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   6169篇
  免费   251篇
  国内免费   31篇
财政金融   145篇
工业经济   579篇
计划管理   3065篇
经济学   551篇
综合类   675篇
运输经济   121篇
旅游经济   101篇
贸易经济   758篇
农业经济   159篇
经济概况   297篇
  2024年   2篇
  2023年   61篇
  2022年   103篇
  2021年   112篇
  2020年   130篇
  2019年   116篇
  2018年   69篇
  2017年   104篇
  2016年   108篇
  2015年   247篇
  2014年   544篇
  2013年   536篇
  2012年   710篇
  2011年   848篇
  2010年   707篇
  2009年   358篇
  2008年   320篇
  2007年   290篇
  2006年   245篇
  2005年   215篇
  2004年   139篇
  2003年   112篇
  2002年   88篇
  2001年   67篇
  2000年   50篇
  1999年   38篇
  1998年   34篇
  1997年   29篇
  1996年   13篇
  1995年   10篇
  1994年   8篇
  1993年   8篇
  1992年   6篇
  1991年   2篇
  1990年   9篇
  1989年   1篇
  1988年   1篇
  1987年   3篇
  1986年   2篇
  1985年   3篇
  1983年   2篇
  1982年   1篇
排序方式: 共有6451条查询结果,搜索用时 15 毫秒
61.
马壮 《价值工程》2021,(3):212-213
水资源的合理、科学以及绿色的使用是确保国家高效成长以及保护社会正常运行的前提条件,因此创建生态水利工程具有至关重要的意义。现如今本国的水资源被污染以及浪费的程度愈来愈大,能够将水资源合理、可续的使用起来是水利创建当中最为核心的内容,因此本国的相关单位对于生态水利工程的创建有着极大的重视。针对于此,全文着重探讨了生态水利工程策划的意义、在创建水利工程当中生态水利工程策划需要遵守原则以及生态水利工程在水利创建当中的使用,仅供参考。  相似文献   
62.
现阶段,随着社会经济的飞速发展,道路基础设施的建设速度逐渐加快。同时,随着各种各样桥梁病害问题的出现,对桥梁的承载能力造成了一定程度的影响。因此,及时防治桥梁病害有助于保障桥梁的安全性。论文结合某危桥改造项目,对桥梁的病害展开研讨,对病害的产生原因进行分析,并提供实用性的桥梁设计应对方法,以保证桥梁的耐久性与安全性。  相似文献   
63.
    
This dissertation aims at elucidating the history of Vernon Smith’s experimental economics by focusing its attention upon the three themes of rationality, minds and machines that assumed significance at different (albeit overlapping) stages of the development of Smith’s experimental economics with the help of his published and unpublished papers.Chapter 1 is devoted to the scrutiny of the form of rationality incorporated into the portions of Smith’s laboratory experiments whose results have usually been taken as corroborations of his “Hayek Hypothesis.” By bringing into the foreground Smith’s definite position on demand theory and its concrete instantiations on many different occasions, we make the case that Smith has consistently imposed by means of the induced value theory certain narrowly defined preference structures that have definite implications for the form of rationality instantiated in the laboratory.The main narrative in Chapter 2 concerns Smith’s intellectual interchanges with behavioral scientists in the early 1960s, more specifically, his reactions to behavioral scientists’ attempts at cognitive modeling. We present several reasons for interpreting Smith’s initiation of the attempt at the maximization-based induced value theory as an endeavor to discipline subjects’ minds. We also provide in Chapter 2 a portrayal of Smith’s missed opportunities to get involved in the large-scale laboratory experimentation projects pursued in the 1950s in close connection with several branches of psychology.Chapter 3 consists of two parts. In Part 1, we describe the origin of mechanism design economics, and offer a detailed explanation of the analytical kinship between Smith’s “microeconomic system theory” and the standard conceptual framework utilized in mechanism design economics. Part 2 is devoted to describing the roles played by the computer in both Smith’s empirical research agenda and the theoretical, mechanism design research pursued by Stanley Reiter (one of Smith’s intellectual companions since the 1950s). Our historical narrative in Chapter 3 is intended to clarify that computer experience and computational theory drove the development of Reiter’ version of mechanism design economics, and that they also (partially) shaped some crucial events in the history of Smith’s version of experimental economics.JEL Classification: B21, B31, C90, C92, D02Prof. Philip E. Mirowski: Advisor  相似文献   
64.
Consider an estimate of the common value of an auctioned asset that is symmetric in the bidders’ types. Such an estimate can be represented solely in terms of the order statistics of those types. This representation forms the basis for a pricing rule yielding truthful bidding as an equilibrium, whether bidders’ types are affiliated or independent. We highlight the link between the estimator and full surplus extraction, providing a necessary and sufficient condition for ex-post full surplus extraction, including the possibility of independent types. The results offer sharp insights into the strengths and limits of simple auctions by identifying the source of informational rents in such environments. Harstad acknowledges hospitable accommodation by the Fuqua School of Business, Duke University, and the Olin School of Business, Washington University in St. Louis, during parts of this research. We are grateful for comments and suggestions from Richard McLean and Jeroen Swinkels.  相似文献   
65.
基于生态学的思考,小城镇新区规划设计应树立五个新理念:深化人本思想、突出文化内涵、注重景观设计、树立超前意识、发扬务实精神。新理念在实践过程中体现在:营造人性化的小城镇新区、塑造地方性的小城镇特色、打造园林式的小城镇景观、构造灵活性的小城镇格局、绘就实用性的小城镇蓝图。  相似文献   
66.
Objective: To investigate preferences for fertility treatment from the Australian general population with the aims of calculating the willingness to pay in tax contribution for attributes (characteristics) that make up treatment and for an “ideal” fertility treatment program. We also assessed whether willingness-to-pay varies by the relationship status or sexual orientation of the patient.

