Sub-pixel high precision dimensional measurement method for aero-engine hollow turbine blade based on industrial computed tomography image

Aero-engine hollow turbine blades are work under prolonged high temperature,requiring high dimensional accuracy.Blade profile and wall thickness are important parameters to ensure the comprehensive performance of blades,which need to be measured accurately during manufacturing process.In this study,a high accuracy industrial computed tomography(ICT)measuring method was developed based on standard cylindrical pin and ring workpieces of different sizes.Combining ICT with cubic spline interpolation,a sub-pixel accuracy was achieved in measuring the dimension of component.Compared with the traditional and whole-pixel level image measurement method,the cubic spline interpolation algorithm has the advantages of high accuracy in image edge detection and thus high accuracy of dimensional measurement.Further,the technique was employed to measure the profile and wall thickness of a typical aerospace engine turbine blade,and an accuracy higher than 0.015 mm was obtained.

The role of new ICTs in the sustainable development of industrial cluster:a case study of Yangxunqiao textile cluster

The wide application of new information and communication technologies(ICTs)has been argued to be critical in local economic development,while the application of new ICTs will affect the development of industrial cluster,especially those small and medium-sized enterprises(SMEs).This paper examines Yangxunqiao textile cluster located in Zhejiang Province as a case study to focus on the role of ICTs in the sustainable development.We argue ICTs application in firms boost flexible and customized production approach,improve e-commerce market channel and raise supply chain management.We also pay special attention to the spatial implication of ICTs adoption in industrial cluster,and suggest that application of ICTs tend to lead to further clustering of SMEs in the location with mature production chain.Our analysis shows that new ICTs are a facilitator in the sustainable development of the industrial cluster.

Radiation protection in the design of λ-ray industrial computed tomography systems

The recent increasing use of γ-rays industrial computed tomography(γ-rays ICT) in various fields has induced greater attention to its performance as well as to considerations of radiation safety. It is understood that radiation protection planning cannot be sacrificed for the sake of CT image quality during the design, manufacture,and layout of γ-rays ICT systems. In the present work, we describe a typical γ-rays ICT system in brief, and, based on experience and pertinent examples, we propose design requirements for ensuring the radiation safety of the sealed radioactive source, source container, and workspace. The design examples and dose rate measurement results illustrate that the proposed design standards are reasonable,feasible, and safe, and are therefore meaningful for the design, manufacture, and layout of γ-rays ICT systems. This paper discussed the predominant measures associated with the radiation protection of γ-rays ICT systems in accordance with the pertinent Chinese standards. In addition, based on experience and pertinent examples, the design requirements for ensuring the radiation safety of a sealed radioactive source, source container, and workspace were defined in detail. The design examples and dose rate measurements conducted in conjunction with a γ-rays ICT system and workspace employing the proposed design standards have illustrated that the proposals provided in this paper are reasonable, feasible, and safe, and are therefore meaningful for the design, manufacture, and layout of γ-rays ICT systems.

Development of the Mechanical System on a Third-Generation Industrial Computed Tomography Scanner in Brazil

The development of measurement geometry for medical X-ray computed tomography （CT） scanners was carried out from the first to the fourth-generation. This concept has also been applied for imaging of industrial processes such as pipe flows or for improving design, operation, optimization and troubleshooting. Nowadays, gamma CT permits to visualize failure equipment points in three-dimensional analysis and in sections of chemical and petrochemical industries. The aim of this work is the development of the mechanical system on a third-generation industrial CT scanner to analyze laboratorial process columns which perform highly efficient separation, turning the ^6oCo, ^75Se, ^137Cs and/or ^192Ir sealed gamma-ray source（s） and the NaI（Tl） multidetector array. It also has a translation movement along the column axis to obtain as many slices of the process flow as needed. The mechanical assembly for this third-generation industrial CT scanner is comprised by strength and rigidity structural frame in stainless and carbon steels, rotating table, source shield and collimator with pneumatic exposure system, spur gear system, translator, rotary stage, drives and stepper motors. The use of suitable spur gears has given a good repeatability and high accuracy in the degree of veracity. The data acquisition boards, mechanical control interfaces, software for movement control and image reconstruction were specially development. A multiphase phantom capable to be setting with solid, liquid and gas was testing. The scanner was setting for 90 views and 19 projections for each detector totalizing 11,970 projections. Experiments to determine the linear attenuation coefficients of the phantom were carried out which applied the Lambert-Beer principle. Results showed that it was possible to distinguish between the phases even the polymethylmethacrylate and the water have very similar density and linear attenuation coefficients. It was established that the newly developed third-generation fan-beam arrangement gamma scanner unit has a good spatial resolution acceptable given the size of the used phantom in this study. The tomografic reconstruction algorithm in used 60 ~ 60 pixels images was the Alternative Minimization （AM） technique and was implemented in MATLAB and VB platforms. The mechanical system presented a good performance in terms of strength, rigidity, accuracy and repeatability with great potential to be used for education or program which dedicated to training chemical and petrochemical industry professionals and for industrial process optimization in Brazil.

