Nanotechnology and Precision Engineering最新文献_第10页

Analysis of Vibrational Performance of A Piezoelectric Micropump with Diffuse/Nozzle Microchannel 扩散/喷嘴微通道压电微泵的振动性能分析

Nanotechnology and Precision Engineering Pub Date : 2018-06-01 DOI: 10.13494/j.npe.20170014

Yanfang Guan, Xiang Li

{"title":"Analysis of Vibrational Performance of A Piezoelectric Micropump with Diffuse/Nozzle Microchannel","authors":"Yanfang Guan, Xiang Li","doi":"10.13494/j.npe.20170014","DOIUrl":"10.13494/j.npe.20170014","url":null,"abstract":"<div><p>Piezoelectric transducers of different external diameters are designed and fabricated and incorporated into micropumps. Through finite element analysis, it is shown that the volume efficiency of the micropump reaches its maximum value for the first mode of vibration. The variation of maximum displacement with frequency is determined under free and forced vibration. Results demonstrate that this variation shows the same trend for different driving waves at the same driving voltage. The maximum displacement under forced vibration is less than that under free vibration. The displacement increases with decreasing distance from the center of the transducer. The maximum displacement is inversely proportional to the diameter of the transducer and proportional to the driving voltage under both free and forced vibrations. Finally, the micropump flow rate and pressure are measured and are found to manifest the same trend as the maximum displacement under the same driving conditions. For a piezoelectric transducer of 12 mm external diameter, the maximum flow rate and pressure value are 150 μL/min and 346 Pa, respectively, under sine-wave driving at 100 Vpp driving voltage.</p></div>","PeriodicalId":87330,"journal":{"name":"Nanotechnology and Precision Engineering","volume":"1 2","pages":"Pages 138-144"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.13494/j.npe.20170014","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45482904","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Tribological Performance of Bioimplants: A Comprehensive Review 生物植入物的摩擦学性能综述

Nanotechnology and Precision Engineering Pub Date : 2018-06-01 DOI: 10.13494/j.npe.20180003

Gang Shen , Fengzhou Fang , Chengwei Kang

{"title":"Tribological Performance of Bioimplants: A Comprehensive Review","authors":"Gang Shen , Fengzhou Fang , Chengwei Kang","doi":"10.13494/j.npe.20180003","DOIUrl":"10.13494/j.npe.20180003","url":null,"abstract":"<div><p>Total joint replacements (TJR) have been a huge success for orthopaedic surgery in the past century and are gaining increasing importance today due to the aging population. However, the short longevity of artificial joints is one of the major problems in bioimplant industry and needs to be rectified since an increasing number of young people, with more active lifestyles, must receive TJR. Wear mechanisms are discussed in this paper to describe the root causes of the failures and to give some general ideas to increase the lifespan of artificial joints. The suitable material combination is of great importance for the wear resistance of bioimplants, and bio-ceramics will exert a crucial effect in their future progress. Other materials, such as metal alloys and polymers, are also discussed in this paper. Surface finish is another factor affecting the tribological performance of bioimplants. In recent years, surface texture technology has fascinated many researchers, and a good design of texture pattern requires a comprehensive understanding of wear mechanisms, material properties, and dynamic fluid theory. This review also covers a summary of in vitro wear tests, including simulators, lubricant, and testing parameters.</p></div>","PeriodicalId":87330,"journal":{"name":"Nanotechnology and Precision Engineering","volume":"1 2","pages":"Pages 107-122"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.13494/j.npe.20180003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47946982","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 33

Active-Thermal-Tunable Terahertz Absorber with Temperature-Sensitive Material Thin Film 具有温度敏感材料薄膜的有源热可调谐太赫兹吸收体

Nanotechnology and Precision Engineering Pub Date : 2018-06-01 DOI: 10.13494/j.npe.20180008

Zhao Zhang , Zhen Tian , Chao Chang , Xueguang Wang , Xueqian Zhang , Chunmei Ouyang , Jianqiang Gu , Jiaguang Han , Weili Zhang

