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本文以聚苯乙烯磺酸钠为湿敏材料制备了高分子电阻型湿度传感器,研究了其在高温高湿环境下,施加交流电激励后的老化行为。考察了通电电压、通电时间等对传感器响应特性的影响,并对其老化机理进行了探讨。提出通电老化后,湿敏材料在不同湿度下的电阻变化决定于高温高湿环境造成的溶解效应和施加电压后引起的通道效应和离子破坏效应。研究表明,在较高湿度环境下(87~93%RH),施加800mv的电压可加速湿敏材料的老化过程,使湿度传感器响应信号较快达到稳定,从而有望改善湿度传感器的稳定性。 相似文献
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热害矿井降温技术研究及应用 总被引:1,自引:0,他引:1
分析了矿井热湿源分布、高温高湿热害对矿井安全生产的影响及非人工制冷降温的主要措施及特点,阐述了矿井空调降温的主要类型及基本原理。结合周源山煤矿深部热害治理工程实践,基于周源山煤矿通风系统现状及含有丰富的涌水冷源这一天然优势,制定了提取矿井涌水冷源的HEMS矿井空调降温方案。在深部开采过程中,从矿井涌水中提取冷量,将冷量传输至深部工作面,与高温高湿空气进行热湿交换,从而降低工作面温度、湿度,改善作业环境。 相似文献
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表调对汽车涂装磷化成膜的影响 总被引:2,自引:0,他引:2
大型汽车涂装生产线上的通道温度可达40~50℃,湿度达90%~95%,磷化膜在这种高温高湿环境中极易发黄发花.介绍了胶体钛盐表调的成分及作用机理,分析了钛盐表调对磷化成膜发黄发花的影响,通过对表调使用工艺的改进,可提高生产过程中磷化膜质量. 相似文献
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一、前言机械及机械零件、汽车零件等金属制品的长期保管或海上运输时,防锈期虽然预计为1~6个月,可是在出口时通过海上运输,向热带、亚热带等高温、高湿的国家出口较多,与在国内长期封存时相比,温度、湿度 相似文献
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热镀锌钢材在海洋大气环境中的氢渗透行为 总被引:1,自引:0,他引:1
用改进的Devanathan双面电解池在恒温、恒湿)条件下检测热镀锌钢材的渗氢电流密度并观测其腐蚀形貌,研究了温度对其氢渗透行为的影响.结果表明,在湿度相同的条件下,随着模拟海洋大气环境温度的升高试样的氢渗透加速,且湿度越高温度的这种加速作用越显著;在高温和高湿条件下,试样的氢吸收和氢渗透进行得更快. 相似文献
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高速列车内室照明舒适性设计研究 总被引:1,自引:1,他引:0
从广义的舒适性角度探讨高速列车内室照明设计,分析了照明与视觉特性的关系及影响视觉舒适性的因素,就色温、照度、照射方式和照明的空间布置对心理舒适性的影响进行了详细的论述,并从环境照明、局部照明、装饰照明3个方面总结了高速列车内室照明舒适性设计策略。 相似文献
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目的 随着中国城市人口数量的逐渐增加,在人口密度高的地区,大量居民住在排布密集的高层楼房、老旧楼房、地下室和半地下室中.高层住宅排布密集导致房屋相互遮挡、老旧楼房存在设计缺陷、地下室或半地下室没有采光窗口.诸多因素导致居住环境存在一个问题:室内自然采光差.基于此通过设计法试图设计一款可以改善室内自然光环境的产品,应用物理方法提高室内光环境质量,美化室内视觉环境.方法 通过对城市居民进行问卷调研和走访调研,结合图表分析现状及问题成因,明确用户痛点;建立KANO模型分析用户需求.根据用户需求设计产品,并通过DIALux光学模拟验证产品可行性.结论 设计了一款可以改善居室弱采光环境的产品:产品悬挂于室内墙壁,通过增强光线在室内的照射面积提高照度,达到改善弱采光环境的目的. 相似文献
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通过间接估算和试验两种途径对连铸10CrNiCu钢板的焊接预热温度进行了研究,研究结果表明连铸10CrNiCu钢具有较好的焊接抗裂性,一般情况下焊接不需要预热,但是在低温高湿度、碳当量较高和结构拘束度大的情况下焊接时需要预热到60℃以上。 相似文献
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Picard M Girard SA Simard M Larocque R Leroux T Turcotte F 《Accident; analysis and prevention》2008,40(5):1644-1652
This retrospective study explores the association between occupational noise exposure at the time of hearing tests, permanent noise-induced hearing loss and work-related accident risk. Log-binomial analysis was used to first ascertain the association between study variables according to activity sector (North American Industry Classification System, NAICS) and accident context while controlling for age. Second part of the paper estimates the overall number of accidents attributable to occupational noise or the associated hearing loss (excess fraction). Study was carried on a sample of 52,982 male workers exposed to a minimum of 80dBA on a daily basis and whose hearing was examined at least once between 1983 and 1996 by public health authorities of Quebec. These participants evidenced bilateral average hearing threshold levels at 3, 4 and 6kHz ranging from normal (=15dB) to hearing loss in excess of 50dB as a result of chronic occupational noise exposure (subjects otherwise otologically normal). The occupational accident count of these workers was derived from the individual histories registered with the Quebec workers' compensation board for the 1983-1998 period. Results show an association between accident risk and worker's hearing sensitivity. For example, a hearing loss of 20dB corresponds to a rise of accident risk equal to 1.14 when controlling for age and occupational noise exposure at the time of hearing tests. NAICS economic activity sectors where association is the most noticeable are "Metal Transformation", "Metal Product Manufacturing" and "Transportation Equipment Manufacturing". "Passive accidents" (PR per decibel of hearing loss=1.008; CI 95 (1.007; 1.010)) and "same-level falls" (1.007; CI 95 (1.003; 1.010)) are the two accidents categories most strongly associated with hearing loss. Overall, 12.2% of accidents considered in this study were attributable to a combination of noise exposure in the workplace (>/=90dBA) and noise-induced hearing loss. 相似文献
