全文获取类型
收费全文 | 8406篇 |
免费 | 157篇 |
专业分类
管理学 | 1197篇 |
民族学 | 35篇 |
人才学 | 1篇 |
人口学 | 749篇 |
丛书文集 | 34篇 |
理论方法论 | 770篇 |
综合类 | 286篇 |
社会学 | 3638篇 |
统计学 | 1853篇 |
出版年
2023年 | 45篇 |
2021年 | 58篇 |
2020年 | 111篇 |
2019年 | 163篇 |
2018年 | 195篇 |
2017年 | 276篇 |
2016年 | 232篇 |
2015年 | 175篇 |
2014年 | 195篇 |
2013年 | 1439篇 |
2012年 | 315篇 |
2011年 | 245篇 |
2010年 | 189篇 |
2009年 | 172篇 |
2008年 | 214篇 |
2007年 | 197篇 |
2006年 | 148篇 |
2005年 | 207篇 |
2004年 | 183篇 |
2003年 | 222篇 |
2002年 | 241篇 |
2001年 | 222篇 |
2000年 | 194篇 |
1999年 | 189篇 |
1998年 | 144篇 |
1997年 | 115篇 |
1996年 | 131篇 |
1995年 | 107篇 |
1994年 | 102篇 |
1993年 | 109篇 |
1992年 | 128篇 |
1991年 | 119篇 |
1990年 | 115篇 |
1989年 | 104篇 |
1988年 | 112篇 |
1987年 | 112篇 |
1986年 | 105篇 |
1985年 | 121篇 |
1984年 | 99篇 |
1983年 | 106篇 |
1982年 | 75篇 |
1981年 | 77篇 |
1980年 | 73篇 |
1979年 | 74篇 |
1978年 | 78篇 |
1977年 | 56篇 |
1976年 | 45篇 |
1975年 | 59篇 |
1974年 | 49篇 |
1973年 | 42篇 |
排序方式: 共有8563条查询结果,搜索用时 15 毫秒
231.
Urbanization is a process that heavily alters marine and terrestrial environments, though terrestrial urban ecosystems have been studied far more intensively. Terrestrial studies suggest that urbanization can facilitate mesopredators by enhancing food and shelter resources and reducing predation pressure from apex consumers. This in turn has considerable consequences for ecological communities. We evaluated spatial distribution patterns and habitat-use of the marine mesopredator, giant Pacific octopus (Enteroctopus dofleini), relative to terrestrial urbanization intensity in Puget Sound, Washington, USA. Using field surveys and citizen-contributed data for E. dofleini, we examined whether: (1) Distribution was related to urbanization, (2) Abundance was related to the extent of benthic anthropogenic debris, and (3) Diet differed as a function of urbanization and den cover. Our results suggest that urbanization impacts may differ with depth. Mixed-effects logistic regression model estimates for the probability of occurrence increased with urbanization in deep-water (> 24 m), and decreased with urbanization in shallow water (< 18 m). Accompanying field surveys indicated that E. dofleini abundance was correlated with the number of benthic anthropogenic debris items, and that E. dofleini diets were not affected by urbanization intensity or den cover. Though E. dofleini may be synanthropic within certain urban environments, the mechanisms driving this pattern likely differ from those affecting common urban mesopredators on land, with den provisioning from man-made structures being more important than altered food resources. 相似文献
232.
