The electrochemical behaviors of commercially pure titanium (CP Ti) and Co-Cralloy in Ringer's solution have been investigated. The results indicate that the electric potentialof passive region for CP Ti is up to ...The electrochemical behaviors of commercially pure titanium (CP Ti) and Co-Cralloy in Ringer's solution have been investigated. The results indicate that the electric potentialof passive region for CP Ti is up to 3000 mV, and its passive current density is 3.078 μA/cm^2.The excellent corrosion resistance of CP Ti can be attributed to the formation of TiO_2 oxide film.The passive region of Co-Cr alloy is 770 mV, which is narrower than that of CP Ti. However, nohysteresis loops are found in the reverse scanning curves of Cu-Cr alloy. A complex oxide film ofCo_3O_4, Co_2O_3, and Cr_2O_3 formed on the surface provides Co-Cr alloy with a stableelectrochemistry property. The corrosion rates of the crevice samples increase with the pH value ofmedium decreasing. The electron probe microanalyzer (EPMA) analysis indicates that Ti in CP Ti andCo, Cr in Co-Cr alloy dissolve in crevice area due to the Sealed-Cell effect.展开更多
目的:探讨成人和儿童术前乳酸林格氏液液体动力学的差别。方法:本研究是随机,双盲前瞻性研究。择期盆腔、肛肠或者下肢小手术患者28例,美国麻醉医师协会(ASA)I级,其中儿童14例,成人14例。所有患者给予镇静药后在20 min内恒速输入10 m L...目的:探讨成人和儿童术前乳酸林格氏液液体动力学的差别。方法:本研究是随机,双盲前瞻性研究。择期盆腔、肛肠或者下肢小手术患者28例,美国麻醉医师协会(ASA)I级,其中儿童14例,成人14例。所有患者给予镇静药后在20 min内恒速输入10 m L/kg的乳酸林格氏液体,通过血红蛋白(Hb)稀释-时间曲线和尿量采用Matlab 4.2软件包计算液体动力学参数。结果:一级动力学模型拟合结果显示,与成人相比,在输入林格氏液体后90 min内儿童的血浆稀释程度明显降低(0.16 vs 0.07,P=0.000),儿童将输入液体的43%通过肾脏排出,显著高于成人(18%)(P=0.011)。按公斤体重计算儿童和成人对乳酸林格氏液的血浆清除率分别是2.2 m L·min-1·kg-1和0.5 m L·min-1·kg-1(P=0.016),而肾脏对乳酸林格氏液体的清除率两组分别是0.76 m L·min-1·kg-1和0.10 m L·min-1·kg-1,(P=0.000)。结论:儿童对乳酸林格氏液体血浆和肾脏清除率分别是成人的4倍和7倍,术前给儿童输液,按照体重计算量可以参照成人的剂量。展开更多
基金This project is financially supported by the Natural Science Foundation of Liaoning Province (No.972210), China
文摘The electrochemical behaviors of commercially pure titanium (CP Ti) and Co-Cralloy in Ringer's solution have been investigated. The results indicate that the electric potentialof passive region for CP Ti is up to 3000 mV, and its passive current density is 3.078 μA/cm^2.The excellent corrosion resistance of CP Ti can be attributed to the formation of TiO_2 oxide film.The passive region of Co-Cr alloy is 770 mV, which is narrower than that of CP Ti. However, nohysteresis loops are found in the reverse scanning curves of Cu-Cr alloy. A complex oxide film ofCo_3O_4, Co_2O_3, and Cr_2O_3 formed on the surface provides Co-Cr alloy with a stableelectrochemistry property. The corrosion rates of the crevice samples increase with the pH value ofmedium decreasing. The electron probe microanalyzer (EPMA) analysis indicates that Ti in CP Ti andCo, Cr in Co-Cr alloy dissolve in crevice area due to the Sealed-Cell effect.
文摘目的:探讨成人和儿童术前乳酸林格氏液液体动力学的差别。方法:本研究是随机,双盲前瞻性研究。择期盆腔、肛肠或者下肢小手术患者28例,美国麻醉医师协会(ASA)I级,其中儿童14例,成人14例。所有患者给予镇静药后在20 min内恒速输入10 m L/kg的乳酸林格氏液体,通过血红蛋白(Hb)稀释-时间曲线和尿量采用Matlab 4.2软件包计算液体动力学参数。结果:一级动力学模型拟合结果显示,与成人相比,在输入林格氏液体后90 min内儿童的血浆稀释程度明显降低(0.16 vs 0.07,P=0.000),儿童将输入液体的43%通过肾脏排出,显著高于成人(18%)(P=0.011)。按公斤体重计算儿童和成人对乳酸林格氏液的血浆清除率分别是2.2 m L·min-1·kg-1和0.5 m L·min-1·kg-1(P=0.016),而肾脏对乳酸林格氏液体的清除率两组分别是0.76 m L·min-1·kg-1和0.10 m L·min-1·kg-1,(P=0.000)。结论:儿童对乳酸林格氏液体血浆和肾脏清除率分别是成人的4倍和7倍,术前给儿童输液,按照体重计算量可以参照成人的剂量。
