2020春季开学第一课语文教学案例     

周赢赢  侯家乐 《科教文汇》2020,(12):I0008-I0008

随着疫情形势的逐渐好转,各行各业相继复工复产,各中小学校也将陆续开学。为了抚慰疫情给孩子们的心灵带来的影响,时值春季,我们选择了毛泽东的《七绝·咏蛙》作为开学后语文教学的第一课。  相似文献   

Anisotropic fluoride nanocrystals modulated by facet-specific passivation and their disordered surfaces     

Ziyu Yang  Huihui Zhang  Junjie Xu  Renzhi Ma  Takayoshi Sasaki  Yu-Jia Zeng  Shuangchen Ruan  Yanglong Hou 《国家科学评论(英文版)》2020,7(5):841

Rutile-type fluorides have been proven to be active components in the context of emerging antiferr-omagnetic devices. However, controlled synthesis of low-dimensional, in particular two-dimensional (2D), fluorides in a predictable and deterministic manner remains unrealized because of a lack of efficient anisotropic control, which impedes their further development in reduced dimensions. We report here that altered passivation of {110} growing facets can direct the synthesis of rutile-type fluoride nanocrystals into well-defined zero-dimensional (0D) particulates, one-dimensional (1D) rods and 2D sheets in a colloidal approach. The obtained nanocrystals show positive exchange bias and enhanced magnetic transition temperature from the coexistence of long-range antiferromagnetic order and disordered surface spins, making them strong alternatives for flexible magnetic devices and sensors.  相似文献   

Liquid gating membrane     

Xu Hou 《国家科学评论(英文版)》2020,7(1):9

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可持续发展视角下全民健身服务体系的内涵解析     

梁法泽  聂瑞莲  侯玉灵 《体育科技文献通报》2020,(1):10-12

本文以可持续发展为视角,阐述了可持续发展视角下全民健身服务体系内涵。利用文献资料法、实地考察法及专家访谈法,对可持续发展视角下全民健身服务体系发展现状进行了简单分析。进一步探究了可持续发展视角下全民健身服务体系建设路径,以期为可持续发展视角下全民健身服务体系建设提供有效的借鉴。  相似文献   

大学生体质健康测试中运动损伤的调查研究     

朱丽丽  侯毓岭  蒋兰新 《体育科技文献通报》2020,(4):62-63

为了更好地完成《国家学生体质健康标准》的测试工作,本文采用文献资料、逻辑分析、实地考察等方法,对大学生体质健康测试过程中常发生的运动损伤进行了分析,并提出相应的预防措施,为体质健康测试的顺利进行、学生的健康发展、教育主管部门的决策提供了理论依据。  相似文献   

Molecular design revitalizes the low-cost PTV-polymer for highly efficient organic solar cells     

Junzhen Ren  Pengqing Bi  Jianqi Zhang  Jiao Liu  Jingwen Wang  Ye Xu  Zhixiang Wei  Shaoqing Zhang  Jianhui Hou 《国家科学评论(英文版)》2021,8(8)

Developing photovoltaic materials with simple chemical structures and easy synthesis still remains a major challenge in the industrialization process of organic solar cells (OSCs). Herein, an ester substituted poly(thiophene vinylene) derivative, PTVT-T, was designed and synthesized in very few steps by adopting commercially available raw materials. The ester groups on the thiophene units enable PTVT-T to have a planar and stable conformation. Moreover, PTVT-T presents a wide absorption band and strong aggregation effect in solution, which are the key characteristics needed to realize high performance in non-fullerene-acceptor (NFA)-based OSCs. We then prepared OSCs by blending PTVT-T with three representative fullerene- and NF-based acceptors, PC₇₁BM, IT-4F and BTP-eC9. It was found that PTVT-T can work well with all the acceptors, showing great potential to match new emerging NFAs. Particularly, a remarkable power conversion efficiency of 16.20% is achieved in a PTVT-T:BTP-eC9-based device, which is the highest value among the counterparts based on PTV derivatives. This work demonstrates that PTVT-T shows great potential for the future commercialization of OSCs.  相似文献   

