The NiAl-28Cr-5.85Mo-0.15Hf alloy was prepared by high-pressure die casting (HPDC) and subsequent hot isostatic pressing(HIP), and tested for compressible strength and fracture behavior at 300-1 373 K. The results sho...The NiAl-28Cr-5.85Mo-0.15Hf alloy was prepared by high-pressure die casting (HPDC) and subsequent hot isostatic pressing(HIP), and tested for compressible strength and fracture behavior at 300-1 373 K. The results show that the elevated temperature 0.2% compressible yield strength as well as the room-temperature compressible fracture strain of as-HIP alloy are larger than those of the same alloy prepared by directional solidification (DS). It suggests that the fine structures with a homogeneous distribution of fine Cr (Mo) and Hf-rich phase created by high-pressure die casting lead to these improvements.展开更多
目的探讨高渗盐复合液(高渗盐水羟乙基淀粉HSH)在颅脑损伤合并低血容量性休克中的疗效及对颅内压(ICP)的影响。方法为前瞻、对照性研究。选择2007年9月至2008年7月入住广东省人民医院ICU及脑外科颅脑损伤且平均动脉压(MAP)低于60m...目的探讨高渗盐复合液(高渗盐水羟乙基淀粉HSH)在颅脑损伤合并低血容量性休克中的疗效及对颅内压(ICP)的影响。方法为前瞻、对照性研究。选择2007年9月至2008年7月入住广东省人民医院ICU及脑外科颅脑损伤且平均动脉压(MAP)低于60mmHg的患者60例,其中男51例,女9例,年龄18~69岁,平均(41.5±9.5)岁。排除标准:年龄〈18岁或〉70岁的患者;孕妇、月经期妇女;严重肝肾功能障碍;高血压、冠心病、糖尿病病史者;大出血未止住;治疗前数小时内应用过其它血管活性物质;受伤超过24h者;脑死亡。随机分成3组(每组20例),3组年龄性别构成具可比性,分别以平衡液(平衡液LR组)500ml、5%氯化钠(高渗盐水HIS组)4ml/kg、HSH(HSH组)4ml/kg进行液体复苏,记录复苏前及复苏30、60、120min时的血压、呼吸、心率、尿量等,抽静脉血检测凝血功能、电解质,应用颅内压无创检测分析仪测量ICP。采用SPSS13.0统计软件进行统计学处理数据,各组复苏前后指标应用重复测量设计资料的方差检验分析,组间比较应用(one—way analysis of variance ANOVA)检验分析,以P〈0.05为差异有统计学意义。结果复苏30min时HIS、HSH组MAP即恢复到60mmHg以上,且ICP降低10%以上;60min时LR组MAP恢复到60mmHg以上,但ICP无降低。120min时HSH提高MAP和降低ICP的作用优于LR、HIS组,差异有统计学意义(F=18.43,8.99,P〈0.05);各组用药前后实验室检测指标无明显变化(P〉0.05)。结论在颅脑损伤合并低血容量性休克的救治中HSH复苏效果及降低颅内压作用显著且持久,有利于保护脑功能。展开更多
基金Project (05YB31) supported by the Scientific Research Initial Foundation for Doctor of Shenyang Institute of Aeronautical Engineering,China
文摘The NiAl-28Cr-5.85Mo-0.15Hf alloy was prepared by high-pressure die casting (HPDC) and subsequent hot isostatic pressing(HIP), and tested for compressible strength and fracture behavior at 300-1 373 K. The results show that the elevated temperature 0.2% compressible yield strength as well as the room-temperature compressible fracture strain of as-HIP alloy are larger than those of the same alloy prepared by directional solidification (DS). It suggests that the fine structures with a homogeneous distribution of fine Cr (Mo) and Hf-rich phase created by high-pressure die casting lead to these improvements.
文摘目的探讨高渗盐复合液(高渗盐水羟乙基淀粉HSH)在颅脑损伤合并低血容量性休克中的疗效及对颅内压(ICP)的影响。方法为前瞻、对照性研究。选择2007年9月至2008年7月入住广东省人民医院ICU及脑外科颅脑损伤且平均动脉压(MAP)低于60mmHg的患者60例,其中男51例,女9例,年龄18~69岁,平均(41.5±9.5)岁。排除标准:年龄〈18岁或〉70岁的患者;孕妇、月经期妇女;严重肝肾功能障碍;高血压、冠心病、糖尿病病史者;大出血未止住;治疗前数小时内应用过其它血管活性物质;受伤超过24h者;脑死亡。随机分成3组(每组20例),3组年龄性别构成具可比性,分别以平衡液(平衡液LR组)500ml、5%氯化钠(高渗盐水HIS组)4ml/kg、HSH(HSH组)4ml/kg进行液体复苏,记录复苏前及复苏30、60、120min时的血压、呼吸、心率、尿量等,抽静脉血检测凝血功能、电解质,应用颅内压无创检测分析仪测量ICP。采用SPSS13.0统计软件进行统计学处理数据,各组复苏前后指标应用重复测量设计资料的方差检验分析,组间比较应用(one—way analysis of variance ANOVA)检验分析,以P〈0.05为差异有统计学意义。结果复苏30min时HIS、HSH组MAP即恢复到60mmHg以上,且ICP降低10%以上;60min时LR组MAP恢复到60mmHg以上,但ICP无降低。120min时HSH提高MAP和降低ICP的作用优于LR、HIS组,差异有统计学意义(F=18.43,8.99,P〈0.05);各组用药前后实验室检测指标无明显变化(P〉0.05)。结论在颅脑损伤合并低血容量性休克的救治中HSH复苏效果及降低颅内压作用显著且持久,有利于保护脑功能。