内蒙古呼和浩特抽水蓄能电站工程关键技术问题研究

呼和浩特抽水蓄能电站位于高寒地区,电站水头高,工程复杂.涉及关键技术难题多施工难度大.通过试验研究,呼和浩特抽水蓄能电站采用了沥青混凝土、混凝土喷涂保温、并大规模进行高压钢管及岔管国产化,为高寒地区水电工程建设积累了可贵经验.     

内蒙古呼和浩特抽水蓄能电站工程关键技术问题研究

呼和浩特抽水蓄能电站位于高寒地区,电站水头高,工程复杂。涉及关键技术难题多施工难度大。通过试验研究,呼和浩特抽水蓄能电站采用了沥青混凝土、混凝土喷涂保温、并大规模进行高压钢管及岔管国产化,为高寒地区水电工程建设积累了可贵经验。     

齿轮用钢稀土碳氮共渗层摩擦学性能研究

研究了稀土元素对齿轮钢碳氮共渗过程及其摩擦磨损性能的影响.结果表面:稀土对齿轮钢碳氮共渗过程有明显的催渗作用;稀土在碳氮共渗中渗入钢表面起微合金化作用改善了渗层组织;稀土碳氮共渗处理后的抗干磨损性能及抗滑动磨损性能均明显优于普通碳氮共渗处理.     

Effect of Rare Earths on Tribological Properties of Carbon Fibers Reinforced PTFE Composites

Carbon fibers （CF） were surface treated with air-oxidation and rare earths （RE）, respectively. The effect of RE surface treatment on tensile strength and tribological properties of CF reinforced polytetrafluoroethylene （PTFE） composites was invest/gated. Experimental results revealed that RE was superior to air ox/dation in improving the tensile strength, elongation, and the tensile modulus of CF reinforced PTFE （CF/PTFE） composite. Compared to the untreated and air-oxidated CF/PTFE composite, the RE treated composite had the lowest friction coefficient and specific wear rate under a given applied load and reciprocating sliding frequency. The RE treatment effectively improved the interfacial adhesion between CF and PTFE. With strong interfacial coupling, the carbon fibers carried most of the load, and direct contact and adhesion between PTFE and the counterpart were reduced, accordingly the friction and wear properties of the composite were improved.     

Effect of rare earths surface treatment on tribological properties of carbon fibers reinforced PTFE composite under oil-lubricated condition

The effect of rare earths （RE） surface treatment of carbon fibers （CF） on tribological properties of CF reinforced polytetrafluoroethylene （PTFE） composites under oil-lubricated condition was investigated. Experimental results revealed that RE treated CF reinforced PTFE （CF/PTFE） composite had the lowest friction coefficient and wear under various applied loads and sliding speeds compared with untreated and air-oxidated composites. X-ray photoelectron spectroscopy （XPS） study of carbon fiber surface showed that, after RE treatment, oxygen concentration increased obviously, and the amount of oxygen-containing groups on CF surfaces were largely increased. The increase in the amount of oxygen-containing groups enhanced interfacial adhesion between CF and PTFE matrix. With strong interfacial adhesion of the composite, stress could be effectively transmitted to carbon fibers; carbon fibers were strongly bonded with VITE matrix, and large scale rubbing-off of PTFE be prevented, therefore, tribological properties of the composite was improved.     

天线远场调试测量方法

天线研制、生产过程中,天线调试是一项重要工作。本文将天线测试和调试进行了一体化研究。详细研究了天线测试系统、测试环境、天线调测方法等,给出了具体的天线远场调测系统,并经试验验证了所研究的天线远场调测方法的合理性与可行性。     

UPLC-MS/MS法同时测定人血浆中氯沙坦及其代谢物浓度

建立UPLC-MS/MS法测定人血浆中氯沙坦及代谢物氯沙坦羧酸的浓度,以用于氯沙坦的药代动力学研究。采用Sepax GP-C18(2.1 mm×50 mm,1.8μm)色谱柱,以0.15%甲酸-0.04%氨水-水(超声20 min后,加入0.01%氨水)为水相,0.15%甲酸-0.04%氨水-98%乙腈为有机相。梯度洗脱,流量为0.3 mL/min。以d4-氯沙坦、d4-氯沙坦羧酸作内标,血浆样本用乙腈一步沉淀蛋白,采用多反应离子监测,正离子模式扫描,电喷雾离子源。结果表明:氯沙坦在2.0~2 000 ng/mL范围内,氯沙坦羧酸在2.4~2 400 ng/mL范围内线性良好;氯沙坦及内标的保留时间为1.16 min左右,氯沙坦羧酸及内标的保留时间为1.26 min左右;氯沙坦、氯沙坦羧酸提取回收率分别为109.9%、97.55%;精密度、基质效应经内标校准后均合格;稳定性各项数据均符合相关要求。该法快速、灵敏、专属性强、重现性好,适用于氯沙坦及其代谢物的血药浓度测定。     

塔带机在三峡二期大坝混凝土浇筑中的应用

塔带机浇筑混凝土具有水平、垂直运输二位一体，连续浇筑、生产率高、运行灵活等特点。尽管使用皮带机对四级配混凝土进行运送和布料国内外均无先例，但通过现场生产性试验及对塔带机浇筑混凝土工艺的不断总结，塔带机的使用技术得到了稳步提高，并较好地完成了三峡二期工程大坝混凝土浇筑工作。     

微型机械的摩擦学特性及其表面润滑技术的研究

综述了微型机械的摩擦学特性,阐述了微型机械中摩擦学问题研究的重要性,分析了影响微摩擦力的关键因素。基于目前国内外对微型机械表面润滑问题的研究现状,探讨了LB膜、自组装膜和分子沉积膜各自的特点及其在微型机械表面润滑领域的应用进展,对它们性能的优缺点进行了比较,并提出降低微型机械的表面能是减轻微摩擦磨损的有效措施。     

先进设备在三峡二期围堰防渗工程中的应用

介绍了三峡二期围堰防渗墙施工中使用的先进施工设备,以及设备的主要参数和使用情况。