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   1936篇
  免费   57篇
财政金融   174篇
工业经济   404篇
计划管理   128篇
经济学   217篇
综合类   83篇
运输经济   20篇
旅游经济   110篇
贸易经济   460篇
农业经济   238篇
经济概况   159篇
  2024年   1篇
  2023年   18篇
  2022年   24篇
  2021年   54篇
  2020年   156篇
  2019年   67篇
  2018年   52篇
  2017年   103篇
  2016年   202篇
  2015年   50篇
  2014年   109篇
  2013年   155篇
  2012年   133篇
  2011年   177篇
  2010年   101篇
  2009年   99篇
  2008年   108篇
  2007年   101篇
  2006年   73篇
  2005年   50篇
  2004年   22篇
  2003年   24篇
  2002年   14篇
  2001年   19篇
  2000年   19篇
  1999年   14篇
  1998年   1篇
  1997年   1篇
  1996年   1篇
  1995年   1篇
  1994年   2篇
  1985年   8篇
  1984年   14篇
  1983年   12篇
  1982年   8篇
排序方式: 共有1993条查询结果,搜索用时 15 毫秒
111.
The use of genetically modified (GM) crop technology in tackling food security problems and poverty reduction in Africa continues to generate debates over its benefits and safety. Only four countries, South Africa, Sudan, Burkina Faso and Egypt have commercialized GM crops in Africa but controversy surrounds current cultivation of GM maize in Egypt. Our study provides new perspectives on the status, development and regulation of GM crops through examining the views of 305 stakeholders in six African countries across four regions: South Africa, Kenya (East Africa), Egypt and Tunisia (North Africa), Ghana and Nigeria (West Africa), supplemented by interviews with relevant international organizations. The study revealed the challenges leading to the development of biosafety regulatory frameworks and the role of individual stakeholders in the facilitation of GM crops across African countries. This study also revealed that some countries may go through a Fiber–Feed–Food (F3) approach to adopt GM crops where Bt cotton will be adopted first followed by GM crops for livestock feed while undergoing all the necessary assessments before producing GM foods for human consumption. An overwhelming majority of stakeholders placed emphasis on risk analysis (risk assessment and management) in view of limited capacity, lack of scientific expertise and public concern, and encouraged a centralized approach to risk assessment similar to the European Union model of the European Food Safety Authority (EFSA).  相似文献   
112.
Food environments are potential targets for interventions to reduce obesity prevalence, particularly in island settings that are typically dependent on food imports. This observational study aimed to characterise the availability, quality and price of foods and beverages in a nationally representative sample of grocery stores in Malta using the Nutrition Environment Measures Survey for Stores (NEMS-S) instrument, and to examine the association between area-level density of different types of food stores and the likelihood of children living in these areas being overweight or obese. Fieldwork was carried out between March and May 2014. There was a strong positive correlation between store size and NEMS-S score (p = <0.001), suggesting that smaller grocery stores generally offered a smaller range of products and fewer healthy food/beverage options than larger supermarkets. Across all stores, median prices of certain ‘healthier’ versions of foods were more expensive than their less healthy alternatives. A significant association between risk of childhood overweight, and density of confectionery stores in children’s locality of residence, was found (OR 1.19; 95% CI: 1.04, 1.37). These baseline findings highlight opportunities to improve the food environment in Malta to support more healthful eating, and may be of particular interest to public health practitioners in island settings.  相似文献   
113.
The 1981 reform of the Chilean pension system was revolutionary at its time. It was the first instance of a mature public Pay-As-You-Go social security system being converted into a mandatory defined contribution system managed by the private sector. This paper contends that a unique confluence of events were responsible for this change. The rise of a dictatorship in Chile, a struggling public retirement system, and a cadre of Chicago oriented economists determined to make Chile a model free market neoliberal economy. This was later followed by the Washington Consensus and the promotion of Chilean reform by the World Bank. This paper analyzes the Chilean reform and its subsequent development; evaluating it on both efficiency and equity grounds. While the evidence for efficiency gains is mixed there is little doubt that equity has suffered under the new system. Nevertheless, it continues to evolve and equity concerns are increasingly being addressed.  相似文献   
114.
