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   9795篇
  免费   70篇
财政金融   1900篇
工业经济   682篇
计划管理   1810篇
经济学   1880篇
综合类   121篇
运输经济   65篇
旅游经济   113篇
贸易经济   1602篇
农业经济   480篇
经济概况   1209篇
邮电经济   3篇
  2021年   56篇
  2020年   120篇
  2019年   147篇
  2018年   227篇
  2017年   230篇
  2016年   227篇
  2015年   134篇
  2014年   227篇
  2013年   1036篇
  2012年   304篇
  2011年   303篇
  2010年   294篇
  2009年   336篇
  2008年   321篇
  2007年   311篇
  2006年   285篇
  2005年   210篇
  2004年   231篇
  2003年   230篇
  2002年   244篇
  2001年   189篇
  2000年   193篇
  1999年   192篇
  1998年   179篇
  1997年   149篇
  1996年   168篇
  1995年   145篇
  1994年   146篇
  1993年   143篇
  1992年   144篇
  1991年   137篇
  1990年   133篇
  1989年   97篇
  1988年   106篇
  1987年   109篇
  1986年   119篇
  1985年   161篇
  1984年   151篇
  1983年   134篇
  1982年   124篇
  1981年   125篇
  1980年   124篇
  1979年   105篇
  1978年   124篇
  1977年   140篇
  1976年   91篇
  1975年   85篇
  1974年   77篇
  1973年   59篇
  1971年   46篇
排序方式: 共有9865条查询结果,搜索用时 15 毫秒
31.
32.
Priorities for prevention activities and planning for services depend on comprehensive knowledge of the distribution of the injury-related burden in the community. The aim of this systematic review was to quantify the effect of being injured, compared with not being injured, on long-term mortality in working age adults. Cohort studies were selected that were population-based, measured mortality post-discharge from inpatient treatment, included a non-injured comparison group and related to working-age adults. Data synthesis was in tabular and text form with a meta-analysis not being possible because of the heterogeneity between studies. Eleven studies met the inclusion criteria. All studies found an overall positive association between injury and increased mortality. While the greatest excess mortality was evident during the initial period post-injury, increased mortality was shown in some studies to persist for up to 40 years after injury. Due to the limited number of injury types studied and heterogeneity between studies, there is insufficient published evidence on which to calculate population estimates of long-term mortality, where injury is a component cause. The review does suggest there is considerable excess mortality following injury that is not accounted for in current methods of quantifying injury burden, and is not used to assess quality and effectiveness of trauma care.  相似文献   
33.
34.
Burning bluegrass seed stubble is an important production practice that, among other benefits, increases production and stand life of this perennial crop. Despite economic forecasts that higher production costs from the 1996 state ban on seed stubble burning would reduce Washington production by up to 30%, output in the years 1998–2005 was nearly two-thirds higher than in any previous eight-year period. This study seeks to explain why that paradoxical behavior occurred. This study puts forward and systematically tests several hypotheses. The only hypothesis with any support, innovation offsets, is examined by an assessment of contemporaneous innovations and by corroborative statistical evidence.  相似文献   
35.
36.
This paper applies a novel empirical approach to characterising the horizontal‐ness and vertical‐ness of affiliates based on Yeaple's complex FDI concept. In its simplest form, horizontal‐ness is measured as affiliates’ local sales share while their vertical‐ness is measures as their share of non‐local sourcing of intermediates. Japanese affiliates in most sectors and nations are partly vertical and partly horizontal, but those in North American are far more ‘horizontal’ than those in the EU and Asia. Affiliates became more vertical between 1996 and 2005. A four‐way sales and sourcing split (host, home, regional and RoW) suggests that affiliates act as nodes in regional production networks – especially in Asia. We posit several hypotheses that could be tested with our empirical approach.  相似文献   
37.
This paper explores how individual characteristics of age, need for cognition (NFC), and affective intensity (AI) interact with each other and with advertising appeal frames (i.e., rational, positive-emotional, negative-emotional) to influence ad attitudes, involvement, and recall. The mixed design study reveals that younger adults recall emotional messages, especially negative ones, better than rational ones, but recall does not differ for older adults across appeal frames. Older adults prefer rational and positive messages to negative-emotional messages but ad attitudes do not differ among younger adults across appeal frames. Finally, age interacts with AI, but not NFC, to influence ad responsiveness. Both age and AI influence ad attitudes such that older adults exhibit the most positive ad attitudes across all appeal frames.  相似文献   
38.
39.
The relationship between sources of income and demand decisions by the household is examined here with an eye toward the ramifications on consumption tax bases. Income sources may be important when households attach psychic and transaction costs to individual purchases or when sources are assigned via a mental accounting process. In either case, general and specific sales tax bases may be affected by changes in income composition. Empirical results indicate two important findings. First, tax exemptions can introduce significant income source effects for a general consumption tax base. Second, the importance of differential tax rates for gasoline and food-at-home strongly depends on the mix of labour, capital, retirement and non-retirement transfer pay.  相似文献   
40.
How should social scientists, inclined to an evolutionary theory of aspects of human culture like science, technology, business organization and practice, react to proposals that they embrace a “Universal Darwinism”? The most prominent variety of Universal Darwinism argues for close counterparts between the variables and mechanisms of cultural evolution and biological evolution, for example proposing the concept of “memes” as units of culture. Other Universal Darwinists propose, more flexibly, that human culture and biological species both change over time through a process that involves variation and selection, but that the details of the processes may be very different. This essay argues that the narrower form of Universal Darwinism should not be acceptable to social scientists. The differences in the details of cultural evolution and biological evolution are considerable. On the other hand, if Universal Darwinism provides a roomy intellectual tent welcoming scholars studying a variety of topics, with the unifying element being a dynamic theory involving variation and selection, but with the key variables and mechanisms being recognized as perhaps differing greatly between biology and human culture, we can be happy in that camp. Evolutionary Social Science and Universal Darwinism.  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