全文获取类型
收费全文 | 31136篇 |
免费 | 1084篇 |
国内免费 | 5篇 |
专业分类
财政金融 | 4484篇 |
工业经济 | 1749篇 |
计划管理 | 4497篇 |
经济学 | 6325篇 |
综合类 | 269篇 |
运输经济 | 229篇 |
旅游经济 | 381篇 |
贸易经济 | 4632篇 |
农业经济 | 1239篇 |
经济概况 | 2889篇 |
水利工程 | 5447篇 |
信息产业经济 | 3篇 |
邮电经济 | 81篇 |
出版年
2023年 | 217篇 |
2021年 | 300篇 |
2020年 | 455篇 |
2019年 | 649篇 |
2018年 | 884篇 |
2017年 | 947篇 |
2016年 | 923篇 |
2015年 | 576篇 |
2014年 | 850篇 |
2013年 | 3277篇 |
2012年 | 1315篇 |
2011年 | 1228篇 |
2010年 | 986篇 |
2009年 | 1037篇 |
2008年 | 1060篇 |
2007年 | 1057篇 |
2006年 | 1020篇 |
2005年 | 900篇 |
2004年 | 810篇 |
2003年 | 599篇 |
2002年 | 526篇 |
2001年 | 602篇 |
2000年 | 518篇 |
1999年 | 485篇 |
1998年 | 532篇 |
1997年 | 488篇 |
1996年 | 482篇 |
1995年 | 418篇 |
1994年 | 416篇 |
1993年 | 406篇 |
1992年 | 420篇 |
1991年 | 436篇 |
1990年 | 389篇 |
1989年 | 316篇 |
1988年 | 322篇 |
1987年 | 319篇 |
1986年 | 288篇 |
1985年 | 412篇 |
1984年 | 409篇 |
1983年 | 376篇 |
1982年 | 339篇 |
1981年 | 336篇 |
1980年 | 357篇 |
1979年 | 333篇 |
1978年 | 286篇 |
1977年 | 232篇 |
1976年 | 253篇 |
1975年 | 209篇 |
1974年 | 209篇 |
1973年 | 203篇 |
排序方式: 共有10000条查询结果,搜索用时 968 毫秒
71.
Managing sewerage systems is a highly complex task due to the dynamic nature of the facilities. Their performance strongly depends on the know-how applied by the operators. In order to define optimal operational settings, two decision support tools based on mathematical models have been developed. Moreover, easy-to-use interfaces have been created as well, aiding operators who presumably do not have the necessary skills to use modelling software. The two developed programs simulate the behaviour of both wastewater treatment plants (WWTP) and sewer network systems, respectively. They have essentially the same structure, including raw data management and statistical analysis, a simulation layer using the application programming interface of the applied software and a layer responsible for the representation of the obtained results. Four user modes are provided in the two software including the simulation of historical data using the applied and novel operational settings, as well as modes concerning prediction of possible operation periods and updates. Concerning the WWTP software, it was successfully installed in Nantes (France) in June 2004. Moreover, the one managing sewer networks has been deployed in Saint-Malo (France) in January 2005. This paper presents the structure of the developed software and the first results obtained during the commissioning phase. 相似文献
72.
In rational, efficiently functioning and complete markets, returns on derivative and underlying securities should be perfectly contemporaneously correlated. Due to market imperfections, one of these markets may reflect information faster. The use of high-frequency data and the choice for a small unit time interval to measure these lead-lag relations comes at the cost of some or many missing observations, causing traditional estimators to either under- or overestimate covariances and correlations. We use a new estimator to estimate lead-lag relationships between the cash AEX index, options and futures. We find that futures returns lead both options and cash index returns by approximately 10 minutes. The relationship between options and the cash market is not completely unidirectional. 相似文献
73.
74.
Donna M. Randall 《Journal of Business Ethics》1994,13(5):369-378
Despite the prevalence of elective business ethics courses, little research has sought to explain and predict why some students enroll in these courses and while others do not. Using the theory of planned behavior (Ajzen and Madden, 1986) as a theoretical foundation, 178 graduate students in Ireland were surveyed about their intention to sign up for an elective ethics class. Their behavior was measured two months later. The results reveal the power of the theory of planned behavior to explain and predict who takes elective ethics classes.Donna M. Randall is an associate professor and chair in the Department of Management and Systems at Washington State University. Her research interests include business ethics, organizational commitment, and reproductive risk in the work place. Her work has appeared inJournal of Business Ethics, Decision Sciences, Academy of Management Review, Journal of Vocational Behavior, Journal of Business Research, and others. 相似文献
75.
Objections to the teaching of business ethics 总被引:1,自引:0,他引:1
76.
77.
Asses prices and investment were unusually weak throughout theindustrial world during the early 1990s. This paper highlightsthis stylized fact, and connects it with another: in most ofthe industrial world, asset markets boomed for several yearsbefore collapsing around 1989. The paper suggests that assetmarket bubbles during the late 1980s may have left the industrialworld with an 'asset market hangover' in the early 1990s, inthe form of sluggish asset markets and investment. Empiricalsupport for this hypothesis is provided based on cross-countrydata for equity and real estate markets in most industrial countries.We suggest that financial market developments not justifiedby fundamentals can substantially affect real activity. 相似文献
78.
79.
Josep M. Fradera 《Australian economic history review》2004,44(3):307-320
This article surveys recent research of the Spanish colonial era in the Philippines since the late eighteenth century. While highlighting imperfections in our understanding, the article establishes the parameters with which the Philippine economy entered the twentieth century. It outlines the intensification of Spanish colonial rule through changes in the taxation system, particularly the expansion of forced tobacco cultivation until its abolition in 1882. Since then, the Spanish set out to further change and intensify colonial rule but contradictions in the system of colonial rule caused the effort to come to an abrupt end in 1898. 相似文献
80.