离子束分析在艺术和考古学中的应用

本文通过与运用其它分析技术的同类工作进行比较来述评离子束分析法在艺术和考古学研究中的应用。为了说明离子束分析法的利弊,精选了一些实例来阐述该方法在艺术和考古学领域中的发展趋势和重要成就。     

专利实例

电镀镍及镍合金两则９９５０１金属表面电镀非反光性镍发明了在金属基体表面电镀非反光性镍镀层的工艺。所使用的电解液有瓦特型、氨基磺酸盐型、磺酸盐型或氟硼酸盐型,并添加（Ａ）常规光亮剂和（Ｂ）乙烯氧化物的取代物（或非取代物）或丙烯氧化物的取代物（或非取代物）或乙烯氧化物和丙烯氧化物的加成产物,其浓度为５ｍｇ／Ｌ,用以产生非反光效应。镀液温度为４０～７５℃,镀液清澈透明,透过光无散射。该镀液可获得无反光性的镍镀层,重现性好。（德国专利）ＤＥ１９５４００１１（１９９８０９１０）９９５０２电镀镍钨合金…     

基于BIM技术的山区大跨径悬索桥设计研究

赤水河大桥是千米级跨度的山区悬索桥,其规模大、技术难度高,传统手段难以满足设计要求。本项目通过将BIM技术引入到悬索桥设计中,解决了悬索桥线路比选、地形地质设计、锚碇设计、索夹设计及结构出图等设计过程中的困难。同时,也对项目进行BIM技术拓展应用,如二次开发、VR技术、构件编码等。实践表明,BIM技术在本项目中的应用,能够切实解决悬索桥设计过程中的一些难题,提高设计质量、节约成本,对同类型项目具有一定的借鉴意义。     

分布式异构数据库中语义的表示和转换

如何屏蔽分布在不同站点上的异构数据库之间的差异,是实现多个数据库互访要解决的首要问题。本文提出了语义值的概念和用语义值来消除各异构数据库的语义差别,从而实现多个数据库互访的一种方法。     

Preparation,structure and properties of thermoplastic olefin nanocomposites containing functionalized carbon nanotubes

The morphology and properties of multiwalled carbon nanotube modified polypropylene (PP)/ethylene–octene copolymer blends were studied. Polypropylene chains are covalently grafted onto the surface of carbon nanotubes (CNTs) in order to improve their interaction with the polymer matrix. It is observed that functionalization of CNTs improves their dispersion and increases the interfacial bonding between CNTs and polymer matrix. The functionalized CNTs are selectively distributed in the continuous polypropylene phase. The size of the dispersed elastomer phase decreases after the addition of CNTs. Functionalized CNTs act as a nucleating agent and increase the crystallinity of the polypropylene. More importantly, an important increase in impact strength, stiffness and toughness can be achieved through introducing functionalized CNTs. Copyright © 2011 Society of Chemical Industry     

Enhanced interfacial adhesion via interfacial crystallization between sisal fiber and isotactic polypropylene: direct evidence from single‐fiber fragmentation testing

Bioresource natural sisal fiber (SF) was used to prepare single fiber‐reinforced isotactic polypropylene (iPP) composites. Three kinds of interfacial crystalline morphologies, spherulites, medium nuclei density transcrystallinity (MD‐TC) and high nuclei density transcrystallinity (HD‐TC), were obtained in the single fiber‐reinforced composites by implementing quiescent or dynamic shear‐enhanced crystallization and by modulating the compatibility interaction between SF and iPP. The development of interfacial shear strength (IFSS) during the interfacial crystallization process was demonstrated for the first time using a combination of single‐fiber fragmentation testing and optical microscope observation. A close correlation between IFSS and morphological characteristics of interfacial crystallization was well elucidated. The increases in IFSS were very different for spherulitic, MD‐TC and HD‐TC morphologies. The highest IFSS obtained was 28 MPa, after the formation of HD‐TC, which was about 62% of the tensile strength of neat iPP (45 MPa). These results offer powerful and direct evidence that interfacial crystallization could play an important role in the enhancement of interfacial adhesion of real SF/iPP composites. © 2013 Society of Chemical Industry     

Fluid-phase equilibria in binary systems containing an ionic liquid. Application of the Percus-Yevick-van der Waals equation of state

Following some simplifications to reduce the computational effort, the Percus-Yevick-van der Waals equation of state is used to calculate the isothermal total pressure of a binary liquid system containing one volatile nonelectrolyte liquid and one nonvolatile ionic liquid. Pure-component parameters a and b are found from pure-component enthalpy-of-vaporization and liquid-density data. The single binary parameter a₁₂ is obtained from Henry's constant for the nonelectrolyte in the ionic liquid. For 10 binary systems, calculated total pressures are in good agreement with experiment although in a few systems observed total pressures are slightly higher than those calculated in the region where the ionic liquid is dilute. Brief attention is given to a few binary systems with a miscibility gap.     

Hazardous effects of methane—air explosions in a mine roadway

This paper presents a methodology for estimating the hazardous effects of methane—air explosions by numerical simulation, theoretical analysis, and experiments.