全文获取类型
收费全文 | 1575篇 |
免费 | 83篇 |
专业分类
财政金融 | 318篇 |
工业经济 | 152篇 |
计划管理 | 329篇 |
经济学 | 254篇 |
综合类 | 13篇 |
运输经济 | 55篇 |
旅游经济 | 55篇 |
贸易经济 | 271篇 |
农业经济 | 112篇 |
经济概况 | 96篇 |
信息产业经济 | 1篇 |
邮电经济 | 2篇 |
出版年
2023年 | 12篇 |
2022年 | 6篇 |
2021年 | 15篇 |
2020年 | 27篇 |
2019年 | 44篇 |
2018年 | 49篇 |
2017年 | 61篇 |
2016年 | 43篇 |
2015年 | 25篇 |
2014年 | 55篇 |
2013年 | 159篇 |
2012年 | 65篇 |
2011年 | 67篇 |
2010年 | 57篇 |
2009年 | 52篇 |
2008年 | 66篇 |
2007年 | 47篇 |
2006年 | 45篇 |
2005年 | 53篇 |
2004年 | 51篇 |
2003年 | 45篇 |
2002年 | 45篇 |
2001年 | 50篇 |
2000年 | 34篇 |
1999年 | 46篇 |
1998年 | 31篇 |
1997年 | 27篇 |
1996年 | 35篇 |
1995年 | 18篇 |
1994年 | 24篇 |
1993年 | 27篇 |
1992年 | 19篇 |
1991年 | 15篇 |
1990年 | 15篇 |
1989年 | 21篇 |
1988年 | 15篇 |
1987年 | 23篇 |
1986年 | 13篇 |
1985年 | 23篇 |
1984年 | 19篇 |
1983年 | 17篇 |
1982年 | 14篇 |
1981年 | 10篇 |
1980年 | 13篇 |
1979年 | 5篇 |
1978年 | 8篇 |
1977年 | 7篇 |
1976年 | 9篇 |
1974年 | 6篇 |
1973年 | 9篇 |
排序方式: 共有1658条查询结果,搜索用时 31 毫秒
81.
Is gold a hedge, defined as a security that is uncorrelated with stocks or bonds on average, or is it a safe haven, defined as a security that is uncorrelated with stocks and bonds in a market crash? We study constant and time‐varying relations between U.S., U.K. and German stock and bond returns and gold returns to investigate gold as a hedge and a safe haven. We find that gold is a hedge against stocks on average and a safe haven in extreme stock market conditions. A portfolio analysis further shows that the safe haven property is short‐lived. 相似文献
82.
83.
随着企业开始重新关注增长,创新冉一次成为了优先要务:在最近进行的麦肯锡全球调查中1,84%的高管称创新对于其企业的增长战略极为重要或非常重要.调查结果还显示,与危机前相比,企业用于产生出色创意并将这些创意转变为产品或服务的方法变化不大,而这并非因为高管们认为这些方法非常有效.此外,发现合适的人才、鼓励协作与承担风险,以及从头到尾组织创新流程等挑战也依然如故,这一点值得大家注意.事实上,过去几年的调查显示,成功创新的核心障碍一直没有变化,而企业在克服这些障碍方面也没有什么进展. 相似文献
84.
Namibia has a long history of providing a universal and non-contributory old age pension, child grants using means testing and quasi-conditionalities, and other cash transfers. Multivariate analysis presented in this paper confirms that these transfers play an important role in alleviating poverty, especially for the very poor. The poverty-reducing effects of the child grants are likely to increase further as access is being rapidly expanded. However, the impact in terms of reducing Namibia's extremely high inequality is limited. The targeting of the cash transfers towards the poorest groups takes place through two main channels. For the child grant, targeting occurs as a result of the orphan status eligibility criteria, as orphans are over-represented in lower-income households. For the universal social pension, it appears that some of the relatively less poor do not receive it even if they are eligible. Means testing of child grants appears ineffective, even without considering administrative costs. 相似文献
85.
86.
