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   2876篇
  免费   91篇
财政金融   626篇
工业经济   191篇
计划管理   455篇
经济学   608篇
综合类   51篇
运输经济   14篇
旅游经济   45篇
贸易经济   614篇
农业经济   90篇
经济概况   273篇
  2023年   25篇
  2021年   28篇
  2020年   49篇
  2019年   66篇
  2018年   66篇
  2017年   72篇
  2016年   80篇
  2015年   45篇
  2014年   73篇
  2013年   296篇
  2012年   83篇
  2011年   97篇
  2010年   92篇
  2009年   90篇
  2008年   84篇
  2007年   108篇
  2006年   91篇
  2005年   78篇
  2004年   76篇
  2003年   72篇
  2002年   81篇
  2001年   56篇
  2000年   55篇
  1999年   67篇
  1998年   63篇
  1997年   38篇
  1996年   53篇
  1995年   54篇
  1994年   48篇
  1993年   23篇
  1992年   41篇
  1991年   39篇
  1990年   28篇
  1989年   33篇
  1988年   23篇
  1986年   26篇
  1985年   57篇
  1984年   46篇
  1983年   44篇
  1982年   38篇
  1981年   32篇
  1980年   37篇
  1979年   38篇
  1978年   33篇
  1977年   34篇
  1976年   25篇
  1975年   26篇
  1974年   33篇
  1973年   16篇
  1972年   16篇
排序方式: 共有2967条查询结果,搜索用时 15 毫秒
121.
For many years, researchers and practitioners have sought out meaningful indicators of sales performance. Yet, as the concept of performance has broadened, the understanding of what makes up a successful seller, has become far more complicated. The complexity of buyer–seller relationships has changed therefore as the definition of sales performance has expanded, cultivating a growing interest in ethical/unethical actions since they could potentially have impacts on sales performance. Given this environment, the purpose of this study is to explore the impact of moral judgment on sales performance and sellers engaging in a customer-oriented selling approach. Specifically, by utilizing a sample of 345 business-to-business salespeople, this study examines the relationships between moral judgment, customer-oriented selling, and outcome and behavior based performance. Results, managerial implications, and opportunities for future research are provided.  相似文献   
122.
123.
A meta-analysis is used to demonstrate the ineffectiveness of subliminal advertising to influence the consumer's decision between alternatives. A review of narrative reviews is provided to illustrate that sample size and effect size is seldom used as the basis for evaluating whether subliminal marketing stimuli are an effective means for influencing consumer choice behavior. The results of the meta-analysis indicate that there is very little effect. The resulting coefficient had a value r=0.0585, which places the effectiveness of subliminal advertising on choice between the impact of aspirin on heart attacks and the relationship between alcohol abuse and a tour of duty in Vietnam (Rosenthal, 1990). © 1996 John Wiley & Sons, Inc.  相似文献   
124.
使比较研究可信   总被引:1,自引:0,他引:1  
:人们在进行宏观社会现象的研究时,方法上有定性与定量之分。定量分析呈现U字形分布,对极少量的N进行研究有案例分析导向,对极大量的N进行研究不利于认识的深化,因此有必要寻找案例研究与变量导向研究之间的中间路线。组合式研究就有很多独特的优点。  相似文献   
125.
The behavior of an open system is modeled. Thus, for special cases, the void fraction is predicted as a function of location and time. The open system may be an open vessel or a vessel with an open relief device. A single governing equation is derived based on combining the material and energy balances with the churn-turbulent drift flux relationship and assuming no radial gradients. This partial differential equation is not solved. It is, however, bounded by homogeneous and all vapor venting. These special cases are solved. In homogeneous venting the key variable is time. In all vapor venting under pseudo-steady-state conditions the key variable is location. The solution of the partial differential equation is also discussed. Under pseudo-steady-state and churn-turbulent conditions, the open system is modeled. The minimum void fractions (corresponding to a maximum liquid inventory) with all vapor venting, for vertical, horizontal, and spherical vessels are predicted and compared. Analytical expressions for the local and average void fractions in a vertical vessel and non-unity distribution parameters are presented. Void fraction profiles are compared for three cases: 1. vertical cylinders with distribution parameters (Co values) of unity and 1.5, 2. horizontal and vertical cylinders with varying L/D ratios, and 3. spheres with inscribed vertical cylinders having constant gas production to bubble rise ratio (Ψ′ value). The vertical cylinder average void fraction for non-unity distribution parameters can now be calculated analytically. The horizontal cylinder average void fraction predicted by turning it upright results in an over prediction of at most 4%. The sphere average void fraction predicted via an inscribed vertical cylinder, with the same Ψ′ value, is consistenly high by at most 8%.  相似文献   
126.
