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   692篇
  免费   49篇
管理学   79篇
民族学   9篇
人口学   105篇
丛书文集   4篇
理论方法论   87篇
综合类   4篇
社会学   411篇
统计学   42篇
  2024年   3篇
  2023年   11篇
  2022年   11篇
  2021年   14篇
  2020年   18篇
  2019年   36篇
  2018年   44篇
  2017年   58篇
  2016年   33篇
  2015年   42篇
  2014年   35篇
  2013年   115篇
  2012年   27篇
  2011年   55篇
  2010年   17篇
  2009年   20篇
  2008年   29篇
  2007年   30篇
  2006年   20篇
  2005年   15篇
  2004年   13篇
  2003年   10篇
  2002年   9篇
  2001年   5篇
  2000年   9篇
  1999年   10篇
  1998年   5篇
  1997年   4篇
  1996年   5篇
  1995年   6篇
  1994年   2篇
  1993年   4篇
  1992年   3篇
  1991年   5篇
  1990年   3篇
  1989年   2篇
  1988年   2篇
  1986年   2篇
  1985年   3篇
  1984年   2篇
  1982年   1篇
  1976年   2篇
  1975年   1篇
排序方式: 共有741条查询结果,搜索用时 15 毫秒
111.
Meerow  Sara  Helmrich  Alysha M.  Andrade  Riley  Larson  Kelli L. 《Urban Ecosystems》2021,24(5):989-1000
Urban Ecosystems - Green infrastructure is an increasingly popular strategy to simultaneously address challenges associated with urbanization and global environmental change, including increased...  相似文献   
112.
The current study examined whether characteristics of adolescents (i.e., externalizing problems) and their environments (i.e., social support, adverse childhood experiences) relate to academic goal setting, appraisals, and outcomes. Adolescents (n = 99; 87% Black/African American) 13–16 years old completed baseline interviews, and 80% also completed follow‐up interviews. Adolescents with more externalizing problems set fewer academic goals, and youth with social networks characterized by greater support (and less strain) appraised their academic goals as more supported and achievable. Adolescents’ appraisals of their academic goals, but not how many academic goals they had, predicted grades at follow‐up. Increasing social support (and reducing social strain) may foster adolescents’ positive appraisals of their academic goals, which may promote academic achievement.  相似文献   
113.
Colored maps depicting electoral results may exacerbate perceptions of polarization, rather than merely reflecting them. Participants viewed maps of state-by-state Presidential election results that were either Electoral (red/Republican or blue/Democrat) or Proportional (purples that proportionally reflected each group's support). Half of the maps also displayed state-level numeric electoral results. Participants viewing Electoral maps perceived the nation as more politically divided, stereotyped the political beliefs of residents of various states more, and saw people holding views in the political minority as less agentic and less likely to vote. These differences occurred even in the presence of numeric data. Implications of these findings for intergroup perception in several domains are discussed, including the impact of electoral depictions on political campaigns and elections .  相似文献   
114.
Pharmacogenetics (PGx) – the study of DNA variation in the human genome and the way this impacts the efficacy and safety of medicines – is becoming an increasingly important research tool as physicians, patients, regulatory authorities and payers look for innovative ways to improve the risk:benefit ratio of medicines. While scientific knowledge about PGx is rapidly increasing, implementation of PGx findings to patient care has yet to be fully achieved. One area where significant progress has been made is in the identification of PGx markers associated with variable response to antiretroviral medicines. For example, the major histocompatibility complex HLA‐B*5701 allele has been associated with hypersensitivity to abacavir (ABC) by several independent researchers. While PGx associations have been identified largely through retrospective examination, the clinical utility of these PGx markers in patient care has not been prospectively determined in a randomized study. This paper outlines the design of a study to evaluate the utility of prospective screening for HLA‐B*5701 to reduce the incidence of ABC hypersensitivity in an ABC‐naïve population of HIV‐infected subjects. This represents the first fully powered, randomized, blinded, prospective study to determine the clinical utility of PGx screening to reduce drug‐associated adverse events in any patient population. This type of trial design may have utility for other important medicines which have treatment‐limiting side effects. Copyright © 2007 John Wiley & Sons, Ltd.  相似文献   
115.
