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Low-cost surface modification of a biomedical Zr-2.5Nb alloy fabricated by electron beam melting

Journal of Materials Science & Technology 2023年第12期143卷 178-188页

作者： caixu wang Xiaoli Zhao Shujun Li Lu Liu Deliang Zhang Mitsuo Niinomi School of Materials Science and Engineering Northeastern UniversityShenyang 110819China Shi-changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Key Laboratory of Data Analytics and Optimization for Smart Industry(Ministry of Education) Northeastern UniversityShenyang 110819China Tianjin Key Laboratory of Bone Implants Interface Functionalization and Personalization Tianjin 300190China Institute for Materials Research Tohoku UniversitySendaiMiyagi 9808577Japan Division of Materials and Manufacturing Science Graduate School of EngineeringOsaka UniversityOsaka 565-0871Japan Department of Materials Science and Engineering Graduate School of Science and TechnologyMeijo UniversityNagoya 468-8502Japan Faculty of Chemistry Materials and BioengineeringKansai UniversityOsaka 564-860Japan

The Zr-2.5Nb alloy with a fine microstructure consisting ofαlaths was successfully prepared by electron beam melting(EBM).The thermal oxidation behaviors and kinetics of the as-built,and the EBM-built and hot isostatically pressed(HIPed)Zr-2.5Nb materials in a temperature range of 450-600°C were in-vestigated and compared with those of the alloy prepared by conventional casting and *** was found that the oxidation kinetics of the as-built and the forged materials followed the parabolic rate law during isothermal oxidation at 550°C,but the HIPed materials exhibited a parabolic-to-linear kinetic transition,suggesting that the larger grain sizes enhanced the *** oxide layers of all materials were composed of a large fraction of monoclinic zirconia phase(m-ZrO_(2))and a small fraction of tetrago-nal zirconia phase(t-ZrO_(2)),and transformed from t-ZrO_(2)to m-ZrO_(2)with increasing oxidation *** surface hardness of the as-built,the forged and the HIPed materials increased from 215,204,and 188 HV before oxidation to 902,1070,and 1137 HV after oxidation,*** cross-sections of the materi-als showed the presence of micropores and microcracks inside the oxide layers with thicknesses ranging from 4 to 8μ*** the oxidation temperature of 600°C and oxidation time duration of 3 h,a dense black m-ZrO_(2)oxide layer with smooth surface and 902 HV hardness was obtained on the EBM as-built Zr-2.5Nb materials.

关键词： Zr-2.5Nb alloy Electron beam melting Thermal oxidation Oxidation behaviors and kinetics Grain size

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Conventional and micro scale finite element modeling for metal cutting process:A review

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Chinese Journal of Aeronautics 2024年第2期37卷 199-232页

作者： Le wang caixu YUE Xianli LIU Ming LI Yongshi XU Steven Y.LIANG Key Laboratory of Advanced Manufacturing and Intelligent Technology Ministry of EducationHarbin University of Science and TechnologyHarbin 150080China George W.Woodruff School of Mechanical Engineering Georgia Institute of TechnologyAtlanta 30332USA

The metal cutting process is accompanied by complex stress field,strain field,temperature *** comprehensive effects of process parameters on chip morphology,cutting force,tool wear and residual stress are complex and *** element method(FEM)is considered as an effective method to predict process variables and reveal microscopic physical phenomena in the cutting ***,the finite element(FE)simulation is used to research the conventional and micro scale cutting process,and the differences in the establishment of process variable FE simulation models are distinguished,thereby improving the accuracy of FE *** reliability and effectiveness of FE simulation model largely depend on the accuracy of the simulation method,constitutive model,friction model,damage model in describing mesh element,the dynamic mechanical behavior of materials,the tool-chip-workpiece contact process and the chip formation *** this paper,the FE models of conventional and micro process variables are comprehensively and up-to-date reviewed for different materials and machining *** purpose is to establish a FE model that is more in line with the real cutting conditions,and to provide the possibility for optimizing the cutting process *** development direction of FE simulation of metal cutting process is discussed,which provides guidance for future cutting process modeling.

关键词： Conventional and micro scale Finite element simulation Metal cutting process Micro cutting Modeling

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基于倾斜摄影与深度学习的城市绿地自动识别技术研究

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山西建筑 2024年第11期50卷 190-194页

作者：胡彩旭上海浦江桥隧运营管理有限公司上海200023

城市绿地的数字化是城市数字化建设的重要组成,传统的实地调研和人工识别的处理方式耗时长,工作量大,无法满足现有城市发展的需求。针对这一问题,文章提出了一种基于倾斜摄影和深度学习的城市绿地自动识别和高程信息提取方法,并研究比较... 详细信息

