全文获取类型
收费全文 | 4446篇 |
免费 | 171篇 |
国内免费 | 49篇 |
专业分类
财政金融 | 393篇 |
工业经济 | 225篇 |
计划管理 | 878篇 |
经济学 | 634篇 |
综合类 | 704篇 |
运输经济 | 28篇 |
旅游经济 | 37篇 |
贸易经济 | 597篇 |
农业经济 | 521篇 |
经济概况 | 649篇 |
出版年
2024年 | 13篇 |
2023年 | 44篇 |
2022年 | 62篇 |
2021年 | 85篇 |
2020年 | 137篇 |
2019年 | 89篇 |
2018年 | 58篇 |
2017年 | 104篇 |
2016年 | 117篇 |
2015年 | 147篇 |
2014年 | 331篇 |
2013年 | 318篇 |
2012年 | 412篇 |
2011年 | 532篇 |
2010年 | 387篇 |
2009年 | 299篇 |
2008年 | 346篇 |
2007年 | 274篇 |
2006年 | 251篇 |
2005年 | 194篇 |
2004年 | 134篇 |
2003年 | 104篇 |
2002年 | 67篇 |
2001年 | 58篇 |
2000年 | 38篇 |
1999年 | 17篇 |
1998年 | 10篇 |
1997年 | 9篇 |
1996年 | 8篇 |
1995年 | 4篇 |
1994年 | 2篇 |
1993年 | 2篇 |
1992年 | 1篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1986年 | 2篇 |
1984年 | 5篇 |
1983年 | 2篇 |
1982年 | 1篇 |
排序方式: 共有4666条查询结果,搜索用时 343 毫秒
71.
我国石油企业跨国经营战略的探讨 总被引:5,自引:0,他引:5
石油企业走出国门,实施跨国经营,是解决我国国内油气资源供求矛盾加剧的必然选择,也是维护和保障我国石油安全乃至国家经济安全的必由之路。文章探讨了我国石油企业国际化经营的必然性及其动因,进一步分析了目前我国石油企业国际化经营的发展现状,在此基础上提出了我国三大石油集团实施“走出去”战略的八项对策。 相似文献
72.
Information security management plays an essential role for drawing the roadmap of information security; thus, many theoretical methodologies and practical standards are brought into this domain. However, many standards and methodologies are too cumbersome to be adopted by an organization. Additionally, there is no unified framework to systematically handle the tedious tasks of information security management. This study’s primary goal is to design an integrated system for information security management (ISISM) that aims to use current methodologies and standards to solve the above-mentioned issues. Because business impact analysis and risk analysis are the most important areas within this domain, we carefully select the related methods and then integrate them into a unified framework, upon which the proposed ISISM depends. To achieve this outcome for this study, security requirement engineering is adopted, which enables the designed system to support system users in generating risk assessment reports with related information security policies. 相似文献
73.
The impact of population growth and climate change on food security in Africa: looking ahead to 2050
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
74.
75.
针对近几年施工企业安全形势严峻,安全管理急需转型的形势完成本文。本文通过对企业安全管理的内部能力与外部因素运用SWOT分析,阐述了施工企业安全管理战略从过去突击式的安全大检查到以预防为主的危险源辨识管控的转变。 相似文献
76.
高职烹饪工艺与营养专业人才培养研究已成为餐饮管理与服务类教学改革研究的焦点问题。本文就高职教育烹饪工艺与营养专业的定位、人才培养、教学等诸方面分析,将对专业存在的问题进行分析,提出解决的措施及教学方法改革方面的建议。 相似文献
77.
