二胺改性BPDA—ODA型聚酰亚胺的H2／N2分离性能

本文合成了一系列二胺改性的ＢＰＤＡ－ＯＤＡ型共聚酰亚胺膜，改性聚酰亚胺与未改性的ＢＰＤＡ－ＯＤＡ相比，透气性得到了明显的改善，改善的程度与第二种二胺单体的结构和用量有关。３０℃时，在ＢＰＤＡ－ＯＤＡ中加入２０ｍｏｌ％三甲基间苯二胺（３ＭＰＤＡ）或四甲基对苯二胺（４ＭＰＤＡ）时，共聚酰亚胺ＢＰＤＡ－ＯＤＡ／３ＭＰＤＡ（８０／２０）或ＢＰＤＡ－ＯＤＡ／４ＭＰＤＡ（８０／２０）的透Ｈ２系数和Ｈ２／Ｎ２分     

二胺改性BPDA－ODA型聚酰亚胺的H_2／N_2分离性能

本文合成了一系列二胺改性的ＢＰＤＡ－ＯＤＡ型共聚酰亚胺膜，改性聚酰亚胺与未改性的ＢＰＤＡ－ＯＤＡ相比，透气性得到了明显的改善，改善的程度与第二种二胺单体的结构和用量有关。３０℃时，在ＢＰＤＡ－ＯＤＡ中加入２０ｍｏｌ％三甲基间苯二胺（３ＭＰＤＡ）或四甲基对苯二胺（４ＭＰＤＡ）时，共聚酰亚胺ＢＰＤＡ－ＯＤＡ／３ＭＰＤＡ（８０／２０）或ＢＰＤＡ－ＯＤＡ／４ＭＰＤＡ（８０／２０）的透Ｈ２系数和Ｈ２／Ｎ２分离系数分别大于６．５ｂａｒｒｅｒ和１６０，是比较好的气体分离膜材料。     

杜比AC—3模式与杜比专业逻辑模式的区别（上）：兼谈THX标准

杜比ＡＣ－３模式与杜比专业逻辑模式的区别（上）──兼谈ＴＨＸ标准胡克杜比ＡＣ－３（ＤＯＬＢＹＳＵＲＲＯＵＮＤＡＯｄｉｏＣｏｄｉｎｇ－３）是最新的ＡＶ环绕声模式，也是今后环绕声系统发展的主流。时常有朋友问我：杜比ＡＣ－３模式与杜比逻辑模式的区别主要在哪...     

大容量无菌袋的生产与应用

大容量袋可分为两类，一类是桶中袋（ＢＡＧ－ＩＮ－ＤＲＵＭ），简称ＢＩＤ，将袋放入铁桶中灌装物品；另一类是箱中袋（ＢＡＧ－ＩＮ－ＢＯＸ），简称ＢＩＢ，袋中灌入物品后置于纸箱中。大容量袋主要用于饮料、糊状类食品、化工药品等的包装，容积为２～２４０升，特别...     

MgO—B2O3—SiO2—Al2O3—CaO中含硼组分析晶动力学

根据玻璃形成动力学理论，计算了ＭｇＯ－Ｂ２Ｏ３－ＳｉＯ２－Ａｌ２Ｏ３－ＣａＯ渣系中含硼组分２ＭｇＯ·Ｂ２Ｏ３的成核速度（Ｉ）和晶体长大速度（Ｕ），获得了２ＭｇＯ·Ｂ２Ｏ３晶体形成的最佳温度．采用化学分析、Ｘ射线衍射分析（ＸＲＤ）和差热分析（ＤＴＡ）等方法研究了热处理温度对ＭｇＯ—Ｂ２Ｏ３—ＳｉＯ２—Ａｌ２Ｏ３—ＣａＯ渣系硼提取率的影响．结果表明：硼渣最佳热处理温度与２ＭｇＯ·Ｂ２Ｏ３晶体形成最佳温度一致。     

利用单分子层气——液界面特性研究氯化二—（十八烷基）二甲铵的物理化学特性

在不同温度不同盐浓度的液－气界面上，测得了氯化二－（十八烷基）二甲铵（ＤＯＤＡＣ）的等温线，通过研究表面电势证实了静电斥力在电离的亲水集团之间起着重要的作用。特别是在气液固的过渡阶段这一作用尤为显著。凝聚态下ＤＯＤＡＣ分子所占面积约为０．５８ｎｍ＾２，与用Ｘ光衍射所得结果相符。当用Ｌ－Ｂ技术将ＤＯＤＡＣ单分子层镀到金属表面后，扫描电势仪显示薄膜非常相符。当Ｌ－Ｂ技术技术将ＤＯＤＡＣ单分子层镀到金属     