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介绍了适合混凝土结构局部压应力、 压应变状态监测的嵌入式炭纤维水泥石压敏传感器的概念及其传感原理, 并研究了环境温度和湿度两个因素对炭纤维水泥石压敏传感器零点输出的影响; 同时从传感器电路设计角度探讨了温度、 湿度的补偿方法及其在结构中的应用方式。研究表明: 炭纤维水泥石压敏传感器的零点输出对环境温度、 湿度的变化比较敏感, 温度、 湿度的最大影响分别约为6%和200%; 对炭纤维水泥石压敏传感器采用"测试-补偿"对耦设置构成的补偿电路可以消除因环境温度、 湿度以及极化作用产生的噪声信号对传感器零点输出的影响。 相似文献
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A novel adaptive forward linear prediction (FLP) denoising algorithm and a temperature drift modeling and compensation concept based on ambient temperature change rate for fiber-optic gyroscope (FOG) are presented to calibrate the errors caused by intense ambient temperature variation. The intense ambient temperature variation will bring large temperature errors, which will degrade the performance of FOG. To analyze the temperature variation, characteristics of FOG temperature experiments are developed at first. Then the adaptive FLP denoising algorithm is employed to eliminate the noise aiming at reducing noise interference. After that, a simple modeling concept of building the compensation model between temperature drift and ambient temperature change rate is first to be given (we have not found a report of better results in any literature). The semiphysical simulation results show that the proposed method significantly reduces the noise and drift caused by intense ambient temperature variation. 相似文献
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目的面向智能产品状态信息的视觉性表达,探讨提取、匹配与重组智能产品光效视觉特征的设计方法。方法以空气净化器的光效设计为例,根据产品符号学和认知心理学理论,基于视觉特征,运用限定式KJ法建立智能产品光效特征的要素清单,运用问卷与量表建立光效闪烁样式、闪烁频率与灯光亮度3个特征与智能产品状态信息相匹配的设计模型,最后通过匹配实验证明本方法在智能产品光效设计中的有效性。结果设计出针对空气净化器运行活跃、夜间睡眠、通知换芯和程序故障4种状态的光效。结论通过将智能产品光效视觉特征进行提取、匹配与重组,增强光效对智能产品状态信息的准确性表达。与此同时,将光效作为用户与产品沟通的媒介,以提升用户对智能产品状态的认知,并引导用户对智能产品作出相应的操作反馈。 相似文献
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Reliability of low power electrical contacts such as those in hearing aid battery-spring systems is a very critical aspect for the overall performance of the device. These systems are exposed to certain harsh environments like high humidity and elevated temperatures, and often in combination with high levels of salt from human perspiration and environmental pollutants. In addition, the design aspects of such systems often call for multi-material combinations of substrate and coatings for catering to various requirements such as electrical conductivity and wear resistance, which in turn enhance the susceptibility of these systems to galvanic corrosion. In this study, traditional behind-the-ear (BTE) hearing aid systems, which failed during service were analysed. Failure analysis was performed on the dome type battery-spring contact systems. The morphology of the contact areas was observed using scanning electron microscopy, and the compositional analysis of the corrosion products and contaminants was performed using energy dispersive X-ray spectroscopy. Wear track morphology was observed on the contact points, and the top coating on the dome was worn out exposing the substrate spring material. The obtained results were correlated to the underlying corrosion mechanism and the failure mode is presented. 相似文献
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环境温湿度的波动性对烟草实验室检测设备及测试结果的准确性有重要影响。本文对某烟草实验室温湿度波动度、空气流速、噪声等参数无法达标的原因进行分析,对实验室恒温恒湿机的送回风气流方式进行改进:由散流器送风改为孔板送风,并设计制作静压室,降低风速和噪声。改进后,实验室温度短时波动度由原来的2.5℃降为0.9℃,相对湿度短时波动度由原来的5.6%降为2.2%,空气流速由原来的0.8 m/s降为0.2 m/s,噪声由原来的65 dB(A)降为54 dB(A),达到标准要求。 相似文献
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基于蒸发冷却与机械制冷相结合的毛细管辐射空调系统的设计计算 总被引:1,自引:0,他引:1
针对中等湿度和高湿度地区的气候特点,提出一种新型的节能环保型空调系统—基于蒸发冷却与机械制冷相结合的毛细管辐射空调系统。该系统中,蒸发冷却与风冷热泵组合式冷热水机组夏季制取高温冷水供给毛细管辐射末端,承担室内显热负荷,冬季制取热水;蒸发冷却新风机组制取新风送到室内,承担室内潜热负荷和部分显热负荷。文中以西安为例,分析了其节能性和舒适性特点,并结合具体例子对空气处理过程进行了分析计算。 相似文献