以BMA-MA共聚物为成膜树脂的光致聚合物材料的全息性能

采用溶液聚合法合成了水溶性的甲基丙烯酸丁酯-甲基丙烯酸(BMA-MA)共聚物,以这种共聚物为成膜树脂制备了光致聚合物全息材料,研究了光致聚合物全息材料的光敏性、衍射效率、空间频率响应、折射率调制度、曝光能量常数等全息性能。结果表明,在记录信号空间频率为1580 cy/mm时,以BMA-MA共聚物为成膜树脂的光致聚合物全息材料的灵敏度可达15 mJ/cm2,最大衍射效率为92.8%,曝光能量常量为10.9 mJ/cm2,衍射效率随所记录信号空间频率的增加而降低,材料的最大折射率调制度为2.85×10-3,是一种具有一定应用前景的光致聚合物全息材料。     

对绿光敏感的全息存储光致聚合物性能的研究

报道了一种对绿光敏感的以丙烯酰胺为单体的光致聚合物，该光聚物由单体、光引发剂、共引发剂和成膜物组成。可以得到材料的最大衍射效率为55％。将光聚物用不同温度进行烘烤加热，可以看到材料的折射率调制度会增加。使用角度复用技术在光聚物中存储10幅全息图，说明所研究材料有希望于大容量体全息存储。     

全息涂料用丙烯酸树脂的合成工艺研究

研究探讨了一种适用于全息图文模压复制涂料的丙烯酸树脂的合成工艺.通过讨论单体配比、合成温度、聚合时间以及引发剂的类型和用量对树脂性能的影响;对丙烯酸树脂合成工艺条件进行了优化:当单体MMA∶MBA∶BA∶MAA组成比为60∶30∶5∶5,反应温度为120～126℃,聚合反应时间为5h,引发剂偶氮二异丁腈的用量为单体质量的1.5%时,所得的树脂固含量为49.9%,粘度为5690mPa·s,涂膜铅笔硬度为1H,光泽度高达90.5Gs,适合制备纸张全息图文模压复制涂料.     

纸基全息印品图文质量的影响因素分析

介绍了纸基全息印品的生产工艺流程,分析了全息涂料的单体组成对涂膜性能的影响,讨论了激光全息图文质量的光学特性指标--衍射效率和信噪比,着重阐述了模压温度、纸张表面光泽度和背景颜色对衍射效率的影响.     

一种新型绿敏光致聚合物及全息特性研究

报道了一种新型的对绿光敏感的光致聚合物材料,对环境湿度不敏感,材料的干燥时间短。该材料以丙烯酰胺为单体,N-苯基甘氨酸作为引发剂,藻红B作为光敏剂,并加入成膜剂聚乙烯醇及增塑剂二甲亚砜。对材料中光引发剂、光敏剂及增塑剂浓度进行了优化,发现其有一个最佳值。本材料记录的全息图衍射效率可达50％以上,感光强度为60mJ／cm^2。在光聚物介质上能够记录信噪比比较高的图像,说明该材料可用于全息存储。     

数码激光全息技术

一、数码激光立体(全息)照排系统数码激光全息(DigitalHolography)技术是通过计算机程序控制、全智能化设计和制作动态激光全息图像与文字的高新技术,用数码激光全息图像技术形成的“数码激光立体(全息)照排系统”是光、机、电和计算机技术的高度集成。在计算机技术、激光全息技术、数字图像处理技术、精密光学控制技术、衍射光学制造技术和工艺发展的基础上,激光无油墨印刷技术有了突破性的发展,产生了激光防伪包装印刷这一新技术,在包装、印刷和防伪行业有了巨大的发展空间。数码激光图像技术的核心是数码激光图像的生成、处理、控制和制…     

铬胶全息干板及其在全息领域中的应用

重铬酸盐明胶(简称铬胶)作为全息记录介质,具有高衍射效率、高分辨率(6000线/毫米)、高信噪比和低噪音等特性。最近十几年来广泛引起人们的注意。铬胶全息干板不仅可以用于氦镉激光(441nm)、氩激光(488nm,514nm),而且经过光谱增感后,还可以用于氦氖激光(633nm)。用铬胶全息干板可以制做光栅、光学透镜、滤波器等多种全息光学元件,而且体小质轻、形状可变,在空间技术、军事领域特别受到重视。本文介绍了铬胶作为全息记录介质在国外的发展情况;铬胶全息干板的全息特性、制做、处理程序以及影响因素,此外还介绍了铬胶全息干板在全息领域中的各种应用。     

