全文获取类型
收费全文 | 11761篇 |
免费 | 224篇 |
国内免费 | 2篇 |
专业分类
财政金融 | 2299篇 |
工业经济 | 724篇 |
计划管理 | 2046篇 |
经济学 | 2362篇 |
综合类 | 127篇 |
运输经济 | 68篇 |
旅游经济 | 190篇 |
贸易经济 | 2313篇 |
农业经济 | 349篇 |
经济概况 | 1362篇 |
邮电经济 | 147篇 |
出版年
2021年 | 80篇 |
2020年 | 122篇 |
2019年 | 167篇 |
2018年 | 311篇 |
2017年 | 314篇 |
2016年 | 311篇 |
2015年 | 213篇 |
2014年 | 276篇 |
2013年 | 1302篇 |
2012年 | 411篇 |
2011年 | 375篇 |
2010年 | 361篇 |
2009年 | 340篇 |
2008年 | 351篇 |
2007年 | 261篇 |
2006年 | 292篇 |
2005年 | 283篇 |
2004年 | 225篇 |
2003年 | 230篇 |
2002年 | 245篇 |
2001年 | 227篇 |
2000年 | 202篇 |
1999年 | 179篇 |
1998年 | 195篇 |
1997年 | 184篇 |
1996年 | 175篇 |
1995年 | 143篇 |
1994年 | 139篇 |
1993年 | 171篇 |
1992年 | 178篇 |
1991年 | 170篇 |
1990年 | 136篇 |
1989年 | 130篇 |
1988年 | 114篇 |
1987年 | 134篇 |
1986年 | 139篇 |
1985年 | 189篇 |
1984年 | 158篇 |
1983年 | 185篇 |
1982年 | 158篇 |
1981年 | 145篇 |
1980年 | 156篇 |
1979年 | 137篇 |
1978年 | 111篇 |
1977年 | 124篇 |
1976年 | 121篇 |
1975年 | 121篇 |
1974年 | 107篇 |
1973年 | 89篇 |
1971年 | 83篇 |
排序方式: 共有10000条查询结果,搜索用时 13 毫秒
1.
Eric F. Parkinson 《International Journal of Technology and Design Education》2004,14(3):219-243
Construction kits have played a significant part in nurturing the growth and development of the minds and manipulation-based
skills of children (and adults) in formal and non-formal education settings. These kits have origins rooted in the representation
of the built world and now have a diversity of form and function, including technical versions with moving parts. This article
examines some of the historically based ideas that lie behind the role that kits may have in terms of physical modelling.
The article traces the transformation of kits from simple bricks and blocks into more complicated pieces for space-filling
and achieving the transfer of forces and motion. This transformation occurred during the Victorian era when the influence
of the ideas of educationalists and, perhaps rather strangely, exponents of early aviation, played major roles in determining
the diversity of forms of construction kit and modelled possibilities that are now to be seen in classrooms and homes. The
article ends with a review of some of the lessons from the past and present that will need to be considered in relation to
concrete modelling in schools for the future.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
2.
FDI facilitated by agglomeration economies: evidence from manufacturing and services joint ventures in China 总被引:4,自引:0,他引:4
The open door policy of China’s economic reform since the 1980s has attracted heavy foreign direct investment (FDI) flows into China and especially to Guangdong (particularly the Pearl River Delta region, PRD) and induced significant economic growth during the past two decades. While there exist various classical theories of FDI in attempting to identify the determinants of FDI inflow and to explain the behavior of FDI flows, limited attention has been given from the perspective of agglomeration effects generated by a core-periphery (CP) relation.This paper intends to study the impacts of agglomerations on FDI inflows in the context of Krugman’s CP relation (1991) by investigating (1) the formation of a CP relation via gravity model analysis; (2) whether different types of industry FDI flows will respond differently in the CP-system, given agglomeration effects; and (3) whether FDI origin and firm scale matter in affecting FDI flows.A database consisting of a population frame of 37,742 firm-level manufacturing and services joint ventures investing in Guangdong in 1998 was used. Empirical results show that the agglomerations of the CP relation have affected FDI flow patterns. While both manufacturing and services FDI and sources of investment responded differently to the impacts, smaller firms were found more responsive to the CP-agglomeration settings regardless of FDI by industry type and by source. The significance and implications of the CP-system to further facilitate FDI in the region are discussed. 相似文献
3.
4.
