全文获取类型
收费全文 | 11712篇 |
免费 | 571篇 |
国内免费 | 188篇 |
专业分类
财政金融 | 358篇 |
工业经济 | 952篇 |
计划管理 | 3749篇 |
经济学 | 2157篇 |
综合类 | 1216篇 |
运输经济 | 57篇 |
旅游经济 | 129篇 |
贸易经济 | 1500篇 |
农业经济 | 722篇 |
经济概况 | 1631篇 |
出版年
2024年 | 33篇 |
2023年 | 212篇 |
2022年 | 338篇 |
2021年 | 448篇 |
2020年 | 424篇 |
2019年 | 228篇 |
2018年 | 199篇 |
2017年 | 221篇 |
2016年 | 302篇 |
2015年 | 468篇 |
2014年 | 1137篇 |
2013年 | 1138篇 |
2012年 | 1117篇 |
2011年 | 1233篇 |
2010年 | 994篇 |
2009年 | 670篇 |
2008年 | 639篇 |
2007年 | 590篇 |
2006年 | 504篇 |
2005年 | 409篇 |
2004年 | 282篇 |
2003年 | 209篇 |
2002年 | 180篇 |
2001年 | 151篇 |
2000年 | 105篇 |
1999年 | 64篇 |
1998年 | 41篇 |
1997年 | 32篇 |
1996年 | 12篇 |
1995年 | 19篇 |
1994年 | 18篇 |
1993年 | 8篇 |
1992年 | 4篇 |
1991年 | 6篇 |
1990年 | 1篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1985年 | 3篇 |
1984年 | 7篇 |
1983年 | 12篇 |
1982年 | 10篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
61.
信息技术产业创新发展的研究具有现实意义。通过文献研究建立信息技术产业创新演化复杂系统研究框架,汇总认知角度的创新层次、产业演化以及演化研究工具和方法等相关研究情况,认为应重视动态、演化和复杂系统的特点,政府介入推动自组织网络的高效率演化和发展,促进网络化学习,避免低端依赖,促进创新效率。创新系统研究应包含认知领域的相关成果,利用演化计算和机器学习方法构建模型,提升对真实行为的模拟仿真和解释能力。 相似文献
62.
河南省传统村落空间分布特征及影响因素研究 总被引:1,自引:0,他引:1
[目的]分析河南省传统村落的空间分布特征及其影响因素,以期为中原地区传统村落的建设发展提供指导。[方法]文章通过谷歌地理信息系统及Arc GIS10. 2软件对河南省124个国家级传统村落的空间分布类型、分布格局、分布均衡型及影响因素进行分析,采用最邻近距离法、核密度估计法及地理集中程度等方法揭示其空间分布特征及其形成的影响因素。[结果]最邻近距离法分析R=0. 628,小于1,分布类型为凝聚型。核密度分析中,整体空间分布呈现3个核心区域,平顶山东北区域,豫西北沿省边界呈带状分布及豫南信阳南部,空间分布受地理、经济和文化等因素影响。[结论]河南省传统村落的空间分布属凝聚型不均衡分布。从地级市层面上分析,主要集中在平顶山东部、信阳南部和三门峡地区;从分区层面上,以豫中较多,豫北、豫西和豫南其次,豫东基本空白。形成原因与地理高程、社会经济和历史事件有关。交通不便、经济相对发达或相对落后、历史事件少发的区域,传统村落保存较为完整。 相似文献
63.
64.
Kolawole Ogundari Olufemi D. Bolarinwa 《The Australian journal of agricultural and resource economics》2018,62(2):217-236
The impacts of adopting agricultural innovation and technology are widely examined. This paper synthesises 154 studies, which yielded a total of 600 estimates of the impact of adopting agricultural innovation and technology on production, social and economic outcomes. Using meta‐regression analysis, the empirical results show that the reported impact of adopting agricultural innovation and technology rises significantly over time, notwithstanding a significant publication bias. Whether studies find significant impacts of adopting agricultural innovation and technology depends on the use of experimental research designs, parametric method, endogenous switching regression and region. Our results show a large bias in the literature towards agricultural innovations and technologies that focus on high‐yielding varieties and thus, neglect other forms of complementary innovations and technologies. 相似文献
65.
