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   11182篇
  免费   265篇
财政金融   2150篇
工业经济   1061篇
计划管理   1865篇
经济学   2487篇
综合类   133篇
运输经济   89篇
旅游经济   226篇
贸易经济   1974篇
农业经济   581篇
经济概况   877篇
信息产业经济   2篇
邮电经济   2篇
  2023年   56篇
  2021年   61篇
  2020年   131篇
  2019年   179篇
  2018年   194篇
  2017年   217篇
  2016年   221篇
  2015年   152篇
  2014年   238篇
  2013年   1466篇
  2012年   294篇
  2011年   412篇
  2010年   286篇
  2009年   352篇
  2008年   330篇
  2007年   341篇
  2006年   341篇
  2005年   313篇
  2004年   290篇
  2003年   313篇
  2002年   314篇
  2001年   276篇
  2000年   230篇
  1999年   244篇
  1998年   246篇
  1997年   231篇
  1996年   207篇
  1995年   177篇
  1994年   164篇
  1993年   192篇
  1992年   164篇
  1991年   162篇
  1990年   138篇
  1989年   120篇
  1988年   124篇
  1987年   106篇
  1986年   124篇
  1985年   195篇
  1984年   207篇
  1983年   167篇
  1982年   170篇
  1981年   159篇
  1980年   162篇
  1979年   158篇
  1978年   115篇
  1977年   111篇
  1976年   101篇
  1975年   75篇
  1974年   98篇
  1973年   58篇
排序方式: 共有10000条查询结果,搜索用时 10 毫秒
81.
This paper is motivated by automated valuation systems, which would benefit from an ability to estimate spatial variation in location value. It develops theory for the local regression model (LRM), a semiparametric approach to estimating a location value surface. There are two parts to the LRM: (1) an ordinary least square (OLS) model to hold constant for interior square footage, land area, bathrooms, and other structural characteristics; and (2) a non-parametric smoother (local polynomial regression, LPR) which calculates location value as a function of latitude and longitude. Several methods are used to consistently estimate both parts of the model. The LRM was fit to geocoded hedonic sales data for six towns in the suburbs of Boston, MA. The estimates yield substantial, significant and plausible spatial patterns in location values. Using the LRM as an exploratory tool, local peaks and valleys in location value identified by the model are close to points identified by the tax assessor, and they are shown to add to the explanatory power of an OLS model. Out-of-sample MSE shows that the LRM with a first-degree polynomial (local linear smoothing) is somewhat better than polynomials of degree zero or degree two. Future applications might use degree zero (the well-known NW estimator) because this is available in popular commercial software. The optimized LRM reduces MSE from the OLS model by between 5 percent and 11 percent while adding information on statistically significant variations in location value.  相似文献   
82.
83.
Internationally dispersed technology units are classified using a system based upon three clearly defined dimensions: Type of technical work (research, development or support); functional areas with which the technology unit collaborates in its work (marketing, manufacturing, marketing and manufacturing, or none); and geographic area of collaboration (local, international). The resulting eight category taxonomy is shown to provide an improved platform for organizing and integrating the literature on the management of internationally dispersed technology units and for articulating theoretical issues in ongoing programs of empirical research.  相似文献   
84.
This study investigates the influence of the source of R&D funds and management ownership on R&D productivity. The lagged effect of the source of R&D funds on R&D output is investigated for a sample of US manufacturing firms in five industries over the 1996–99 period. Estimates based on 779 firm-years show that R&D productivity increases with the proportion of stock held by managers and directors of firms primarily in the Other Electronics industry. The estimates also show that recipients of government-sponsored R&D funds in the Chemicals industry have lower levels of output (sales) for each dollar committed to R&D. In addition, output for firms in the Chemicals industry worsens as management stockholding increases, implying an agency cost rationale for the observed difference in output. The implication is that firms with high manager-owner content are less productive with government-sponsored R&D than with company-financed R&D. The reported results suggest that potential agency costs should be incorporated in government-sponsored R&D contracts. It also suggests that the source of R&D funds should be disclosed and incorporated into the valuation of intangible assets attributable to research and development.  相似文献   
85.