We study the optimal investment and consumption problem of a CRRA investor when the drift and volatility of the stock are driven by a correlated factor. The myopic and non‐myopic components of the optimal portfolio process are characterised in terms of the market price of traded and non‐traded risk of the minimax martingale measure. We find that the optimal policies depend crucially on the nature of the agent, aggressive versus conservative, and the market incompleteness, improving versus deteriorating investment opportunities. Furthermore, we show that the original problem cannot be decomposed into a pure consumption and a pure terminal wealth problem, unless the market is complete. 相似文献
5.
Keith H. Coble Thomas O. Knight George F. Patrick & Alan E. Baquet 《Review of Agricultural Economics》2002,24(2):309-321
A survey conducted in Mississippi, Texas, Indiana, and Nebraska elicited producers' preferences for various farm policy changes. This permitted examination of the diversity of preferences that single-state studies have not allowed. Five policy choices, including deficiency payments, loan programs, crop insurance, export programs, and disaster payments were examined. Logit model results predicting producer preferences for each of the five dichotomous policy choices are reported. Explanatory variables based on expected utility theory such as risk aversion, price and yield variability, and price–yield correlation are significant in various models. 相似文献
6.
Rolf Brühl Nils Horch und Mathias Orth 《Zeitschrift für Planung & Unternehmenssteuerung》2008,19(3):299-323
Zusammenfassung Die Bildung von Forschungshypothesen ist zwar immer ein kreativer, sollte aber gleichzeitig kein unsystematischer
Prozess sein. Im vorliegenden Artikel liegt der Fokus auf der Methodenunterstützung des Entdeckungszusammenhangs.
Die Methode der Grounded Theory bietet einen Bezugsrahmen für qualitative empirische Studien, mit dem
Theorien entwickelt werden, die aus dem Textmaterial zu begründen sind. Eine Literaturanalyse verdeutlicht,
dass das Potenzial dieser Methode bisher in der Controlling- und Rechnungswesenforschung weitgehend ungenutzt
bleibt. Anhand einer Diskussion empirischer Studien, welche auf die Methode zurückgreifen, werden
Anwendungsm?glichkeiten der Grounded Theory für diese Disziplinen aufgezeigt.
Summary Creating research hypotheses is always a creative but not necessarily an unsystematic process. In our study we introduce a method supporting the logic of discovery. The grounded theory approach provides a framework for a systematic development of theories emerging from empirical data. A literature review stresses that the potential of the method so far is unused in accounting research. The grounded theory approach is introduced to support empirical work within this research field. Options for an application of the method in accounting research are shown by the means of a discussion of empirical studies. Furthermore the reader gets hints for reference studies.相似文献
7.
The economics of land transfer and title insurance 总被引:3,自引:0,他引:3
In the presence of uncertainty over the title of land (due to fraud or error), a legal system can protect either the current (innocent) owner, or a previous owner who claims title. The predominant system in the United States generally awards title to the latter in the event of legitimate claim. Thus, current owners frequently purchase title insurance to provide indemnification in the event of a loss. In contrast, the Torrens system awards title to the current owner, but provides for indemnification of any legitimate claimants. We evaluate these two systems and argue that if transaction costs are low, both promote efficient assignment of title (according to the Coase Theorem), but if transaction costs are high, the Torrens system is more likely to award title to the party that values it the most (namely, the current possessor). 相似文献
8.
9.
In this paper we offer a method for deciding how to aggregate a set of elementary industries. The method is then applied to the problem of estimating a wage equation that allows for industry-specific effects. Our method explicitly formalizes the trade-off between goodness-of-fit and parsimony implicit in an aggregation problem. By varying the parameter of the assumed loss function, one obtains a whole sequence of aggregation levels. Further, the resulting sequence is consistent; that is, groupings formed at one level of aggregation will never be undone when one aggregates further. 相似文献
10.
We examine the role of index futures trading in spot market volatility. We use the exponential generalized autoregressive conditional heteroskedasticity (EGARCH) approach to measure volatility, analyze causality and feedback relations between volatilities in the spot and futures markets, and test various hypotheses in the context of a multivariate model that incorporates other macrostate variables. Our empirical results suggest index futures trading may not be blamed for the observed volatility in the spot market. Rather, we find stronger and more consistent support for the alternative posture that volatility in the futures market is an outgrowth of a turbulent cash market. We use the regret (cognitive dissonance) theory to explain our results. 相似文献