Nami Jishu yu Jingmi Gongcheng/Nanotechnology and Precision Engineering最新文献_第7页

Environmental temperature effect on dimensional measurements of atomic force microscopy 环境温度对原子力显微镜尺寸测量的影响

IF 3.7 3区工程技术

Nami Jishu yu Jingmi Gongcheng/Nanotechnology and Precision Engineering Pub Date : 2021-06-01 DOI: 10.1063/10.0003939

Chengfu Ma, Yuhang Chen, Wenhao Huang

引用次数: 1

Microscratch of copper by a Rockwell C diamond indenter under a constant load 用洛氏C金刚石压头在恒定载荷下对铜进行微划痕

IF 3.7 3区工程技术

Nami Jishu yu Jingmi Gongcheng/Nanotechnology and Precision Engineering Pub Date : 2021-05-28 DOI: 10.1063/10.0005065

Ming Liu

{"title":"Microscratch of copper by a Rockwell C diamond indenter under a constant load","authors":"Ming Liu","doi":"10.1063/10.0005065","DOIUrl":"https://doi.org/10.1063/10.0005065","url":null,"abstract":"The scratch test is used for quality control mostly in phenomenological ways, and whether fracture toughness can be obtained from this test is still a matter of debate requiring further elucidation. In this paper, values of the fracture toughness of copper obtained by different scratch-based approaches are compared in order to examine the applicability of scratch-based methodologies to characterize the fracture toughness of soft metals. The scratch response of copper to a Rockwell C diamond indenter is studied under a constant normal load condition. The variations of penetration depth, residual depth, and residual scratch width with applied normal load are quantified from spherical to sphero-conical contact regimes by piecewise functions. A newly proposed size effect law is found to be the most suitable for scratch-based approaches to characterizing the fracture toughness of soft metallic materials with significant plasticity. A simple expression relating the nominal stress to the penetration depth is proposed for the spherical contact regime and gives almost the same value of fracture toughness. The residual scratch width provides useful information on pile-up of material and on the spherical tip radius of the indenter. It is found that the values of the fracture toughness obtained from the microscratch test are influenced by the data range for analysis.","PeriodicalId":35428,"journal":{"name":"Nami Jishu yu Jingmi Gongcheng/Nanotechnology and Precision Engineering","volume":"4 1","pages":"033003"},"PeriodicalIF":3.7,"publicationDate":"2021-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1063/10.0005065","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41525768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 14

Investigation of the application of a magnetic abrasive finishing process using an alternating magnetic field for finishing micro-grooves 利用交变磁场对微沟槽进行磁磨料精加工的应用研究

IF 3.7 3区工程技术

Nami Jishu yu Jingmi Gongcheng/Nanotechnology and Precision Engineering Pub Date : 2021-05-24 DOI: 10.1063/10.0005015

Huijun Xie, Y. Zou

{"title":"Investigation of the application of a magnetic abrasive finishing process using an alternating magnetic field for finishing micro-grooves","authors":"Huijun Xie, Y. Zou","doi":"10.1063/10.0005015","DOIUrl":"https://doi.org/10.1063/10.0005015","url":null,"abstract":"A magnetic abrasive finishing process using an alternating magnetic field is proposed for the finishing of complex surfaces. In an alternating field, the periodic changes in current will cause the magnetic cluster used as a magnetic brush to fluctuate, which will not only continuously replace the abrasive particles in contact with the workpiece, but also periodically adjust the shape of the magnetic cluster to better fit the surface of the workpiece. In this paper, the influence of a combination of alternating and static magnetic fields on the magnetic field in the finishing area is analyzed. The feasibility of this process for finishing micro-grooves is investigated. Simulations and experimental measurements show that the combination of alternating and static magnetic fields can retain the advantages of the alternating field while increasing the magnetic flux density in the finishing area. The experimental results show that the process is feasible for finishing micro-grooves, with an excellent deburring effect on the groove edges.","PeriodicalId":35428,"journal":{"name":"Nami Jishu yu Jingmi Gongcheng/Nanotechnology and Precision Engineering","volume":"4 1","pages":"033002"},"PeriodicalIF":3.7,"publicationDate":"2021-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1063/10.0005015","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47675715","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Study of corrective abrasive finishing for plane surfaces using magnetic abrasive finishing processes 平面表面磁研磨修正抛光工艺研究

IF 3.7 3区工程技术

Nami Jishu yu Jingmi Gongcheng/Nanotechnology and Precision Engineering Pub Date : 2021-05-17 DOI: 10.1063/10.0004961

