全文获取类型
收费全文 | 39366篇 |
免费 | 833篇 |
专业分类
财政金融 | 7092篇 |
工业经济 | 3679篇 |
计划管理 | 6674篇 |
经济学 | 8920篇 |
综合类 | 377篇 |
运输经济 | 290篇 |
旅游经济 | 702篇 |
贸易经济 | 5908篇 |
农业经济 | 1884篇 |
经济概况 | 4600篇 |
邮电经济 | 73篇 |
出版年
2021年 | 240篇 |
2020年 | 422篇 |
2019年 | 576篇 |
2018年 | 767篇 |
2017年 | 749篇 |
2016年 | 721篇 |
2015年 | 542篇 |
2014年 | 832篇 |
2013年 | 3843篇 |
2012年 | 1104篇 |
2011年 | 1478篇 |
2010年 | 1197篇 |
2009年 | 1330篇 |
2008年 | 1314篇 |
2007年 | 1179篇 |
2006年 | 1114篇 |
2005年 | 987篇 |
2004年 | 955篇 |
2003年 | 962篇 |
2002年 | 887篇 |
2001年 | 813篇 |
2000年 | 826篇 |
1999年 | 708篇 |
1998年 | 718篇 |
1997年 | 688篇 |
1996年 | 655篇 |
1995年 | 598篇 |
1994年 | 633篇 |
1993年 | 637篇 |
1992年 | 586篇 |
1991年 | 609篇 |
1990年 | 549篇 |
1989年 | 469篇 |
1988年 | 469篇 |
1987年 | 474篇 |
1986年 | 464篇 |
1985年 | 675篇 |
1984年 | 658篇 |
1983年 | 647篇 |
1982年 | 616篇 |
1981年 | 512篇 |
1980年 | 516篇 |
1979年 | 520篇 |
1978年 | 436篇 |
1977年 | 400篇 |
1976年 | 330篇 |
1975年 | 297篇 |
1974年 | 294篇 |
1973年 | 280篇 |
1972年 | 214篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
102.
The emerging concern about software piracy and illegal or unauthorized use of information technology and software has been
evident in the media and open literature for the last few years. In the course of conducting their academic assignments, the
authors began to compare observations from classroom experiences related to ethics in the use of software and information
technology and systems. Qualitatively and anecdotally, it appeared that many if not most, students had misconceptions about
what represented ethical and unethical behaviors in these realms. Clearly, one can argue that if college students are uncertain
about what constitutes appropriate and inappropriate behavior then this uncertainty will be carried forward into their workplaces
upon graduation. Furthermore, if their workplaces don't provide ethics training as a component of a new employee orientation
program, one can project a potential for unintentional violations and infringements of copyrights and law in the field. This
study was conducted among graduate and undergraduate students to gain insight into their attitudes, perceptions and understanding
of some of the relevant ethics issues. A questionnaire of 11 statements was employed that described ubiquitous but most likely
unethical (or surely dubious) behaviors in the prevailing business and academic environments. Each respondent was asked to
evaluate each statement twice (once for “self” and once for “colleague”) on a five-option highly ethical (5) to neutral (3)
to highly unethical (1) scale. The statements were worded such that lower instrument score was associated with higher ethical
responses. The questionnaire's two-part structure was designed to solicit honest answers. The encouraging learning from this
study was that the overall sample and its various sub-samples did not consider any of the eleven behaviors to be “ethical”
or “highly ethical.” It was also encouraging to note that the overall sample and all sub-samples considered “highly unethical”
those behaviors associated with personal privacy or property or outright theft. This indicated that moral judgment and probity
prevail. The discouraging learning was that behaviors associated with the use of enterprise property were viewed as “neutral”
i.e., neither “ethical” nor “unethical.” These findings suggested confusion and lack of clarity and definition around workplace
deportment as it regards ethics in software and information technology use. The current study suggests that additional research
needs to be conducted to define and clarify the issues, which in turn can form the basis for programs to rectify or at least
ameliorate the situation. 相似文献
103.
The Singapore Exchange (SGX), a small satellite market, successfully competes with a large home market, the Osaka Securities Exchange (OSE), in trading the Nikkei 225 futures index. In this paper, we investigate the contribution of the SGX to price discovery and shed light on the reasons for its continued success. Evidence is provided from information revelation and price discovery of three competing but informationally linked markets of the Nikkei 225 index—domestic spot (Tokyo Stock Exchange), domestic futures (OSE), and foreign futures (SGX), which represents the satellite market. Overall, the futures market contributes 77% to price discovery, with the satellite market contributing 42% of the futures and 33% of the total price discovery. These figures, surprisingly, far exceed the satellite market's share of trading volume. Support is provided for the extended trading hours on the SGX for three of the four non‐overlapping trading sub‐periods. © 2004 Wiley Periodicals, Inc. Jrl Fut Mark 24:981–1004, 2004 相似文献
104.
