Excellent weldability substantially contributes to the intrinsic quality of steels,while appropriate chemical composition plays a primary role in the essential weldability of steels.The poor weldability of ferritic st...Excellent weldability substantially contributes to the intrinsic quality of steels,while appropriate chemical composition plays a primary role in the essential weldability of steels.The poor weldability of ferritic stainless steels could be improved through modification with minor alloy elements while minimally increasing the cost.Therefore,studying the effect of minor alloy elements on the weldability of steels is of considerable importance.In this study,several steels of middle-chromium hyperpure ferritic stainless 00Cr21Ti with different Ni content(0.3%,0.5%,0.8%,and 1.0%)were developed,and their weldabilities of butt joint samples welded using the metal inert gas welding process,including the influence of welded joints on the microstructure,tensile performance,corrosion resistance,and fatigue property,were investigated.Results show that the steels with w(Ni)≥0.8%exhibit excellent mechanical properties compared with those with low-Ni content steels,further,their impact toughness at normal atmospheric temperature meets the industrial application standard and the fatigue property is similar to that of 304 austenitic stainless steel.Moreover,results show that the corrosion resistance of all the samples is almost at the same level.The results acquired in this study are supposed to be useful for the optimization of the chemical composition of stainless steels aiming to improve weldability.展开更多
In order to provide anatomical basis for transoral approach （TOA） in dealing with the ventro lesions of craniocervical junction, and the design and application of artificial atlanto-odontoid joint, microsurgical dis...In order to provide anatomical basis for transoral approach （TOA） in dealing with the ventro lesions of craniocervical junction, and the design and application of artificial atlanto-odontoid joint, microsurgical dissecting was performed on 8 fresh craniocervical specimens layer by layer through transoropharyngeal approach. The stratification of posterior pharyngeal wall, course of vertebral artery, adjacent relationship of atlas and axis and correlative anatomical parameters of replacement of artificial atlanto-odontoid joint were observed. Besides, 32 sets of atlanto-axial joint in adults＇ fresh bony specimens were measured with a digital caliper and a goniometer, including the width of bony window of anterior arch of atlas, the .width of bony window of axis vertebra, the distance between superior and inferior two atlas screw inserting points, the distance between two axis screw inserting points etc. It was found that the width of atlas and axis which could be exposed were 40.2±3.5 mm and 39.3±3.7 mm respectively. The width and height of posterior pharyngeal wall which could be exposed were 40.1±5.2 mm and 50.2±4.6 mm respectively. The distance between superior and inferior two atlas screw inserting points was 28.0±2.9 mm and 24.0±3.5 mm respectively, and the distance of bilateral axis screw inserting points was 18.0±1.2 mm. The operative exposure position through TOA ranged from inferior part of the clivus to the superior part of the C3 vertebral body. Posterior pharyngeal wall consisted of 5 layers and two interspaces： mucosa, submucosa, superficial muscular layer, anterior fascia of vertebrae, anterior muscular layer of vertebrae and posterior interspace of pharynx, anterior interspace of vertebrae. This study revealed that it had the advantages of short operative distance, good exposure and sufficient decompression in dealing with the ventro lesions from the upper cervical to the lower clivus through the TOA. The replacement of artificial atlanto-odontoid joint is suitable and feasible. The design of artificial atlanto-odontoid joint should be based on the above data.展开更多
The derangement of the atlantoaxial joint is one of main cervical sources of dizziness and headache, which were based on the observation on the anatomy of the upper cervical vertebrae, analysis of X-ray film of the at...The derangement of the atlantoaxial joint is one of main cervical sources of dizziness and headache, which were based on the observation on the anatomy of the upper cervical vertebrae, analysis of X-ray film of the atlantoaxial joint, and the manipulative treatment in 35 patients with cervical spondylosis. The clinical diagnosis of derangement consists of: dizziness, headache, prominence and tenderness on one side of the affected vertebra, deviation of the dens for 1 mm-4 mm on the open-mouth X-ray film, abnormal movement of the atlantoaxial joint on head-rotated open-mouth X-ray film. An accurate and delicate adjustment is the most effective treatment.展开更多
目的研究加速康复外科(enhanced recovery after surgery,ERAS)技术在小儿发育性髋关节脱位(developmental dislocation of the hip,DDH)围手术期的应用价值。方法选取2017年5月至2019年5月在河南省儿童医院行DDH矫形术的76例DDH患者作...目的研究加速康复外科(enhanced recovery after surgery,ERAS)技术在小儿发育性髋关节脱位(developmental dislocation of the hip,DDH)围手术期的应用价值。方法选取2017年5月至2019年5月在河南省儿童医院行DDH矫形术的76例DDH患者作为研究对象,依据电脑随机计数法,将其分为两组,即加速康复组(ERAS组)和传统方法治疗组(对照组),每组各38例。比较ERAS组和对照组的一般资料,并采用Wong Banker面部表情量表法(FPS-R)、镇痛评分(CRIES)和镇静评分(Ramsay)对术后6 h、12 h、24 h的镇痛质量进行评价。同时检测不同时间点的血浆肿瘤坏死因子-α(TNA-α)和白介素-6(IL-6),并统计分析治疗后不良反应的发生率。结果ERAS组不同时间点的FPS-R评分和CRIES评分均低于对照组(P<0.05),Ramsay评分均高于对照组(P<0.05);ERAS组各时间点血浆TNA-α和IL-6水平均较对照组低(P<0.05);在不良反应发生率方面,ERAS组和对照组分别为2.63%、15.78%(P<0.05)。结论加速康复外科技术在小儿发育性髋关节脱位围手术期应用,安全、有效、可行,可显著减少手术后炎性反应及相关并发症的发生。展开更多
文摘Excellent weldability substantially contributes to the intrinsic quality of steels,while appropriate chemical composition plays a primary role in the essential weldability of steels.The poor weldability of ferritic stainless steels could be improved through modification with minor alloy elements while minimally increasing the cost.Therefore,studying the effect of minor alloy elements on the weldability of steels is of considerable importance.In this study,several steels of middle-chromium hyperpure ferritic stainless 00Cr21Ti with different Ni content(0.3%,0.5%,0.8%,and 1.0%)were developed,and their weldabilities of butt joint samples welded using the metal inert gas welding process,including the influence of welded joints on the microstructure,tensile performance,corrosion resistance,and fatigue property,were investigated.Results show that the steels with w(Ni)≥0.8%exhibit excellent mechanical properties compared with those with low-Ni content steels,further,their impact toughness at normal atmospheric temperature meets the industrial application standard and the fatigue property is similar to that of 304 austenitic stainless steel.Moreover,results show that the corrosion resistance of all the samples is almost at the same level.The results acquired in this study are supposed to be useful for the optimization of the chemical composition of stainless steels aiming to improve weldability.
