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   2603篇
  免费   99篇
财政金融   570篇
工业经济   222篇
计划管理   504篇
经济学   528篇
综合类   32篇
运输经济   39篇
旅游经济   101篇
贸易经济   427篇
农业经济   114篇
经济概况   163篇
邮电经济   2篇
  2023年   12篇
  2021年   24篇
  2020年   46篇
  2019年   58篇
  2018年   83篇
  2017年   79篇
  2016年   57篇
  2015年   47篇
  2014年   74篇
  2013年   343篇
  2012年   80篇
  2011年   64篇
  2010年   94篇
  2009年   92篇
  2008年   87篇
  2007年   87篇
  2006年   92篇
  2005年   72篇
  2004年   79篇
  2003年   69篇
  2002年   63篇
  2001年   53篇
  2000年   63篇
  1999年   77篇
  1998年   58篇
  1997年   48篇
  1996年   39篇
  1995年   48篇
  1994年   39篇
  1993年   34篇
  1992年   28篇
  1991年   35篇
  1990年   20篇
  1989年   20篇
  1988年   18篇
  1987年   29篇
  1986年   19篇
  1985年   40篇
  1984年   37篇
  1983年   40篇
  1982年   29篇
  1981年   20篇
  1980年   29篇
  1979年   24篇
  1978年   25篇
  1977年   19篇
  1976年   13篇
  1974年   17篇
  1973年   13篇
  1972年   11篇
排序方式: 共有2702条查询结果,搜索用时 31 毫秒
91.
92.
93.
94.
This article examines how behavioral economics can be used to improve the spending decisions of retirees, using a SPEEDOMETER (or Spending Optimally Throughout Retirement) retirement expenditure plan that employs defaults within a choice architecture. The plan involves just four key behavioral nudges: (1) first, make a plan—ideally by being auto‐enrolled into one or with the help of a financial adviser; (2) automatic phasing of annuitization, which is designed to tackle the aversion to large irreversible transactions and losing control of assets, and so allows the greatest possible degree of flexibility in managing the rundown of retirement assets; (3) capital protection in the form of “money‐back” annuities that deals with loss aversion, that is, the fear of losing your money if you die early; and (4) the slogan “spend more today safely” that utilizes hyperbolic discounting to satisfy the human trait of wanting jam today, and to reinforce the idea that “buying an annuity is a smart thing to do.”  相似文献   
95.
Utilizing a convenience sample of 305 professional staff from seven public accounting firms, this study examined: a) the factor structure of the Perceived Stress Scale-10 (PSS10; Cohen & Williamson, 1988); b) the invariance of its factor structure; c) the scale's reliability; and, d) its convergent and divergent validity. Our analyses support a structure with two primary factors, (General Distress and Ability-to-Cope), which load on a single second order factor, Perceived Stress, regardless of gender. Spearman–Brown reliability coefficients, item-total correlations, and coefficient alphas each supported the reliability of the items loading on the full scale as well as on each of the two primary factors. Collectively, these findings provide compelling evidence in support of the PSS10 as a perceived stress measure for accounting professionals. However, more research is warranted to investigate the efficacy of a reduced six-item version of the instrument.  相似文献   
96.
97.
Uniform customer‐class pricing can do much of the work of congestion‐based or time‐of‐day pricing in communication or wireless networks. A monopolist exploits differences in the stochastic characteristics of demands. If demands are correlated and the firm faces a capacity constraint, then it can set prices to reduce the variability of aggregate demand, thereby reducing the probability of excess demand and the associated service quality deterioration. Demands that covary negatively with aggregate demand are valuable to the firm in much the same way that securities that covary negatively with the market are valuable in a stock portfolio. Customer classes that exhibit low covariance with aggregate demand realize lower optimal prices. Optimal capacity is also affected by these covariances. As long as demands are not perfectly positively correlated, expected costs of joint production are less than expected costs of serving demands separately.  相似文献   
98.
Providing nutritious and environmentally sustainable food to all people at all times is one of the greatest challenges currently facing society. This problem is particularly acute in Africa where an estimated one in four people still lack adequate food to sustain an active and healthy life. In this study, we consider the potential impact of future population growth and climate change on food security in Africa, looking ahead to 2050. A modelling framework termed FEEDME (Food Estimation and Export for Diet and Malnutrition Evaluation) was used which was characterized to model the impacts of future climate changes (utilizing the Intergovernmental Panel on Climate Change Special Report on Emissions Scenarios projections) and projected population growth on food availability and subsequent undernourishment prevalence in 44 African countries. Our results indicate that projected rapid population growth will be the leading cause of food insecurity and widespread undernourishment across Africa. Very little to no difference in undernourishment projections were found when we examined future scenarios with and without the effects of climate change, suggesting population growth is the dominant driver of change. Various adaptation options are discussed, such as closing the yield gap via sustainable intensification and increasing imports through trade and aid agreements. These strategies are likely to be critical in preventing catastrophic future food insecurity.  相似文献   
99.
Protected areas are key to the conservation of global biodiversity and ecosystem services; however, their success is contingent upon adequate funding. One possibility to increase funding for park management is to “sell” a wider suite of ecosystem services “produced” by protected areas, such as carbon sequestration. We conducted 420 tourist surveys to analyze willingness to pay (WTP) for ecosystem service benefits via a conservation fee in the Tambopata National Reserve in Peru. We also interviewed eight tour operators about their perceptions of the proposed fee. The average stated WTP was 15 USD. Sixty-six percent of tourists stated they would pay 10 USD or more, which, if actually paid, would have resulted in 318,000 USD for park management in 2015. Most respondents stated they would pay an additional fee if it supported biodiversity conservation or local ecosystem services, such as water, but less than 10% of tourists were motivated by carbon sequestration as a reason to pay the fee. Most tour operators supported the additional fee. Our findings suggest that tourists are willing to pay higher fees to support conservation but that interest in paying for additional ecosystem services from parks may not extend to global and intangible benefits such as carbon sequestration.  相似文献   
100.
In recent years, a growing number of small-to-medium-enterprises are embracing wind turbine projects not only as part of their cost reduction strategy but also to actively play their part in the global fight against climate change. However, it would appear there are currently limited empirical studies carried out in this emerging industry. This case study analyses the cost effectiveness of one such wind turbine initiative by a company in the Republic of Ireland, who invested in a 300 kW embedded wind turbine project at the end of 2013. The research methodology which is primarily a case study analysis included comparing historical electricity utility bills which allowed the 2013 quantity of electrical energy units imported, i.e. the year before the turbine was installed to be compared with the 2014 value, i.e. the year after the turbine was installed. Numerous site visits were undertaken over a four-year period, during which electric meter readings were recorded and stored. The findings of this piece of research indicate that the installation of the embedded wind turbine had minimal positive effect on the annual electricity costs for the company. Indeed the turbine appears to have significant negative effects such as a need for an increased maximum import capacity and also it appeared to contribute to a deteriorating utility power factor. While the aesthetic nature of the on-site turbine seemed to create a positive image of the company, it would appear that caution should be exercised when business owners select alternative energy providers who claim to be experts in the energy field but may have limited knowledge in this area of wind energy, which as of yet has minimal robust research into all aspects of its benefits/attributes.  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