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。     

AHDCG全息图制作工艺及条件的研究

重铬酸盐明胶全息记录过程中工艺条件之间具有复杂的相依关系,而且与明胶干板的性质、周围的环境条件密切相关。本文对抗潮重铬酸铵明胶(简称AHDCG)全息记录材料在普通实验室作全息记录的各种工艺条件的合理选择进行了研究,并对工艺条件的优化及其机理进行了简要的探讨。     

双固化型全息用光致聚合物的研制及其全息性质研究

以环氧树脂为成膜树脂，甲基丙烯酸甲酯为光聚合活性单体，研制了一种双固化型全息用光致聚合物材料。通过成膜树脂配方的选取和光敏染料的选取优化了样片的配方组成，用457nm的蓝光在样片中记录全息光栅，用632．8nm的红光作为探针光，研究了样片的衍射效率、灵敏度、折射率调制度、预曝光量和收缩率等全息性能，测试结果表明单体的含量与组分的选取是影响样片衍射效率的主要因素，同时样片的制膜工艺对其全息性能也有很大的影响，通过配方的调整和制膜工艺的优化，部分样片的综合性能已基本达到实用化的需要。     

重铬酸盐明胶的全息记录特性

1.引言古老的感光材料——重铬酸盐明胶(DCG),在激光全息摄影迅速发展的今天又重新被人们所重视。DCG全息图所具有的高衍射效率、高信噪比、高分辨率等优良特性使其在显示全息、全息光学元件制作中成为一种重要的记录材料。但是由于明胶固有的亲水性,使干燥的重铬酸盐明胶全息图从高相对湿度(RH>80%)的空气中吸潮,导致全息图快速退化。这一致命弱点至今仍然是DCG作为全息记录的最大障碍。为了增强DCG全息图的抗潮性能,目前     

影像技术2004年总目次

页期页综述与发展银盐照相与数码照相从结构鉴定看照相有机物的发展激光打印机和复印机的核心部件———有机光导鼓OPC发展历程,制定技术及装备印刷制版版材现状和未来发展趋势遥感技术在上海湿地研究和保护中的贡献我国医学影像技术近十年发展概述热染料升华打印技术发展的现状和前景现代医学影像技术的网络化发展趋势记录层中含有微胶囊的直接感热记录材料国外主要影像材料公司来华申请专利最新动态技术开发与研究QSS—2901数字彩扩机底片扫描仪浅析PA接枝明胶在黑白全色照相胶片乳剂中的应用研究数字影像在印片质量评价中的应用关于…     

光致聚合物全息储存材料的研究

本文阐述了光致聚合物全息储存材料的组成、单体形成聚合物的反应机理、光致聚合物膜层形成全息图的机理;介绍了光致聚合物全息储存材料的国内外发展的现状,并详细分析了Du Pont公司和Polaroid公司材料的优点及其形成原因;讨论了光致聚合物全息储存材料的性能指标,并根据其材料的特点,提出有希望提高其性能的解决方案。由于光致聚合物全息储存材料的诸多优点,有望在下一代储存材料中脱颖而出。     

含双噻唑聚合物的合成与性能

以丁二酮、液溴和硫脲为原料合成了2,2-二氨基-4,4-联噻唑(DABT);将DABT与对氨基苯甲酸和多聚甲醛共聚制得对氨基苯甲酸缩聚DABT聚合物,然后与铁、镍、铜的硫酸盐配合得到金属配合物。表征了产物结构,测试了产物的热性能、电导率、磁性能和荧光特性。结果表明,对氨基苯甲酸缩聚DABT聚合物的电导率优于配合有金属离子的聚合物,其值为3.12×10-6S/cm,处于半导体范围;配合Fe2+的聚合物具有一定的磁性能,表明配合Fe2+聚合物是一种有机软铁磁体;而配合Cu2+的聚合物能激发产生荧光,具有发射紫外-蓝光特性,可作为新型有机光功能材料。     

关于提高卤化银全息记录材料分辨率的研究

本文总结了影响卤化银全息记录材料分辨率的一些主要因素:光晕和防光晕技术、光渗现象以及制作感光乳剂的工艺参数,如:明胶浓度、卤液复合组成、硝酸银液温度、乳化条件等。     

DCG全息研究进展

对重铬酸盐明胶全息的发展历史，成像机理，明胶对全息性能的影响，ＤＣＧ的增感和全息图的稳定性等作了全面综述，并对ＤＣＧ的性能改善了作了展望。     

有机改性光功能固态凝胶基质材料的制备与性能研究

用溶胶一凝胶（Sel－Gel）方法成功地制备了RhodamineB激光染料掺杂的有机无机复合硅钛凝胶玻璃,在二极管泵浦Nd：YAG激光器倍频光（532nm）作用下,得到了连续可调的激光输出．用IR、TG／DTA、光谱等手段分析了凝胶基质材料的热学、力学及光学等性能,实验发现,有机改性凝胶玻璃成胶以及机械加工、热学、力学及光学等性能均较好,是一种适于各类激光染料及非线性染料掺杂的理想固态基质材料．     