企业主导的现代产业学院是如何建设的?——以华为ICT学院为例

现代产业学院是促进产教融合的有效平台,是多主体联合区域产业发展所需复合型高技术技能人才的重要载体。华为ICT学院是现代产业学院建设的典型模式,主要从五个方面进行了创新性建设:制定适应ICT人才特点的人才培养方案;打造以实验实训平台为核心的ICT基础设施;组建校企混编的专业课教学团队;构建以实用理论与实际操作类为主的课程体系;实施对华为ICT学院人才培养质量的多元监控。华为ICT学院建设案例对现代产业学院建设的启示为:要重视企业利益,激发企业主体活力;要明细校企双方权责,规范工作流程;要注重合作的全面性和系统性,协同推进各项工作。

产教融合背景下的高校ICT类专业实训基地建设研究

产教融合是当前高等教育领域的热门话题,如何开展校企深度合作,打造一流的产教融合实训基地,改革创新校企共同育人的教学方法和教学模式,培养学生综合实践技能以及创新创业综合素质,提升人才培养质量是很多高等院校一直在思考的问题.通过对ICT类专业产教融合实训基地建设进行深入研究,提出了一些方法与途径,以促进高等院校与企业在教学、生产和创新创业工作方面的相互配合、相互支持,有效推进校企合作共赢.

Research of Large Field of View Scan Mode for Industrial CT

For industrial computed tomography systems, generation II scan mode has a large field of view but time consuming and generation III has a small field of view but fast. In order to realize the rapid ICT test of large objects, a scan mode based on generation III called large field of view scan was discussed and its reconstruction algorithm based on FBP was deduced. The validity of the algorithm was verified by the results of computer simulation and experiments. Analysis showed that the effective scan field of view could be improved by more than 90% compared with that of generation III.

Intelligent detection method for workpiece defect based on industrial CT image

In order to solve the problem of internal defect detection in industry, an intelligent detection method for workpiece defect based on industrial computed tomography (CT) images is proposed. The industrial CT slice image is preprocessed first with the combination of adaptive median filtering and adaptive weighted average filtering by analyzing the characteristics of the industrial CT slice images. Then an image segmentation algorithm based on gray change rate is used to segment low contrast information in industrial CT images, and the feature of workpiece defect is extracted by using Hu invariant moment. On this basis, the radial basis function (RBF) neural network model is established and the firefly algorithm is used for optimization, and the intelligent identification of the internal defects of the workpiece is completed. Simulation results show that this method can effectively improve the accuracy of defect identification and provide a theoretical basis for the detection of internal defects in industry.