{"title":"Active-Thermal-Tunable Terahertz Absorber with Temperature-Sensitive Material Thin Film","authors":"Zhao Zhang , Zhen Tian , Chao Chang , Xueguang Wang , Xueqian Zhang , Chunmei Ouyang , Jianqiang Gu , Jiaguang Han , Weili Zhang","doi":"10.13494/j.npe.20180008","DOIUrl":"10.13494/j.npe.20180008","url":null,"abstract":"ABSTRACT It is shown that active-tunable terahertz absorbers can be realized in a sandwich-structured system comprising an ultrathin dielectric film (polyimide) on a temperature-sensitive substrate (InSb) with a metal film on the back by utilizing the intrinsic carrier density (N) variation in InSb. When increasing the temperature from 250 to 320 K, N in InSb varied from ~ 5.50 × 1015 to ~ 2.98 × 1016 cm-3. Fixing the thickness of dielectric film with the value of 1.37 μm, the absorption peak shifted from 1.41 to 3.29 THz while keeping absorption higher than 99%. This active tunability can respond to even a slight temperature perturbation, and shows polarization insensitivity as well as high tolerance of incidence-angle (absorption peak can still exceed 90% even the incidence angle reaches 60°). Besides, the refractive index of polyimide (PI) has thermal stability at the terahertz range and the merit of good workability. These characteristics guarantee the stability of active-tunable performance. The peculiarities and innovations of this proposal promise a wide range of high efficiency terahertz devices, such as thermal sensors, spatial light modulators (SLMs) and so on.","PeriodicalId":87330,"journal":{"name":"Nanotechnology and Precision Engineering","volume":"1 2","pages":"Pages 123-128"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.13494/j.npe.20180008","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47747094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Electrostatic Actuating Bendable Flat Electrode for Micro Electrochemical Machining 微电化学加工用静电驱动可弯曲平板电极

Nanotechnology and Precision Engineering Pub Date : 2018-06-01 DOI: 10.13494/j.npe.20180006

Ruining Huang, Xiaokun Zhu

{"title":"Electrostatic Actuating Bendable Flat Electrode for Micro Electrochemical Machining","authors":"Ruining Huang, Xiaokun Zhu","doi":"10.13494/j.npe.20180006","DOIUrl":"10.13494/j.npe.20180006","url":null,"abstract":"<div><p>In micro-electrochemical machining (μECM), material dissolution takes place at very close vicinity of tool electrode due to localization of electric field. Controlling the gap between tool electrode and workpiece is the key to μECM. Therefore, a new method is proposed to solve a variety of problems in small gap control. In the present context, experiments were carried out with an indigenously developed setup to fabricate cylindrical arrays. During the machining process, the flat electrode bends due to electrostatic force in pulse on-time, which self-adaptively narrows the gap between the electrode and the workpiece. The workpiece material will be removed once the gap meets the processing condition. Therefore, this method has advantages of reducing dependence on high precision machine tools and of avoiding complex servo control. The flat electrode quickly restores to its original condition when it is in pulse off-time, making the gap much larger than that in traditional electrochemical machining (ECM). The large gap benefits debris removing, which improves the machining accuracy. The influence of different experimental parameters on accuracy and efficiency during the machining process has been investigated. It is observed that with the increase in applied voltage or concentration of electrolyte, the material removal rate and the process gap both increase. The detailed analysis of the experimental results is described in this paper.</p></div>","PeriodicalId":87330,"journal":{"name":"Nanotechnology and Precision Engineering","volume":"1 2","pages":"Pages 133-137"},"PeriodicalIF":0.0,"publicationDate":"2018-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.13494/j.npe.20180006","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43702879","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

An E-type Temperature Sensor for Upper Air Meteorology 高空气象用e型温度传感器

Nanotechnology and Precision Engineering Pub Date : 2018-06-01 DOI: 10.13494/j.npe.20170016

Shangbang Han , Qingquan Liu , Xu Han , Wei Dai , Jie Yang

引用次数: 7

A Simple Stable Inertial Nanopositioner with Piezoelectric Stacks 一种具有压电堆的简单稳定惯性纳米逆变器

Nanotechnology and Precision Engineering Pub Date : 2018-03-01 DOI: 10.13494/j.npe.20170023

Pang Zongqiang, Zhang Yue, Zhou Zeqing, Rong Zhou

引用次数: 0

Effect of Surfactants in Aqueous Solutions on Oil-Resisting Performance of Membrane Surfaces with Charges by Atomic Force Microscopy 水溶液中表面活性剂对带电荷膜表面耐油性能的影响

Nanotechnology and Precision Engineering Pub Date : 2018-03-01 DOI: 10.13494/j.npe.20170022

