糖尿病大鼠微量元素与动脉血栓形成的关系

为研究糖尿病大鼠微量元素的含量变化及其与动脉血栓形成的关系,用链脲佐菌素（STZ）诱导出糖尿病大鼠模型,三氯化铁（FeCl3）造颈总动脉血栓后,测定血糖、胰岛素（INS）、6-酮-前列腺素F1α（6-K-PGF1α）、血栓素B2（TXB2）、内皮素（ET1）以及全血微量元素镁、锌含量。结果表明,①与正常对照组比,糖尿病大鼠的血糖、TXB2、ET1和锌的含量、ρ（TXB2）／ρ（6-K-PGF1α）、（T／P）比值及血栓质量增加（P〈0．05）,INS含量降低（P〈0．001）,镁和6-K-PGF1α含量无改变（P〉0．05）;②糖尿病组的TXB2与糖、锌（P=0．001）、胰岛素正相关（P=0．003）,ET1仅与锌正相关（P=0．096）,6-K-PGF1α与镁、锌无相关关系。提示：①糖尿病大鼠血管内皮功能受损,血液处于T／P失衡的高凝状态,更易形成动脉血栓;②糖和锌代谢紊乱在T／P失衡和内皮功能损伤中有重要作用。     

Insulator-Metal Transition due to La Doping in Double Perovskite Sr2MnMoO6

Resistivity, thermal diffusivity, lattice and magnetic properties of double perovskite Sr2-xLaxMnMoO6 are investigated with systematic change of La doping concentration x from 0.0 to 0.4. The insulator to metal phase transition is observed with increasing x above 0.3, suggesting that the extra electrons via substitution of La^3 for Sr^2 ions occupy mainly the conduction Mo-4d band. According to the insulator to metal phase transition, the thermal diffusivity of Sr2-xLaxMnMoO6 enhances from 0.33cm^2/s at x=0.0 to 0.49cm^2/s at x=0.4. We further investigate the La doping effects on the lattice and magnetic properties.     

Thermal Diffusivity of Film/Substrate Structures Characterized by Transient Thermal Grating Method

Transient thermal grating method is used to measure the thermal diffusivity of absorbing films deposited on transparent substrates. According to periodically modulated dielectric constant variations and thermoelastic deformations of the thin films caused by the transient thermal gratings, an improved optical diffraction theory is presented. In the experiment, the probing laser beam reflectively diffracted by the thermal grating is measured by a photomultiplier at different grating fringe spaces. The thermal diffusivity of the film can be evaluated by fitting the theoretical calculations of diffraction signals to the experimental measured data. The validity of the method is tested by measuring the thermal diffusivities of absorbing ZnO films deposited on glass substrates.     

用激光引发热反射栅方法测量固体热扩散率

阐述了用脉冲激光引发瞬态热反射栅的方法来测量固体材料热扩散率的理论、实验装置和实验技术．给出用该实验方法测得的纯硅和纯铜的热扩散率，并与文献数据进行了比较，结果表明该方法是一种适用于不透明固体材料热扩散率测量的无损、快速和准确的方法．