The objective of this research is to prepare specially designed surface texture on hard steel surface by electrochemical micromachining (EM) and to incorporate electroless plated Ag/MoS2 solid lubricant coating into t...The objective of this research is to prepare specially designed surface texture on hard steel surface by electrochemical micromachining (EM) and to incorporate electroless plated Ag/MoS2 solid lubricant coating into the dimples of EM textured steel surface to effectively reduce friction and wear of steel-steel contacts. The friction and wear behavior of the Ag/MoS2 solid lubricant coating on EM textured steel surface was evaluated in relation to the size and spacing of the dimples thereon. The microstructure of as-plated Ag/MoS2 solid lubricant coating and the morphology and elemental composition of the worn coating surface and counterface steel surface were analyzed by means of optical microscopy, scanning electron microscopy, and energy dispersive spectrometry. It is found that electroless plated Ag/MoS2 coating is able to greatly reduce the friction and wear of the EM textured steel disc coupled with GCr15 steel ring, mainly because of the formation of solid self-lubricating layer on the EM textured steel surface and of transferred lubricating film on counterface steel surface. The diameter and spacing of the dimples are suggested as 500 μm for acquiring the best wear resistance of the hard steel discs after electrochemical micromachining treatment and electroless plating of Ag/MoS2 solid lubricating coating.展开更多
目的分析杂交式单操作孔胸腔镜肺叶切除治疗早期非小细胞肺癌的临床疗效。方法早期非小细胞肺癌病人100例,根据手术方法不同分为观察组和对照组,每组各50例,观察组采取单操作孔胸腔镜肺叶切除术,对照组采取三孔胸腔镜肺叶切除术。比较...目的分析杂交式单操作孔胸腔镜肺叶切除治疗早期非小细胞肺癌的临床疗效。方法早期非小细胞肺癌病人100例,根据手术方法不同分为观察组和对照组,每组各50例,观察组采取单操作孔胸腔镜肺叶切除术,对照组采取三孔胸腔镜肺叶切除术。比较两组病人手术资料、术后恢复情况及并发症发生率。结果所有病人顺利完成手术且术中未出现严重并发症。观察组手术时间及淋巴结清扫数目分别为(163.8±34.0)分钟和(12.5±1.9)个,对照组分别为(153.5±38.4)分钟和(12.3±1.6)个,两组比较差异无统计学意义(P>0.05),观察组术中出血量、切口长度、术后胸腔引流量、术后带管时间、术后住院时间及术后1天视觉模拟评分(visual analog scale,VAS)分别为(174.5±28.0)ml、(1.6±0.3)cm、(455.9±42.7)ml、(2.9±0.4)天、(9.6±1.2)天和(5.2±1.3)分,对照组分别为(225.7±30.0)ml、(4.2±0.6)cm、(620.6±67.3)ml、(3.5±0.5)天、(12.3±2.2)天和(6.5±1.7)分,两组比较差异均有统计学意义(P<0.05)。观察组术后并发症发生率为20.0%,对照组为40.0%,两组比较差异有统计学意义(P<0.05)。两组术后1年肿瘤复发率及生存率比较差异均无统计学意义(P>0.05)。结论对于局限于单个肺叶的早期非小细胞肺癌,杂交式单操作孔胸腔镜下肺叶切除术术中出血量少,术后恢复快,并发症发生率较低。展开更多
为了分析Φ244.48 mm×11.99 mm 140V HSM-2-HC特殊螺纹接头的性能,采用有限元分析和实物试验对其进行研究。结果表明,该特殊螺纹接头上扣后,台肩应力水平较高,密封面局部接触面的应力超过材料屈服值,但鼻端整体应力水平远低于材料...为了分析Φ244.48 mm×11.99 mm 140V HSM-2-HC特殊螺纹接头的性能,采用有限元分析和实物试验对其进行研究。结果表明,该特殊螺纹接头上扣后,台肩应力水平较高,密封面局部接触面的应力超过材料屈服值,但鼻端整体应力水平远低于材料屈服值,接头的整体应力水平分布较合理;上扣曲线特性较好,在ISO 13679:2002 CAL IV复合加载下,特殊螺纹接头密封面均保持较大接触压力和密封长度,密封指数值大于理论临界值,表明其具有良好的密封性能;通过全尺寸复合加载实物试验以及极限试验,验证了该接头满足ISO 13679:2002 CALⅣ应用等级评价标准,具有优异的密封性能,其拉伸效率、压缩效率、内压效率、外压效率均达到管体100%。展开更多
