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The occurrence of fractures in the vessel wall has been a major problem for human blood vessel cryopreservation. The large volumetric expansion of water during crystallization produces great inner stresses. To solve these complicated heat transfer and thermal stress problems, a model and an analytic method are presented in this paper, with which transient temperature field, the transient stress field inside the blood vessels during freezing can be calculated and analyzed, and the probable cracks or fractures can be predicted. The analytic results of sheep thoracic artery are consistent with the experimental observations of fractures.  相似文献
2.
利用自洽场理论的CNDO/2法的计算结果,研究了反应中间产物的化学键活性及溶剂的影响,对电化学法合成山梨酸前体乙酰氧基己烯酸的反应历程进行了解释。  相似文献
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