全文获取类型
收费全文 | 27625篇 |
免费 | 527篇 |
专业分类
财政金融 | 5358篇 |
工业经济 | 2229篇 |
计划管理 | 4448篇 |
经济学 | 5909篇 |
综合类 | 635篇 |
运输经济 | 196篇 |
旅游经济 | 450篇 |
贸易经济 | 4033篇 |
农业经济 | 1304篇 |
经济概况 | 3576篇 |
信息产业经济 | 1篇 |
邮电经济 | 13篇 |
出版年
2021年 | 167篇 |
2020年 | 306篇 |
2019年 | 410篇 |
2018年 | 523篇 |
2017年 | 532篇 |
2016年 | 481篇 |
2015年 | 355篇 |
2014年 | 573篇 |
2013年 | 2845篇 |
2012年 | 745篇 |
2011年 | 828篇 |
2010年 | 760篇 |
2009年 | 823篇 |
2008年 | 795篇 |
2007年 | 668篇 |
2006年 | 569篇 |
2005年 | 505篇 |
2004年 | 531篇 |
2003年 | 539篇 |
2002年 | 527篇 |
2001年 | 544篇 |
2000年 | 620篇 |
1999年 | 506篇 |
1998年 | 503篇 |
1997年 | 524篇 |
1996年 | 470篇 |
1995年 | 444篇 |
1994年 | 444篇 |
1993年 | 524篇 |
1992年 | 480篇 |
1991年 | 466篇 |
1990年 | 431篇 |
1989年 | 386篇 |
1988年 | 370篇 |
1987年 | 340篇 |
1986年 | 383篇 |
1985年 | 515篇 |
1984年 | 545篇 |
1983年 | 507篇 |
1982年 | 457篇 |
1981年 | 458篇 |
1980年 | 449篇 |
1979年 | 426篇 |
1978年 | 357篇 |
1977年 | 341篇 |
1976年 | 302篇 |
1975年 | 256篇 |
1974年 | 237篇 |
1973年 | 223篇 |
1972年 | 161篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
Teaching New Product Development To Employed Adults 总被引:1,自引:0,他引:1
The purpose of this article is to report the lessons derived from broad practical experience in teaching new product development (NPD) to employed adults. My observations are importantly augmented by diverse comments from nine other service providers who also conduct and participate in similar NPD education. Our combined lessons summarize what works and what to be forewarned about. (“Those who cannot remember the past are condemned to repeat it.”– George Santayana.) We believe that what we have learned from our very different and extensive involvement can help several audiences: (1) others who offer or plan to offer and deliver NPD education – educators, service providers, or practitioners; (2) organizations that may wish to sponsor NPD training in any form; and (3) those who expect to participate as students in NPD seminars or courses. The article has four main sections, all of which are intended to provide pointers and helpful suggestions based on our collective experience. First is a discussion of issues concerning program set‐up and acceptance. Both sponsors and participants have important responsibilities for this, which are explained. Second is a discussion of practical issues specific to NPD education. The varieties of subject matter and support materials, format options, techniques to sustain interest, instructor characteristics, and client confidentiality are covered. Third is a discussion of practical logistic issues that apply to all adult education but with an emphasis on NPD. Advance warning of what can be and has been encountered may help you circumvent many avoidable problems. Fourth is a brief discussion about the future for NPD education. In this we speculate that the emergence of broadband Internet may provide a new modality, the effectiveness of which is still uncertain. An important insight for you to note is that we do not always do the same thing or approach teaching situations in the same way. What has worked for one of us may not have been effective for another or in another situation. In summary, the experiences we record should help you improve the delivery of NPD education or more efficiently benefit from participation in such training. © 2002 Elsevier Science Inc. All rights reserved. 相似文献
102.
David C. Hall Thomas O. Knight Keith H. Coble Alan E. Baquet George F. Patrick 《Review of Agricultural Economics》2003,25(2):430-448
Beef cattle producers were surveyed in Texas and Nebraska to investigate perceptions of sources of risk, the effectiveness of risk management strategies, and interest in further risk management education, particularly production risk, using probit analysis. Important decision variables identified are age, prior use of risk management tools, previous attendances of risk management education, and risk aversion. Severe drought and cattle price variability are identified as primary risk factors with potential to affect farm income. Extremely cold weather and disease are of less importance. Understocking pasture and storing hay are perceived most effective as risk management options. 相似文献
103.
