全文获取类型
收费全文 | 43553篇 |
免费 | 528篇 |
国内免费 | 3篇 |
专业分类
财政金融 | 6084篇 |
工业经济 | 2581篇 |
计划管理 | 8069篇 |
经济学 | 9081篇 |
综合类 | 2564篇 |
运输经济 | 123篇 |
旅游经济 | 144篇 |
贸易经济 | 7501篇 |
农业经济 | 1689篇 |
经济概况 | 5529篇 |
信息产业经济 | 61篇 |
邮电经济 | 658篇 |
出版年
2024年 | 50篇 |
2023年 | 226篇 |
2022年 | 452篇 |
2021年 | 622篇 |
2020年 | 696篇 |
2019年 | 458篇 |
2018年 | 2746篇 |
2017年 | 2801篇 |
2016年 | 1802篇 |
2015年 | 720篇 |
2014年 | 853篇 |
2013年 | 1480篇 |
2012年 | 2494篇 |
2011年 | 5115篇 |
2010年 | 4631篇 |
2009年 | 3261篇 |
2008年 | 3427篇 |
2007年 | 3566篇 |
2006年 | 1915篇 |
2005年 | 2091篇 |
2004年 | 1026篇 |
2003年 | 1072篇 |
2002年 | 698篇 |
2001年 | 472篇 |
2000年 | 267篇 |
1999年 | 171篇 |
1998年 | 146篇 |
1997年 | 113篇 |
1996年 | 91篇 |
1995年 | 44篇 |
1994年 | 37篇 |
1993年 | 69篇 |
1992年 | 40篇 |
1991年 | 31篇 |
1990年 | 35篇 |
1989年 | 26篇 |
1988年 | 18篇 |
1986年 | 22篇 |
1985年 | 20篇 |
1984年 | 39篇 |
1983年 | 20篇 |
1982年 | 15篇 |
1981年 | 24篇 |
1980年 | 17篇 |
1979年 | 15篇 |
1978年 | 11篇 |
1977年 | 24篇 |
1976年 | 13篇 |
1975年 | 10篇 |
1973年 | 10篇 |
排序方式: 共有10000条查询结果,搜索用时 484 毫秒
991.
Alvaro J. Name-Correa 《Review of Economic Design》2017,21(4):291-316
From experience, fund-raisers become more efficient solicitors. This paper offers a full characterization of the optimal solicitation strategy when there are learning economies. The characterization is recursive, and does not require equilibrium computations. Our main results are that (1) the fund-raiser may now solicit a “ net free-rider”—a donor whose contribution falls below the marginal solicitation cost; (2) the number of solicitations is non-monotonic in the learning rate; and (3) a solicitation technology with high overhead but low marginal costs is likely to be optimal if income distribution in the population is relatively homogenous. The complementary case with a decreasing returns to scale technology is also considered. 相似文献
992.
993.
In recent years, a growing number of small-to-medium-enterprises are embracing wind turbine projects not only as part of their cost reduction strategy but also to actively play their part in the global fight against climate change. However, it would appear there are currently limited empirical studies carried out in this emerging industry. This case study analyses the cost effectiveness of one such wind turbine initiative by a company in the Republic of Ireland, who invested in a 300 kW embedded wind turbine project at the end of 2013. The research methodology which is primarily a case study analysis included comparing historical electricity utility bills which allowed the 2013 quantity of electrical energy units imported, i.e. the year before the turbine was installed to be compared with the 2014 value, i.e. the year after the turbine was installed. Numerous site visits were undertaken over a four-year period, during which electric meter readings were recorded and stored. The findings of this piece of research indicate that the installation of the embedded wind turbine had minimal positive effect on the annual electricity costs for the company. Indeed the turbine appears to have significant negative effects such as a need for an increased maximum import capacity and also it appeared to contribute to a deteriorating utility power factor. While the aesthetic nature of the on-site turbine seemed to create a positive image of the company, it would appear that caution should be exercised when business owners select alternative energy providers who claim to be experts in the energy field but may have limited knowledge in this area of wind energy, which as of yet has minimal robust research into all aspects of its benefits/attributes. 相似文献
994.
I. M. Aizinova 《Studies on Russian Economic Development》2017,28(4):450-457
The first part of this published paper has provided a brief assessment of the demographic situation in the world and considers the problems of the health protection of elderly age groups and ensuring of their level of income and material well-being through the state pension system and their own work activities, as well as measures for protecting the interests of elderly people in the consumer sector. The shortcomings of the adopted strategy of action for the benefit of the older generation in the Russian Federation until 2025 have been discussed. The second part of this article will be be published in a forthcoming issue of this journal. 相似文献
995.
Salim Lahmiri Stelios Bekiros Anastasia Giakoumelou Frank Bezzina 《International Journal of Intelligent Systems in Accounting, Finance & Management》2020,27(1):3-9
Financial data classification plays an important role in investment and banking industry with the purpose to control default risk, improve cash and select the best customers. Ensemble learning and classification systems are becoming gradually more applied to classify financial data where outputs from different classification systems are combined. The objective of this research is to assess the relative performance of existing state‐of‐the‐art ensemble learning and classification systems with applications to corporate bankruptcy prediction and credit scoring. The considered ensemble systems include AdaBoost, LogitBoost, RUSBoost, subspace, and bagging ensemble system. The experimental results from three datasets: one is composed of quantitative attributes, one encompasses qualitative data, and another one combines both quantitative and qualitative attributes. By using ten‐fold cross‐validation method, the experimental results show that AdaBoost is effective in terms of low classification error, limited complexity, and short time processing of the data. In addition, the experimental results show that ensemble classification systems outperform existing models that were recently validated on the same databases. Therefore, ensemble classification system can be employed to increase the reliability and consistency of financial data classification task. 相似文献
996.
