【摘要】 微珠状热敏电阻作为球形热源传热模型的基础上 ,提出适用于较宽温区生物组织导热系数测量的方法 ,同时为解决小尺度生物组织的测量提供了有效途径 .对标准样品在 2 33～ 31 3K温度范围导热系数测量的最大误差为 5.1 % .在 2 33～ 2 93K温度范围内对家兔新鲜离体器官心脏、肝脏、肾脏和颈动脉血管的导热系数进行了实验测定 ,结果表明生物组织在低温下的导热系数与冰的相差很大 .更多还原

【Abstract】 A novel method using a tiny thermistor as a spherical heat source has been developed to determine thermal conductivity of biomaterials over a wide temperature range. Based on steady-state spherical heat transfer in an infinite homogeneous medium, thermal conductivity of the measured medium can be determined from the power applied and the temperature rise of the self-heated thermistor. Compared with recommended value, maximum measurement error of thermal conductivity for some standard samples is 5.1% in the temperature range 233～313K. Using the developed technique, thermal conductivities of rabbit liver, kidney, heart, and carotid artery were determined in the temperature range 233～293K; the results show that there exists a significant difference between pure ice and frozen tissues below zero temperature.更多还原