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Motor skills matter to physical activity——At least for children

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Journal of Sport and Health Science 2013年第1期2卷 58-59页

作者： ang chen Department of Kinesiology University of North Carolina at GreensboroGreensboroNC 27412USA

Physical activity(PA) is an effective means of curbing the prevalence of child obesity,and fundamental skills are hypothesized to be an important factor that determines physically active or inactive behavior in *** evidence suggests that adolescents and young adults with proficient motor skills in sport-related activities are more likely to have a physically active lifestyle.1 Because

关键词：学龄前儿童运动体力预测能力生活方式成年人患病率肥胖症

Exercise facilitates memory:Implications for helping youngsters learn in school

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Journal of Sport and Health Science 2012年第1期1卷 5-6页

作者： ang chen Department of Kinesiology School of Health and Human SciencesUniversity of North Carolina at GreensboroGreensboroNorth Carolina 27412USA

Up to this day I still can vividly remember a routine in my elementary school:the daily school-wide morning calisthenics. It started at about 7:45 am in the school *** physical education teacher stood on the concrete stage where our principal would give her talk at school *** children and teachers would follow the teacher’s lead to do the eight-segment national calisthenics in unison with loud music from loudspeakers affixed on trees around the *** I visited the school last May,I saw that students still performed the routine faithfully but with a different set of

关键词： helping routine remember morning visited elementar

Synthesis of Biomimetic Superhydrophobic Surface through Electrochemical Deposition on Porous Alumina

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Journal of Bionic Engineering 2011年第2期8卷 122-128页

作者： Jiadao Wang ang Li Haosheng chen Darong chen State Key Laboratory of Tribology Tsinghua University Beijing 100084 P. R. China

The superhydrophobicity of plant leaves is a benefit of the hierarchical structures of their surfaces. These structures have been imitated in the creation of synthetic surfaces. In this paper, a novel process for fabrication of biomimetic hierarchical structures by electrochemical deposition of a metal on porous alumina is described. An aluminum specimen was anodically oxidized to obtain a porous alumina template, which was used as an electrode to fabricate a surface with micro structures through electrochemical deposition of a metal such as nickel and copper after the enlargement of pores. Astonishingly, a hier- archical structure with nanometer pillars and micrometer clusters was synthesized in the pores of the template. The nanometer pillars were determined by the nanometer pores. The lbrmation of micrometer clusters was related to the thin walls of the pores and the crystallization of the metal on a flat surface. From the as-prepared biomimetic surfaces, lotus-leaf-like superhydrophobic surfaces with nickel and copper deposition were achieved.

关键词： porous alumina electrochemical deposition anodization superhydrophobic surface bioinspired hierarchical structure

A clash of fundamental assumptions:Can/should we measure physical literacy?

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Journal of Sport and Health Science 2020年第2期9卷 149-151页

作者： ang chen Department of Kinesiology University of North Carolina at GreensboroGreensboroNC 27412USA

The special issue of the Journal of Teaching in Physical Education (JTPE)~1 on physical literacy (PL) has provided much needed information about measuring and assessing student learning in terms of the well-defined and yet abstract *** authors have elaborated from diverse educational and psychometric perspectives on the development of the construct,the measurement model,and the assessment of the *** this attempt,many issues associated with the conception of PL were clarified and insightful information and arguments were brought *** this regard,the special issue has moved our understanding of the concept one step *** importantly,it points to a possibility to actualize the teaching of the concept in physical education (PE).

关键词： has clarified insight

Effects of exergaming and the physical education curriculum

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Journal of Sport and Health Science 2013年第3期2卷 129-130页

作者： ang chen Department of Kinesiology University of North Carolina at Greensboro

From an education perspective,play has always been viewed as an integral part of learning experiences1and physical activity is a major component in many games that children *** recent two decades,rapid

关键词：体育馆视频游戏课程组成部分移动设备物理教育电脑显示器电视屏幕

3D酰胺质子转移成像和小视野扩散加权成像预测直肠腺癌病理分级的价值

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中国医学影像学杂志 2025年第1期33卷 63-67页

作者：刘锦王虹朱小飞崔武勋陈昂王玉瑶空军军医大学唐都医院放射科陕西省功能与分子影像重点实验室陕西西安710038 空军军医大学西京医院放射科陕西西安710038

目的探讨3D酰胺质子转移成像(3D APT)和小视野扩散加权成像(rFOV DWI)在预测直肠腺癌病理分级中的应用价值。资料与方法回顾性分析空军军医大学唐都医院2020年2月—2023年4月经病理证实的64例直肠腺癌患者资料,其中高分化组28例,中低分... 详细信息

