Results 41 to 50 of about 688,354 (170)
Haiyang yu huzhao为探究大鳞副泥鳅台湾种群(Paramisgurnus dabryanus ssp. Taiwan, 以下简称台鳅)和选育系“赣红1号”(“Ganhong No.1”, 以下简称红鳅)体色发育形成过程中色素相关基因和通路的动态变化对体色发育及调控的影响，研究红鳅体色突变的形成机制，实验通过显微观察和荧光定量PCR等方法，探究了台鳅和红鳅成鱼5种鱼鳍色素细胞类型、早期体色发育的过程，以及不同发育时期14个体色相关基因(tyr、mitfa、foxd3、oca2、dct、tbx2a、kita、slc45a2 ...
胡 艳 +9 more
doaj +1 more source
Co‐Teaching in a Virtual Intensive Study Language Programme: Insights From Team Ethnography
International Journal of Applied Linguistics, EarlyView.ABSTRACT As virtual study abroad becomes an increasingly important form of international education, little is known about how transnational teaching is organised and sustained across institutions. Using activity theory as an analytical framework and team ethnography as methodology, this study examines a virtual intensive study (VIS) programme delivered
Zhu Hua +7 more
wiley +1 more source
, 2007 本书是《中国可持续发展总纲》第5卷。本书从总论和区域分论两个层次上全面阐述了我国土地资源利用历史、现状和存在的问题,从土地资源的高效持续利用及土地资源与其他资源相配合共同支撑经济、社会可持续发展的角度,探讨了土地资源利用与可持续发展的关系,提出了土地资源可持续利用若干战略对策。全书分上、下两篇。上篇是中国土地资源与可持续发展总论,包括中国土地资源与可持续发展概论,耕地、园地、林地、草地、湿地(水域）、交通用地、居民点及工矿用地、未利用土地等土地资源8个一级类的利用与持续发展分论等13章。
成升魁
core
Shuitu Baochi Xuebao, 2002 土壤是农业生存之本,土壤质量是联系土壤管理与可持续农业的桥梁与纽带。介绍了土壤质量的概念及其发展,在客观地分析我国土壤质量现状的基础上,提出土壤管理必须建立在土壤质量的基础上并兼顾土壤的生产性、稳定性、持续性、生存性及社会的可接受性,才能实现农业的可持续发展。
张海林
doaj +2 more sources
International Journal of Applied Linguistics, EarlyView.ABSTRACT Grounded in social cognitive theory, this study investigated how high‐evidence factors jointly contribute to Chinese‐as‐a‐foreign‐language (CFL) speaking self‐efficacy. Data from 236 CFL learners in Beijing revealed a multifaceted pattern of associations.
Peijian Paul Sun +3 more
wiley +1 more source
, 1997 本文试图从不同角度阐述可持续发展理论与生态学基本原则的内在联系。工业文明后期引发的生态危机唤醒了人们的环境意识，促使可持续发展思想逐步形成。可持续发展理论最早是由环境学家和生态学家提出来的。自然生态系统“整体、协调、循环、再生”的运行法则给人类以莫大的启迪，并成为可持续发展的理论基础。人与自然的关系是可持续发展的核心问题，经济系统与生态系统的协调 ...
李辛夫
core
Designing Integrated Policies for the Twin Transition: Challenges and Tradeoffs
Policy Studies Journal, EarlyView.ABSTRACT Democratic governance faces the intertwined imperatives of managing the transformative risks and opportunities of digitalization, particularly stemming from artificial intelligence (AI), while achieving environmental sustainability within planetary boundaries.
Martino Maggetti
wiley +1 more source
, 2003 环境与发展的关系问题是可持续发展的核心问题。竺可桢以中国的农业社会背景为思考的始点、从地理学的视角、基于对环境的长时段考察,用毕其一生对中国的发展与环境问题作出了深刻的思考和探讨,得出应在发展中保护自然的论断。由此,本文认为 ...
孙承晟
core
World Food Policy, Volume 12, Issue 2, November 2026.ABSTRACT This study explores environmental justice issues in coastal food systems, focusing on conflicts between small‐scale fisheries and the energy sector due to differing goals in managing food and energy sources. It does so by examining the interdependence between institutions, policies, and different types of knowledge; key elements in building ...
Mateus Henrique Amaral +6 more
wiley +1 more source
, 2005 本书全面系统地阐述了生态旅游（eco-tourism）的理论，以可持续发展为主线研究了生态旅游、生态环境、旅游资源与生态系统之间的有关问题，探讨了中国特色生态旅游的开发、规划设计模式，全方位展示了风景区、山地、自然保护区和农业地区开发生态旅游的典型案例。;本书强调理论性与实用性相结合，体现了理论、方法与案例相结合的特色。注重对当前生态旅游规划设计方法的系统总结，从而建立中国特色生态旅游理论和实践体系，以实现我国旅游业的可持续发展。;本书是从事旅游科学研究、旅游规划设计、区域规划等科技人员的重要参考资料 ...
鄢和琳, 印开蒲
core