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The effect of extrusion conditions on the properties and textures of AZ31B alloy

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Journal of Magnesium and Alloys 2017年第2期5卷 202-209页

作者： Qiang liu Xiao Zhou Haitao Zhou Xiaohui Fan keming liu Key Laboratory of Nonferrous Metal Materials Science and Engineering of Ministry of Education School of Materials Science and EngineeringCentral South UniversityChangsha 410083China Jiangxi Key Laboratory of Advanced Copper and Tungsten Materials Jiangxi Provincial Academy of ScienceNanchang 330029China

The effect of extrusion conditions on the tensile properties and texture of AZ31B alloy has been investigated by means of optical microscopy(OM),scanning electron microscopy(SEM),electron backscattered diffraction(EBSD)and tensile *** is found that the ultimate tensile strength(UTS),the yield strength(YS)and elongation(EN)of the extruded AZ31B alloy are more significantly influenced by extrusion velocities in contrast with *** the extrusion conditions are different,the {1102} texture is the chief texture in the AZ31B after ***,the extrusion textures become scattered with increasing the temperatures at the same extrusion *** the extrusion velocity is raised at the same temperature,the orientation density of textures increases and the separated textures become relatively *** leads to the changes of tensile properties at different extrusion conditions.©2017 Production and hosting by Elsevier *** behalf of Chongqing University.

关键词： AZ31B magnesium alloy Hot extrusion Textures Properties Temperature

Copper Removal from Molten Steel by Gasification

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Journal of Iron and Steel Research International 1999年第2期6卷 10-13页

作者： Li Liansheng Li Shiqi Xiang Changxiang Cao Jie liu keming Li Suqin University of Science and Technology Beijing

A novel method is proposed to enhance the gasification and removal of copper from molten steel by adding ammonium salts or urea into molten steel under normal *** decopperization experiments were conducted in a molybdenum-wire resistance furnace at 1 873 *** copper content of about 400 g of a mild steel was reduced from 0.49%(mass fraction,the same below) and 0.51% to 0.31% and 0.38% using 0.7 g of NHC1 and 0.5 g of(NH)COrespectively,while the copper content of the molten steel was reduced from 0.61%to 0.56% using 2.00 g of NHCONH.

关键词： molten steel copper removal ammonium salt

Human-robot interface based on sEMG envelope signal for the collaborative wearable robot

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Biomimetic Intelligence & Robotics 2023年第1期3卷 38-45页

作者： Ziyu Liao Bai Chen Dongming Bai Jiajun Xu Qian Zheng keming liu Hongtao Wu College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China Mechanical and Electrical Engineering College of Jinhua Polytechnic Jinhua 321016China Key Laboratory of Crop Harvesting Equipment Technology of Zhejiang Province Jinhua 321016China

Surface electromyography(sEMG)control interface is a common method for human-centered *** have frequently improved the recognition accuracy of sEMG through multichannel or high-precision signal acquisition ***,this increases the cost and complexity of the control ***,this study developed a control interface based on the sEMG enveloped signal for a collaborative wearable robot to improve the accuracy of sEMG recognition based on the time-domain(TD)***,an acquisition device is developed to obtain the sEMG envelope signal,and 11 types of TD features are extracted from the sEMG envelope signal acquired from the upper ***,a dimension reduction method based on the correlation coefficient is proposed,transforming the 11-dimensional feature into a five-dimensional envelope feature set without decreasing the ***,a recognition algorithm based on a neural network has also been proposed for gesture ***,the recognition accuracy of the proposed method,principal component analysis(PCA)feature set,and Hudgins TD feature set is compared,with their accuracy at 84.39%,72.44%,and 70.89%,***,the results indicate that the envelope feature set performs better than the common gesture recognition method based on signal channel sEMG envelope signal.

关键词： Surface electromyography(sEMG) Gesture recognition Features extraction Wearable robot

AN ADAPTIVE COLOR PLANE INTERPOLATION METHOD BASED ON EDGE DETECTION

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Journal of Electronics(China) 2007年第2期24卷 261-266页

作者： Cheng Yongqiang Xie keming Zhou Yingfeng liu Yanlong College of Information Engineering Taiyuan University of Technology Taiyuan 030024 China

In this letter, an adaptive interpolation algorithm based on edge detection is proposed. With this algorithm, all the missing green values can be reconstructed in Bayer pattern image by using edge detection interpolation method. Reconstructed images composed of green pixels are classified according to the high frequency components in image, and the threshold T needed for all kinds of green images in the edge detection is determined through experiments. The edge detection is carried out based on the one Dimensional (1D) gradient operator. If the gradient value is greater than T, this pixel is located on the edge; otherwise the pixel is in the smooth area of the image. Finally, the simple bilinear interpolation is used for the smooth area while the Laplacian interpolation with the second-order correction term is adopted to reconstruct the other red/blue values on the edge. This algorithm resolves effectively the conflicts between reconstructing high quality color image and reducing computational complexity, and thus largely enhances the processing speed for the reconstructed color image.

