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   11712篇
  免费   373篇
财政金融   1828篇
工业经济   820篇
计划管理   1697篇
经济学   2132篇
综合类   119篇
运输经济   69篇
旅游经济   153篇
贸易经济   1493篇
农业经济   475篇
经济概况   1071篇
水利工程   2206篇
信息产业经济   1篇
邮电经济   21篇
  2021年   98篇
  2020年   142篇
  2019年   219篇
  2018年   280篇
  2017年   280篇
  2016年   293篇
  2015年   172篇
  2014年   263篇
  2013年   1078篇
  2012年   429篇
  2011年   432篇
  2010年   332篇
  2009年   373篇
  2008年   406篇
  2007年   391篇
  2006年   435篇
  2005年   321篇
  2004年   333篇
  2003年   219篇
  2002年   237篇
  2001年   234篇
  2000年   246篇
  1999年   214篇
  1998年   221篇
  1997年   209篇
  1996年   219篇
  1995年   185篇
  1994年   180篇
  1993年   187篇
  1992年   195篇
  1991年   198篇
  1990年   185篇
  1989年   145篇
  1988年   127篇
  1987年   126篇
  1986年   137篇
  1985年   196篇
  1984年   158篇
  1983年   146篇
  1982年   120篇
  1981年   144篇
  1980年   136篇
  1979年   133篇
  1978年   139篇
  1977年   74篇
  1976年   102篇
  1975年   78篇
  1974年   73篇
  1973年   75篇
  1972年   71篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
991.
This study extends existing research into the value relevance of reconciliations to U.S. GAAP by examining the role of analysts' earnings forecasts in explaining potential market reactions to the earnings reconciliation. One possible reason why the evidence on the value relevance of the earnings reconciliation is weak is that earnings are forecast by analysts. Their forecasts may pre-empt some of the information content of the earnings reconciliation disclosures. Our findings indicate that analysts' forecasts are value relevant and that they play a pre-emptive role for some firms. For others, however, the earnings reconciliation has information content that is not pre-empted by analysts' forecasts.  相似文献   
992.
This study examines the relation between audit quality and earnings management. Consistent with prior research, we treat audit quality as a dichotomous variable and assume that Big Six auditors are of higher quality than non-Big Six auditors. Earnings management is captured by discretionary accruals that are estimated using a cross-sectional version of the Jones 1991 model. Prior literature suggests that auditors are more likely to object to management's accounting choices that increase earnings (as opposed to decrease earnings) and that auditors are more likely to be sued when they are associated with financial statements that overstate earnings (as compared to understate earnings). Therefore, we hypothesize that clients of non-Big Six auditors report discretionary accruals that increase income relatively more than the discretionary accruals reported by clients of Big Six auditors. This hypothesis is supported by evidence from a sample of 10,379 Big Six and 2,179 non-Big Six firm years. Specifically, clients of non-Big Six auditors report discretionary accruals that are, on average, 1.5-2.1 percent of total assets higher than the discretionary accruals reported by clients of Big Six auditors. Also, consistent with earnings management, we find that the mean and median of the absolute value of discretionary accruals are greater for firms with non-Big Six auditors. This result also indicates that lower audit quality is associated with more “accounting flexibility”.  相似文献   
993.
The Endogenity of the Optimum Currency Area Criteria   总被引:1,自引:0,他引:1  
A country' suitability for entry into a currency union depends on a number of economic conditions. These include, inter alia , the intensity of trade with other potential members of the currency union, and the extent to which domestic business cycles are correlated with those of the other countries. But international trade patterns and international business cycle correlations are endogenous. This paper develops and investigates the relationship between the two phenomena. Using thirty years of data for twenty industrialised countries, we uncover a strong and striking empirical finding: countries with closer trade links tend to have more tightly correlated business cycles.  相似文献   
994.
