论金属装饰艺术的传承与发展

中国金属工艺历史悠久,影响深远,拥有非常精湛的工艺技术。在其漫长的发展历程中,产生过大量具有鲜明特色的装饰形式和作品,具有极高的历史和艺术价值。我国现代金属装饰艺术不仅要继承和学习古代金属装饰艺术中精湛的工艺技术,同时还应继承其设计理念和设计文化,发展和提高现代工业技术在金属装饰艺术中的应用水平,始终与现代科学技术和社会生活保持紧密结合。     

GAJA： 3D CAD methodology for developing a parametric system for the automatic （re）modeling of the cutting components of compound washer dies

For the designing of cutting-dies is a complex and experience-based process, it is poorly supported by conventional 3D CAD software. Thus, the majority of design activities, including the (re)modeling of those cutting die-components that are directly responsible for performing shaping operations on a sheet-metal stamping part, traditionally still need to be carried-out repetitively, separately, and manually by the designer. To eliminate some of these drawbacks and upgrade the capabilities of conventional 3D CAD software, this paper proposes a new methodology for the development of a parametric system capable of automatically performing a (re)modeling process of compound washer dies’ cutting-components. The presented methodology integrates CATIA V5 built-in modules, including Part Design, Assembly Design and Knowledge Advisor, publication mechanism, and compound cutting die-design knowledge. The system developed by this methodology represents an ‘intelligent’ assembly template composed of two modules GAJA1 and GAJA2, respectively. GAJA1 is responsible for the direct input of the die-design problem regarding the shape, dimensions and material of the stamping part, its extraction in the form of geometric features, and the transferring of relevant design parameters and features to the module GAJA2. GAJA2 interprets the current values for the input parameters and automatically performs the modeling process of cutting die-components, using die-design knowledge and the company’s internal design and manufacturing standards. Experimental results show that this system significantly shortens the modeling-time for cutting the die-components, improves the modeling-quality, and enables the training of inexperienced designers.     

Real-time monitoring of indoor air corrosivity in cultural heritage institutions with metallic electrical resistance sensors

Abstract

A system for continuous monitoring of atmospheric corrosivity has been developed. An electronic unit measures and records changes in the electrical resistance of a thin metal track applied on an insulating substrate. If the metal corrodes, the effective cross sectional area of the track decreases and the electrical resistance increases. Sensors made of silver, copper, iron/steel, zinc, lead, tin, aluminium, bronze, and brass at thicknesses from 50 nm to 250 µm were tailored for environments with different corrosivities. The developed technology proved capable of providing high sensitivity, allowing for real-time corrosion monitoring even in low-corrosive indoor cultural heritage facilities. Laboratory tests showed good reproducibility with the standard deviation of parallel measurements at less than ±20% for metals which corrode uniformly in the tested environments. Several examples selected from a broad testing programme in partner museums, libraries, and other institutions show successful applications of the logger system for characterization of air quality control in indoor locations, during transport and in temporary exhibitions; assessment of new buildings and storage facilities; and fundamental studies of optimal conservation and storage procedures. A first outline of a classification system for lead, which is particularly sensitive to the presence of carboxylic acids, is given. The technique has a large potential as an independent method for monitoring air quality in facilities displaying and storing valuable objects of cultural heritage.     

CO2气体保护焊与焊条电弧焊工艺及成本分析

在焊接实验实训中,采用CO2气体保护焊与焊条电弧焊两种焊接方法在同等的条件下现场施焊,进行工艺及成本分析。     

基于信息融合理论的刀具切削状态智能监测

运用多传感器信息融合技术,提出了基于信息融合理论的智能刀具状态监测系统的基本结构框架,该模式将小波变换和人工神经网络的优点结合起来,用小波变换实现特征提取,对刀具的状态进行预报。     

高职院校《金属材料及热处理》教学体系改革探讨

针对《金属材料及热处理》课程传统教学过程中存在的问题,从课程体系、教学方法、课程评价体系等几方面分析教学体系改革的必要性和改革方法,强调教学体系的改革不仅可提高学生的创新性和决策性,同时提高了教师教学水平。     

一种圆形开槽微带天线的设计

根据紧凑型宽带微带天线的设计要求,本文采用开槽技术设计出符合小型化和宽频带要求的天线,并给出了仿真分析结果。仿真结果表明,综合采用上述技术可以同时达到扩展频带和紧凑型的预期设计要求。     

高职教育金工系列课程教师的基本素质

高职金工系列课程教师应具备与高职特色的金属工艺学课程需要相适应的思想品德素质、文化素质、职业素质、创新素质.     

烯烃复分解反应--2005年诺贝尔化学奖综述

烯烃复分解反应是指在金属卡宾化合物的催化作用下,烯烃里的碳—碳双键被拆散、交换、重组,形成新分子的过程。法国的肖万提出了烯烃复分解反应的基本机制;美国的施罗克和格拉布二人继承和发展了肖万的烯烃复分解反应机制,研制出了有效、实用的催化剂。新的合成过程更简单快捷,生产效率更高,副产品更少,产生的有害废物也更少,有利于保护环境,每天都惠及人类。     

基于能级模型的我国金属矿产资源评价

针对我国金属矿产资源的开采利用量大、浪费严重和我国金属矿产资源评价模型研究匮乏等问题,本文首次提出金属矿产资源能级的概念——金属矿产资源为国民经济和社会发展提供商品或服务的能量大小.建立了基于金属矿产资源质量M、数量Q、重要程度I和技术条件T等4个指标的定量评价模型,对各指标进行细化、归一化并划分等级.以金属铁、铝、金、铜、钼、钨、锡为例的分析表明,其能级分别为1.748、1.015、1.65、1.353、2.419、2.953、2.025,能级模型可对我国所有的金属矿产资源进行能级测算和划分,从而针对不同能级的金属矿产资源采取不同的开采、管理措施,实现我国金属矿产资源的有效管理.