中日竞走运动员高原训练期间心率变化的分析

本文通过中国（世居高原），日本（世居平原）各１０名竞走运动员在海拔２３６６ｍ和海拔１０ｍ训练期间静息心率和运动心率变化的研究（其间采用了短期去３２００ｍ和１５７０ｍ的训练）发现，经高原训练，静息心率和运动心率的良好变化与运动成绩的提高是一致的，心率变化可作为评价运动员在高原的适应情况和检验高原训练效果的一项敏感指标．     

从"学生诉讼学校"谈体育安全事故纠纷的预防

对学生参与学校体育部门组织的体育教学、课余竞赛等活动出现安全事故而诉讼学校这一现象进行分析,探析这一现象产生的原因与后果,并提出预防性措施.     

即时测量脉率掌握最佳负荷量

脉率反映的身体负荷量近年来已被人们认为是位身投炼的理想指标,本文介绍了即时测量脉率掌握最佳负荷量的方法,以指导全民健身活动。     

激光脉宽对熔融石英中超连续光谱的影响

理论研究飞秒激光脉宽、啁啾和初始光谱对其在熔融石英中成丝产生的超连续光谱的影响.结果表明:在固定能量下,脉宽越大,蓝移截止波长越长,光谱强度越低.对脉宽大于150 fs的激光,负啁啾脉冲比无啁啾和正啁啾脉冲产生的蓝移光谱强度更大.     

Principal component analysis of colour measurements of patinas and coating systems for outdoor bronze monuments

Principal Component Analysis (PCA) was applied on colour measurements performed on outdoor bronze patinas and protective coating systems on bronze coupons in order to monitor natural weathering and cleaning effects. PCA chemometric technique is shown to be a powerful tool to analyse the large measurement data set which is needed to characterise these kinds of system. The results are compared with previous work where the CIELAB L*a*b space was used, in order to spot the advantages and disadvantages of both techniques and how they can complete each other in order to set up a workflow when dealing with large datasets of colour measurements. As previously stated, quicker colour variations in the early stage of natural weathering of bronze coupons are characterised, which is mainly due to lightness reduction. PCA analysis helps to visualise the different behaviour upon cleaning procedure of different monument patinas and colour difference reduction due to cleaning. It gives the advantage in a first screening phase to possibly highlight the presence of outliers, check the level of noise in the spectra, and select the variables which carry more information. Its integration in a workflow for colour measurement can help in speeding up the process of later analysing data with the well-established CIELAB system.     

An evaluation of daylight distribution as an initial preventive conservation measure at two Smithsonian Institution Museums, Washington DC, USA

This paper presents the results of a light levels survey conducted at the Donald W. Reynolds Center for American Art and Portraiture in Washington DC. The museum space is shared by the National Portrait Gallery and the Smithsonian American Art Museum. After six years of extensive renovations, the building reopened to the public in July 1, 2006. The structure was not originally designed to house a museum collection since it contains numerous openings such as windows, doors and skylights, which provide a path for natural radiation to enter the building and come in contact with the artworks. From a preventive conservation standpoint, this is an important problem since sensitive works of art in the collection may be subjected to damage caused by light exposure. Environmental data loggers installed throughout the museum were programmed to take successive measurements every 10 min for 24 h a day, 7 days a week and 52 weeks a year. This light levels assessment started in November 1, 2007 and finished in October 31, 2008. This study presents a new method for determining natural radiation exposures registered in exhibition spaces that rely on both electric lighting and natural lighting, considering the growing trend of using daylight illumination in museums.     

浅谈微机控制中的滤波方法

在微机应用系统中,由于干扰的存在,常需对样信号进行滤波处理,本文介绍了几种常用的数字滤波方法。     

电动自行车调速系统模型

电动自行车调速系统是在不影响试验效果的前提下,用性能相似的便宜元件、现有的设备替换较贵的元件和需要购买的设备来达到降低实验成本的目的。     

基于VB的口腔模型测量系统的设计与实现

针对手工测量口腔模型过程复杂、结果数据误差较大的现状,介绍了一种用VB6.0实现的口腔模型测量系统,对程序的主要功能及实现细节作了详细说明,并给出了部分源程序。