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   

Matlab在《运筹学》教学中的应用     

阮周生  何杰 《科技广场》2006,(7):92-93

本文分析了高校《运筹学》教学方法中的不足,指出了在《运筹学》教学中加入Matlab语言,并且通过实例验证了利用Matlab教学比传统的教学法更有优势,在实际教学中有些具体的指导意义。  相似文献   

Resting MAPK expression in chronically trained endurance runners     

Justin X. Nicoll  Andrew J. Galpin  Donald B. Thomason  Christopher A. Moore 《European Journal of Sport Science》2017,17(9):1194-1202

Purpose: There is a paucity of research investigating the expression of mitogen-activated protein kinases (MAPK) in chronically trained (CT) athletes. Thus, it is unclear how MAPK may contribute to performance and muscle adaptation in CT subjects. The purpose of this study was to determine MAPK total protein, and phosphorylated expression of extracellular signal-regulated kinases 1 and 2 (ERK1/2), c-Jun N-terminal kinase (JNK), and p38-MAPK (p38) between untrained, and chronically trained runners. Methods: Tissue samples were analysed from sedentary (SED; n?=?5) controls and chronically trained runners (CT; n?=?5). Resting muscle biopsy samples were analysed for total-MAPK – and ratio of phosphorylated/total (p-MAPK) – ERK1/2, JNK, and p38-MAPK via western blotting. Mann–Whitney U tests and effect sizes were utilized to determine differences in total MAPK protein content and phosphorylation status between SED and CT subjects. Results: There was no difference in total-MAPK expression between SED and CT (p?>?.05). p-p38-MAPK tended to be greater for CT compared to SED (p?=?.07). There were moderate effect sizes of decreased pERK/total-ERK (d?=??0.69) and increased pJNK/total-JNK (d?=?0.54) in CT compared to SED. There was a positive correlation between p-p38-MAPK/total-MAPK and the percentage of type I fibres (r?=?0.73, p?=?.016). Conclusion: Contrary to previous studies, chronic endurance training does not greatly influence total MAPK protein expression in chronically trained runners. However, resting phosphorylation of p38-MAPK may contribute to enhanced oxidative metabolism at chronically trained levels. These alterations are likely involved in the different physiological adaptations that occur following long-term training or at highly competitive levels.  相似文献   

Meet in Beijing in This Romantic Spring     

X  in Yuan 《中外文化交流(英文版)》2013,(7):10-15

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The distance-time relationship over a century of running Olympic performances: A limit on the critical speed concept     

Dekerle J  Nesi X  Carter H 《Journal of sports sciences》2006,24(11):1213-1221

We analyse the evolution of the slope (critical speed) and the y-intercept (anaerobic distance capacity) of the linear distance-time relationship over a century of Olympic running performances. The distance-time relationship of each Olympic Games (1920-2004) was plotted using the performances in the 800-, 1500- and 5000-m track events. Values for critical speed and anaerobic distance capacity were determined by linear modelling. Mean performances for the 800, 1500 and 5000 m were 104.9 +/- 1.5 s (1.4%), 217.2 +/- 2.8 s (1.3%) and 808.9 +/- 18.4 s (2.3%), respectively. Critical speed improved during the first three-quarters of the twentieth century to reach a plateau in 1984. This is in accordance with the literature (Peronnet & Thibault, 1989) and suggests that "human aerobic endurance" has improved within the century (+13.4%) and tends to stabilize. Anaerobic distance capacity was highly variable over the century (coefficient of variation = 9.4%) and did not show a linear improvement over the years as has previously been suggested (Peronnet & Thibault, 1989). This could be due to an artefact in the application of the two-parameter model to only three Olympic performances. A limitation to the use of this linear mathematical model to fit physiological data may have been demonstrated.  相似文献