Optimal sampling frequency in recording of resistance training exercises

The purpose of this study was to analyse the raw lifting speed collected during four different resistance training exercises to assess the optimal sampling frequency. Eight physically active participants performed sets of Squat Jumps, Countermovement Jumps, Squats and Bench Presses at a maximal lifting speed. A linear encoder was used to measure the instantaneous speed at a 200 Hz sampling rate. Subsequently, the power spectrum of the signal was computed by evaluating its Discrete Fourier Transform. The sampling frequency needed to reconstruct the signals with an error of less than 0.1% was f_99.9 = 11.615 ± 2.680 Hz for the exercise exhibiting the largest bandwidth, with the absolute highest individual value being 17.467 Hz. There was no difference between sets in any of the exercises. Using the closest integer sampling frequency value (25 Hz) yielded a reconstruction of the signal up to 99.975 ± 0.025% of its total in the worst case. In conclusion, a sampling rate of 25 Hz or above is more than adequate to record raw speed data and compute power during resistance training exercises, even under the most extreme circumstances during explosive exercises. Higher sampling frequencies provide no increase in the recording precision and may instead have adverse effects on the overall data quality.     

自闭症谱系障碍儿童家长参与课题研究:影响因素和改进策略

近年来,人们越来越多地推动自闭症儿童家长有意义地参与科学研究.这种参与式研究能够更好地满足自闭症谱系障碍儿童及其家庭的评估和干预需求.从自闭症儿童自身特征、家庭因素、研究课题本身等方面分析影响家长参与课题研究的因素,基于对影响因素的综合分析,分别从家长及研究者层面提出相关对策建议,以促进家长更积极、更深入地参与课题研究...     

纹理谱直方图与潜在语义标引在图像检索中的应用

提出一种新的描述局域像素灰度变化的纹理谱方法,并将该方法抽取出的纹理谱直方图特征用于图像检索。实验表明该特征计算简单,检索结果较好,是一种适于图像检索的底层特征。同时将应用于文本检索领域的潜在语义标引方法用于图像检索,并提出了一种计算近似矩阵秩的方法。实验结果显示使用该方法可以分析图像中存在的隐含语义结构,并提高检索效率。     

The perpetrators of medical child abuse (Munchausen Syndrome by Proxy) – A systematic review of 796 cases

IntroductionLittle is known about the perpetrators of medical child abuse (MCA) which is often described as “Munchausen’s syndrome by proxy” or “factitious disorder imposed on another”. The demographic and clinical characteristics of these abusers have yet to be described in a sufficiently large sample. We aimed to address this issue through a systematic review of case reports and series in the professional literature.MethodA systematic search for case reports and series published since 1965 was undertaken using MEDLINE, Web of Science and EMBASE. 4100 database records were screened. A supplementary search was then conducted using GoogleScholar and reference lists of eligible studies. Our search yielded a total sample of 796 perpetrators: 309 from case reports and 487 from case series. Information extracted included demographic and clinical characteristics, in addition to methods of abuse and case outcomes.ResultsNearly all abusers were female (97.6%) and the victim’s mother (95.6%). Most were married (75.8%). Mean caretaker age at the child’s presentation was 27.6 years. Perpetrators were frequently reported to be in healthcare-related professions (45.6%), to have had obstetric complications (23.5%), or to have histories of childhood maltreatment (30%). The most common psychiatric diagnoses recorded were factitious disorder imposed on self (30.9%), personality disorder (18.6%), and depression (14.2%).ConclusionsFrom the largest analysis of MCA perpetrators to date, we provide several clinical recommendations. In particular, we urge clinicians to consider mothers with a personal history of childhood maltreatment, obstetric complications, and/or factitious disorder at heightened risk for MCA. Longitudinal studies are required to establish the true prognostic value of these factors as our method may have been vulnerable to publication bias.     

自闭症儿童家庭援助教育理念探析——以唐山市星之光自闭症培训机构为例

论文在前人研究的基础上,采用参与式观察与访谈相结合的研究方法,对唐山市星之光自闭症培训机构进行深入研究,了解其家庭援助教育理念,并从该理念下教师和家长的角色转变、家庭援助的具体策略等几个方面进行了探讨和分析,以期为自闭症儿童的教育工作提供一些有价值的参考。     

荧光光谱学中的表面活性剂

综述近年来在表面活性剂中荧光光谱学的发展,以及表面活性剂对荧光物质的增溶、增敏机理。展望了今后表面活性剂应用于荧光光谱研究的发展方向。     

情感组织者技术对教师抑郁症的心理治疗

采用情感组织者技术对一名患有重度抑郁症的新上岗青年教师实施临床诊断和治疗.研究者向其大脑中输入一组"情感先行组织者"的程序性知识,使其在非药物干预条件下不仅能在短时间内改变原来的重度抑郁和过敏性焦虑情绪反应,而且迅速塑造了这位新教师的积极生活态度和健康的认知行为系统,根本性地结束了其抑郁症的所有临床症状.此个案初步证明了情绪组织者技术在抑郁症治疗中的有效性.     

对幼儿园中孤独症幼儿的感觉统合训练

孤独症是发生于儿童早期的一种涉及感知觉、情感、言语、思维和动作与行为等多方面的发育障碍。目前已有许多孤独症幼儿进入普通幼儿园或孤独症幼儿园中接受早期教育。本文探讨在幼儿园对孤独症幼儿进行感觉统合训练的意义,并重点介绍了感觉统合训练的内容,以及在训练过程中应遵循的基本原则。     

平谱射电类星体3C 454.3射电谱指数的演化研究

从各类文献和资料中搜集到平谱射电类星体3C 454.3在射电22GHz和37GHz波段25年来的观测数据。我对这两个波段的时间和流强进行了处理和分析,得到了相应的谱指数,并分析讨论了流强和时间,谱指数和时间,谱指数和流强之间的关系,发现它们之间存在着一定的相关性。     

郑板桥的佛道之缘与他的禅思之乱

郑板桥不仅书画艺术高超,学术思想丰富,其佛道之缘以及禅学思想也受到社会广泛的注意。当然,郑板桥的禅是一种乱禅。他喜游禅林,广泛结交佛道高人,但他并不入佛道;他讲佛理,讲道学又讲儒家之道,所以他既想出世又想入世;他特别崇尚道家的无为思想,但又想经世泽民,常怀干一番大事业的英雄之志。当然,郑板桥三禅虽乱,而儒禅在他的禅学体系中还是占主导地位的。