David T. Kryszajtys Tara E. Hahmann Andrée Schuler Sarah Hamilton-Wright Carolyn P. Ziegler Flora I. Matheson 《Journal of gambling studies / co-sponsored by the National Council on Problem Gambling and Institute for the Study of Gambling and Commercial Gaming》2018,34(3):893-914
Despite many studies indicating an association between problem gambling and delinquent behaviours among adolescents, there has been no effort to systematically analyze the state of the literature on this relationship. To fill this gap, we conducted a scoping review of the literature published between 2000 and 2016 on problem gambling and delinquent behaviours among adolescents. We searched twelve databases and reviewed reference lists to identify eligible studies. Search terms included a combination of medical subject headings and keywords for gambling, youth, and delinquency, which were combined with the Boolean operator “AND”. 1795 studies were identified through the literature search. Nine studies were eligible for inclusion. All of the studies were conducted in North America, with primarily male participants, and most of the data were cross-sectional. No qualitative studies met the inclusion criteria. Screening tools used to measure problem gambling were inconsistent, making comparisons across studies difficult. We found a consistent moderate to strong association between problem gambling and delinquent behaviour. Only one study presented associations by socio-economic status and none considered gender, sex or ethnic differences. Studies in the review showed that problem gambling is associated with both violent and non-violent behaviours among adolescents. These associations may suggest that problem gambling and delinquent behaviours have common risk factors and reflect a syndrome of risky behaviours best targeted through prevention and treatment that is holistic and considers the context in which the youth is situated. Further research is warranted to better understand the relationship between problem gambling and delinquent behaviours. 相似文献
233.
234.
Pétremand Gaël Chittaro Yannick Braaker Sonja Brenneisen Stephan Gerner Magdalena Obrist Martin K. Rochefort Sophie Szallies Alexander Moretti Marco 《Urban Ecosystems》2018,21(1):119-132
Urban Ecosystems - Green roofs have recently gained recognition for their potential contribution to urban ecosystems by providing, among other services, habitat for plants and animals, and stepping... 相似文献
235.
ABSTRACTDespite both scholarly and popular claims that citizen journalism (CJ) represents a growing democratizing force in the journalistic field, recent scholarship in the area has noted the decline of the organizational population of CJ. In this paper, we investigate how individual characteristics of sites and the dynamics of larger organizational population affect a CJ site’s risk of experiencing a mortality. Drawing on the largest sample to date of US-based English-language CJ sites, this study examines the risk of site mortality through an event history framework. Findings indicate that the strongest predictor of a site’s mortality is the age of the site, consistent with organizational population theory’s ‘liability of newness.’ We also find that for-profit and community-based sites have lower rates of site mortality, indicating that adopting legitimate conventions of journalism may serve as a protective buffer to site death. The results offer mixed evidence on whether CJ has become more professionalized via attrition. 相似文献
236.
Xiaoyan Lei Yan Shen James P. Smith Guangsu Zhou 《Review of Economics of the Household》2018,16(1):75-95
This research uses nationally representative data to study how economic resources and inequalities are associated with life satisfaction of Chinese residents. We construct economic resource and inequality measures from expenditure rather than from income, after confirming that expenditure inequality is a better measure in the Chinese context. We find that economic inequalities in general are negatively associated with life satisfaction, and that this association is larger for inequalities in the lower half of the distribution than those in the upper half of the distribution. We further explore the mechanisms under which inequality can be associated with life satisfaction, and find that aspiration is potentially one important channel. 相似文献
237.
In this article, we introduce a class of tests, using a martingale approach, for testing independence of failure time and cause of failure for competing risks data. Asymptotic distribution of the proposed test statistic is derived. The procedure is illustrated with a real-life data. A simulation study is carried out to assess the level and power of the test. 相似文献
238.
Insha Ullah Matthew D.M. Pawley Adam N.H. Smith Beatrix Jones 《Australian & New Zealand Journal of Statistics》2017,59(4):449-462
Multivariate control charts are used to monitor stochastic processes for changes and unusual observations. Hotelling's T2 statistic is calculated for each new observation and an out‐of‐control signal is issued if it goes beyond the control limits. However, this classical approach becomes unreliable as the number of variables p approaches the number of observations n, and impossible when p exceeds n. In this paper, we devise an improvement to the monitoring procedure in high‐dimensional settings. We regularise the covariance matrix to estimate the baseline parameter and incorporate a leave‐one‐out re‐sampling approach to estimate the empirical distribution of future observations. An extensive simulation study demonstrates that the new method outperforms the classical Hotelling T2 approach in power, and maintains appropriate false positive rates. We demonstrate the utility of the method using a set of quality control samples collected to monitor a gas chromatography–mass spectrometry apparatus over a period of 67 days. 相似文献
239.
240.