future, and validated predictions using runoff from 2 nearby extensive green roofs. P concentrations in runoff from the focal green roof were on par with heavily fertilized agroecosystems and displayed strong seasonal dynamics and a rapid decline over the 4-year study. Runoff measurements and changes in substrate P content over a 2-year period were used to estimate a mass balance for green roof P. P loss from the substrate was substantial (4.55 ± 2.3 g P/m2/yr), but only a small portion of the loss was attributable to leaching of P in runoff (0.19–0.65 g P/m2/yr). Missing P may be attributed to a combination of plant uptake and altered P form and binding strength, but further research is needed to precisely identify the mechanisms of P depletion. Our results also suggest that these and similar extensive green roofs are likely to act as environmentally significant sources of P for 10 or more years following roof installation, highlighting the need for reductions in initial substrate P content. 相似文献
874.
875.
S. T. A. Pickett M. L. Cadenasso E. J. Rosi-Marshall K. T. Belt P. M. Groffman J. M. Grove E. G. Irwin S. S. Kaushal S. L. LaDeau C. H. Nilon C. M. Swan P. S. Warren 《Urban Ecosystems》2017,20(1):1-14
Urban areas are understood to be extraordinarily spatially heterogeneous. Spatial heterogeneity, and its causes, consequences, and changes, are central to ecological science. The social sciences and urban design and planning professions also include spatial heterogeneity as a key concern. However, urban ecology, as a pursuit that integrates across these disciplines, lacks a theoretical framework that synthesizes the diverse and important aspects of heterogeneity. This paper presents the concept of dynamic heterogeneity as a tool to explore how social and ecological heterogeneities interact and how they together act as both an outcome of past interactions and a driver future heterogeneity and system functions. To accomplish this goal, we relate heterogeneity to the fundamental concept of the human ecosystem. The human ecosystem concept identifies key processes that require operationalized models of dynamic heterogeneity in three process realms: the flow of materials, the assembly of urban ecosystem biota, and the locational choices humans make concerning land. We exemplify a specific dynamic model of heterogeneity in each of these realms, and indicate a range of complementary statistical approaches to integrate the drivers and outcomes of dynamic heterogeneity across the three realms. We synthesize a hierarchical framework for a theory of dynamic urban heterogeneity, noting its complementarity to other major urban theories and general model approaches. We hypothesize that human actions and structures amplify the dynamics of heterogeneity in urban systems. 相似文献
876.
The aim is to refine recent discussion about the process of compensation under conditions of organic impairment in order to better understand how the concept has been addressed by cultural-historical researchers. From a dialogue among contemporary authors and the examination of the case of a student with multiple disabilities confronting the schooling process, we draw attention to how meaning has an effect upon complex functional systems and paves the way for new forms of human development. We conclude that it is important to challenge the relevance of the term compensation in its connection with the notion of human constitution. 相似文献
877.
Peter Van Aelst Patrick van Erkel Evelien D’heer Raymond A. Harder 《Information, Communication & Society》2017,20(5):715-732
Attention in the mass media is seen as crucial for electoral success. However, most ordinary candidates hardly get any attention in the news. With social media outlets becoming ever more popular, the question is whether the overall asymmetry in attention for candidates still holds today. Do candidates who dominate the traditional media during the campaign also dominate the social media? Or can candidates make up for a lack of mass media coverage by attracting attention on these new media platforms? This paper aims to answer these questions by pairing Twitter activity and Twitter popularity with newspaper attention for a large number of individual candidates in the 2014 Belgian election campaign. We expand the normalization versus equalization debate by not only looking at how much a new medium is used, but also at its success in terms of popularity and audience reach. Our findings show that the two platforms are indeed related, mainly because a small political elite dominates both old and new media. Twitter popularity and Twitter activity (albeit to a lesser extent) are higher among powerful politicians. We elaborate on why these findings are so much in line with the normalization hypothesis. 相似文献
878.
879.
Hannah C. Espeleta Jennifer D. Shields Nichelle L. Huber Tabitha C. Fleming Erin K. Taylor Lana O. Beasley 《Journal of Child Custody》2017,14(4):281-294
This study assessed the knowledge and attitudes of young adults without children in regard to discipline and parenting practices. A qualitative design was utilized (n?=?26) with semistructured focus groups. Results indicated participants believed discipline is important, with spanking and loss of privileges being the most effective strategy for behavior change. The majority of participants reported plans to discipline future children the way in which they were disciplined, suggesting a high percentage intend to utilize spanking. Findings suggest that personal experiences shape parenting beliefs, attitudes, and knowledge. Results inform efforts at educating future parents on appropriate parenting practices and indicate the need for protocols for young adults to educate about practices that may diverge from their personal experiences. 相似文献
880.
Benjamin Hearn Michael D. Brubaker Amanda C. La Guardia 《Journal of LGBT Issues in Counseling》2017,11(4):247-258
ABSTRACTGiven that many professional organizations emphasize the need for comparing assessment results to appropriate reference groups in their codes of ethics, we consider this practice through an ecological perspective as it applies to the lesbian, gay, and bisexual (LGB) population. The purpose of norming and types of assessment bias is discussed with respect to LGB population, which frequently lack specific norming data. The authors discuss whether the LGB population has characteristics similar to other commonly normed for groups and explore how group-shared constructs such as minority stress and internalized homophobia may introduce bias and affect the validity of assessments. A social anxiety assessment as well as a personality disorder inventory are examined for bias as case examples explaining how these assessments may exhibit bias when used with the LGB population. Increases in validity and effects on treatment planning are discussed as benefits of providing LGB-specific norms. Risks of providing these norms, such as minimizing subgroup differences and possibly increasing the risk of discrimination are also addressed before providing clinicians with recommendations as to how they may minimize the risk of bias in their assessment process. 相似文献