大学课堂多媒体英语教学中的现状及反思

目前多媒体技术已经被广泛地运用在各种教学活动之中。把多媒体技术合理地运用在教学过程中,能有效地激发学生的学习兴趣和积极性,丰富课堂教学内容,提高教学效果。但是,过度依赖多媒体教学工具,会让学生难以把握教学重点和难点,也无法提高学生的学习兴趣。英语教师应根据教学目标和要求,精心制作课件,提高课件的艺术性,把传统教学手段和多媒体教学工具结合起来,加强与学生之间的情感交流,才能充分发挥多媒体教学的优势。     

The effects of school social mix: unpacking the differences

Whether school composition makes a difference for student outcomes has been the subject of much controversy. This article draws on Growing Up in Ireland data, a rich source of information on nine-year-old children along with the characteristics of their school and classroom teacher. In contrast to many studies which rely on a single measure of social background, the use of a range of measures (including social class, parental education and income) allows us to provide precise estimates of differences in performance between schools designated as disadvantaged and other schools. The analyses also provide new insights into the processes underlying such differences. Only the most disadvantaged schools, those in Urban Band 1, are found to have a contextual effect for both reading and mathematics. This achievement gap is found to reflect differences in teacher experience and turnover, the concentration of additional learning needs, absenteeism levels and children's engagement in school.     

混搭与跨界——试论中秋月饼的包装设计

"中秋"是中国传统的节日,赏月、吃月饼是传统的习俗。月饼是象征中秋佳节的一种商品。其包装设计和内容随着人们生活质量的不断改善而改变,传统的月饼包装不再能满足人们的审美需求,逐渐出现了的"混搭"风潮,其效应引导消费模式,带动消费者消费,势必引起"跨界"潮流在月饼包装设计中的出现。新的包装设计理念的注入,使传统的节日馈赠品有了新的外衣,开始阐释它新的意义。     

Cracking behaviors and crack control of self-consolidating concrete: a review of literature

Cracking in concrete occurs from volumetric instability, mechanical loading, and/or environmental attack. Compared to conventional vibrated concrete, self-consolidating concrete often has a higher susceptibility to crack due to different mixture design, material properties and construction practices. To obtain a better understanding of self-consolidating concrete cracking behaviors for designing and constructing crack-controlled structural elements, reported current research and practices are reviewed and analyzed in this paper. It has been believed that when well designed and well constructed, high quality self-consolidating concrete can be successfully used in various structures with cracks properly controlled.     

现有大学文科数学教材中存在不足的思考

教材的质量和水平很大程度上决定着教学的质量与水平.面对不同学生群体的教材应该具有针对性.现有大学文科数学教材普遍存在针对性不足的问题,对此,进行以下几个方面的思考:对于定义,删繁就简突出重点;对于例题,旁征博引提高兴趣;对于思想,融会贯通启发体会。     

高寒地区混凝土面板堆石坝趾板混凝土配合比的试验研究

高寒地区混凝土面板堆石坝趾板混凝土对抗冻性有特别高的要求,针对抗冻性F300这一关键性的技术指标对其进行配合比对比试验研究分析,拟合得到28d抗压强度与胶水比的关系式,选择出了既满足性能要求又为经济的配合比。     

高掺量粉煤灰混凝土的力学性能试验研究

介绍了在水泥混凝土中 ,采用粉煤灰替代 30 %水泥的高掺量粉煤灰混凝土的配合比设计 ,以及试件力学性能的室内实验结果。为了控制混凝土各龄期的强度等力学性能 ,在实验研究过程中 ,粉煤灰采用超量替代 ,超量系数为 1.4。     

低压聚氨酯发泡机混合头设计

设计了一种新型的低压聚氨酯发泡机混合头,采用两步搅拌以及隔离发泡剂技术,解决了传统发泡机混合头存在搅拌不均匀以及容易堵塞等问题。试验表明：新型混合头设计大大提高了发泡机的生产效率。     

政府补贴、税收优惠及其政策组合对科技企业孵化器绩效的影响——基于不同生命周期的实证研究

从政策组合视角探讨政府财税政策对孵化器绩效产生的影响，以及处于不同生命周期孵化器受影响的差异，为促进政府完善有关财税政策设计、推动科技企业孵化器高质量发展提供参考。基于广东省781家科技企业孵化器数据构建Logit多元回归模型，通过倾向得分匹配方法对倾向得分进行样本匹配，计算不同的财税政策及其组合对孵化器孵化绩效的平均处理效应。结果表明：政府补贴与税收优惠对科技企业孵化器孵化绩效均有显著促进作用，但两种政策组合的促进效果更为显著；对不同生命周期孵化器孵化绩效的影响具有异质性，两种政策组合对成长期与成熟期孵化器的孵化绩效均有显著促进作用，而仅受到政府补贴只对成长期孵化器的孵化绩效有显著促进作用，仅受到税收优惠的影响则均不显著。因此，提出政府在优化单项财税政策的同时灵活使用不同政策组合，并根据孵化器所处的不同生命周期进行调整，从而更有效地提升孵化器的孵化绩效。