基于关键词词频统计的学科研究热点漂移程度模型构建及实证分析

[目的/意义]学科研究热点的发掘有助于了解其发展动向,把握研究方向。热点漂移程度旨在用数据关系描述某一学科某一时间段内的研究热点在接下来一段时期内的变化程度,揭示其热点研究的持续性和规律性。[方法/过程]通过基于学术论文关键词词频统计的文献计量方法,初步构建了研究热点漂移程度计算模型,并通过对"高等教育理论""艺术理论""史学史""自动控制理论""外科护理学"和"建筑经济学"6个学科的实证分析,计算出了这些学科2010年研究热点5年漂移程度。[结果/结论]研究表明,"建筑经济学""史学史"两个学科漂移程度较高,"自动控制理论"和"艺术理论"两个学科居中,"高等教育理论"和"外科护理学"两个学科较低。研究结果具有显著的差异性。热点漂移程度揭示了各学科研究热点的变化程度和关键词词频的分布规律,并在一定程度上体现出了学科的交叉性。     

FIR数字滤波器的设计与仿真

为了减小数字滤波器设计工作量,利用MATLAB软件,采用窗函数法、频率采样法及最优等波纹法设计FIR数字滤波器.通过比较不同设计方法得到的滤波器阶数以及幅频特性曲线,结果表明,最优等波纹法可大大减少了计算的复杂程度,所设计的滤波器简单,是FIR滤波器设计中的最优方法.     

Using iPad tablets for self‐modeling with preschoolers: Videos versus photos

As technology becomes more accessible and acceptable in the preschool setting, teachers need effective strategies of incorporating it to address challenging behaviors. A nonconcurrent delayed multiple baseline design in combination with an alternating treatment design was utilized to investigate the effects of using iPad tablets to display video self‐modeling and activity photos for three preschoolers during circle time. During baseline, all three children demonstrated low levels of engagement and high levels of off‐task behavior compared to peers. The intervention phase consisted of alternating between showing the child the self‐video and photos prior to circle time. A child preference phase was conducted whereby each child self‐selected the video or photo prior to circle time. For all three children both videos and photos led to increased engagement and decreased off‐task behaviors. During the child preference phase, all three children selected the video most frequently. Social validity data demonstrated teacher and child preference for the video self‐modeling condition.     

有关多媒体技术在跆拳道教学中应用的研究

跆拳道运动的教学模式多年来一直是以教师亲身示范、讲解,学生随之学练为主。随着这项运动普及率和运动水平的不断提高,单一的教学模式在某种程度上限制了教学的效果和范围。文章旨在研究和探索一种新的方法和思路来指导跆拳道教学,以达到优化教学内容,提高教学效率的目的。文章从视频反馈教学,CAI课件辅助教学和连拍图片分解技术动作教学三个方面分析多媒体在跆拳道教学中的应用。     

Three-dimensional assessment of squats and drop jumps using the Microsoft Xbox One Kinect: Reliability and validity

The Microsoft Xbox One Kinect? (Kinect V2) contains a depth camera that can be used to manually identify anatomical landmark positions in three-dimensions independent of the standard skeletal tracking, and therefore has potential for low-cost, time-efficient three-dimensional movement analysis (3DMA). This study examined inter-session reliability and concurrent validity of the Kinect V2 for the assessment of coronal and sagittal plane kinematics for the trunk, hip and knee during single leg squats (SLS) and drop vertical jumps (DVJ). Thirty young, healthy participants (age = 23 ± 5yrs, male/female = 15/15) performed a SLS and DVJ protocol that was recorded concurrently by the Kinect V2 and 3DMA during two sessions, one week apart. The Kinect V2 demonstrated good to excellent reliability for all SLS and DVJ variables (ICC ≥ 0.73). Concurrent validity ranged from poor to excellent (ICC = 0.02 to 0.98) during the SLS task, although trunk, hip and knee flexion and two-dimensional measures of knee abduction and frontal plane projection angle all demonstrated good to excellent validity (ICC ≥ 0.80). Concurrent validity for the DVJ task was typically worse, with only two variables exceeding ICC = 0.75 (trunk and hip flexion). These findings indicate that the Kinect V2 may have potential for large-scale screening for ACL injury risk, however future prospective research is required.     

老年人运动行为、就诊次数与生命质量的关系

目的:了解老年人每周运动次数、就诊次数与生命质量的关系。方法:使用问卷调查法,针对65岁以上老年人,获得有效问卷898份,以描述性统计、T检验、单因子变异数分析等统计方法。结果:(1)每周运动5次以上的老年人在生理生命质量(PCS)及心理生命质量(MCS)得分较高,就诊次数较低。(2)与就诊次数相关的是运动次数、性别、年龄、是否参加健康检查、是否罹患慢性病、是否有工作,且达统计学意义。(3)老年人在75岁之后,在就诊次数有突然变差的现象,显示老化的程度在75岁是一个关键点。结论:每周运动3次的老年人,仅在心理生命质量(MCS)有较佳表现,而每周运动五次以上,则在生理生命质量(PCS)及心理生命质量(MCS)上都有较好的表现,同时在就诊次数上也较低,建议老年人采取"低强度、多次数"的运动方式,每周从事5次以上的运动,减少就诊次数,提高生命质量。     

三种除草剂微核效应的比较研究

应用除草剂新农乐、高盖、骠马对蚕豆根尖细胞进行微核诱变试验．结果表明．随着3种除草剂浓度的增加诱发蚕豆根尖细胞微核率增高；对其进行剂量和时间效应测定，结果表现良好的剂量和时间效应关系。显示了3种除草剂均具有一定程度的诱变活性。     

Integrating Video Documentary Into the Classroom: A Community Assessment Assignment

Community assessment is a strategy commonly taught to social work students to identify a community’s strengths and challenges. This article describes the value of using video documentary as part of a community assessment assignment. We identify the advantages of using video documentary in the assessment process and the reporting of findings. We discuss the preproduction, production, and postproduction steps necessary to produce a video documentary and illustrate how such assignments can be incorporated into a social work course. We conclude by identifying the educational benefits accrued to students.     

基于ANSYS的高速包装机的椭圆齿轮模态分析

采用有限元法,建立了椭圆齿轮的动力学模型,通过有限元分析软件ANSYS对椭圆齿轮进行模态分析,得到了椭圆齿轮的前六阶固有频率和对应振型。该方法和所得结果为动态设计提供了参考,同时也为椭圆齿轮系统的动态响应计算和分析奠定了基础。     

An analog front-end circuit for ISO/IEC 15693-compatible RFID transponder IC

INTRODUCTION The rapidly increasing application of radio fre- quency identification (RFID) includes supply chain management, access control to buildings, public transportation, airport baggage, and express parcel logistics (Karthaus and Fischer, 2003; Feldhofer, 2004; Glidden et al., 2004). Using an RFID system is a good approach for automated identification of products. RFID system consists of two major components, an interrogator (reader) and a transponder (tag), composed of an ant…