Non Destructive 3D, 4D Microscopy and Mineral Phase Characterization in Industrial Minerals, Composites to Construction Materials

Conventional electron and optical microscopy techniques require the sample to be sectioned, polished or etched to expose the internal surfaces for imaging. However, such sample preparation techniques have traditionally prevented the observation of the same sample over time, under realistic three-dimensional geometries and in an environment representative of real-world operating conditions. X-ray microscopy (XRM) is a rapidly emerging technique that enables non-destructive evaluation of buried structures within hard to soft materials in 3D, requiring little to no sample preparation. Furthermore in situ and 4D quantification of microstructural evolution under controlled environment as a function of time, temperature, chemistry or stress can be done repeatable on the same sample, using practical specimen sizes ranging from tens of microns to several cm diameter, with achievable imaging resolution from submicron to 50 nm. Many of these studies were reported using XRM in synchrotron beamlines. These include crack propagation on composite and construction materials; corrosion studies; microstructural changes during the setting of cement; flow studies within porous media to mention but a few.

ICT资本对旅游绿色发展效率的影响机理研究

ICT资本赋能旅游业绿色转型,驱动旅游业走向高质量发展道路。文章创新性地核算了中国30个省(区、市)的ICT资本和旅游绿色发展效率,采用SYSGMM和空间杜宾模型验证了ICT资本对旅游绿色发展效率的影响机制及其空间溢出效应。研究结果表明:(1)ICT资本对旅游绿色发展效率具有持续的积极影响。(2)ICT资本主要通过激发旅游技术创新、优化旅游产业结构、提升旅游人力资本来提高旅游绿色发展效率。(3)ICT资本对旅游绿色发展效率具有正向的空间溢出效应,且空间间接效应强于直接效应。在地理矩阵下,ICT资本对东部和西部省(区、市)的旅游绿色发展效率具有显著的空间溢出效应;而在经济矩阵下,东部和中部省(区、市)旅游绿色发展效率受ICT资本影响较显著。这为中国充分释放ICT资本红利,塑造中国旅游绿色发展格局,全面提升旅游绿色发展效率提供了价值指导。

Analysis on Technical Structure and Competitiveness of ICT Manufacturing Industries

In order to analyze the technical structure and international comparative advantage of the information and communication technology(ICT)manufacturing industry,a complete set of ICT manufacturing product categories has been constructed by matching National Economical Industry Classification(GB/T4754-2017)with Harmonized System(HS)Codes,based on the relevant definitions in International Standard Industrial Classification(ISIC).The proposed definition overcomes inherent defects such as inaccurate scopes,lagging data and rough categories,which are characterized by commonly utilized product-level based classification approaches.Within the given framework,this paper has designed the technology content related indicators from the perspective of production distribution,and divided ICT product categories into high-end,medium-end and lowend manufacturing classifications according to respective global shares.Then,we have calculated international market shares(IMS),revealed comparative advantages(RCA),and market penetration rates(MPR)of ICT manufacturing exports for major economies from 2010 to 2021.Finally,development characterizations of ICT manufacturing industries for China’s Mainland are analyzed,and several practical suggestions are provided.

Effect of warhead wall thickness on charge uniformity in industrial CT detection

Uniformity of warhead axial charge and influences of different warhead wall thicknesses on measurement results were studied by industrial computed tomography(C T).By comparing the differences of relative density values of the same simulation charge sample assembled in simulation bodies with different wall thicknesses,effects of warhead wall thickness on charge CT relative density values were analyzed.The results show that CT value increases by about1%with the increase of each additional1mm of wall thickness under the same simulation charge for the projectile with outer diameter of100mm and internal diameterof90mm.There fore,to detect uniformity along warhead axial(upper,middle and lower sections)charge density within penetration ability range of industrial CT(IC T),the CT values of various parts(upper,middle and lower sections)may be only measured without measuring absolute density of charge.By subtracting changes in the CT values caused by warhead wall thickness variation,the CT values of various parts under the same charge can describe warhead axial charge uniformity.

