首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   4164篇
  免费   502篇
  国内免费   17篇
财政金融   254篇
工业经济   158篇
计划管理   969篇
经济学   617篇
综合类   601篇
运输经济   45篇
旅游经济   120篇
贸易经济   579篇
农业经济   672篇
经济概况   668篇
  2025年   31篇
  2024年   82篇
  2023年   104篇
  2022年   129篇
  2021年   179篇
  2020年   202篇
  2019年   144篇
  2018年   104篇
  2017年   115篇
  2016年   150篇
  2015年   169篇
  2014年   351篇
  2013年   363篇
  2012年   382篇
  2011年   443篇
  2010年   327篇
  2009年   291篇
  2008年   263篇
  2007年   234篇
  2006年   201篇
  2005年   111篇
  2004年   82篇
  2003年   75篇
  2002年   41篇
  2001年   36篇
  2000年   28篇
  1999年   13篇
  1998年   4篇
  1997年   9篇
  1996年   4篇
  1995年   4篇
  1994年   1篇
  1993年   2篇
  1992年   3篇
  1991年   1篇
  1989年   2篇
  1983年   1篇
  1981年   2篇
排序方式: 共有4683条查询结果,搜索用时 0 毫秒
71.
根据微观经济学的需求理论,结合相关研究进展,文章构建了包括基本经济因素(收入和相对价格)、对外开放度、旅游业发展水平、人口统计特征、突发事件等变量在内的出境旅游需求模型,以74个国家/地区1995—2013年的数据为样本,分析了发达经济体和发展中经济体出境旅游需求影响因素的总体特征与异同。结果表明,收入和价格是影响出境旅游需求的决定性因素,对外开放度、旅游业发展水平、人口统计特征及突发事件等其他因素对出境旅游需求同样具有一定的影响。其中,收入、价格以及产业发展水平对发展中经济体出境旅游需求的影响作用相对更大,而对外开放度和人口统计特征(就业水平、年龄结构和受教育水平)对发达经济体出境旅游需求的影响更加显著。  相似文献   
72.
Electronic-marketplace (EM) is an innovative model for interfirm transactions that are undertaken via the Internet. However, in view of higher investment costs and other associated risks, many small and medium-sized enterprises (SMEs), instead of establishing their own EMs, turn to adopt third-party-hosted EMs. In literature, most relevant studies to the adoption of the third-party-hosted EM were conducted on the research contexts of free market. Industries under the protection of government policies may have limited degree of market freedom, different from industries without these protection policies. Thus, this study intends to compare the decision choice of EM adoption between industries with various degree of market freedom. The decision choice of EM adoption consisted of many strategic factors that were constructed in terms of a three-layer hierarchical structure proposed in this paper. A fuzzy analytic hierarchical process (Fuzzy AHP) was utilized to estimate the relative importance of these individual strategic factors involved in the decision-making process of adopting third-party EMs. The research findings indicated there were some similarities and differences in the decision choice between the two industries of interest. The variety of market freedom can account for the differences in the decision choice of EM adoption. In addition to enhancing our understanding of the EM adoption decision of participative companies, the research findings also provide insightful information to third-party EM providers so that they may improve the effectiveness and efficiency of resource allocation.  相似文献   
73.
The present research investigated and studied students’ representations about daily life technologies, in a prospect of studying technology in Greek primary education. In the research participated 60 Greek primary school students aged 9 to 12 years old. Research data were collected through semi-structured, personal, clinical-type interviews. Each interview investigated student’s conceptions and views about the following thematic areas: the concept of technology, daily life technologies, technological change, and the impact of technology use in everyday life. Data analysis revealed that the majority of students equated technology with modern tools and appliances, especially with computers, TV, mobile phones, satellites and other micro- and macro-technologies, whereas experience based technologies (de Vries, Technology education: Beyond the “technology is applied science” paradigm. J. Technol. Edu. 8 (1996), 7) have been hardly recognized by them as technology. Also students’ representations can be categorized either as technology-oriented representations, which focus on a collection of technical means without reference to humans, or as human-oriented representations, focused on technical means with substantial reference to human needs and activities. Depending on these types of representations, students seem to conceive differently the nature of the problems, which they recognize that the wide use of technology causes mainly to the environment and the responsibility of the user for these problems. Moreover, it seems that the concept of technological change is a quite difficult one for the students. In order to help students form adequate representations about daily life technology and technological change an appropriate teaching approach was designed on the basis of these students’ representations.  相似文献   
74.
我国EPC总承包商在投标报价时面临设计深度不足、施工过程不确定性大等风险,导致其投标报价的难度相较于传统承发包模式更大,为保证总承包企业在EPC项目中能够获得最佳的收益,本文在EPC总承包项目投标报价特征的基础上,分析投标报价的内容及其计算方法,并对EPC总承包项目投标报价的影响因素进行识别与阐述,最后辅以工程实例进行说明。研究结论为总承包企业在EPC项目中的投标报价起借鉴作用,进而促进我国EPC总承包模式的健康发展。  相似文献   
75.
文章通过选取几种不同的絮凝剂进行研究,来选出对木糖废水处理效果最佳的絮凝剂及其最佳絮凝条件、最佳去除率。从硫酸铝、三氯化铝、PAC、硫酸铁、硫酸亚铁、三氯化铁中选出PAC和Al2(SO4)3,然后针对这两种絮凝剂,研究确定其最佳絮凝条件及最大去除率。PAC的最佳实验条件为:投加量为1.6 g/L,pH=6,快速搅拌时间为30 s,沉降时间为30 min;Al2(SO4)3的最佳实验条件为:投加量为1 g/L,原水pH=6,快速搅拌时间为90 s,沉降时间为30 min。絮凝效果为:COD去除率分别为82.3%和75.38%,色度去除率都达到了90%以上。  相似文献   
76.
    
