检索结果-南通市图书馆

Exercise facilitates memory:Implications for helping youngsters learn in school

在线全文

学校读者我要写书评

暂无评论

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

在线全文

学校读者我要写书评

暂无评论

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?

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

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

在线全文

学校读者我要写书评

暂无评论

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

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

在线全文

学校读者我要写书评

暂无评论

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

在线全文

学校读者我要写书评

暂无评论

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

在线全文

学校读者我要写书评

暂无评论

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

Experimental Study on the Effect of Increased Downstroke Duration for an FWAV with Morphing-coupled Wing Flapping Configuration

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2024年第1期21卷 192-208页

作者： ang chen Bifeng Song ZhiheWang Kang Liu Dong Xue Xiaojun Yang School of Aeronautics Northwestern Polytechnical UniversityXi'an 710072China Harbin Institute of Technology Shenzhen 518055China

This paper is based on a previously developed bio-inspired Flapping Wing Aerial Vehicle(FWAV),RoboFalcon,which can fly with a morphing-coupled flapping *** this paper,a simple flapping stroke control system based on Hall effect sensors is designed and applied,which is capable of assigning different up-and down-stroke speeds for the RoboFalcon platform to achieve an adjustable downstroke *** aerodynamic and power characteristics of the morphing-coupled flapping pattern and the conventional flapping pattern with varying downstroke ratios are measured through a wind tunnel experiment,and the corresponding aerodynamic models are developed and analyzed by the nonlinear least squares *** relatively low power consumption of the slow-downstroke mode of this vehicle is verified through outdoor flight *** results of wind tunnel experiments and flight tests indicate that increased downstroke duration can improve aerodynamic and power performance for the RoboFalcon platform.

关键词： Flapping wing aerial vehicle(FWAV) Downstroke ratio Bio-inspired design Morphing-coupled flapping

Effects of dynamical spanwise retraction and stretch on flapping-wing forward flights

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2024年第4期37卷 181-202页

作者： Kang LIU Bifeng SONG ang chen Zhihe Wang Dong XUE Wenqing Yang School of Aeronautics Northwestern Polytechnical UniversityXi’an 710072China Intelligent Aircraft Research Center Chengdu Technological UniversityChengdu 610031China Research&Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen 518057China Harbin Institute of Technology Shenzhen 518055China

Birds and bats retract and stretch their wings dynamically during each flap in level flights, implying intriguing mechanisms for the aerodynamic performance improvement of flapping wings. A numerical investigation into the aerodynamic effects of such bio-inspired concept in forward flights has been performed based on a three-dimensional wing in plunging motion and a twosection wing in flapping motion. The currently considered Reynolds number and Strouhal number are Re=1.5×10^(5) and St=0.3, respectively. During the research, the mean angle of attack is varied in relatively wide ranges to achieve lift-thrust interconversion for the wings. The conclusive results show that dynamical spanwise retraction and stretch has induced three absolutely desirable scenarios for the oscillating wings in forward flights, namely producing more lift and consuming less power for a given thrust generation, producing more thrust and consuming less power for a given lift generation, and producing more lift and more thrust while consuming less power. Furthermore,the morphing wings have alleviated periodical aerodynamic load fluctuations compared with the non-morphing baseline. The mechanism of the aerodynamic effects of the bionic morphing mode is analyzed with the aid of field visualization. The current article is the first to reveal the absolute advantages of the bionic spanwise morphing. Hopefully, it may help comprehend the behaviors of natural fliers and provide inspirations for performance enhancement of micro artificial flappingwing vehicles.

关键词： Flapping wing Morphing wing Bionic Aerodynamics Vortex Flight