避暑山庄宫墙的历史变迁     

王嘉宁 《承德职业学院学报》2005,10(4):90-91

避暑山庄宫墙始建于康熙年间,宫墙长近十公里,又称虎皮宫墙.是避暑山庄不可分割的重要组成部分.  相似文献   

Particle Penetration,Emission and Deposition in the Diocesan Museum in Udine,Italy to Assess Soiling of Giambattista Tiepolo’s Wall Paintings     

Chiara Bertolin  Marcin Strojecki  Roman Kozłowski 《文物保护研究》2018,63(5):326-328

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Spectroscopic methods for the analysis of celadonite and glauconite in Roman green wall paintings     

Ligia Maria Moretto  Emilio Francesco Orsega  Gian Antonio Mazzocchin 《Journal of Cultural Heritage》2011,12(4):384

One set of samples from wall paintings of the X^th Regio of Italy containing green colours was analysed exploiting different spectroscopic techniques, aiming to identify the pigments used. The possibility to distinguish between glauconite and celadonite, the most common green pigments used in such paintings, was of particular interest. Samples of celadonite from Monte Baldo and glauconite from Belgium were considered as standard materials for comparison. The results obtained using FTIR, EDS, AAS, Colorimetry, Raman and EPR spectroscopies were compared for the identification of the green pigments.  相似文献   

基于多普勒频谱图的力量项目运动员左室舒张期室壁运动研究     

张戈  李献震  田金凯 《吉林体育学院学报》2016,(1):57-61

通过测定和比较正常人和力量项目运动员在静息和逐级递增负荷运动时，室壁多普勒频谱图上E波和A波峰值速度，研究左室后壁主动松弛和被动充盈功能的变化。结果表明：在静息状态，力量项目组房缩期心房收缩对于左室舒张充盈的贡献小于正常组；在逐级递增负荷中，力量项目组心脏舒张功能的动员表现为同时动用主动舒张储备和左房收缩储备，显示出心脏主动舒张的能力强，左房收缩储备大。  相似文献   

浅谈地下中空薄壁混凝土结构的裂缝防预构造措施     

滕先飞  裴锐 《辽宁科技学院学报》2015,(3):23-24

大尺寸薄壁钢筋混凝土结构,对温度的变化和基础的不均匀沉降较为敏感。制定合理的施工方案,材料的合理选择、施工流程精心组织保证了裂缝控制效果良好。  相似文献   

建立一个安全的校园网访问控制体系   总被引：1，自引：0，他引：1  

程杰 《沈阳教育学院学报》2004,6(4):115-117

校园网在运行过程中面临各种安全威胁，本论文通过对校园网及其应用系统的访问控制体系问题进行分析，就身份认证、防火墙、文件和服务的共享访问以及封锁系统漏洞四个方面提出基于访问控制的安全策略。  相似文献   

浅圆仓侧压力分析     

原方  范量  高新南 《东南大学学报》2004,20(3):356-359

Rankine理论和Coulomb理论均不适合用于浅圆仓的侧压力计算. 基于此, 本文研究了浅圆仓散料侧压力的实际分布规律及计算方法. 根据极限平衡理论, 首先得到散粒体作用在单位周长的仓壁上的合压力, 然后通过严格的数学推导, 得到浅圆仓侧压力的分布规律. 结果表明, 本文结果与实仓试验结果相符, 说明本文公式不论对平堆还是锥堆都比较适合, 而Rankine理论和Coulomb理论用于浅圆仓均有缺陷.  相似文献   

Effects of load mass carried in a backpack upon respiratory muscle fatigue     

Mark Faghy  Sam Blacker  Peter I. Brown 《European Journal of Sport Science》2016,16(8):1032-1038

Purpose: The purpose of this study was to investigate whether loads carried in a backpack, with a load mass ranging from 0 to 20?kg, causes respiratory muscle fatigue. Methods: Eight males performed four randomised load carriage (LC) trials comprising 60?min walking at 6.5?km?h^?1 wearing a backpack of either 0 (LC₀), 10 (LC₁₀), 15 (LC₁₅) or 20?kg (LC₂₀). Inspiratory (P_Imax) and expiratory (P_Emax) mouth pressures were assessed prior to and immediately following each trial. Pulmonary gas exchange, heart rate (HR), blood lactate and glucose concentration and perceptual responses were recorded during the first and final 60?s of each trial. Results: Group mean P_Imax and P_Emax were unchanged following 60-min load carriage in all conditions (p?>?.05). There was an increase over time in pulmonary gas exchange, HR and perceptions of effort relative to baseline measures during each trial (p?p?>?.05). Conclusions: These findings indicate that sub-maximal walking with no load or carrying 10, 15 or 20?kg in a backpack for up to 60?min does not cause respiratory muscle fatigue despite causing an increase in physiological, metabolic and perceptual parameters.  相似文献   

人工挖孔灌注桩施工若干难点技术     

黄家嘉 《茂名学院学报》2002,12(3):58-60

广东发展大厦人工挖孔灌注桩施工中，在穿越软弱土层，施工排水，持力层，入岩的确认以及桩芯混凝土质量控制等方面，为确保桩基础施工质量所采取的有效技术措施。  相似文献   

外墙保温对夏热冬冷地区住宅空调负荷的影响     

宁勇飞  刘泽华  陈刚 《怀化学院学报》2006,25(5):113-115

采用DeST软件,对夏热冬冷地区外墙保温的住宅进行了全年的能耗模拟,分析了不同外墙保温形式对住宅负荷的影响·  相似文献