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   2129篇
  免费   98篇
  国内免费   1篇
财政金融   448篇
工业经济   204篇
计划管理   331篇
经济学   390篇
综合类   21篇
运输经济   48篇
旅游经济   69篇
贸易经济   392篇
农业经济   139篇
经济概况   181篇
信息产业经济   1篇
邮电经济   4篇
  2022年   8篇
  2021年   17篇
  2020年   25篇
  2019年   49篇
  2018年   55篇
  2017年   68篇
  2016年   68篇
  2015年   49篇
  2014年   66篇
  2013年   226篇
  2012年   85篇
  2011年   80篇
  2010年   61篇
  2009年   91篇
  2008年   84篇
  2007年   82篇
  2006年   65篇
  2005年   71篇
  2004年   65篇
  2003年   85篇
  2002年   60篇
  2001年   58篇
  2000年   55篇
  1999年   48篇
  1998年   42篇
  1997年   42篇
  1996年   43篇
  1995年   23篇
  1994年   30篇
  1993年   27篇
  1992年   24篇
  1991年   34篇
  1990年   23篇
  1989年   24篇
  1988年   35篇
  1987年   11篇
  1986年   16篇
  1985年   25篇
  1984年   36篇
  1983年   29篇
  1982年   19篇
  1981年   20篇
  1980年   22篇
  1979年   11篇
  1978年   7篇
  1977年   9篇
  1976年   13篇
  1975年   7篇
  1974年   8篇
  1973年   9篇
排序方式: 共有2228条查询结果,搜索用时 0 毫秒
121.
Beef ranchers in British Columbia rely upon Crown range for a large proportion of their summer and fall grazing needs. Any improvement in the management policies for this resource can enhance the economic viability of the beef sector. The objective of this study is to evaluate the stocking levels of stock ranges administered by range agrologists and to compare their assessment with that derived using a more formal planning procedure. The report details the stocking capacity for the Punchaw Stock Range in the Prince George range district. Capacities for other stock ranges are also estimated. When rotational uses are defined and examined, the optimal use pattern results in carrying capacities that are approximately double that of current or recommended stocking levels. Les producteurs de bovins de Colombie-Britannique dépendent des parcours de la Couronne pourune grande partie de leurs besoins en pâturages ?été et ?automne. Toute amélioration des politiques de gestion de cette ressource risque ?avoir un effet salutaire sur la viabilité économique du secteur des bovins. La présente étude avait pour objectif ?évaluer ?intensity de pâturage sur les parcours gérés par des agronomes et de comparer leur évaluation à celle obtenue au moyen ?une méthode de planification répondant à des critères plus officiels. Nous fournissons des données détaillées sur la capacité de charge correspondant du parcours Punchaw, dans le district Prince George. Nous procédons en outre à ?évaluation de la capacité de charge ?autres parcours. Lorsque ?exploitation en rotation est définie et examinée, le calcul de ?utilisation optimale donne une capacité de charge correspondant approximativement au double des valeurs actuelles ou recommandées.  相似文献   
122.
There are two types of micro-states, islands and mainland ones. Except for a few islands very close to the coast, most of the insular micro-states are demographically very different from the rest of the Third World. Their death-rates are lower, their birth-rates lower, and the propensity of their populations to migrate to developed countries higher. It is argued here that these differences are based on other social and economic differences, which can be summarized by saying that such states are more Westernized. They were part of the European maritime system at a time when the West did not have the economic strength to penetrate continental areas to the same extent. On the whole they retained colonial links longer.  相似文献   
123.
The objectives of this study were as follows: (1) Formulate a theoretical model of the typical medical practice as a system for producing medical care, with particular attention to the role of middle-level health workers such as graduates of Duke University's Physician's Associate Program. (2) Develop a methodology for collecting data necessary to estimate the relevant parameters in the model, and to describe current patterns of utilization of Duke PA's. (3) Draw substantive conclusions, insofar as the model and data collection methodology permit, about the actual and potential productivity of Duke PA's.As of October 1971 Duke University had graduated 68 PA's from its Physician's Associate Program. Of these, 34 are employed as assistants in family practice or general medicine in a variety of private and institutional settings. Data were collected on eleven of these 34 PA's. No attempt was made to study the other 34 graduates engaged in clinical specialties, administration, or other functions. Neither was any attempt made to collect data on or draw inferences about the utilization and productivity of graduates of any other program such as the MEDEX Program.4  相似文献   
124.
125.
This analysis seeks to relate the processes of different production modes to product characteristics and incomes of consumers within a particular industry. A dynamic interpretation of the cross-sectional relationships suggests that with rising incomes consumers pass through the product and process characteristics of the earliest pre-capitalist formations to those of successively later periods.  相似文献   
126.
The persuaders     
Birnbaum JH 《Fortune》2003,148(3):121-2, 124
  相似文献   
127.
Graham H May 《Futures》1998,30(9):887-899
Technology has always had an influence on the form of settlements, but only since the coming of Information Technology has it aroused much interest from academics and planners. The impact that IT is likely to have on urban areas is debated, some foreseeing decentralisation and the end of place, while others see evidence of the centralisation of control in a global economy. Other new technologies may also affect cities as new materials provide the opportunity for different styles of building. As we enter the 21st century, however, we do so with the largest stock of urban capital ever, much of which is ageing and in need of maintenance. Technology is part of a complex interrelationship of influences on urban areas and much of it will have to be retrofitted on to the pre-existing environment.  相似文献   
128.
Using Piaget's (1970) theory of cognitive development, the present study examines when children first begin to demonstrate team loyalty. An interview and testing protocol was administered to children aged 5-6 and 8-9. Preoperational, transitional, and concrete operational children were capable of demonstrating a psychological commitment to a favorite team that was resistant to change, but not the behavioral consistency indicative of loyalty. The current study demonstrates that children form preferences for sports teams early in life and that they are capable of forming a commitment to a sports team as young as age 5. The present study is one of the first efforts to include a transitional phase in the assessment of cognitive development. Results from the interviews showed that fathers were the most influential socializing agent relative to introducing children to sports teams and that the gender stereotype associating sports with males was prevalent among children in both age groups.  相似文献   
129.
An understanding of customers’ perceptions of value is fundamental to the competitive nature of all industries. Using the timeshare resort sector as a context for our studies, we explore the ways in which consumers, grouped according to their timeshare ownership stage, perceive value. Data were collected from three samples: non-owners of timeshare, recent purchasers of timeshare, and longer-term timeshare owners. Value was shown to be multi-dimensional, with a stable pattern of eleven correlated value factors evident in all three samples. The groups differed in their assessments of the different dimensions of value. In all groups, however, value was positively correlated with attitudes and future intentions regarding timeshare. Self-image congruency explained additional criterion variance. The findings demonstrate that, even among consumers who have never used timeshare, value and self-image congruency are substantial and unique predictors of attitudes and intentions regarding this tourism product.  相似文献   
130.
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