This study aims to improve understanding of the ethical nature of the relations in two labour-intensive industries to facilitate the creation of an ethical culture. For this purpose, the authors first review literature related to the main influences on ethical behaviour, then perform an empirical analysis of those factors using a hierarchical stepwise regression of a database of 525 banking and insurance employees. Contrary to expectations, leadership has a less important effect on ethical behaviour than other organizational factors. The results reveal several implications for improving the management of ethical behaviour in these industries.  相似文献   
77.
    
This paper integrates two conceptual frameworks, utility maximization and institutional theory, to analyze voluntary corporate environmental management. The utility maximization or economic approach centers on motivations to decrease cost, increase revenue and improve manager utility. Institutional theory emphasizes how external pressures from market and non‐market constituents shape the firm's environmental efforts. We view the two frameworks as complementary and postulate a model that includes both types of influences. Survey data from six major industries consisting of a diverse set of facilities are used to estimate the effects of economic and institutional factors on a facility's use of environmental practices and pollution‐prevention activities. Our results support the hypothesized model, and show that cost barriers, management attitudes toward environmental stewardship, company ownership and external institutional forces, including competitiveness, investor and regulatory pressures, all affect a facility's environmental practices and pollution prevention activities. Findings suggest that a multifaceted policy strategy is needed to advance corporate environmental management across diverse firms. Copyright © 2012 John Wiley & Sons, Ltd and ERP Environment  相似文献   
78.
魏国  李楠 《价值工程》2011,30(6):164-164
对高层建筑设计中的一些问题和规范中的一些规定进行讨论,并且较好地满足了结构设计要求,实现了建筑与结构的统一,同时对贯彻实施设计规范、标准方面存在的问题提出解决方法,为高层建筑发展创造了前所未有的机遇,高层建筑也成为城市空间中一道独特的风景,对钢筋混凝土建筑设计中的一些问题和规范中的一些规定进行分析,对构造的具体措施进行分析研讨,对高层建筑的因素进行归纳分析。  相似文献   
79.
    
As there is a lack of understanding about cruise travelers' eco‐friendly behaviors and knowledge about eco‐friendly cruises, this study attempted to examine the role of green value, satisfaction, desire, and internal and external normative factors in building passengers' green loyalty for environmentally responsible cruises. A survey methodology and structural equation modeling were utilized to achieve the research purpose. Data quality assessment revealed that all measures for variables included an adequate level of reliability and validity. Results of the structural analysis indicated that our theoretical framework had a sufficient level of anticipation power for loyalty. The proposed associations among study variables were generally supported. The significant indirect influence of green values and social norms on loyalty was identified. Moreover, the magnitude of the total influence of social norms on loyalty was the greatest among the study constructs. Overall, our findings offer valuable and meaningful insights for cruise researchers and practitioners. Copyright © 2017 John Wiley & Sons, Ltd and ERP Environment  相似文献   
80.
随着重庆建设我国金融中心步伐的日益加快,本文针对如何界定重庆政府在建设金融中心的金融要素市场培育的三种理论为出发点,根据制度经济学"政府在制度变迁中提供的基本服务是博弈的基本规则"的原理,运用道格拉斯·诺斯制度变迁和经济增长的理论模型,提出重庆政府行为边界的具体构建框架,即完善稳定金融要素体系,提供配套基础设施及环境支持;为健全金融要素市场提供政策保障;随着金融要素市场不断形成出台并规范相关法律法规,明确规定政府行为边界,为重庆金融要素市场的培育提供有力的支持和保护。  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号