The number of individuals with Alzheimer's disease or a related dementia is growing at a staggering rate. Thus, it is essential that social workers in geriatric settings are knowledgeable about this disorder and the appropriate interventions to use at all stages of the disease. The purpose of this article is to examine the types of non-pharmacological, psychosocial treatments that are used to manage the behavioral manifestations and changes in the mood of individuals with Alzheimer's disease or a related dementia. While great strides have been made in pharmacological treatments of Alzheimer's disease, less attention has been given to the types of psychosocial interventions that are readily employed in community-based and long-term care settings to assist in the care of these individuals. This article provides an overview of psychosocial interventions, as well as identifies the direction for future evidence-based treatment studies, for individuals with Alzheimer's disease and related dementia.  相似文献   
116.
Abstract. This paper argues that preference change could explain, in part, the growth of within‐group wage inequality in the USA and the UK in the 1980s. The absence of such preference change in continental European countries might also help explain why their wage inequality did not rise in the same way. The argument relies on evidence from the World Values Surveys and uses an efficiency wage model of within‐group wage inequality where there are differences in the degree of discretion at work across firms and workers value not just the wage but also the degree of discretion on the job.  相似文献   
117.
118.
We use data from the Fragile Families and Child Wellbeing Study to investigate the association between coparenting quality and nonresident fathers' involvement with children over the first five years after a nonmarital birth. We find that about one year after a nonmarital birth, 48% of fathers are living away from their child, rising to 56% and then to 63% at three and five years, respectively Using structural equation models to estimate cross-lagged effects, we find that positive coparenting is a strong predictor of nonresident fathers' future involvement, whereas fathers' involvement is only a weak (but significant) predictor of future coparenting quality. The positive effect of coparenting quality on fathers' involvement is robust across several techniques designed to address unobserved heterogeneity and across different strategies for handling missing data. We conclude that parents' ability to work together in rearing their common child across households helps keep nonresident fathers connected to their children and that programs aimed at improving parents' ability to communicate may have benefits for children irrespective of whether the parents' romantic relationship remains intact.  相似文献   
119.
This paper uses data from the Fragile Families and Child Wellbeing Study to test the hypotheses that (1) similar to other positive pre- and post-natal outcomes, Mexican immigrant mothers are more likely to breastfeed, and to breastfeed longer, than white or Mexican-American mothers; and (2) acculturation accounts for the ethnic/nativity differential in breastfeeding initiation and duration. The results support both hypotheses. Mexican immigrants to the U.S. are much more likely than whites to breastfeed, and to breastfeed longer. Mexican-American mothers, after controlling for background characteristics, have similar initiation and duration to whites. Using expanded acculturation measures developed for this paper, acculturation accounts for some of the difference between whites and Mexican immigrants in breastfeeding initiation, and much of the difference for breastfeeding duration. The results suggest that low levels of acculturation operate to protect Mexican immigrants from choosing to formula-feed, which gives their babies many health advantages, and may be associated with better health outcomes across the life course. The results also suggest that successive generations of Mexican immigrants may abandon breastfeeding, which is deleterious for their infants.  相似文献   
120.
Industrial statistics plays a major role in the areas of both quality management and innovation. However, existing methodologies must be integrated with the latest tools from the field of Artificial Intelligence. To this end, a background on the joint application of Design of Experiments (DOE) and Machine Learning (ML) methodologies in industrial settings is presented here, along with a case study from the chemical industry. A DOE study is used to collect data, and two ML models are applied to predict responses which performance show an advantage over the traditional modeling approach. Emphasis is placed on causal investigation and quantification of prediction uncertainty, as these are crucial for an assessment of the goodness and robustness of the models developed. Within the scope of the case study, the models learned can be implemented in a semi-automatic system that can assist practitioners who are inexperienced in data analysis in the process of new product development.  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