镍基合金上离子束辅助沉积双轴取向的YSZ膜—YBCO超导膜缓冲层

用双离子束辅助沉积（ＩｏｎＢｅａｍＡｓｉｓｔｅｄＤｅｐｏｓｉｔｉｏｎ，ＩＢＡＤ）方法在Ｎｉ－Ｃｒ合金上合成了具有（００ｌ）择优取向，平面双轴排列的ＹＳＺ膜（Ｙ２Ｏ３－ＺｒＯ２）作为ＹＢＣＯ超导膜缓冲层。辅助轰击离子束方向与衬底法线的夹角５４０左右时可获得最佳的（００ｌ）择优效果。８０００Ｃ高温退火后其结构有较大的改善。在其上用ＭＯＣＶＤ方法生长的ＹＢＣＯ膜的Ｔｃ＝８８Ｋ，Ｊｃ＝１０×１０４Ａ／ｃｍ２（０Ｔ，７７Ｋ），并且从Φ扫描的结果说明了ＹＳＺ缓冲层上ＹＢＣＯ膜的生长机制。     

芳香聚酰亚胺化学若干问题

本文以均酐－二苯醚二胺（ＰＭＤＡ－ＯＤＡ）体系为基础，对聚酰亚胺（ＰＩ）的母体聚酰胺酸（ＰＡ）的溶液聚合，及其以薄膜形式实现亚胺化转变为ＰＩ过程的若干重要化学问题和规律及与性能的关系，进行了系统介绍和讨论。     

文摘

文摘１３，５－二硝基苯甲酸与３，５－二硝基苯甲酸铝盐的分解热研究（英文）Ｃ９２３３１９０３ＲＥＤＤＹＧＯ，ＲＡＶＩＫＵＭＡＲＫＳ（ＩＤＬＣｈｅｍｉｃａｌｓＬｔｄ，Ｂａｎｇａｌｏｒｅ，ＩＮＤ）：Ｅ０３５０ＣＴｈｅｒｍｏｃｈｉｍＡｃｔａ（ＮＬＤ）１９８（...     

博士信箱

博士信箱问：请问ＯＮＥＢＣＤ－４９７和ＢＣＤ－７９７哪个更好？用Ｄ－２００推总成音箱是否适当？（沈阳市　张志智）答：ＢＣＤ－４９７采用的是ＳＯＮＹ的机芯，７９７是ＳＡＮＹＯ机芯，我认为４９７质量还是不错的。用Ｄ－２００推“惠威”没问题，但Ｄ－２００输...     

CAT系统创建中的需求分析

以基本的CAT( 计算机辅助公差设计D 系统为例 讨论了在建立系统整体架构过程中 进行面向对象的需求分析的基本内涵. 说明了需求分析的一般步骤~ 对象的分层结构和对象的类 并对各层对象进行了类化.     

Motion tracking system in video based on extensive feature set

In recent years, object detection and tracking has been a dynamic research area. Rapid development of the multimedia and the associated technologies urge the processing of a huge database of video clips. The processing efficiency lies on the search methodologies utilised in the video processing system. Usage of unsuitable search methodologies may make the processing system ineffective. Hence, effective object detection and tracking system is an essential criterion for searching relevant videos from a huge collection of videos. This paper proposes a unique object detection and tracking system where video segmentation, feature extraction, object detection and tracking are combined perfectly using various features. Initially, the database video clips are segmented into different shots before performing the feature extraction process. The proposed system consists of two stages, namely, feature extraction and tracking of object in the video clips. In the feature extraction stage, firstly, colour feature is extracted based on colour quantisation. Next, edge density feature is extracted for the objects present in the query video. Then, the texture feature is extracted based on LGXP technique. Finally, based on these feature extracted, the object will be detected and the detected objects will be tracked by utilising both forward and backward tracking technique. The proposed methodology proved to be more effective and accurate in object detection and tracking.     

基于形态变换的非刚体运动及变形的新方法及其应用

提出非刚体运动及变性的新方法,与传统的线性方法相比,解决了任意非同拓扑结构（包括有孔及凹多边形）的内插问题,理论上证明此种方法是一种全局优化的内插方法并证明此方法的正确性。实验表明此方法效果自然,质量好、速度快、自动化程度高,为字体合成、计算机动画、模型基编码、虚拟人机通信提供一个强有力的方法和工具。     

Directional Statistics of Preferential Orientations of Two Shapes in Their Aggregate and Its Application to Nanoparticle Aggregation

Nanoscientists have long conjectured that adjacent nanoparticles aggregate with one another in certain preferential directions during a chemical synthesis of nanoparticles, which is referred to the oriented attachment. For the study of the oriented attachment, the microscopy and nanoscience communities have used dynamic electron microscopy for direct observations of nanoparticle aggregation and have been so far relying on manual and qualitative analysis of the observations. We propose a statistical approach for studying the oriented attachment quantitatively with multiple aggregation examples in imagery observations. We abstract an aggregation by an event of two primary geometric objects merging into a secondary geometric object. We use a point set representation to describe the geometric features of the primary objects and the secondary object, and formulated the alignment of two point sets to one point set to estimate the orientation angles of the primary objects in the secondary object. The estimated angles are used as data to estimate the probability distribution of the orientation angles and test important hypotheses statistically. The proposed approach was applied for our motivating example, which demonstrated that nanoparticles of certain geometries have indeed preferential orientations in their aggregates.     