This article evaluates irrigated agriculture sector response and resultant economic impacts of climate change for a part of the Murray Darling Basin in Australia. A water balance model is used to predict reduced basin inflows for mild, moderate and severe climate change scenarios involving 1, 2 and 4°C warming, and predict 13, 38 and 63% reduced inflows. Impact on irrigated agricultural production and profitability are estimated with a mathematical programming model using a two‐stage approach that simultaneously estimates short and long‐run adjustments. The model accounts for a range of adaptive responses including: deficit irrigation, temporarily following of some areas, permanently reducing the irrigated area and changing the mix of crops. The results suggest that relatively low cost adaptation strategies are available for a moderate reduction in water availability and thus costs of such a reduction are likely to be relatively small. In more severe climate change scenarios greater costs are estimated. Adaptations predicted include a reduction in total area irrigated and investments in efficient irrigation. A shift away from perennial to annual crops is also predicted as the latter can be managed more profitably when water allocations in some years are very low.  相似文献   
127.
There is little doubt that Brexit would have significant implications for UK agriculture, a sector with strong trade links to the EU and strong reliance on CAP income support. This article reports preliminary results from employing a Computable General Equilibrium Model, a Partial Equilibrium Model and Farm Level Models to explore selected trade and domestic policy scenarios post‐Brexit. These allow for the estimation of changes in producer prices, production and farm incomes against a baseline scenario of continued EU membership. Under a Free Trade Agreement with the EU, agricultural impacts are relatively modest. By contrast, unilateral removal of import tariffs has significant negative impacts on prices, production and incomes. Adoption of the EU's WTO tariff schedule for all imports favours net importers (e.g. dairy) and harms net exporters (e.g. sheep). Given the strong dependence of most UK farms on direct payments, their removal worsens negative impacts of new trade arrangements and offsets positive impacts. Impacts vary across different types and sizes of farm, but also regionally. However, the period of adjustment to new trade and domestic policy conditions may prove very challenging for a large number of farm businesses.  相似文献   
128.
Childhood drowning remains a serious public health problem worldwide. The Australian Water Safety Council has set as one of its highest priorities the reduction of drowning deaths in children aged 0–14 years. However, concerns have recently been raised that many students completing primary school still lack the ability to recognize potential aquatic risks, cope with emergencies or assist someone else in danger. In this study, 107 primary school children aged 11–12 completed a one day training programme led by surf lifesaving instructors. Pre, post and eight week follow-up measures showed statistically significant improvements in recognition of the red ‘beach closed’ flag, aquatic safety signs, how to identify a rip current and choosing the safest place to swim at a beach that included a rip current in the picture. Following training students were more willing to provide first aid assistance to family members and friends in an emergency situation. Findings reinforce the value of school-based training that provides a general foundation for aquatic safety, with the caveat that current programmes must be evaluated to ensure their content has a robust prevention focus.  相似文献   
129.
Aflatoxins are a common health hazard in tropical countries, especially in rural areas. New methods to reduce aflatoxin levels in food staples, as well as cheaper test methods, are being developed, but consumers’ willingness to pay (WTP) for these improvements is unknown. A survey was conducted with a representative sample of rural consumers (1,344 in total, 63% women) in all major maize‐production zones of Kenya. The survey included an experimental auction with maize products of different qualities. The results showed that many rural consumers were aware of aflatoxins, but few understood their health risks. Respondents were willing to pay a premium for maize tested for aflatoxins and labeled, but asked a high discount for maize that was visibly contaminated with moldy grain. The premium was higher for respondents with education and in regions with aflatoxicosis outbreaks. Knowledge of aflatoxins substantially reduced the overall WTP, but did not increase the WTP for tested maize. Welfare analysis indicates that mandatory testing would result in substantial benefits if the cost of testing can be lowered to below the premium.  相似文献   
130.
This study measures the economic impact of the first phase of the Cocoa Livelihood Program (CLP‐I), a current World Cocoa Foundation (WCF) project, sponsored by the Bill and Melinda Gates Foundation and aimed at improving the livelihood of over 200,000 small cocoa producers in sub‐Saharan Africa via training, crop diversification, and farmer‐based organizations. Using data collected from 2,048 pre‐ and post‐CLP‐I interviews of cocoa producers in Ghana, Cote d'Ivoire, Nigeria, and Cameroon, the results show that yield enhancements attributable to CLP‐I are 32%, 34%, 50%, and 62% in Ghana, Côte d'Ivoire, Nigeria, and Cameroon, respectively. Using a total program cost of $151–$200 per beneficiary and estimated annual benefits of $109–$322 per beneficiary over 25 years, the benefit‐cost ratios are estimated to range from $18 to $62 for every dollar spent on human capital development. These results suggest the WCF should endeavor to increase the number of farmers who receive all, not some, of the components of the program. This would not only help ensure that each producer obtains as much human capital as possible from each of the training programs but increases the probability of reaching the CLP goal of doubling the income of cocoa‐growing households.  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