化学元素

In this study, we used poly L-latcide, poly DL-latcide-co-glycolide 75:25 (PLGA7525) and poly DL-latcide-co-glycolide 50:50 (PLGA5050) during citric acid inducing ammonium bicarbonate gas forming process to form porous polymer film, and rolled the porous polymer film to make nerve conduits with pores and multi-layered. Electron Spectroscopy for Chemical Analyzer and Attenuated Total Reflectance – Fourier-Transform Infrared Spectrometer were employed for determining elements' functionabilities and chemical compounds. Charge Coupled Device camera and Scanning Electron Microscope were employed for macroscopic and microscopic morphologies and structural observation. Differential Scanning Calorimetry was employed for measuring glass-transition temperature. Nano-indentation system was employed for measuring elastic modulus and hardness. Biodegradation and water absorption ratios were measured to analyze their chemical properties and SEM was employed for microscopic morphology of the tested nerve conduit.

本研究将以聚乳酸、聚乳酸-聚甘醇酸共聚合物（75：25）、聚乳酸-聚甘醇酸共聚合物（50：50）做为研究材料，以柠檬酸诱发碳酸氢铵发泡之气泡成型法制作具有相连通孔隙之高分子薄膜，再将高分子薄膜卷制成特殊多层的导管，制作具有多层孔隙之新型神经再生导管，以电子能谱化学分析及减弱式全反射-傅立叶转换红外线光谱分析进行成份分析及化学元素测定；以电荷耦合元件摄影机、扫瞄式电子显微镜进行多层孔隙型神经导管巨观及微观形态结构观察；以示差扫瞄热量量测分析玻璃转换温度、奈米三维量测弹性模数及硬度；以及进行降解性质测定，并以扫瞄式电子显微镜进行降解后之导管微观结构形态观察。

"Uranium Chemical element of the actinide series (with many transition element properties), chemical symbol U, atomic number 92. A dense, hard, silvery white metal that tarnishes in air,"

铀：周期表IIIb族锕系放射性化学元素，化学符号U，原子序数92，铀是致密的银白色金属，其硬度不足以刻划玻璃，于空气中会失去光泽。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。