本文对某注册进出口食品企业进行了为期6个月的动物源性食品原料志贺氏菌检测,样品包含5个品种共计180份,结果分离到1株可疑志贺氏菌,检出率为0.56%。经分离培养,革兰氏染色形态学观察,生化试验和血清学试验鉴定为福氏志贺氏菌,血清型为3a型。然后分析它们被污染的可能原因,并提出相应控制措施,为出口企业提产品品质、生产优质食品提供参考依据,确保出口食品的质量安全。  相似文献   
115.
In 2014/15, Universal Free School Meals (UFSM) were introduced in Scotland and England for children in their first three years of primary school. This study examined the implementation of UFSM in Scotland using Normalisation Process Theory (NPT), a middle-range theory of implementation, to identify areas of learning for policymakers wishing to introduce or extend similar policies. NPT is predominantly used to evaluate interventions or new technologies in healthcare settings. Qualitative data were collected across Scotland using a case study approach shortly after implementation (n = 29 school-level stakeholders) and in the following school year (n = 18 school-level stakeholders and n = 19 local authority-level stakeholders). Observations of lunchtime in each school were conducted at both timepoints. Data were analysed using a thematic framework approach using NPT constructs and sub-constructs. Results suggested education and catering stakeholders experiences of implementation diverged most around the NPT concepts of coherence, cognitive participation, and reflexive monitoring. Lack of coherence around the purpose and long-term benefits of UFSM appeared to reduce education stakeholders’ willingness to engage with the policy beyond operational issues. In contrast, catering stakeholders identified a direct benefit to their everyday work and described receiving additional resources to deliver the policy. Overall, participants described an absence of monitoring data around the areas of greatest salience for education stakeholders. This study successfully used NPT to identify policy learning around school meals. Policymakers must increase the salience of such intersectoral policies for all relevant stakeholders involved before policy implementation, and plan adequate monitoring to evaluate potential long-term benefits.  相似文献   
116.
郑辉 《特区经济》2011,(1):279-280
在对国民储蓄率的影响因素进行分析后,对经典的生命周期模型进行了拓展,引入了人口结构和社会保障两因素,从而构建了一个新的生命周期模型。在此基础上,对我国的国民储蓄率进行实证研究后发现,我国的人口结构确实会对国民储蓄率产生较显著的影响,而社会保障水平却对其影响不显著。  相似文献   
117.
目前中国的城镇发展迅速,极大的促进了我国经济建设和社会的全面发展。但是在城镇的消防基础设施方面还存在着很多的问题。因此本文结合城镇发展的现状,对城镇的消防安全进行合理的布局。  相似文献   
118.
根据食品行业岗位群的发展需要,结合高职院校培养技能型人才的实际要求,我们针对食品营养与检测专业的特点,构建了政校企合作"两平台三结合"教学做一体化的人才培养模式。  相似文献   
119.
Within a context of delivering food security into the future, dietary guidelines are being reframed, corporations are replacing unsustainable products, and consumers are being encouraged to become ecological citizens. While there is a growing literature on the food practices of ‘alternative’ consumers, ‘mainstream’ consumers are less well understood. This paper describes qualitative research undertaken in a socio-economically disadvantaged area of Sydney, Australia, which aimed to uncover consumer views towards sustainable and healthy diets. Most participants indicated a discrepancy between their desired and actual behaviours: while they want to support Australian, or local, food producers they gravitate towards cheap and tasty food from ‘anywhere’; and while they associate nutritious food with fresh food, they will buy processed foods which can be less expensive, appeal to children and are prone to less waste. Reflecting mainstream Australian political culture, participants were compromising household food budgets in order to pursue a socially acceptable standard of living (including decent housing, car-reliance). They were also incorporating the pleasure and desires of family members as part of ‘the moral arts of everyday life’. Using social theories of consumption and practice sociology we argue that food choices and practices – easy or not – need to be interpreted as part of the role that consumption plays in political citizenship and moral subjectivity. In the Western Sydney context, food practices are essentially household budget and family nourishment practices rather than nutrition and sustainability practices; a position which is not addressed in the government’s new food policies or wage determination processes.  相似文献   
120.
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