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   8005篇
  免费   225篇
  国内免费   1篇
财政金融   1264篇
工业经济   628篇
计划管理   1395篇
经济学   1761篇
综合类   66篇
运输经济   79篇
旅游经济   139篇
贸易经济   1488篇
农业经济   296篇
经济概况   1106篇
信息产业经济   1篇
邮电经济   8篇
  2023年   52篇
  2022年   34篇
  2021年   75篇
  2020年   144篇
  2019年   191篇
  2018年   247篇
  2017年   286篇
  2016年   263篇
  2015年   153篇
  2014年   224篇
  2013年   921篇
  2012年   304篇
  2011年   352篇
  2010年   265篇
  2009年   318篇
  2008年   279篇
  2007年   250篇
  2006年   239篇
  2005年   266篇
  2004年   250篇
  2003年   231篇
  2002年   177篇
  2001年   153篇
  2000年   151篇
  1999年   166篇
  1998年   135篇
  1997年   109篇
  1996年   121篇
  1995年   99篇
  1994年   104篇
  1993年   91篇
  1992年   95篇
  1991年   100篇
  1990年   75篇
  1989年   56篇
  1988年   60篇
  1987年   66篇
  1986年   64篇
  1985年   84篇
  1984年   70篇
  1983年   57篇
  1982年   68篇
  1981年   67篇
  1980年   63篇
  1979年   51篇
  1978年   40篇
  1977年   34篇
  1976年   32篇
  1975年   30篇
  1974年   33篇
排序方式: 共有8231条查询结果,搜索用时 15 毫秒
61.
Before embarking on the development of rural areas or regions it seems necessary to answer the following key questions: what goals of the parties involved can be realized, and where, when and how? To tackle these questions we have developed a ‘roadmap’, as part of an overall sustainable development procedure for physical planning and spatial management in rural areas. The roadmap is a tool for the process manager and the people involved. It helps to find the way in the exploration of the potential social, economic and ecological benefits of developing the area or region. The purpose of using the roadmap is to alleviate doubts about the advantages of cooperating in pursuit of sustainable development. A back-casting approach is applied to create appealing visions of the future and visualize mutual opportunities worth implementing. In this article we first describe the need for this new roadmap. We then describe its use, step by step and in some detail. An example of the exploration process is described and the strengths and weaknesses of the roadmap are discussed.  相似文献   
62.
To achieve an environmental objective at least cost, decision makers must integrate information about spatially variable biophysical and economic conditions. Although the biophysical attributes that contribute to an environmental outcome are often known, the way in which these attributes interact to produce the outcome is often unknown. We introduce a nonparametric conservation targeting approach that relies on distance functions to cost-efficiently allocate conservation funds. We apply the approach empirically to the case of conservation contracting for water-quality objectives. The contract portfolios derived from the application have many desirable properties, including intuitive appeal and robust performance across plausible parametric scoring measures.  相似文献   
63.
64.
Global leaders agree on the need to substantially decarbonize the global economy by 2050. This paper compares potential costs associated with different policy pathways to achieve tourism sector emission reduction ambitions (?50% by 2035) and transform the sector to be part of the mid-century decarbonized economy (?70% by 2050). Investment in emissions abatement within the tourism sector, combined with strategic external carbon offsets, was found to be approximately 5% more cost effective over the period 2015–2050 than exclusive reliance on offsetting. The cost to achieve the ?50% target through abatement and strategic offsetting, while significant, represents less than 0.1% of the estimated global tourism economy in 2020 and 3.6% in 2050. Distributed equally among all tourists (international and domestic), the cost of a low-carbon tourism sector is estimated at US$11 per trip, equivalent to many current travel fees or taxes. Exclusive reliance on offsetting would expose the sector to extensive and continued carbon liability costs beyond mid-century and could be perceived as climate inaction, increasing reputational risks and the potential for less efficient regulatory interventions that could hinder sustainable tourism development. Effective tourism sector leadership is needed to develop a strategic tourism policy framework and emission measurement and reporting system.  相似文献   
65.
Despite all best efforts, the design process often leads to the introduction of products that do not meet customer expectations. Although the design team typically applies customer-related information from several sources, the product design somehow fails to satisfy customer requirements. Clearly, we need to develop a better understanding of the process by which designers in large development organizations transform information about customer requirements into the final design specification. To improve our understanding of this process, Antonio J. Bailetti and Paul F. Litva examine design managers' perspectives on the sources of customer requirement information. During the evolution of a product design, the design team applies information that is endorsed by marketing and product management. Common sources of such information include commercial specifications, inferences from existing products and services, deployment studies, and external standards. When this management-endorsed information is deemed inadequate, designers supplement it by creating and sharing their own customer-related information. This local information includes the results of benchmarking function and performance, the designers' perceptions of a service provider's installed base of equipment, and validations of intermediate designs. Marketing and product management cannot easily review the local information that designers create and share in evolving a final design. This article highlights the importance of creating mechanisms for ensuring that customer requirement information from various sources is internally consistent. To meet this goal of consistency, organizations must ensure that customer requirements information produced by marketing satisfies the information processing requirements of the design community. In addition, the knowledge that designers actually apply to produce a design must incorporate customer requirement information endorsed by marketing and product management at all stages of product development.  相似文献   
66.
ABSTRACT

This article discusses some of the issues regarding the first employees to work in a space hotel. As space hotels initially will be vastly different to existing hotels on Earth, it is important to question what human resource challenges this will raise for hospitality workers and providers. To assist reflection on this issue, the notions of space tourism and space tourist are explored, and a definition of a space hotel is included to create product and service boundaries. Plausible futures methodology is used to create five main human resource considerations and concludes by suggesting this sector is largely unexplored.  相似文献   
67.
Ecotourism in private reserves combines the establishment of protected areas with an incentive mechanism to conserve biodiversity. Brazil's private reserve system is well-established but little is known about its links to tourism. This study puts the global private protected area into context and quantifies the extent to which ecotourism has been adopted as a sustainable land-use practice on private reserves in Brazil. Our findings demonstrate that small reserves do contribute to conservation and are used for ecotourism. The belief that large reserves are necessary for ecotourism and conservation is challenged. Only 4% (n = 45) of the 1182 reserves are engaged in ecotourism, mainly those within the Atlantic Forest biome and these are generally small in size (<50 ha). Reserves provide modest to basic accommodation as well as education and economic opportunities that include adjacent communities. Hiking and bird watching are the most popular activities but many reserves are threatened by poaching and invasive species. The low adoption of ecotourism appears due to a combination of factors, including lack of landowner interest, constraints imposed by regulations, logistics and anthropogenic threats. Nonetheless, there is potential to expand ecotourism within private reserves as 143 further private reserves are located near those already engaged in ecotourism.  相似文献   
68.
This paper starts from the stylized fact that firm size and exporting tends to be positively related. Using large sets of establishment panel data for three different industries from official statistics, evidence is presented that the familiar picture of an export/sales ratio that increases (at a decreasing rate) with firm size vanishes if unobserved firm heterogeneity is controlled for in a fixed-effects fractional logit regression model. This finding is well in line with the fact that many small firms are “hidden export champions.” JEL no. F10, D21, L60  相似文献   
69.
70.
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