Insertion of triangulated surfaces into a meccano tetrahedral discretization by means of mesh refinement and optimization procedures

In this paper, we present a new method for inserting several triangulated surfaces into an existing tetrahedral mesh generated by the meccano method. The result is a conformal mesh where each inserted surface is approximated by a set of faces of the final tetrahedral mesh. First, the tetrahedral mesh is refined around the inserted surfaces to capture their geometric features. Second, each immersed surface is approximated by a set of faces from the tetrahedral mesh. Third, following a novel approach, the nodes of the approximated surfaces are mapped to the corresponding immersed surface. Fourth, we untangle and smooth the mesh by optimizing a regularized shape distortion measure for tetrahedral elements in which we move all the nodes of the mesh, restricting the movement of the edge and surface nodes along the corresponding entity they belong to. The refining process allows approximating the immersed surface for any initial meccano tetrahedral mesh. Moreover, the proposed projection method avoids computational expensive geometric projections. Finally, the applied simultaneous untangling and smoothing process delivers a high‐quality mesh and ensures that the immersed surfaces are interpolated. Several examples are presented to assess the properties of the proposed method.     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

Flow calorimeter for enthalpy increment measurements on condensed gases

A flow calorimeter for enthalpy increment measurements on condensed gases is presented. A better knowledge of the properties of the liquefied natural gas is needed, and therefore a liquid loop has been designed for our flow calorimeter. The fluid loop in the calorimeter is designed in order to avoid the two-phase region, since two phases would give compositional disturbances in the measurements. The avoidance of the two-phase region is made possible by increasing the pressure of the test fluid after the measurement section, then heating the fluid at super-critical pressure past the critical point. Finally, the fluid is throttled to the low-pressure gas state at the inlet condition of the compressor that circulates the fluid. To perform the pressure increase, a new cryogenic pump has been designed. To evaluate the new equipment, measurements were taken on liquid ethane over the temperature range 146–256 K at pressure between 0.9 and 5.1 MPa.     

Refrigerators Enter a New Era of Health Preservation Frestech initiates the establishment of China's first standard for household sterilization refrigerators

On November 30, 2007, the China Association for Standardization (CAS) held a press conference at Beijing Diaoyutai State Guest House. Leaders from the China Household Electric Appliance Research Institute, the China Household Electric Appliance Association, and the China Consumers' Association attended and made speeches.……     

Optimum-Simulation von Ernteprozessen

Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß.     

A study of centrifugal cast high boron high speed steel

In the present study a high‐boron high speed steel (HSS) roll material was designed. Many expensive alloy elements have been substituted by cheap boron alloy, and high‐boron high speed steel roll has been manufactured by centrifugal casting method. The microstructures, mechanical properties and wear resistance of centrifugal casting high‐boron high speed steel roll have been investigated by optical microscopy (OM), scanning electron microscopy (SEM), and X‐ray diffraction (XRD) analysis, hardness test, impact test and wear test. The results indicated that the solidification microstructures of high‐boron high speed steel roll consisted of M₂(B,C), (W,Mo)₂(B,C), M₃(B,C), M₂₃(B,C)₆ type borocarbides and martensite, a small amount of retained austenite. Borocarbides were continuously distributed over the grain boundary. After quenching from 1050 °C, local broken network appeared in partial borocarbides, and fine secondary borocarbide precipitated from the matrix. After tempering from 525 °C, the amount of precipitated borocarbide increased significantly. After heat treatment, the hardness of high‐boron high speed steel roll excelled 60 HRC, and its impact toughness excelled 8.0 J/cm². The single groove steel rolling amount of high‐boron high speed steel rolls increases by 500% than that of bainite cast iron roll, when the rolls are used in K₁ mill housing of bar mill.     

Thixotropy of Systems with Shear Thinning and Plastic Flow Behavior

The definition of the thixotropy is a decrease in viscosity with time in shear and a subsequent recovery of viscosity after the shear deformation is removed.We ...     

Brainstorming for ISO Strategy 2016-2020

正Responding to ISO’s appeal for survey for the to-be-developed ISO Strategy Plan for 2016-2020,SAC hosted a special workshop over the needs and comments of various fi elds on June 8 in Beijing.The workshop was attended by ISO President-elect and Ansteel General Manager Zhang Xiaogang,SAC Vice-Administrator Yu Xinli,and 30 experts from     

CNAS Passes APLAC's PTP Review

正The review group of Asia Pacific Laboratory Accreditation Cooperation(APLAC)carried out a 4-day peer review of the proficiency testing provider(PTP)for China National Accreditation Service for Conformity Assessment(CNAS)from July 28 to 31,2014.CNAS passed the PTP review with excellent performance.Two senior peer reviewers of APLAC made a comprehensive,rigorous and detailed review of CNAS’s PTP accreditation activities,and made the on-spot inspection of the review groups in Shanghai and Shenzhen respectively.