全文获取类型
收费全文 | 20612篇 |
免费 | 585篇 |
国内免费 | 16篇 |
专业分类
管理学 | 2624篇 |
民族学 | 108篇 |
人才学 | 1篇 |
人口学 | 1795篇 |
丛书文集 | 173篇 |
理论方法论 | 1863篇 |
综合类 | 815篇 |
社会学 | 10357篇 |
统计学 | 3477篇 |
出版年
2023年 | 115篇 |
2021年 | 135篇 |
2020年 | 315篇 |
2019年 | 415篇 |
2018年 | 485篇 |
2017年 | 707篇 |
2016年 | 480篇 |
2015年 | 412篇 |
2014年 | 470篇 |
2013年 | 3484篇 |
2012年 | 699篇 |
2011年 | 660篇 |
2010年 | 567篇 |
2009年 | 482篇 |
2008年 | 601篇 |
2007年 | 619篇 |
2006年 | 594篇 |
2005年 | 508篇 |
2004年 | 424篇 |
2003年 | 368篇 |
2002年 | 409篇 |
2001年 | 500篇 |
2000年 | 426篇 |
1999年 | 414篇 |
1998年 | 319篇 |
1997年 | 287篇 |
1996年 | 272篇 |
1995年 | 272篇 |
1994年 | 237篇 |
1993年 | 281篇 |
1992年 | 313篇 |
1991年 | 301篇 |
1990年 | 302篇 |
1989年 | 261篇 |
1988年 | 267篇 |
1987年 | 294篇 |
1986年 | 238篇 |
1985年 | 232篇 |
1984年 | 282篇 |
1983年 | 237篇 |
1982年 | 232篇 |
1981年 | 180篇 |
1980年 | 192篇 |
1979年 | 224篇 |
1978年 | 163篇 |
1977年 | 156篇 |
1976年 | 158篇 |
1975年 | 184篇 |
1974年 | 148篇 |
1972年 | 116篇 |
排序方式: 共有10000条查询结果,搜索用时 109 毫秒
851.
Austerity places intense pressures on labour costs in paid care. In the UK, electronic monitoring technology has been introduced to record (and materially reduce) the working time and wages of homecare workers. Based on empirical findings, we show that, in a ‘time of austerity’, care is reductively constructed as a consumption of time. Service users are constructed as needy, greedy, time‐consumers and homecare workers as resource‐wasting time‐takers. We point to austerity as a temporal ideology aimed at persuading populations that individual deprivation in the present moment, self‐sacrifice and the suppression of personal need in the here and now is a necessary requirement to underpin a more secure national future. Accordingly, women in low‐waged care work are required to eschew a rights‐bearing, present‐tense identity and are assumed willing to suppress their entitlements to lawful wages as a sacrifice to the future. By transforming our understandings of ‘care’ into those of ‘time consumption’, and by emphasizing the virtue of present‐tense deprivation, a politics of austerity appears to justify time‐monitoring in care provision and the rationing of homecare workers’ pay. 相似文献
852.
Molly R. Wolf Rebecca K. Eliseo-Arras Megan Brenner Thomas H. Nochajski 《Journal of Family Social Work》2017,20(1):26-40
ABSTRACTMilitary families face not only the same challenges as other families, but also unique issues due to their military involvement. Parenting programs for civilian families can be helpful, but they do not generally cover the specific issues faced by military families. The purpose of this qualitative study was to gather information from a focus group of eight service providers about the types of issues that affect military families, such that content and delivery of workshops at a social service agency could be formed to specifically cater to military families. This study utilized a phenomenological approach, and analyses revealed areas for social service involvement around the cycle of deployment. Specifically, social services could be helpful by using psychoeducational and normalization techniques around the five major themes that resulted from this study: (1) the issues of servicemembers psychologically withdrawing before deployment, (2) family cohesion and connectedness during and after deployment, (3) family stability during reintegration of the service member, (4) military families experience many of the same challenges that nonmilitary families do (such as domestic violence and financial issues), and (5) utilizing a military culture framework for all military family programs. 相似文献
853.