Yulong Zhang, Y. Zou

{"title":"Study of corrective abrasive finishing for plane surfaces using magnetic abrasive finishing processes","authors":"Yulong Zhang, Y. Zou","doi":"10.1063/10.0004961","DOIUrl":"https://doi.org/10.1063/10.0004961","url":null,"abstract":"On the basis of ordinary plane magnetic abrasive finishing, a finishing method is proposed that can improve the flatness of a plane workpiece. In this method, the feed speed is varied during finishing according to the profile curve of the initial surface and the material removal efficiency, to control the effective finishing time in different areas and thereby improve the surface flatness. A small magnetic pole with an end face diameter of 1 mm is designed, and a ferromagnetic plate is placed under the workpiece to improve the uniformity of the magnetic field distribution near the magnetic pole. An experiment on an A5052 aluminum alloy plate workpiece shows that after 60 min of finishing using the proposed method, the extreme difference of the workpiece surface can be reduced from 14.317 μm to 2.18 μm, and the standard deviation can be reduced from 3.322 μm to 0.417 μm. At the same time, according to the measurement results, a similar flatness can be achieved at different positions on the finishing area. Thus, the proposed variable-speed finishing method leads to obvious improvements in flatness.","PeriodicalId":35428,"journal":{"name":"Nami Jishu yu Jingmi Gongcheng/Nanotechnology and Precision Engineering","volume":"4 1","pages":"033001"},"PeriodicalIF":3.7,"publicationDate":"2021-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1063/10.0004961","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46007068","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Cutting performance of micro-textured PCBN tool 微织构PCBN刀具的切削性能

IF 3.7 3区工程技术

Nami Jishu yu Jingmi Gongcheng/Nanotechnology and Precision Engineering Pub Date : 2021-04-28 DOI: 10.1063/10.0004372

L. Fan, Zilong Deng, Xingjun Gao, Yan He

{"title":"Cutting performance of micro-textured PCBN tool","authors":"L. Fan, Zilong Deng, Xingjun Gao, Yan He","doi":"10.1063/10.0004372","DOIUrl":"https://doi.org/10.1063/10.0004372","url":null,"abstract":"To study the effect of micro-texture on the cutting performance of polycrystalline cubic boron nitride (PCBN) tools, five types of micro-textures (circular pits, elliptical grooves, transverse grooves, composite grooves, and wavy grooves) were applied to the rake surface of PCBN tools by an optical fiber laser marking machine. Through a combination of three-dimensional cutting simulations and experiments, the influences of micro-texture on chip–tool contact area, cutting force, chip morphology, shear angle, and surface roughness during the cutting process were analyzed. The results indicated that the chip–tool contact area and cutting force of both non-textured and micro-textured tools increased with increasing cutting speed, while the shear angle decreased with increasing cutting speed. The chip–tool contact area and cutting force of the five types of micro-textured tools were smaller than those of the non-textured tool. The chip–tool contact area and cutting force obtained by the wavy-groove micro-textured tool were the smallest. The chip radius produced by the five types of micro-textured tools was smaller than that produced by the non-textured tool, and the chip morphology was more stable. The transverse-groove micro-textured tool had a better chip breaking effect. The chip radius generated by the elliptical-groove micro-textured tool was 0.96 cm, while that generated by the wavy-groove tool varied from 0.55 cm to 1.26 cm. The presence of a micro-texture reduced the surface roughness of the workpiece by 11.73%–56.7%. Under the same cutting conditions, the five types of micro-textured tools gave a smaller chip–tool contact area, cutting force, chip radius, and surface roughness and a larger shear angle than the non-textured tool. In addition, the elliptical-groove and wavy-groove micro-textured tools had better cutting performance.","PeriodicalId":35428,"journal":{"name":"Nami Jishu yu Jingmi Gongcheng/Nanotechnology and Precision Engineering","volume":"4 1","pages":"023004"},"PeriodicalIF":3.7,"publicationDate":"2021-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1063/10.0004372","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45224332","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Review of flexible microelectromechanical system sensors and devices 柔性微机电系统传感器和器件综述

IF 3.7 3区工程技术

Nami Jishu yu Jingmi Gongcheng/Nanotechnology and Precision Engineering Pub Date : 2021-04-27 DOI: 10.1063/10.0004301

Xiaopeng Yang, Menglun Zhang

引用次数: 27

Interfacial stress characterization of GaN epitaxial layer with sapphire substrate by confocal Raman spectroscopy 用共聚焦拉曼光谱分析蓝宝石衬底GaN外延层的界面应力

IF 3.7 3区工程技术

Nami Jishu yu Jingmi Gongcheng/Nanotechnology and Precision Engineering Pub Date : 2021-03-22 DOI: 10.1063/10.0003818

