氢氘原子光谱实验最优参数的确定     

谢佳林  张萍  曲艳玲  刘佳宏 《实验室研究与探索》2011,30(10):44-45,62

为了获得了清晰的氢氘原子光谱谱线,首先确定了对光谱谱线有影响的负高压及狭缝宽度2个实验参量。先选定氢原子的一条谱线,在一定的负高压下,通过改变狭缝宽度来获取不同组光谱谱线,经分析得到理想的狭缝宽度范围。在该范围内选取几条狭缝宽度,分别通过改变负高压来得到理想的最优参数组。实验发现,对于不同的波长最优参数组参数不同,因此又用同样的方法对其他的谱线进行了探究,找到不同谱线的公共最优参数区间,最终获得了清晰的氢原子光谱谱线。  相似文献   

澳大利亚公民教育发展的三个维度     

李维喆  韩芳 《外国教育研究》2011,(9):81-85

从20世纪初起,澳大利亚公民教育经历了曲折的发展历程,其发展主要包含三个维度:社会科从产生到逐步完善、旧公民学逐步发展为新公民学、公民身份逐渐替代臣民身份。从某种程度上说,澳大利亚公民教育的发展就是一部独特的澳大利亚社会发展史。  相似文献   

上三角算子矩阵的谱扰动     

轩敏强  徐肖丽 《商丘职业技术学院学报》2011,10(2):7-8

本文利用算子谱的分块技巧,研究了上三角算子矩阵的谱扰动.给出了当算子A∈B(H),B∈B(K)给定时,σ(A)∪σ(B)\∩C∈B(K,H)σ(MC)的表示,这里σ(A)表示算子A的谱,MC=(AC/0B)  相似文献   

Teaching science skills and knowledge to students with developmental disabilities: A systematic review     

Magdalena M. Apanasionok  Richard P. Hastings  Corinna F. Grindle  Richard C. Watkins  Andreas Paris 《科学教学研究杂志》2019,56(7):847-880

A comprehensive review of the literature was conducted to identify current practice on teaching science to students with intellectual disability (ID) and/or Autism Spectrum Disorder (ASD) in relation to two review questions—students' science outcomes and students' and teachers' experiences of the interventions. Six databases related to education, psychology, and science were systematically searched. A detailed protocol can be viewed on PROSPERO (registration number: CRD42017057323). Thirty studies were identified that reported on science interventions and 20 on student/teacher experiences of the interventions. The majority of the studies targeted science vocabulary and concepts. Other targets included inquiry skills and comprehension skills. The majority of the interventions used components of systematic instruction (n = 23). Five studies focused on self-directed learning and two on comprehension-based instruction. Students and teachers reported positive experiences of the interventions. The findings suggest that components of systematic instruction in particular might be effective in teaching science content to students with ID and/or ASD. Further research is needed to explore the effectiveness of identified interventions on teaching more complex science skills and with students with severe disabilities. Some limitations related to the search strategy are highlighted.  相似文献   

‘I'm ready for a new chapter’: The voices of young people with autism spectrum disorder in transition to post-16 education and employment     

Carolina Gaona  Olympia Palikara  Susana Castro 《British Educational Research Journal》2019,45(2):340-355

This study explores the views and experiences of 12 young people with autism spectrum disorder (ASD) in transition to post-16 education and employment, in light of the changes introduced by the new special educational needs and disability (SEND) legislation in England. The extension of provision until the age of 25, and the introduction of person-centred education, health and care (EHC) plans, have given a significant place to the views of young people with SEND and their families. The views, wishes and aspirations of young people must be captured in the newly developed plans, reflecting the statutory requirement for local authorities to systematically record these in a biopsychosocial way, focusing on participation and well-being. Twelve semi-structured interviews were conducted with young people with ASD attending specialist settings or receiving specialist support under the new EHC plans. These were analysed inductively, through thematic analysis. The findings suggest that at the time of transition, young people with ASD want to become increasingly more independent, present ambivalent feelings about their future and acknowledge the relevance of support systems in their lives. Implications for practice and future research are discussed, in light of the new English policy context.  相似文献   

荧光光谱法研究黄豆苷原与牛血清白蛋白的相互作用     

宋胜梅  罗小芹  徐茂田 《商丘师范学院学报》2011,27(3):58-62

用荧光光谱法在pH7.4的PBS中研究了黄豆苷原（Daidzein,Da）与牛血清白蛋白（bovine serum albu-min,BSA）的相互作用.结果表明Da可静态猝灭BSA的内源荧光,温度升高时受动态猝灭的影响变得明显.二者之间的结合位点数约为1.5,315 K、310 K,300 K和290 K时的表观结合常数分别为5.44×104L.mol-1,5.70×104L.mol-1,5.29×104L.mol-1和5.69×104L.mol-1.焓变为0.2969 kJ.mol-1,熵变为91.78为J.mol-1.K-1,各温度下的自由能变均小于零,热力学参数表明二者之间主要靠静电力发生作用,熵变对反应过程具有较大贡献,且反应是自发过程.同步荧光光谱表明Da的加入改变了BSA的构像,使色氨酸残基的微环境亲水性增强.本研究对于阐明Da与蛋白的相互作用机理具有借鉴意义.  相似文献   

几何学中的升维类比与发现     

杨在荣  屈红萍 《保山师专学报》2011,30(5):68-71

数学的发现与数学的论证是数学的两大重要内容,如果没有数学的发现则论证就成了无源之水,无本之木;如果没有论证,命题的真假就不得而知,则发现就失去了意义。阐述了几何学中的升维类比与发现,一是命题的发现,二是论证的思想方法的发现。  相似文献   

一类新超混沌系统及其自同步   总被引：2，自引：0，他引：2  

高智中 《常熟理工学院学报》2011,25(8):31-34

基于一个三维混沌系统构造了一个新的四维超混沌系统,利用系统的分岔图、Lyapunov指数谱图和相图分析方法研究了该系统的运动规律．根据线性系统稳定性定理,设计了一种非线性反馈控制器,实现了该超混沌系统的自同步,数值模拟结果验证了理论分析的正确性．  相似文献   

取代基酞菁铜的合成与表征     

夏道成  姚纪欢  韩双  马会宣  刘慧景 《雁北师范学院学报》2011,27(2)

首先以3,6-二羟基邻苯二甲腈和氯代正丁烷为起始反应物,在无水碳酸钾的催化作用下,经亲核取代反应,在DMF（N,N-二甲基甲酰胺）溶剂中合成了中间配体3,6-二丁氧基邻苯二腈,再以此配体和氯化亚铜为前体,采用DBU液相催化法合成了周边烷氧基取代的1,4,8,11,15,18,22,25-八丁氧基酞菁铜,经过元素分析、红外、荧光、紫外可见光谱和原子吸收表征证明,产物就是目标化合物取代基酞菁铜。  相似文献   

Getting good at small talk: student-directed learning of social conversation skills     

Veerle Garrels 《欧洲特需教育杂志》2019,34(3):393-402

For students with autism spectrum disorders (ASD), learning social skills is an intricate but essential task to facilitate social inclusion and participation. Limited research is available on social skills interventions for adolescents with ASD and intellectual disabilities (ID). This article presents a case study that illustrates how the Self-Determined Learning Model of Instruction was used to improve self-chosen social conversation skills in a Norwegian 14-year old student with ASD and mild ID. This case study illustrates that, also for students with ASD and ID, giving them the opportunity to set personally relevant goals may improve their autonomous motivation, thereby increasing the likelihood of goal attainment.  相似文献