Andreas Gramzow Haroon Sseguya Victor Afari-Sefa Mateete Bekunda Philipo J. Lukumay 《国际农业可持续发展杂志》2018,16(3):297-309
One of the widely suggested approaches to meet the increasing food demand of a substantially growing world population is sustainable intensification. We present a unique agricultural research and scaling programme in Tanzania, focusing on the key elements necessary for results related to: gender analysis; private sector engagement; social capital; improvement and adaptation; and programme performance monitoring and evaluation. Since 2014, more than 6000 farmers have benefited from either the adaptive research or the scaling component of the programme. Preliminary impact analysis results from six pilot locations indicate that programme participants realized significantly higher yields compared to non-participants. In addition to productivity improvements, introducing resistant and drought-tolerant elite vegetable varieties improved the resilience of the existing farming systems. Finally, considering the needs of both male and female participants had a positive impact on technology adoption rates and reach. 相似文献
66.
Research Summary: A learning‐by‐hiring approach is used to scrutinize scientists' mobility in relation to the recruiting firms' subsequent innovation output. Our starting point is that among firm hires, individuals with university research experience—hired from universities or firms—can be particularly valuable. However, conflicting institutional logics between academia and industry makes working with academic scientists challenging at times for firms. We suggest two solutions to this difficulty: hiring “ambidextrous” individuals with a mix of experience of university research and working for a technologically advanced firm, and a strong organizational research culture in the recruiting firm reflected by the presence of a scientist on the top management team. We track the mobility of R&D workers empirically using patent and linked employer‐employee data. Managerial Summary: An important way to make organizations more innovative is hiring individual researchers with the right types of skills and experience. We show that individuals with university research experience beyond their final degree are particularly likely to help boost firm‐level innovation output after hiring compared to R&D workers with other types of skills and experience. However, to obtain good returns to innovation from hiring such individuals, firms need a university research–friendly organizational culture when hiring individuals with university research experience, from either firms or academia. 相似文献
67.
68.
陈青松 《中小企业管理与科技》2021,(10):185-186
桥梁工程具有周期长以及范围大等特点。因此,在桥梁施工中任何一个环节出现偏差,都可能诱发裂缝或剥离等问题,最终影响整个桥梁的质量。路面防水工程是桥梁施工项目中的重要环节,防水工程的施工质量将直接影响桥梁结构的整体质量以及使用寿命。因此,在桥梁防水施工过程中,要选择合格的施工材料以及最优的施工方法,从而提高桥梁路面防水工程的施工质量。 相似文献
69.
F. Gregory Hayden 《Journal of economic issues》2020,54(2):370-376
Abstract:The instrumental-ceremonial dichotomy is the analytical concern emphasized in instrumental analysis by original institutional economists for making welfare decisions. Paul Dale Bush and Wolfram Elsner explained that warranted criteria are required in order to conduct instrumental analysis. The concern for criteria led to an examination of multiple criteria decision analysis in health technology assessment in order to improve instrumental analysis. Health technology assessment (HTA) is one of the most active and extensive areas of analysis for policy making because medical technology changes very rapidly, expenditures on it are high and growing, it can harm as well as help, and there is intense personal concern by citizens who want wellness. Although HTA, especially with regard to the analysis of multiple criteria, has made considerable progress, its appraisal has been a disappointment. Thus, the purpose of this paper is to critique aspects of multiple criteria HTA in order to further develop instrumental analysis. 相似文献
70.
David Ahlstrom Jean-Luc Arregle Michael A. Hitt Gongming Qian Xufei Ma Dries Faems 《Journal of Management Studies》2020,57(3):411-437
A New Normal environment for business has emerged in the years after the 2008 financial crisis based on numerous changes in the world's economic, technological, demographic, and sociopolitical factors. This combination of changes has created a New Normal environment for firms with major implications for managers, strategists, and entrepreneurs alike. It has resulted in an environment with new challenges and opportunities that are considerably different from what firms had to contend with in the years previous. In this paper, we present the main changes that characterize the current New Normal business environment and highlight some key implications for strategy and management. Then, we present the nine articles in this special issue dealing with different dimensions of this new environment for firms. Subsequently, we outline some future research questions that could help to advance our knowledge of the New Normal environment and its implications for firms and management theories. In examining the New Normal, it is important to be reminded that the world is indeed round and even small actions on one side of the globe can have a major impact on organizations on the other side of the globe. 相似文献