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High piezoelectricity by multiphase coexisting point: Barium titanate derivatives

MRS Bulletin 2018年第8期43卷 595-599页

作者： Gao, Jinghui Ke, Xiaoqin Acosta, Matias Glaum, Julia Ren, Xiaobing State Key Lab. of Elec. Insulation and Pwr. Equip. and Multidisciplinary Materials Research Center Frontier Institute of Science and Technology Xi'An Jiaotong University China Frontier Institute of Science and Technology State Key Laboratory for Mechanical Behavior of Materials Xi'An Jiaotong University China University of Cambridge United Kingdom Department of Materials Science and Engineering Norwegian University of Science and Technology Norway Frontier Institute of Science and Technology Xi'An Jiaotong University China Center for Advanced Functional Materials National Institute for Materials Science Japan

BaTiO3-based lead-free piezoelectric materials have long been known as a mediocre class of piezoelectric materials. However, they have seen significant renewed interest in recent years ever since the discovery of high piezoelectricity in Ba(Zr, Ti)O3-(Ba, Ca)TiO3 as well as the related Ba(Sn, Ti)O3-(Ba, Ca)TiO3 and Ba(Hf, Ti)O3-(Ba, Ca)TiO3 systems. The unexpectedly high piezoelectricity in this class of BaTiO3 (BT)-based materials is still not well understood and has stimulated significant research activity. We present a concise discussion of the notions leading to high piezoelectricity in BaTiO3-based systems. In particular, the possible role of a multiphase-coexisting point is highlighted. © Copyright Materials Research Society 2018.

关键词： Piezoelectricity

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A method for in vivo detection of abnormal subepidermal tissues based on dielectric properties

A method for in vivo detection of abnormal subepidermal tiss...

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作者： Zhang, Liang Liu, Peiguo Dong, Xiuzhen Zhou, Dongming Shi, Xuetao College of Science National University of Defense Technology Changsha Hunan410073 China State Key Lab. of Complex Electromagnetic Environ. Effects on Electronics and Information System National University of Defense Technology Changsha Hunan410073 China Faculty of Biomedical Engineering Fourth Military Medical University Xi'an Shaanxi710032 China

In this paper, a convenient and noninvasive scanning imaging method using microwave frequency band for abnormal subepidermal tissues detection is proposed in the aim to improve diagnosis and prognosis in clinical environments. This method is based on the reflective detection technology with coaxial probe that is used to measure the dielectric properties of tissues. An improved equivalent circuit and simulated annealing algorithm (SA) were used in this work to analyze the dielectric properties of tissues. Computational simulations incorporating a simplified model of subcutaneous hemorrhage described in this work were used to evaluate this method. The dielectric properties data of tissues in the model of simulation is derived from the literature. The simulation results demonstrated the potential of this method to detect abnormal subepidermal tissues conveniently and expose them in the image accurately. © 2014 - IOS Press and the authors.

关键词： Tissue

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Effect of Cu addition in Sn-containing solder joints on interfacial reactions with Au foils

Effect of Cu addition in Sn-containing solder joints on inte...

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2009 International Conference on Electronic Packaging technology and High Density Packaging, ICEPT-HDP 2009

作者： Wei, Liu Chunqing, Wang Lining, Sun Yanhong, Tian Yarong, Chen Department of Electronics Packaging Technology State Key Lab. of Advanced Welding Production Technology 436# Harbin Institute of Technology Harbin 150001 China Mechanical Engineering Post-Doctoral Mobile Research Station 436# Harbin Institute of Technology 92 West Dazhi Street Harbin 150001 China

ISBN: (纸本)9781424446599

Pure Sn, Sn-0.7Cu, Sn-1.5Cu and Sn-3.0Cu solder joints were fabricated by a laser reflow soldering method, and then they were aged at 125C for various periods. After 600 hours treatment, we found that thickness of Intermetallic Compounds (IMCs) in the pure Sn solder joints was 54m. However, in the solder joints with Cu addition, formation of AuSn4 IMCs was inhibited, and other two kinds of Sn-Cu-Au ternary phases were found in stead. In the Sn-3.0Cu solder joints, the IMCs and phases were only 34m in thickness, moreover, growth of the IMCs and phases did not follow the parabolic law. ©2009 IEEE.

