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《Journal of Cultural Heritage》2014,15(2):121-127
One of the major causes of pathologies in our historic buildings is the presence of moisture, particularly rising damp. Since these constructions tended to be built near water lines, to facilitate their supply, and because their walls are mainly made of high porosity materials, the presence of rising damp is constant. Although many historic buildings in Portugal have already been the targets of interventions to eliminate pathologies, the fact is that it has not been possible to do it properly. The treatment techniques available nowadays are quite diverse but all of them have low applicability to historic constructions. Research has been carried out, in this past years, at the Department of Civil Engineering of the University of Coimbra in collaboration with Department of Civil Engineering of the Faculty of Engineering of the University of Porto to try and solve this problem. An old but poorly studied technique has been investigated experimentally and numerically in the past few years: ventilation of the base of the walls. It was experimentally validated to limestone walls 20 cm thick. Numerical investigation has been carried out in order to analyze the influence of different parameters on its efficiency. In this paper we present the results of the latest investigations that have been carried out about the influence of the size of the ventilation channel on its efficiency. 相似文献
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周汉武 《黄冈职业技术学院学报》2009,11(3):29-31
直接蒸发冷却空调对产热量大、气味大、粉尘较多的纺织车间能起到降温、降尘、驱散异味、加强通风与换气的作用,与传统机械制冷空调相比,设备整体投资少、运行费用更省,具有较大的经济效益。 相似文献
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无创正压通气治疗急性左心衰的临床研究 总被引：1，自引：0，他引：1
目的：观察机械通气治疗急性左心衰的疗效。方法：60例急性左心衰患者,随机分为常规治疗组和无创通气组,无创通气组在常规治疗基础上加用机械通气治疗,观察通气前后心率（HR）、呼吸频率（RR）,平均动脉压（MAP）及血气分析（pH、PaO2、SaO2、PaCO2）的变化及临床症状的改善情况。结果：机械通气治疗后,患者呼吸困难明显改善,生命体征很快稳定,血气分析指标明显好转。结论：对各种不同原因引起的急性左心衰,机械通气能及时有效的改善患者的临床症状及低氧血症,是抢救急性左心衰的有效措施。 相似文献
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简述了室内空气品质实时监测的概念及其与精密的实验室测量的区别，前者主要应用于质量检验和仲裁，后者主要是实时阁值报警。重点介绍了作者开发的一种基于单片机和半导体气敏元件的室内空气污染实时监测模块及其应用，内容包括该模块的电路总体功能、传感器信号检测电路设计以及在2套民居的实测应用概况。 相似文献
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文章主要阐述了通风空调安装工程在安装过程为了保证工程质量,如何建立健全质量保证体系,制订了一系列有效的质量控制措施,并在施工过程中严格执行,从而有效地保证工程的质量。 相似文献
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A320系列飞机是AIRBUS公司研发的单通道电传操控民用客机,它是世界上第一种采用电传操纵及侧杆驾驶的民用客机。该飞机的电子设备舱存放大量与飞行相关的控制计算机,当飞机在飞行过程中各计算机会产生大量的热量,严重影响航空运行安全。本文深入研究电子舱通风的工作原理,并总结分析航线维护过程中电子舱通风系统故障产生原因与排故思路。 相似文献
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The aim of this study was to devise a laboratory-based protocol for a motorized treadmill that was representative of work rates observed during soccer match-play. Selected physiological responses to this soccer-specific intermittent exercise protocol were then compared with steady-rate exercise performed at the same average speed. Seven male university soccer players (mean - s : age 24 - 2 years, height 1.78 - 0.1 m, mass 72.2 - 5.0 kg, VO 2max 57.8 - 4 ml·kg -1 ·min -1 ) completed a 45-min soccer-specific intermittent exercise protocol on a motorized treadmill. They also completed a continuous steady-rate exercise session for an identical period at the same average speed. The physiological responses to the laboratory-based soccer-specific protocol were similar to values previously observed for soccer match-play (oxygen consumption approximately 68% of maximum, heart rate 168 - 10 beats·min -1 ). No significant differences were observed in oxygen consumption, heart rate, rectal temperature or sweat production rate between the two conditions. Average minute ventilation was greater ( P ? 0.05) in intermittent exercise (81.3 - 0.2l·min -1 ) than steady-rate exercise (72.4 - 11.4l·min -1 ). The rating of perceived exertion for the session as a whole was 15 - 2 during soccer-specific intermittent exercise and 12 - 1 for continuous exercise ( P ? 0.05). The physiological strain associated with the laboratory-based soccer-specific intermittent protocol was similar to that associated with 45 min of soccer match-play, based on the variables measured, indicating the relevance of the simulation as a model of match-play work rates. Soccer-specific intermittent exercise did not increase the demands placed on the aerobic energy systems compared to continuous exercise performed at the same average speed, although the results indicate that anaerobic energy provision is more important during intermittent than during continuous exercise at the same average speed. 相似文献
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刘兵 《武汉工程职业技术学院学报》2011,23(1):77-78,80
针对供热通风与空调工程专业的实验实训教学需要,设计、自制了一套采暖实验装置。该实验装置最终可以构成散热器采暖、地板辐射采暖两大采暖系统,可用于本专业供热方面课程的实践教学,改善了实验实训教学条件,满足了专业教学的需要。 相似文献
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