首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   718篇
  免费   63篇
管理学   35篇
民族学   10篇
人口学   86篇
丛书文集   3篇
理论方法论   82篇
综合类   2篇
社会学   555篇
统计学   8篇
  2024年   3篇
  2023年   15篇
  2022年   3篇
  2021年   11篇
  2020年   26篇
  2019年   51篇
  2018年   50篇
  2017年   59篇
  2016年   43篇
  2015年   36篇
  2014年   38篇
  2013年   119篇
  2012年   38篇
  2011年   40篇
  2010年   25篇
  2009年   15篇
  2008年   20篇
  2007年   29篇
  2006年   21篇
  2005年   19篇
  2004年   23篇
  2003年   8篇
  2002年   11篇
  2001年   10篇
  2000年   6篇
  1999年   10篇
  1998年   3篇
  1997年   6篇
  1996年   9篇
  1995年   3篇
  1994年   4篇
  1993年   7篇
  1992年   6篇
  1991年   2篇
  1990年   1篇
  1985年   2篇
  1984年   1篇
  1982年   3篇
  1981年   1篇
  1979年   2篇
  1978年   1篇
  1973年   1篇
排序方式: 共有781条查询结果,搜索用时 15 毫秒
771.
772.
Most provisions in the Affordable Care Act that affect nursing homes originated in two earlier attempts at reform, both of which failed multiple times in prior Congressional sessions: the Elder Justice Act and the Nursing Home Transparency and Improvement Act. Both of these earlier efforts focused on improving quality and reducing elder abuse in nursing homes by strengthening oversight and enforcement penalties, expanding staff training, and increasing the information on nursing home quality available to consumers and regulators. Each bill addressed problems that were serious, widespread, and had persisted for years, but each failed to pass on its own. The Affordable Care Act, with its own momentum, became the vehicle for their passage. However, the reasons the bills failed in these earlier efforts suggest implementation challenges now that they have ridden into law on the coattails of the more general effort to reform the health care sector.  相似文献   
773.
Policies and programs designed to serve children and families are sometimes misaligned with developmental science research. Broad child neglect reporting laws, first adopted by the United States in 1974, have led to families being prosecuted by child protection authorities for allowing children to participate in everyday age-appropriate activities unsupervised. In this report we describe the challenges of defining child neglect and outline the current landscape of neglect laws in the United States. We then provide a broad overview of some of the developmental milestones children need to reach to participate in unsupervised activities and the benefits of independent activities on child development. Children can often accomplish tasks at a much younger age than law, parents, and caregivers in the U.S. believe. We then turn to the literature from across the world and argue that culture, not innate ability, drives much of the variation in the age at which children can do things on their own. Finally, we make recommendations to parents, caregivers, legislators, advocates, and developmental scientists to better align practice with research. This is a social justice issue that should resonate across party, racial, and class lines. Developmental scientists are needed as advocates and advisors on policies impacting children and families, especially child neglect laws.  相似文献   
774.

Niche partitioning reduces interspecific competition, facilitating coexistence. In urban ecosystems, however, habitat loss reduces species’ ability to spatially partition activity. Temporal partitioning may thus increase in urban areas as species, unable to avoid each other spatially, partition time to avoid competition. In Midwestern US cities, eastern gray squirrels (Sciurus carolinensis) and fox squirrels (S. niger) co-occur and compete for resources. We identified urban gray and fox squirrel activity patterns and how they vary with season, land cover, and among sites where they do and do not co-occur using camera-trap data. Both species’ activity patterns varied with season and canopy and impervious surface cover. Gray squirrel activity patterns varied in the presence of fox squirrels only in the fall, providing limited support for our temporal partitioning hypothesis. Temporal niche partitioning may thus play a role in supporting these species co-existence when competition is seasonally-elevated (e.g., fall hording), but appears less important in other seasons.

  相似文献   
775.
The bullwhip effect describes the tendency for the variance of orders in supply chains to increase as one moves upstream from consumer demand. We report on a set of laboratory experiments with a serial supply chain that tests behavioral causes of this phenomenon, in particular the possible influence of coordination risk. Coordination risk exists when individuals' decisions contribute to a collective outcome and the decision rules followed by each individual are not known with certainty, for example, where managers cannot be sure how their supply chain partners will behave. We conjecture that the existence of coordination risk may contribute to bullwhip behavior. We test this conjecture by controlling for environmental factors that lead to coordination risk and find these controls lead to a significant reduction in order oscillations and amplification. Next, we investigate a managerial intervention to reduce the bullwhip effect, inspired by our conjecture that coordination risk contributes to bullwhip behavior. Although the intervention, holding additional on‐hand inventory, does not change the existence of coordination risk, it reduces order oscillation and amplification by providing a buffer against the endogenous risk of coordination failure. We conclude that the magnitude of the bullwhip can be mitigated, but that its behavioral causes appear robust.  相似文献   
776.
