高校实验室安全与环保教育方式和内容的思考   总被引：8，自引：3，他引：5  

金海萍  阮俊  冯建跃 《实验技术与管理》2011,28(3)

分析了高校实验室安全事故发生的因为、实验室安全与环保教育的主要对象、高校开展实验室安全与环保教育的重要性与紧迫性,在此基础上探讨了高校实验室安全与环保教育常规化、日常化、持久化的方式与内容,促进实验室与平安校园的建设.  相似文献   

Bilingualism Narrows Socioeconomic Disparities in Executive Functions and Self-Regulatory Behaviors During Early Childhood: Evidence From the Early Childhood Longitudinal Study     

Andree Hartanto  Wei X. Toh  Hwajin Yang 《Child development》2019,90(4):1215-1235

Socioeconomic status (SES) and bilingualism have been shown to influence executive functioning during early childhood. Less is known, however, about how the two factors interact within an individual. By analyzing a nationally representative sample of approximately 18,200 children who were tracked from ages 5 to 7 across four waves, both higher SES and bilingualism were found to account for greater performance on the inhibition and shifting aspects of executive functions (EF) and self-regulatory behaviors in classroom. However, only SES reliably predicted verbal working memory. Furthermore, bilingualism moderated the effects of SES by ameliorating the detrimental consequences of low-SES on EF and self-regulatory behaviors. These findings underscore bilingualism's power to enrich executive functioning and self-regulatory behaviors, especially among underprivileged children.  相似文献   

地方高等师范院校通用技术师资培养教学设计与实践     

贾天理  阮期平  游章强 《中国教育技术装备》2011,(27):7-10

探索提高地方高师院校师范学生技术素养的人才培养模式,在校本教学改革实践的基础上,提出为普通高中培养合格通用技术课程师资的教学设计方案。  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   

Local and teleconnected temperature effects of afforestation and vegetation greening in China     

Yue Li  Shilong Piao  Anping Chen  Philippe Ciais  Laurent Z X Li 《国家科学评论(英文版)》2020,7(5):897

Afforestation in China provides carbon sequestration and prevents soil erosion, but its remote impacts on climate in other regions via the coupling of forest energy fluxes with atmospheric circulation are largely unknown. Here, we prescribe inventory-based forest cover change and satellite-observed leaf area index from 1982 to 2011 in a coupled land-atmosphere model to simulate their biophysical climate effects. Both local and global surface air temperatures show a seasonal contrast in response to past vegetation cover expansion over China: a phenomenon we primarily attribute to a variation of seasonality of vegetation greening. A large cooling in spring results in concurrent decreases in geopotential height over China and zonal wind over Mongolia, causing a dipole structure in the upper troposphere over the Arctic. This accounts for ∼58% of simulated spring warming over the Russian Arctic and ∼61% of simulated spring cooling over the Canadian Artic. Our results imply that spring vegetation dynamics in China may affect climate in northern high latitudes.  相似文献   

Understanding divergent domestication traits from the whole-genome sequencing of swamp- and river-buffalo populations     

Xier Luo  Yu Zhou  Bing Zhang  Yi Zhang  Xiaobo Wang  Tong Feng  Zhipeng Li  Kuiqing Cui  Zhiqiang Wang  Chan Luo  Hui Li  Yanfei Deng  Fenghua Lu  Jianlin Han  Yongwang Miao  Huaming Mao  Xiaoyan Yi  Cheng Ai  Shigang Wu  Alun Li  Zhichao Wu  Zijun Zhuo  Do Da Giang  Bikash Mitra  Mohammad Farhad Vahidi  Shahid Mansoor  Sahar Ahmed Al-Bayatti  Eka Meutia Sari  Neena Amatya Gorkhali  Sigit Prastowo  Laiba Shafique  Guoyou Ye  Qian Qian  Baoshan Chen  Deshun Shi  Jue Ruan  Qingyou Liu 《国家科学评论(英文版)》2020,7(3):686

Domesticated buffaloes have been integral to rice-paddy agro-ecosystems for millennia, yet relatively little is known about the buffalo genomics. Here, we sequenced and assembled reference genomes for both swamp and river buffaloes and we re-sequenced 230 individuals (132 swamp buffaloes and 98 river buffaloes) sampled from across Asia and Europe. Beyond the many actionable insights that our study revealed about the domestication, basic physiology and breeding of buffalo, we made the striking discovery that the divergent domestication traits between swamp and river buffaloes can be explained with recent selections of genes on social behavior, digestion metabolism, strengths and milk production.  相似文献   

应时而动,走出困境--对印前制版行业发展的思索     

阮洪银 《出版与印刷》2005,(3):46-47

印刷业的印前制版行业在过去的十几年中经历过数次大起大落,曾有着以高科技技术独领风骚、辉煌一时的时光,但时至今日,昔日的光彩已经荡然无存,整个领域在"成也萧何、败也萧何"的信息化、数字化浪潮下惨淡经营,在一无客户、二无市场、三无优势的境况中苦苦求生,举步维艰.究竟是何种魔咒导致了这戏剧化的一幕?是否我们的印前制版行业真的要在印刷业蓬勃发展的大环境下惨淡收场?我们昔日的光环为何现在无影无踪?印前制版行业今天该如何发展?  相似文献   

解读政府提供图书馆公共服务的过程与内涵——兼谈与图书馆公共管理的区别   总被引：3，自引：0，他引：3  

阮胜利  毛旭 《图书馆杂志》2007,26(4):10-13

以文化体制改革为背景,指出图书馆事业存在的四方面问题,通过对图书馆服务产品的意识形态、准公共物品两个属性及正外部性、垄断性、信息不对称性、地域性等四大特征的分析,解读政府提供图书馆公共服务的过程与内涵,区分公共服务与公共管理两者间不同的运作方式,有利于图书馆事业的科学改革与图书馆服务机制的转换。  相似文献   

String vibration dampers do not reduce racket frame vibration transfer to the forearm     

Li FX  Fewtrell D  Jenkins M 《Journal of sports sciences》2004,22(11-12):1041-1052

In this study, we examined the effect of string vibration damping devices on reducing racket frame vibration transfer to the forearm. Twenty participants volunteered to hold a tennis racket stationary in a forehand and backhand stroking position while tennis balls were fired at 20 m x s(-1) towards two impact locations, the node of vibration and the dead spot. A three-way analysis of variance with repeated measures on damping condition, impact location and stroke condition was performed on the data. The resonant frequency of the hand-held racket was found to be approximately 120 Hz. No significant differences in amplitude of vibration at the resonant frequency were found for the wrist or the elbow when damped and non-damped impacts were compared. Impacts at the dead spot produced greater amplitudes of vibration (P < 0.01) but no interaction between impact location and string dampers was evident. The string dampers had no effect on the grip force used or the muscle electrical activity in the forearm after impact. In conclusion, we found that string dampers do not reduce the amount of racket frame vibration received at the forearm. We suggest that string dampers remain a popular accessory among tennis players because of their acoustic effects and psychological support rather than any mechanical advantage.  相似文献   

数字图书馆知识产权问题研究   总被引：49，自引：0，他引：49  

阮延生 《中国图书馆学报》2002,28(1)

数字图书馆建设与服务过程中 ,会涉及到复制权、传播权和数据库保护等知识产权方面的问题。应利用国内外版权法赋予图书馆“合理使用”的权利 ,最大限度满足读者信息需求。参考文献 9。  相似文献