水辅助注塑大直径介质导管制品的冷却分析

采用数学分析方法，通过假设、简化分析模型，用数学模型来表述物理模型，确定了水辅助注塑(VAIM)大直径介质导臂制品的冷却时间，并运用算例和国外试验的结果进行验证。结果发现：水辅助注射成型新工艺可以更加显著地缩短注塑周期，降低制件壁厚，允许制件有更大的实际直径。因此，VAIM技术可用来高效率地生产大直径、高质量、薄壁的介质导臂。     

考虑纤维波动[＋φ／-φ]缠绕角管件的轴向弹性模量计算方法

本文在计算[ φ/-φ]缠绕角管件的轴向弹性模量时,通过引入纤维波动程度参数来计入纤维波动的影响,理论计算结果与层板理论计算结果相比更接近实验结果,说明本文提出的算法,可在一定程度上计入纤维波动的影响。     

复合材料纤维缠绕成型CAD/CAM相关技术研究

纤维缠绕成型是制造高强度复合材料制品的一种重要的工艺方法，将CAD／CAM方法应用其中可以大大提高生产效率，降低设计成本。本文提出了纤维缠绕CAD／CAM系统的总体方案，并对其中缠绕数学模型、线型优化、丝嘴轨迹生成等量要组成部分进行了分析与研究，为CAD／CAM系统的开发奠定了理论基础。     

Effect of Mode of Drying on Microstructure of Potato

Potato v. Irga was subjected to blanching, and thereafter was dried by convection, puff-drying, and freeze-drying. Microstructure of raw, blanched, and dried tissue was analyzed under the light microscope using computer image analysis. It was found that the tissue of the investigated variety is built up from cells much smaller than those described in literature for other cultivars. Blanching caused starch gelatinization and increase of cross-sectional area of cells. There was no evidence of broken cell walls. Convective drying resulted in cell shrinkage and some breaking of cell walls. It was estimated that some 12% of cells lost integrity during drying. Limited disintegration of the tissue caused by convective drying is attributed to small size of cells, large contact area, and high cohesive forces between cells. Puff-drying damaged the tissue much more than the convective drying. The most devastating to tissue microstructure was freeze-drying, probably freezing per se.     

Hydrolysis of human horny cells by alkaline protease: Morphological observation of the process

The interaction of highly purified alkaline protease fromBacillus sp. KSM-K16 with the horny cells of human skin contained in skin grime was directly visualized by electron microscopy. It became clear that the protease first penetrates the horny cells and then adsorbs, mainly onto the internal structure of the cells at the initial stage of hydrolysis, and directly hydrolyzes the keratin filaments, though the marginal band surrounding them retains its original shape. Then, hydrolysate produced from the keratin filaments flows out of the cell, and early in the hydrolysis process keratin filaments decrease and then disappear, leaving a marginal band, i.e., the cell turns to a hollow state. As a result, the remaining marginal band loses support from inside the cell, thus promoting cleavage and dispersion. Until this stage in the protease reaction, the remarkable liberation of hydrolysis products as water-soluble protein does not occur.     

改善普通水泥耐久性的研究

研究了活性组分及少量的引气剂对水泥性能的影响。实验表明：活性组分或与少量的引气剂复合使用，降低了水泥砂浆的大孔体积和干缩率，提高了其抗渗性、抗化学侵蚀性、抗钢筋锈蚀性，并改善了水泥砂浆的某些力学性能。     

TCS技术12头纺生产涤纶FDY工艺探讨

采用热管纺丝 (TCS)技术 12头纺生产涤纶FDY ,替代传统的热导丝辊式生产涤纶FDY的模式 ,具有短流程、低能耗、易维修、少投入、高效益等特点。本文对采用TCS技术 12头纺生产 76dtex 2 4f涤纶FDY的纺丝工艺 ,及它们对生产、产品质量的影响进行了探讨。纺丝速度为 480 0m min ,热管温度控制在 170～ 175℃时 ,产品质量良好     

短纤维直径对橡胶复合材料性能的影响

制备了 3种具有不同直径、相同长径比及其分布的涤纶短纤维增强氯丁橡胶基复合材料。对屈服强度及伸长率、断裂强度及伸长率以及撕裂强度等力学性能的研究发现 :在相同长径比及其分布情况下 ,与传统混合法则不同的是屈服强度和伸长率不相等 ,也不是只取决于短纤维的直径 ,而是受直径和长度的共同作用 ;在相同的纤维体积分数时 ,复合材料的断裂强度基本相同 ,而断裂形变和撕裂强度随纤维直径的减小而增大     

熔体直纺12改18头纺技术探讨

以TMT的615R 12饼卷绕头改18饼为例介绍了多丝饼改造技术,以及纺同一品种丝的工艺和生产情况,并对改造前后纺同一品种的丝的物理指标进行了比较,认为多丝饼改造是目前生产差别化纤维,提高产品附加值比较理想的方法。     

包覆油酸的Fe_3O_4纳米粒子的制备

用FeSO4和FeCl3在氨水和油酸作用下,共沉淀制备了包覆油酸的Fe3O4纳米粒子,考察了沉淀温度、油酸加入前反应时间及总铁离子浓度对其粒径的影响。结果显示,沉淀温度的升高和油酸加入前反应时间的延长,均可使Fe3O4粒径增大。沉淀温度从20℃增加到80℃,粒径从大约5 nm增加到8 nm;油酸加入前反应时间从10 min延长到30 min,粒径从大约3 nm增加到8 nm。c(总铁离子)=0.1~1.1 mol/L时对粒径没有显著影响,Fe3O4粒径均为8 nm左右,c(总铁离子)>1.1 mol/L时,粒径明显减小。