全文获取类型
| 收费全文 | 998篇 |
| 免费 | 38篇 |
专业分类
| 财政金融 | 49篇 |
| 工业经济 | 68篇 |
| 计划管理 | 235篇 |
| 经济学 | 159篇 |
| 综合类 | 79篇 |
| 运输经济 | 37篇 |
| 旅游经济 | 60篇 |
| 贸易经济 | 245篇 |
| 农业经济 | 55篇 |
| 经济概况 | 49篇 |
出版年
| 2025年 | 2篇 |
| 2024年 | 19篇 |
| 2023年 | 41篇 |
| 2022年 | 25篇 |
| 2021年 | 38篇 |
| 2020年 | 72篇 |
| 2019年 | 65篇 |
| 2018年 | 45篇 |
| 2017年 | 44篇 |
| 2016年 | 58篇 |
| 2015年 | 35篇 |
| 2014年 | 74篇 |
| 2013年 | 123篇 |
| 2012年 | 70篇 |
| 2011年 | 46篇 |
| 2010年 | 39篇 |
| 2009年 | 35篇 |
| 2008年 | 33篇 |
| 2007年 | 38篇 |
| 2006年 | 21篇 |
| 2005年 | 23篇 |
| 2004年 | 20篇 |
| 2003年 | 23篇 |
| 2002年 | 13篇 |
| 2001年 | 10篇 |
| 2000年 | 6篇 |
| 1999年 | 8篇 |
| 1997年 | 2篇 |
| 1996年 | 2篇 |
| 1995年 | 2篇 |
| 1994年 | 1篇 |
| 1991年 | 1篇 |
| 1990年 | 2篇 |
排序方式： 共有1036条查询结果，搜索用时 15 毫秒
31.
现代远程教育挑战传统教育 总被引：3，自引：1，他引：3
介绍了远程教育的特点、国外远程教育的现状、我国远程教育面临的问题、传统教育面对挑战所做出的积极反应并阐述了远程教育的发展前景。 相似文献
32.
This paper presents a careful investigation of the three popular calibration weighting methods: (i) generalised regression; (ii) generalised exponential tilting and (iii) generalised pseudo empirical likelihood, with a major focus on computational aspects of the methods and some empirical evidences on calibrated weights. We also propose a simple weight trimming method for range‐restricted calibration. The finite sample behaviour of the weights obtained by the three calibration weighting methods and the effectiveness of the proposed weight trimming method are examined through limited simulation studies. 相似文献
33.
Jos L. T. Blank 《Journal of Productivity Analysis》2009,31(1):27-32
In many public service industries, firms are constrained by a cost (budget) and characterized by non-maximizing output behavior,
due to bureaucratic behavior, for instance. This paper proposes a model based on the assumption that firms with a cost constraint
do not maximize service levels due to resource preferences. It derives the exact relationships between services delivered,
(shadow) input prices, cost constraints, and optimal input quantities. From these relationships, allocative efficiencies,
technical efficiencies, output ray elasticities, and marginal cost can easily be derived.
相似文献
34.
This paper considers semiparametric efficient estimation of conditional moment models with possibly nonsmooth residuals in unknown parametric components (θ) and unknown functions (h) of endogenous variables. We show that: (1) the penalized sieve minimum distance (PSMD) estimator can simultaneously achieve root-n asymptotic normality of and nonparametric optimal convergence rate of , allowing for noncompact function parameter spaces; (2) a simple weighted bootstrap procedure consistently estimates the limiting distribution of the PSMD ; (3) the semiparametric efficiency bound formula of [Ai, C., Chen, X., 2003. Efficient estimation of models with conditional moment restrictions containing unknown functions. Econometrica, 71, 1795–1843] remains valid for conditional models with nonsmooth residuals, and the optimally weighted PSMD estimator achieves the bound; (4) the centered, profiled optimally weighted PSMD criterion is asymptotically chi-square distributed. We illustrate our theories using a partially linear quantile instrumental variables (IV) regression, a Monte Carlo study, and an empirical estimation of the shape-invariant quantile IV Engel curves. 相似文献
35.
风扇是大众电器,技术的发展,风扇的功能日趋多元,各种新型风扇相继问世。然而,却鲜有商家在设计产品时考虑到风扇的使用安全问题。本论文将介绍一种基于单片机的幼儿防触风扇系统,设计通过检测接近物的实时距离来控制电风扇的启停。系统主要选用STC89C52单片机作为控制中心,HC-SR04超声波传感器检测实时距离,液晶屏显示实时距离,红外遥控实现风扇手动启停,蜂鸣器实现报警。风扇开启后,超声波传感器对接近物进行实时距离检测,如果接近物与风扇的距离小于安全距离,蜂鸣器报警,风扇停止运行,5秒后,如果接近物离开,风扇重新运转;如果物体仍然在安全距离外,风扇依旧停止,蜂鸣器报警。 相似文献
36.
Two methods of aggregating Luenberger productivity indicators across firms are considered. One method makes use of some rather implausible allocative efficiency assumptions. The second method, a superlative index number approach, relies on more palatable assumptions and is judged to be the more promising of the two methods. 相似文献
37.
38.
Ying Wang Zhiyong Yang Mahmut Yasar 《Canadian Journal of Administrative Sciences / Revue Canadienne des Sciences de lu0027Administration》2020,37(4):495-512
Previous research shows mixed findings about how cultural distance may affect bilateral trade. To reconcile the mixed findings, we examine how key moderators at both the country-pair level (product type) and the country level (uncertainty avoidance) affect the magnitude of the effect of cultural distance on bilateral trade. Using trade data on electronic products from 90 nations during 2008–2 014, we show that cultural distance in general has a negative impact on bilateral trade. However, the effect is more pronounced when the trade is on experience (versus search) products, or if the importing country is low (versus high) in uncertainty avoidance. Apart from its moderating effect, experience (versus search) product also has a negative main effect on bilateral trade, but its impact is stronger for countries low (versus high) in uncertainty avoidance. 相似文献
39.
Scientifically judging and comparing different mobile e-commerce retailing applications (apps) are essential to increase online shopping efficiency and enhance design for system improvement. In this research, the use of mobile apps in e-commerce retailing is viewed as an information operation process, and distance of information-state transition (DIT) theory is introduced to measure the “convenience” of mobile apps to obtain service information. Thus, a novel DIT-based evaluation method for the ease of use of mobile apps in e-commerce retailing from the perspective of consumer online shopping behaviour patterns is proposed. Three representative Chinese enterprises, namely, Tianmao Mall, Jingdong Mall and Suning Easy-to-buy, are chosen as study objects. Moreover, the corresponding ease-of-use indicators of three mobile apps under typical online shopping behaviour patterns are evaluated quantitatively. Results show that this research has important implications not only for online consumers but also for designers of online shopping systems. 相似文献
40.
《Journal of Education for Business》2012,87(4):223-233
Student knowledge sharing and conversation theory interactions were coded from asynchronous discussion forums to measure the effect of learning-oriented utterances on academic performance. The sample was 3 terms of an online business course (in an accredited MBA program) at a U.S.-based university. Correlation, stepwise regression, and multiple least squares regression were used to create a statistically significant model with 4 interaction factors that captured 89% of adjusted variance effect on grade. Although factor multicollinearity was excessive, the model supported a hypothesis that more student interaction in all 4 discussion forums predicted a higher grade. Certain types of asynchronous forums presented negative factor coefficients, which implied too much interaction may be counterproductive (cognitive load theory or the law of diminishing returns). 相似文献