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   

CUE SYSTEM UTILIZATIONS AMONG OLDER READERS     

R. J. De Santi 《Educational gerontology》2013,39(3):271-277

The effects of writing style upon mature older readers’ reading comprehension are considered. Two narrative historical selections, the first emotive and abstract and the second nonemotive and concrete, were employed. Miscue analysis was used to evaluate the efficiency with which each reader used reading strategies across the five systems that cue meaningful comprehension. Miscues were analyzed at the word, clause, sentence, and intersentence levels. In addition, interview schedules were employed to identify readers’ perceptions of preferred reading strategies and to permit a comparison with actual performance. The findings indicate that mature older readers are consistent in cue system utilization. A preference for the word cue system influenced both the use of cues from other systems and comprehension. Use of the word‐level cue system is inversely related to the use of the other available cue systems. Preference for cues within words also appears to be inversely related to comprehending effectiveness. The subjects’ perceptions of the reading process and their actual reading performance appeared to determine patterns of cue system use more clearly than did the differences in materials. As a result, those developing materials intended for use in programs with older persons should not only be concerned with the content and quality of those materials but also the skills and perceptions of those who will use the materials.  相似文献   

Beyond the white norm: the use of qualitative methods in the study of black youths’ schooling in England     

M#aaairt#aain Mac An Ghaill 《International journal of qualitative studies in education》2013,26(3):175-189

There is at present in England great confusion concerning the schooling of black youths. Much conventional “race‐relations” research is underpinned by models of social pathology that perceives the youths as a “problem.” While carrying out a study of black students, of Afro‐Caribbean and Asian parentage, qualitative research pointed to the need to re‐conceptualise their experience of schooling within a framework that moves beyond liberal assumptions of a de‐racialised, de‐gendered and de‐politicised school system. Placing students at the centre of the research enables us to see how school for black youths is part of a wider alienating response to them that results in their experience of a “different reality” from the white population. In response to this, the students have creatively developed a number of survival strategies. This article explores the implications of the relative autonomy of methodology from wider theoretical and substantive concerns. In this largely autobiographical account the dialectical nature of ethnography is illustrated, with the theoretical#shconceptual analysis grounded in the data gathering process.  相似文献   

基于层次分析法的城市专利战略SWOT分析——以泉州为例     

安结  张文德 《情报探索》2010,(11)

以泉州市专利战略研究为例,利用AHP分析法在确定因子权重方面的优越性,结合SWOT分析法的定量化研究,为泉州市专利战略制定提供依据.  相似文献   

An orthopedagogical method for children with a depression     

Frank De Fever 《欧洲特需教育杂志》2013,28(3):262-274

ABSTRACT

An orthopedagogical method for teaching children with a depression is presented here. Relatively unknown in the English‐speaking world, orthopedagogy is a pedagogical discipline that is aimed at an entire action field. It does not target the child with handicap, but the entire problematic educational situation (PES). Orthopedagogy is the scientific study of assistance given to those concerned with a PES ‐ namely, the child, parents, brothers and sisters, grandparents, and so on. To break through a PES or to get rid of it, the orthopedagogician has to listen to the orthopedagogical request for help of the child and give an appropriate answer to it. On the basis of a theoretical model of Paul Gilbert, an orthopedagogic request for helping children with a depression was formulated. Gilbert's model offers a perspective derived from evolution theory and argues for the adoption of a bio‐psychological approach. Children with a depression request a warm and loving climate, an attractive and simple education situation and close involvement on the part of the educator. To answer that request, we set orthopedagogical action on two tracks. On track 1 (dialogical action) we try to break through the PES by asking the educator to over‐accentuate the pedagogical climate, the education situation and his/her own presentation. On track 2 (technical action) we designed an approach aimed at children aged between 6 and 12 years with a depression.  相似文献   

起伏地形下朝鲜半岛天文辐射的时空分布     

张世范  张岸  齐清文  刘高焕 《资源科学》2010,32(6):1097-1102

本文应用数字高程模型(DEM)数据和地理信息系统(GIS),建立了起伏地形下天文辐射分布式计算模型,计算了朝鲜半岛起伏地形下全年各月的100m×100m分辨率天文辐射精细空间分布结果,并详细分析了朝鲜半岛天文辐射的空间分布特征。计算结果表明:①在朝鲜半岛天文辐射同时受到南北方向纬度带的影响和山地条件的影响,其中山地影响大于纬度带影响;②朝鲜半岛天文辐射具有明显的季节特征;③朝鲜半岛地形对天文辐射的影响存在季节差异,夏季6月最小,冬季12月最大。  相似文献   

RIM: A Random Item Mixture Model to Detect Differential Item Functioning     

Sofie Frederickx  Francis Tuerlinckx  Paul De Boeck  David Magis 《Journal of Educational Measurement》2010,47(4):432-457

In this paper we present a new methodology for detecting differential item functioning (DIF). We introduce a DIF model, called the random item mixture (RIM), that is based on a Rasch model with random item difficulties (besides the common random person abilities). In addition, a mixture model is assumed for the item difficulties such that the items may belong to one of two classes: a DIF or a non-DIF class. The crucial difference between the DIF class and the non-DIF class is that the item difficulties in the DIF class may differ according to the observed person groups while they are equal across the person groups for the items from the non-DIF class. Statistical inference for the RIM is carried out in a Bayesian framework. The performance of the RIM is evaluated using a simulation study in which it is compared with traditional procedures, like the likelihood ratio test, the Mantel-Haenszel procedure and the standardized p -DIF procedure. In this comparison, the RIM performs better than the other methods. Finally, the usefulness of the model is also demonstrated on a real life data set.  相似文献   

山西省青少年武术套路运动员无氧能力特征的研究     

牛会康  安静 《搏击·武术科学》2010,7(5):45-47

文章通过对山西省武术管理中心16名青少年武术套路运动员进行了无氧功测试、血乳酸测试，测试所获数据采用秩和检验进行组间均数比较，并对wingate结果和血乳酸结果进行相关性检验，得出结论：（1）青少年武术套路运动员的无氧能力并不是影响成绩的主要因素。（2）青少年武术套路运动员的无氧能力相比体能占主导的无氧运动而言较差。（3）wingate测试的各项指标采用其体重相对值更能反映运动员之间无氧能力的差别。（4）运动后7分钟的血乳酸水平可以反应青少年武术套路运动员的无氧能力水平。  相似文献   

对我国高校高水平运动队的现状分析及其发展对策的研究   总被引：6，自引：2，他引：6  

安儒亮 《西安体育学院学报》1992,(4)

本文对36所试办高水平运动队的高校进行了全面调查。结果表明:目前我国高校高水平运动队普遍存在着指导思想混乱;生源经费短缺;运动员年龄偏大;场馆破损陈旧;项目布局不合理;重训练轻文化;教练素质较差等问题。针对上述现状及成因,作者提出了若干发展对策和改革建议,旨在使高校办高水平运动队工作出现新的局面。  相似文献   

我国中文图书在版编目存在问题探析     

安新华 《河南图书馆学刊》2007,27(3):77-78

简要论述了中文图书在版编目在分类标引、著录等方面存在的问题,并提出了提高图书在版编目质量应采取的措施.  相似文献