Large-scale multiferroic complex oxide epitaxy with magnetically switched polarization enabled by solution processing     

Cong Liu  Feng An  Paria S M Gharavi  Qinwen Lu  Junkun Zha  Chao Chen  Liming Wang  Xiaozhi Zhan  Zedong Xu  Yuan Zhang  Ke Qu  Junxiang Yao  Yun Ou  Zhiming Zhao  Xiangli Zhong  Dongwen Zhang  Nagarajan Valanoor  Lang Chen  Tao Zhu  Deyang Chen  Xiaofang Zhai  Peng Gao  Tingting Jia  Shuhong Xie  Gaokuo Zhong  Jiangyu Li 《国家科学评论(英文版)》2020,7(1):84

Complex oxides with tunable structures have many fascinating properties, though high-quality complex oxide epitaxy with precisely controlled composition is still out of reach. Here we have successfully developed solution-based single-crystalline epitaxy for multiferroic (1-x)BiTi_(1-y)/2Fe_yMg_(1-y)/2O₃–(x)CaTiO₃ (BTFM–CTO) solid solution in large area, confirming its ferroelectricity at the atomic scale with strong spontaneous polarization. Careful compositional tuning leads to a bulk magnetization of 0.07 ± 0.035 μ_B/Fe at room temperature, enabling magnetically induced polarization switching exhibiting a large magnetoelectric coefficient of 2.7–3.0 × 10⁻⁷ s/m. This work demonstrates the great potential of solution processing in large-scale complex oxide epitaxy and establishes novel room-temperature magnetoelectric coupling in epitaxial BTFM–CTO film, making it possible to explore a much wider space of composition, phase, and structure that can be easily scaled up for industrial applications.  相似文献   

Research ethics: a safeguard for advanced technologies     

Hepeng Jia 《国家科学评论(英文版)》2020,7(11):1787

With the fast development of cutting-edge technologies and their greater integration into human life, more ethical challenges emerge. The problem became more salient when the world''s first genetically edited babies were born in China in violation of existing ethical rules. Although the responsible researcher He Jiankui was sentenced for imprisonment for three years last December, it is still necessary to examine the current status of research ethics and the challenges in China. Has China set up a sophisticated research ethics system? For research ethics and their implementation in China, are there unique national characteristics? Can the dominant ethics principles primarily developed from life science research be equally adopted in the emerging artificial intelligence research and development? At an online forum organized by National Science Review (NSR) and through subsequent correspondences among forum participants, NSR Executive Editor-in-Chief Mu-ming Poo and guest moderator Hepeng Jia asked three scientists and three bioethicists or philosophers of science and technology in the field to examine the dynamic development of research ethics in China. Weiwen DuanPhilosopher of Science and Technology at Chinese Academy of Social Sciences, Beijing, China Junjiu HuangLife scientist focused on genetics at Sun Yat-sen University, Guangzhou, China Renzong QiuBioethicist at Chinese Academy of Social Sciences, Beijing, China Qiang SunLife scientist and the principal investigator (PI) of clone monkey program at Shanghai Institute of Neuroscience, Chinese Academy of Sciences, Shanghai, China Yi ZengArtificial intelligence scientist at Institute of Automation, Chinese Academy of Sciences, Beijing, China Xiaomei ZhaiBioethicist at Chinese Academy of Medical Sciences/Peking Union Medical College, Beijing, China Mu-ming Poo (Chair)Neurobiologist at Center for Excellence in Brain Science and Intelligence Technology, Chinese Academy of Sciences, Shanghai, China Hepeng Jia (Co-chair)Professor of Science Communication at Soochow University, Suzhou, China  相似文献   

An overview of the use of plastic-film mulching in China to increase crop yield and water-use efficiency     

Dongbao Sun  Haigang Li  Enli Wang  Wenqing He  Weiping Hao  Changrong Yan  Yuzhong Li  Xurong Mei  Yanqing Zhang  Zhanxiang Sun  Zhikuan Jia  Huaiping Zhou  Tinglu Fan  Xucheng Zhang  Qin Liu  Fengju Wang  Chaochun Zhang  Jianbo Shen  Qingsuo Wang  Fusuo Zhang 《国家科学评论(英文版)》2020,7(10):1523

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从同构的角度解读《多丽·咏白菊》许渊冲的译本     

贾婷婷 《长治学院学报》2013,(3)

同构作为一种衔接手段通常出现在各种文体中，辅助实现上下文语义的衔接与连贯。本文将通过同构关系来解读《多丽·咏白菊》这首词许渊冲老先生的译本。  相似文献   

草木诗人许雪萍诗歌生命意识探微     

刘佳 《南宁师范高等专科学校学报》2013,(4):104-106

许雪萍是当下广西诗坛实力派青年女诗人。作为很有个性的＂草木诗人＂,对大自然的诗意捕捉——在大自然的诗意抒情中,建构诗人的生命意识、追寻和探索生命的价值、探寻生命的家园,这是许雪萍诗歌的主要内容特点。  相似文献   

网络时代的百科全书--维基百科   总被引：11，自引：1，他引：11  

于嘉 《图书馆论坛》2005,25(4):247-248,F0003

维基百科是在互联网基础上产生的一种新型百科全书。与传统百科全书不同，它采用全球志愿者协作的方式完成，目前已经取得了令人瞩目的成就。文章介绍了这种新型的百科全书，并对其相关功能进行了评介。  相似文献   

基于本体论的个性化网络信息检索     

李学庆  贾玉文 《图书馆学研究》2007,(1):67-70

传统的网络信息检索存在很多缺陷,导致检索效率低下。本文提出了一种基于本体论的个性化网络信息检索的模型。该模型的实现可以在一定程度上缓解Internet网上信息过载的问题,提供用户个性化信息检索服务,提高网络信息检索的准确率。  相似文献   

汉语框架网络知识本体构建研究   总被引：2，自引：0，他引：2       下载免费PDF全文

贾君枝  陈幼华 《中国图书馆学报》2007,33(2)

汉语框架网络知识本体是以框架语义学为理论基础,有丰富的语料库支撑,揭示了概念的本体关系。其获取,是在构建语料库的基础上,利用叙词表、分类表和其他知识分类体系等现有的知识本体,识别领域内外相关的概念并抽取相应属性,建立概念之间的关系,并利用所识别的概念和关系创建新的本体,融合已有的本体和新建本体。图2。参考文献4。  相似文献   

中文政府网站评价指标体系的构建与应用     

朱庆华  韩晓静  杜佳  戚爱华 《图书情报工作》2007,51(11):67-70

结合政府网站的特点,采用网上特尔菲法进行专家调查以确定政府网站评价的各项指标,并利用基于指数标度的层次分析法确定各项指标的权重,从而构建科学、合理的政府网站评价指标体系。在此基础上,选择若干中文政府网站作为评价对象：进行实证分析。结合本次评价研究的结果和政府网站的发展趋势,为政府网站的建设提供若干建议。  相似文献   

九运会太极拳决赛指定动作失误率分析     

朱家勇  潘冬 《体育学刊》2002,9(6):125-127

对第九届全运会武术套路决赛(顺德赛区)运动员太极拳指定动作的完成质量进行研究，统计其失误率及扣分要项，并对造成失误的原因及其影响因素进行分析。针对问题提出相应对策，为竞技武术套路训练和竞技水平的提高提供参考。  相似文献