城市绿地的数字化是城市数字化建设的重要组成,传统的实地调研和人工识别的处理方式耗时长,工作量大,无法满足现有城市发展的需求。针对这一问题,文章提出了一种基于倾斜摄影和深度学习的城市绿地自动识别和高程信息提取方法,并研究比较了U-Net,DeepLab v3+,Mask R-CNN三种不同的深度学习模型的识别效果。该方法首先通过倾斜摄影采集城市绿地高质量高分辨的影像,并对影像进行标注建立训练数据集,利用该训练数据集生成深度学习模型,从而实现城市绿地的快速自动识别。在此基础上,利用Python语言,引入GDAL包提取图像的DSM数据,实现了绿地边缘的轮廓坐标与高程信息的自动提取。该方法为快速获得城市绿地的数字化三维信息提供了一种有效的途径,具有良好的应用前景。

关键词：倾斜摄影深度学习城市绿地识别高程信息提取

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基于Spark计算的大数据终端潜在异常识别仿真

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软件 2024年第6期45卷 31-33页

作者：吴彩旭张晶三亚学院海南三亚572022

本文主要针对大数据终端在实时处理过程中潜在的异常情况进行识别和仿真研究。基于Spark计算框架,提出了一种新的方法监测和识别大数据终端中可能存在的异常行为。通过使用实时数据流分析和机器学习技术,及时发现并处理潜在的异常情况,... 详细信息

本文主要针对大数据终端在实时处理过程中潜在的异常情况进行识别和仿真研究。基于Spark计算框架,提出了一种新的方法监测和识别大数据终端中可能存在的异常行为。通过使用实时数据流分析和机器学习技术,及时发现并处理潜在的异常情况,提高数据处理效率和质量,并最终提升系统的可靠性和稳定性。

关键词：大数据终端异常识别 Spark计算实时数据流分析机器学习

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智能刀具设计及关键技术研究进展

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航空制造技术 2024年第7期67卷 96-111页

作者：马尊严岳彩旭周天祥胡德生刘献礼哈尔滨理工大学先进制造智能化技术教育部重点实验室哈尔滨150080

随着“工业4.0”及“中国制造2025”战略计划的兴起,制造业中的智能制造及自动化水平不断提升,刀具作为生产过程中的重要一环,也变得更加精密化和智能化。智能刀具是实现智能制造和自动化生产的重要环节和必要保障,本文围绕智能刀具的... 详细信息

随着“工业4.0”及“中国制造2025”战略计划的兴起,制造业中的智能制造及自动化水平不断提升,刀具作为生产过程中的重要一环,也变得更加精密化和智能化。智能刀具是实现智能制造和自动化生产的重要环节和必要保障,本文围绕智能刀具的最新研究进展进行了详细论述,包括智能刀具设计、智能刀具关键技术、数字孪生技术及智能刀具系统等方面内容。归纳了国内外学者们在智能刀具集成优化与结构设计、智能刀具监测和调控技术、基于刀具管控和推荐的智能刀具系统的研究成果,简述了数字孪生技术在智能刀具领域中的应用,并指出了智能刀具目前存在的不足及未来发展方向。

关键词：智能刀具状态监测智能调控刀具管控数字孪生

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一株3,5,6-三氯-2-吡啶酚降解菌Delftia ***的分离鉴定及降解途径研究

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聊城大学学报（自然科学版） 2024年第2期37卷 89-100页

作者：贾楠岳彩旭吕雪茹王雪婷丁宁王圣惠聊城大学生命科学学院山东聊城252059

微生物降解是消除农药残留物3,5,6-三氯-2-吡啶酚(TCP)的有效方法,但其降解机制并不清楚。为探究TCP完整的代谢途径和降解机制。采用富集分离法从农田土壤中分离了一株TCP降解细菌,并分别通过高效液相色谱和液相色谱-质谱(LC-MS)技术检... 详细信息

微生物降解是消除农药残留物3,5,6-三氯-2-吡啶酚(TCP)的有效方法,但其降解机制并不清楚。为探究TCP完整的代谢途径和降解机制。采用富集分离法从农田土壤中分离了一株TCP降解细菌,并分别通过高效液相色谱和液相色谱-质谱(LC-MS)技术检测了菌株的降解性能,并鉴定了其代谢产物。该菌株为Delftia ***菌,它能在48 h内对50 mg/L的TCP降解率达34.28%,同时也能降解3,5-二氯-2-吡啶醇、6-氯-2-吡啶醇和2-羟基吡啶等其他氯代吡啶类化合物。在降解TCP过程中,共鉴定了12种不同的TCP代谢产物。初步推测水解-氧化脱氯途径、还原脱氯途径、反硝化及烷基化途径可能共同参与了菌株DFT对TCP的降解。据文献调研,这是首次在Delftia sp.菌中发现有四种可能的TCP代谢途径的报道,这为纯培养物中的TCP降解机制研究提供了参考信息。

关键词： 3,5,6-三氯-2-吡啶酚降解菌分离鉴定代尔夫特菌降解途径

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Research on Surface Roughness of Supersonic Vibration Auxiliary Side Milling for Titanium Alloy

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Chinese Journal of Mechanical Engineering 2022年第5期35卷 100-111页

