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随着我国电子商务的发展,对物流配送行业的要求越来越高。针对我国物流配送行业存在的主要问题,在分析现有模式的基础上,提出“混合第四方”的宅配模式,从模式、功能、优势及第四方服务点选址原则四个维度进行电子商务背景下城市宅配模式创新研究以期解决物流配送的短板效应,进一步促进我国物流配送行业和电子商务的发展。 相似文献
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生鲜产品由于其特殊性,在配送过程中存在损耗。针对不同种类的生鲜产品,差异化新鲜度敏感系数,引入生鲜努力保鲜系数,构建生鲜产品新鲜度函数,同时考虑固定成本、运输成本、制冷成本、货损成本及时间惩罚成本,构建了生鲜配送路径优化模型。设计混合遗传粒子群算法进行求解,验证了模型的合理性及算法的有效性。对比不同的生鲜努力保鲜系数对各项成本的影响,得出综合成本最优的保鲜策略,为生鲜企业末端配送优化提供参考。 相似文献
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Marie E. Walsh Daniel G. de la Torre Ugarte Hosein Shapouri Stephen P. Slinsky 《Environmental and Resource Economics》2003,24(4):313-333
The U.S. Departments of Agriculture and Energyjointly analyzed the economic potential for,and impacts of, large-scale bioenergy
cropproduction in the United States. Anagricultural sector model (POLYSYS) wasmodified to include three potential bioenergycrops
(switchgrass, hybrid poplar, and willow). At farmgate prices of US $2.44/GJ, anestimated 17 million hectares of bioenergycrops,
annually yielding 171 million dry Mg ofbiomass, could potentially be produced at aprofit greater than existing agricultural
usesfor the land. The estimate assumes highproductivity management practices are permittedon Conservation Reserve Program
lands. Traditional crops prices are estimated toincrease 9 to 14 percent above baseline pricesand farm income increases annually
by US $6.0billion above baseline.At farmgate prices of US $1.83/GJ, anestimated 7.9 million hectares of bioenergycrops, annually
yielding 55 million dry Mg ofbiomass, could potentially be produced at aprofit greater than existing agricultural usesfor
the land. The estimate assumes managementpractices intended to achieve highenvironmental benefits on Conservation ReserveProgram
lands. Traditional crops prices areestimated to increase 4 to 9 percent abovebaseline prices and farm income increasesannually
by US $2.8 billion above baseline. 相似文献
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基于复杂供应链库存管理策略的系统动力学研究 总被引:4,自引:0,他引:4
在分析了具有不同提前期和加工时间的复杂供应链特点基础上,研究了混合CONWIP/Kanban库存管理思想与同步CONWIP库存管理思想在复杂供应链上的应用。同时借助Vensim建模平台。针对这两种管理思想建立了基于复杂供应链系统的动态仿真模型,并对模拟结果进行了分析。 相似文献
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We examine the pricing difference of Green Bonds (GB) and conventional bonds (CBs) in capital markets worldwide. Credit spread is used to observe whether investors would like to pay a premium for GBs over CBs. This study uses panel data regression with hybrid model to analyse daily observations over the period 2016 to 2017. We employ Option-Adjusted spread (OAS) to measure the credit spreads of bonds while controlling for bond specific, macroeconomic and global factors that influence the spread. With the hybrid model used in the panel data analysis, we were able to capture the fixed-effects of variables in a random effect model. We find that GBs are traded at a premium of 63 basis points (BPS), compared with a comparable corporate bond issue. We find that the green label provides issuers an incentive to raise funds through issuing GBs while providing investors an opportunity to diversify their investments returns. Our findings provide several implications to the major stakeholders driving the GB market to scale up the market to finance the required level of global green investment needs. We stress an urgent need to support the growth of the GB market to achieve sustainable development through mitigating climate change challenges.Abbreviation GB: Green Bond; CB: Conventional Bond; YS: Yield Spread; BPS: Basis Points; OAS: Option-Adjusted Spread; PCSE: Panels Corrected Standard Errors; CPI: Consumer Price Index; GBPs: Green Bond Principles; CBS: Climate Bond Standard 相似文献