简介:〔摘要〕从物理课堂教学语言的特点、运用技巧及表达等阐述了物理教师的教学语言在物理教学中的重要性,如何从教学实际出发,取得最佳效果。
简介:摘要目的比较负压胶圈套扎术(RPH)与内痔结扎切除术治疗内痔的疗效。方法回顾性分析我院肛肠科收治因患内痔而接受RPH或内痔结扎切除的61例住院患者的临床治疗,根据不同术式分为RPH组(n=35)和内痔结扎切除术组(n=26),对2组患者手术后的症状改善情况、手术时间、出血量、住院时间、治疗费用、并发症等进行比较。结果1.RPH组较内痔结扎切除术组疗效无明显差异,无统计学意义(P>0.05)。2.RPH较内痔结扎切除术手术时间短、术中出血量少、住院时间短,有统计学意义(P<0.05)。3.RPH较内痔结扎切除术组术后疼痛轻、排尿困难发生率低,有统计学意义(P<0.05)。4.PRH组较内痔结扎切除术组住院费用高(P<0.05)。结论RPH较内痔结扎切除术治疗内痔疗效相当,但手术时间短,痛苦小,术后并发症少,但治疗费用高。
简介:Nitrobenzene-containingindustrialwastewaterwasdegradedinthepresenceofozonecoupledwithH2O2byhighgravitytechnology.Theeffectofhighgravityfactor,H2O2concentration,pHvalue,liquidflow-rate,andreactiontimeontheefficiencyforremovalofnitrobenzenewasinvestigated.TheexperimentalresultsshowthatthehighgravitytechnologyenhancestheozoneutilizationefficiencywithO3/H2O2showingsynergisticeffect.ThedegradationefficiencyintermsoftheCODremovalrateandnitrobenzeneremovalratereached45.8%and50.4%,respectively,underthefollowingreactionconditions,viz.:ahighgravityfactorof66.54,apHvalueof9,aH2O2/O3molarratioof1:1,aliquidflowrateof140L/h,anozoneconcentrationof40mg/L,aH2O2multipledosingmodeof6mL/h,andareactiontimeof4h.Comparedwiththeperformanceofconventionalstirredaerationmixers,thehighgravitytechnologycouldincreasetheCODandnitrobenzeneremovalraterelatedwiththenitrobenzene-containingwastewaterby22.9%and23.3%,respectively.