一种基于聚乙烯醇/丙烯酸-2-羟基乙酯的新型全息存储材料

本文研究了一种基于聚乙烯醇/丙烯酸-2-羟基乙酯的新型全息存储材料;研究了不同浓度的丙烯酸-2-羟基乙酯对光聚物材料衍射效率的影响;在厚度为95μm的光聚物薄膜中当曝光能量为231mJ/cm2时获得了近75%的高衍射效率。应用Matlab软件以光化学漂白理论、角度响应曲线理论为拟合模型,进行了基于Levenberg-Marquardt算法的非线性曲线拟合;通过非线性曲线拟合研究了不同浓度的丙烯酸-2-羟基乙酯对摩尔吸收系数、量子产率、折射率调制度、光聚物薄膜厚度等多个全息参数的影响;实验表明,丙烯酸-2-羟基乙酯的加入可有效增加光聚物薄膜的厚度并且改善光聚物薄膜的结构和性能,达到提升聚乙烯醇/丙烯酰胺光聚物初始材料的全息特性,改进光聚物材料全息光学数据存储容量的目地。     

含氟有机减反射膜的研究

采用低温等离子体辉光放电技术,用含氟有机单体在硅太阳电池表面聚合成膜。测定膜的光电性能和反射率证实:有膜电池的短路电流、光电转换效率及光谱响应都有明显增加,反射率绝对值降低2％左右,膜为非晶结构。此外,还研究了成膜工艺因素和膜电池性能的关系。     

巯基-双键点击反应制备光固化红光转光膜及其性能

本研究将不同含量的稀土转光剂与含巯基和双键单体共混制备了光固化树脂,然后经巯基-双键或双键-双键点击反应制备了两种农用转光膜,通过荧光光谱、UV光谱、SEM、拉伸性能测试等对转光膜的结构与性能进行表征。研究结果表明,添加0.5%(质量分数)稀土转光剂的转光膜能将波长为353 nm的紫外光转换为波长为613 nm和617 nm的红光,且该转光膜具有良好的透光性能和力学性能,拉伸强度达到12.72 MPa,在农业大棚、玻璃温室等方面具有良好的应用前景。     

The Research of Anti-Wear Properties of Organomolybdenum Compounds in the Engine Oils

A four-ball tester was used to evaluate the anti-wear performance of three kinds of organomolybdemun compounds in the engine oils, i. e., molybdenum dialkyldithiophosphate (MoDDP), molybdenum dialkyldithiocarbamate ( MoDTC), and sulphur and phosphorus freeorganomolybdeum (Molybdate). The results indicate that a low concentration of MoDDP doesn' t improve the anti-wear properties of the commercial engine oils, but a high concentration of MoDDP can obviously improve the anti-wear properties and the load-carrying capacity of the engine oils. MoDTC doesn' t improve the antiwear properties of the engine oils, but worsens the anti-wear properties of the oils. Signifi can timprove ment of frictional and wear characteristics is obtained with Molybdate added in the commercial engine oils and the formulated oils.     

Certification Becomes Important for the I Quality; and Safety Supervision of the Chinese Liquor Sector

The end of 2007, over 200 unit products of more than 80 Chinese firms have passed the quality grade certification for liquor products. These products involve distilled spirits, beer, wine, yellow wine, fruit syrup wine and others, and cover over 80% of the national top-branded liquor products.……     

Deposition and Coating Properties on CVD Tungsten

Surface characterization and microstructure studies are performed on chemical vapor deposited (CVD) tungsten coating. There is about 2 μm thickness diffusion layer of tungsten in the molybdenum substrate. The thermal shock test shows tungsten coating has good adhesion with molybdenum substrate, but the elements of oxygen and carbon in the tungsten coating have the bad affection to the adhesion. The result of high-temperature diffusion experiment is the diffusion rate from molybdenum substrate to tungsten coating is faster.     

Analysis of marine hydrobiont lipid extracts as possible cryoprotective agents

We studied a combined effect of the cryoprotectants both of lipid and carbohydrate origin at the presence of DMSO or without it on cell viability and the RNA synthesis in the embryonic mollusc and echinoderm cell cultures obtained at different developmental stages. Cryoprotective properties of exogenous lipids correlated with their thermotropic behavior. Lipid extracts from marine hydrobiontes, which thermal transitions are characterized by relatively small part of calorimetric thermogram area lying at temperatures above 0 °C (6–18%), were found to possess a considerable cryoprotective activity. The results are discussed in relation to the prediction of the cryoprotective activity of lipid extracts for marine animal cells. In addition, it was found that marine invertebrate cells can be cryopreserved without DMSO at the presence of trehalose and lipid extracts of some marine hydrobiontes.     

