音像磁带库系统的多媒体数据模型设计

广播电视部门制作、存储了大量的录音资料、录像资料、影片、唱片等,随着人们对文化需求的日益增长,这些音像资料也成倍地增加,而其使用和交流的频度也成倍地增长。音像资料的制作设备复杂,费用也比文字资料昂贵得多,许多镜头和特殊音响是我国珍贵的文献资料。因此,有效地收集、整理、保存和利用音像资料资料,是广播影视界     

基于网络的视频资料信息管理系统的构建

从高校的实际需要出发,建立基于网络视频资料信息管理系统,,把视频资料信息统一存放在数据库内,对数字资料提供面向内容的管理,系统提供对视频资料的检索、浏览、借用等多种功能,方便教师和学生使用视频资料。     

基于元数据技术的DVB-S广播资料分发及文件名解析系统的实现

应用计算机元数据技术,实现了气象元数据的结构设计与各类气象数据的元数据表,在此基础上,实现了DVB-S多路资料分发、文件过滤功能及资料补传等功能;利用数据挖掘技术设计了基于文件名的资料分类方案,实现了通用的气象资料文件名解析及自动化入库,为用户使用资料、了解资料提供了平台。     

PDF海量收集打造专业电子论文

毕业写论文,需要找很多的资料,同学们都是上网找资料。网上的资料很多,但主要是PDF格式,如何将网上优秀资料占为己有呢?如何制作自己的电子论文呢?先来下载PDF资料,再将它变为自己的论文参考资料吧。     

无需积分巧下新浪共享资料

新浪共享资料里的资料非常丰富,虽然有的资料可以免积分下载,可不少都是需要登录网站后用积分下载的。如果不用积分,也不用网上的工具,有没有其他办法下载资料呢？打开想下载的资料页面,点击“用手机下载”链接,     

资料管理信息系统

资料管理系统开发包括后台数据库的建立和维护以及前端应用程序的开发两个方面。该软件的开发使用MICROSOFT公司的VISUAL BASIC6.0作为开发工具。资料管理系统可以为企事业单位提供大量资料保存,减少空间,信息查询、信息修改、信息存取等服务,基本上能够满足现代资料管理的需求。资料管理信息系统,使资料管理的信息管理工作系统化、规范化、自动化,鉴于办公的需要和管理,可达到提高资料管理效率的目的。     

气象资料省际共享监控系统

气象资料省际共享为预报预测以及气象服务提供了及时的周边省资料服务. 目前国家气象信息中心按月统计省际共享资料传输质量,不能及时发现资料收发异常. 参照上行传输监控方案,设计与实现了省际共享实时监控系统,将接收与发送的自动站文件解码得到的站级信息以及雷达基数据站级信息写入省际共享监控库. 通过Web展现国家级自动站正点资料、区域自动站正点资料和雷达基数据接收与发送情况. 基于数据库实现各省资料日、月和年统计分析,为资料应用部门和管理部门提供实时的省际资料传输情况. 系统自动生成省际共享日志并定时上报. 业务应用证明,该系统运行稳定可靠,体现了气象资料省际共享实时业务质量监控的优势.     

宁夏气象数据网设计与实现

首先分析了宁夏现用气象资料检索的弊端,之后根据宁夏资料存储与管理的特点,采用SQL Server、ASP.NET、Java Script、C#等技术,设计开发了基于B/S架构的宁夏气象数据网,用于改善传统气象资料检索的现状,通过多种资料检索方式,帮助资料共享和管理人员便捷、快速的获得所需气象资料。目前系统已投入业务试运行,运行良好,在气象资料服务方面起到良好作用。     

变电站资料管理的系统模型设计与研究

变电站资料具有繁多、内容复杂、更新频繁的特点,增加了变电站设计过程中使用参考资料的难度,和对历史资料存档的种种困难。针对目前变电站资料普遍采用手工方式管理资料的缺陷,根据变电站资料管理需求以及变电站设计流程的特点,设计与实现了变电站资料规范化、网络化和自动化管理的信息系统模型。系统采用B/S架构,主要实现了变电站电子资料的集中管理和远程维护,功能包括资料搜索查询、上传、下载、维护、版本控制、用户权限控制等,具有友好人机界面和简单易用、稳定可靠的性能。     

