Inconel 718 superalloy has extensive applications in a variety of industries such as the moulding,aerospace and medical due to its excellent mechanical features such as poor thermal conductivity,high strength at high ...Inconel 718 superalloy has extensive applications in a variety of industries such as the moulding,aerospace and medical due to its excellent mechanical features such as poor thermal conductivity,high strength at high temperatures and corrosion resistance.However,it is very difficult to process by traditional machining and finishing methods.Abrasive based finishing process is one of non-traditional finishing method applied to complex surfaces.Shot peening process is one of the surface treatment processes mostly applied to improve the surface strength.The superior advantages of these two processes are combined into one process.This newly developed and patented process is called as GOV process.In this study,the effects of GOV process parameters(number of cycles,steel ball size,media concentration)on the surface quality of Inconel 718 already pre-processed by wire electric discharge machining are investigated.The performance parameters are identified as surface roughness,material removal and white layer thickness.Surface finishing with the GOV process improves the surface roughness,Ra value by decreasing from 2.63μm to 0.46μm by removing micro-level chips up to 10.7 mg which is supported by SEM images.White layer formed due to nature of EDM process is completely removed from specimen surface.展开更多
目的探讨内镜下组织胶“三明治”联合钛夹治疗2型胃底静脉曲张(gastroesophageal varices type 2,GOV2)的应用价值。方法收集于2017年9月—2019年8月间在荔浦市人民医院住院治疗的60例GOV2型胃底静脉曲张患者作为研究对象,根据患者及家...目的探讨内镜下组织胶“三明治”联合钛夹治疗2型胃底静脉曲张(gastroesophageal varices type 2,GOV2)的应用价值。方法收集于2017年9月—2019年8月间在荔浦市人民医院住院治疗的60例GOV2型胃底静脉曲张患者作为研究对象,根据患者及家属意愿选择治疗方案,并按照治疗方案分为对照组和观察组,每组各30例。其中对照组接受组织胶+聚桂醇“三明治”夹心疗法,观察组接受“三明治”联合钛夹治疗。评估并比较患者近远期的临床疗效,并对比整个随访期间的并发症发生情况。结果所有患者均顺利完成手术,未出现术中不良反应。与对照组相比,观察组患者组织胶用量明显降低(P<0.05)。观察组的近期治疗总有效率为93.33%,明显高于对照组的82.76%(P<0.05)。治疗后6个月随访,所有钛夹均自行脱落。12个月随访时,观察组的远期治疗总有效率为94.00%,明显高于对照组的83.00%(P<0.05)。在整个随访期间,两组患者均未出现术中大出血、异位栓塞、排胶后深溃疡等严重并发症。观察组与对照组腹部不适、发热、腹腔感染等并发症的发生率无明显差异(P>0.05),但再出血的发生率明显降低(P<0.05)。结论内镜下组织胶“三明治”联合钛夹治疗GOV2型胃底静脉曲张能够在一定程度上提高治疗有效率,促进静脉曲张的消除,并且不增加手术风险,也可降低术后并发症发生率。展开更多
The Pearl River(Zhujiang)Delta(PRD)has been a focal point in reform era ac ademic circles not only for its dramatic industrial growth but a lso the simultaneous agricultural development.Unlike most of existing researc...The Pearl River(Zhujiang)Delta(PRD)has been a focal point in reform era ac ademic circles not only for its dramatic industrial growth but a lso the simultaneous agricultural development.Unlike most of existing research on the PRDeconomic development and transformation fromthe whole region level,this paper explored this question f romthe perspec-tive of a township using Beijiao in Shunde City as a case study.Unlike the c onclusions of existing studies whic h attribute the regional economic transition to the macro factors,particularly the influence of external investment,t his research re-veals that at the level of township,t he local government,the town-villa ge owned enterprises and the individ uals have been playing remarkable roles in local economic transformation.In the early stage since the economic reform,Beijiao township government,replacing the central a nd provincial governments before,b egan to manipulate the development o f town-village owned enterprises and lead the local economic transformation from agricultural to industrial dominated.As the town-village owned enterprises grew during the later years,they gra dually acted as the main dominant pla yer leading the local agricultural and industrial growth.At the same time the individuals in Beijiao were playing more in dependent role to gain their most profits.While the local government changed to be t he real manager of local economies.S o the local economic transition was not entirely externally driven.In another word,the“driven from outsidemodel can not totally explain the economic fact in this specific region.展开更多