Low-Temperature Properties of Silver

Pure silver is used extensively in the preparation of high-temperature superconductor wires, tapes, films, and other configurations in which the silver not only shields the superconducting material from the surrounding materials, but also provides a degree of flexibility and strain relief, as well as stabilization and low-resistance electrical contact. Silver is relatively expensive, but at this stage of superconductor development, its unique combination of properties seems to offer the only reasonable means of achieving usable lengths of conductor. In this role, the low-temperature physical (electrical, thermal, magnetic, optical) and mechanical properties of the silver all become important. Here we present a collection of properties data extracted from the cryogenic literature and, to the extent possible, selected for reliability.     

Early ironwork in Biscay: Survey,excavation, experimentation and materials characterization. An integral study of the mountainside ironworks (ferrerías de monte or “haizeolak”)

ABSTRACT

The production of iron in Biscay (Basque Country, Spain) has been a hallmark of this territory of the North of the Iberian Peninsula throughout its history. The Archaeology team of the Basque Country Mining Museum has spent 13 years, so far, studying the origins of this activity through the evidences left at the old pre-hydraulic iron production workshops known as mountainside ironworks (ferrerías de monte) or haizeolak. It has catalogued 170 archaeometallurgical sites of this type in Biscay, and the archeological excavation of some of them has led to the knowledge of the different stages of the production process that took place in these workshops. The team has also experimentally reproduced the work carried out in a mountainside ironworks from the High Middle Ages, and it has currently started the characterization process of this type of activity through the study of the collected materials.     

Mechanism Study on the Wear of CrAlTiN Coated High-Speed Steel Twist Drills Under Dry Cutting Conditions

As demands about environment protection are growing up, dry cutting technology is getting more and more concerns from all over the world. Main works performed here are study on dry cutting performances and wear mechanisms of M2high-speed steel (HSS) twist drills with CrAlTiN multicomponent coatings, which was deposited using magnetron sputter ion plating system, in drilling 45 and 30CrMnSiA steel, and their comparisons to those in drilling the same steel but using monolayer CrN and commercial TiN coated drills. Drilling performances of drills are evaluated mainly through the measurements of width on outer corner flank land and the cutting forces. Results show that performances of CrAlTiN coated drills are better than those of monolayer CrN and TiN coated drills. In drilling 45 and 30CrMnSiA steel, the average tool life of the CrAlTiN coated drills are 17.2 and 11.8 times higher than those of the uncoated drills. Observing wear of the drill with scanning electronic microscope, results show that there is no crack or spallation of the CrAlTiN coatings in wear zones. Main mechanism of the wear here is adhesion.     

Study on Bond Ability of Arc-Spraying Coatings with Different Surface Pretreatment on Cast-Iron

Arc spraying coatings are widely used in various applications, but uncommon in cast iron substrate. Different surface pretreatment technology is tested on substrates of gray cast iron. Surface roughness and residual stress were measured by TR200 and X-ray diffraction analyzer. Influence of different surface pretreatment methods ( dry blasting and fusebond) on roughness and residual stress was analyzed. The arc-sprayed coatings of wire 3Cr13 (φ2mm) on gray cast iron substrate is studied. The microstructure and interface of bonding layer were observed by SEM. The bond strength was taken by tensile test. Results show that bond strength with grit blasting is higher than fuse-bond; it is feasible to make wire 3Cr13 coating with arc spraying on cast iron substrate roughened by grit blasting.     

Structural Characteristics of TiO2 Ceramic Coating by Micro-Plasma Oxidation

TiO2 ceramic coatings with thickness of 20 μm were formed on the surface of pure titanium by micro-plasma oxidation. Their micro-structures were investigated by by using X-ray diffraction and their surface images were detected by using scan electronic microscope. There were three kinds of TiO2 coatings, pure anatase type TiO2 phase, mixed phases consisted of rutile type TiO2 phase and anatase type TiO2 phase, pure rutile type TiO2 phase. The coating surface with the pure anatase type TiO2 phase is rough, while the coating surface with the pure rutile type TiO2phase is smooth. The upper coating surface with the mixed type TiO2 phases is anatase type TiO2 structure and the subsurface of the TiO2 coating is rutile type TiO2structure.     

Evaluation of fatigue life of steel using steel grain size

The insightful discussion of the relationship between the construction of metallographic and fatigue life and proposition of mathematical relationships describing this relationship was conducted in the paper. This paper presents a method for estimating the fatigue life, based on the construction of the microstructural material taking into account the grain size and the participation of ferrite and pearlite phase.