Effect of Molecular Weight of PCL on the Structure and Mechanical Properties of PCL/PET Composite Vascular Scaffold Prototype

A new scaffold has been developed,which made from poly(ε-caprolactone)( PCL) membrane with porous structure,and reinforcement of PCL scaffold was achieved by embedding polyethylene terephthalate(PET) weft-knit tubular fabric. The aim of this paper is to study the variation tendency of the morphology and the mechanical properties of the sample with the changing of molecular weight. Weighing method was used to analyze the porosity of the sample,and scanning electron microscopy( SEM) images were taken to observe porous structure. The tensile and compressive strengths of the samples were tested by the universal mechanical tester and radial compression apparatus, respectively. And the results showed that the porosity and compressive strength were improved when increasing the molecular weight,and the elastic recovery rate was also improved slightly. However, molecular weight has little impact on the tensile strength properties,because the PET tubular fabric provides most of the strength support rather than PCL membrane.     

复方益精口服液抗疲劳作用的实验研究

为了进一步研究复方益精口服液的抗疲劳作用,选用体重为18-22g的SPF级ICR小鼠为实验动物,给予0.05g生药/10g体重剂量的复方益精口服液10d后,采用小鼠负重游泳实验以及测定血清尿素氮、血乳酸和肝糖原含量为指标,以判定其抗疲劳作用。结果显示:服药组小鼠负重游泳的平均时间(196.02±36.542min)明显比对照组(59.10±25.549min)长(P<0.01);运动后血清尿素氮、血乳酸水平则显著低于对照组(P<0.01);肝糖原含量明显高于对照组(P<0.01),表明复方益精口服液具有缓解疲劳的功能。     

负载型钯催化剂用于氯代芳烃Suzuki交叉偶联反应的研究进展

Suzuki交叉偶联反应是一类典型的形成碳-碳单键的反应,是以金属钯(Pd)为催化剂,卤代芳烃与有机硼酸化合物进行的交叉偶联反应.相对于传统仅用价廉易得的氯代芳烃化合物为反应原料的Suzuki交叉偶联反应,负载型Pd催化剂有着催化高效、分离简便、可重复使用等优点.简述了不同载体负载的Pd催化剂对于氯代芳烃的Suzuki交叉偶联反应的研究进展.     

一种桥梁状态监测信号采集的硬件设计

提出一种桥梁检测装置的硬件技术方案,完成了其中的实验,报告了部分成果。实验证明,该技术方案科学可行,可以用于桥梁检测的实际工程中。     

一种桥梁状态监测信号采集的软件设计

提出一种桥梁检测装置的软件设计方案,讨论了桥梁监测信号采集的关键问题,完成了相关的编程工作,报告了部分软件流程。实验证明,该技术方案科学可行,可以用于桥梁检测的实际工程中。