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   5543篇
  免费   113篇
管理学   706篇
民族学   26篇
人口学   563篇
丛书文集   21篇
教育普及   1篇
理论方法论   546篇
综合类   62篇
社会学   2611篇
统计学   1120篇
  2023年   35篇
  2021年   51篇
  2020年   97篇
  2019年   130篇
  2018年   141篇
  2017年   205篇
  2016年   147篇
  2015年   89篇
  2014年   142篇
  2013年   859篇
  2012年   171篇
  2011年   156篇
  2010年   135篇
  2009年   118篇
  2008年   152篇
  2007年   138篇
  2006年   154篇
  2005年   134篇
  2004年   127篇
  2003年   88篇
  2002年   112篇
  2001年   137篇
  2000年   131篇
  1999年   140篇
  1998年   105篇
  1997年   94篇
  1996年   94篇
  1995年   70篇
  1994年   62篇
  1993年   90篇
  1992年   94篇
  1991年   99篇
  1990年   82篇
  1989年   84篇
  1988年   65篇
  1987年   76篇
  1986年   64篇
  1985年   79篇
  1984年   74篇
  1983年   74篇
  1982年   49篇
  1981年   45篇
  1980年   39篇
  1979年   51篇
  1978年   40篇
  1977年   33篇
  1976年   35篇
  1975年   32篇
  1974年   42篇
  1973年   31篇
排序方式: 共有5656条查询结果,搜索用时 31 毫秒
991.
This article examines Q methodology as an empirical method for use in social work research. Q methodology applies statistical analysis to the qualitative study of human subjectivity such as attitudes, beliefs, feelings and opinions. Q methodology is effective for obtaining data from small samples, and it offers respondents a concise and valid way of expressing their viewpoints with minimal researcher interference. The article provides an overview of Q methodology and presents an actual example of a small‐scale Q study to facilitate a better understanding of the method. We conclude that Q methodology is especially suitable in social work research with respondents who may have difficulties in expressing themselves when more conventional research methods are used. Q methodology is an efficient tool in research involving the exploration and comparison of different points of view.  相似文献   
992.
Measurement of bone turnover markers has been proposed as a potentially valuable clinical laboratory aid in osteoporosis risk assessment. These markers may allow quantitative evaluation of rates of bone loss, and thereby identify persons at risk for osteoporosis at an earlier stage. As far as we know, this is the longest longitudinal study on bone turnover markers conducted in adult men. The objectives of this study were to determine whether markers of bone formation (type I procollagen amino-terminal propeptide, PINP, and carboxy-terminal propeptide, PICP), and of bone resorption (type I collagen carboxy-terminal telopeptide, ICTP), are predictive of changes in lumbar spine and femoral neck BMD over a 5-year period, and to determine the ability of the bone resorption marker urine amino-terminal telopeptide (NTx) to explain the variance in BMD change over the past 5 years in a group of men 35–69 years old. In this group, NTx was the only marker to correlate significantly with BMD changes at the femoral neck (r = ?0.21), but not at the spine. The use of the biochemical markers studied to predict change in bone density in adult men in middle-aged years is of very limited value.  相似文献   
993.
Objective. We examined age associated variation in salivary testosterone values among Japanese males as well as anthropometric measurements.

Methods. Salivary samples were collected in pretreated sodium azide treated tubes. The first series: 15–79-year-old males (n = 99); two morning and two evening samples were collected at home for two days. The second series: 90-year-old males (n = 29); one morning sample was collected. Testosterone values were determined using an iodine125-based radioimmunoassay kit modified for saliva.

Results. Results show 1) a significant decrease in salivary testosterone values from 20s to 40s and older, 2) no significant decline after 40 through 90 years old, 3) no significant age-related differences in the degree of intraindividual diurnal fluctuation across age groups of 40–70s, and 4) higher BMI is associated with the lower salivary testosterone among 40–70s.

