نتایج جستجو برای: piezoelectric polymeric

تعداد نتایج: 37694  

2015
Yu-Hung Li Sang Jong Kim Nathan Salowitz Fu-Kuo Chang

This paper focuses on the development of the new BiScO3-PbTiO3 (BS-PT) based piezoelectric ceramic transducers for high-temperature SHM applications. By controlling the PbO deficiency in the material system, we modify the lossy ferroelectric properties and enhance the piezoelectric responses from the intrinsic BSPT. The new in-house fabricated piezoelectric transducers can maintain comparably h...

2013
Zhihong Wang Yingbang Yao Xianbin Wang Weisheng Yue Longqing Chen Xi Xiang Zhang

We investigated the dependence of electromechanical coupling and the piezoelectric response of a micromachined Pb(Zr₀.₅₂Ti₀.₄₈)O₃ (PZT) diaphragm on its curvature by observing the impedance spectrum and central deflection responses to a small AC voltage. The curvature of the diaphragm was controlled by applying air pressure to its back. We found that a depolarized flat diaphragm does not initia...

Journal: :journal of mathematical modeling 0
fu shao department of mechanical and industrial engineering, university of toronto, toronto, canada

this paper presents a mathematical model for the vibration analysis of a three-component piezoelectric force sensor. the cubic theory of weakly nonlinear electroelasticity is applied to the model for describing the electromechanical coupling effect in the piezoelectric sensing elements which operate in thickness-shear and thickness-stretch vibration modes. hamilton's principle is used to d...

Journal: :The Journal of clinical investigation 1991
G Apodaca M Bomsel J Arden P P Breitfeld K Tang K E Mostov

Journal: :Journal of bioscience and bioengineering 2013
Shinobu Oda Naoki Sakamoto Hideo Horibe Akihiko Kono Shinichi Ohashi

In a liquid-liquid interface bioreactor, fungal cells locate in a hydrophilic polyacrylonitrile microsphere layer on an aqueous-organic interface. In this article, effects of hydrophobicity of the interface on n-decane hydroxylation activity of Monilliera sp. NAP 00702 was examined. (-)-4-Decanol production was significantly enhanced to 132% by addition of polytetrafluoroethylene.

2015
Yibo Li Zhaohui Liu Yanmei Liu

Piezoelectric ceramic actuators have wide application prospects in precision positioning and measurement technology, but its hysteresis characteristics cause a lot of restrictions to their applications. To solve this problem, this paper summary the hysteresis characteristic of piezoelectric ceramics, and collect the data through the experiment, analyze and research the piezoelectric ceramic hys...

Journal: :Physical review. E, Statistical, nonlinear, and soft matter physics 2002
A Jákli T Tóth-Katona T Scharf M Schadt A Saupe

Pressure-electric (hydrostatic piezoelectric) measurements are reported on bookshelf textures of a ferroelectric smectic-C (Sm C*) liquid crystal with a glass transition. The continuous variation of a partially fluid state to the solid glass enables one to trace how the piezoelectric effect depends on the consistency of the material. It was observed that in the Sm C* samples with poled glass th...

2001
Y. J. Liu H. Fan

A weakly-singular form of the piezoelectric boundary integral equation (BIE) formulation is introduced in this paper, which eliminates the calculation of any singular integrals in the piezoelectric BIE. The crucial question of whether or not the piezoelectric BIE will degenerate when applied to crack and thin shell-like problems is discussed. It can be shown analytically that the conventional B...

2003
B. K. Mukherjee W. Ren

Sensors and actuators based on piezoelectric ceramics are finding an increasingly large variety of applications under a very wide range of environmental conditions and applied signals. Some actuator applications require the piezoelectric materials to support large mechanical loads and produce high strain output. In order to accomplish this requirement of higher strains, large electric fields mu...

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