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   14242篇
  免费   322篇
财政金融   2993篇
工业经济   1074篇
计划管理   2278篇
经济学   3034篇
综合类   153篇
运输经济   103篇
旅游经济   228篇
贸易经济   2276篇
农业经济   632篇
经济概况   1779篇
信息产业经济   2篇
邮电经济   12篇
  2023年   74篇
  2021年   84篇
  2020年   192篇
  2019年   254篇
  2018年   338篇
  2017年   335篇
  2016年   309篇
  2015年   204篇
  2014年   328篇
  2013年   1609篇
  2012年   386篇
  2011年   470篇
  2010年   425篇
  2009年   439篇
  2008年   410篇
  2007年   358篇
  2006年   333篇
  2005年   266篇
  2004年   275篇
  2003年   276篇
  2002年   272篇
  2001年   279篇
  2000年   293篇
  1999年   294篇
  1998年   300篇
  1997年   264篇
  1996年   224篇
  1995年   219篇
  1994年   239篇
  1993年   243篇
  1992年   263篇
  1991年   253篇
  1990年   201篇
  1989年   184篇
  1988年   166篇
  1987年   165篇
  1986年   169篇
  1985年   241篇
  1984年   256篇
  1983年   246篇
  1982年   212篇
  1981年   196篇
  1980年   170篇
  1979年   169篇
  1978年   156篇
  1977年   134篇
  1976年   123篇
  1975年   139篇
  1974年   101篇
  1973年   101篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
72.
73.
74.
December 1, 1996 a new law was implemented in Portugal to gradually reduce the standard workweek from 44 to 40 h. We study how this mandatory reduction affected employment through job creation and job destruction. There was considerable regional, sectoral and firm-size variation in the share of workers who were affected by the working hours reduction. We exploit this variation to assess the impact of the workweek reduction. We find evidence that the working hours reduction had a positive effect on employment through a fall in job destruction.  相似文献   
75.
This paper was prepared for the 70th birthday of Oleg Sergeevich Pchelintsev, but he did not live to see it in print. For memorials of O.S. Pchelintsev, see www.demoscope.ru Nos 243–244 of April 17–30, 2006. The paper analyzes the channels and ways by which macroeconomic policy impacts the development of urban settlement and individual groups of cities. Its findings are used to validate new directions and measures of urban policy  相似文献   
76.
Increased AIDS mortality and other preexisting conditions have contributed to agricultural productivity declines in the districts of Masaka and Rakai in Uganda. These two districts were the most fertile in Uganda and also had the highest HIV seroprevalence rates in Africa. 66% of study households experienced land use decline to some extent over the past 5 years. The 11% decline in poultry production and 32% decline in cattle production was reportedly due to poor management and loss of grazing land from overpopulation and larger scale farms. The most frequently reported reasons for crop reductions were death and sickness; these was estimated as affecting 8% of families with children under 5 years in the study area. Morbidity and mortality as a reason for the decline was reported two times as much as poverty and decline in international coffee prices. Other reasons for loss of productivity were food shortages and insecurity, loss of income, and reduced ability to respond to educational and medical needs. Cassava is replacing the culturally preferred matooke banana as a crop that is more disease-, pest-, and drought resistant. The banana weevil has been a recent problem. Marginal farming systems have been the most affected by declines in land use and livestock production, but fertile areas have not been spared the impact from AIDS and adult mortality. Poverty has decreased the use of pesticides, herbicides, and fertilizers in the districts. Policy has had an impact on agricultural practices: population growth and inheritance have added to loss of individual land holdings and contributed to fallow periods and infertility. Appropriate land management practices have not been adequately promoted in the agricultural extension service. Civil wars and the drop in coffee prices have reduced the number of farm laborers. Common grazing land has been turned over to large commercial ranches. Government should maintain research and monitoring of declines in food and cash crop production and manpower needs. Policy must be designed to respond to the complicated factors affecting productivity. High AIDS prevalence areas and marginal areas where reduced production effects would be the most severe must be given priority status. Development of cash crop alternatives must be examined and perhaps supported on an experimental basis by donor agencies. Maximum productivity should be encouraged by rural extension and education agencies. A number of other specific recommendations were made for individual survival strategies to maintain high agricultural productivity.  相似文献   
77.
The North American Waterfowl Management Plan seeks to improve wildlife habitat and increase waterfowl numbers through voluntary transactions with farmers to modify their land management practices. The impact of modified land use practices on the incomes of participating farmers and the regional economy are estimated. The compensation offered under the Plan for modification of land use is determined to adequately offset any loss in participants' income. Income losses to the community due to reduced farm input sales were more than offset by the increase in NAWMP direct expenditures (excluding compensation payments). Distributional effects and externalities must be recognized and monitored to ensure success of the program  相似文献   
78.
Recent articles on leasing suggest five principles that should aid analysts to understand this durable, much misunderstood financial instrument. The principles are 1) the lessor must be happy too, 2) the operating inflows have nothing to do with the case, 3) financial, like physical, matter tends to be preserved, 4) debt is a function of after-tax flows, and 5) inability to use tax shelters cuts two ways. In this paper we illustrate these principles and use illustrations to demonstrate that each of these principles has merit. We argue as well that the impression, often left by the principles, that leasing seldom benefits all parties to the transaction is incorrect.  相似文献   
79.
As part of an investigation into the performance of heating systems and the effectiveness of energy saving measures, temperatures have been monitored in forty centrally heated homes. The addition of extra insulation had no effect on the way people operated their heating system or on the temperature level set in the main living room. However, bedrooms were warmer and the importance of individual room temperature controls demonstrated. Differences between people's thermal requirements in domestic and office environments are considered.  相似文献   
80.
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