食管黏膜组织在轴向延伸下的摩擦特性研究

对食管黏膜组织沿轴向分别以不同的延伸率进行延伸,再通过往复摩擦试验近似模拟内镜前端进入食管的过程,研究了食管黏膜组织在不同轴向延伸率伸长下的摩擦性能变化.结果表明:从轴向无延伸到延伸率达到80%时,内镜前端与食管黏膜组织间的摩擦运行行为从食管黏膜组织只发生弹性变形的黏着状态变化到黏着和滑移的混合状态,摩擦阻力和能耗增大,摩擦系数增加.食管黏膜组织的摩擦学性能与其表面结构和力学性能密切相关.在沿轴向延伸率逐渐增加的延伸状态下,食管黏膜表面的皱褶被拉平,维持黏液润滑的特性变差;随着食管黏膜组织轴向延伸率的增加,黏膜组织的弹性模量增加,抵抗摩擦变形的能力增强,摩擦阻力增大.研究结果为临床胃镜诊疗的安全操作提供了理论依据.     

新型高能材料的设计思路初探

从现有的火药理论和工艺出发,设计一种理论上具有应用前景的新型高能分子。同时,结合现有的物理化学,有机化学以及结构化学理论,解释另一种本小组原创性的高能材料设计思想。     

Effect of metal surface morphology on nano-structured patterns induced by a femtosecond laser pulse and its experimental verification

The effect of material surface morphology on the periodic subwavelength of nano-structures induced by a femtosecond(fs) laser was investigated systematically from the initial surface roughness, the different scratches, the pre-formed ripples, and the "layer-carving" technology experiments. The results of the comparative experiments indicate that the initial surface conditions of the target surface have no obvious effects on the spatial structured periods(SSPs) and the ripple orientation of the periodic nano-structures induced by a fs laser, which agreed well with the foretold present surface two-plasmon resonance(STPR) model. Furthermore, different shapes of nanogrids with high regularity and uniformity were obtained by fs-laser fabrication.