恒温恒湿实验箱的制备

恒温恒湿实验箱广泛应用于生物、医药、化工、农作物等多个领域实验研究,根据实验目的不同,实验箱的设计各有侧重.口腔科的治疗操作均在口腔内进行,因此口腔材料尤其是充填与粘结材料常需在模拟口腔环境温度、湿度条件下进行操作以检测其性能.目前市面上的恒温恒湿实验箱在工作状态下箱门密闭,无法在箱内进行操作.笔者设计一款可进行箱内操作的简便、实用的恒温恒湿实验箱.     

BJ-4直线加速器因湿度过大造成故障的检修及防范

利用直线加速器进行放射治疗是目前治疗肿瘤病人的有效手段之一，近年来在各大、中型医院广泛应用。由于直线加速器是一种产生高能电离辐射的高压大功率装置，所以对环境要求较严格，因湿度大导致的故障时有发生，直接影响对病人的治疗。     

深圳市室内相对湿度变化情况的观察

国家对公共场所室内相对湿度的卫生标准订为30～80％,这个标准的上限值是否适合气候潮湿的城市,为此我们观察了深圳市室内相对湿度一年内的变化。1 方法 选择深圳市城区四层楼朝南的一个房间,面积     

湿热环境下Ⅱ度烫伤大鼠施行冷却疗法后体核温度的改变

OBJECTIVE: To observe the changes in rectal temperature (Tr) after immediate cooling therapy for Wistar rats with superficial second-degree scald burn in hot and humid environment, and evaluate the effect of the dressing material for cooling. METHODS: Twenty-four Wistar rats were randomly divided into 4 groups (n=6), namely normal temperature control (NTC), normal temperature cooling therapy (NTCT), hot and humid control (HHC), and hot and humid cooling therapy (HHCT) groups. Superficial second-degree scald burns were induced in the rats, followed by interventions with cooling therapy in the two therapy groups at dry bulb temperature (Tdb) of 35.33+/-0.35 degrees Celsius with relative humidity of 70.81%+/-1.38%, whereas the two control groups were treated at Tdb of 26.33+/-1.29 degrees Celsius with relative humidity of 71.05%+/-4.57% without dressing for cooling therapy. The exposure time of each group was 120 min, and the Tr was recorded every 20 min. RESULTS: On the basis of comparisons between the measurements taken at 7 different time points, we found that the Tr of the rats was elevated in hot and humid environment (P<0.001) and decreased when cooling therapy was applied (P<0.001). Interactions between the environmental temperature and cooling therapy were noted in their influence on Tr (P=0.003). As the exposure time was prolonged, Tr slowly decreased in NTC group, mildly fluctuated in NTCT group, but elevated in HHC and HHCT groups with gradual increase of the differences between the measurements taken at the same time point. CONCLUSION: Application of the dressing material on the abdomen for cooling therapy can efficiently lower the Tr, which may prevent the progression of the heat injury.     

影响紫外线照射强度诸因素中最佳工作状态的研究

影响紫外线照射强度的因素有电压、室温、湿度及反光罩。为使紫外线处于最佳照射强度工作状态，对影响紫外线照射强度诸因素的最佳工作状态进行了研究。结果表明，电压在２２０Ｖ以上时，照射强度较稳定，在５～２５℃范围内随温度的升高，灯管输出强度逐渐增强，湿度在５０％～６０％时，输出强度最大，表面光滑的铝制抛光反光罩使照射强度最佳     

人工鼻和气体流量设置对气道内吸入气温度和湿度的影响

目的：观察麻醉机呼吸环路气体低、中、高流量设置和呼吸环路加入人工界对气道内吸入气温度和湿度的影响。方法：选择60名ASA I～Ⅱ级病人，随机分为6组，3组呼吸环路内加入人工界，流量设置分别是0，5，1．5，4．5L/min；另3组不使用人工界，流量设置同上。应用温度湿度仪连续监测吸入气温度和相对湿度，公式计算绝对温度。机械通气3min后的测量值设为基础值，然后纪录15，30，45和60min的值。结果：随机械通气时间延长，人工鼻组的不同流量设置均显著增加气道内吸入气温度和湿度，当流量设置为0．5L/min最高，其次是1．5L/min，再其次为4．5L/min；不用人工鼻组，低、中、高流量设置显著影响气道内吸入气温度和湿度，随通气时间延长，流量为0．5L/min时温度和湿度逐渐升高，1．5L/min略有下降，4．5L/min则明显降低。结论：人工界能补偿气体中、高流量时气道内温度和湿度的降低，低流量增加气道内的温度和湿度。临床采用低流量麻醉技术和人工界对保护病人气道粘膜有利。     

润口液药理作用及刺激性的研究

润口液是一种用于解除生理性、病理性口干的制剂。实验研究结果表明，润口液具有促进唾液分泌，保持口腔湿润的功能，并且无毒、无刺激性。     

国内加温湿化吸氧装置的研究进展

综述国内有关吸氧温度、湿度及加温湿化吸氧装置的研究现状,提出研究湿化液温度与湿化氧气的温度、湿度时,要考虑到环境因素和实验设施的影响,未来的加温湿化吸氧装置,除应兼备吸氧温度和湿度的同时控制及单独控制外,还需要考虑标准化、批量化生产的需要.