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   1488篇
  免费   90篇
  国内免费   7篇
财政金融   15篇
工业经济   75篇
计划管理   225篇
经济学   342篇
综合类   89篇
运输经济   8篇
旅游经济   17篇
贸易经济   74篇
农业经济   530篇
经济概况   210篇
  2024年   1篇
  2023年   20篇
  2022年   27篇
  2021年   30篇
  2020年   46篇
  2019年   39篇
  2018年   39篇
  2017年   43篇
  2016年   47篇
  2015年   45篇
  2014年   78篇
  2013年   148篇
  2012年   87篇
  2011年   118篇
  2010年   110篇
  2009年   64篇
  2008年   66篇
  2007年   100篇
  2006年   85篇
  2005年   82篇
  2004年   51篇
  2003年   59篇
  2002年   53篇
  2001年   48篇
  2000年   32篇
  1999年   23篇
  1998年   9篇
  1997年   4篇
  1996年   5篇
  1995年   19篇
  1994年   1篇
  1993年   4篇
  1990年   1篇
  1984年   1篇
排序方式: 共有1585条查询结果,搜索用时 15 毫秒
1.
面源污染视角下江西省耕地利用效率研究   总被引:1,自引:0,他引:1  
[目的]在面源污染视角下考察耕地利用效率,可以为推动耕地可持续利用提供理论和参考依据。[方法]文章基于2000—2014年我国13个粮食主产省(区)耕地投入产出的面板数据,运用SBM方向性距离函数将耕地面源污染因素纳入到传统的效率分析框架,从省际比较的维度对江西省耕地利用效率进行了测度与分析。[结果]考虑面源污染因素对耕地利用效率测算产生了一定的影响;江西省耕地利用效率值呈现阶段性特征,耕地利用效率排名比较稳定,近年来排名有上升趋势;江西省耕地利用绩效一般,且与最佳实践者存在较大的差距。[结论]忽视面源污染因素的耕地利用效率评估是失真和不符合实际的,宜将面源污染因素纳入到耕地利用效率的测度框架,以此来更科学地量化评估耕地利用绩效;设计和完善相关政策,以有效控制耕地面源污染;加强与先进省(区)的交流与合作,学习其农业可持续耕作技术与管理经验,进一步推动江西省耕地产出与资源、环境协调发展。  相似文献   
2.
Using the workweek of capital as a measure of capital utilization, we empirically test whether news shocks actually increase capital utilization. To this end, by estimating a panel VAR on two-digit manufacturing data identifying news shocks as innovations to stock returns orthogonal to the variations in current-period TFP growth, we find the positive response of capital utilization to news shocks. Moreover, to explain the positive response of capital utilization to news shocks in terms of plant-level investment behavior, we propose a heterogeneous plant model that combines the fixed cost of capital adjustment and an endogenous capital utilization choice. With the presence of fixed costs, except for the plants that have recently adjusted capital stock, news shock shortens the effective time horizon of currently installed capital stock and increases capital utilization. When the model economy is calibrated to match the salient features of the plant-level investment rate distribution, the economy generates a news-driven positive response of capital utilization.  相似文献   
3.
This study investigates the importance of mindfulness‐based organization systems and policies on the organization's continuous efforts to become a greener company. The study is devised as a pooled cross‐sectional time series analysis of productivity in energy consumption, water utilization, and waste generation and recycling of U.S. companies. The data set taken from U.S. Newsweek 500 recorded 600 companies dispersed into 63 industries during the period of 2012–2014 and provided 1,498 company–industry–year observations. The study found that systems and policies (e.g., deployment of third‐party auditors for its environmental metrics report; linkage of the remuneration of company's senior executive team with the achievement of environmental performance targets; and establishment of a committee at the Board of Directors' level whose mandate includes sustainability of the company in environment‐ and resource‐related matters) connect the company's mindfulness to its effort in improving the environmental quality through the company's productivity in energy consumption, water utilization, and waste generation and recycling. The relationships are positive and significant. Also, systems and policies serve as a motivator for the firm to continue to improve upon the current achievements. The study emphasizes the importance of translating organizational and individual mindfulness into organization policies and systems in order to motivate the organization to continuously improve its productivity in energy consumption, water utilization, and waste generation and recycling leading to improvements in environmental quality.  相似文献   
4.
以北部湾城市群为例用三维生态足迹模型、偏最小二乘法、空间计量模型分析了其自然资本利用状况、空间相关性、驱动因素。结论:(1)城市群自然资本利用处于不可持续状态;(2)自然资本利用程度划分为低、中、高三类,城市也相应分成三类;(3)自然资本利用的主要驱动因素是人口因素、社会经济;(4)空间分析显示全局莫兰指数为正,空间集聚显著,表明自然资本利用存在空间正相关;空间误差模型拟合度最好,并证明自然资本存量占用与人口总量正相关,与GDP总额负相关。  相似文献   
5.
This study contributes to the understanding of the consumer’s ability to distinguish levels of quality of a product comparing it to an objective evaluation. Also, it was hypothesized that a higher level of education would lead to a better ability to discriminate quality. Perceived and objective quality are compared using a semi-experimental design with subjects evaluating coffee attributes. Objective values are provided by certified expert coffee cuppers, whereas perceived values are obtained from regular coffee drinkers. Results suggest that the importance placed on each attribute (aroma, flavour, body, and residual flavour) by the consumer is different from that placed on each attribute by the experts. Furthermore, the most relevant attribute for the consumer (flavour) is distinct from the one most relevant for experts (residual flavour). Additionally, the consumer is unable to distinguish quality levels as an expert can do, regardless of his education level.  相似文献   
6.
[目的]基于地方普遍反映低效工业用地利用量最大,程度最重的问题,文章将探寻城镇低效工业用地认定和查询的新方法,为地方政府科学化、层次化管理工业用地提供帮助,更好地促进土地资源的集约节约利用。[方法]基于多层级指标体系,以企业基础设施完备度为控制轴,企业经济效益和社会效益为评价轴,构建工业用地三维认定查询模型,创新工业用地的结果查询模式。[结果]以山西省榆社县为例,采用多层级指标体系能够得出,越是规模以上企业,其基础设施越完备、经济效益和社会效益分值越高,从侧面也可以反映出来地均税收和地均产值是造成该宗地高效利用和低效利用的关键。[结论]采用多层级指标体系确定的低效工业用地于与《山西省城镇低效用地编制要点》中确定的低效工业用地一致。且多层级指标体系不仅能将工业用地划分为高效利用、一般利用、低效利用、极差利用4个层次,还能对每个层级的分数进行比较,从而找出低效用地产生的原因,更好地指导地方政府对于工业用地的差异化管理和再开发工作。  相似文献   
7.
8.
Aims: To assess incremental charges of patients experiencing venous thromboembolisms (VTE) across various types of elective inpatient surgical procedures with administration of general anesthesia in the US.