Hu Xiaodong , Han Jing , Xu Linyan , Qian Shuangbei , Guo Tong , Wu Sen , Liu Yanan , Jiang Zhongyi

{"title":"Effect of Surfactants in Aqueous Solutions on Oil-Resisting Performance of Membrane Surfaces with Charges by Atomic Force Microscopy","authors":"Hu Xiaodong , Han Jing , Xu Linyan , Qian Shuangbei , Guo Tong , Wu Sen , Liu Yanan , Jiang Zhongyi","doi":"10.13494/j.npe.20170022","DOIUrl":"10.13494/j.npe.20170022","url":null,"abstract":"<div><p>The state of the surface of oil droplet can be changed obviously by adding a small amount of surfactant in water. The oil-resisting performance of membranes for water/oil separation has a significant influence on filtration efficiency and life span. The atomic force microscope (AFM) is commonly utilized to explore interface interaction. In this paper, the probe modified by an oil (hexadecane) droplet was used as a force sensor to detect adhesion forces between oil and the charged membranes in fluid. Under low concentration of cationic surfactant in water, the adhesion between oil and the nanofiltration (NF) membrane with negative charges was intensified, increasing from 91.04 nN in pure water to 152.33 nN. On the contrary, the low concentration of anionic surfactant resulted in lower adhesion, which decreased from 5.10 nN in pure water to 3.13 nN in this situation. The measured force behavior agreed well with experimental observation from contact angle measurement. However, the high percentage of ionic active agent caused lower interaction in the above two cases. Moreover, the effect of the nonionic active agent on the adhesion between oil and two kinds of charged membranes was also discussed. Results show that the interaction would be weakened with the aid of the nonionic active agent in water, regardless of the positive or negative charges on the membrane surface.</p></div>","PeriodicalId":87330,"journal":{"name":"Nanotechnology and Precision Engineering","volume":"1 1","pages":"Pages 9-15"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.13494/j.npe.20170022","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45285917","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Numerical Simulation of the Effect of Gravitational Direction on Particle Deposition in Pulmonary Acinus under the Condition of Breath Holding 屏气条件下重力方向对肺腺泡颗粒沉积影响的数值模拟

Nanotechnology and Precision Engineering Pub Date : 2018-03-01 DOI: 10.13494/j.npe.20170003

Wu Tao, Zhang Hongyan, Cui Haihang

{"title":"Numerical Simulation of the Effect of Gravitational Direction on Particle Deposition in Pulmonary Acinus under the Condition of Breath Holding","authors":"Wu Tao, Zhang Hongyan, Cui Haihang","doi":"10.13494/j.npe.20170003","DOIUrl":"10.13494/j.npe.20170003","url":null,"abstract":"<div><p>A two-dimensional CFD simulation is conducted to study the effect of the gravitational direction on particle deposition in pulmonary acinus when the breath is held for a short time. The results show that for the large particles (particle diameters of 1 μm, 2 μm, and 3 μm), gravity is the dominant force, and for the small particles (particle diameter of 0.01 μm), the Brownian force is significant. Under the action of either force, the deposition time of particles is short and an equilibrium state can be reached quickly. However, for the medium-sized particles (particle diameters of 0.1 μm and 0.5 μm), the deposition time of particles is elongated because both gravity and Brownian force become weak. Meanwhile, the directions of applied gravity relative to the pulmonary acinus affect the deposition zone of these particles. Therefore, the gravitational direction has no effect on the total deposition fraction of the pulmonary acinus, but can change the local deposition fraction. Applying gravity along the +<em>x</em> direction would increase the local deposition fraction in some specific generations in comparison with the situation along the –<em>y</em> direction. The present study can provide a reliable theoretical basis for further studies on pulmonary mass transport and inhalation therapy.</p></div>","PeriodicalId":87330,"journal":{"name":"Nanotechnology and Precision Engineering","volume":"1 1","pages":"Pages 66-72"},"PeriodicalIF":0.0,"publicationDate":"2018-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.13494/j.npe.20170003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46207270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Time Domain Subdivision Method for Optical Grating Signal Based on Time Series Analysis 基于时间序列分析的光栅信号时域细分方法

Nanotechnology and Precision Engineering Pub Date : 2018-03-01 DOI: 10.13494/j.npe.20170041

Wang Baozhu , Li Wenjuan , Peng Kai , Wang Qiang , Li Meili

引用次数: 2