水文资料在线整编系统设计与应用

水文资料整编工作是水文工作中重要的一部分,传统水文资料整编工作存在数据整编过程复杂、费时费工、数据时效性差、数据成果应用性低等问题。以云南省水文资料在线整编系统设计与应用为案例,介绍水文资料在线整编系统的建设要点、特点及应用效果。通过建设水文资料在线整编系统,可提高水文资料整编效率,加强水文数据服务及时性,提升水文数据利用率,为其他地区水文资料整编工作提供新的思路。     

从茶具材质发展谈产品设计专业的材料教学

现今的产品设计材料教学,很大程度上仅仅局限在对材料本身的讲授,而没有把材料置于设计中,将材料的设计表现意义传达出来,这种对材料片面性的理解势必影响学生在设计中对材料的充分使用。本文就以茶具为例,透过茶具材质的发展来探讨材料对于设计的深层意义,并且提出在产品设计的材料教学中,应该在设计的大前提之下对材料知识进行全面的讲授与科学的分析。     

智能材料与工业设计

智能材料由于其特殊的材料特性,逐渐受到各国研究、设计人员的重视。本文着重阐述了智能材料的发展,智能材料的定义,以及对工业设计和设计师的影响,分析智能材料与工业设计的关系和相互作用,尝试寻找工业设计的新方向,以及工业设计师应对智能材料相关设计的方法与策略。     

Feature-based design for heterogeneous objects

Heterogeneous objects are objects composed of different constituent materials. In these objects, multiple desirable properties from different constituent materials can be synthesized into one part. In order to obtain mass applications of such heterogeneous objects, efficient and effective design methodologies for heterogeneous objects are crucial.In this paper, we present a feature based design methodology to facilitate heterogeneous object design. Under this methodology, designers design heterogeneous objects using high-level design components that have engineering significance. These high level components are form features and material features. In this paper, we first examine the relationships between form features and material features in heterogeneous objects. We then propose three synthesized material features in accordance with our examination of these features. Based on these proposed features, we develop a feature based design methodology for heterogeneous objects. Two enabling methods for this design methodology, material heterogeneity specification within each feature and combination of these material features, are developed. A physics (diffusion) based B-spline method is developed to (1) allow design intent of material variation be explicitly captured by boundary conditions, (2) ensure smooth material variation across the feature volume. A novel method, direct face neighborhood alteration, is developed to increase the efficiency of combining heterogeneous material features.Examples of using this feature based design methodology for heterogeneous object design, such as a prosthesis design, are presented.     

材料的感觉特性的研究与探讨

本文通过对材料质感印象的调查,探讨材料感觉特性量化的方法,并基于视觉和听觉案例、研究材料的感觉特性和人的生理与心理的关系,试图为产品造型设计的选材提供可靠的参考数据和评判的科学依据。使材料感觉特性的运用更加科学合理,拓宽设计思路,丰富和完善设计构思,给造型设计带来新的特点。     

Optimal design of periodic functionally graded composites with prescribed properties

The computational design of a composite where the properties of its constituents change gradually within a unit cell can be successfully achieved by means of a material design method that combines topology optimization with homogenization. This is an iterative numerical method, which leads to changes in the composite material unit cell until desired properties (or performance) are obtained. Such method has been applied to several types of materials in the last few years. In this work, the objective is to extend the material design method to obtain functionally graded material architectures, i.e. materials that are graded at the local level (e.g. microstructural level). Consistent with this goal, a continuum distribution of the design variable inside the finite element domain is considered to represent a fully continuous material variation during the design process. Thus the topology optimization naturally leads to a smoothly graded material system. To illustrate the theoretical and numerical approaches, numerical examples are provided. The homogenization method is verified by considering one-dimensional material gradation profiles for which analytical solutions for the effective elastic properties are available. The verification of the homogenization method is extended to two dimensions considering a trigonometric material gradation, and a material variation with discontinuous derivatives. These are also used as benchmark examples to verify the optimization method for functionally graded material cell design. Finally the influence of material gradation on extreme materials is investigated, which includes materials with near-zero shear modulus, and materials with negative Poisson’s ratio.     