This research introduces the multi-product capacitated facility location problem with general production and building costs (MP-CFLPGC). The MP-CFLPGC extends previous problems found in the literature by including multiple products and general production and building cost functions that allow the modeling of different behaviors like economies of scale and congestion. The MP-CFLPGC is formulated as a mixed integer linear program (MILP). To evaluate the performance of the proposed formulation we analyze the results of a commercial optimizer on a set of 288 randomly generated test instances that resemble the Colombian cement industry supply chain. After one hour the optimizer achieved an optimality gap of 1.0 % or less in 55 % out of the 288 test instances. On average the optimality gap was 3.57 %. Additionally, we propose a randomized mathematical-programming-based heuristic for the test instances where the MILP formulation presents significantly high optimality gaps. 相似文献
997.
S. V. Kiselev A. S. Strokov A. Yu. Belugin 《Studies on Russian Economic Development》2016,27(5):548-556
This paper analyzes the possible impact of irrigation on the development of agriculture in the Volga River Basin and Black Sea Basin. Scenarios of the development of agriculture in Russia up to 2030 under the conditions of the expansion of irrigation and persistence of the current situation with irrigation have been calculated and analyzed based on the IMPACT-3 econometric partial equilibrium model. 相似文献
998.
The purpose of this paper is to empirically explore two dimensions of the firm hierarchy of international market-specific linkages, using data on Swedish manufacturing firms from 1997 to 2007. First, we investigate the productivity ordering with respect to three international linkages; importing, exporting and investing abroad. Second, we explore whether differences in the productivity ordering across industries correlates with industry and country characteristics. Our findings support a general productivity hierarchy from importing to exporting and from exporting to investing abroad, as well as from a low to a high number of linkages (measuring the complexity of firms’ international linkages). However, an industry-by-industry examination shows that the hierarchical structure is only generally upheld when it comes to the number of international linkages, while the ordering of import, export and investment linkages does not exhibit the same regularity across industries. Extending the analysis, we find that the lack of a hierarchical structure is more likely in industries focusing on larger and less distant markets. 相似文献
999.
Pierluigi Sabbatini 《Journal of Industry, Competition and Trade》2016,16(3):345-371
It is hard to assess the coordinated effect of mergers in solid and convincing fashion, in part because economic theory deals mainly with the sustainability of tacit collusion and generally does not explore the conditions that foster collusion in the first place. Also the most popular schemes of collusion (Joint profit maximization and Nash Bargaining) proposed by the economic literature seem at odds with the evidence recorded on cartels and with the practical attitude of entrepreneurs. In this scenario the recent version of the Horizontal Merger Guidelines contained the interesting suggestion to pay attention to the process - parallel behaviour – which leads to collusive equilibria. Working on the same intuition we propose an approach based on the idea that firms can always find a feasible collusive agreement, for every possible value of the factor which discounts future profits. Assuming that in order to collude, firms demand the fair sharing of collusive gains, we exploit the egalitarian property of grim trigger strategies when all incentive compatibility constraints are binding. This approach suggests using three indicators to determine whether and how a merger affects the probability of collusion. An application of this approach to a real-world case (the AT&T/T-Mobile merger) is provided. 相似文献
1000.
Tebogo Rahaba Ngoma 《Journal of International Entrepreneurship》2016,14(2):239-258
Within the growing body of Chinese entrepreneurship literature, guanxi is increasingly recognized as an important indigenous Chinese business practice with important implications for firm performance and success. Guanxi is defined as relationship or connection. China’s continued economic growth and forecasts of it becoming one of the world’s largest consumer markets present multinational corporations and foreign entrepreneurs alike with unprecedented economic opportunities. Thus, greater insight is required into how foreign entrepreneurs, as outsiders, establish and develop close guanxi relationships. Conceptualizing guanxi as a dynamic process, this paper explores the underlying interactions and processes foreign entrepreneurs engage in to establish and build a strong emotional connection and trust with their closest guanxi partner. Using an exploratory single case study approach, data from 15 foreign entrepreneurs operating legally registered small- and medium-size enterprises (SMEs) in Shanghai was collected and analyzed. In addition, self-administered structured questionnaires that utilize the McAllister trust scale were used to measure 20 foreign entrepreneurs’ levels of cognitive and affective trust toward their closest guanxi partner. Overall, the findings of the study provide an in-depth understanding of the complex interplay and functioning of third-party and anticipatory bases. In so doing, the study’s outsider perspective addresses a critical gap in the literature that yields initial yet important insights that contribute to a better understanding and appreciation of the inherent nuances and differences in relationship-building processes in cross-cultural settings. Furthermore, these findings bring to the fore the need to consider the ways in which this indigenous Chinese business practice may be evolving in the face of increasing internationalization. 相似文献