课程文献中心 更多>>

关键词： 纺织品   隔热   红外热成像  

摘要： 本文采用卤素射灯模拟太阳光照射,结合红外热像仪测量,提出了一种新型纺织品隔热性能测试方法。通过对比不同样品在15 min照射下的温度差异,得出隔热值以评估隔热性能。研究发现,测试时间15 min时隔热值趋于稳定,且方法具有较高的稳定性和重复性,可以有效地对织物的隔热性能进行评价。

关键词： Coronary computed tomography angiography   Plaque analysis   Ischemia   Fractional flow reserve   Vessel   Percent atheroma volume   AUC   Area under the curve   CAD   Coronary Artery Disease   CCTA   Coronary Computed Tomography Angiography   DS   Diameter Stenosis   FFR   Fractional Flow Reserve   NCP   Non-Calcified Plaque   LAD   Left Anterior Descending coronary artery   LCX   Left Circumflex Artery   PAV   Percent Atheroma Volume   RCA   Right Coronary Artery  

摘要： Discrepancies between stenosis severity assessed at coronary computed tomography angiography (CCTA) and ischemia might depend on vessel type. Coronary plaque features are associated with ischemia. Thus, we evaluated the vessel-specific correlation of CCTA-derived diameter stenosis (DS) and invasive fractional flow reserve (FFR) and explored whether integrating morphological plaque features stratified by vessel might increase the predictive yield in identifying vessel-specific ischemia.

关键词： 机械制图   岗课赛证   课程改革  

摘要： 智能制造产业变革背景下,培养职业技能人才高度运用工程技术语言进行生产描述与交流的能力变得尤为重要。文章针对机械制图与CAD技术基础课程存在的学科体系色彩浓厚、专业技术实践性较弱等问题,提出基于“岗课赛证”课程项目化开发与实践方案,有效地提高了课堂学习效率。

关键词： end-stage renal disease   intravascular ultrasound   optical coherence tomography   percutaneous coronary intervention   ACS   acute coronary syndrome(s)   CAD   coronary artery disease   ESRD   end-stage renal disease   IVI   intravascular imaging   MACE   major adverse cardiovascular event(s)   NHI   National Health Insurance   NHIRD   National Health Insurance Research Database   RA   rotational atherectomy  

摘要： Patients with end-stage renal disease (ESRD) are at a higher risk of cardiovascular diseases. Intravascular imaging (IVI)-guided percutaneous coronary intervention (PCI) using optical coherence tomography (OCT) or intravascular ultrasound (IVUS) has been shown to result in better clinical outcomes than angiography guidance. Nevertheless, the clinical outcomes of IVI-guided PCI in ESRD patients remain uncertain.

关键词： 纺织品   家纺产品   敏感颜色   氧化变色  

摘要： 近年来,纺织品在储存、放置过程中发生变色的情况不断发生,如仓库、门店等不同的位置出现不同情况的变色现象。针对这一现象,在最常见的温湿度、D65光照条件下,对不同染料、不同助剂整理后的样品进行大量试验,找到解决办法,提高产品质量防止出现变色。同时,激发行业内面料生产商进行思考,共同找到改进办法,有效预防和控制面料变色现象,提高纺织品的性能和实用性。

摘要： Purpose / Aim: To evaluate the effect of two polishing protocols on the surface roughness, gloss, and surface topography of CAD/CAM composites before and after adjustments. Materials & Methods: Ten specimens (13.5mmX11mmX3mm) of Tetric-CAD (Ivocla...

关键词： Kinematic constraint prediction   CAD assemblies   State-by-state assembly   Graph convolutional network   Decision-making  

摘要： This paper presents a machine learning-based approach to predict kinematic constraints between CAD models that have potentially never been assembled together before. During the learning phase, the algorithm is trained to predict the next-possible-constraints between a set of parts candidate to the assembly. Assemblies are represented in a new graph-based formalism that is capable of capturing features associated with parts, interfaces between parts and constraints between them. Using such a multi-level feature extraction strategy coupled to a state-by-state graph decomposition, the approach does not need to be trained on a large database. This formalism is used to model both the network input and output where the next-possible-constraints appear after evaluation. The core of the approach relies on a series of networks based on a link-prediction encoder–decoder architecture, integrating the capabilities of several convolutional networks trained in an end-to-end manner. A decision-making algorithm is added to post-process the output and drive the prediction process in finding one among the set of next-possible-constraints. This process is repeated until no more constraints can be added. The experimental results show that the proposed approach outperforms state-of-the-art methods on such assembly tasks. Although the state-by-state assembly algorithm is iterative, it still takes into account the whole set of parts as well as the whole set of constraints already predicted, and this makes it possible to handle constraint cycles, which is generally not possible when not considering multiple parts as input.

关键词： 数字化期刊   产业用纺织品   全文版   中国学术期刊   邮发代号   ISSN   万方数据   全彩色印刷  

摘要： 《产业用纺织品》(月刊),大16开,全彩色印刷,定价12.00元/册,全年144.00元,中国标准连续出版物号ISSN 1004-7093 CN 31-1595/TS,邮发代号4-492。《产业用纺织品》由东华大学主办,已入编中国学术期刊(网络版)、万方数据-数字化期刊群、中文科技期刊数据库(全文版)、长江文库及超星期刊域出版平台等。

关键词： CAD   Graphic processing technology   Mechanical design  

摘要： This study systematically discusses the innovative application of 3D CAD technology in automotive machinery design, and constructs a closed-loop design system from parametric modeling to multi-physics simulation. At the engineering verification level, taking the design of the conveyor chain of automobile axle forging as an example, the intermittent transmission mechanism was optimized based on virtual prototype simulation technology, and the dynamic trajectory planning and topology optimization algorithm of ratchet indexing device were adopted to significantly improve the motion stability and structural stiffness of the conveyor system. The results show that 3D CAD technology can systematically solve the efficiency bottleneck and engineering error problems in the traditional design process through four technical paths: parametric modeling, virtual assembly verification, modular deformation design and multi-physical field co-simulation, greatly reduce the design iteration cycle, and realize the deep integration of geometric accuracy and process specifications.

关键词： CAD/CAM数字化设计   传统印模技术   前牙美容修复   牙齿美观度  

摘要： 目的 分析在前牙美容修复中应用CAD/CAM数字化设计的效果.方法 选取2023年1月-2024年12月于我院接受前牙美容修复治疗的62例患者为研究对象,根据治疗方式不同分为对照组和观察组,各31例.对照组采用传统印模技术进行前牙美容修复,观察组采用CAD/CAM数字化设计进行前牙美容修复,比较两组修复效果、牙齿美观度及满意度.结果 观察组修复总有效率(96.77%)高于对照组(80.65%)(P<0.05);观察组修复后外观、颜色、整齐度、牙龈健康评分均高于对照组(P<0.05);观察组满意度(93.55%)高于对照组(77.42%)(P<0.05).结论 CAD/CAM数字化设计在前牙美容修复中的应用效果优于传统印模技术,修复后牙齿美观度更佳,有利于提高患者满意度.