射频组织焊接散热电极的创新结构设计与实验验证

在射频组织焊接中,热损伤过大会导致组织坏死,影响术后恢复,为减少热损伤,需要有效地降低热扩散。本研究设计了一种采用空气强制对流方式散热的新型组织焊接电极,建立了有限元模型并对其散热性能进行分析,同时采用猪小肠进行离体组织焊接实验,验证散热电极的可行性和有效性。有限元分析结果显示,普通平板电极焊接温度为91.3℃,热损伤范围1.40 mm,散热电极温度61℃,热损伤范围0.77 mm;离体实验结果显示,平板电极温度为88.5℃,热损伤范围1.27~2.84 mm;散热电极温度为64.9℃,热损伤范围0.88~1.76 mm。仿真与离体实验结果均表明,在射频组织焊接电极处增加散热装置,可以有效降低焊接温度,减少组织热损伤。因此,该散热装置对促进电极散热,减少热量在组织中的聚集具有显著作用。本研究结果为射频组织焊接电极结构的优化与设计提供了新的思路和方法。

密集大扭转角自由曲面叶栅电解加工阴极结构设计

针对密集大扭转角自由曲面叶栅电解加工,论述了单方向全覆盖整体阴极的设计方法。大扭转角叶栅电解加工阴极设计中存在电极覆盖性不好、叶栅通道狭窄和电极通过性差等问题。采用优化电极进给方向与加工型面相结合的方式,预先设计多组不同厚度电极和不同余量叶片逆向寻找最佳的参数组合方式,并在UG软件干涉模块模拟下,验证优化后电极的有效性。结果表明:电极进给方向和加工型面共同优化的方式能有效解决叶片自由曲面覆盖性不好等问题。以最小电极厚度为初始值,逆向寻找厚度和余量参数组合方式,不仅能缩短电极设计和路径规划的时间周期,而且能节省前期大量试验投入。

术中乳腺癌灶边缘界定的电极及测量方案

在保乳手术中确定癌灶边缘具有重要意义.根据癌组织与正常乳腺组织阻抗特征不同的特点,设计了3种测量阻抗的电极,ANSYS有限元仿真分析得出弧形电极性能较优的结论.采用弧形电极对动物组织进行实验,验证了仿真结果,并发现阻抗虚部的频率特性具有良好的组织区分能力.该方法为在术中快速判定癌灶边缘提供了技术手段,可减少术中等待时间,从而减轻病人心理和生理的痛苦.

Relationship between initial efficiency and structure parameters of carbon anode material for Li-ion battery

The initial efficiency is a very important criterion for carbon anode material of Li-ion battery.The relationship between initial efficiency and structure parameters of carbon anode material of Li-ion battery was investigated by an artificial intelligence approach called Random Forests using D10,D50,D90,BET specific surface area and TP density as inputs,initial efficiency as output.The results give good classification performance with 91%accuracy.The variable importance analysis results show the impact of 5 variables on the initial efficiency descends in the order of D90,TP density,BET specific surface area,D50 and D10;smaller D90 and larger TP density have positive impact on initial efficiency.The contribution of BET specific surface area on classification is only 18.74%,which indicates the shortcoming of BET specific surface area as a widely used parameter for initial efficiency evaluation.

Recent progress on intramolecular charge-transfer compounds as photoelectric active materials

This article summarized the recent advance on the structural design and synthetic strategies of intramolec- ular charge-transfer compounds as well as their potential ap- plications in two-photon absorption chromophores, organic photovoltaics and organic light-emitting diodes.