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   2073篇
  免费   129篇
  国内免费   60篇
财政金融   62篇
工业经济   76篇
计划管理   292篇
经济学   476篇
综合类   319篇
运输经济   18篇
旅游经济   36篇
贸易经济   162篇
农业经济   457篇
经济概况   364篇
  2024年   3篇
  2023年   18篇
  2022年   32篇
  2021年   33篇
  2020年   43篇
  2019年   35篇
  2018年   31篇
  2017年   47篇
  2016年   61篇
  2015年   72篇
  2014年   112篇
  2013年   127篇
  2012年   167篇
  2011年   221篇
  2010年   143篇
  2009年   163篇
  2008年   195篇
  2007年   190篇
  2006年   161篇
  2005年   100篇
  2004年   86篇
  2003年   66篇
  2002年   39篇
  2001年   44篇
  2000年   25篇
  1999年   13篇
  1998年   7篇
  1997年   6篇
  1996年   8篇
  1995年   4篇
  1994年   1篇
  1993年   1篇
  1992年   1篇
  1991年   2篇
  1985年   3篇
  1981年   1篇
  1980年   1篇
排序方式: 共有2262条查询结果,搜索用时 15 毫秒
41.
黔东南地区人居环境评价及优化策略研究   总被引:1,自引:0,他引:1  
文章以黔东南地区为例主要针对城镇化水平下人居环境的发展模式及优化策略展开研究。首先建立了AHP模型,按照指标体系构建原则,构建了适合评价黔东南地区宜居性的科学合理的客观评价指标体系,以经济建设、居住环境、生态环境、公共服务等4个方面作为影响因子,用层次分析法得出综合权重以及各个指标所占的权重,根据得分分析影响黔东南地区宜居性的指标,其中影响黔东南地区宜居性的因素主要是经济建设和居住条件,其次是生态环境和公共服务,根据数据分析得出黔东南地区目前存在经济、社会、环境协调系数不高、城镇化水平偏低、自然资源丰富的现状。根据数据分析和从黔东南地区的实际情况提出强化城市基础设施;保护生态环境,合理利用资源;继承历史,构造文化底蕴;加强治安力度,提升宜居性等4种优化策略。  相似文献   
42.
43.
We propose an alternate context-based extension to the agency theory-grounded explanation of foreign ownership mode choices proposed in the literature. Using a sample of Taiwanese firms investing in the greater China region over the 2001–2009 period, we show that both economic and non-economic factors influence the choice of foreign ownership mode. In addition, we document that higher institutional ownership percentages motivate Taiwanese firms to select shared ownership in the greater China region. Further, no long term compensation mix/ownership structure link is found. These findings run counter to a theory provided for foreign ownership mode choices of US based firms. Our findings provide support for the validity of stewardship and social capital theory, but not financial incentives-based agency theory, for Taiwanese firms investing in the greater China region.  相似文献   
44.
本文建立了带有随机波动率的时变参数向量自回归模型(SV-TVP-VAR),以京津冀地区为研究对象,分析了不同时期新兴产业发展对地区生产总值、财政收入以及就业的影响。研究结果发现:(1)新常态时期新兴产业的发展对京津冀经济状况的影响程度大于在全球经济危机时期和经济高速发展时期的影响程度,但在大部分时期新兴产业的发展都只会对京津冀的经济状况产生负向效应;(2)如果经济增长是首要经济目标,天津应该加强新兴产业的发展,如果就业是首要经济目标,河北应该加强新兴产业的发展。  相似文献   
45.
46.
Sustainable Jet Fuel (SJF) represents an important component of the airline industry's strategy to simultaneously reduce GHG emissions while meeting a growing demand for international air travel. SJFs also have the potential to provide fuel supply diversification and security, enhance fuel price stability and provide regional/rural economic development benefits. This paper measures and ranks perceived drivers and barriers to an economically viable SJF industry in a unique U.S. region, the U.S. Pacific Northwest (PNW), through personal interviews with key aviation fuel supply chain stakeholders conducted from June to September 2015. In addition to providing a fertile arena for this first effort to systematically assess these drivers and barriers, the U.S. PNW is unique due to the region's long strategic focus on aviation innovation and its importance to the regional economy, the seminal efforts in the region to outline a path forward on SJF beginning in 2010, and the relatively small population spread over a large geographic area with a limited number of “hub” airport nodes which geographically concentrates aviation fuel demand and distribution. Nineteen stakeholder interviewees acknowledge that, in order for regional SJF adoption-diffusion to occur, airline jet fuel buyers must drive the process, particularly as they deal with greenhouse gas (GHG) emission issues and related policy considerations. Important perceived barriers to SJF industry scale-up in the U.S. PNW include the high production costs of SJF and related issues, such as fuel logistics and quality control in the transport, storage, and blending of SJFs. Perceptions around chain-of-custody issues, such as blending, tracking, and crediting of SJFs and future SJF market share projections for the year 2030 were also examined. Incorporating stakeholder input into discussions about adding blended SJF into the U.S. aviation fuel supply provides needed insight for the biofuels industry, policymakers, and researchers.  相似文献   
47.
钱恒之  洪托 《价值工程》2015,(1):275-276
鲁奎山铁矿为分布于滇中地区中元古代早期昆阳裂谷中,位于康滇地轴南段,赋存于昆阳群大龙组的菱铁矿床。铁矿产于大龙口组底部条带状灰岩中,呈似层状分布,层控明显。该类型铁矿为目前已探明的昆阳群中最大的铁矿,占云南省内已探明铁矿的20%以上。本文通过对鲁奎山铁矿的区域构造、矿床地质、控矿因素的分析,确定矿床成因,为更好的开发利用此类铁矿提供基础。  相似文献   
48.
This article has attempted to examine the impact of motivation on the purchasing and represents a model for organic or local cucumbers buying dimensions. Data were collected by a sample of 300 people in two northern provinces of Iran during 7 months and were tested using structural equation modeling (SEM) technique. Results indicate that not using pesticides, preserving people’s health, conservation, better taste, and region of origin of organic or local cucumbers have significant positive impacts on purchasing dimensions and persistence has no significant effect on purchasing dimensions.  相似文献   
49.
Places have started to adapt commercial branding tactics. But how do stakeholders perceive such practices? Drawing on survey data from French residents, we analyse the advertising legitimacy of a place brand and its influence on the effectiveness of marketing communications in the context of region branding. The results confirm that advertising legitimacy mediates the relationship between exposure to an advertisement and its efficiency. The place brand is more legitimate when advertisements target firms, residents or tourists than when they promote local products through co-branding. We highlight a new expression of democratic legitimacy: a process adapted to hybrid (public–private) organizations.  相似文献   
50.
区域科技基础条件平台的构建,可以更好的发挥公共科技服务在区域自主创新和科技进步中的作用,有利于减少科技资源布局分散和重复建设等问题,将为区域主导产业的发展起到极大的促进作用,可以确保产业在全国同行业中处于领先地位。本文在解析了区域科技基础条件平台建设影响因素的基础上,分析区域科技基础条件平台构建的目标任务和重点工作内容,并探讨相关的保障措施。  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