This paper is essentially a summary of the book Measuring the Nation's Wealth (Volume 29, Studies in Income and Wealth, New York: National Bureau of Economic Research, 1964), which is the report of study directed by the author. The purpose o f the study was to assess the problems and possibilities of conducting a national census of real wealth as a basis for continuing wealth and balance sheet estimates for the U.S. economy, by major sector.
It is stressed that the balance sheets and wealth estimates should be designed as a consistent part of an integrated system of national income accounts. Thus, valuation (at market prices and/or depreciated replacement costs), sectoring, and type-of-asset detail in the basic data and derived estimates should be compatible with the flow estimates contained in the economic accounts. Consistency of stock and flow estimates facilitates analysis of inter-relationships, and is helpful in the estimation process.
It is recommended that in the U.S. asset data by broad categories be collected as part of the recurring economic censuses and other reporting systems, but that detail on fixed reproducible assets (construction and equipment) at cost, by year or period of acquisition, be obtained from a small sample of respondents in each industry. The detail would be useful in its own right, and also permit revaluation of the assets by use of price indexes and depreciation rates to a current depreciated replacement cost basis. Where feasible, respondent estimates of market values would also be obtained.
The proposal is thus a compromise between the Japanese 1955 sample survey of assets, and the detailed wealth inventory of the U.S.S.R. which was begun in 1959. Preliminary work is now underway in the U.S. federal statistical agencies to expand collection of asset data, and to prepare comprehensive wealth estimates in the framework of the national income accounts.  相似文献   
86.
87.
88.
The importance of customer input in the development of very new products   总被引:3,自引:0,他引:3  
This research explores the acquisition of customer input and its importance in the development of very new products. Data were gathered on 55 product development projects from the computer telephony integration industry – a new industry experiencing rapid technological change. The data were used to test hypotheses concerning the relationships between product newness, the importance of customer input in the development process, and the use of customer intensive market research methods. We found that the importance of customer input increases with market newness of a product up to a point and then drops off for very new products, whereas the importance of customer input increases with technological newness of a product without dropping off. We also found that the importance of customer input significantly increases the use of customer intensive market research methods; whereas, neither market nor technological product newness in themselves had much direct effect on research methods.  相似文献   
89.
This article uses vector autoregression analysis to examine the relative impacts on black and white employment growth of monetary and fiscal actions. It was found that the employment responses to anticipated policy actions, while significant, were generally short-lived, with the exception of the effects of anticipated money growth on white employment. The influences of unanticipated policy changes are of a longer duration. The predominant finding in which black employment growth responded differently from white employment growth was in response to a monetary shock. The black employment response was sharply negative while the white employment response was a gradual increase over nine quarters. The results indicate that this difference occurred only during the 1980s and not in the 1970s and suggests that the effects of bank failures and credit rationing during this period may have significantly hurt minority employment opportunities.  相似文献   
90.
UK Industrial Policy: Old Tunes on New Instruments?   总被引:1,自引:0,他引:1  
This paper discusses the current Labour government's industrialpolicy—as most recently reflected in its document on manufacturingstrategy—in the context of industrial policy in the UKover the last 50 years and the form that it has taken elsewherein Europe. It concludes that the thematic priorities for UKindustrial policy in the 1960s—international competitiveness,innovation, competition, and skills—continue to be thekey themes of UK policy today. The paper presents data thatillustrate the gaps that exist in key indicators of performancebetween the UK and its main economic competitors. The differencebetween the 1960s and the 2000s is that there are new instrumentsof policy. Two areas in particular are focused on—competitionpolicy and technology policy—and an attempt is made toassess the likely effectiveness of these new instruments. Thepaper concludes that the international evidence base for thesenew approaches is reasonably robust but that it is still toosoon to tell if they are having the hoped-for impact on theperformance of the UK economy.  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