This study examines young children's career aspirations, gender differences in those aspirations, and children's perceptions of the amount of math and science used in careers. We asked 1634 students in first to third grades what job they wanted in the future and how much they thought they would use math or science in it. Career aspirations were sorted into 27 career categories, of which 12 showed significant gender differences. Notably, boys were more likely to indicate military, manual labor, and math/computer science careers, and girls were more likely to indicate stay at home parent, education, and animal care careers. Students aspiring to science, technology, engineering, and mathematics (STEM) careers thought they would use science, but not math, more than non-STEM-aspiring students did. School counseling interventions focused on specific STEM subfields, and education highlighting links between school subjects and careers requirements may benefit students and reduce gender inequality in STEM fields.  相似文献   
777.
Early childbirth is common among young women ageing out of foster care and may impede their educational progress. However, few studies have explored access to postsecondary education among young mothers who have been in foster care. The present study used data from a large, national sample of young people in foster care (National Youth in Transition Database, NYTD) to examine the link between early childbirth and young women's access to postsecondary education between ages 19 and 21, controlling for an array of covariates. The study sample included 2,207 young women who had completed a high school diploma or GED by age 19 and who participated in three NYTD interviews at ages 17, 19 and 21. Childbirth between ages 19 and 21 was linked to decreased access to postsecondary education. However, no relationship was found between access to postsecondary education and childbirth by age 17 or childbirth between ages 17 and 19. Implications for policy, practice and research are discussed.  相似文献   
778.
Although there has been considerable research about attitudes towards LGBTQ+ people, there has been little research into how people first come to be aware of minoritized sexual and gender minority (SGM) identities. This study sought to address this gap. A sample of sexual minority (= 150) and heterosexual (= 802) young adults (= 952; Mage = 18.88 years, SD = 1.75; 949 were cisgender, three were transgender), primarily recruited from a large southern university, were asked retrospectively to recount their first exposure to or awareness of SGM identities. Responses between SGM and heterosexual participants were compared through a variety of analytical approaches, including analyzing themes about the source from which participants first recalled encountering these identities, and whether understanding about these identities came through a personal connection to someone with these identities. SGM participants reported encountering minoritized sexual identities a year earlier than did heterosexual participants, with both groups encountering these concepts in middle childhood, on average. SGM participants were more likely than heterosexual participants to report learning about minoritized gender identities from someone with a minoritized gender identity, while heterosexual participants more often reported learning about these identities from media or celebrities. Heterosexual (vs. SGM) participants were also more likely to imply that minoritized gender identities were adopted to be popular, rather than being authentic identities in themselves. Framed by developmental intergroup theory (DIT), we discuss implications of these findings, especially potential interrelationships with the development of prejudiced attitudes about SGM identities.  相似文献   
779.
Whereas the desire for revenge for an unjust deed is considered natural, its use within the therapeutic setting is scarce, specifically in sexually victimized children. The study aimed to find how experiencing sexual molestation during childhood and the revenge fantasy is reflected in drawings and narratives of sexually victimized children. Following ethical approval and signing a consent form, 14 children who experienced sexual abuse and were psychologically treated (ages 11–18) were recruited. They were asked to draw two drawings: “draw an unjust event that had happened to you” and “draw what you would have liked to happen to the person that unjustly treated you.” At completion, participants were asked to give a narrative to each drawing. Phenomenological analysis of the drawings and narratives indicated that most participants refrained from using more than two colours, did not draw the perpetrator and drew schematic figures. The main themes that emerged in the drawings and the narratives were feeling of loneliness, aloneness, and the desire for role reversal.  相似文献   
780.
Studies have highlighted the political, economic, and psychological factors in the debate over anthropogenic climate change—a hegemony approach—but have rarely focused on the stories and possibilities of people's transitions from climate change non-believer to climate change believer. Based on publicly accessible narratives, this study examines the stories of those who have switched from non-believer to believer—a narrative approach—and the dilemmas involved in those switches. Our investigation illuminates that a transition to climate change believer is a cultural and moral matter based on changing social relations of knowledge and what people regard as ignorable. We find that narratives of transition commonly describe interrelated shifts in three social relational factors: the narrator's notions of self, material reality, and justice. We term this contextualized transformative experience a relational rupture. Our narrative approach thus contextualizes climate change denialism within a person's web of social relations, not the hegemony of climate change communication alone. Moreover, we suggest that, since public debate and polarization on scientific topics such as climate change, vaccination, and COVID-19 are socially situated, they may potentially be socially bridged.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号