文摘Inconel 718 superalloy has extensive applications in a variety of industries such as the moulding,aerospace and medical due to its excellent mechanical features such as poor thermal conductivity,high strength at high temperatures and corrosion resistance.However,it is very difficult to process by traditional machining and finishing methods.Abrasive based finishing process is one of non-traditional finishing method applied to complex surfaces.Shot peening process is one of the surface treatment processes mostly applied to improve the surface strength.The superior advantages of these two processes are combined into one process.This newly developed and patented process is called as GOV process.In this study,the effects of GOV process parameters(number of cycles,steel ball size,media concentration)on the surface quality of Inconel 718 already pre-processed by wire electric discharge machining are investigated.The performance parameters are identified as surface roughness,material removal and white layer thickness.Surface finishing with the GOV process improves the surface roughness,Ra value by decreasing from 2.63μm to 0.46μm by removing micro-level chips up to 10.7 mg which is supported by SEM images.White layer formed due to nature of EDM process is completely removed from specimen surface.
文摘目的探讨内镜下组织胶“三明治”联合钛夹治疗2型胃底静脉曲张(gastroesophageal varices type 2,GOV2)的应用价值。方法收集于2017年9月—2019年8月间在荔浦市人民医院住院治疗的60例GOV2型胃底静脉曲张患者作为研究对象,根据患者及家属意愿选择治疗方案,并按照治疗方案分为对照组和观察组,每组各30例。其中对照组接受组织胶+聚桂醇“三明治”夹心疗法,观察组接受“三明治”联合钛夹治疗。评估并比较患者近远期的临床疗效,并对比整个随访期间的并发症发生情况。结果所有患者均顺利完成手术,未出现术中不良反应。与对照组相比,观察组患者组织胶用量明显降低(P<0.05)。观察组的近期治疗总有效率为93.33%,明显高于对照组的82.76%(P<0.05)。治疗后6个月随访,所有钛夹均自行脱落。12个月随访时,观察组的远期治疗总有效率为94.00%,明显高于对照组的83.00%(P<0.05)。在整个随访期间,两组患者均未出现术中大出血、异位栓塞、排胶后深溃疡等严重并发症。观察组与对照组腹部不适、发热、腹腔感染等并发症的发生率无明显差异(P>0.05),但再出血的发生率明显降低(P<0.05)。结论内镜下组织胶“三明治”联合钛夹治疗GOV2型胃底静脉曲张能够在一定程度上提高治疗有效率,促进静脉曲张的消除,并且不增加手术风险,也可降低术后并发症发生率。
文摘The Pearl River(Zhujiang)Delta(PRD)has been a focal point in reform era ac ademic circles not only for its dramatic industrial growth but a lso the simultaneous agricultural development.Unlike most of existing research on the PRDeconomic development and transformation fromthe whole region level,this paper explored this question f romthe perspec-tive of a township using Beijiao in Shunde City as a case study.Unlike the c onclusions of existing studies whic h attribute the regional economic transition to the macro factors,particularly the influence of external investment,t his research re-veals that at the level of township,t he local government,the town-villa ge owned enterprises and the individ uals have been playing remarkable roles in local economic transformation.In the early stage since the economic reform,Beijiao township government,replacing the central a nd provincial governments before,b egan to manipulate the development o f town-village owned enterprises and lead the local economic transformation from agricultural to industrial dominated.As the town-village owned enterprises grew during the later years,they gra dually acted as the main dominant pla yer leading the local agricultural and industrial growth.At the same time the individuals in Beijiao were playing more in dependent role to gain their most profits.While the local government changed to be t he real manager of local economies.S o the local economic transition was not entirely externally driven.In another word,the“driven from outsidemodel can not totally explain the economic fact in this specific region.