Conclusions. These results suggest that neither a constant decrease of salivary testosterone values or markedly reduced intraindividual fluctations are universal aspects of aging. Older males may maintain relatively high testosterone levels compared to younger men and a relatively ‘robust’ neuroendocrinological system.  相似文献   
994.
T Ebert 《The aging male》2013,16(4):304-311
Due to a decrease in Leydig cell function, a considerable proportion of men over 50 years of age will develop hypogonadism. Consequently, loss of libido and several other testosterone-dependent symptoms may become evident. When decreased levels of biologically available testosterone are found, and corresponding symptoms are present, these men could be eligible for testosterone substitution therapy. Testosterone treatment in testosterone-deprived men has been shown to improve general well-being, osteoporosis, muscle atrophy, libido and - if present - anemia. Despite these positive effects, testosterone treatment has to be performed with caution. Although it has not been proven that elevation of the serum testosterone level to the normal range results in a greater risk of developing prostate cancer, the effects of testosterone on a prostate cancer already present are well established. Several studies have demonstrated that testosterone treatment does not result in a significant increase in serum levels of prostate-specific antigen (PSA) or prostate volume. The long-term effects, however, are currently unknown. For these reasons, testosterone treatment should be performed only when the presence of prostate cancer is unlikely; i.e. when PSA levels are within normal limits and digital rectal examination does not reveal any suspicious findings. These examinations may still miss some small prostate cancers that could be promoted by testosterone treatment. The determination of PSA levels under testosterone treatment is necessary every 3 months, at least for the first year. Steadily rising PSA levels require immediate cessation of testosterone administration and the initiation of further diagnostic procedures (prostate biopsy), to rule out prostate cancer.  相似文献   
995.
The current study assessed the utility of a responsible gambling (RG) tool that provides players with behavioural feedback about their gambling. Data was obtained from 779 people (n = 694 male; n = 85 female) who gambled online with Svenska Spel (the Swedish gambling operator) and who opted to receive behavioural feedback via an RG tool (Playscan). Importantly, data was also obtained from a matched sample of 779 players who did not opt to receive behavioural feedback. Feedback took the form of a colour-coded risk rating (Green = no issues, Yellow = at-risk, Red = problematic), which was determined by a proprietary algorithm. Additionally, gambling expenditure data (amounts deposited and wagered) was gathered for the week in which players enrolled to use the RG tool, the subsequent week and 24 weeks later (this data was also gathered for the matched sample). Results showed that Yellow (i.e. at-risk) players who used the tool significantly reduced the amounts of money deposited and wagered compared to players who did not use the tool – an effect observed the week following enrolment as well as 24 weeks later. Thus, informing at-risk players who have opted to receive feedback about their gambling appears to have a positive impact on subsequent expenditures.  相似文献   
996.
This article addresses the issue of industry-funded research and specifically responds to the critique that such research necessarily involves a conflict of interests. It also offers four areas that need attention in order to improve transparency in gambling-related research.  相似文献   
997.
This article examines the liminal space of the desert borderlands as a scene of routinized sexualized and gendered violence against migrant women border crossers. We explore the human consequences of a philosophy of attrition that is the cornerstone of the US immigration system. Using border sexual conquest and the coloniality of power as lenses, we examine how global neoliberalism represents a form of contemporary conquest that normalizes sexual and gendered violence at transnational locations.  相似文献   
998.
The Arab spring was quickly chilled in the Gulf states where monarchies proved more resilient in the face of political challenges than post-revolutionary states in North Africa and the fertile crescent. Money explains some of this resilience but so does the willingness to use the aegis of the Gulf Cooperation Council to apply deadly force against unarmed protestors in Bahrain, where severe repression of the Shiite majority continues and casts its shadow over the hopes of dissenters, young and older, for political opening in these authoritarian states.

La primavera árabe se enfrió rápidamente en los estados del golfo en donde las monarquías demostraron mayor resistencia frente a los retos políticos que los estados posrevolucionarios en África del norte y el arco fértil. El dinero explica algo sobre esta resistencia, pero también la disposición de usar el auspicio del Consejo de Cooperación del Golfo, para aplicar una fuerza mortal contra los manifestantes desarmados en Bahrein, en donde una represión severa de la mayoría chiíta continúa y proyecta una sombra sobre las esperanzas de los disidentes jóvenes y mayores, para la apertura política en estos estados autoritarios.

“阿拉伯之春”在海湾国家很快就冷却了,那里的君主政体证明比北非和新月沃地一带的后革命国家适应能力更强。在巴林,可以部分解释这种适应能力的除了财富,还有在海湾合作委员会庇护下对手无寸铁的抗议者使用致命武器的意志,在那里什叶派多数的严厉镇压在持续,并给广大反对者们对威权国家政治开放怀有的希望投下了阴影。  相似文献   
999.
1000.
This study investigated the impact of union history and marital transitions on wealth inequality between older Black and White women (N = 7,026). Cohort data from the Health and Retirement Study show large and increasing Black – White differences in wealth. Marital and relationship histories are associated with the wealth accumulation process among older women. Women who married and stay married accumulated levels of wealth that exceeded those of other women with disrupted family lives. The marriage – wealth nexus is sensitive to a woman's position in the wealth distribution. Quantile regression results revealed that racial differences in total wealth holdings between Black and White women exist throughout the wealth distribution, whereas the relationship between current union history and wealth differentials is significant at the lower tail and middle of the distribution. Decomposition analyses highlighted the nontrivial role of racial disparities in marital histories in accounting for the racial wealth gap. As members of the baby boom generation enter their retirement years, it will be more important than ever to monitor the wealth accumulation process among older single and racial/ethnic minority women.  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