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   6405篇
  免费   49篇
  国内免费   1篇
管理学   242篇
民族学   89篇
人才学   14篇
人口学   332篇
丛书文集   244篇
理论方法论   3227篇
综合类   816篇
社会学   1303篇
统计学   188篇
  2023年   5篇
  2022年   7篇
  2021年   8篇
  2020年   10篇
  2019年   24篇
  2018年   16篇
  2017年   22篇
  2016年   16篇
  2015年   26篇
  2014年   87篇
  2013年   34篇
  2012年   361篇
  2011年   249篇
  2010年   140篇
  2009年   86篇
  2008年   194篇
  2007年   246篇
  2006年   211篇
  2005年   204篇
  2004年   167篇
  2003年   128篇
  2002年   155篇
  2001年   175篇
  2000年   149篇
  1999年   71篇
  1998年   55篇
  1997年   37篇
  1996年   41篇
  1995年   46篇
  1994年   43篇
  1993年   192篇
  1992年   213篇
  1991年   287篇
  1990年   103篇
  1989年   212篇
  1988年   200篇
  1987年   208篇
  1986年   229篇
  1985年   263篇
  1984年   265篇
  1983年   254篇
  1982年   313篇
  1981年   344篇
  1980年   227篇
  1979年   44篇
  1978年   19篇
  1977年   9篇
  1967年   6篇
  1959年   8篇
  1957年   6篇
排序方式: 共有6455条查询结果,搜索用时 15 毫秒
171.
The Physical Activity Questionnaire for Elderly Japanese (PAQ-EJ) is a self-administered physical activity questionnaire for elderly Japanese; the authors report here on its repeatability and direct and indirect validity. Reliability was assessed by repeat administration after 1 month. Direct validation was based on accelerometer data collected every 4 s for 1 month in 147 individuals age 65-85 years. Indirect validation against a 10-item Barthel index (activities of daily living [ADL]) was completed in 3,084 individuals age 65-99 years. The test-retest coefficient was high (r = .64-.71). Total and subtotal scores for lower (transportation, housework, and labor) and higher intensity activities (exercise/sports) were significantly correlated with step counts and durations of physical activity <3 and >or=3 METs (r = .41, .28, .53), respectively. Controlling for age and ADL, scores for transportation, exercise/sports, and labor were greater in men, but women performed more housework. Sex- and ADL- or age-adjusted PAQ-EJ scores were significantly lower in older and dependent people. PAQ-EJ repeatability and validity seem comparable to those of instruments used in Western epidemiological studies.  相似文献   
172.
Demographic studies indicate a remarkable aging trend in North America. An accurate profile of the decline in physical and cognitive capabilities over time is essential to our understanding of the aging process. This study examined the maintenance of skilled performance across the careers of 96 professional golfers. Data were collected on scoring average, driving distance, driving accuracy, greens in regulation, putts per round, and number of competitive rounds played using online data archives. Analyses indicate that performance in this activity can be maintained to a greater extent than in activities relying on biologically constrained abilities. Although the generalizability of these results to "normal" aging populations is not known, they suggest that acquired skills can be maintained to a large extent in the face of advancing age.  相似文献   
173.
174.
175.
176.
Prolapse is an extremely common condition, for which 11% of women will have a surgical procedure at some point in their lives. The recurrence rate after most of the traditional surgical procedures is high and upto 29% of women who have had surgery for prolapse will require a further operation. In order to improve the surgical outcome, there is currently much interest in the use of grafts to augment traditional repairs and new procedures have been developed using specifically developed grafts. These have been combined with minimally invasive surgical techniques in an attempt to reduce surgical morbidity. These procedures may improve the outcome of surgery for prolapse. However, there is currently a lack of long-term data from randomized trials to demonstrate their effectiveness and safety.  相似文献   
177.
The Collegiate Learning Assessment: facts and fantasies   总被引:4,自引:0,他引:4  
The Collegiate Learning Assessment (CLA) is a computer administered, open-ended (as opposed to multiple-choice) test of analytic reasoning, critical thinking, problem solving, and written communication skills. Because the CLA has been endorsed by several national higher education commissions, it has come under intense scrutiny by faculty members, college administrators, testing experts, legislators, and others. This article describes the CLA's measures and what they do and do not assess, how dependably they measure what they claim to measure, and how CLA scores differ from those on other direct and indirect measures of college student learning. For instance, analyses are conducted at the school rather than the student level and results are adjusted for input to assess whether the progress students are making at their school is better or worse than what would be expected given the progress of "similarly situated" students (in terms of incoming ability) at other colleges.  相似文献   
178.
This paper examines factors associated with feeling suicidal in a large sample of urban men in Sydney and Melbourne, aged 18-50, including heterosexual, gay and bisexual men, HIV antibody positive and HIV antibody negative. As in previous research, sexuality (being homosexual or bisexual) was found to be a major predictor of suicidality. The research went some way towards explaining the close relationship between feeling suicidal and sexual orientation. Sexuality interacts with feeling bad in that, once men feel moderately bad/depressed, they are more likely to feel suicidal if they are homosexual or bisexual than if they are heterosexual. In addition, the research found that experience of verbal abuse and physical assault (harassment) increased feeling suicidal for both heterosexual and gay/bisexual men, not just for homosexual men as suggested by previous research, and that social isolation in the form of living alone is a further risk factor. Seeking counseling help and taking sexual risks were also independently associated with feeling suicidal. These actions may result from feeling suicidal rather than the reverse, and their association with feeling suicidal warrants further research. Many of the 46 independent variables examined in the research, including HIV antibody status and closeness to the HIV/ AIDS epidemic, were related to feeling suicidal only through their association with being gay/bisexual. Celibacy and general risk taking were not related to feeling suicidal in this study.  相似文献   
179.
180.
The belief that sadomasochism (SM) is violence or abusive behavior has resulted in harassment, physical attacks, and discrimination against SM-identified individuals. Historically, they were often opposed by self-identified feminists. One reason the women who practiced SM were targeted was the official opposition to sadomasochistic practices promulgated by the National Organization for Women (NOW). Current statistics of incidents of discrimination, harassment and physical attacks against SM-identified individuals and SM groups are compiled by the National Coalition for Sexual Freedom (NCSF).  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