Methods: The authors performed a retrospective study utilizing data from a nationwide hospital operational records database from July 2014 through June 2015 to compare a group of inpatients experiencing a VTE event post-operatively to a propensity score matched group of inpatients who did not experience a VTE. Patients included in the analysis had a hospital admission for an elective inpatient surgical procedure with the use of general anesthesia. Procedures of the heart, brain, lungs, and obstetrical procedures were excluded, as these procedures often require a scheduled ICU stay post-operatively. Outcomes examined included VTE events during hospitalization, length of stay, unscheduled ICU transfers, number of days spent in the ICU if transferred, 3- and 30-day re-admissions, and total hospital charges incurred.

Results: The study included 17,727 patients undergoing elective inpatient surgical procedures. Of these, 36 patients who experienced a VTE event were matched to 108 patients who did not. VTE events occurred in 0.2% of the study population, with most events occurring for patients undergoing total knee replacement. VTE patients had a mean total hospital charge of $60,814 vs $48,325 for non-VTE patients, resulting in a mean incremental charge of $11,979 (p?<?.05). Compared to non-VTE patients, VTE patients had longer length of stay (5.9 days vs 3.7 days, p?<?.001), experienced a higher rate of 3-day re-admissions (3 vs 0 patients) and 30-day re-admissions (7 vs 2 patients).

Conclusions: Patients undergoing elective inpatient surgical procedures with general anesthesia who had a VTE event during their primary hospitalization had a significantly longer length of stay and significantly higher total hospital charges than comparable patients without a VTE event.  相似文献   
9.
以长春市为研究对象,基于未来经济处于新常态的发展态势,构建包含水资源、社会、经济、生态环境4个子系统的评价指标体系,并确定各指标的评价等级标准;基于模糊数学理论以及层次分析法构建包括目标层、准则层、指标层的3层模糊综合评价模型,以2015年为现状水平年,应用模型对长春市水资源开发利用潜力进行综合评价。结果表明:长春市水资源开发利用程度处于中等偏上水平,各辖区水资源开发利用规模不平衡,可通过产业结构调整提高全市用水效率,为经济持续增长提供保障。  相似文献   
10.
Abstract

The article discusses the Sraffian Supermultiplier (SSM) approach to growth and distribution. It makes 5 points. First, in the short run, the role of autonomous expenditure can be appreciated within a standard post Keynesian framework (Kaleckian, Kaldorian, Robinsonian, etc.). Second, and related to the first, the SSM model is a model of the long run and has to be evaluated as such. Third, in the long run, one way that capacity adjusts to demand is through an endogenous adjustment of the rate of utilization. Fourth, the SSM model is a peculiar way to reach what Garegnani called the “second Keynesian position.” Although, it respects the letter of the “Keynesian hypothesis,” it makes investment quasi-endogenous and subjects it to the growth of autonomous expenditure. Fifth, in the long run it is unlikely that “autonomous expenditure” is really autonomous. From a stock-flow consistent point of view this implies unrealistic adjustments after periods of changes in stock-flow ratios. Moreover, if we were to take this kind of adjustment at face value, there would be no space for Minskyan financial cycles. This also creates serious problems for the empirical validation of the model.  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