Design of heterogeneous turbine blade

Constantly rising operating pressure and temperature in turbine drivers push the material capabilities of turbine blades to the limit. The recent development of heterogeneous objects by layered manufacturing offers new potentials for the turbine blades. In heterogeneous turbine blades, multiple materials can be synthesized to provide better properties than any single material. A critical task of such synthesis in turbine blade design is an effective design method that allows a designer to design geometry and material composition simultaneously.This paper presents a new approach for turbine blade design, which ties B-spline representation of a turbine blade to a physics (diffusion) process. In this approach, designers can control both geometry and material composition. Meanwhile, material properties are directly conceivable to the designers during the design process. The designer's role is enhanced from merely interpreting the optimization result to explicitly controlling both material composition and geometry according to the acquired experience (material property constraints).The mathematical formulation of the approach includes three steps: using B-spline to represent the turbine blade, using diffusion equation to generate material composition variation, using finite element method to solve the constrained diffusion equation. The implementation and examples are presented to validate the effectiveness of this approach for heterogeneous turbine blade design.     

Multi-material structural topology optimization with decision making of stiffness design criteria

A new methodology for making design decisions of structures using multi-material optimum topology information is presented. Multi-material analysis contributes significant applications to enhance the bearing capacity and performance of structures. A method that chooses an appropriate material combination satisfying design stiffness requirement economically is currently needed. An alternative method of making design-decision is to utilize a multi-material topology optimization (MMTO) approach. This study provides a new computational design optimization procedure as a guideline to find the optimal multi-material design by considering structure strain energy and material cost. The MMTO problem is analyzed using an alternative active-phase approach. The procedure consists of three design steps. First, steel grid configurations and composite with material properties are defined as a given structure for automatic design decision-making (DDM). And then design criteria of the steel composites structure is given to be limited strain energy by designers and engineers. Second, topology changes in the automatic distribution of multi-steel materials combination and volume control of each material during optimization procedures are achieved and at the same time, their converged minimal strain energy is produced for each material combination. And third, the strain energy and material cost which is computed based on the material ratio in the combinations are used as design decision parameters. A study in constructional steel composites to produce optimal and economical multi-material designs demonstrates the efficiency of the present DDM methodology.     

首饰材料多样化实践之陶瓷首饰

如今,在首饰设计中,传统的天然贵金属材质和宝石材质已经逐步不能够满足设计师的设计思想,理念和设计作品的表达,本文通过分享和描述作者在陶瓷首饰方面的制作经历和设计经验,以期为首饰材质多样化发展和首饰材质多样化选择方面提供一些思路。     

Application of an energy-based model for the optimal design of structural materials and topology

This paper describes an implementation of recent developments in modelling for the design of continuum structures into a general program for computational solution of such problems. In the basic model, the unrestricted material tensor appears as the design variable. The algorithm for this program is presented and the method of solution is described. The approach is applicable to predict both the optimal unrestricted material design and as well for design with a specified material. In either case, the distributions (fields) of all designable components of the material tensor are predicted. Results are given for 2D and 3D examples, in the form of continuously varying material properties and for various values of volume fraction. The associated zero-one or topology designs are obtained by application of an additional procedure to these results. Comparison against results from earlier approaches indicates that optimization of the material may lead to considerable improvement in structural performance.     

自适应配料控制系统在水泥磨料过程中的应用

本文就自适应配料控制算法在水泥磨料中的应用作了详尽的介绍,并对自适应配料控制系统的控制前景、方案设计、系统设计、预测思想等一并作了说明。