关键词： Lead-free solders

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Advances in synthetic aperture radar micro-motion target indication (SAR/MMTI)

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Tien Tzu Hsueh Pao/Acta Electronica Sinica 2013年第12期41卷 2436-2442页

作者： Deng, Bin Wu, Cheng-Guang Qin, Yu-Liang Li, Xiang Wang, Hong-Qiang State Key Lab. of Complex Electromagnetic Environment Effects on Electronics and Information Syst. Changsha Hunan 410073 China School of Electronic Science and Engineering National University of Defense Technology Changsha Hunan 410073 China

Target micro-motion conveys vital information which is favorable for understanding synthetic aperture radar (SAR) images. However, image defocusing also ensues. Therefore, techniques on micro-motion effect analysis, micro-motion target detection and imaging are gaining more and more attentions in the remote sensing field. These techniques are generally named SAR/micro-motion target indication (SAR/MMTI). In this paper, topics on SAR/MMTI are introduced including its concept, key difficulties, existing experiments, processing approaches, and its application promise. Some directions of future work on SAR micro-motion are predicted at last.

关键词： Synthetic aperture radar

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Power flow unsolvable cases adjustment method based on grid static voltage stability

Power flow unsolvable cases adjustment method based on grid ...

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International Conference on advanced Power System Automation and Protection (APAP)

作者： Feng Hong Jinfu Chen Jian Zuo State Key Laboratory of Advanced Electromagnetic Engineering and Technology Electrical Power Security and High Efficiency Lab Huazhong University of Science and technology 430074 Wuhan China

The unsolvable power flow problem is one of the basic issues in dispatching automation, which frequently appears in the process of grid mode planning and Optimal Power Flow (OPF) analysis. To deal with this problem, a practical adjustment method based on grid weak point is proposed in this paper. This method use “lower power injection” method to calculate a similar power flow solution which also the system maximum load level in unsolvable case. According this solution, the system weak point can be found by the index based on local system operation parameters and external equivalent system model. Combined with sensitivity analysis to reschedule the active power of generators and reactive power compensation devices, so as to make the system maximum load level increase, eventually get the system power flow solution at the original load level. This method overcome the large calculation of optimize algorithm in unsolvable power flow problem and can be applied to large practical grid. In the meantime, this method has clear physical interpretation, operator can be involved during the process, have great value in application. The method is tested on IEEE14 nods system.

关键词： Gold IP networks Generators Sensitivity Robustness

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Preparation of a wafer-level micro polymer lens array with improved performance using a low cost glass mold

Preparation of a wafer-level micro polymer lens array with i...

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46th Annual IMAPS International Symposium on Microelectronics, IMAPS 2013

作者： Ma, Mengying Qin, Shunjin Shang, Jintang Zhang, Chunwei Zhang, Li Chen, Dong Lai, Chiming Key Lab. of MEMS of Ministry of Education Southeast University Nanjing 210096 China State Key Laboratory of Transducer Technology Chinese Academy of Sciences China Jiangyin Changdian Advanced Packaging Co. Ltd. Jiangyin China School of Mechanical Engineering Southeast University China

ISBN: (纸本)9781629938240

In our work, polymer-based micro lens arrays with spacers were innovativly fabricated by low cost wafer-level glass-silicon molds. The upper glass mold was prepared by a well-controlled hot forming process (HFP) combined with a chemical foaming process (CFP). The under silicon mold was formed by an etching process. Before dispensing UV-curable glue between the two concave molds, the contact surface should be coated with an anti-stick layer. After UV curing and de-molding, the micro lens arrays were successfully fabricated. The lenses were inspected by an atomic force microscope(AFM), a white light interferometer and a beam analyzer. The results demonstrate the excellent quality of surface roughness and optical characteristics. This study indicates the potential of this novel molding process for industrial production.

关键词： Molds

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Particle size control of silver nanoparticles prepared by pulsed wire discharge in liquid media

Particle size control of silver nanoparticles prepared by pu...

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International Symposium on Multifunctional Ceramic Materials Based on Nanotechnology, ISMCN 2010

作者： Tokoi, Y. Josho, K. Izuari, Y.M. Suzuki, T. Nakayama, T. Suematsu, H. Lee, W. Fu, Z. Niihara, K. Extreme Energy-Density Research Institute Nagaoka University of Technology Niigata 940-2188 Japan Department of Environmental Engineering Sun Moon University Chungnam 336-708 Korea Republic of State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Silver nanoparticles were prepared by pulsed wire discharge (PWD) using silver wire in deionized water at various relative energy (K) from 10 to 98, which is ratio of the charged energy of the capacitor in the electrical circuit to the vaporization energy of the wire. From energy deposition calculated by the measured voltage and current waveforms, deposited energy of the wire was increased with increasing K. From X-ray diffraction (XRD) analysis, prepared nanoparticles were phase identified as silver. From transmission electron microscopy observations, the shape of prepared silver nanoparticles were spherical and the median particle diameter (D50) and the geometric standard deviation (σg) were calculated from the particle distribution. D50 was decreased from 34 to 19 nm with increasing K. The particle size in prepared by PWD in liquid media can be controlled by K.

