The effect of concept cartoon-embedded worksheets on grade 9 students’ conceptual understanding of Newton’s Laws of Motion

Background: A substantial review study of concept cartoons reports that few studies have indicated their functions. For this reason, the present study illuminates the extent to which concept cartoon-embedded worksheets (through constructivist context) accomplish these functions in conceptual learning.

Purpose: The purpose of the study is to determine the effect of the concept cartoon-embedded worksheets on grade 9 students’ conceptual understanding of Newton’s Laws of Motion.

Sample: Within a quasi-experimental research design with control group, the sample consisted of 102 grade 9 students (aged 15–16 years) enrolled in an Anatolian High School. They were randomly assigned to control (52 students) and experimental groups (50 students).

Design and methods: While the control group followed the existing physics instruction, the experimental one was exposed to the concept cartoon-embedded worksheets. To collect data, two scales (Newton’s Laws of Motion Test –NLMT– and Interview about Instances –IAI) were employed.

Results: The results indicated that the experimental group performed better than did the control group.

Conclusions: It can be deduced that the concept cartoon-embedded worksheets are effective in improving grade 9 students’ conceptual understanding and in replacing their alternative conceptions with scientific ones.     

运动估计中三步搜索算法的并行设计与实现

在对现有三步搜索算法研究的基础上,通过理论分析,对三步搜索算法进行了并行设计与实现。     

刚体定点运动的有限转角应是轴矢量

从运动的叠加原理和定点运动的欧拉定理，按逻辑和理论的自洽性，说明定点运动的有限转角应是轴矢量；分析两次有限转动不能对易从而认为有限转角不是失量的例证的错误根源；阐述代表刚体定点运动的两种实际转动可以对易，从而论证刚体定点转动的有限转角的轴矢量性．     

一种SAR运动参数估计及成像方法基于DCFT变换

SAR运动参数估计是SAR成像技术研究中的一项关键技术,目前国际上普遍采用的方法是GPS INS导航系统进行运动参数估计。国内由于技术等方面的原因导航参数的估计精度远远不能满足SAR成像要求,目前只能从回波中提取平台运动参数,其中较为典型的方法是PGA、子孔径相关法等,而DCFT作为一种新的CHIRP信号参数估计方法能快速、精确的估计CHIRP信号的相关参数。本文提出利用DCFT方法估计SAR运动参数,并以此为基础对传统的RD成像算法加以改进,提出了一种基于DCFT变换的改进RD成像算法。     

简谐振动运动方程的推导

本文从不同的物理角度 ,导出了简谐振动的运动方程     

Motion texture using symmetric property and graphcut algorithm

INTRODUCTIONRecent advances in motion capture techniques and other motion editing software facilitate character animation with unprecedented ease and realism. It is still an important and active research area to synthe- size the realistic character animation with the motion capture data. Due to the restriction in recorded motion capture data, the direct reuse of long motion capture data is unacceptable, and thus a novel method to edit them is needed. In response, motion textures (Li et al…     

支持多种产品的移动学习管理系统

本文介绍的Porta-bile项目正在特伦托大学(University of Trento)开展,旨在研究移动计算技术在教育环境中对学习过程的支持作用.这个项目主要关注移动学习中的技术因素,它们与e-Learning系统的整合以及与学术机构的信息系统的整合.这个项目是建立在特伦托大学经济学院使用的e-learning学习平台的大量源代码研究以及对整个特伦托大学使用的新平台所收集的大量经验和数据基础上.     

电子提花机用电磁阀若干性能参数分析

讨论并分析了电子提花机电磁阀的磁路状况、受力特性和运动时间，提出了在不同磁路工作状态采用不同供电电压的方案，并结合实际情况作了具体计算。     

运动技术分析诊断现状述评

目的介绍运动技术分析诊断中运动学、动力学、肌电学测量的实践应用情况。方法文献资料法与逻辑分析法。结果和结论表明运动技术分析诊断的测量方法不仅应用于竞技与健身的体育活动中,而且在艺术创造与运动康复中也发挥积极作用。     

Determinants of the half-turn with the ball in sub-elite youth soccer players

We explored the biomechanics of the 180° change-of-direction with the ball (half-turn) in soccer. We aimed at identifying movement strategies which enhance the players’ half-turning performance, by characterising technique kinematics and understanding the structure of biomechanical and anthropometrics variables. Ten Under-13 sub-elite male players were recorded with an optoelectronic motion analyser while performing a 5-m straight dribbling followed by a half-turn with the sole. Joints kinematics differences between faster and slower trials were found in support-side hip rotation, driving-side hip adduction, trunk flexion and rotation, and arms abduction. To unveil the data-set structure, a principal component (PC) analysis and a stepwise linear discriminant analysis were performed using 30 biomechanical parameters and four anthropometric variables for each trial. Seven retained PCs explained 79% of the overall variability, featuring combinations of original variables that help in understanding the factors facilitating fast half-turns: keeping short steps, minimising lateral and forward body movements, and centre-of-mass lowering, even with ample lower limbs ranges of motion (RoM); abducting the upper limbs while limiting trunk flexion and pelvic inclination RoM. Balance and task-constrained exercises may be proposed to improve this technique. Moreover, a quantitative knowledge of the movement structure could give coaches objective insights to better instruct young players.