全文获取类型
收费全文 | 10381篇 |
免费 | 231篇 |
国内免费 | 1篇 |
专业分类
财政金融 | 1926篇 |
工业经济 | 887篇 |
计划管理 | 1804篇 |
经济学 | 2290篇 |
综合类 | 230篇 |
运输经济 | 48篇 |
旅游经济 | 143篇 |
贸易经济 | 1653篇 |
农业经济 | 418篇 |
经济概况 | 1183篇 |
信息产业经济 | 1篇 |
邮电经济 | 30篇 |
出版年
2020年 | 115篇 |
2019年 | 146篇 |
2018年 | 193篇 |
2017年 | 221篇 |
2016年 | 209篇 |
2015年 | 147篇 |
2014年 | 198篇 |
2013年 | 961篇 |
2012年 | 283篇 |
2011年 | 286篇 |
2010年 | 278篇 |
2009年 | 318篇 |
2008年 | 296篇 |
2007年 | 273篇 |
2006年 | 219篇 |
2005年 | 213篇 |
2004年 | 203篇 |
2003年 | 210篇 |
2002年 | 165篇 |
2001年 | 221篇 |
2000年 | 216篇 |
1999年 | 186篇 |
1998年 | 182篇 |
1997年 | 214篇 |
1996年 | 190篇 |
1995年 | 198篇 |
1994年 | 176篇 |
1993年 | 179篇 |
1992年 | 203篇 |
1991年 | 204篇 |
1990年 | 160篇 |
1989年 | 161篇 |
1988年 | 127篇 |
1987年 | 132篇 |
1986年 | 143篇 |
1985年 | 196篇 |
1984年 | 171篇 |
1983年 | 189篇 |
1982年 | 147篇 |
1981年 | 189篇 |
1980年 | 156篇 |
1979年 | 176篇 |
1978年 | 149篇 |
1977年 | 129篇 |
1976年 | 133篇 |
1975年 | 112篇 |
1974年 | 111篇 |
1973年 | 91篇 |
1972年 | 70篇 |
1971年 | 60篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
92.
93.
Different viewpoints were expressed at the 1990 annual national conference of the South African Society for Agricultural Extension regarding the role of extension in the development of the farmer as entrepreneur. It is expected that public funding will increasingly be limited to functions of general public interest. To achieve independence farmers should be willing to expose themselves to entrepreneur development stimuli. it is in the public interest to develop scarce human, economic and natural resources. Research findings indicate distinct behavioral differences between entrepreneurs of differing perceptions. A comprehensive interdisciplinary education is recommended for agriculturalists. Because needs change, education programmes must be re‐evaluated from time to time. It serves little purpose to educate people in extension who do not have a technical message to communicate. The state extension service seeks closer cooperation and liaison with agricultural co‐operative and private sector know‐how. Departmental policy will probably be less rigid in future.
A clear distinction should be made between information and extension services. The adoption of an ethical code for extensionists may be opportune. Relevancy is an important contributing factor to extensionist credibility. 相似文献
94.
Blake PB 《Hospital materiel management quarterly》1990,12(2):1-8
As a result of the productivity study in both areas, the following objectives can be attained: Ascertain the number of FTEs necessary for staffing requirements. Determine the efficiency level in daily production of trays and sets. Develop standards to measure the overall effectiveness in delivering service. Although this represents a quantitative analysis of the productivity within a CSS department, it is important not to forget the human element in the relationship between CSS and OR employees. 相似文献
95.
96.
97.
Regional, national, and spatially explicit scenarios of demographic and economic change based on SRES 总被引:4,自引:0,他引:4
We report here spatially explicit scenario interpretations for population and economic activity (GDP) for the time period 1990 to 2100 based on three scenarios (A2, B1, and B2) from the IPCC Special Report on Emissions Scenarios (SRES). At the highest degree of spatial detail, the scenario indicators are calculated at a 0.5 by 0.5 degree resolution. All three scenarios follow the qualitative scenario characteristics, as outlined in the original SRES scenarios. Two scenarios (B1 and B2) also follow (with minor adjustments due to scenario improvements) the original SRES quantifications at the level of 4 and 11 world regions respectively. The quantification of the original SRES A2 scenario has been revised to reflect recent changing perceptions on the demographic outlook of world population growth. In this revised “high population growth” scenario, A2r world population reaches some 12 billion by 2100 (as opposed to some 15 billion in the original SRES A2 scenario) and is characterized by a “delayed fertility transition” that is also mirrored in a delayed (economic) development catch-up, resulting in an initially stagnating and subsequently only very slow reduction in income disparities. The spatially explicit scenario interpretation proceeds via two steps. Through a combination of decomposition and optimization methods, world regional scenario results are first disaggregated to the level of 185 countries. In a subsequent second step, national results are further disaggregated to a grid cell level, taking urbanization and regional (rural–urban) income disparities explicitly into account. A distinguishing feature of the spatially explicit scenario results reported here is that both methodologies, as well as numerical assumptions underlying the “downscaling” exercise, are scenario-dependent, leading to distinctly different spatial patterns of population and economic activities across the three scenarios examined. 相似文献
98.
Richard B. Howarth 《Ecological Economics》2007,63(4):656-663
This paper examines the concept of sustainability and its implications for environmental policy analysis. It builds on the premise that present society holds a moral obligation to pass on a world of undiminished life opportunities to members of future generations. Maintaining life opportunities, in turn, can be achieved by maintaining or improving a diverse set of resources and capabilities that support a person's freedom to define and pursue her own conception of the good life. On an operational level, this framework points to the following guideline for environmental policy: Protecting the rights of future generations requires either the conservation of environmental resources or compensatory measures (including the provision of substitute technologies) that ensure the fair and proportionate sharing of net benefits over intergenerational time scales. In this framework, resource depletion is permissible only if (with reasonable certainty) it would generate a Pareto improvement relative to a baseline scenario involving strict resource conservation. 相似文献
99.
Carbon Taxes and Joint Implementation. An Applied General Equilibrium Analysis for Germany and India
Christoph Böhringer Klaus Conrad Andreas Löschel 《Environmental and Resource Economics》2003,24(1):49-76
Germany has committed itself toreducing its carbon emissions by 25 percent in2005 as compared to 1990 emission levels. Toachieve this goal, the government has recentlylaunched an environmental tax reform whichentails a continuous increase in energy taxesin conjunction with a revenue-neutral cut innon-wage labor costs. This policy is supposedto yield a double dividend, reducing both, theproblem of global warming and high unemploymentrates. In addition to domestic actions,international treaties on climate protectionallow for the supplementary use of flexibleinstruments to exploit cheaper emissionreduction possibilities elsewhere. One concreteoption for Germany would be to enter jointimplementation (JI) with developing countriessuch as India where Germany pays emissionreduction abroad rather than meeting itsreduction target solely by domestic action. Inthis paper, we investigate whether anenvironmental tax reform cum JI providesemployment and overall efficiency gains ascompared to an environmental tax reformstand-alone. We address this question in theframework of a large-scale general equilibriummodel for Germany and India where Germany mayundertake JI with the Indian electricitysector. Our main finding is that JI offsetslargely the adverse effects of carbon emissionconstraints on the German economy. JIsignificantly lowers the level of carbon taxesand thus reduces the total costs of abatementas well as negative effects on labor demand. Inaddition, JI triggers direct investment demandfor energy efficient power plants produced inGermany. This provides positive employmenteffects and additional income for Germany. ForIndia, joint implementation equips itselectricity industry with scarce capital goodsleading to a more efficient power productionwith lower electricity prices for the economyand substantial welfare gains. 相似文献
100.