目的探讨经尿道前列腺汽化电切术(transurethral electrovaporization of the prostate,TUVP)电切深度标识的可行性. 方法回顾性分析616例前列腺增生症临床资料,其中310例术前彩超提示合并前列腺钙化,156例合并膀胱结石,23例合并膀胱肿...目的探讨经尿道前列腺汽化电切术(transurethral electrovaporization of the prostate,TUVP)电切深度标识的可行性. 方法回顾性分析616例前列腺增生症临床资料,其中310例术前彩超提示合并前列腺钙化,156例合并膀胱结石,23例合并膀胱肿瘤.TUVP操作过程中,观察到合并前列腺结石和机械操作'打滑现象',停止电切. 结果全组手术时间30～120 min,平均75 min.术中验证术前彩超提示合并前列腺钙化的310例前列腺钙化为结石,同时发现其余306例均存在结石.1例术中膀胱穿孔,无尿道直肠瘘和尿道电切综合征发生.325例随访3～6个月,平均4.5月,最大尿流率由6.5～8.5 ml/s提高到18～22 ml/s,残余尿由70～150 ml降至0～10 ml,国际前列腺症状评分由19～24.5分降至0～7分.138例膀胱结石和23例膀胱肿瘤无复发. 结论前列腺结石和机械操作'打滑现象'作为TUVP的电切深度标识是切实可行的.展开更多
In this paper,the slip phenomenon(negative slip phenomenon) of coal-water mixture flowing in pipes is proved by the method of combining theoretical analyses with experimental investigations for the first time. On the ...In this paper,the slip phenomenon(negative slip phenomenon) of coal-water mixture flowing in pipes is proved by the method of combining theoretical analyses with experimental investigations for the first time. On the basis of analyzing the mechanism of slip flow phenomenon,a real rheological model of coal-water mixture is determined by correcting the influence of the slip.展开更多
The morphology evolution and phase transformation of Al9(Mn,Ni)2 eutectic phase in an Al-4Ni-2Mn alloy during heat treatment at 600°C were studied by scanning electron microscopy(SEM)and transmission electron mic...The morphology evolution and phase transformation of Al9(Mn,Ni)2 eutectic phase in an Al-4Ni-2Mn alloy during heat treatment at 600°C were studied by scanning electron microscopy(SEM)and transmission electron microscopy(TEM).Results show that nearly all of the eutectic fibers change into prolate ellipsoid and spherical particles in the process of heat treatment,and Ostwald ripening phenomenon occurs in the eutectic region with the increase of the heat treatment time.Besides,a phase transformation from Al9(Mn,Ni)2 to O-phase is confirmed.The morphologies of the transformed particles indicate that the O-phase preferentially nucleates on the specific crystal plane of the Al9(Mn,Ni)2 eutectic phase and grows in a certain direction.During the phase transformation,the(010)[001]slip system in O-phase is activated,and the resultant slip traces appear on the surface of some O-phase particles.展开更多
文摘In this paper,the slip phenomenon(negative slip phenomenon) of coal-water mixture flowing in pipes is proved by the method of combining theoretical analyses with experimental investigations for the first time. On the basis of analyzing the mechanism of slip flow phenomenon,a real rheological model of coal-water mixture is determined by correcting the influence of the slip.
文摘The morphology evolution and phase transformation of Al9(Mn,Ni)2 eutectic phase in an Al-4Ni-2Mn alloy during heat treatment at 600°C were studied by scanning electron microscopy(SEM)and transmission electron microscopy(TEM).Results show that nearly all of the eutectic fibers change into prolate ellipsoid and spherical particles in the process of heat treatment,and Ostwald ripening phenomenon occurs in the eutectic region with the increase of the heat treatment time.Besides,a phase transformation from Al9(Mn,Ni)2 to O-phase is confirmed.The morphologies of the transformed particles indicate that the O-phase preferentially nucleates on the specific crystal plane of the Al9(Mn,Ni)2 eutectic phase and grows in a certain direction.During the phase transformation,the(010)[001]slip system in O-phase is activated,and the resultant slip traces appear on the surface of some O-phase particles.