The purpose of this study was to assess the basis behavior of the Live Cattle Futures contract at the Chicago Mercantile Exchange (CME) before and after the 1995 contract changes. Additionally, an alternative method of basis calculation utilizing weighted mean futures prices versus settlement futures prices was compared to determine which method provides a better representation of the basis level. Within a regression model with heteroskedascity error framework, we found that the level of nearby basis in the period after June 1995 has shifted lower and the average monthly open interest of net commercial long positions has substantially increased after the contract modifications. These empirical results are consistent with the notion that more long activity entered the market in response to the contract modifications. Additionally, an alternative (new) measure of basis calculation (cash price minus weighted mean futures price) produced similar results to two other commonly used measures. In conclusion, the 1995 contract changes have neither increased nor decreased the volatility of live cattle basis. © 2004 Wiley Periodicals, Inc. Jrl Fut Mark 24:557–590, 2004 相似文献
105.
Here we consider the hedging roles of a price futures contract versus a revenue futures contract. In the absence of idiosyncratic output risk, the revenue contract almost always dominates the price contract. Idiosyncratic output risk provides conditions under which the price contract should dominate. When production risk is largely idiosyncratic, a producer with an anticipated long actuals position might combine a long revenue futures position with a short price futures position. © 2004 Wiley Periodicals, Inc. Jrl Fut Mark 24:503–512, 2004 相似文献
106.
107.
Explaining Firm Employment Growth: Does Location Matter? 总被引:1,自引:0,他引:1
This paper addresses the question to what extent the location of a firm can be regarded as having an influence on the performance of a firm as measured by employment growth. While in theory it is widely acknowledged that `location' should be considered as a relevant growth determinant, empirical research has so far mainly focused on firm-internal factors. The question raised in this paper is empirically verified by means of an econometric model based on a data set of circa 35,000 establishments located in the northern part of the Netherlands during the period 1994–1999. The model includes several measurements of location characteristics like the population level and growth, employment growth, spatial specialisation and cluster indicators, type of enterprise zone, and accessibility while controlling for firm-associated factors such as size, age, and business activity. Based on the fact that we find several significant coefficients we conclude that `location matters' but that the effect differs by type of economic activity. 相似文献
108.
The purpose of this research was to investigate the effects that user task load level has on the relationship between an individual's trust in and subsequent use of a system's automation. Military decision-makers trust and use information system automation to make many tactical judgments and decisions. In situations of information uncertainty (information warfare environments), decision-makers must remain aware of information reliability issues and temperate their use of system automation if necessary. An individual's task load may have an effect on his use of a system's automation in environments of information uncertainty.It was hypothesized that user task load will have a moderating effect on the positive relationship between system automation trust and use of system automation. Specifically, in situations of information uncertainty (low trust), high task load will have a negative effect on the relationship. To test this hypothesis, an experiment in a simulated command and control micro-world was conducted in which system automation trust and individual task load were manipulated. The findings from the experiment support the positive relationship between automation trust and automation use found in previous research and suggest that task load does have a negative effect on the positive relationship between automation trust and automation use. Experiment participant who incurred a higher task load exhibited an over-reliance on their automated information systems to assist them in their decision-making activities. Such an over-reliance can lead to vulnerabilities of deception and suggests the need for automated deception detection capabilities. 相似文献
109.
THE SQUARED ORNSTEIN-UHLENBECK MARKET 总被引:2,自引:0,他引:2
We study a complete market containing J assets, each asset contributing to the production of a single commodity at a rate that is a solution to the squared Ornstein-Uhlenbeck (Cox-Ingersoll-Ross) SDE. The assets are owned by K agents with CRRA utility functions, who follow feasible consumption/investment regimes so as to maximize their expected time-additive utility from consumption. We compute the equilibrium for this economy and determine the state-price density process from market clearing. Reducing to a single (representative) agent, and exploiting the relation between the squared-OU and squared-Bessel SDEs, we obtain closed-form expressions for the values of bonds, assets, and options on the total asset value. Typical model parameters are estimated by fitting bond price data, and we use these parameters to price the assets and options numerically. Implications for the total asset price itself as a diffusion are discussed. We also estimate implied volatility surfaces for options and bond yields. 相似文献
110.