The Influence of Hygroscopic Materials on the Fluctuation of Relative Humidity in Museums Located in Historical Buildings     

C. Ferreira  V. P. de Freitas 《文物保护研究》2020,65(3):127-141

ABSTRACT

The preservation of artefacts in museum collections is profoundly affected by fluctuations in temperature and, especially, relative humidity (RH). Since the late nineteenth century, many studies have been carried out on the best way to control hygrothermal conditions. In old buildings located in maritime temperate climate zones (such as Portugal) with strong thermal inertia, and which have low ventilation rate (relative to the volume and number of visitors), daily and seasonal hygroscopic inertia may help to assure the maintenance of RH stabilization conditions. The use of expensive active systems may be minimized through the passive behaviour of internal finishing building materials. This work presents the results of an experimental laboratory study conducted in a flow chamber to demonstrate the enormous potential of hygroscopic materials in stabilizing interior relative humidity. Based in these results and in-situ monitoring in a museum housed in a building, located in Porto, with a typical construction of the 1950s (granite masonry and reinforced concrete slabs), a numerical analysis was done to quantify the influence of hygroscopic materials in stabilizing the interior relative humidity.  相似文献   

肌肉形态特征与肌肉力量相关研究   总被引：7，自引：0，他引：7  

张海平 《沈阳体育学院学报》2003,32(1):44-46,53

肌肉力量是人体运动的基本素质 ,与肌肉形态有关 ,更有赖于肌肉的横断面积大小。测量人体肌肉的形态指标或肌肉的横断面积 ,推测肌肉力量 ,并对不同人群的肌肉力量进行比较 ,探索肌肉形态特征与肌肉力量的内在规律 ,这对运动员训练水平的评估、运动损伤的治疗与康复及科学选材等方面都具有十分重要的意义。  相似文献   

关于足球专修课成绩评定问题的探讨     

蔡向阳  朱六一 《武汉体育学院学报》2003,37(5):90-92

采用文献资料法、调查法、因素分析法和实验法，对足球专修学生成绩的评定问题进行了比较系统的综合研究，为制定评定学生足球专项成绩体系和权重等提供了客观依据。建立了技、战术考核评分模式。  相似文献   

Accurate assessment of the brake torque on a rope-braked cycle ergometer     

Gordon  R. S.  Franklin  K. L.  Baker  J.  Davies  B. 《Sports Engineering》2004,7(3):131-138

Sports Engineering - A Monark cycle ergometer is a device globally used in physiological studies to measure the work and energy levels of exercising humans. In this paper a rope-braked cycle...  相似文献   

学生反应水平与学习乒乓球技术的关系研究     

王文兵 《西安体育学院学报》1993,(4)

反应是有机体的重要特点之一,是一种复杂的心理过程。是构成体育运动专门能力的重要因素。本文参考国内外心理测量手段,设计了三种易行实用的测量反应方法并通过对65名学生进行反应水平测试,揭示了在各种反应过程中的个体差异。通过相关分析证明各种反应水平差异与个体在学习乒乓球技术过程中掌握技术状况的关系密切。这一结果为我们科学地进行乒乓球运动员选材、运动训练和在教学中区别对待、因材施教提供了依据。  相似文献   

BIODEX在大腿、膝关节伤后功能诊断及康复中的应用   总被引：1，自引：0，他引：1  

杨静宜  赖柳明 《北京体育大学学报》1993,(2)

42名有大腿前、后群肌肉拉伤或膝关节急、慢性损伤史的运动员为受试者。用BIODEX 多关节等速测力及康复系统测定膝关节屈、伸肌群肌力,取60(°)/s 向心、离心及240(°)/s 向心收缩的最大力矩(PT)等指标,用“评价表格”进行分析评定,并对力矩曲线加以分析。初步认为,力矩曲线异常具有功能诊断参考价值,并可用于选拔运动员时及时发现伤情。参照BIODEX 测试结果,有针对性的进行康复锻炼,可收到良好效果。  相似文献   

学术期刊载文的测度研究   总被引：2，自引：0，他引：2  

陈向敏 《图书馆论坛》2006,26(5):38-40

文章针对人们对学术期刊载文量的绝对数量指标和主观评价标准的单一化误解误用现象，在普赖斯指数的概念基础上开发了关于学术期刊载文量的五种相对性测度，并讨论了这五种相对性测度对载文量隐藏信息的显示作用。  相似文献   

G相对乘积空间中的Ti(i=-1,0,1,2)及次T0分离性     

牟金平 《台州学院学报》2006,28(6):11-13

讨论了G相对乘积空间中的Ti(i=-1,O,l,2)与次T0分离性质．  相似文献   

矩阵方法在点的合成运动中的应用     

樊新权 《贵州教育学院学报》2004,15(2):20-21,35

用矩阵方法对点的合成运动进行分析、研究，推导出求解点的合成运动的矩阵计算公式，这些公式有助于理论力学在计算机上的应用，并对提高理论力学的教学质量可起到积极的作用。  相似文献   

Reciprocal Versus Nonreciprocal Assessment of Knee Flexors and Extensors in Concentric Actions Using the CON-TREX Multijoint Isokinetic Dynamometer: A Reliability Study     

Alex Bliss  Jeanne Dekerle 《Measurement in physical education and exercise science》2019,23(2):118-123

Knee flexor and extensor muscular assessment via isokinetic dynamometry is common practice and established in the research literature. However, reporting assessment methodology regarding reciprocal and nonreciprocal movements is often vague or absent. Such methodological issues are crucial for accurate assessments. Therefore, knee extensor and flexor peak moment using either reciprocal movement or nonreciprocal modalities was assessed. Fifteen participants performed three blocks of five concentric muscle actions at three angular velocities [1: nonreciprocal (maximal active flexion followed by passive extension); B2: reciprocal (maximal active extension followed by maximal active flexion); B3 nonreciprocal (maximal active extension followed by passive flexion)]. ANOVA revealed statistically significant within-subject modality effects for peak knee extensor moment and flexor velocity and modality differences (p < .05). Reciprocal and nonreciprocal assessments give significantly different results, with nonreciprocal giving higher peak moments. Reporting which modality is used is crucial to allow for greater clarity for the reader and practitioner.  相似文献