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   2139篇
  免费   95篇
  国内免费   14篇
财政金融   784篇
工业经济   56篇
计划管理   278篇
经济学   370篇
综合类   157篇
运输经济   44篇
旅游经济   13篇
贸易经济   241篇
农业经济   114篇
经济概况   191篇
  2024年   8篇
  2023年   43篇
  2022年   44篇
  2021年   56篇
  2020年   110篇
  2019年   100篇
  2018年   75篇
  2017年   74篇
  2016年   76篇
  2015年   76篇
  2014年   150篇
  2013年   206篇
  2012年   138篇
  2011年   180篇
  2010年   112篇
  2009年   91篇
  2008年   129篇
  2007年   99篇
  2006年   105篇
  2005年   92篇
  2004年   50篇
  2003年   46篇
  2002年   41篇
  2001年   30篇
  2000年   27篇
  1999年   19篇
  1998年   25篇
  1997年   17篇
  1996年   11篇
  1995年   6篇
  1994年   4篇
  1993年   4篇
  1992年   2篇
  1991年   1篇
  1989年   1篇
排序方式: 共有2248条查询结果,搜索用时 15 毫秒
141.
结合城镇污水处理厂脱氮除磷改造工程实例,对老氧化沟进行功能区划分、设备改造:增加好氧区溶解氧浓度,降低缺(厌)区溶解氧浓度;同时适当增容,延长氧化沟水力停留时间和污泥泥龄。运行结果表明,系统出水主要指标稳定达到GB18918—2002一级A标准。  相似文献   
142.
我国森林碳汇市场构建的研究   总被引:2,自引:0,他引:2  
随着气候变暖趋势的到来,对森林碳汇市场这种新兴市场的研究,在国际上已经迅速开展起来。然而,在我国,森林碳汇市场并未得到其应有的发展。在阐述了森林碳汇市场在我国建立的必要性与可行性、发展优势与市场建立的障碍以及发展的巨大潜力的基础上,从五个方面分析了森林碳汇市场的运行机制,提出了构建我国森林碳汇市场的具体措施和建议。  相似文献   
143.
本文立足于我国网上银行运营的实际情况,以现行法律规范为基础,针对网上银行交易和网上银行监管所涉及的法律问题进行分析。  相似文献   
144.
Despite the passage of several decades since the revolution of 1989, there is little professional literature designed to prepare foreign investors for the Romanian business culture. Visitors to this nation discover a friendly people who engage in business practices often characterized as perplexing, frustrating, and imbued with self-defeating actions. The communist period in Romania's history imbedded unethical behavior into the nation's culture, including the morally ambiguous practice of favor trading. This paper describes this central business activity and how it shapes business dealings and often undermines opportunities. The cultural context that created the favor trading environment is discussed, and methods for managing this perplexing practice are explained.  相似文献   
145.
随着国内金融市场的不断发展与完善,程序化交易变得越来越受关注。目前国内大多数程序化交易者并没有建立起一个完备的检测与优化体系,采取的测试方式大多为简单的历史数据回溯测试,这容易导致对历史数据曲线的过度拟合。论文构造出一个较完整的程序化交易系统的检测与优化体系,依次分为六个步骤:设计交易策略,交易策略程式化,验证性检测,交易系统最优化,推进的样本外测试,实战交易。通过此体系可以分析交易模型的风险与收益水平及策略的稳定性,并得出健全的交易策略需具备的特点:获利相对均匀分布、具有相对稳定的盈亏次数比率、具有连续且平滑的最优化参数集、适应不同类型的市场且风险可控。  相似文献   
146.
箱式变电所以其显著优点,在住宅小区建设(改造)中得到推广应用。文章以南宁市某住宅小区为例,论述箱式变电所设计中应注意的问题。  相似文献   
147.
针对机场季节旅客吞吐量的特点,提出了基于趋势分解的机场季节旅客吞吐量预测方法,其基本思想是:首先根据机场季节旅客吞吐量历史数据的移动平均数,计算平均季节指数并进行修正,然后构建机场季节吞吐量趋势变动模型,从而构建航线季节客运需求分析模型。仿真结果表明该方法可行且结果具有较高的精度,可作为预测机场季节旅客吞吐量的有效工具。  相似文献   
148.
This paper examines the hypothesis that the timing of lockup expiration is crucial to earnings management (EM) behavior in the period after an initial public offering (IPO). Taiwan's unique two-stage lockup regulations make the Taiwanese sample an excellent candidate for examining this hypothesis. Three main results are reached. First, we find positive discretionary accruals (DAs) from the IPO quarter to the quarter after the expiration of the first-stage lockup. The DA in the quarter of the second-stage lockup expiration is significantly positive. The evidence shows that the lockup provision is key in the findings of significant EM in the IPO year and the following year. We also find a positive association between DAs in first-stage lockups and subsequent insider selling activity, indicating that insiders' selling after lockup expiration accounts for EM in the lockup period. Third, the extent of EM in first-stage lockup is negatively related to that around the IPO, consistent with the reversal nature of DAs.  相似文献   
149.
Five index derivatives with the same expiration days, settlement days, and settlement systems have been consecutively traded on the Taiwan Futures Exchange (TAIFEX) since 1998. This paper examines the expiration effects of TAIFEX index derivatives on the underlying stock market between 1998 and 2002. Our empirical findings show no significant expiration effects on the expiration day, but evidence demonstrates that expiration effects have strengthened as more relative index derivatives are listed on the TAIFEX. Meanwhile, the expiration effects seem to shift to the opening of the settlement day. In general, the expiration effects in Taiwan are not as significant as those in U.S. markets but are stronger than those in the Hong Kong market. The special settlement procedures adopted by the TAIFEX may account for the difference.  相似文献   
150.
This study empirically examines the short- and long-run dynamic causal linkages between Malaysia and its major trading partners (the United States, Japan, Singapore, China, and Thailand) based on a two-step estimation, Autoregressive distributed lag (ARDL) and Generalized Method of Moments (GMM) during the period 1992–2008. The study documents that the stronger the trade ties among the countries, the higher the degree of comovements among their stock markets. The Japanese stock market, to some extent, is found to be more important than the United States over these markets. In designing stock market policies, each country should take into consideration of any shocks in its major trading partners.  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