Analyzing Real Estate Data Problems Using the Gibbs Sampler   总被引:2,自引:0,他引:2  
Real estate data are often characterized by data irregularities: missing data, censoring or truncation, measurement error, etc. Practitioners often discard missing- or censored-data cases and ignore measurement error. We argue here that an attractive remedy for these irregularity problems is simulation-based model fitting using the Gibbs sampler. The style of the paper is primarily pedagogic, employing a simple illustration to convey the essential ideas, unobscured by implementation complications. Focusing on the missing-data problem, we show dramatic improvement in inference by retaining rather than deleting cases of partially observed data. We also detail Gibbs-sampler usage for other data problems.  相似文献   
995.
Landbouw-tienden     
K. 《De Economist》1856,5(1):368-371
  相似文献   
996.
Roadmapping serves both short and long term (strategic) alignment in science and technology (S&T). Forecasts of the likely future development of S&T are generated; then research and development (R&D) efforts necessary to realize various goals are backcast. But for new and emerging S&T this trusted principle does not work: the likely products are not articulated yet. A promising approach however is building mapping tools based on underlying patterns and indicators of the dynamics of emergence. This paper discusses, based on a first round application in the field of micro and nanotechnologies for single cell analysis, the methodology of such a new approach. The work is linked to a programme of Future oriented Technology Assessment (FTA) activities coordinated within a European nanotechnology research network.

Our paper addresses well-known lacunae of alignment tools from the viewpoints of the path creation/dependency literatures. We then apply these insights to lab-on-a-chip devices for cell analysis. Dynamics of emerging paths can be used to articulate a future structured in terms of prospective innovation chains and potential paradigms. We demonstrate a plausible variety of paths, which provides a broader set of strategic choices. This enables management of expectations and hype by which emerging S&T are characterised, and leads to alignment of actors. Our tool can be applied in strategic management of research and R&D at the level of science-to-industry networks. These are becoming an important element in European S&T policy but will only be successful if ways are found for closing gaps in the innovation chain.  相似文献   

997.
Several efforts have been made since 1980 to estimate the costs and benefits of the European Community's Common Agricultural Policy (CAP). This paper summarises the approach and method adopted in developing one such effort, which aims to provide results at country, commodity and interest group level both for the CAP as a whole, and for changes in it. Economic analysis of the effects of price changes in the CAP is carried out with the use of direct and crossprice elasticities of supply and demand for sixteen major commodities, using base levels of production, consumption, and gross trade flows in each member state, along with rest-of-world data. A number of CAP instruments, such as subsidies, levies, quotas and ‘green’ exchange rates, are built into the calculations and can be varied, along with support prices, to produce new situations in domestic markets and in world price levels. Both financial (budgetary) and welfare (economic surplus) effects of such exogenous price changes can be calculated. Certain policy changes, such as a move to ‘free’ markets, involve endogenous calculation of equilibrium prices. Trend projections subject to a priori constraints are used to produce results for years beyond the extent of data currently available. The types of model run commonly carried out are discussed, along with several strategic judgments that became necessary in carrying out the research. Finally, questions concerning the future development and use of the model are addressed.  相似文献   
998.
999.
1000.
Laboratory incubations with varying O2 and NO3 concentrations were performed with a range of filter materials used in constructed wetlands (CWs). The study included material sampled from functioning CWs as well as raw materials subjected to laboratory pre-incubation. 15N-tracer techniques were used to assess the rates of denitrification versus dissimilatory nitrate reduction to ammonium (DNRA), and the relative role of nitrification versus denitrification in producing N2O. The N2O/(N2 + N2O) product ratio was assessed for the different materials. Sand, shell sand, and peat sustained high rates of denitrification. Raw light-weight aggregates (LWA) had a very low rate, while in LWA sampled from a functioning CW, the rate was similar to the one found in the other materials. The N2O/(N2 + N2O) ratio was very low for sand, shell sand and LWA from functioning CWs, but very high for raw LWA. The ratio was intermediate but variable for peat. The N2O produced by nitrification accounted for a significant percentage of the N2O accumulated during the incubation, but was dependent on the initial oxygen concentration. DNRA was significant only for shell sand taken from a functioning CW, suggesting that the establishment of active DNRA is a slower process than the establishment of a denitrifying flora.  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