Time-Varying Effect Sizes for Quadratic Growth Models in Multilevel and Latent Growth Modeling

Multilevel and latent growth modeling analysis (GMA) is often used to compare independent groups in linear random slopes of outcomes over time, particularly in randomized controlled trials. The unstandardized coefficient for the effect of group on the slope from a linear GMA can be transformed into a model-estimated effect size for the group difference at the end of a study. Because effect sizes vary nonlinearly in quadratic GMA, the effect size at the end of a study using quadratic GMA cannot be derived from a single coefficient, and cannot be used to estimate effect sizes at intermediate time points with backward extrapolation. This article formulates equations and associated input commands in Mplus for time-varying effect sizes for quadratic GMA. Illustrative analyses that produced these time-varying effect sizes were presented, and a Monte Carlo study found that bias in the effect sizes and their confidence intervals was ignorable.     

一种增强关键服务可生存性的应急算法

为了解决"何时对应急服务进行响应是合适的?"这一问题,提出了一种增强关键服务可生存性的应急算法.首先,基于中心极限定理和假设检验理论,分别计算求得各关键服务在主、备服务器上的历史平均服务响应时间的置信区间,并且提出了一种基于时间滑动窗口的置信区间动态更新的方法;然后,根据主、备服务器上服务响应时间置信区间的5种分布情况,提出的算法可以为应急服务在不同的时间响应区选择合适的应急策略,如资源重配、服务降级或者服务迁移等,以此保证关键服务请求能够在用户期望的服务截止期内完成,且整个配置过程对用户透明.最后,仿真试验表明了该算法的可行性.     

激发数学学习兴趣的教学探索

结合具体的实例,论述了在高等数学教学过程中调动学生学习积极性和激发学生学习兴趣的一些方法。     

Confidence is Everything” – Perspectives of Teachers and Students on Learning Mathematics

This paper problematises confidence as a frequently used explanation for performance in the mathematics classroom. I report on an interview-based study of how some English Advanced level (16+) students who have chosen to study mathematics, and their teachers, speak about confidence with respect to the learning of mathematics. I outline what constitutes confident learners for these teachers and, differently, for their students and what the students feel teachers could do to improve the students confident state. I discuss the implications of this for the education of prospective teachers of mathematics.     

多元因素对大学新生英语听力的影响及对策

通过实地抽样调查，总结、归纳出影响英语初学听力的多种障碍，并从不同的角度，通过实际例子来分析产生这些障碍的原因以及克服这些障碍的具体对策。     

成就动机对自信与A型行为关系的解释作用

为了检验成就动机能否解释自信与Type A的相关，确定自信与Type A相关的性质，采用总体自信问卷、中国人A型量表和成就动机量表为工具，对自信与Type A的关系进行了探讨。结果发现，自信确实与Type A存在先前研究发现的正相关，但与其敌意因子呈负相关；控制成就动机成分后，自信与Type A的正相关关系消失，而与敌意因子的负相关关系不受影响。自信与Type A的关系体现了自信的成就动机功能，是积极的而不是消极的。     

基于中华优秀传统文化对大学生文化自信培养路径的探索

中华优秀传统文化是华人的根脉,具有深刻的思想内涵,是新时代中国发展的内生驱动力。高校应在推动传统文化传承与繁荣的基础上,对学生进行多层次、立体式的中华优秀传统文化教育模式,探索文化自信培养路径建构,对提高大学生传承和弘扬传统文化、坚定文化自信具有深远意义,为实现伟大中国梦增添青年力量。     

学困生学习心理障碍分析及对策研究

教学实践和现代心理学研究表明：学困生在学习心理上存在明显的自卑感、失落感，具有胆怯心理、压抑心理、惰性心理和逆反心理，上课时注意力不集中．在教学中，帮助学困生消除学习上的心理障碍的对策有：帮助他们增强学习的信心，培养他们的学习兴趣，定期作学法指导，开展一帮一活动，实施分层次指导和成功教育是实现学困生转化的有效途径．     

Teaching physics in junior high school: crossing the borders of fear

Israeli junior high‐school science teachers usually have a background in biology, and their knowledge of physics is limited. We show that by improving teachers' qualitative understanding it is possible to increase their confidence and willingness to teach physics. We conducted three‐day workshops for teachers (n = 92), which were followed by ongoing activities and support. The teacher workshops were based on a new qualitative approach that we developed for studying mechanics, which has been shown to be effective with students. A study of teachers who had not participated in the workshop shows that they had the same conceptual difficulties as their students. A comparison of pre‐ and post‐workshop questionnaires indicates that the participating teachers gained self‐confidence in their ability to explain everyday phenomena, changed their views about the relevance and interest of physics to the students and were willing to implement the method in their classes.     

我国企业应对生态反倾销竞争情报体系建设研究

我国出口产品生态效率偏低,容易招致国外生态反倾销指控。建立以企业为主体,行业协会为支撑,政府为主导,信息服务机构为中介,多元一体,协同联动的竞争情报体系,收集国内外相关情报信息,并进行加工、整理、分析与研究,是有效应对反倾销的重要手段。本文构建了应对生态反倾销的竞争情报体系建设指标,并应用带置信度的灰色聚类评估模型对其进行科学合理地评价,有利于改善企业竞争情报体系的建设现状,提高中国出口企业应对生态反倾销的能力。