运动与补Na     

常燕  郑师超  邓晓岚 《武汉体育学院学报》2002,36(1):60-61

对运动员大量出汗导致体内总Na的亏空所引起的各种类型的热疾病分别进行了论述，强调了运动前和运动中补Na的重要性，并推荐了几种补Na的方法。  相似文献   

中国古代汞化物的制备方法     

马梅玉 《新疆教育学院学报》2004,20(2):119-121

中国古代汞化物的制备方法很多，本重点讨论与现代汞化物制备方法相似的硫化汞；氧化汞；氯化汞；氯化亚汞的制备方法及化学反应方程式。  相似文献   

氯化银沉淀提取金属银方法探讨   总被引：5，自引：0，他引：5  

郭红  张群 《玉溪师范学院学报》2002,18(3):75-76

利用碳酸盐与氯化银在高温下作用生成碳酸银 ,碳酸银分解得到金属银 ,从而提取回收含银废液中的金属银 .  相似文献   

Environmentally-induced stone decay: the cumulative effects of crystallization–hydration cycles on a Lincolnshire oopelsparite limestone     

Belinda J. Colston  David S. Watt  Helen L. Munro   《Journal of Cultural Heritage》2001,2(4)

An investigation has been undertaken at St Andrew’s church, Walpole St Andrew, Norfolk, to establish the underlying causes of the observed stone decay to the upper parts of the six stone piers. The stone decay was first recorded in the early 1930s. The salt-contaminated masonry within the church has been shown to undergo severe salt decay during the summer, with little damage occurring over the winter months. The south aisle piers have been shown to decay 2.5 times faster than the north aisle piers. Although crystallization–hydration cycles have been identified, the rate of decay is at its greatest when the cycling is relatively infrequent. This was not the expected trend. Furthermore, it has been shown that during extended periods where the ambient relative humidity is less than 75%, the rate of decay reaches a maximum. It is the length of this ‘drying’ period that apparently has the greatest influence on the rate of decay and could explain the significant difference in the rate of decay between the south and north aisle piers. The results have serious implications for passive conservation, where it is often recommended to lower the ambient relative humidity to well below the equilibrium relative humidity of the salt contaminant, to avoid crystallization–hydration cycles. Since, at the time of building, the church was situated on the coast, it is possible that the sodium chloride contamination occurred during the building process (1440–1520), particularly since the area was prone to sea-flooding at this time. Alternatively, the salt could have been applied as a treatment during the general restoration of 1897. Whatever the source of the salt, it seems likely that the ambient environment was changed by the insertion of a sealed floor in 1897, which could account for the onset of the salt decay.  相似文献   

N-甲基苯氨基-4,6-二甲氧基-1,3,5三嗪的合成与表征     

李宪平  肖深初  熊知行  梅光泉 《宜春学院学报》2006,28(6):19-21

目的:为了进一步研究与发展均三嗪衍生物的制备方法.方法:在丙酮介质中,三聚氯氰先后与N-甲基苯胺、甲醇反应,合成了N-甲基苯氨基-4,6-二甲氧基-1,3,5三嗪.结果:标题化合物经红外光谱和质谱对它进行了表征,筛选出了最佳的工艺条件.结论:制备方法简单,反应条件温和,效果良好.  相似文献   

无机洗涤助剂的进展     

贾静娴 《唐山师范学院学报》2002,24(5):30-31

介绍了国内外洗涤助剂的发展状况，传统洗涤助剂磷酸盐被限制，沸石类助剂有局限，层状硅酸钠以优良的洗涤性能，环保无污染的特点，成为洗涤工业的新宠。  相似文献   

用正交试验选择FA-Ⅱ氯酸钠电解槽最佳工艺条件     

郑建美  刘华 《福建师大福清分校学报》2004,(2):54-58

本文探讨了在FA-Ⅱ氯酸钠电解槽中,电解氯化钠溶液制备氯酸钠的适宜工艺条件.采用正交试验方法,考察了电流密度、电解液PH值、电解温度、氯化钠含量等对电解电耗的影响,确定了FA-Ⅱ电解槽最佳工艺条件.  相似文献   

黄土高原水保基本模式对福建水土流失治理思路的启示     

郭力宇 《咸阳师范学院学报》2005,20(6):40-44

黄土高原是我国水土流失严重的地区之一。在长期的防治过程中,以因地制宜、因害设防、除害兴利、为发展地方经济服务的原则,坚持工程措施、生物措施、农业措施相结合的综合治理思想,根据水土流失区的实际条件制定相应措施,在黄土高原地区总结了许多行之有效的基本治理模式,积累了许多成功的治理经验,其中主要包括五道防线基本治理模式、三道防线基本治理模式、小流域综合基本治理模式及县域水土流失基本治理模式。这些基本治理模式和成功经验对福建及我国其它地区水土流失防治有着重要的帮助及借鉴作用。  相似文献   

SnCl_2溶液的配制及反常现象的探讨     

陈美珠 《闽江学院学报》1996,(1)

本文探讨了S_nCl_2溶液的配制方法和配制过程中所出现的问题及S_nCl_2溶液性质的一些反常现象。  相似文献   

海水冻融和侵蚀耦合作用下混凝土破坏面演化模型     

张峰  李树忱  叶见曙  李守凯 《东南大学学报》2011,(2):206-209

为了有效评估海水冻融与侵蚀后混凝土的力学性能,基于大型静态和动态刚度伺服压力机进行了混凝土冻融和海水侵蚀后的力学性能试验.对混凝土进行了50,100,200和300次冻融循环,并配置了人工海水;选择了合理的干湿循环机制,对冻融后的混凝土试块进行了10,20,30,40,50和60次干湿循环.对混凝土弹性模量和抗压强度退...  相似文献