Methods: A stated preference discrete choice experiment was administered to a panel of 801 individuals representative of the Australian general population. Seven attributes of fertility treatment under three broad categories were included: outcome, process, and cost. Attributes were identified through published literature, focus group discussions, expert knowledge, and a pilot study. A Bayesian fractional experimental design was used, and data analysis was performed using a generalized multinomial logit model. Further analyses included interaction terms and latent class modeling.

Results: Six of the seven attributes influenced the choice of a treatment program. Under process attributes, individuals preferred: continuity of care of clinic staff, where patients are seen by the same doctor but different nurses at each visit; “alternative” treatments being offered to all patients; and onsite clinic counseling and peer-support groups. Personalization and tailoring of the treatment journey were not important. Among outcome attributes, the improved success rate of having a baby per cycle and significant side-effects were considered important. Cost of treatment also influenced the choice of treatment program. Individual preferences for fertility treatment were not associated with patients’ relationship status or sexual orientation. Latent class modeling revealed sub-groups with distinct fertility treatment preferences.

Conclusion: This study provides important insights into the attributes that influence the preferences of fertility treatment in Australia. It also estimates socially-inclusive willingness-to-pay values in tax contributions for an “ideal” package of treatment. The results can inform economic evaluations of fertility treatment programs.  相似文献   

67.
本文从农业可持续发展、资源永续利用的原则出发,探讨了构建生态农业模式的原则,以山东省广饶县为例,系统分析了在该县构建和应用生态农业模式的优势条件和制约因素,具体论述了适合广饶县发展的三种生态农业模式:农—牧—沼型、上粮下渔型和草—畜—乳型生态农业模式。  相似文献   
68.
模块化设计作为新产业结构的本质特征,实际上是工业时代产品标准化概念的延伸和发展。它既强调产品的统一性和各部分的标准化,同时又强调产品整体最优和各部分的创新性。分解组合思想是其基本思想所在,即将大系统“化整为零”,分解成为若干小系统,实现小系统局部最优和将小系统“合零为整”,使之相互协调配合,实现大系统全局最优的结合。文中运用系统评价的价值分析方法,以功能为核心对系统进行分解,使具有协同作用的模块的组合形成功能组合,达到整体功能最优,从而实现功能放大的效果,同时通过个别模块的替代或特定模块的升级带动整体功能的替换或功能水平的提升。由此看来,将价值管理应用于模块化设计中,为多样化时代的标准化工作提供了新的技术管理方式和思维方式。  相似文献   
69.
夏明进  霍达 《基建优化》2004,25(6):39-41
现役建筑结构经过一段时间的使用,其抗力和荷载效应都与设计时的不同。本文根据实际情况,采用串联分析模型,计算结构体系的失效概率。并通过对结构体系的失效概率直接进行调整,实现对现役结构可靠度的维修设计。以此对结构的安全性进行评估,为框架结构的维修决策提供了依据。  相似文献   
70.
In this paper we consider the exact D-optimal designs for estimation of the unknown parameters in the two factors, each at only two-level, main effects model with autocorrelated errors. The vector of the n random errors in the observed responses is assumed to follow a first-order autoregressive model (AR(1)). The exact D-optimal designs seek the optimal combinations of the design levels as well as the optimal run orders, so that the determinant of the information matrix of BLUEs for the unknown parameters is maximized. Bora-Senta and Moyssiadis (1999) gave some conjectures about the exact D-optimal designs based on their experience of several exhaustive searches. In this paper their conjectures are partially proved to be true.Received: January 2003 / Accepted: October 2003Partially supported by the National Science Council of Taiwan, R.O.C. under grant NSC 91-2115-M-008-013.Supported in part by the National Science Council of Taiwan, R.O.C. under grant NSC 89-2118-M-110-003.  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