全文获取类型
收费全文 | 19806篇 |
免费 | 535篇 |
专业分类
财政金融 | 3632篇 |
工业经济 | 1597篇 |
计划管理 | 3444篇 |
经济学 | 4582篇 |
综合类 | 248篇 |
运输经济 | 132篇 |
旅游经济 | 276篇 |
贸易经济 | 2919篇 |
农业经济 | 940篇 |
经济概况 | 2493篇 |
信息产业经济 | 1篇 |
邮电经济 | 77篇 |
出版年
2021年 | 123篇 |
2020年 | 220篇 |
2019年 | 350篇 |
2018年 | 375篇 |
2017年 | 445篇 |
2016年 | 442篇 |
2015年 | 263篇 |
2014年 | 439篇 |
2013年 | 1907篇 |
2012年 | 573篇 |
2011年 | 636篇 |
2010年 | 529篇 |
2009年 | 649篇 |
2008年 | 552篇 |
2007年 | 498篇 |
2006年 | 450篇 |
2005年 | 415篇 |
2004年 | 383篇 |
2003年 | 419篇 |
2002年 | 404篇 |
2001年 | 395篇 |
2000年 | 438篇 |
1999年 | 406篇 |
1998年 | 384篇 |
1997年 | 384篇 |
1996年 | 377篇 |
1995年 | 316篇 |
1994年 | 309篇 |
1993年 | 355篇 |
1992年 | 359篇 |
1991年 | 352篇 |
1990年 | 342篇 |
1989年 | 275篇 |
1988年 | 257篇 |
1987年 | 263篇 |
1986年 | 287篇 |
1985年 | 379篇 |
1984年 | 321篇 |
1983年 | 299篇 |
1982年 | 265篇 |
1981年 | 300篇 |
1980年 | 265篇 |
1979年 | 293篇 |
1978年 | 258篇 |
1977年 | 197篇 |
1976年 | 198篇 |
1975年 | 148篇 |
1974年 | 149篇 |
1973年 | 163篇 |
1972年 | 127篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
In this paper, we focus on the question to what extent machine learning (ML) tools can be used to support systematic literature reviews. We apply a ML approach for topic detection to analyze emerging topics in the literature—our context is accounting and finance research in the Asia–Pacific region. To evaluate the robustness of the approach, we compare findings from the automated ML approach with the results from a manual analysis of the literature. The automated approach uses a keyword algorithm detection mechanism whereby the manual analysis uses common techniques for qualitative data analysis, that is, triangulation between researchers (expert judgement). From our paper, we conclude that both methods have strengths and weaknesses. The automated analysis works well for large corpora of text and provides a very standardized and non-biased way of analyzing the literature. However, the human researcher is potentially better equipped to evaluate current issues and future trends in the literature. Overall, the best results might be achieved when a variety of tools are used together. 相似文献
22.
23.
This study explores relationships between race, gender, agreeableness, openness to experience, contact, and a measure of attitudes toward diversity—universal‐diverse orientation (UDO). UDO consists of three attitudinal components: realistic appreciation (a cognition), comfort with difference (a feeling), and diversity of contact (a behavior). Results suggest that race, agreeableness, and openness relate to UDO attitudes, primarily due to the relationships of these variables with the behavioral component—diversity of contact. Identifying characteristics of tolerant people (e.g., agreeableness) and training managers in skills related to those characteristics may improve contextual performance and make managers better role models within the organizational context. © 2003 Wiley Periodicals, Inc. 相似文献
24.
Germano Mwabu Mwangi S. Kimenyi Paul K. Kimalu Nancy Nafula Damiano Kulundu Manda 《Revue africaine de developpement》2003,15(1):77-85
Household surveys provide data that is used for identifying and measuring the poverty status of households and individuals. However, carrying out such surveys is expensive, especially in poor developing countries. Thus it is important to make maximum use of the available survey data in developing countries, especially in sub‐Saharan Africa, where such data are expensive to collect and analyse. This paper develops a simple method for using poverty indices derived from survey data for a given year, to predict poverty rates for subsequent periods without having to conduct a new household survey. We illustrate the workings of the method with data from Kenyan household surveys for 1994 and 1997. 相似文献
25.
The Local Whittle Estimator of Long-Memory Stochastic Volatility 总被引:1,自引:0,他引:1
We propose a new semiparametric estimator of the degree of persistencein volatility for long memory stochastic volatility (LMSV) models.The estimator uses the periodogram of the log squared returnsin a local Whittle criterion which explicitly accounts for thenoise term in the LMSV model. Finite-sample and asymptotic standarderrors for the estimator are provided. An extensive simulationstudy reveals that the local Whittle estimator is much lessbiased and that the finite-sample standard errors yield moreaccurate confidence intervals than the widely-used GPH estimator.The estimator is also found to be robust against possible leverageeffects. In an empirical analysis of the daily Deutsche Mark/USDollar exchange rate, the new estimator indicates stronger persistencein volatility than the GPH estimator, provided that a largenumber of frequencies is used. 相似文献
26.
27.
28.
L. Zhang Simon X. B. Zhao J. P. Tian 《International journal of urban and regional research》2003,27(4):912-937
This article focuses on the housing issues of rural migrants arising from urbanization, with particular reference to chengzhongcun, a topic with considerable impact on policymaking. An attempt is made to understand the underlying rationale of self‐help in housing and the important role of chengzhongcun in sheltering rural migrants in the context of China's rural‐urban dichotomy. As demonstrated in this study, chengzhongcun accommodate, with little in the way of government resources and assistance, millions of rural migrants because of their social accessibility and affordability. While not denying their social problems, we argue that chengzhongcun in fact act as an innovative and positive agent to promote urbanization in present day China by housing massive numbers of rural migrants and assimilating them into cities. Current government policies towards chengzhongcun have generated a wide range of interest conflicts and confrontations. The consequences of such conflicts show that the government policies were problematic and unworkable, as they violated basic market principles as well as citizen rights. Policy strategy towards the redevelopment of chengzhongcun must acknowledge their credibility in the Chinese road to urbanization and requires more thoughtful and prudent consideration of migrants' demands for affordable housing. 相似文献
29.
We consider the problem of estimating a probability density function based on data that are corrupted by noise from a uniform distribution. The (nonparametric) maximum likelihood estimator for the corresponding distribution function is well defined. For the density function this is not the case. We study two nonparametric estimators for this density. The first is a type of kernel density estimate based on the empirical distribution function of the observable data. The second is a kernel density estimate based on the MLE of the distribution function of the unobservable (uncorrupted) data. 相似文献
30.
Jonathan P. O'Brien 《战略管理杂志》2003,24(5):415-431
In this paper, we argue that consideration of firm strategy can help illuminate the choices managers make between debt and equity financing. Within an industry, the form of competition that each firm chooses will determine the strategic value to the firm of maintaining financial slack. Our empirical analysis yields strong support for the proposition that financial slack should be a particularly critical strategic imperative for firms pursuing a competitive strategy premised on innovation. We also demonstrate that firms pursuing such a strategy that fail to recognize the value of financial slack are likely to perform poorly. Copyright © 2003 John Wiley & Sons, Ltd. 相似文献