全文获取类型
收费全文 | 120篇 |
免费 | 14篇 |
国内免费 | 2篇 |
专业分类
财政金融 | 24篇 |
工业经济 | 11篇 |
计划管理 | 10篇 |
经济学 | 22篇 |
综合类 | 2篇 |
运输经济 | 1篇 |
旅游经济 | 2篇 |
贸易经济 | 12篇 |
农业经济 | 5篇 |
经济概况 | 13篇 |
水利工程 | 34篇 |
出版年
2024年 | 1篇 |
2023年 | 4篇 |
2022年 | 1篇 |
2021年 | 2篇 |
2020年 | 6篇 |
2019年 | 3篇 |
2018年 | 10篇 |
2017年 | 7篇 |
2016年 | 5篇 |
2015年 | 6篇 |
2014年 | 8篇 |
2013年 | 16篇 |
2012年 | 8篇 |
2011年 | 9篇 |
2010年 | 7篇 |
2009年 | 8篇 |
2008年 | 4篇 |
2007年 | 8篇 |
2006年 | 2篇 |
2005年 | 2篇 |
2004年 | 3篇 |
2003年 | 1篇 |
2002年 | 1篇 |
1998年 | 1篇 |
1996年 | 1篇 |
1993年 | 2篇 |
1989年 | 2篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1984年 | 1篇 |
1980年 | 1篇 |
1978年 | 1篇 |
1975年 | 1篇 |
1974年 | 1篇 |
1972年 | 1篇 |
排序方式: 共有136条查询结果,搜索用时 343 毫秒
21.
22.
The agreement to abolish the quotas on textiles and clothing introduced under the Multi‐fiber Arrangement (MFA) will create a new and much more competitive world market for India's exports of textiles and clothing. India's inefficient and costly policies, such as cotton export quotas, the hank yarn obligation, and the restrictive policies on foreign investment that have held back productivity in the Indian apparel sector, will impose serious costs. The authors consider the implications of reforming these policies in an open trading environment using a multiregion, applied general‐equilibrium model. They find that the costs of these policies to India increase substantially following abolition of the MFA; the benefits to India from domestic reforms are considerably enhanced when there is global free trade in textiles and apparel. 相似文献
23.
洪河自然保护区丹顶鹤秋季觅食生境初步研究 总被引:4,自引:0,他引:4
2005-10-12~21对洪河自然保护区秋季丹顶鹤的觅食生境采用因子测定法,对栖息地进行了觅食生境的研究,包括植物高度、植物密度、植物盖度、水深、水流、人为干扰等。对丹顶鹤觅食生境进行样方测定。结果表明洪河自然保护区的植物盖度为49.50%,植物密度为491株/㎡。根据对野外调查数据用标准差分析以及平均值比较等数学方法处理,得出了以下结论:丹顶鹤喜好在植物高度60-120cm,植物盖度低于75%,植物密度在600棵/㎡的左右生境中觅食,距人类活动场所的距离大于500m的生境中觅食。本研究为保护丹顶鹤栖息地提供重要的依据。 相似文献
24.
科技进步已成为推动银川市经济发展的主要动力,在银川市的经济发展中起着先导的作用.但与沿海地区比较,银川的科技作用还是很不够的,还存在着制约科技进步和发挥作用的因素.发展和繁荣银川市经济,需要加快实施科技进步的步伐,强化人力资源开发,建立创新体制和机制,调整产业结构、改造传统产业,增加科技资金投入、加大基础研究,加强与区外的交流与合作. 相似文献
25.
Kareem Mohamed Amr Aziz Belal Mohamed Khaled Abdel‐Hakeem Mostafa Mostafa Ayman Atia 《International Journal of Intelligent Systems in Accounting, Finance & Management》2019,26(4):193-201
Money exchange is one of the most common day‐to‐day activities performed by humans in the daily market. This paper presents an approach to money tracking through a blockchain. The proposed approach consists of three main components: serial number localization, serial number recognition, and a blockchain to store all transactions and ownership transfers. The approach was tested with a total of 110 banknotes of different currency types and achieved an average accuracy of 91.17%. We conducted a user study in real‐time with 21 users, and the mean accuracy across all users was 86.42%. Each user gave us feedback on the proposed approach, and most of them welcomed the idea. 相似文献
26.
选取河北省黑龙港地区平原地下水开采区——沧县为典型示范区,在了解该区域基本情况的基础上,介绍了浅层和深层地下水开采量监测的几种方法,即:统计法、典型点法以及水电转化法;对运用这几种方法来计算工业、农业和人畜生活等地下水开采量的过程进行了分析研究。在分析过程中,借助于SPSS软件进行了多元回归分析;并建立了月水位变化与月开采量相关关系、年水位变化与年开采量相关关系,定性地确立了水位与埋深的相关关系。与此同时,根据典型示范区的实测地下水埋深等数据资料,与地下水开采量指标进行了拟合。分析结果可为水位控制和取水总量控制提供技术支撑和科学依据。 相似文献
27.
Étienne St-Jean Maripier Tremblay Frank Janssen Jacques Baronet Christophe Loué Aziz Nafa 《The International Entrepreneurship and Management Journal》2017,13(1):97-111
Networks are recognized as a central component of the entrepreneurial process, in particular with regard to opportunity identification and exploitation. In this study, we specifically analyze the role of mentors who are in business as opportunity brokers and enablers among university students with entrepreneurial intentions. Our investigation on 1022 students from 13 French-language universities based in Canada, France, Belgium and Algeria indicates that mentors in business, contrary to other mentors, support opportunity identification and exploitation among university students. Although student gender, entrepreneurial experience and education have a more pronounced effect, mentoring is the only element that can be controlled for through the creation of formal support programs. These results call on public authorities, and universities in particular, to implement formal mentoring programs to support students who are interested in starting their own business, and who would not otherwise have access to business mentors in their environment. 相似文献
28.
29.
30.
Charles Yuji Horioka Emin Gahramanov Aziz Hayat Xueli Tang 《International Economic Review》2018,59(1):113-136
We conduct a theoretical and empirical analysis of why children live with (or near) their parents and provide care and assistance to them using microdata from a Japanese household survey, the Osaka University Preference Parameter Study. We find that the Japanese are more likely to live with (or near) their elderly parents and/or to provide care and attention to them if they expect to receive a bequest from them, which constitutes strong support for the strategic bequest motive, but that their caregiving behavior is also heavily influenced by the strength of their altruism toward their parents and social norms. 相似文献