Design and optimization of zirconia functional surfaces for dental implants applications

Zirconia is becoming a promising solution for biomedical applications, namely for dental implants, due to its biocompatibility, and mechanical and aesthetical properties. Despite the constant developments in the dentistry field, strategies to promote an effective vascularization at the implant's surface and consequently improved osseointegration are still not enough.In this sense, with the aim of promoting the vascularization at the implant's surface, zirconia surfaces with micro-channels were designed and evaluated regarding their hydrophilicity and capillarity. A CAD/CAM system was used to design and produce the specimens and different techniques were used to characterize the surfaces. The obtained average surface roughnesses are in accordance with the literature for similar materials. Results revealed that the produced materials present high levels of hydrophilicity, whether in contact with water or FBS - Fetal Bovine Serum. Additionally, micro-channels with 200 μm of width and 100 μm of depth were the ones that presented higher capillarity, thus being promising solutions for the promotion of implants vascularization, and consequently improved osseointegration.     

液压接头的CAD/CAM/CNC设计与制造

液压接头是运动机械的一个重要组成部分,利用CAD/CAM/CNC技术实现接头的模块化设计和快速制造是保证其质量和加工效率的有效途径。对基于CAD/CAM/CNC的液压接头设计与制造进行了较全面地研究,实现了液压接头的计算机辅助设计(CAD)和计算机辅助制造(CAM)。     

CAD/CAM网站中动态页面的设计

介绍了CAD CAM网站中动态页面的设计。为了实现用户与网站的交互功能 ,在词汇查询与问题讨论部分采用ASP技术 ,使本站能够根据用户的需求在数据库中调取相关数据 ,动态生成页面。     

面向对象技术与CAD/CAM系统设计

面向对象的编程技术与传统的编程方法完全不同 ,它把现实世界的问题抽象为“类”的概念 ,而解决问题的过程就是完成对类所生成对象的一系列操作。比起传统方法 ,面向对象编程使得用计算机系统解决问题更趋于自然化 ,因为实际应用中的概念直接以“类”的形式存在于计算机中 ,这样易于被理解     

玻璃钢缠绕制品CAD/CAM系统

玻璃钢(FRP)缠绕(FW)制品具有比强度高，比刚度大等良好的性能，广泛应用于石油、化工、航空、航天等行业。玻璃钢缠绕制品CAD／CAM系统是一个FRP FW制品设计与生产的集成系统，它实现了FRP FW制品从原材料选择到最终控制缠绕机生产的全过程的一体化，大大提高了FRP FW新产品的质量和开发效率。本文介绍了系统的基本功能和结构。     

I-DEAS后置处理技术的应用

以Mikron数控机床的Heidenhain控制系统为例,I-DEAS后置处理由INIT、START、TERMINATE三个程序段组成.通过DEAS CAM后置处理器输入刀位、机床配置、后置处理程序等信息,可得到机床NC加工程序的输出.其后置处理程序分初始化段、起始段、共用段、主轴段、直线插补段、平面圆弧插补段及结束段七部分.     

CAD/CAM实现对圆柱直齿轮的模拟数控加工

目前CAD/CAM在制造业中得当了广泛的应用,文章介绍了利用CAXA软件实现CAD/CAM的数控加工过程.选择了常用的圆柱直齿轮作为研究对象,建立模型、求出加工轨迹并实现仿真的具体方法.     

实用主义代码70后中国建筑师之建筑数字观

文章指出,70后中国建筑师站在计算机带来的新技术变迁的时代前沿从电脑普及化到电脑计算化,首当其冲受到技术革命带来的设计方法和过程改变的洗礼,从而对数字设计具有敏锐触觉。70后受到的教育延续布扎体系,深悉建筑本质：几何形态、空间、质感,光线和建构。＂建房子＂的迫切需求让70后的数字时代的建筑观具有强烈实用主义的特征,这样的特征给在中国建筑实践和教育中崛起的70后带来了产生新建筑形态语言和思潮可能的机会。     

Further investigation on the modified hyperbolic function in the CAM16 color appearance model

In the International Commission on Illumination (CIE) color appearance model CIECAM02, a modified hyperbolic function is used to represent luminance adaptation. The same nonlinear function is also used in the new color appearance model CAM16 [Color Res Appl., 2017;42:703‐718]. Although the modified hyperbolic function seems reasonable based on physiological evidence, it has an infinite slope at the origin, which causes instability for both the forward and inverse modes of the CIECAM02/CAM16 models. In this article, various possible extensions to the nonlinear luminance adaptation function in CIECAM02/CAM16 are reviewed and evaluated. Based on these investigations, the Gill extension to the hyperbolic function that is used to represent luminance adaptation [Proceedings of 16th Color and Imaging Conference, pp. 327‐331, 2008], is recommended at both the lower end (q < q_L ) and the upper end (q > q_U ), where q is the appropriate R_c , G_c , B_c (or R_wc , G_wc , B_wc ) response. In addition, the new recommended function can be readily inverted for use in the appropriate inverse appearance model. From an extensive analysis using available experimental data sets, we also propose that, for the lower and upper limits of the luminance range in the extended model, the values q_L = 0.26 and q_U = 150 be used, respectively.     

CAX技术及其集成研究综述

在对现有CAX技术及其集成技术进行研究的基础上,首先介绍了各种CAX技术的概念、工作过程、应用现状和主要应用软件等,并分析了CAX集成技术的框架和工作流程,最后探讨了CAX技术及其集成的发展方向。