关键词： Color filter array Bayer pattern Color Filter Array (CFA) interpolation Edge detection

The Perspective Theory of Zong Bing in the 5^(th) Century of China

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Computer Aided Drafting,Design and Manufacturing 2003年第1期13卷 73-82页

作者： liu keming Zuo Hongshan Huazhong University of Science and Technology 430074, China HuazhongUniversityofScienceandTechnology430074 China

A brief historical introduction of researches on perspective in ancient China is presented, this paper studied and discussed the perspective theory or Zong Bing (宗炳) in the 5th century of China, including Zong Bing ... 详细信息

关键词： Zong Bing perspective theory

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历史课程改革如何回应中华优秀传统文化教育

课程．教材．教法 2019年第1期39卷 86-90,98页

作者：刘克明江苏省教育科学研究院南京210013

中华优秀传统文化具有丰富的立德树人的价值,历史课程对于实施传统文化教育有着天然的优势。当前,有必要也有可能通过历史课程改革将这种优势充分彰显出来。具体而言,中学历史课程可以从三个方面给予积极的回应,即认识中华优秀传统文化... 详细信息

中华优秀传统文化具有丰富的立德树人的价值,历史课程对于实施传统文化教育有着天然的优势。当前,有必要也有可能通过历史课程改革将这种优势充分彰显出来。具体而言,中学历史课程可以从三个方面给予积极的回应,即认识中华优秀传统文化的教化功能、探索中华优秀传统文化的教育策略、发挥中华优秀传统文化教育的课程张力。这三方面是一个文化精神、教育行为与课程结构三要素的有机递进与贯通。

关键词：历史课程改革中华优秀传统文化基础教育

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赵学田对中国图学学科建设的贡献

图学学报 2016年第4期37卷 443-450页

作者：刘克明华中科技大学人文学院湖北武汉430074

中国当代图学学科的建制发轫于图学教育。著名图学家赵学田教授,以毕生的精力献身图学教育、普及图学知识,教学中将机械制图最基本的投影几何知识点编成歌诀、以口诀讲授,积极倡导图学电化教学;并筹办湖北省制图学会暨全国制图学术交流... 详细信息

中国当代图学学科的建制发轫于图学教育。著名图学家赵学田教授,以毕生的精力献身图学教育、普及图学知识,教学中将机械制图最基本的投影几何知识点编成歌诀、以口诀讲授,积极倡导图学电化教学;并筹办湖北省制图学会暨全国制图学术交流会、成立中国工程图学学会、推动中国图学史——即学科历史的研究,为中国当代图学学科的建制化过程作出了贡献,他是中国图学学科建设的奠基人。

关键词：图学学科赵学田图学教育中国图学学会建制化图学史

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《墨子》的几何学与图学成就及其科学价值

图学学报 2018年第1期39卷 148-158页

作者：刘克明华中科技大学人文学院湖北武汉430074

《墨子》是我国古代最早论述图学知识、图学思想的科技史著作。《墨子》一书中的论述与记载表明:图形、图样与文字、数字一样,在人类的社会进步和科技发展过程中起着不可替代的作用。对《墨子》的研究,特别是对其图学基本概念与基本理... 详细信息

《墨子》是我国古代最早论述图学知识、图学思想的科技史著作。《墨子》一书中的论述与记载表明:图形、图样与文字、数字一样,在人类的社会进步和科技发展过程中起着不可替代的作用。对《墨子》的研究,特别是对其图学基本概念与基本理论的探讨及其历史地位;仍是一个有待深入和系统阐明的课题。本文通过考察《墨子》对有关图学理论研究的尝试,探讨中国古代科学技术中的图学实践与图学知识的成果,以及这些图学成果所体现的中国图学传统与科学探索精神。

关键词：图样图学墨子

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中国图学投影理论及其研究

图学学报 2014年第2期35卷 155-160页

作者：刘克明华中科技大学湖北武汉430074

图学论证了在二维平面上绘制三维空间几何形状的图形的方法,是研究投影法绘制工程图样和解决空间几何问题、理论及方法的技术基础学科。中国是一个具有丰富图学传统的国家。中国图学的投影理论及其研究在先秦之前已有见端倪,魏晋时期已... 详细信息

图学论证了在二维平面上绘制三维空间几何形状的图形的方法,是研究投影法绘制工程图样和解决空间几何问题、理论及方法的技术基础学科。中国是一个具有丰富图学传统的国家。中国图学的投影理论及其研究在先秦之前已有见端倪,魏晋时期已提出焦点透视的图学理论,宋元之际,图样绘制之精,投影画法的创新,使图学理论大具。中国图学的投影理论不仅为中国古代科技的发展提供了信息支撑,也为近代中国图学迅速走向近现代奠定了理论基础。

关键词：图学投影理论焦点透视散点透视