Zengqi Zhang, Zongwei Xu, Ying Song, Tao Liu, Bin Dong, J. Liu, H. Wang

引用次数: 7

Characteristics of Ni-based ohmic contacts on n-type 4H-SiC using different annealing methods 不同退火方法在n型4H-SiC上的Ni基欧姆接触特性

IF 3.7 3区工程技术

Nami Jishu yu Jingmi Gongcheng/Nanotechnology and Precision Engineering Pub Date : 2021-03-15 DOI: 10.1063/10.0003763

Ziwei Zhou, He Weiwei, Zhang Zhenzhong, Sun Jun, A. Schöner, Zedong Zheng

引用次数: 9

On-site low-power sensing nodes for distributed monitoring of heavy metal ions in water 用于分布式监测水中重金属离子的现场低功率传感节点

IF 3.7 3区工程技术

Nami Jishu yu Jingmi Gongcheng/Nanotechnology and Precision Engineering Pub Date : 2021-02-24 DOI: 10.1063/10.0003511

Menglun Zhang, Xi Zhang, Pengfei Niu, Tao Shen, Yi Yuan, Yuantao Bai, Zhilin Wang

{"title":"On-site low-power sensing nodes for distributed monitoring of heavy metal ions in water","authors":"Menglun Zhang, Xi Zhang, Pengfei Niu, Tao Shen, Yi Yuan, Yuantao Bai, Zhilin Wang","doi":"10.1063/10.0003511","DOIUrl":"https://doi.org/10.1063/10.0003511","url":null,"abstract":"Heavy metal pollution in water environments poses a great threat to public health and to the ecological environment due to its high toxicity and non-degradability. However, many existing detection methods require laboratory-based bulky instruments and time-consuming manual operations. Although some on-site systems exist, they are difficult to deploy on a large scale owing to their large size and high cost. Here, we report a sensing node featuring low power consumption and low cost, achieved by integrating microsensor, microfluidic, and electronic modules into a compact size for automatic and scalable heavy metal pollution monitoring. Digital microfluidic and electrochemical sensing modules are integrated on a chip, thereby combining the procedures of sample pretreatment, electrochemical sensing, and waste removal for automatic and continuous monitoring. The feasibility of the platform is demonstrated by Pb2+ detection in tap water. With a 3500 mA·h battery, the compact sensing node could work for several years in principle. There is scope for further improvements to the system in terms of wider functionality and reductions in size, power consumption, and cost. The sensing node presented here is a strong candidate for distributed monitoring of water quality as an Internet-of-Things application.","PeriodicalId":35428,"journal":{"name":"Nami Jishu yu Jingmi Gongcheng/Nanotechnology and Precision Engineering","volume":"4 1","pages":"013005"},"PeriodicalIF":3.7,"publicationDate":"2021-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1063/10.0003511","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45446033","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Design of a hexagonal air-coupled capacitive micromachined ultrasonic transducer for air parametric array 用于空气参数阵列的六角形空气耦合电容式微机械超声换能器的设计

IF 3.7 3区工程技术

Nami Jishu yu Jingmi Gongcheng/Nanotechnology and Precision Engineering Pub Date : 2021-02-22 DOI: 10.1063/10.0003504

Xiaoli Zhang, Hui Zhang, Dachao Li

{"title":"Design of a hexagonal air-coupled capacitive micromachined ultrasonic transducer for air parametric array","authors":"Xiaoli Zhang, Hui Zhang, Dachao Li","doi":"10.1063/10.0003504","DOIUrl":"https://doi.org/10.1063/10.0003504","url":null,"abstract":"An air parametric array can generate a highly directional beam of audible sound in air, which has a wide range of applications in targeted audio delivery. Capacitive micromachined ultrasonic transducer (CMUTs) have great potential for air-coupled applications, mainly because of their low acoustic impedance. In this study, an air-coupled CMUT array is designed as an air parametric array. A hexagonal array is proposed to improve the directivity of the sound generated. A finite element model of the CMUT is established in COMSOL software to facilitate the choice of appropriate structural parameters of the CMUT cell. The CMUT array is then fabricated by a wafer bonding process with high consistency. The performances of the CMUT are tested to verify the accuracy of the finite element analysis. By optimizing the component parameters of the bias-T circuit used for driving the CMUT, DC and AC voltages can be effectively applied to the top and bottom electrodes of the CMUT to provide efficient ultrasound transmission. Finally, the prepared hexagonal array is successfully used to conduct preliminary experiments on its application as an air parametric array.","PeriodicalId":35428,"journal":{"name":"Nami Jishu yu Jingmi Gongcheng/Nanotechnology and Precision Engineering","volume":"4 1","pages":"013004"},"PeriodicalIF":3.7,"publicationDate":"2021-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1063/10.0003504","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42136063","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3