《历史与社会》教学实践中的问题和困惑     

蔡文华 《基础教育研究》2006,(4):43-44

2002年秋,伴随着新一轮课程改革的全面推行,《历史与社会》新教材在匆忙中诞生,又在匆忙中走进课堂。面对着崭新的教材,既无可供借鉴的经验,也缺乏可以参考的书籍,“摸着石头过河”是初执教时的心态。如今,通过3年多的教学实践,我们欣喜地看到,在教师的教学理念和课堂教学实践、学生的学业评价和学习方式的改变等方面取得了显著的成效。尤其是以自主、合作、探究为主的学习方式,真正体现了“以学生发展为本”的新理念,更有利于学生的主动发展和综合素质的全面提高。但是在新课程教学实施过程中也碰到许多问题,有过许多困惑。在这里提出来与…  相似文献   

绿色农业控制系统创新实践教学平台设计     

王猛  吴建强  李琰  崔振  侯博雅 《中国现代教育装备》2021,(1):26-29

以绿色农业应用为背景,融入现代科技设计创新实践教学平台.系统设计了清洁能源系统、能源储存系统、信息采集系统、智能温室控制系统、中央控制系统、人机交互以及云平台应用系统,实现能源自给自足、环境信息采集与存储、无线区域组网、系统信息显示与预警、智能控制等功能.系统内各功能部分,采用独立的模块化设计,易于组装移植,综合性、开...  相似文献   

Injectable hybrid inorganic nanoscaffold as rapid stem cell assembly template for cartilage repair     

Shenqiang Wang  Letao Yang  Bolei Cai  Fuwei Liu  Yannan Hou  Hua Zheng  Fang Cheng  Hepeng Zhang  Le Wang  Xiaoyi Wang  Qianxin Lv  Liang Kong  Ki-Bum Lee  Qiuyu Zhang 《国家科学评论(英文版)》2022,9(4)

Cartilage injuries are often devastating and most cannot be cured because of the intrinsically low regenerative capacity of cartilage tissues. Although stem-cell therapy has shown enormous potential for cartilage repair, the therapeutic outcome has been restricted by low survival rates and poor chondrocyte differentiation in vivo. Here, we report an injectable hybrid inorganic (IHI) nanoscaffold that facilitates fast assembly, enhances survival and regulates chondrogenic differentiation of stem cells. IHI nanoscaffolds that strongly bind to extracellular matrix (ECM) proteins assemble stem cells through synergistic 3D cell–cell and cell–matrix interactions, creating a favorable physical microenvironment for stem-cell survival and differentiation in vitro and in vivo. Additionally, chondrogenic factors can be loaded into nanoscaffolds with a high capacity, which allows deep, homogenous drug delivery into assembled 3D stem-cell-derived tissues for effective control over the soluble microenvironment of stem cells. The developed IHI nanoscaffolds that assemble with stem cells are injectable. They also scavenge reactive oxygen species and timely biodegrade for proper integration into injured cartilage tissues. Implantation of stem-cell-assembled IHI nanoscaffolds into injured cartilage results in accelerated tissue regeneration and functional recovery. By establishing our IHI nanoscaffold-templated 3D stem-cell assembly method, we provide a promising approach to better overcoming the inhibitory microenvironment associated with cartilage injuries and to advance current stem-cell-based tissue engineering.  相似文献   

美国情报搜集中个人数据隐私权状况及对我国的启示 ——以FISA第702条为研究样本     

穆兴天  马文华 《情报杂志》2021,40(4):126-131

[目的/意义]大数据时代,美国情报机构监视恐怖嫌疑分子数据作为维护美国国家安全的重要方面,效果显著。然而,实践中出现"国家安全"和"个人数据安全""个人隐私权"相冲突的问题,对之研究具有重要的镜鉴价值。[方法/过程]以美国《涉外情报监控法》第702条为研究样本,实证分析了个人隐私被侵犯的原因,如即情报搜集工作监督不严、问责不力等。规范分析了平衡"国家安全"和"个人数据安全""个人隐私权"之间的法律对策。[结果/结论]研究认为,设立情报监督机构,规制数据使用目的和范围,加大问责力度是平衡国家安全和公民个人数据隐私权的积极面向。  相似文献