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   33717篇
  免费   819篇
财政金融   6108篇
工业经济   2545篇
计划管理   5758篇
经济学   7614篇
综合类   359篇
运输经济   208篇
旅游经济   536篇
贸易经济   5471篇
农业经济   1600篇
经济概况   4218篇
邮电经济   119篇
  2021年   214篇
  2020年   351篇
  2019年   472篇
  2018年   660篇
  2017年   671篇
  2016年   673篇
  2015年   498篇
  2014年   717篇
  2013年   3302篇
  2012年   985篇
  2011年   1049篇
  2010年   848篇
  2009年   1022篇
  2008年   1010篇
  2007年   927篇
  2006年   845篇
  2005年   770篇
  2004年   776篇
  2003年   776篇
  2002年   700篇
  2001年   706篇
  2000年   687篇
  1999年   604篇
  1998年   617篇
  1997年   575篇
  1996年   576篇
  1995年   518篇
  1994年   567篇
  1993年   560篇
  1992年   534篇
  1991年   554篇
  1990年   507篇
  1989年   430篇
  1988年   428篇
  1987年   418篇
  1986年   441篇
  1985年   629篇
  1984年   585篇
  1983年   573篇
  1982年   572篇
  1981年   484篇
  1980年   473篇
  1979年   479篇
  1978年   410篇
  1977年   372篇
  1976年   303篇
  1975年   292篇
  1974年   263篇
  1973年   250篇
  1972年   214篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
Agricultural policies in sub-Saharan Africa have paid insufficient attention to sustainable intensification. In Uganda, agricultural productivity has stagnated with aggregate increases in crop production being attributed to expansion of cultivated land area. To enhance sustainable crop intensification, the Ugandan Government collaborated with stakeholders to develop agricultural policies using an evidence-based approach. Previously, evidence-based decision-making tended to focus on the evidence base rather than evidence and its interactions within the broader policy context. We identify opportunities and pitfalls to strengthen science engagement in agricultural policy design by analysing the types of evidence required, and how it was shared and used during policy development. Qualitative tools captured stakeholders' perspectives of agricultural policies and their status in the policy cycle. Subsequent multi-level studies identified crop growth constraints and quantified yield gaps which were used to compute the economic analyses of policy options that subsequently contributed to sub-national program planning. The study identified a need to generate relevant evidence within a short time 'window' to influence policy design, power influence by different stakeholders and quality of stakeholder interaction. Opportunities for evidence integration surfaced at random phases of policy development due to researchers’ ’embededness’ within co-management and coordination structures.  相似文献   
993.
994.
Plastic bag litter generates serious environmental concerns and poses a risk to wildlife. As this does not seem to be a problem which can be resolved by the private sector alone, or by ‘Coasean’ negotiation, legislation is proposed, particularly focusing on ‘one‐use’ bags. This article surveys legislation worldwide, while concentrating on lessons from the United States and the United Kingdom. The issues are more complex than is often assumed. While environmentalists argue for restriction and ultimate elimination of one‐use bags, manufacturers, especially those that have reformulated the composition of their bags, see legislation as an overreaction to a problem that is already being addressed within the industry. They cite evidence that, when used within a comprehensive recycling programme, plastic bags are not only cost‐effective but a sound use of our limited resources. Bans or restrictions can have knock‐on effects which can create new problems.  相似文献   
995.
Aims: To assess and compare the direct healthcare and non-healthcare costs and government subsidies by body weight and diabetes status.

Methods: The Australian Diabetes, Obesity and Lifestyle study collected health service utilization and health-related expenditure data at the 2011–2012 follow-up surveys. Costing data were available for 4,409 participants. Unit costs for 2016–2017 were used where available or were otherwise inflated to 2016–2017 dollars. Age- and sex-adjusted costs per person were estimated using generalized linear models.

Results: The annual total direct cost ranged from $1,998 per person with normal weight to $2,501 per person with obesity in participants without diabetes. For those with diabetes, total direct costs were $2,353 per person with normal weight, $3,263 per person with overweight, and $3,131 per person with obesity. Additional expenditure as government subsidies ranged from $5,649 per person with normal weight and no diabetes to $8,085 per person with overweight and diabetes. In general, direct costs and government subsidies were higher for overweight and obesity compared to normal weight, regardless of diabetes status, but were more noticeable in the diabetes sub-group. The annual total excess cost compared with normal weight people without diabetes was 26% for obesity alone and 46% for those with obesity and diabetes.

Limitations: Participants included in this study represented a healthier cohort than the Australian population. The relatively small sample of people with both obesity and diabetes prevented a more detailed analysis by obesity class.

Conclusion: Overweight and obesity are associated with increased costs, which are further increased in individuals who also have diabetes. Interventions to prevent overweight and obesity or reduce weight in people who are overweight or obese, and prevent diabetes, should reduce the financial burden.  相似文献   
996.
997.
998.
999.
We introduce a new explanation for one of the most pronounced phenomena on the American business landscape in recent decades: a dramatic increase in attributions of CEO significance. Specifically, we test the possibility that America's CEOs became seen as increasingly significant because they were, in fact, increasingly significant. Employing variance partitioning methodologies on data spanning 60 years and more than 18,000 firm‐years, we find that the proportion of variance in performance explained by individual CEOs, or “the CEO effect,” increased substantially over the decades of study. We discuss the theoretical and practical implications of this finding. Copyright © 2014 John Wiley & Sons, Ltd.  相似文献   
1000.
ABSTRACT

The paper probes into an antithetical aspect of China’s economic reforms in the global context by focusing on the recent developments of China’s intellectual property regime. By analyzing this cutting-edge legal system, it highlights China’s political divergence against its economic convergence in its decade-long reforms, in particular, its state-oriented innovation system as against the world’s neo-liberal economic order. The last decade witnessed China’s preeminent transformation from a passive follower to a proactive advocator of IP standards. However, certain entrenched limits characterizing China’s state-oriented economy and cultural systems such as information blockade and coercive technology transfer serve as catalysts that are apt to provoke acrimonious confrontation between China and major economies. In this sense, China’s incomplete reforms have taken on a new form: as China’s influence on the global economy grows, conflicts of diverse national priorities become more palpable than simple-minded economic cooperation.  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