Paul Mwebaze Jim Monaghan Nicola Spence Alan MacLeod Martin Hare Brian Revell 《Journal of Agricultural Economics》2010,61(1):97-121
The risk of non‐indigenous plant pests entering the UK via international trade in fresh produce is increasing. The objective of this article is to identify existing and emerging supply sources for UK fresh produce importers and examine the extent to which they could provide invasion pathways. We tested the hypothesis that increased imports of fresh produce from new sources outside the European Union could increase the risks of non‐indigenous insect pests. We use a bio‐economic model approach in which the number of species arrivals is a function of the volume of imports, whereas the volume of imports itself is a function of gross domestic product, relative import prices and seasonality. The study has identified clear trends, which show import volumes of fresh produce and species detections increasing from new supply sources. If this trend continues in the future, then the UK inspection agency should expect to confront species from new suppliers in much greater numbers, given that import volumes of fresh produce are income elastic. 相似文献
87.
This article uses cointegration and error-correction models to analyze the causal relationship between agricultural export diversification and economic growth in eight selected Caribbean countries using annual data from 1961 to 2000. The empirical results show that in the short run, agricultural export diversification Granger causes economic growth in Barbados and Belize. Noncausality exists for the other countries. In the long run, agricultural export diversification also Granger causes economic growth in the Dominican Republic. On the contrary, agricultural export diversification is the outcome of the economic growth process in Belize, Costa Rica, Haiti, and Jamaica, in the long run. Noncausality exists in Trinidad and Tobago. There is no evidence of bi-directional causality in any of the countries in either the short or long run. 相似文献
88.
Mark Stevenson Sayed Faruque Abd Almajil Muhammad Farhan Brian Fildes Brendan Lawrence 《International journal of injury control and safety promotion》2017,24(1):84-88
This study evaluated the effectiveness of red-light cameras in Dammam, the Kingdom of Saudi Arabia. Two methods were used to assess changes in crash risk at the intersections at which the red-light camera programme had been operating. Geospatial analysis was used to visualize trends in road crash density over the geographical region of Dammam and a pre--post-camera crash analysis was undertaken. The distribution of injury crashes was greater than that of crashes which included property damage, the latter of which was concentrated around central Dammam. The five red-light cameras installed in 2012 were located outside areas of high-crash and injury density, and the total number of crashes reported in the three-month periods after installation was double that before the cameras were installed. This increase in the number of crashes also occurred at the five comparison sites (without red-light cameras), indicating a null effect. The findings from this study are contrary to previous evaluations of speed management programmes associated with red-light cameras. The study highlights the challenges in obtaining data for such research and illustrates that a reliance on overt, fixed camera's to manage speed is unlikely to deliver significant reductions in road trauma. 相似文献
89.
Brian Levine Linda Nozick Dean Jones 《Transportation Research Part E: Logistics and Transportation Review》2009,45(4):611-626
Containerized freight imports into the US are growing at an average of 10% per year. This traffic is concentrated at a small number of US seaports. It is therefore important to have an accurate understanding of the flow of containers from their origin country through these seaports to their final destination. This paper develops an optimization model to estimate route flows and a corresponding multi-modal origin–destination table for containers by synthesizing data on international trade and railcar movements with a gravity model for the demand of container traffic. This analysis provides insights into the balance of rail and truck inland transportation from each port. 相似文献
90.
Alexander E. Ellinger Malini Natarajarathinam Frank G. Adams J. Brian Gray Debra Hofman Kevin O’Marah 《Journal of Business Logistics》2011,32(3):214-226
Supply chain management (SCM) plays a major role in creating (or destroying) shareholder value by influencing the three major drivers of firm financial performance: revenue, operating costs, and working capital. Yet, the relationship between SCM competency and firm financial performance is not well‐established. Drawing on the resource‐based view of the firm, this study assesses this relationship using Delphi‐style opinion data from AMR Research’s Supply Chain Top 25 rankings to assess SCM competency and Altman’s (1968) Z‐score statistic as the measure of financial success. The study findings show that firms recognized by industry experts for SCM competency have significantly higher Z‐scores than their close competitors and industry averages. 相似文献