The effect of graphite surface modification on the thermal conductivity(TC) and bending strength of graphite flakes/Al composites(Gf/Al) prepared by gas pressure infiltration were investigated. Al3 Ni and Al4C3 phase ...The effect of graphite surface modification on the thermal conductivity(TC) and bending strength of graphite flakes/Al composites(Gf/Al) prepared by gas pressure infiltration were investigated. Al3 Ni and Al4C3 phase may form at the interface in Ni-coated Gf/Al and uncoated Gf/Al composites, respectively, while the Al-Cu compound cannot be observed in Cu-coated Gf/Al composites. The Cu and Ni coatings enhance TC and the bending strength of the composites in the meantime. TC of Cu-coated Gf/Al composites reach 515 Wm^-1·K^-1 with 75 vol% Gf, which are higher than that of Ni-coated Gf/Al. Meanwhile, due to Al3 Ni at the interface, the bending strength of Ni-coated Gf/Al composites are far more than those of the uncoated and Cu-coated Gf/Al with the same content of Gf. The results indicate that metal-coated Gf can effectively improve the interfacial bonding between Gf and Al.展开更多
目的分析儿童腹腔镜胆总管囊肿根治术后并发症的发生情况,并探讨其危险因素。方法2015年8月至2023年6月广州医科大学附属妇女儿童医疗中心胃肠外科六病区共收治胆总管囊肿患儿498例,根据纳入标准对其中464例进行回顾性分析,将其中出现...目的分析儿童腹腔镜胆总管囊肿根治术后并发症的发生情况,并探讨其危险因素。方法2015年8月至2023年6月广州医科大学附属妇女儿童医疗中心胃肠外科六病区共收治胆总管囊肿患儿498例,根据纳入标准对其中464例进行回顾性分析,将其中出现术后并发症的39例患儿作为并发症组,未发生并发症的425例患儿作为无并发症组。采用单因素分析术后并发症发生的影响因素,再通过多因素分析确定影响术后并发症发生的独立危险因素。结果所有患儿均顺利完成手术,464例患儿中,共39例(8.4%)出现术后并发症,其中Clavied-DindoⅠ级7例、Ⅱ级12例、Ⅲ级20例,无Ⅳ级和Ⅴ级并发症发生,以肠梗阻、胆漏和急性胰腺炎发生率较高;并发症组39例中,19例(48.7%)行保守治疗,20例(51.3%)再次手术后痊愈。并发症组与无并发症组在患儿的术时年龄、儿科营养不良评估筛查工具(screening tool for the assessment of malnutrition in pediatrics,STAMP)评分、囊肿感染史、囊肿远端结石/蛋白栓、手术时间及术后住院时间等方面比较,差异有统计学意义(P<0.05)。logistic回归分析显示,STAMP评分、囊肿感染史和手术时间是导致出现术后并发症的独立危险因素。结论儿童腹腔镜胆总管囊肿根治术后常见的并发症以Clavied-DindoⅡ、Ⅲ级为主,最常见的并发症为肠梗阻;STAMP评分、囊肿感染史、手术时间是导致出现术后并发症的独立危险因素。展开更多
The concept of high entropy alloys(HEAs) or multi-principal component alloys has inspired a great progress of physical metallurgy along with several unusual phenomena. The high corrosion resistance of HEAs was frequen...The concept of high entropy alloys(HEAs) or multi-principal component alloys has inspired a great progress of physical metallurgy along with several unusual phenomena. The high corrosion resistance of HEAs was frequently mentioned but without convincing explanations. In this paper, the intrinsic mechanism of corrosion resistance in FCC HEAs was revealed by designing equal atomic alloys with single solid solution phase. The results showed that the Cr element in FCC HEAs played the dominant role in the corrosion resistance rather than the simple structure from high entropy effect or uniform element distribution.展开更多
基金Funded by the Research Fund of the State Key Laboratory of Solidification Processing(NWPU),China(No.126-QP-2015).
文摘The effect of graphite surface modification on the thermal conductivity(TC) and bending strength of graphite flakes/Al composites(Gf/Al) prepared by gas pressure infiltration were investigated. Al3 Ni and Al4C3 phase may form at the interface in Ni-coated Gf/Al and uncoated Gf/Al composites, respectively, while the Al-Cu compound cannot be observed in Cu-coated Gf/Al composites. The Cu and Ni coatings enhance TC and the bending strength of the composites in the meantime. TC of Cu-coated Gf/Al composites reach 515 Wm^-1·K^-1 with 75 vol% Gf, which are higher than that of Ni-coated Gf/Al. Meanwhile, due to Al3 Ni at the interface, the bending strength of Ni-coated Gf/Al composites are far more than those of the uncoated and Cu-coated Gf/Al with the same content of Gf. The results indicate that metal-coated Gf can effectively improve the interfacial bonding between Gf and Al.
文摘目的分析儿童腹腔镜胆总管囊肿根治术后并发症的发生情况,并探讨其危险因素。方法2015年8月至2023年6月广州医科大学附属妇女儿童医疗中心胃肠外科六病区共收治胆总管囊肿患儿498例,根据纳入标准对其中464例进行回顾性分析,将其中出现术后并发症的39例患儿作为并发症组,未发生并发症的425例患儿作为无并发症组。采用单因素分析术后并发症发生的影响因素,再通过多因素分析确定影响术后并发症发生的独立危险因素。结果所有患儿均顺利完成手术,464例患儿中,共39例(8.4%)出现术后并发症,其中Clavied-DindoⅠ级7例、Ⅱ级12例、Ⅲ级20例,无Ⅳ级和Ⅴ级并发症发生,以肠梗阻、胆漏和急性胰腺炎发生率较高;并发症组39例中,19例(48.7%)行保守治疗,20例(51.3%)再次手术后痊愈。并发症组与无并发症组在患儿的术时年龄、儿科营养不良评估筛查工具(screening tool for the assessment of malnutrition in pediatrics,STAMP)评分、囊肿感染史、囊肿远端结石/蛋白栓、手术时间及术后住院时间等方面比较,差异有统计学意义(P<0.05)。logistic回归分析显示,STAMP评分、囊肿感染史和手术时间是导致出现术后并发症的独立危险因素。结论儿童腹腔镜胆总管囊肿根治术后常见的并发症以Clavied-DindoⅡ、Ⅲ级为主,最常见的并发症为肠梗阻;STAMP评分、囊肿感染史、手术时间是导致出现术后并发症的独立危险因素。
基金supported by National Natural Science Foundation of China(Grant No.5147113)
文摘The concept of high entropy alloys(HEAs) or multi-principal component alloys has inspired a great progress of physical metallurgy along with several unusual phenomena. The high corrosion resistance of HEAs was frequently mentioned but without convincing explanations. In this paper, the intrinsic mechanism of corrosion resistance in FCC HEAs was revealed by designing equal atomic alloys with single solid solution phase. The results showed that the Cr element in FCC HEAs played the dominant role in the corrosion resistance rather than the simple structure from high entropy effect or uniform element distribution.