《Food Policy》2016
Personalised diets based on people’s existing food choices, and/or phenotypic, and/or genetic information hold potential to improve public dietary-related health. The aim of this analysis, therefore, has been to examine the degree to which factors which determine uptake of personalised nutrition vary between EU countries to better target policies to encourage uptake, and optimise the health benefits of personalised nutrition technology. A questionnaire developed from previous qualitative research was used to survey nationally representative samples from 9 EU countries (N = 9381). Perceived barriers to the uptake of personalised nutrition comprised three factors (data protection; the eating context; and, societal acceptance). Trust in sources of information comprised four factors (commerce and media; practitioners; government; family and, friends). Benefits comprised a single factor. Analysis of Variance (ANOVA) was employed to compare differences in responses between the United Kingdom; Ireland; Portugal; Poland; Norway; the Netherlands; Germany; and, Spain. The results indicated that respondents in Greece, Poland, Ireland, Portugal and Spain, rated the benefits of personalised nutrition highest, suggesting a particular readiness in these countries to adopt personalised nutrition interventions. Greek participants were more likely to perceive the social context of eating as a barrier to adoption of personalised nutrition, implying a need for support in negotiating social situations while on a prescribed diet. Those in Spain, Germany, Portugal and Poland scored highest on perceived barriers related to data protection. Government was more trusted than commerce to deliver and provide information on personalised nutrition overall. This was particularly the case in Ireland, Portugal and Greece, indicating an imperative to build trust, particularly in the ability of commercial service providers to deliver personalised dietary regimes effectively in these countries. These findings, obtained from a nationally representative sample of EU citizens, imply that a parallel, integrated, public-private delivery system would capture the needs of most potential consumers. 相似文献
78.
In the 1990s, the Democratic People’s Republic of Korea (North Korea) suffered from severe food shortages and large-scale deforestation, which triggered a stage of rural conservation reform. Since 2004, with support from the Swiss Agency for Development and Cooperation (SDC), North Korea’s Ministry of Land and Environmental Protection (MoLEP) has implemented a Sloping Land Management Program (SLMP). The SLMP established sloping land user groups and granted these groups the right to use marginal land for agroforestry development. This devolution of land rights from state control onto local groups is a landmark in North Korea, and this decentralization initiative has now expanded to over eight counties to involve thousands of households. It has also led to the launch of a National Agroforestry Policy and Strategy. Drawing from both qualitative and quantitative data collected from 2008 to 2014, this paper documents the process and effects of the SLMP. It argues that the decentralization reform in land management has contributed to not only food security with increased food crop diversity and productivity, but also notably forest recovery through an expansion of tree plantations and agroforestry practices on degraded sloping lands. However, an insufficient power transfer in the form of a lack of timber rights granted to the local user groups has hampered the effectiveness of the SLMP. There are also institutional and geopolitical challenges that are limiting further scaling-up of land-use decentralization across the country. The policy implication calls for more international investment as well as national land-use policy reforms in order to promote and facilitate further decentralization of sloping land management and to secure greater use rights for sloping land user groups. 相似文献
79.
Shortfalls in global food production, coupled with the growing visibility of climate change's disruptive effects, have underlined for many observers the importance of devoting rural lands to their ‘optimal’ use, where they can make maximal contributions to the global imperatives of feeding the human population and maintaining vital environmental services. In this context observers have endorsed rural land use planning as a way to insure that, at least in theory, lands get devoted to their best uses. In practice, land use planning in the developing world has resembled ‘organized anarchy’. Small landholders with insecure land tenure, overseas investors seeking large land deals, NGOs representing indigenous peoples, government officials, and staff from international environmental NGOs and multilateral organizations have come together in strategic action fields to struggle over and sometimes negotiate land use plans for contested landscapes. These plans represent a strategic, spatially explicit response to the climate change–biodiversity–food security crisis. 相似文献
80.
移动电子商务带来便利的同时也带来了新的安全问题,设备的多样性和移动网络环境的复杂性使得确保移动电子商务交易安全更加困难,本文通过分析现阶段移动电子商务的交易模式,提出现有移动电子商务交易过程中存在的安全问题与安全隐患,最后提出了较为可行的解决方案。 相似文献