目的探讨3D酰胺质子转移成像(3D APT)和小视野扩散加权成像(rFOV DWI)在预测直肠腺癌病理分级中的应用价值。资料与方法回顾性分析空军军医大学唐都医院2020年2月—2023年4月经病理证实的64例直肠腺癌患者资料,其中高分化组28例,中低分化组36例。术前采集MRI序列,包括小视野高分辨T2WI、rFOV DWI及3D APT。2名医师逐层勾画肿瘤实性部分,提取其表观扩散系数(rADC)及非对称磁化转移率(MTRasym)值。使用二元Logistic回归构建联合参数(MTRasym+rADC)诊断模型。利用受试者工作特征曲线评估单一及联合参数模型的诊断效能。结果中低分化组MTRasym平均值[(2.93±0.61)%]高于高分化组[(1.74±0.63)%](t=-7.60,P<0.001),rADC平均值[(0.98±0.17)×10^(-3) mm^(2)/s]低于高分化组[(1.19±0.18)×10^(-3) mm^(2)/s](t=4.50,P<0.001)。与MTRasym及rADC相比,联合参数模型鉴别直肠腺癌组织病理分级的诊断效能最高,其曲线下面积为0.94,敏感度及特异度分别为0.86、0.96。结论3D APT和rFOV DWI有助于鉴别直肠腺癌的病理分级。

关键词：直肠肿瘤腺癌酰胺质子转移成像小视野扩散加权成像磁共振成像肿瘤分级预测

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On childhood obesity prevention:"Exercise is medicine" vs."exercise is vaccine"

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Journal of Sport and Health Science 2012年第3期1卷 172-173页

作者： ang chen Department of Kinesiology University of North Carolina at Greensboro

The most recent report on the obesity epidemic by the U.S. Institute of Medicine(IOM) has painted a bleak picture of reality in the *** reports that two third of adults and almost one third of children are either overweight or obese by any counts of *** in other countries do not seem optimistic *** to the World Health Organization (WHO),the numbers of obese children have increased during the last decade to an estimated 35 million in developing countries and 8 million in developed

关键词： obesity vs childhood exercise obese children vacci

The expectancy-value theory:A meta-analysis of its application in physical education

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Journal of Sport and Health Science 2023年第1期12卷 52-64页

作者： Chaojie Shang Alexander Clayton Moss ang chen Department of Kinesiology University of North Carolina at GreensboroGreensboroNC 27412USA

Background:The purpose of motivating students is to enhance their learning *** expectancy-value theory(EVT)has demonstrated its efficacy in motivating students in classrooms and in *** student motivation in physical education is *** metaanalysis review aimed to reveal the determinants and functions of EVT by evaluating the evidence in physical education ***:We followed the Preferred Reporting Items for Systematic Review and Meta-Analyses(PRISMA)guidelines to identify and meta-analyze the current research literature published from January 2010 to December 2020 by generating and analyzing the effect sizes from the ***:A total of 31 studies were *** results show that social support,motivation of teachers and peers,and positive class climate can predict student EVT *** motivation predicts student learning behaviors,situational interests,fitness performance,health behavior function,out-of-school physical activity,and physical skill ***:EVT motivation could facilitate learning behaviors and situational interest development in the *** might lead to fitness enhancement,health behavior change,out-of-school physical activity participation,and physical skill *** a learning environment with a mastery-centered and/or student autonomy approach where students perceived success and the task values can enhance and maximize student EVT motivation and learning achievement.

关键词： K-12 students Learning strategies Student outcomes

Modeling and flapping vibration suppression of a novel tailless flapping wing micro air vehicle

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Chinese Journal of Aeronautics 2022年第3期35卷 309-328页

作者： Siqi Wang Bifeng SONG ang chen Qiang FU Jin CUI School of Aeronautics Northwestern Polytechnical UniversityXi'an 710072China Yangtze River Delta Research Institute of Northwestern Polytechnical University Taicang 215400China Research&Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen 518057China School of Aeronautic Science and Engineering Beihang UniversityBeijing 100083China

This paper establishes and analyzes a high-fidelity nonlinear time-periodic dynamic model and the corresponding state observer for flapping vibration suppression of a novel tailless Flapping Wing Micro Air Vehicle(FWMAV),named ***,a complete modeling of NPU-Tinybird is determined,including the aerodynamic model based on the quasi-steady method,the kinematic and dynamic model about the mechanism of flapping and attitude control,combined with the single rigid body dynamic *** on this,a linearized longitudinal pitch dynamic cycle-averaged model is obtained and analyzed through the methods of neural network fitting and system identification,preparing for the design of flapping vibration suppression *** vibration is an inherent property of the tailless FWMAV,which arises from the influence of time-periodic aerodynamic forces and *** can be captured by attitude and position sensors on the plane,which impairs the flight performance and efficiency of flight controller and *** deal with this problem,a novel state observer for flapping vibration suppression is designed.A robust optimal controller based on the linear quadratic theory is also designed to stabilize the closed-loop *** results are given to verify the performance of the observer,including the closed loop responses combined with robust optimal controller,the comparison of different parameters of observer and the comparison with several classic methods,such as Kalman filter,H-infinity filter and low-pass filter,which prove that the novel observer owns a fairly good suppression effect on flapping vibration and benefits for the improvement of flight performance and control efficiency.

关键词： Flapping vibration Flapping wing Linear quadratic theory Robust control State observer