Iodine-catalyzed aerobic oxidation of o-alkylazoarenes to 2H-indazoles

An iodine-catalyzed aerobic-oxidative C-H functionalization of o-alkylazoarenes to afford 2H-indazoles has been developed. CuI was found to be an effective additive to accelerate the regeneration of iodine in the catalytic cycle. This catalytic system is suitable for both electron-rich and electron-deficient azoarenes and tolerates a variety of functional groups with high yields. A gram-scale reaction was successfully conducted, proving the scalability of this reaction.     

仪器分析理论课程教学实践与探索

仪器分析是一门实践性较强的专业基础课,其原理抽象、理论性强、内容广泛。在分析了仪器分析课程特点及实践教学中出现的问题的基础上,对该课程的教学模式及观念提出了改革措施,以激发学生学习兴趣,提高课堂教学效率,培养学生创新及实践能力。     

多样化高分子专业大综合实验改革探索研究

论述了高分子专业大综合实验的现状和存在的问题,以及多样化高分子专业大综合实验改革的必要性和重要性。结合本校该专业实际情况,设计并实施了一例多样化高分子专业大综合实验。案例实施结果表明,多样化高分子专业大综合实验让学生在比较中理解多种不同的高分子材料及其加工工艺,以及弹性体、填料对不同聚合物多种性能的影响规律。同时,掌握了多种高端科研仪器设备的原理及其使用方法。本改革方案更加全面地强化了学生对各种理论知识的理解,进一步提高了学生的动手能力、科学研究能力和解决问题的能力,为后续的毕业环节和工作奠定了坚实的理论和实践基础。此外,根据本文理念和实施案例,以及不同学校该专业的特色和实验课时对高分子专业大综合实验进行多样化改革,在培养优质高分子专业本科毕业生的同时,可形成各学校特色鲜明的高分子专业大综合实验课程。     

“互联网+教育”助力分析化学课程群建设

在"互联网+教育"和传统课堂教育交融时期,将微课融入传统课堂,逐步向慕课、翻转课程过渡,将专业基础课程和方向课程组建成分析化学课程群新体系,优化教学内容,传授学科思想,提升学生的专业学习兴趣和教学质量。     

What Is a Fraction? Developing Fraction Understanding in Prospective Elementary Teachers

Classroom teachers need a well‐developed deep understanding of fractions and pedagogic practices so they can provide meaningful experiences for students to explore and construct ideas about fractions. This study sought to examine prospective elementary teachers' understandings of fraction by focusing specifically on their use of fractions meanings and interpretations. Results indicated that prospective elementary teachers bring with them to their final methods course a limited understanding of fractions and that experiences in methods courses resulted only in minor improvement of those limited understandings. The limited part‐whole understanding of fractions that prospective elementary teachers entered the course with was resilient. The implications of this study suggest a need for prospective elementary teachers to continue to develop their conceptual understanding of fractions and for changes to the content and instructional strategies of mathematics content courses designed for prospective elementary teachers.     

Is There an Effect of Dysphonic Teachers' Voices on Children's Processing of Spoken Language?

There is a vast body of literature on the causes, prevalence, implications, and issues of vocal dysfunction in teachers. However, the educational effect of teacher vocal impairment is largely unknown. The purpose of this study was to investigate the effect of impaired voice quality on children's processing of spoken language. One hundred and seven children (age range, 9.2 to 10.6, mean 9.8, SD 3.76 months) listened to three video passages, one read in a control voice, one in a mild dysphonic voice, and one in a severe dysphonic voice. After each video passage, children were asked to answer six questions, with multiple-choice answers. The results indicated that children's perceptions of speech across the three voice qualities differed, regardless of gender, IQ, and school attended. Performance in the control voice passages was better than performance in the mild and severe dysphonic voice passages. No difference was found between performance in the mild and severe dysphonic voice passages, highlighting that any form of vocal impairment is detrimental to children's speech processing and is therefore likely to have a negative educational effect. These findings, in light of the high rate of vocal dysfunction in teachers, further support the implementation of specific voice care education for those in the teaching profession.     

物理实验教学新模式的探索与实践

提出了一种新的物理实验教学模式，论述了建立实验教学模式所遵循的基本原则和基本做法，简要介绍实施新的教学模式所取得的教学成果。     

The powers and pitfalls of algorithmic knowledge: a case study

This study examines one child's use of computational procedures over a period of 3 years in an urban elementary school where teachers were using a standards-based curriculum. From a sociocultural perspective, the use of standard algorithms to solve mathematical problems is viewed as a cultural tool that both enables and constrains particular practices. As this student appropriated and mastered procedures for addition, subtraction, multiplication and division, she could solve problems that involved fairly straightforward computations or where she could easily model the action to determine an appropriate computation. At the same time, her use of these algorithms, along with other readily available tools, such as her fingers or multiplication tables, constrained her ability to reflect on the tens-structure of the number system, an effect that had serious consequences for her overall mathematical achievement. The results of this study suggest that even when not directly introduced, algorithms have such strong currency that they can mediate more reform-oriented instruction.     

关于大学生对《大学生体育合格标准》承受能力的研究

以宁波大学为实例,在《大学生体育合格标准》的试行后通过对大学生心理、生理和能力等方面进行综合分析以及通过随机抽样、问卷表调查、座谈会等办法对各种数据(包括达标成绩、身体素质、形态机能、学习成绩)运用均数,标准差等统计方法进行分析处理,结果表明,实施《标准》既必要,也可行.在高校实施《大学生体育合格标准》的条件已基本具备,大学生对《标准》的各项要求是有承受能力的.     

23Na NMR study of ionic mesophases in molten sodium carboxylates

The ²³Na NMR lineshapes are reported for the ionic mesophase and isotropic phase of the melts of sodium n-butyrate and sodium isovalerate. The powder pattern for the central transition typical for the second-order quadrupole effect observed in the mesophase melts is of particular interest. Some analogies to ²³Na behavior in sodium β-alumina are pointed out.