关键词： Silver nanoparticles

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Residual stress relaxation of cubic boron nitride thin films deposited in Ar with other noble gases

Residual stress relaxation of cubic boron nitride thin films...

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International Symposium on Multifunctional Ceramic Materials Based on Nanotechnology, ISMCN 2010

作者： Ohori, T. Shirahata, J. Suzuki, T. Nakayama, T. Suematsu, H. Lee, S.W. Fu, Z. Niihara, K. Extreme Energy-Density Research Institute Nagaoka University of Technology Niigata 940-2188 Japan Department of Environmental Engineering Sun Moon University Chungnam 336-708 Korea Republic of State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

A novel method based on radio frequency magnetron sputtering tailored to the deposition of low residual stress and adherent c-BN thin films on silicon substrates was developed. In this study, the effect of noble gas (Kr, Ar, Ne and He) added in Ar gas during sputtering on the residual stress and the c-BN content has been investigated. As a result, it was found that the residual stress of c-BN thin film decreased with increasing the helium gas flow rate within argon gas.

关键词： Residual stresses

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Acoustic analysis using edge-based smoothed finite element method: Time and frequency domain analysis

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Zhendong yu Chongji/Journal of Vibration and Shock 2012年第16期31卷 122-127页

作者： He, Zhi-Cheng Li, Guang-Yao Cheng, Ai-Guo Zhong, Zhi-Hua Zhou, Ze State Key Lab. of Advanced Technology for Vehicle Body Design and Manufacture Hunan University Changsha 410082 China Department of Mechanical Engineering National University of Singapore 117576 Singapore Singapore

The standard finite element method (FEM) encounters two kinds of errors in the computational acoustic problems: the conventional interpolation error and the dispersion error, the later of which plays an important role in the computational acoustics. The dispersion error is rooted at the "overly-stiff" property of the FEM. In order to control the dispersion error, the most effective measure is to make the numerical model reflect the exact model. An edge-based smoothed finite element method (ES-FEM) was adopted for acoustic problems both in frequency domain and time domain. By using only triangular mesh which is very adaptive for any complicated domain and introducing gradient smoothing operation performed over each edge-based smoothed domain, the present method can reduce the stiffness and provide proper "softness" to the model. The results demonstrate that the ES-FEM can provide more accurate solution both in time and frequency domain compared with the linear FEM using the same meshes.

关键词： Finite element method

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Characteristics and in vitro biological assessment of (Ti, O, N)/Ti composite coating formed on NiTi shape memory alloy

Characteristics and in vitro biological assessment of (Ti, O...

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作者： Sun, Tao Wang, Lang-Ping Wang, Min Tong, Ho-Wang Lu, William W. Department of Mechanical Engineering University of Hong Kong Pokfulam Road Hong Kong Hong Kong State Key Lab. of Advanced Welding Production Technology Harbin Institute of Technology China Department of Orthopedics and Traumatology University of Hong Kong Sassoon Road Hong Kong Hong Kong

In this investigation, plasma immersion ion implantation and deposition (PIIID) was used to fabricate a (Ti, O, N)/Ti coating on NiTi shape memory alloy (SMA) to improve its long-term biocompatibility and wear resistance. The surface morphology, composition and roughness of uncoated and coated NiTi SMA samples were examined. Energy dispersive X-ray elemental mapping of cross-sections of (Ti, O, N)/Ti coated NiTi SMA revealed that Ni was depleted from the surface of coated samples. No Ni was detected by X-ray photoelectron spectroscopy on the surface of coated samples. Furthermore, three-point bending tests showed that the composite coating could undergo large deformation without cracking or delamination. After 1 day cell culture, SaOS-2 cells on coated samples spread better than those on uncoated NiTi SMA samples. The proliferation of SaOS-2 cells on coated samples was significantly higher at day 3 and day 7 of cell culture. © 2011 Elsevier B.V. All rights reserved.

关键词： Cell culture

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