提高ＬＤ３１铝合金棒材质量的措施

分析了提高LD31铝合金棒材质量的措施和实际效果。提出了选择合理的化学成份和加强熔体精炼等方法 ,对LD31合金进行处理。     

LD冷作模具钢激光表面熔凝研究

研究了冷作模具LD钢经不同工艺参数激光熔凝处理后的显微组织及性能。结果表明,激光功率P=3500 W,扫描速度v=20 mm/s,光斑直径d=5 mm时,处理效果较为理想。由表及里依次为熔凝层、淬火层、热影响层和基体。熔凝层又依次分为表层等轴晶区,柱状晶区和等轴晶+胞状晶区。等轴晶区和柱状晶区原有的带状、块状碳化物全部溶解,胞状晶区原有的碳化物基本保持原状,新晶粒明显细化并均匀分布。硬化层总深度可达1.0 mm;平均硬度可提高15%左右,耐磨性和耐腐蚀性显著提高。如果能量密度过大,在熔凝层容易产生微裂纹甚至宏观裂纹,破坏材料性能。     

云南本地黄牛盐溶蛋白热诱导凝胶功能特性的研究

以云南本地黄牛的背最长肌和股二头肌为材料,采用L9(34)正交设计研究了不同提取条件对背最长肌和股二头肌的盐溶蛋白热诱导凝胶保水性、蛋白组分及凝胶超微结构的影响。结果表明,云南本地黄牛背最长肌和股二头肌的盐溶蛋白最佳提取条件均为NaCl 浓度0.6mol/L、温度70℃、pH7.0,凝胶的保水性分别是96.21%、96.35%。SDS-PAGE 电泳和扫描电镜显示,背最长肌和股二头肌在保水性最佳的条件下,其肌球蛋白含量较高,同时凝胶的网络比较均匀、细致。而保水性较差,其肌球蛋白含量比较低,凝胶网络结构粗糙、疏松、不均匀。     

120t LD-RH-LF CSP流程生产W600无取向硅钢的工艺实践

马钢一钢轧总厂通过120 t LD(顶底复吹)-RH-LF-70 mm和90 mm薄板连铸-连轧工艺生产W600无取向硅钢。通过控制转炉出钢[C]0.03%～0.04%,RH真空脱碳至0.002 5%C,RH脱碳前补加FeP,LF二次精炼脱硫,RH-LF调整Als等工艺措施控制钢中C≤0.005%、P 0.050%、Als 0.20%、N≤40×10^-6,所生产的W600钢铸坯成分均匀,钢板的力学性能满足技术要求。     

Development of an innovative soil remediation: "Cyclodextrin-enhanced combined technology"

This paper introduces an in situ "Cyclodextrin-enhanced soil bioremediation technology" which is a combination of 1. in situ bioventilation for biodegradation in the unsaturated soil zone; 2. physico-chemical treatment of the pumped ground water; 3. impulsive flushing for the three-phase soil. For enhancement of biodegradation and solubilization randomly methylated beta-cyclodextrin (RAMEB) was used. An additional aim of this study was to prove the importance of the technology monitoring which was used for characterisation of the soil processes by an integrated methodology. It consists of physico-chemical, biological and ecotoxicological methods specific for the contaminants. For technology monitoring the mobile soil phases--soil gas and ground water--were analysed. Sampling of the whole soil was carried out at the start and end of the technology application. RAMEB resulted in the enhanced removal of pollutants both from the saturated and unsaturated soil zones. Moreover, the biodegradation was more effective than the pump and treat technology, proved by the establishment of the carbon material balance in all soil phases.     

淬火温度对LD11活塞裙组织和性能的影响

在低于过烧温度(约为540℃)加热时,随着淬火温度的升高强度上升,塑性下降,品粒粗化程度不大:高于过烧温度加热,合金过烧,强度,塑性均迅速降低;其过烧特征最初表现为晶界局部加宽和复熔三角形的出现。     

LD端面泵浦Yb:YAG/LBO 537.8nm绿光激光器

报道了一种激光二极管（LD）端面泵浦10 at.- %掺杂Yb:YAG薄片激光晶体(Φ4×1mm)、LBO腔内倍频的全固态绿光激光器。采用平凹腔结构,在LD泵浦功率为1.37W时,通过调节非线性晶体LBO的放置角度,实现了频率选择,并获得了最高功率为3.1mW的537.8nm的基模连续激光输出,光斑椭圆度为0.94。     

蔗糖聚酯毒性研究——蔗糖聚油酸酯对小鼠经口急性毒性和蓄积毒性

考察了采用化学方法合成的蔗糖聚油酸酯（纯度在９８％ 以上）对昆明种小白鼠经口急性毒性和蓄积毒性实验,其经口ＬＤ５０ 大于１５ ０００ ｍ ｇ／ｋｇ,其蓄积系数ｋ 为６．６５,说明该蔗糖聚油酸酯属于无毒级物质,在小鼠体内几乎不具蓄积作用。     

蓝色波段发光和激光二极管的新进展

文章在简要概述了几种适合制备短波长发光器件材料－ＳｉＣ，ＧａＮ和ＺｎＳｅ的晶体结构、掺杂性质及外延技术后，主要介绍了它们在制备蓝色波段发光和激光二极管的新进展。