SA/AKP/PEG 4000神经导管的制备与表征

将神经导管植入损伤的神经组织处可促进神经恢复。受成本与技术的限制,湿法成型难以批量生产孔径大小和分布相对均匀的神经导管。为连续制备孔径大小及分布均匀的神经导管,以海藻酸钠、磷虾蛋白生物可降解材料作为基体,以PEG 4000作为致孔剂,通过低温湿法成型结合冷冻干燥方法制备了多孔神经导管支架材料,表征了材料的结构和性质。结果表明,PEG 4000有降低溶液的黏度、提高导管热稳定性的作用,导管截面具有蜂窝状孔洞结构,其孔径在10~20μm,最大孔隙率达到97%。导管为亲水材料,其吸液性能随PEG 4000质量分数呈先增大后减小的趋势,PEG 4000质量分数为30%~40%时导管的吸液性能达到1 417%。

鼻内镜技术在鼻出血治疗中的应用(附130例报告)

目的:探讨鼻内镜在鼻出血治疗中的应用价值。方法:对130例鼻出血患者,经鼻内镜寻找出血点并予止血治疗。结果:在鼻内镜直视下对发现的出血点采用低温等离子凝固止血治疗,60例患者同时行局部小范围区域性填塞,患者均获得满意的止血效果,无不良并发症。结论:鼻内镜下治疗鼻出血方法简单、效果好、患者痛苦小,无并发症。

萤石-硫酸法生产氟化氢的新构思

根据热力学求导计算,发现萤石、硫酸混合“低温不凝固”特性,提出萤石—硫酸法生产氟化氢冷流态预反应新构思。工艺新颖、技术可行、设备简单、实施方便,可用以取代KO捏合机。

Square concrete columns strengthened with carbon fiber reinforced plastics sheets at low temperatures

Twenty-one square concrete columns were constructed and tested. The testing results indicate that bonded carbon fiber reinforced plastics(CFRP) sheets can be used to increase the strength and improve the serviceability of damaged concrete columns at low temperatures. The failure of the specimens,in most cases,takes place within the middle half of the columns. And the failure of strengthened columns is sudden and explosive. The CFRP sheets increase both the axial load capacity and the ultimate concrete compressive strain of the columns. The ultimate loads of strengthened columns at-10,0 and 10 ℃ increase averagely by 9.09%,6.63% and 17.83%,respectively,as compared with those of the control specimens. The axial compressive strength of strengthened columns is related to the curing temperatures. The improvement of axial compressive strength decreases with reducing temperature,and when the temperature drops to a certain value,the improvement increases with falling temperature.