基于无向图的胶印机输墨系统研究

基于无向图理论,将胶印机输墨系统视为一个复杂的无向图,建立了输墨系统的网络关系图,并采用邻接多重表进行存储.在此基础上,通过将墨辊表面离散化和动态创建二维数组记录墨辊表面墨层厚度变化的方法,更加真实直观地再现了油墨在印刷过程中的传递过程.     

分布式本体库存储模型的设计与优化

针对如何高效地构建用于语义交互的分布式本体库展开了研究。首先,分析了基于本体的语义交互平台的通用体系结构,进而明确分布式本体库在平台中的作用,提出了一种分布式本体库存储模型。围绕该模型,详细讨论了网络本体库与本地本体库的映射方法,语义数据的编码方法,然后详细分析了该模型中指令分发和数据演化组件的工作机制,最后通过实验验证了:在集群存储模式下,对于大数据量查询,网络数据传输对查询时间开销的影响远远小于查询本身,从而为分布式本体库存储效率的优化奠定了基础,即在本体库中采用分布式集群存储可以达到优化检索效率的目的。该存储模型已经在STASIS平台中得到应用。     

基于网络表示学习的本体语义挖掘与功能语义检索方法

为充分利用本体概念之间隐含的语义关系,以支持产品功能创新设计过程,提出了一种基于网络表示学习的本体语义挖掘与功能语义检索方法。首先,基于本体中确定的语义关系,利用网络表示学习挖掘隐含的语义关系;然后,基于语义类比的向量运算,建立本体概念之间潜在的功能语义关系,并对功能语义向量进行表达;最后,通过功能语义向量的相似度计算实现由用户功能需求向跨领域功能性设计资料的扩展,并建立相应的设计资料检索方法和流程。产品设计示例表明,所提出的本体语义挖掘与功能语义检索方法有利于从产品功能角度获取跨领域设计知识,可为设计人员提供更多的灵感。     

基于模块化设计的混合图拆卸建模研究

拆卸建模是拆卸序列规划的基础,也是绿色设计的关键。在传统的拆卸序列规划过程中,随着产品零件数目的增加会造成“组合爆炸”问题。为解决该问题,提出了一种基于模块化设计思想的拆卸建模方法。首先,运用图论中有向图和无向图的概念分别表示零、部件之间的约束关系,并将有向图和无向图结合成混合图,建立产品混合图拆卸模型;其次,利用模块化设计中的模块划分原则生成子装配体,通过将模块化设计方法整合入混合图模型中,得到模块化设计的混合图拆卸模型,利用该模型可以有效地解决图论模型中边与顶点产生“组合爆炸”的问题;最后,以模块化设计的计算机主机箱的混合图拆卸建模为例来验证所提出的方法。     

基于语义的翻译记忆系统的设计

在翻译记忆系统中,句子的语义理解是关键.提出一种基于本体的英汉翻译记忆系统设计思想,分析本体在翻译记忆中的优势,利用本体的语义信息能提高翻译的准确性.     

协同虚拟维修中的零件特征模型

协同维修中大型装备零件多、关系复杂。针对协同虚拟维修中零件信息如何组织和共享等问题,文章分析协同维修过程所需的信息,采用面向对象的建模思想,构建了包含拆装序列、拆装运动约束、人员角色和维修工具等特征信息的零件特征模型,并将其映射成关系数据类型,存储在数据库中。最后,实例验证了模型能够把零件中有关维修的信息很好的组织起来,解决了零件信息异地用户共享问题。     

Drools规则引擎在钣金检验特征识别中的应用

针对钣金零件的CATIA设计数模,利用其二次开发软件CAA,提取了CATIA特征树中的钣金零件综合信息．重点采用Drools规则引擎从复杂的特征树中提取待检测钣金零件的特征,并将特征信息存储到数据库中．     

基于自动提取局部本体的业务协作集成方法

针对异构系统间进行基于语义的业务协作时由人工构建局部本体较为困难的问题,利用本体技术研究了正常业务的协作集成,提出了一种从数据库中提取局部本体的方法,实现了局部本体的快速、高效的构建;提出了一种针对所提取出的局部本体同领域本体之间进行相似度计算的算法,解决了异构系统之间的语义映射问题;提出了一种基于自动提取局部本体的业...     

基于本体论的工艺信息描述方法研究

依据本体论的概念论述了零件信息和制造资源信息的描述方法，给出了它们本体的定义方式。描述了零件本体和特征本体的属性，分析了各本体间和本体属性间的关系。以开发的CAPP系统为例，阐述了此描述方法在实际应用中体现出的特点。     

三维CAD数据存储技术研究

基于三维CAD应用中复杂数据结构和其它信息的研究,提出了数据库应用程序接口系统层次化的体系结构和数据储存驱动的概念,并定义了三种持久数据模式的类型,来建立零件和装配件之间的关系模式,通过这种方法可以有效地存储和读取CAD应用数据,保持数据的一致性和连续性。     

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 ...     

Effect of Oxide Assisted Metal Nanoparticles on Microstructure and Morphology of Gallium oxide Nanowires

Several researches have been reported about the characteristic of β-Ga2O3 nanowires which was synthesized on nickel oxide particle. But indeed, recent researches about synthesis of β-Ga2O3 nanowires on oxide-assisted transition metal are limited to nickel or cobalt oxide catalyst. In this work, Gallium oxide (β-Ga2O3 ) nanowires were synthesized by a simple thermal evaporation method from gallium powder in the range of 700 - 1000℃ using the iron, nickel, copper, cobalt and zinc oxide as a catalyst, respectively. The β-Ga2O3 nanowires with single crystalline without defects were successfully synthesized at the reaction temperature of 850, 900 and 950℃ in all the catalysts. But optimum experimental condition in synthesis of nanowires varied with the kind of catalyst. As increasing synthesis temperature,the morphology of gallium oxide nanowires changed from nanowires to nanorods, and its diameter increased. From these results, we could be proposed that the growth mechanism of β-Ga2O3 nanowires was changed with synthesis temperature of nanowires. Microstructure and morphology of Synthesized nanowire was characterized by HR-TEM, FE-SEM, EDX and XRD.     

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