The Impact of Adolescents' Classroom and Neighborhood Ethnic Diversity on Same‐ and Cross‐Ethnic Friendships Within Classrooms
下载免费PDF全文
![点击此处可从《Journal of research on adolescence》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Anke Munniksma Peer Scheepers Tobias H. Stark Jochem Tolsma 《Journal of research on adolescence》2017,27(1):20-33
This study examines how classroom and neighborhood ethnic diversity affect adolescents' tendency to form same‐ versus cross‐ethnic friendships when they enter middle school. Hypotheses are derived from exposure, conflict, and constrict theory. Hypotheses are tested among 911 middle school students (43 classrooms, nine schools) in the Netherlands. Multilevel (p2) social network analyses show that students were more likely to engage in same‐ethnic rather than cross‐ethnic friendships. In line with conflict theory, greater classroom and neighborhood diversity were related to stronger tendencies to choose same‐ethnic rather than cross‐ethnic friends, among both ethnic majority and minority students. Diversity did not hamper reciprocity, as students in more ethnically diverse classrooms were even more likely to reciprocate friendships. 相似文献
854.
Developmental Latent Patterns of Identification as Mostly Heterosexual Versus Lesbian,Gay, or Bisexual
下载免费PDF全文
![点击此处可从《Journal of research on adolescence》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Jerel P. Calzo Katherine E. Masyn S. Bryn Austin Hee‐Jin Jun Heather L. Corliss 《Journal of research on adolescence》2017,27(1):246-253
Scant research exists on the development of mostly heterosexual identity, the largest sexual orientation minority subgroup. We used longitudinal latent class analysis to characterize the patterns of identification with lesbian, gay, bisexual (LGB), or mostly heterosexual identities from ages 12 to 23 in 13,859 youth (57% female) in a U.S. national cohort. Three classes emerged: completely heterosexual (88.2%), mostly heterosexual (9.5%), and LGB (2.4%). LGB class youth generally identified with sexual minority identities by ages 12–17. In contrast, mostly heterosexual class youth identified with sexual minority identities gradually, with steady increases in endorsement starting at the age of 14. Developmental implications of these differential patterns are discussed. 相似文献
855.
Sandeep Mishra Martin L. Lalumière Robert J. Williams 《Journal of gambling studies / co-sponsored by the National Council on Problem Gambling and Institute for the Study of Gambling and Commercial Gaming》2017,33(1):15-36
Research suggests that high frequency gambling is a component of the “generality of deviance”, which describes the observation that various forms of risky and antisocial behavior tend to co-occur among individuals. Furthermore, risky and antisocial behaviors have been associated with such personality traits as low self-control, and impulsivity, and sensation-seeking. We conducted a replication (and extension) of two previous studies examining whether high frequency gambling is part of the generality of deviance using a large and diverse community sample (n = 328). This study was conducted as a response to calls for more replication studies in the behavioral and psychological sciences (recent systematic efforts suggest that a significant proportion of psychology studies do not replicate). The results of the present study largely replicate those previously found, and in many cases, we observed stronger associations among measures of gambling, risk-taking, and antisocial behavior in this diverse sample. Together, this study provides evidence for the generality of deviance inclusive of gambling (and, some evidence for the replicability of research relating to gambling and individual differences). 相似文献
856.
Jacqueline Huscroft-D’Angelo Alexandra L. Trout Matthew C Lambert Ronald Thompson 《Journal of Family Social Work》2017,20(5):433-456
ABSTRACTResidential care is one of the most restrictive out-of-home care settings; however, this is a temporary placement and youth eventually reintegrate into the home and community setting. Reintegration presents many challenges, and aftercare becomes critical for maintaining youth gains and promoting family stability. Aftercare programs and supports should align to individual family needs that entail understanding individual and familial characteristics. Previous studies have explored characteristics related to family functioning, mental health, behavior, and perceptions of need during reintegration; yet little is known regarding how affective characteristics (i.e., self-efficacy, empowerment) factor into reintegration, or the implications this may have for providers. The purpose of this study was to address this gap by exploring empowerment and self-efficacy in caregivers (N = 120) who had a child return home within 1 month of departing residential care. Overall, caregivers reported high levels of empowerment and self-efficacy during the initial transition period. Significant differences for empowerment and self-efficacy were present in characteristics such as race, income, number of children in the home, and free/reduced lunch status. 相似文献
857.