作者： Xuetao Wei caixu Yue Desheng Hu Xianli Liu Yunpeng Ding Steven Y.Liang Key Laboratory of Advanced Manufacturing and Intelligent Technology Ministry of EducationHarbin 150080China Department of Precision Manufacturing Engineering Suzhou Vocational Institute of Industrial TechnologySuzhou 215104China George W.Woodruff School of Mechanical Engineering Georgia Institute of TechnologyAtlanta 30332USA

The processed surface contour shape is extracted with the finite element simulation *** difference value of contour shape change is used as the parameters of balancing surface roughness to construct finite element model of supersonic vibration milling in cutting stability *** surface roughness trial scheme is designed in the orthogonal test design method to analyze the surface roughness test result in the response surface *** surface roughness prediction model is established and ***,the surface roughness finite element simulation prediction model is verified by *** research results show that,compared with the experiment results,the error range of the finite element simulation model is 27.5%–30.9%,and the error range of the empirical model obtained by the response surface method is between 4.4%and 12.3%.So,the model in this paper is accurate and will provide the theoretical basis for the optimization study of the auxiliary milling process of supersonic vibration.

关键词： Side milling Axial vibration Ultrasonic milling Finite element simulation Linear regression Surface roughness

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Adiabatic Shear Mechanisms for the Hard Cutting Process

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Chinese Journal of Mechanical Engineering 2015年第3期28卷 592-598页

作者： YUE caixu wang Bo LIU Xianli FENG Huize CAI Chunbin State Engineering Laboratory of High Efficiency Cutting and Tool Harbin University of Science and Technology

The most important consequence of adiabatic shear phenomenon is formation of sawtooth chip. Lots of scholars focused on the formation mechanism of sawtooth, and the research often depended on experimental approach. For the present, the mechanism of sawtooth chip formation still remains some ambiguous aspects. This study develops a combined numerical and experimental approach to get deeper understanding of sawtooth chip formation mechanism for Polycrystalline Cubic Boron Nitride（PCBN） tools orthogonal cutting hard steel GCr15. By adopting the Johnson-Cook material constitutive equations, the FEM simulation model established in this research effectively overcomes serious element distortions and cell singularity in high strain domain caused by large material deformation, and the adiabatic shear phenomenon is simulated successfully. Both the formation mechanism and process of sawtooth are simulated. Also, the change features regarding the cutting force as well as its effects on temperature are studied. More specifically, the contact of sawtooth formation frequency with cutting force fluctuation frequency is established. The cutting force and effect of cutting temperature on mechanism of adiabatic shear are investigated. Furthermore, the effects of the cutting condition on sawtooth chip formation are researched. The researching results show that cutting feed has the most important effect on sawtooth chip formation compared with cutting depth and speed. This research contributes a better understanding of mechanism, feature of chip formation in hard turning process, and supplies theoretical basis for the optimization of hard cutting process parameters.

关键词： adiabatic shear FEM simulation hard cutting process sawtooth chip

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Charged Multiplicity Density and Number of Participant Nucleons in Relativistic Nuclear Collisions

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Communications in Theoretical Physics 2003年第2期39卷 212-218页

作者： SABen－Hao caixu 等 ChinaInstituteofAtomicEnergy P.O.Box275（18）Beijing102413China InstituteofParticlephysics HuzahongnormalUniversityWuhan430079China CCAST（WorldLab.），P.O.Box8730 Beijing100080China

The energy and centrality dependencies of charged particle pseudorapidity density in relativistic nuclear collisions were studied using a hadron and string cascade model, JPCIAE. Both the relativistic experimental data and the PHOBOS and PHENIX Au+Au data at RHIC energy could be fairly reproduced within the framework of JPCIAE model and without retuning the model parameters. The predictions for collisions at the LHC energy were also given. We computed the participant nucleon distributions using different methods. It was found that the number of participant nucleons is not a well defined variable both experimentally and theoretically. Thus it may be inappropriate to use the charged particle pseudorapidity density per participant pair as a function of the number of participant nucleons for distinguishing various theoretical models.

关键词： charged multiplicity pseudorapidity density number of participant nucleons string fragmentation JPCIAE model

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A review of chatter vibration research in milling

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Chinese Journal of Aeronautics 2019年第2期32卷 215-242页

作者： caixu YUE Haining GAO Xianli LIU Steven Y.LIANG Lihui wang Harbin University of Science and Technology Georgia Institute of Technology KTH Royal Institute of Technology

Chatter is a self-excited vibration of parts in machining systems. It is widely present across a range of cutting processes, and has an impact upon both efficiency and quality in production processing. A great deal of research has been dedicated to the development of technologies that are able to predict and detect chatter. The purpose of these technologies is to facilitate the avoidance of chatter during cutting processes, which leads to better surface precision, higher productivity,and longer tool life. This paper summarizes the current state of the art in research regarding the problems of how to arrive at stable chatter prediction, chatter identification, and chatter control/-suppression, with a focus on milling processes. Particular focus is placed on the theoretical relationship between cutting chatter and process damping, tool runout, and gyroscopic effect, as well as the importance of this for chatter prediction. The paper concludes with some reflections regarding possible directions for future research in this field.

关键词： Chatter Gyroscopic effects Milling Process damping Tool runout

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