基于规则对象Petri网的柔性制造系统建模

针对FMS建模中存在的问题，通过分析FMS的组成和活动特点，提出了规则对象Petri网的建模方法。该方法集中了Petri网和面向对象技术的优点，并融系统决策规则子模型中。利用规则对象Petri网，建立了FMS的资源对象模型、动态行为模型和调度决策模型，为设计、分析和调度控制提供了有效的工具。     

3-D measurements using a video camera and a range finder

The geometric modeling of the environment can be carried out by incorporating a video camera range finder. When the quality of images is poor, the range finder, which is mounted on a site and azimuth rotation turret, brings an indispensable complement by measures of depth. The purpose of this paper is to build a geometric database of a three-dimensional (3-D) world in telerobotic applications. The calibration of the sensor system is presented by focusing on models of the range finder and methods we studied to determine them. The experimental results allow the evaluation of models and methods in terms of accuracy and stability. We show how the problem of setting up the 3-D geometric database can be solved by cooperation between human operator and sensors. Two cases are treated for database updating: determining the right position of known objects and inserting an embodying volume to model unknown objects, The experimental results concerning object modeling of cylindrical and polyhedral pattern and are given in terms of volume dimensions and position errors     

Data input model for virtual reality-aided facility layout

An approach to automatically extract three dimensional (3D) models (that is, geometries and topologies) of physical objects in a facility is described. The rationale for this work is its repeated use in efficiently developing databases of 3D objects for applying virtual reality (VR) tools in detailed layout decision support. Obtaining 3D object models can be a challenging task. Sometimes they are available, for example, in a Computer-Aided Design (CAD) database and these can be readily imported into a VR database. But on many occasions one is not so fortunate and these object models have to be created in correlation to an existing or proposed facility, which can be an extremely tedious and time consuming task. A time efficient and economical alternative is to use video camera images, but quickly and accurately capturing the depth information from 2D camera images has so far remained elusive because the existing methodologies are too general purpose and operate at a lower level of abstraction, namely digitized images. We have developed a method for directly inputting 3D objects into VR-aided facility layout models, by integrating the strengths of previously tried and tested technological components: (i) camera calibration; (ii) image processing; (iii) stereo vision; and (iv) Delaunay triangulation. The techniques described here are embedded in a prototype architecture and toolkit called MIRRORS (Methodology for Inputting Raw Recordings into 3D Object Renderings for Stereo). The primary contribution of this paper is that it has been able to design an integrated system to build 3D object models from 2D images. The MIRRORS system has been primarily designed for objects without free-form surfaces and whose shape can be recovered from a relatively nondense set of points.     

Managing object schemas in a distributed database architecture for concurrent engineering

Abstract

In recent years, object database systems have emerged as a new technology, integrating object‐oriented paradigms with transaction and query capabilities of conventional database systems. The strength of distributed object database systems is further enhanced by new generations of powerful workstations. The synergy between object databases and the networked workstation environment, however, brings forth a new set of challenges. In this paper, we address the issues of managing object schemas in a cooperative network environment. After reviewing existing solutions, we present a more dynamic approach to the problem of distributed schema management. We also show how this approach can serve as a general framework for supporting various schema management policies.     

面向协同虚拟制造的分布式支撑环境研究

提出了协同虚拟制造(collaborative virtual manufacturing, CVM)的概念及其主要内涵,比较了CVM与VM之间的联系与区别。作为VM的拓展和延伸,CVM可以被定义为基于网络技术、数据库技术和分布式计算技术,由制造商、供应商、合作伙伴和客户协同参与的支持供应链管理和个性化服务的虚拟制造。基于分层次、高度集成与松耦合的辩证统一和可扩展性的原则,给出了CVM体系结构,该体系结构同时考虑了供应链上企业之间的横向一体化和基于多层分布式对象技术的纵向一体化。分析了CVM与现有的分布式对象结构的主要矛盾,针对这一矛盾,提出了面向CVM的分布式支撑环境的主要技术内涵。给出了一个面向CVM分布式支撑环境的典型框架结构,该架构通过Web Service服务层整合异构分布式对象,并用传统的Socket通信方式以解决实时通信的问题。     

面向对象仿真建模的研究

本文主要从面向对象的建模和系统仿真建模两个方面对面向对象的系统仿真建模的一般过程进行了论述;使用该建模过程建立了飞控系统领域的系统建模仿真环境。