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本文以S系列疏水剂为改性材料,硫氧镁水泥为胶凝材料,细集料、锯木屑为填充材料,制备改性硫氧镁水泥混凝土,研究疏水剂种类及掺量对水泥混凝土性能的影响。结果表明,随着疏水剂掺量的增加,试件养护峰值温度不断降低,出现温度峰值的时间不断延长。S1疏水剂的引气和稳定气泡作用导致试件密度降低,力学性能下降;S2疏水剂具有消泡功能,随掺量的增加,试件密度略有提高,力学强度有大幅度提高;S3疏水剂既不会引气也不会消泡,对试件密度没有明显影响。质量分数为氧化镁质量的1.5%时,3种疏水剂均能大幅度提高试件的抗压强度和耐水性,其中S2疏水剂的效果最佳。 相似文献
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《Planning》2013,(3)
目的观察骨刺消巴布剂治疗膝关节骨性关节炎的临床疗效。方法将符合中医及西医诊断标准的膝关节骨性关节炎患者63例随机分成2组。治疗组32例给予骨刺消巴布剂外敷,每次1贴,隔日更换1次;对照组31例给予奇正消痛贴膏外敷,每次1贴,隔日更换1次。4周后比较2组疗效。结果治疗后2组关节疼痛、行走距离、膝关节活动度积分均较治疗前显著降低,差异有统计意义(P<0.05);治疗后治疗组各项积分显著低于对照组,差异有统计意义(P<0.05)。治疗组总有效率为90.6%,对照组为74.2%,2组比较差异有统计意义(P<0.05)。结论骨刺消巴布剂外敷治疗膝关节骨性关节炎疗效显著。 相似文献
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在综述氯气的理化性质和毒理作用的基础上 ,分析了氯气生产工艺及其注意事项 ,并对氯气生产、储存、运输过程中的爆炸危险性进行了探讨 ,着重研究了三种爆炸情况。简介了氯气泄漏的应急处理和探讨了氯气泄漏爆炸事故中的人为原因 相似文献
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为解决机制砂混凝土和易性差、易泌水离析等问题,通过筛选聚羧酸减水剂母液和保坍剂,并复配适量的消泡、引气和缓凝组分,开发出一种机制砂混凝土专用外加剂。结果表明,采用MS-3聚羧酸减水剂母液与BT-3保坍剂复配,并掺加少量的消泡剂X1、引气剂Y1和缓凝剂H1,可赋予机制砂混凝土优异的流动性、保坍性和力学性能。制备的机制砂混凝土成功用于高层楼板,获得良好的技术及经济效果。 相似文献
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本文针对静电对建筑塑料制品的危害,讨论了静电的产生及其消除途径,重点论述了静电消除技术,即抗静电剂的消电机理、选择方法以及建筑塑料制品如何具体使用抗静电剂。 相似文献
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《Planning》2016,(2)
目的:观察消痔坐浴剂在痔疮患者术后的应用效果。方法:选取痔疮术后患者80例作为观察对象,按疗法不同将其分为对照组、观察组各40例。对照组患者给予马应龙痔疮膏疗法,研究组给予消痔坐浴剂疗法,观察比较两组临床效果。结果:研究组缓解率95.0%,高于对照组的77.5%,差异具有统计学意义(P<0.05);研究组患者临床指标(疼痛、水肿、创面渗出物消退时间、伤口愈合时间)与对照组相比,差异具有统计学意义(P<0.05)。结论:痔疮患者术后行消痔坐浴剂疗法,消肿、止痛效果明显,可缩短伤口愈合时间,值得推广应用。 相似文献
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This paper aimed to investigate the impact of two coating methods, namely solid adsorbent (CaCl2) finishing and liquid absorbent (LiCl) filming, on energy (enthalpy) exchange efficiency of a cellulose fibre air-to-air heat & mass exchanger, through both theoretical analyses and experimental testing. Heat and mass transfer through three types of membrane, i.e., clear fibre and the fibre with adsorbent finishing and absorbent filming, were analysed. This led to the conclusion that the coating on the membrane would help improve energy exchange efficiency of the exchanger. Experimental testing was carried out for the exchangers with the two coatings, and the testing results were compared with the existing data of a clear fibre exchanger. It was found that absorbent (LiCl) filming had larger impact towards the energy exchange than the solid CaCl2 powder did, and the level of efficiency increase for the two coatings are 25.6% and 15.9%, respectively. However, the inherent problems existing in liquid absorbent system, i.e., complexity of the desiccant cycle and potential air contamination by desiccant solution, limited its wide application in practical engineering, and therefore, the adsorbent finishing is a suitable option for this purpose. 相似文献
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稳定性二氧化氯 ( Cl O2 )是一安全高效的消毒剂 ,介绍了稳定性二氧化氯的性质、制备工艺 (包括制备工艺的技术关键 )以及应用领域 相似文献
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原水氨氮较高期间氯耗高的原因及对策 总被引:1,自引:0,他引:1
汕头市月浦水厂近年来在3月-5月间常出现持续10多天的原水氨氮浓度较高的现象,此间氯耗显著增高.针对这一问题,从水体及制水构筑物的耗氯情况、加氯方式以及余氯测定方法造成的影响三个方面进行了分析,建议原水氨氮浓度较高期间采取定期向各构筑物内投加适量次氯酸钙(漂粉精),对出厂水余氯以总氯控制代替游离氯控制,统一使用DPD法测定余氯等措施加以解决. 相似文献
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Electrochemical process combined with UV light irradiation for synergistic degradation of ammonia in chloride-containing solutions 总被引:1,自引:0,他引:1
An electrochemical process combined with ultraviolet light irradiation (UPE) using nonphotoactive dimensionally stable anodes (DSAs) like RuO2/Ti and IrO2/Ti in the presence of chlorides was investigated for ammonia degradation. In this process, the in situ electrogenerated active chlorine and in situ photogenerated chlorine radicals were responsible for the high efficiency of ammonia degradation. More than 97% of ammonia was converted to nitrogen and a significantly synergistic effect was confirmed. Compared with the single electrochemical (E) and photochemical (P) process, the degradation rates of ammonia and the average current efficiencies (ACEs) of the UPE process increased by 1.5 and 1.7 times using RuO2/Ti and IrO2/Ti electrodes, respectively. On the basis of the linear voltammograms, Electrochemical Impedance Spectra (EIS), UV-vis spectra, Electron Spin Resonance (ESR) analysis and a series of experiments designed, the synergistic mechanism was investigated. In addition, this unique process succeeded in transferring the reaction from the electrode surface to the bulk of the solution compared with the conventional photoelectrocatalytic (PEC) process. The loss of chloride decreased from 21.0% to 7.2% and the recycle of chloride was accelerated in the UPE process. Finally the effects of initial pH, current density and ammonia-nitrogen concentration were discussed. Results indicated that pH and ammonia concentration exerted little influences on the degradation rates and current density was the “rate-determining” factor. 相似文献