全文获取类型
收费全文 | 1357篇 |
免费 | 65篇 |
专业分类
财政金融 | 121篇 |
工业经济 | 129篇 |
计划管理 | 578篇 |
经济学 | 110篇 |
综合类 | 90篇 |
运输经济 | 9篇 |
旅游经济 | 13篇 |
贸易经济 | 130篇 |
农业经济 | 133篇 |
经济概况 | 109篇 |
出版年
2025年 | 6篇 |
2024年 | 29篇 |
2023年 | 25篇 |
2022年 | 34篇 |
2021年 | 38篇 |
2020年 | 40篇 |
2019年 | 25篇 |
2018年 | 28篇 |
2017年 | 36篇 |
2016年 | 33篇 |
2015年 | 72篇 |
2014年 | 153篇 |
2013年 | 124篇 |
2012年 | 154篇 |
2011年 | 156篇 |
2010年 | 95篇 |
2009年 | 76篇 |
2008年 | 53篇 |
2007年 | 57篇 |
2006年 | 41篇 |
2005年 | 40篇 |
2004年 | 29篇 |
2003年 | 23篇 |
2002年 | 16篇 |
2001年 | 13篇 |
2000年 | 8篇 |
1999年 | 4篇 |
1998年 | 3篇 |
1997年 | 7篇 |
1996年 | 1篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1993年 | 1篇 |
排序方式: 共有1422条查询结果,搜索用时 0 毫秒
11.
This article investigates the governance role of banks exercised through the replacement of underperforming CEOs in borrowing firms. An average level of bank loans outstanding implies a 22% to 47% increase in the forced turnover probability of a borrowing firm’s CEO if a firm’s industry adjusted performance is one standard deviation below average. This increase is much larger, 68% to 92%, when an underperforming firm violates its loan covenants. Overall, the paper’s findings suggest that banks play a key role in the governance of underperforming firms, especially when covenants are violated. 相似文献
12.
Monitoring is an important and costly activity in resource management problems such as containing invasive species, protecting endangered species, preventing soil erosion, and regulating contracts for environmental services. Recent studies have viewed optimal monitoring as a Partially Observable Markov Decision Process (POMDP), which provides a framework for sequential decision making under stochastic resource dynamics and uncertainty about the resource state. We present an overview of the POMDP framework and its applications to resource monitoring. We discuss the concept of the information content provided by monitoring systems and illustrate how information content affects optimal monitoring strategies. Finally, we demonstrate how the timing of monitoring in relation to resource treatment and transition can have substantial effects on optimal monitoring strategies. 相似文献
13.
高压开关柜是电力系统中极为重要的组成结构,对于电力系统的运行起到了通断、控制、保护的作用,避免了系统受到各种故障的影响而出现损坏。为了保持高压开关柜性能的发挥,对其触点温度实施监测控制可及时观察到可能发生的故障,采取措施后把故障损失控制在最小。文章分析了ZigBee技术在高压开关柜触点温度监测中的运用。 相似文献
14.
煤矿机电设备状态的监测与故障诊断可以有效的缓解此问题产生的频率、程度、及设备的故障率,可以增大煤炭企业的安全生产,减少机电事故。本文介绍了煤矿机电设备作业的特点、维修及对设备故障的提前预防的意义,特别强调了机电设备运行状态监测及故障诊断在煤矿安全生产中的应用、发展及不足之处。 相似文献
15.
对物联网技术进行了分析,并从物联网技术的角度对冷链物流的制冷系统进行了研究,对其系统设计方案以及涉及的关键技术等进行了介绍。 相似文献
16.
Yaron Azrieli 《Theoretical Economics》2021,16(4):1313-1350
We study the design of contracts that incentivize experts to collect information and truthfully report it to a decision maker. We depart from most of the previous literature by assuming that the transfers cannot depend on the realized state or on the ex post payoff of the decision maker. The contract thus has to induce the experts to “monitor each other” by making the transfers contingent on the entire vector of reports. We characterize the least costly contract that implements any given vector of efforts and derive the cost function for the decision maker. We then study properties of optimal contracts by comparing the value of information and its cost. 相似文献
17.
18.
污染场地现场调查与监测模式研究 总被引:1,自引:0,他引:1
污染场地调查与监测是场地环境管理、风险评估与修复治理的重要环节。文章介绍了国内外污染场地调查评估的阶段划分与勘察技术,分析了国内场地调查工作模式以及环境监测工作程序,提出了现有的常用监测技术,并总结了目前国内污染场地勘察与监测的研究现状。 相似文献
19.
Stéphane Roze William J. Valentine Mark Cook Manisha Jethwa Simona de Portu 《Journal of medical economics》2016,19(3):236-242
Aims/hypothesis:Continuous subcutaneous insulin infusion (CSII) is an important treatment option for type 1 diabetes patients unable to achieve adequate glycemic control with multiple daily injections (MDI). Combining CSII with continuous glucose monitoring (CGM) in sensor-augmented pump therapy (SAP) with a low glucose-suspend (LGS) feature may further improve glycemic control and reduce the frequency of hypoglycemia. A cost-effectiveness analysis of SAP?+?LGS vs CSII plus self-monitoring of blood glucose (SMBG) was performed to determine the health economic benefits of SAP?+?LGS in type 1 diabetes patients using CSII in the UK.Methods:Cost-effectiveness analysis was performed using the CORE diabetes model. Treatment effects were sourced from the literature, where SAP?+?LGS was associated with a projected HbA1c reduction of ?1.49% vs ?0.62% for CSII, and a reduced frequency of severe hypoglycemia. The time horizon was that of patient lifetimes; future costs and clinical outcomes were discounted at 3.5% and 1.5% per annum, respectively.Results:Projected outcomes showed that SAP?+?LGS was associated with higher mean quality-adjusted life expectancy (17.9 vs 14.9 quality-adjusted life years [QALYs], SAP?+?LGS vs CSII), and higher life expectancy (23.8 vs 21.9 years), but higher mean lifetime direct costs (GBP 125,559 vs GBP 88,991), leading to an incremental cost-effectiveness ratio (ICER) of GBP 12,233 per QALY gained for SAP?+?LGS vs CSII. Findings of the base-case analysis remained robust in sensitivity analyses.Conclusions/interpretation:For UK-based type 1 diabetes patients with poor glycemic control, the use of SAP?+?LGS is likely to be cost-effective compared with CSII plus SMBG. 相似文献
20.
Odd Godal Yuri Ermoliev Ger Klaassen Michael Obersteiner 《Environmental and Resource Economics》2003,25(2):151-169
The Kyoto Protocol foresees emission trading but does not yet specify verification of (uncertain) emissions. This paper analyses a setting in which parties can meet their emission targets by reducing emissions, by investing in monitoring (reducing uncertainty of emissions) or by (bilaterally) trading permits. We derive the optimality conditions and carry out various numerical simulations. Our applications suggest that including uncertainty could increase compliance costs for the USA, Japan and the European Union. Central Europe and the Former Soviet Union might be able to gain from trading due to higher permit prices. Emissions trading could also lower aggregate uncertainty on emissions. 相似文献