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
858.
Soil nitrogen (N) mineralization is an important process determining terrestrial N availability, and evidence suggests elevated temperatures will enhance N mineralization rates. Along a 40 km urban-rural gradient of chestnut oak forest stands in Louisville, KY, we expected N mineralization rates would be higher in urban than in rural forests in part due to increased temperatures caused by the urban heat island. However, a 12-month field study along this Louisville gradient showed that annual N mineralization rates were lower in urban than in rural stands. Since variation in precipitation inputs and other factors across this land-use gradient may be influencing soil N mineralization rates, we conducted a three-month soil incubation experiment in the lab to determine the extent to which a + 2 °C temperature difference could affect soil N mineralization in urban and rural soils. Across the range of temperatures tested, rural soils mineralized N at twice the rate of urban soils under base (7.86 vs. 3.65 mg N kg?1 AFDW soil d?1) and elevated (9.08 vs. 4.76 mg N kg?1 AFDW soil d?1) temperatures (p < 0.01). A 2 °C temperature difference, did not significantly alter total inorganic N production in urban (p = 0.272) or rural soils (p = 0.293). The proportion of nitrate produced was lower in the urban (15.1 %) than in the rural soils (72.3 %; p < 0.01). These results suggest that differences in soil organic matter quality and potentially decomposer community composition are the primary explanatory factors for forests along this Louisville gradient. 相似文献
859.
Adrià López-Baucells Xavier Puig-Montserrat Ignasi Torre Lídia Freixas Maria Mas Antoni Arrizabalaga Carles Flaquer 《Urban Ecosystems》2017,20(1):217-225
Impact mitigation practices are currently one of the hottest topics in conservation and regarded as priorities worldwide. Forest bat populations are known to provide important ecosystem services such as pest control and bat boxes have become one of the most popular management options for counteracting the loss of roosts. However, bat boxes tend to be employed in non-native forests near highly humanized areas where human disturbance is higher. The aim of this study was to evaluate how the surrounding landscape composition affects bat box occupancy in urban non-native forests along the Mediterranean corridor in the Northeastern Iberian Peninsula. Two hundred wooden bat boxes were monitored in young non-native forests in the period 2004–2012. The influence of land cover on occupancy rate of bat boxes was analysed at the landscape level in a 5 km buffer around bat-box stations. In total, 1659 inspections were carried out, in which a 15 % occupancy rate was detected. Bat boxes hosted three different species (Pipistrellus pygmaeus, Pipistrellus kuhlii and Nyctalus leisleri). More than 70 % of the occupancy can be explained by habitat and spatial composition. The presence of urban areas around bat boxes tends to have a negative impact on bat occupation rates; by contrast, forest coverage has a positive effect, especially for the tree-dwelling bats. These patterns could be associated with the large number of available roosts in buildings, microhabitat or phylopatry. Thus, to increase success, we suggest that landscape composition should be considered when using bat boxes for conservation. 相似文献
860.
In sprawling metropolitan areas, residential landscaping is a major concern with respect to biodiversity conservation, and it could play a critical role in conserving wildlife habitat. In the United States, residential landscaping typically consists of maintained lawns with specimen plantings of non-native trees and shrubs; such designs provide poor habitat for urban wildlife species. We conducted a case study of Raleigh, North Carolina residents to determine how providing information about the benefits of native plant landscaping to bird species influenced urban residents’ landscaping preferences. We used Wilcoxon Signed Rank tests to determine if respondent preferences for 0, 50, 75 and 100 % native plant landscaping coverages changed after residents were informed about the benefits that native plants provide for birds. Initially, the 50 % native landscaping coverage was most preferred by residents; however, preferences for all four native plant landscaping coverage designs were significantly different after the informational treatment. Neutrality changed to opposition for the 0 % native plant coverage, while opposition changed to support and neutrality for the 75 and 100 % native plant coverage designs, respectively. After the informational treatment, the 50 and 75 % native plant landscaping coverage had the highest mean preference levels, although the 100 % design was ranked first more than any other design. Our findings suggest that residential support for native plant landscaping is higher than is reflected by typical residential landscaping practices, and that dissemination of information regarding the benefits of native plant landscaping to birds could alter public preferences for native plant landscaping. 相似文献