文摘In order to provide anatomical basis for transoral approach （TOA） in dealing with the ventro lesions of craniocervical junction, and the design and application of artificial atlanto-odontoid joint, microsurgical dissecting was performed on 8 fresh craniocervical specimens layer by layer through transoropharyngeal approach. The stratification of posterior pharyngeal wall, course of vertebral artery, adjacent relationship of atlas and axis and correlative anatomical parameters of replacement of artificial atlanto-odontoid joint were observed. Besides, 32 sets of atlanto-axial joint in adults＇ fresh bony specimens were measured with a digital caliper and a goniometer, including the width of bony window of anterior arch of atlas, the .width of bony window of axis vertebra, the distance between superior and inferior two atlas screw inserting points, the distance between two axis screw inserting points etc. It was found that the width of atlas and axis which could be exposed were 40.2±3.5 mm and 39.3±3.7 mm respectively. The width and height of posterior pharyngeal wall which could be exposed were 40.1±5.2 mm and 50.2±4.6 mm respectively. The distance between superior and inferior two atlas screw inserting points was 28.0±2.9 mm and 24.0±3.5 mm respectively, and the distance of bilateral axis screw inserting points was 18.0±1.2 mm. The operative exposure position through TOA ranged from inferior part of the clivus to the superior part of the C3 vertebral body. Posterior pharyngeal wall consisted of 5 layers and two interspaces： mucosa, submucosa, superficial muscular layer, anterior fascia of vertebrae, anterior muscular layer of vertebrae and posterior interspace of pharynx, anterior interspace of vertebrae. This study revealed that it had the advantages of short operative distance, good exposure and sufficient decompression in dealing with the ventro lesions from the upper cervical to the lower clivus through the TOA. The replacement of artificial atlanto-odontoid joint is suitable and feasible. The design of artificial atlanto-odontoid joint should be based on the above data.
文摘The derangement of the atlantoaxial joint is one of main cervical sources of dizziness and headache, which were based on the observation on the anatomy of the upper cervical vertebrae, analysis of X-ray film of the atlantoaxial joint, and the manipulative treatment in 35 patients with cervical spondylosis. The clinical diagnosis of derangement consists of: dizziness, headache, prominence and tenderness on one side of the affected vertebra, deviation of the dens for 1 mm-4 mm on the open-mouth X-ray film, abnormal movement of the atlantoaxial joint on head-rotated open-mouth X-ray film. An accurate and delicate adjustment is the most effective treatment.
文摘目的研究加速康复外科(enhanced recovery after surgery,ERAS)技术在小儿发育性髋关节脱位(developmental dislocation of the hip,DDH)围手术期的应用价值。方法选取2017年5月至2019年5月在河南省儿童医院行DDH矫形术的76例DDH患者作为研究对象,依据电脑随机计数法,将其分为两组,即加速康复组(ERAS组)和传统方法治疗组(对照组),每组各38例。比较ERAS组和对照组的一般资料,并采用Wong Banker面部表情量表法(FPS-R)、镇痛评分(CRIES)和镇静评分(Ramsay)对术后6 h、12 h、24 h的镇痛质量进行评价。同时检测不同时间点的血浆肿瘤坏死因子-α(TNA-α)和白介素-6(IL-6),并统计分析治疗后不良反应的发生率。结果ERAS组不同时间点的FPS-R评分和CRIES评分均低于对照组(P<0.05),Ramsay评分均高于对照组(P<0.05);ERAS组各时间点血浆TNA-α和IL-6水平均较对照组低(P<0.05);在不良反应发生率方面,ERAS组和对照组分别为2.63%、15.78%(P<0.05)。结论加速康复外科技术在小儿发育性髋关节脱位围手术期应用,安全、有效、可行,可显著减少手术后炎性反应及相关并发症的发生。