基金supported by the the National NaturalScience Foundation of China(No.51205001)Foundation for Young Talents in College of Anhui Province(No.2012SQRL083ZD)the Talent Innovation Fund of An-hui Polytechnic University(No.S05305)
文摘The objective of this research is to prepare specially designed surface texture on hard steel surface by electrochemical micromachining (EM) and to incorporate electroless plated Ag/MoS2 solid lubricant coating into the dimples of EM textured steel surface to effectively reduce friction and wear of steel-steel contacts. The friction and wear behavior of the Ag/MoS2 solid lubricant coating on EM textured steel surface was evaluated in relation to the size and spacing of the dimples thereon. The microstructure of as-plated Ag/MoS2 solid lubricant coating and the morphology and elemental composition of the worn coating surface and counterface steel surface were analyzed by means of optical microscopy, scanning electron microscopy, and energy dispersive spectrometry. It is found that electroless plated Ag/MoS2 coating is able to greatly reduce the friction and wear of the EM textured steel disc coupled with GCr15 steel ring, mainly because of the formation of solid self-lubricating layer on the EM textured steel surface and of transferred lubricating film on counterface steel surface. The diameter and spacing of the dimples are suggested as 500 μm for acquiring the best wear resistance of the hard steel discs after electrochemical micromachining treatment and electroless plating of Ag/MoS2 solid lubricating coating.
文摘目的分析杂交式单操作孔胸腔镜肺叶切除治疗早期非小细胞肺癌的临床疗效。方法早期非小细胞肺癌病人100例,根据手术方法不同分为观察组和对照组,每组各50例,观察组采取单操作孔胸腔镜肺叶切除术,对照组采取三孔胸腔镜肺叶切除术。比较两组病人手术资料、术后恢复情况及并发症发生率。结果所有病人顺利完成手术且术中未出现严重并发症。观察组手术时间及淋巴结清扫数目分别为(163.8±34.0)分钟和(12.5±1.9)个,对照组分别为(153.5±38.4)分钟和(12.3±1.6)个,两组比较差异无统计学意义(P>0.05),观察组术中出血量、切口长度、术后胸腔引流量、术后带管时间、术后住院时间及术后1天视觉模拟评分(visual analog scale,VAS)分别为(174.5±28.0)ml、(1.6±0.3)cm、(455.9±42.7)ml、(2.9±0.4)天、(9.6±1.2)天和(5.2±1.3)分,对照组分别为(225.7±30.0)ml、(4.2±0.6)cm、(620.6±67.3)ml、(3.5±0.5)天、(12.3±2.2)天和(6.5±1.7)分,两组比较差异均有统计学意义(P<0.05)。观察组术后并发症发生率为20.0%,对照组为40.0%,两组比较差异有统计学意义(P<0.05)。两组术后1年肿瘤复发率及生存率比较差异均无统计学意义(P>0.05)。结论对于局限于单个肺叶的早期非小细胞肺癌,杂交式单操作孔胸腔镜下肺叶切除术术中出血量少,术后恢复快,并发症发生率较低。
文摘为了分析Φ244.48 mm×11.99 mm 140V HSM-2-HC特殊螺纹接头的性能,采用有限元分析和实物试验对其进行研究。结果表明,该特殊螺纹接头上扣后,台肩应力水平较高,密封面局部接触面的应力超过材料屈服值,但鼻端整体应力水平远低于材料屈服值,接头的整体应力水平分布较合理;上扣曲线特性较好,在ISO 13679:2002 CAL IV复合加载下,特殊螺纹接头密封面均保持较大接触压力和密封长度,密封指数值大于理论临界值,表明其具有良好的密封性能;通过全尺寸复合加载实物试验以及极限试验,验证了该接头满足ISO 13679:2002 CALⅣ应用等级评价标准,具有优异的密封性能,其拉伸效率、压缩效率、内压效率、外压效率均达到管体100%。
