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   

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   

从硫化铜矿制取硫酸铜工艺研究   总被引：1，自引：0，他引：1  

李入林  赵龙涛  石昌 《南阳师范学院学报》2002,1(2):72-74

硫化铜经粉碎，催化焙烧，浸取，铁屑置换制海绵铜，再制取符合GB473－93优等品的硫酸铜产品。  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   

次氯酸钠化学品的研究及应用     

郭士成  赵爱华 《临沂师范学院学报》2002,24(3):30-32

对次氯酸钠的制备、化学品性状、重要无机化学反应以及在水处理等方面的应用进行了综述。  相似文献   

粗十水碱半干法制备过碳酸钠的研究     

徐颖惠 《南平师专学报》2007,26(2):26-29,25

采用半干法新工艺,以粗十水碳酸钠为原料替代工业碳酸钠,制备得过碳酸钠产品,可充分利用十水碳酸钠的溶解热使反应物料温度很快从室温(25℃)降至低温(70C—8℃),实现节能降耗。经正交试验优化得适宜的制备工艺条件为每40克粗十水碳酸钠用30%H_2O_216ml,各0.2gEDTA 和 Na_2SiO_3复合使用为内稳定剂,各0.2g,MgSO_4和 Na_2HPO_4复合使用为外稳定剂,产品质量符合部颁合格标准,一次性产率迭89.5%。  相似文献   

石膏法生产硫酸钾的研究进展   总被引：1，自引：0，他引：1  

王拥军 《焦作大学学报》2005,19(1):89-91

简要介绍了石膏法生产硫酸钾在工艺路线、反应溶剂、理论研究方面的进展。  相似文献   

一水合硫酸氢钠催化合成乙酸正己酯   总被引：2，自引：2，他引：2  

朱蕾 《许昌学院学报》2003,22(2):47-48

研究了以硫酸氢钠为催化剂，乙酸和正己醇为原料合成乙酸正己酯，并考察了反应条件对酯化率的影响．结果表明，在适宜条件下其酯化率可达97．6％．  相似文献   

以酸洗废液生产聚合硫酸铁的工艺研究   总被引：1，自引：0，他引：1  

胡菊  马俊林  郭兴荣  夏永平 《十堰职业技术学院学报》2005,18(1):81-82

钢铁酸洗废液是一种常见的污染物,利用其生产聚合硫酸铁,可以实现废物的综合利用。论述了聚合硫酸铁的合成原理,探讨了用钢铁酸洗废液生产聚合硫酸铁的工艺流程,通过实验研究确定了生产工艺中适宜的温度、压力、反应时间、反应物组成和原料浓缩时蒸发器温度等条件。采用该工艺所得产品质量好、净水效率高。  相似文献