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   126篇
  免费   5篇
各国政治   5篇
工人农民   10篇
世界政治   26篇
外交国际关系   5篇
法律   54篇
中国政治   2篇
政治理论   29篇
  2020年   1篇
  2019年   5篇
  2018年   2篇
  2017年   1篇
  2016年   5篇
  2015年   6篇
  2014年   3篇
  2013年   14篇
  2012年   2篇
  2011年   2篇
  2009年   3篇
  2008年   3篇
  2007年   5篇
  2006年   6篇
  2005年   4篇
  2004年   3篇
  2003年   1篇
  2002年   6篇
  2001年   2篇
  2000年   5篇
  1999年   3篇
  1998年   1篇
  1997年   1篇
  1996年   4篇
  1995年   3篇
  1994年   4篇
  1993年   3篇
  1992年   7篇
  1991年   4篇
  1989年   1篇
  1988年   1篇
  1987年   2篇
  1985年   2篇
  1984年   2篇
  1982年   1篇
  1981年   1篇
  1980年   2篇
  1979年   1篇
  1978年   3篇
  1976年   1篇
  1975年   1篇
  1974年   1篇
  1970年   1篇
  1968年   1篇
  1967年   1篇
排序方式: 共有131条查询结果,搜索用时 31 毫秒
121.
In this paper we explore to what extent county murder and nonnegligentmanslaughter rates in the midsouth are spatially autocorrelated, usinga variety of spatial autocorrelation tests. The data are 3-year averages ofUCR murder and nonnegligent manslaughter rates from the 383 midsouthcounties. Moran's I statistics show a statistically significant amountof spatial autocorrelation in the murder and nonnegligent manslaughter ratesamong the 383 midsouth counties. G statistics, however, fail to detect aglobal pattern in this region. We also compute G i statistics and localMoran's I statistics with these data and detect some patterns oflocalized spatial autocorrelation. We estimated and compared an MLE spatiallag model and an OLS model with constructs informed by socialdisorganization theory. The regression analysis failed to detect anysignificant spatial effects for the midsouth counties.  相似文献   
122.
123.
Man's relationship to the natural environment and nature's influence upon human life are among the oldest topics of speculation. Until modern times the major reason for concern was the prospect of diminishing returns. It was thought that population and economic growth would press against natural resource limits, and that economic welfare would fall to subsistence levels.In modern times in developed nations the prospect of diminishing returns has been avoided. Population increase has abated to rates which promise stability in population numbers. Technology, capital accumulation, and improvements in labor force have yielded increasing returns. Per capita output grows at 2 or 3 % per year.The modern concern is quality of environment and quality of life. The technology, industrialization and agglomeration which have yielded increasing returns of goods per capita have side effects. These are pollution and crowding, increased needs for public goods, expanded monopoly in the market places, and dilemmas of choice from affluence. The task for modern societies is to bend their enlarged technology and productive power to improving quality of environment and, more generally, quality of life.Presented at the Man and Land Symposium on Economic Growth and the Quality of Life, College of Liberal Arts, Oregon State University, Corvallis, Oregon, May 10, 1973.  相似文献   
124.
In recent years capital spending in the health care industry has escalated tremendously, and most forecasters agree that needs will increase at an even faster rate throughout the 1990s. As a result of this trend, there is a dire need to develop effective and equitable controls on capital spending in health care. One of the capital payment options under consideration is the establishment of a lid on capital expenditures and the concomitant allocation of capital to health care providers whose applications are the most meritorious. The purpose of this article is to present some ideas and methods for the development of a relative need system to accompany a capital expenditure limit and to supplement and expand the absolute need determinations of the typical CON process.  相似文献   
125.
The primary aim of this study was to investigate the association between measured blood alcohol concentration (BAC) and the presence and degree of amnesia (no amnesia, grayout, or blackout) in actively drinking subjects. A secondary aim was to determine potential factors other than BAC that contribute to the alcohol-induced memory loss. An interview questionnaire was administered to subjects regarding a recent alcohol associated arrest with a documented BAC greater than 0.08 g/dL for either public intoxication, driving under the influence, or under age drinking was administered. Demographic variables collected included drinking history, family history of alcoholism, presence of previous alcohol-related memory loss during a drinking episode, and drinking behavior during the episode. Memory of the drinking episode was evaluated to determine if either an alcohol-induced grayout (partial anterograde amnesia) or blackout (complete anterograde amnesia) occurred. Differences in (1) mean total number of drinks ingested before arrest, (2) gulping of drinks, and (3) BAC at arrest were found for those having blackouts compared with no amnesia; while differences in drinking more than planned were found between the no amnesia and grayout groups. A strong linear relationship between BAC and predicted probability of memory loss, particularly for blackouts was obvious. This finding clinically concludes that subjects with BAC of 310 g/dL or greater have a 0.50 or greater probability of having an alcoholic blackout.  相似文献   
126.
A rapid method for screening drug seizure samples for 3,6-diacetylmorphine (heroin), which consists of a simple hydrolysis procedure and flow-injection analysis with two chemiluminescence reagents, is described. Before hydrolysis, 3,6-diacetylmorphine evokes an intense response with a tris(2,2'-bipyridyl)ruthenium(III) reagent (prepared by dissolving the perchlorate salt in acetonitrile), and a relatively weak chemiluminescence response with a second reagent: potassium permanganate in an aqueous acidic polyphosphate solution. However, the permanganate reagent is extremely sensitive toward the hydrolysis products of 3,6-diacetylmorphine (i.e., 6-monoacetylmorphine and morphine). Some compounds commonly found in drug laboratories may cause false positives with tris(2,2'-bipyridyl)ruthenium(III), but do not produce the markedly increased response with the permanganate reagent after the hydrolysis procedure. The combination of these two tests therefore provides an effective presumptive test for the presence of 3,6-diacetylmorphine, which we have verified with 14 samples obtained from a forensic science laboratory.  相似文献   
127.
128.
Environmentally dangerous but profitable hazardous waste disposal is an instance of market failure. Tort law has failed as a social mechanism to sanction powerful corporations for such crimes against the environment. The federal Superfund hazardous waste cleanup program, a regulatory system created to fill this void, is also marked by failure. This article makes the case that the inability to resolve Superfund-engendered distributional conflicts has precluded the efficient and equitable outcomes that characterize a socially beneficial market, tort, or regulatory response. A political economy of regulation that links conflict, conflict resolution, and Superfund failure is examined.  相似文献   
129.
130.
Researchers have found mixed support for documenting whether work is protective or harmful during adolescence. This study examined the association between work and problem behaviors among African American youth (N = 592; 53% female; = 14.8 years, SD = .60) followed from mid-adolescence to young adulthood over eight Waves (90% response rate over the first four Waves and a 68% response rate across all eight Waves). We explored three competing operationalizations of work: work history (never worked, worked), work intensity (no work, 20 h or less, and 21 h or over), and work trajectories (never worked, episodic work, stopped working, late starter, and consistent worker). Non-working youth reported higher marijuana use during young adulthood than their working counterparts. Nonworkers reported lower self-acceptance during young adulthood than those working greater number of hours per week. Differences in work trajectories for cigarette use, depression, and anxiety during adolescence imply that when and for how long youth work are also important factors to explore. Our findings lend tentative support to the work benefits perspective and suggest that the association between work and problem behaviors may depend on the work measure used. We discuss the implications of employing different work measures in adolescent research.
Cleopatra Howard CaldwellEmail:
  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