钛合金PEO陶瓷膜的组成结构及其抗热震性能

在硅酸盐溶液中,采用类三角波形脉冲等离子体电解氧化电源,在TC4钛合金表面原位制备陶瓷膜层,利用XRD、SEM和能谱等研究了陶瓷膜层的组成和结构特点,利用热震实验研究了陶瓷膜层的抗热震性能.陶瓷膜层主要由金红石型和锐钛矿型TiO_2组成,反应时间增加,膜层增厚,表面放电孔道减少,孔径变大.能谱分析表明,陶瓷膜层中硅元素含量随着反应时间的增加而增多,钛元素含量的变化与之相反.在900～20 ℃热震条件下,膜层的抗热震性能随反应时间的增大而提高,在反应为25 min时,所制备的膜层抗热震性能最佳,继续延长反应时间,膜层的抗热震性能下降.热震试验使陶瓷膜层中晶相TiO_2含量增加,膜层表面出现裂纹.     

取代芳烃急性毒性的自相关拓扑研究

提出表征成键原子生物活性的特征值Ai,由Ai建构自相关拓扑指数tF,并用0阶指数0F,1价指数1F研究了取代芳烃对发光菌、呆鲦鱼的急性毒性,给出了相关方程。结果表明,新方法计算简单,应用方便,估算结果均优于相应的文献方法。     

轨道交通车辆内饰用水性聚氨酯砂纹面漆的研究与应用

针对轨道交通车辆内饰件涂层高耐磨性、高附着力等防护性能及低甲醛、低总挥发性有机物的环保性要求,本研究采用羟基丙烯酸分散体、相分离技术自消光树脂,以聚乙烯砂纹粉作为效应填料,以丙二醇二醋酸酯为助溶剂,选用亲水改性多异氰酸酯三聚体为固化剂,并添加其他填料和功能性助剂等原材料,研制了一种对玻璃钢等复合材料具有优异附着力、耐磨性好,同时低挥发性有机物含量的水性聚氨酯砂纹面漆。重点研究了通过不同消光手段制备水性聚氨酯砂纹面漆的方法和对防护性能的影响;分析了不同助溶剂对内饰件成品残存 VOC的影响,并筛选了不同粒径砂纹粉对涂膜外观效果的影响。研究结果表明：所研制的轨道交通车辆内饰用水性聚氨酯砂纹面漆在达到防护性能指标要求的同时,具有优异环保性能,可以满足轨道交通车辆行业绿色涂装要求。     

TPO／CPO形态、界面结构及粘结性能研究的最新进展

从介绍热塑性聚烯烃TPO及其在汽车工业中的应用出发,综述了近年来国内外在TPO组分的相容性、TPO的形态和性能、TPO／CPO（氯化聚烯烃）的界面形态和结构、TPO／CPO粘结性能和机理几个方面研究的最新进展,并提出了未来的发展趋势。     

基于VIS打标系统的二维码标刻工艺研究

激光系统的打标速度、频率、填充间隔、功率等工艺参数直接影响二维码标刻效果。实验基于VIS打标系统,针对汽车行业铸铁材质发动机的二维码激光直接标刻,利用二维码读码器对激光标记进行读码率的测量,通过改变激光加工参数,研究激光工艺参数对二维码标刻效果的影响。实验表明,通过对频率、填充间隔和速度三个激光参数进行相互协调,得出10%左右的光斑重叠率和较小的线间距,能够得到对比度高的标记,从而获得高的读码率。     

金属／溶液界面氧化还原反应的量化处理初探

对金属腐蚀体系中界面反应进行综合量子化学处理还是一个探索性的工作,本文用简化势垒模型的方法,把问题适当简化后进行量化计算,给出了微观参数与界面反应速率的半定量关系式,并同电化学测量结果相比较,证明了该计算所给出的半定量判断与实验事实相等。     

Imaging of near-Earth space plasma

This paper describes the technique of imaging the ionosphere using tomographic principles. It reports on current developments and speculates on the future of this research area. Recent developments in computing and ionospheric measurement, together with the sharing of data via the internet, now allow us to envisage a time when high-resolution, real-time images and 'movies' of the ionosphere will be possible for radio communications planning. There is great potential to use such images for improving our understanding of the physical processes controlling the behaviour of the ionosphere. While real-time images and movies of the electron concentration are now almost possible, forecasting of ionospheric morphology is still in its early stages. It has become clear that the ionosphere cannot be considered as a system in isolation, and consequently new research projects to link together models of the solar-terrestrial system, including the Sun, solar wind, magnetosphere, ionosphere and thermosphere, are now being proposed. The prospect is now on the horizon of assimilating data from the entire solar-terrestrial system to produce a real-time computer model and 'space weather' forecast. The role of tomography in imaging beyond the ionosphere to include the whole near-Earth space-plasma realm is yet to be realized, and provides a challenging prospect for the future. Finally, exciting possibilities exist in applying such methods to image the atmospheres and ionospheres of other planets.     

Ion channel mimetic micropore and nanotube membrane sensors

This paper describes synthetic micropore and nanotube membranes that mimic the function of a ligand-gated ion channel; that is, these membranes can be switched from an "off" state (no or low ion current through the membrane) to an "on" state (higher ion current) in response to the presence of a chemical stimulus. Ion channel mimics based on both microporous alumina and Au nanotube membranes were investigated. The off state was obtained by making the membranes hydrophobic by chemisorbing either a C18 silane (alumina membrane) or a C18 thiol (Au nanotube membrane). Water and electrolyte are forbidden from entering these very hydrophobic pores/nanotubes. The transition to the on state was induced by the partitioning of a hydrophobic ionic species (e.g., a drug or a surfactant) into the membrane. The membrane switches to the on state because at a sufficiently high concentration of this ionic analyte species, the pores/nanotubes flood with water and electrolyte. A pH-responsive membrane was also prepared by attaching a hydrophobic alkyl carboxylic acid silane to the alumina membrane.     

Integrated electro-optic lens/scanner in a LiTaO3 single crystal

We report what we believe to be the first stand-alone integrated electro-optic lens and scanner fabricated on a single crystal of Z-cut LiTaO(3). The independently controlled lens and scanner components consist of lithographically defined domain-inverted regions extending through the thickness of the crystal. A lens power of 0.233 cm(-1) kV(-1) and a deflection angle of 12.68 mrad kV(-1) were observed at the output of the device.