In general, during the production of compacted graphite iron (CGI), the active residual magnesium reduces and the effect of inoculation fades after magnesium treatment. In this paper, characteristics of the thermal an...In general, during the production of compacted graphite iron (CGI), the active residual magnesium reduces and the effect of inoculation fades after magnesium treatment. In this paper, characteristics of the thermal analysis curve of CGI are compared with those of ductile iron and grey cast iron. The fading effect on the compacted graphite percentage and thermal analysis curve were also studied. Results indicate that the undercooling of CGI is as low as that of ductile iron, but CGI shows evident recalescence. In fading process, the magnesium element acts with oxygen. For a decrease in magnesium content, both the compacted graphite percentage and the austenitic liquidus temperature increase. The temperature of eutectic undercooling (TEU) decreases before the flake graphite appears. After that, TEU increases quickly, up to as high as 20℃, and then gradually decreases. The evolution of recalescence degree is opposite to that of TEU.展开更多
目的探讨腹腔镜肾盂切开取石术治疗复杂性肾结石的临床疗效。方法选择中国人民解放军联勤保障部队第九一〇医院于2021年1月至2022年1月收治的复杂性肾结石患者96例,按随机数字表法分为研究组和对照组,每组48例。研究组行腹腔镜肾盂切开...目的探讨腹腔镜肾盂切开取石术治疗复杂性肾结石的临床疗效。方法选择中国人民解放军联勤保障部队第九一〇医院于2021年1月至2022年1月收治的复杂性肾结石患者96例,按随机数字表法分为研究组和对照组,每组48例。研究组行腹腔镜肾盂切开术,对照组行开放性肾切开取石术。观察并比较两组患者围术期指标、一次性结石清除及术后并发症情况、术前和术后3 d应激炎性反应指标[皮质醇(Cor)、IL-6、CRP]和肾功能[肌酐(Cr)、尿素氮(BUN)]变化。结果研究组患者术中出血量少于对照组,下床活动时间、手术时间和术后住院时间均短于对照组(均P<0.05)。两组患者一次性结石清除情况比较差异无统计学意义(P>0.05)。研究组术后并发症发生率低于对照组(P<0.05)。两组患者术后3 d血清Cor、IL-6和CRP水平均较术前升高(均P<0.05),但研究组均低于对照组(均P<0.05)。两组患者术后3 d Cr和BUN水平均较术前升高(均P<0.05),但研究组均低于对照组(均P<0.05)。结论腹腔镜肾盂切开取石术治疗复杂性肾结石效果明显,术后并发症发生率低,且对患者的应激炎性反应和肾功能影响小。展开更多
文摘In general, during the production of compacted graphite iron (CGI), the active residual magnesium reduces and the effect of inoculation fades after magnesium treatment. In this paper, characteristics of the thermal analysis curve of CGI are compared with those of ductile iron and grey cast iron. The fading effect on the compacted graphite percentage and thermal analysis curve were also studied. Results indicate that the undercooling of CGI is as low as that of ductile iron, but CGI shows evident recalescence. In fading process, the magnesium element acts with oxygen. For a decrease in magnesium content, both the compacted graphite percentage and the austenitic liquidus temperature increase. The temperature of eutectic undercooling (TEU) decreases before the flake graphite appears. After that, TEU increases quickly, up to as high as 20℃, and then gradually decreases. The evolution of recalescence degree is opposite to that of TEU.
文摘目的探讨腹腔镜肾盂切开取石术治疗复杂性肾结石的临床疗效。方法选择中国人民解放军联勤保障部队第九一〇医院于2021年1月至2022年1月收治的复杂性肾结石患者96例,按随机数字表法分为研究组和对照组,每组48例。研究组行腹腔镜肾盂切开术,对照组行开放性肾切开取石术。观察并比较两组患者围术期指标、一次性结石清除及术后并发症情况、术前和术后3 d应激炎性反应指标[皮质醇(Cor)、IL-6、CRP]和肾功能[肌酐(Cr)、尿素氮(BUN)]变化。结果研究组患者术中出血量少于对照组,下床活动时间、手术时间和术后住院时间均短于对照组(均P<0.05)。两组患者一次性结石清除情况比较差异无统计学意义(P>0.05)。研究组术后并发症发生率低于对照组(P<0.05)。两组患者术后3 d血清Cor、IL-6和CRP水平均较术前升高(均P<0.05),但研究组均低于对照组(均P<0.05)。两组患者术后3 d Cr和BUN水平均较术前升高(均P<0.05),但研究组均低于对照组(均P<0.05)。结论腹腔镜肾盂切开取石术治疗复杂性肾结石效果明显,术后并发症发生率低,且对患者的应激炎性反应和肾功能影响小。
