我国长期定位施肥试验与农业可持续生产   总被引：1，自引：0，他引：1  

徐明岗  周世伟  张文菊  卢昌艾 《中国科学院院刊》2015,30(Z1):141-149

土壤肥料长期定位试验能揭示农业生态系统长期的变化趋势, 对探索农业可持续性有重要的指导意义。文章在简述我国农田土壤肥料长期试验网络基础上, 从土壤有机质演变、作物产量变化、土壤酸化机制、土壤生态功能演变以及施肥的环境效应等方面, 详细阐述了30 余年长期试验所取得的成果, 并对存在的问题进行剖析和展望未来发展, 以期推动我国土壤质量特别是土壤肥力演变研究, 提升国家耕地质量和农业生产可持续性。  相似文献   

Acquisition and Management of Digital Content at the Library of Congress     

Ted Westervelt 《期刊图书馆员》2015,68(1-4):269-273

The Library of Congress has been actively building digital content within its collection for some years now. This article addresses this digital collection building, covering both the technical means and the practical results. It discusses the underlying philosophies that are guiding the Library of Congress and identifies the areas in which the Library wishes to expand its operations along with the key questions it faces currently in meeting this goal. Finally, it seeks to share the lessons it has learned in the process.  相似文献   

How much exercise are older adults living in nursing homes doing in daily life? A cross-sectional study     

Philipe De Souto Barreto  Laurent Demougeot  Bruno Vellas  Yves Rolland 《Journal of sports sciences》2015,33(2):116-124

Information on the amount of exercise practised by nursing home (NH) residents is scarce. This study aimed at describing NH residents’ participation in exercise classes, as well as to examine whether the presence of a professional exercise instructor in the facilities is associated with residents’ exercise habits. The cross-sectional data of 5402 residents (median age = 88 years; mostly women (75.2%)) from 163 NHs in France were analysed. Adjusted logistic and linear regressions were performed to examine whether the presence of a professional exercise instructor in the NH was associated with exercise habits: exercise participation, frequency, duration, and levels. From the 5402 participants, 1914 were participating in exercise classes provided in the NH. Most of them had an exercise frequency of 1x/week or less. Median duration of exercise sessions was 45 min. Exercise levels were rated as: highly active (n = 487), intermediately active (n = 1096), and poorly active (n = 331). The presence of a professional exercise instructor working in the facility was significantly associated with exercise participation and with higher exercise frequencies and levels, and session duration. In conclusion, the presence of professional exercise instructors is associated with better exercise habits in NH residents. Improved exercise habits may potentially be translated into better health in this population.  相似文献   

A Strategy for the Management,Preservation, and Reutilization of Geographical Information Based on the Lifecycle of Geospatial Data: An Assessment and a Proposal Based on Experiences from Spain and Europe     

Maria C. Porcal-Gonzalo 《Journal of Map & Geography Libraries》2015,11(3):289-329

In recent years, there has been a growing recognition of the fact that the proper management of information has to include concern for its preservation and future re-use. This ambition is particularly significant for geospatial data. The primary aim of this article is to define the European and Spanish frameworks for the preservation and reutilization of geographical information, with the ultimate goal of proposing an articulated, lifecycle-based data management model. With this, the intent is to shed some light on a complex, difficult and ever-evolving subject.

The article is divided into two main parts. The first part begins with a conceptual justification for geospatial data management and continues by synthesizing the current normative and technological framework for the preservation and reutilization of geographical information. Within this context, the implementation of Spatial Data Infrastructures (SDI) in Spain is evaluated. The second part begins with a case study from Spain that aims to identify different agents and flows that influence the lifecycle of geographical data, as well as the strengths and weaknesses found in each stage of the process under examination. Finally, the foregoing ideas are used in order to propose a SDI-related system for the management of geographical information.  相似文献   

新“长期股权投资准则”相关问题研究     

张兴福 《安徽广播电视大学学报》2015,(1):35-39

2014年3月财政部颁布了新修订的《长期股权投资准则第2号———长期股股权投资》,本文在对新准则与原准则及相关解释深入比较的基础上,通过案例分析,阐明了在执行新的长期股权投资准则时有关的会计核算,并提出了对该准则进一步完善的思考和建议。  相似文献   

保存与传承:陈云与改革开放以来评弹艺术改革     

金坡 《江西师范大学学报(哲学社会科学版)》2015,(2):86-92

"文革"结束以后,陈云以极大的热情推动评弹艺术的改革,为保存和发展这门艺术做出了重要的贡献。对评弹艺术的研究与指导体现了陈云对社会主义文艺事业高度负责的精神,其充满辩证的文艺改革思想要求既要继承评弹的传统又要不断创新。这符合评弹的发展规律,也符合所有艺术的发展规律。陈云的文艺思想是马克思主义文艺思想的重要组成部分,对评弹乃至整个社会主义文艺工作都将产生深远影响。  相似文献   

数字资源长期保存开源软件比较研究     

/马宁宁周晨  冯红娟 《新世纪图书馆》2014,(8):37-42

摘要论文介绍了8种数字资源长期保存开源软件：Invemo、DSpace、Epfints、Fedora、Dmpal、i-Tor、MyCoRe和OPUS,阐述了它们的产生和发展过程,并从软件概况、技术规范、知识库及系统管理、系统性能及系统维护5个方面进行了比较分析,概括了这些软件的共同点和不同点,希望能够为各机构选择长期保存软件提供参考,并为国内从事数字图书馆系统设计和开发的同行提供参考。  相似文献   

基于生命周期的网络信息资源长期保存策略研究     

李曙光 《情报探索》2014,(11):20-23

阐述了网络信息资源的概念和特点,诠释了网络信息资源生命周期的内涵,提出了我国网络信息长期保存的策略,如建立全国统一的网络信息资源管理和协调机构、网络信息资源标准、网络信息资源仓储中心、网络信息资源长期保存机制。  相似文献   

4G时代通信行业节能减排长效机制探讨     

丁茂震  乐利锋  赵伟 《中国科技纵横》2014,(16):1-2

通过对中国三大运营商能耗数据的研究,引发电信业节能减排重要性的思考,总结共建共享机制、合同能源管理机制、绿色采购机制、押金返回机制和节能量交易机制的行业优势,指导4G时代节能技改工作。  相似文献   

应用型本科院校学风建设长效机制构建策略研究   总被引：1，自引：0，他引：1  

张蓉 《科教文汇》2014,(6):3-5

应用型本科教育作为一种新时期的高等教育类型,在我国高等教育体系中占有不可替代的特殊地位和作用。良好的学风是一所高校宝贵的无形资产。加强学风建设是培养和造就高素质人才的关键性要素,是提高教育教学质量和人才培养质量的重要保证。本文就应用型本科院校学风建设长效机制的必要性、所存在的问题以及构建策略进行阐述。  相似文献