This study investigates the intervening effects of budgetary participation and job-relevant information on the relationship between budget emphasis and job satisfaction. It proposes that budgetary participation and job-relevant information are endogenous to budget emphasis. Using the path analytical technique and based on a sample of 152 senior managers, the study found that budget emphasis has an insignificant direct effect on job satisfaction, but a strong indirect effect through job-relevant information and budgetary participation. The results also indicate that job-relevant information has an intervening effect on the relationship between participation and job satisfaction. 相似文献
104.
Predicting the geo-temporal variations of crime and disorder 总被引:2,自引:0,他引:2
Traditional police boundaries—precincts, patrol districts, etc.—often fail to reflect the true distribution of criminal activity and thus do little to assist in the optimal allocation of police resources. This paper introduces methods for crime incident forecasting by focusing upon geographical areas of concern that transcend traditional policing boundaries. The computerised procedure utilises a geographical crime incidence-scanning algorithm to identify clusters with relatively high levels of crime (hot spots). These clusters provide sufficient data for training artificial neural networks (ANNs) capable of modelling trends within them. The approach to ANN specification and estimation is enhanced by application of a novel and noteworthy approach, the Gamma test (GT). 相似文献
105.
Estimating the Size of a Criminal Population from Police Records Using the Truncated Poisson Regression Model 总被引:1,自引:0,他引:1
Peter G.M. van der Heijden Maarten Cruyff Hans C. van Houwelingen 《Statistica Neerlandica》2003,57(3):289-304
The truncated Poisson regression model is used to arrive at point and interval estimates of the size of two offender populations, i.e. drunk drivers and persons who illegally possess firearms. The dependent capture–recapture variables are constructed from Dutch police records and are counts of individual arrests for both violations. The population size estimates are derived assuming that each count is a realization of a Poisson distribution, and that the Poisson parameters are related to covariates through the truncated Poisson regression model. These assumptions are discussed in detail, and the tenability of the second assumption is assessed by evaluating the marginal residuals and performing tests on overdispersion. For the firearms example, the second assumption seems to hold well, but for the drunk drivers example there is some overdispersion. It is concluded that the method is useful, provided it is used with care. 相似文献
106.
This article matches establishment-level data on workplace transformation (e.g., quality circles, work teams, and just-in-time production) with measures of cumulative trauma disorders at these same establishments to explore the relationship between "flexible" workplace practices and workplace health and safety. The results reveal a positive, statistically significant, and quantitatively sizable relationship between cumulative trauma disorders and the use of quality circles and just-in-time production. 相似文献
107.
108.
Steven C. Hall 《Journal of Business Finance & Accounting》1993,20(4):613-621
This study investigates whether economic consequences have an effect on the length of the period over which goodwill is amortized. It finds that there is a significant relationship between the size of the firm and the length of the amortization period. It also finds, when the only firms included in the sample are those reporting debt covenant restrictions dependent in part on goodwill accounting, evidence that the length of the amortization period for goodwill is related to the firm's leverage. 相似文献
109.
Wayne H. Howard Robert W. Blake Thomas O. Knight C. Richard Shumway Michael A. Tomaszewski 《Agricultural Economics》1992,7(1):77-90
A method of combining survey data and Dairy Herd Improvement Association (DHIA) records to achieve low cost farm trials is presented. Farm trials and surveys of current practices and production responses are useful to identify yield gaps between expectations predicted from experimental findings and actual field results. Different management schemes can be ranked using subjective probabilities and stochastic dominance to enhance successful implementation of research findings and to increase the feedback between researchers, extension workers, and producers. A survey of current masitis control practices and expected milk yield response is the example. Combining survey results with DHIA records allowed estimating the relationship between somatic cell counts (SCC) and milk yield. Eliciting beliefs about the relationship between SCC and milk yield showed that producers agreed with predictions from the statistical model. Subjective probabilities about SCC and mastitis control practices showed that our sample of experts and producers consistently ranked the different practices but extension agents had no consensus about the the most or least effective ones. 相似文献
110.
D. P. Kennedy 《Mathematical Finance》1993,3(1):55-63
For a compound Poisson process with negative drift and jump distribution consisting of a mixture of exponentials on [0) and on (-, 0), an exact expression is derived for the probability of hitting the level c, c > 0. the problem is motivated by modeling the returns from trading on financial markets. 相似文献