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   899篇
  免费   54篇
管理学   156篇
民族学   7篇
人口学   75篇
丛书文集   5篇
理论方法论   128篇
综合类   14篇
社会学   477篇
统计学   91篇
  2023年   9篇
  2022年   4篇
  2021年   9篇
  2020年   19篇
  2019年   27篇
  2018年   34篇
  2017年   50篇
  2016年   40篇
  2015年   23篇
  2014年   28篇
  2013年   121篇
  2012年   42篇
  2011年   43篇
  2010年   34篇
  2009年   28篇
  2008年   39篇
  2007年   36篇
  2006年   35篇
  2005年   27篇
  2004年   41篇
  2003年   30篇
  2002年   28篇
  2001年   20篇
  2000年   19篇
  1999年   11篇
  1998年   14篇
  1997年   12篇
  1996年   11篇
  1995年   4篇
  1994年   7篇
  1993年   9篇
  1992年   9篇
  1991年   8篇
  1990年   10篇
  1987年   7篇
  1986年   3篇
  1985年   6篇
  1984年   4篇
  1982年   9篇
  1981年   3篇
  1980年   5篇
  1979年   2篇
  1978年   6篇
  1977年   4篇
  1976年   3篇
  1975年   2篇
  1974年   3篇
  1973年   2篇
  1972年   2篇
  1971年   2篇
排序方式: 共有953条查询结果,搜索用时 631 毫秒
241.
Background.?Saliva collection is an easy, non-invasive method to measure hormones.

Methods.?Two studies were performed. In the first, a convenience sample of 1454 males who had submitted saliva for salivary testosterone measurements were studied. In the second study, we intensively studied symptoms and measurements of total testosterone, free testosterone symptoms and measurements of total testosterone, free testosterone and bioavailable testosterone in relationship to salivary testosterone in 127 men. A secondary endpoint was to examine the relationship of salivary testosterone to hypogonadal symptoms in the ADAM and AMS questionnaires.

Results.?In the first study, we have shown that salivary testosterone, measured in 1454 males aged 20 to 89 years, declines by 47% over the lifespan. In the second study, salivary testosterone was strongly correlated with bioavailable testosterone (p < 0.000001) calculated free testosterone (p < 0.00001) and total testosterone (p < 0.002). Salivary testosterone was significantly related to hypogonadal symptoms on the St. Louis University ADAM questionnaire and the Aging Male Survey.

Conclusions.?These studies support the use of salivary testosterone as an acceptable assay for screening for hypogonadism. Salivary testosterone is not a better assay than other measures to diagnose hypogonadism.  相似文献   
242.
Drawing on Charles Tilly’s work on inequality, democracy and cities, we explore the local level dynamics of democratization across urban settings in India, South Africa, and Brazil. In all three cases, democratic institutions are consolidated, but there is tremendous variation in the quality of the democratic relationship between cities and their citizens. We follow Tilly’s focus on citizenship as the key element in democratization and argue that explaining variance across our three cases calls for analyzing patterns of inequality through the kind of relational lens used by Tilly and recognizing that patterns of contestation are shaped by shifting political relationships between the nation and the city. We conclude that Tilly’s theoretical frame is nicely sustained by the comparative analysis of cases very different from those that stimulated his original formulations.  相似文献   
243.
Due to the growth of the video game industry, the practice of in-game advertising, and the desirable game player demographics, then U.S. Presidential candidate Barack Obama placed early voting advertisements in a series of online sport video games during his 2008 presidential campaign. The purpose of this study was to examine the awareness of these political ads and the attitudes towards the ads when compared to advertisements featuring corporate brands. The results suggest there were higher levels of awareness for the political themed advertisements while attitude enhancement was more likely to occur for advertisements which featured corporate brands.  相似文献   
244.
245.
246.
Empirical studies have delivered mixed conclusions on whether the widely acclaimed assertions of lower electronic retail (e‐tail) prices are true and to what extent these prices impact conventional retail prices, profits, and consumer welfare. For goods that require little in‐person pre‐ or postsales support such as CDs, DVDs, and books, we extend Balasubramanian's e‐tailer‐in‐the‐center, spatial, circular market model to examine the impact of a multichannel e‐tailer's presence on retailers' decisions to relocate, on retail prices and profits, and consumer welfare. We demonstrate several counter‐intuitive results. For example, when the disutility of buying online and shipping costs are relatively low, retailers are better off by not relocating in response to an e‐tailer's entry into the retail channel. In addition, such an entry—a multichannel strategy—may lead to increased retail prices and increased profits across the industry. Finally, consumers can be better off with less channel competition. The underlying message is that inferences regarding prices, profits, and consumer welfare critically depend on specifications of the good, disutility and shipping costs versus transportation costs (or more generally, positioning), and competition.  相似文献   
247.
248.
This multi-site examination of sexual abuse histories of youth in residential treatment centers asked, for the sample as a whole and by youth's gender: (a) How many perpetrators did each youth have? (b) What was the gender of the perpetrator? (c) What proportion of youth was abused by family members? (d) What proportion of youth was abused in a child welfare setting? And, (e) what proportion of sexually abused youth were also victims of physical abuse and/or neglect? Results revealed that males were more likely to have one perpetrator, a female perpetrator, and to have been abused in a child welfare setting and less likely be abused by a family member. Implications for refining programs and practices are discussed.  相似文献   
249.
While more and more firms have implemented e‐business in business operations, a better understanding of the factors that successfully drive the assimilation of e‐business will provide insights for firm executives and practitioners to develop effective strategies for e‐business. Different from previous studies that focus on individual‐level factors related to business executives and top management teams, this study examines how firm‐level strategic and cultural factors shape e‐business assimilation. Based on the strategy and marketing literature on market orientation and firm ownership, we developed a research model to describe how a firm's market orientation impacts e‐business assimilation. The model also describes the moderating effect of firm ownership type on the relationship between market orientation and e‐business assimilation. Based on data from 301 Chinese international trade firms, we found that two dimensions of market orientation (i.e., customer orientation, competitor orientation) had significant effects on e‐business assimilation. However, the third dimension, interfunctional coordination, was only partially significant. In addition, ownership type was a significant moderator of the effects of customer orientation and competitor orientation on e‐business assimilation, although ownership type was not a moderator of interfunctional coordination. Being one of the first studies of the impact of market orientation and firm ownership type on e‐business assimilation, we conclude with a discussion of the implications for future research and practice.  相似文献   
250.
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