最小体积法玻璃化保存的研究进展

在低温保存领域,玻璃化能有效防止冰晶的形成,具有良好的保存效果。玻璃化保存需要的条件是极快的降温速率和高浓度的低温保护剂,但高浓度低温保护剂会对细胞造成渗透损伤和毒性损伤。最小体积法能通过减小样本体积,大大提高降温速率,降低实现玻璃化所需的保护剂浓度。本文综述了最小体积法玻璃化保存的最新研究进展,包括有载体的微滴玻璃化保存、喷射微滴玻璃化保存、生物打印微滴玻璃化保存和微流体封装微滴玻璃化保存。其中,喷射微滴玻璃化保存、生物打印微滴玻璃化保存及微流体封装微滴玻璃化保存,是将新型的微滴产生技术与玻璃化技术相结合,因其能迅速产生大小均匀的微滴,具有高通量特点,在低温保存领域具有很大的发展潜力。

基于不同电流跟踪方式APF连接电感选取与设计

针对有源电力滤波器(APF)设计过程中对输出电感值的选取及制作存在的盲目性,提出基于瞬时值比较电流跟踪方式和三角波比较电流跟踪方式的电感值选取原则,并详细阐述基于定时器控制的瞬时值比较电流跟踪方式计算电感值的方法。根据有源滤波的特点提出了采用铁硅铝作为铁心材料,利用最小体积法对电感进行了优化设计。最后通过实验验证了电感选取和设计的合理性。

Low dispersion finite volume scheme based on reconstruction with minimized dispersion and controllable dissipation

The reconstruction with minimized dispersion and controllable dissipation(MDCD) optimizes dispersion and dissipation separately and shows desirable properties of both dispersion and dissipation.A low dispersion finite volume scheme based on MDCD reconstruction is proposed which is capable of handling flow discontinuities and resolving a broad range of length scales.Although the proposed scheme is formally second order accurate,the optimized dispersion and dissipation make it very accurate and robust so that the rich flow features encountered in practical engineering applications can be handled properly.A number of test cases are computed to verify the performances of the proposed scheme.