Strategic justification of advanced manufacturing technology using an extended AHP model

Layered manufacturing has emerged as a highly versatile process to produce complex parts compared with conventional manufacturing processes, which are either too costly to implement or just downright not possible. However, this relatively new manufacturing process is characterized by a few outstanding issues that have kept the process from being widely applied. One such issue is the reduced part accuracy caused by the primitive method of generating the layer contours. Current practice generates the layer contours by simply intersecting a set of parallel planes through the computer model of the design part. The volumetric geometry of each layer is then constructed by extruding the layer contour by the layer thickness in the part building direction. This practice often leads to distorted part geometry due to the unidirectional bias of the extruded layers. This paper proposes a novel scheme to correct the systematic part distortion of layered manufactured parts resulting from the improperly generated layer contours. A new layer contour generation method utilizing the sectional projected data of a point cloud representation of the part surface is introduced. The systematic part distortion is reduced by extruding the outer boundary of the projected point data into the layer volumetric geometry. The boundary contour construction algorithm is able to adapt to changing density of the point set in order to keep the captured level of detail consistent. Specifically devised case studies were carried out to validate the proposed method.     

武汉丽人源生物科技发展有限公司产业园及无菌车间设计

通过对武汉丽人源生物科技发展有限公司园区及无菌车间设计的介绍,阐述工业园及工业厂房的设计思路,探讨其发展策略、发展方式和实施策略。     

地道通风在莫高窟游客服务中心空调系统中的应用

莫高窟地处甘肃省西北部的敦煌市,当地全年气候干燥,为自然除湿创造了有利的条件。介绍了莫高窟游客服务中心接待大厅地道通风的地道设计、运行工况、热舒适指标计算,计算结果表明,室内环境的热舒适状况能满足规范要求。     

THE BOUNDEDNESS OF BILINEAR SINGULAR INTEGRAL OPERATORS ON SIERPINSKI GASKETS

In the paper we give the boundedness estimate of bilinear singular integral operators on Sierpinski gasket inspired from[1].     

居住区园林植物应用探析——以池州森桥·印象小区为例

以居住区园林植物配置与应用时所遵循的生态学理论为指导,确立了生态园林观念,强调居住区园林植物配置应以再现自然,改善和维持小区生态平衡为宗旨,以人与自然和谐相处为目标,以园林绿化的系统性、生物发展的多样性、植物造景为主题的可持续性为使命,以达到平面上的系统性、空间上的层次性、时间上的相关性.     

国家主权财富基金的投资特点及其对国际货币体系与金融市场的影响

国家主权财富基金按来源可分为两类,一类来源于资源性商品出口所得外汇,一类则是以国家的官方外汇储备转移为基础而建立的.主权财富基金的目的主要有三个:平滑经济周期、分散风险和取得相对外汇储备更高的收益率.主权财富基金的投资组合表现出来的特点是本土性倾向、以北美和欧洲为主要国际投资区域、偏重大盘股和金融行业,并表现出多元化趋势.从其投资和运行特点来看,主权财富基金更可能维持甚至促进现有的国际货币体系的延续,而对金融市场则更有可能产生积极的稳定作用.     

PREPARATION OF POLYALKYLCYANOACRYLATE NANOPARTICLES WITH VARIOUS MORPHOLOGIES

The effects of various reaction conditions on the preparation of polyalkylcyanoacrylate(PACA)nanoparticles are studied. The PACA nanoparticles with different crosslinking degrees and morphology arc prepared. Addition of crosslinkers can not only adjust the particle size,but also change the morphology of PACA nanoparticles. Moreover,the loose network structure of the PACA nanoparticles with core/shell-like morphology is investigated by AFM and TEM in detail.