ICT优质项目管理策略

当下全球运营商市场环境复杂多变,未知挑战加剧,政企业务随着各类企业加速信息化转型蓬勃发展。在这样的时代背景之下,政企业务发展战略将在很大程度上决定运营商的商业成功,如何做好做强ICT项目迫在眉睫。本文以评定ICT优质项目作为切入口,从项目管理、技术、组织模式3个角度提出发展策略,优化现有项目管理流程,打造优质ICT项目行业标杆,规避原项目流程风险,提升项目中标率及利润。

基于ICT切片图像的航空发动机涡轮叶片壁厚检测

该文针对航空发动机中的涡轮叶片的检测问题,研究了基于ICT切片图像的叶片壁厚测量方法。该方法主要在关键点选取上进行了较好的筛选,并对结果进行了拟合。实验结果表明,采用该测量方法可以保证检测误差小,测量结果直观等特点。从而较好地满足了航空发动机中对叶片壁厚检测的要求。

基于PC/DSP的ICT图像重建系统研究

设计了一种基于PC/DSP (PersonalComputer/DigitalSignalProcessor)的ICT (IndustrialComputedTomography)图像重建系统 ,论述了整个系统的硬件组成和工作原理 ,介绍了系统中PCI型DSP信号处理板的设备驱动程序的主要内容 ,给出了整个系统的试验结果。结果表明 :该系统能有效缩短ICT图像重建的时间 。

出口导向加工贸易政策对产业升级的影响——基于ICT产品进出口数据的实证分析

文章利用国际贸易标准分类SITC3.下5位数编码的ICT产品的进出口数据,分别计算了我国ICT产业中制成品及零部件的NET值。NET值的变化趋势结果表明,通过加工贸易生产过程中的技术溢出及加工贸易政策的调整,我国出口导向的加工贸易政策促进了ICT产业的整体升级①,从而在一定程度上证明了加工贸易政策的有效性,并指出我国出口高科技产品的生产依然处于国际产品价值链低端的言论有待商榷。

一种提高复杂产品ICT切片轮廓反求精度的方法

在提高复杂产品ICT(industrialcomputedtomography)切片轮廓反求精度的研究中 ,提出了一种基于最佳阈值的方法来进行轮廓数据提取的算法。该算法不但可以提高复杂产品ICT切片轮廓的反求精度 ,而且还具有所需计算机消耗低。

基于协整分析的我国ICT产业国际竞争力影响因素实证研究

我国信息通信技术(ICT)产业在经济转型过程中发挥着重要的作用,在国际上的竞争力也在不断增强。在我国ICT产业国际竞争力现状分析的基础上,利用协整检验分析ICT产业国际竞争力影响因素的作用强度及性质,探讨影响竞争力表现的深层次原因。实证结果显示,技术创新因素对ICT产业国际竞争力的正向影响作用最大,企业数量、外商直接投资对ICT产业国际竞争力起到不同程度的负向作用。

跨国公司技术控制背景下我国ICT产业的专利战略探讨

随着我国ICT产业的发展和企业竞争力的增强,跨国公司开始对我国企业加强技术控制,设置技术壁垒,阻碍国内企业的发展。专利已经成为制约我国ICT产业发展的瓶颈。在研究我国ICT产业专利状况和跨国企业技术控制的基础上,提出建立以政府为引导、企业为主体的自主创新体系,制定和实施适合我国ICT产业发展的专利战略,才能抓住ICT产业全球性转型契机,赢得后发优势,实现技术跨越。

ICT投资、偏向性技术变化与全要素生产率

本文从偏向性技术变化视角出发,建立包含ICT资本、非ICT资本和劳动的平行三要素供给面方程系统模型,在要素增强型技术进步模式可变的条件下,分析我国工业ICT资本偏向性技术变化、ICT资本和非ICT资本偏向性技术变化一致性、ICT资本偏向性技术变化和ICT资本深化一致性对全要素生产率(TFP)的影响。研究结果表明:2000—2016年,在我国ICT投资快速增长的背景下,ICT资本对非ICT资本和劳动反而出现双重偏向性技术下滑,且ICT资本偏向性技术变化和ICT资本深化方向不一致,二者共同抑制了TFP提升;而ICT资本和非ICT资本偏向性技术变化一致性促进了TFP提升。据此,我国工业数字化转型中,应当通过提高ICT投资与数字技术发展路线的匹配度来扭转ICT资本偏向性技术下滑,并进一步提高偏向性技术变化一致性,同时增强ICT投资的技术适宜性,从而改善ICT资本偏向性技术变化与ICT资本深化的一致性。