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   5085篇
  免费   153篇
财政金融   941篇
工业经济   435篇
计划管理   943篇
经济学   1094篇
综合类   48篇
运输经济   44篇
旅游经济   100篇
贸易经济   894篇
农业经济   209篇
经济概况   525篇
信息产业经济   1篇
邮电经济   4篇
  2023年   26篇
  2021年   41篇
  2020年   81篇
  2019年   103篇
  2018年   126篇
  2017年   144篇
  2016年   117篇
  2015年   87篇
  2014年   131篇
  2013年   641篇
  2012年   149篇
  2011年   194篇
  2010年   182篇
  2009年   216篇
  2008年   185篇
  2007年   171篇
  2006年   164篇
  2005年   148篇
  2004年   145篇
  2003年   157篇
  2002年   135篇
  2001年   115篇
  2000年   118篇
  1999年   122篇
  1998年   107篇
  1997年   84篇
  1996年   94篇
  1995年   74篇
  1994年   78篇
  1993年   73篇
  1992年   77篇
  1991年   84篇
  1990年   55篇
  1989年   39篇
  1988年   41篇
  1987年   46篇
  1986年   47篇
  1985年   72篇
  1984年   58篇
  1983年   50篇
  1982年   50篇
  1981年   50篇
  1980年   45篇
  1979年   43篇
  1978年   29篇
  1977年   26篇
  1976年   27篇
  1975年   19篇
  1974年   26篇
  1973年   19篇
排序方式: 共有5238条查询结果,搜索用时 0 毫秒
991.
Cross-border acquisitions via takeover bid are possible, but cross-border asset mergers within the EC are not. This article explores the proposed European Company as the means to cross-border mergers.  相似文献   
992.
State lottery revenues are shown to increase during the week transfer payments are distributed. The timing of the increase in lottery purchases suggests a portion of the transfer payments is used to purchase lottery tickets. In addition to providing information on the timing of lottery purchases, this study finds sales of Pick 3 and Pick 4 tickets increase during the period, while sales of Pick 5 and Pick 6 games do not, suggesting a general preference for the relatively higher probability, smaller jackpot games for the group.
Rodney J. PaulEmail:
  相似文献   
993.
994.
995.
ABSTRACT

The benefits of biofuels depend on the feedstock, conversion pathway and local context. This paper assesses biofuels technology readiness and developments to provide foresight to biofuels development in Southern Africa. Efficient conversion pathways, coupled with biomass from waste or high-yielding energy crops, will reduce both the costs of biofuels production, and the environmental impacts. Compared to petroleum fuels, the current commercial biofuels (ethanol, biogas and biodiesel) typically offer carbon emission reductions of 30–50% but are marginally more expensive. The extent of biofuels market penetration will therefore be influenced by mandates (blending targets) and subsidies (green premium). Advanced biofuels promise greater efficiencies and carbon emission reductions at reduced cost but will require further research and development to reach commercialisation. If developed appropriately, biofuels can reduce carbon emissions and improve energy security, while enabling sustainable agriculture and improved natural resources management.  相似文献   
996.
ABSTRACT

Potential biofuel demand in South Africa is estimated to increase to 1550 million litres by 2025 due to mandatory blending rates. Land and water constraints, however, limit the ability for domestic production. Zambia, due to its abundance in land, suitable climate, supportive set of bioenergy incentives and close geographical location to South Africa, has the potential to meet this increase in demand. Using a dynamic recursive computable general equilibrium model, we estimate the macro- and socio-economic impacts of bioethanol production in Zambia from three potential crops: sugarcane, cassava and sweet sorghum. The results show that the development of a single product bioethanol industry has the potential to increase economic growth without negatively affecting overall food security. Further expansion of the industry to multiple products results in larger gains to growth and welfare.  相似文献   
997.
998.
We focus on understanding the role of productivity in determining wage structure differences between men and women in academia. The data arise from a pay equity study carried out in a single midwestern U.S. university over the 1996–1997 academic year. Econometric results confirm that external market forces exert influence over both male and female salary. But peer review ratings play a significant role in male but not female earnings determination, with similar results for objective measures of research, teaching, and service.  相似文献   
999.
This article considers the model of voluntary, consensus based standardization as developed through the British Standards Institution (BSI) and its contribution to learning and productivity growth. It discusses the significant role played by professional engineers in the model's introduction, its extension at home, and its imitation overseas. It is argued that by 1931 the BSI catalogue of standards represented a considerable stock of codified knowledge whose growth reflected underlying aggregate technological opportunities, assisting in their transformation into technological advance. To help validate this claim, a measure of the size of the BSI catalogue of standards is incorporated into an econometric model of aggregate productivity growth in Britain. Findings show that the growth of the standards catalogue is associated with a substantial proportion of labour productivity growth over the period 1931–2009. Estimates relating to the short‐run dynamics involved are consistent with the idea that there are causal linkages running from standards to growth. When interpreting these findings, it is argued that the overall weight of historical evidence points to standardization—coordinated through the BSI—as providing an important path of learning for the British economy over the period considered.  相似文献   
1000.
This article explores urban agriculture in Cape Town and its organisational forms. Based on a literature review of peer-reviewed articles and grey literature, it examines the state of linkages among urban farmers and various supporting organisations of urban agriculture. Moreover, it examines the coordination of activities among key supporting organisations. By analysing the roles of state and non-state actors and linkages, the article discusses implications for the development of urban agriculture. This article suggests that a lack of effective coordination of initiatives among supporting actors presents a significant pitfall in the development of urban agriculture. Furthermore, the failure of farmers to self-organise is identified as equally detrimental. Therefore, it calls for improved synergies between state and non-state actors involved to ensure that the gains of urban agriculture are enhanced.  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