The Experts below are selected from a list of 300 Experts worldwide ranked by ideXlab platform
H. F. Tiersten - One of the best experts on this subject based on the ideXlab platform.
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On the thickness expansion of the electric potential in the determination of two-dimensional equations for the vibration of electroded piezoelectric plates
Journal of Applied Physics, 2002Co-Authors: H. F. TierstenAbstract:In the derivation of two-dimensional equations for the vibration of piezoelectric plates from variational equations, expansions of the mechanical and electrical variables in the thickness coordinate are employed. If the major surfaces of the plate are electroded and the electric potential is expanded in functions of the thickness coordinate which do not vanish at the Electrodes, the variations of the different orders of the expansion potentials are not independent because the electric potential must satisfy constraint conditions at the Electrodes where it is independent of position. In this work, the electric potential is expanded in functions of the thickness coordinate which do not vanish at the surface Electrodes and the constraint conditions are included by means of the method of Lagrange multipliers. The resulting piezoelectric plate equations are obtained along with an integral condition on the Lagrange multipliers over the Electrodes, which results in the equation for the current through the Electrodes. It is shown that the elimination of the Lagrange multipliers results in a reduced system of electrostatic plate equations and associated edge conditions, which is easier to use.
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On the thickness expansion of the electric potential in the determination of two-dimensional equations for the vibration of electroded piezoelectric plates
Journal of Applied Physics, 2002Co-Authors: H. F. TierstenAbstract:In the derivation of two-dimensional equations for the vibration of piezoelectric plates from variational equations, expansions of the mechanical and electrical variables in the thickness coordinate are employed. If the major surfaces of the plate are electroded and the electric potential is expanded in functions of the thickness coordinate which do not vanish at the Electrodes, the variations of the different orders of the expansion potentials are not independent because the electric potential must satisfy constraint conditions at the Electrodes where it is independent of position. In this work, the electric potential is expanded in functions of the thickness coordinate which do not vanish at the surface Electrodes and the constraint conditions are included by means of the method of Lagrange multipliers. The resulting piezoelectric plate equations are obtained along with an integral condition on the Lagrange multipliers over the Electrodes, which results in the equation for the current through the electr...
Wang Yan-su - One of the best experts on this subject based on the ideXlab platform.
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Study on graphite rod electrode for all vanadium redox flow battery
Chinese Journal of Power Sources, 2012Co-Authors: Wang Yan-suAbstract:In this report,the different brands of wasted battery's graphite rod Electrodes were used as working Electrodes to study the electrochemistry performance with the circulation voltammetry method.The effects of the scanning velocity and times were investigated to examine the electrode's tolerance of voltage and electric current and the electric discharge performance.The results show that the 5#D graphite rod electrode has a tolerance of 1.65 V.In the same scanning potential range,the charge/discharge performance of large current was studied at different scanning speeds.The experiment proves that the 5#D graphite rod electrode still shows good electrochemical properties.In order to inspect the cyclic properties,the 5#D graphite rod electrode was tested with the circulation voltammetry method.After 100 times of scanning,the current conservation rate of the 5#D graphite electrode was still as high as 95%.The experiment results show that the 5#D graphite rod electrode has a relatively better electrochemistry performance which is suitable for the VO2+/VO2+electrode's positive electrode material.
Lijun Shen - One of the best experts on this subject based on the ideXlab platform.
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the effect of electrode on the thickness shear resonance frequency of piezoelectric crystal plates and resonator design
International Frequency Control Symposium, 2003Co-Authors: Ji Wang, Lijun ShenAbstract:The determination of the precise thickness-shear frequency of electroded crystal plates have practical importance in quartz crystal resonator design and fabrication, especially when the high fundamental thickness-shear frequency has reduced the thickness of crystal plate to such a degree that the proper consideration of the effect of Electrodes has been very important. The Electrodes effect as mass loading in the estimation of the resonance frequency has to be modified to consider the stiffness of Electrodes, as the relative strength is increasingly noticeable. By following a standard procedure in the determination of the thickness-shear frequency of an infinite AT-cut crystal plate, frequency equations of crystal plate without and with piezoelectric effect are obtained in terms of electrode elastic constants and density. Solving these equations for the usual design parameters of crystal resonators, the design process can be optimized to pin point to the precise configuration to avoid time-consuming trial steps. Since these equations and solutions are presented for widely used materials and parameters, they can be easily integrated into the existing crystal resonator design and manufacturing processes.
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the effect of electrode stiffness on the thickness shear resonance frequency of piezoelectric crystal plates
2003Co-Authors: Ji Wang, Lijun ShenAbstract:The determination of the precise thickness-shear frequency of electroded crystal plates have practical importance in quartz crystal resonator design and fabrication, especially when the high fundamental thickness-shear frequency has reduced the thickness of crystal plate to such a degree that the proper consideration of the effect of Electrodes have been very important. The Electrodes effect as mass loading in the estimation of the resonance frequency has to be modified to consider the stiffness of Electrodes, as the relative strength is increasingly noticeable. By following a standard procedure in the determination of the thickness-shear frequency of an infinite AT-cut crystal plate, frequency equations of crystal plate without and with piezoelectric effect are obtained in terms of electrode elastic constants and density. Solving these equations for the usual design parameters of crystal resonators, the manufacturing process can be optimized to pin point to the precise configuration to avoid time-consuming trial steps. Since these equations and solutions are presented for widely used materials and parameters, they can be easily integrated into the existing crystal resonator design and manufacturing processes.
Shen Lijun - One of the best experts on this subject based on the ideXlab platform.
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exact thickness shear resonance frequency of electroded piezoelectric crystal plates
Journal of Zhejiang University Science, 2005Co-Authors: Shen LijunAbstract:The determination of the precise thickness-shear frequency of electroded crystal plates has practical importance in quartz crystal resonator design and fabrication, especially when the high fundamental thickness-shear frequency has reduced the crystal plate thickness to such a degree that proper consideration of the effect of Electrodes is very important. The Electrodes effect as mass loading in the estimation of the resonance frequency has to be modified to consider the stiffness of Electrodes, as the relative strength is increasingly noticeable. By following a known procedure in the determination of the thickness-shear frequency of an infinite AT-cut crystal plate, frequency equations of crystal plate without and with piezoelectric effect are obtained in terms of elastic constants and the electrode material density. After solving these equations for the usual design parameters of crystal resonators, the design process can be optimized to pinpoint the precise configuration to avoid time-consuming trial and reduction steps. Since these equations and solutions are presented for widely used materials and parameters, they can be easily integrated into the existing crystal resonator design and manufacturing processes.
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precise thickness shear resonance frequency of electroded piezoelectric crystal plates and its applications in resonator design
Journal of Ningbo University, 2004Co-Authors: Shen LijunAbstract:The determination of the precise thickness-shear frequency of electroded crystal plates have practical importance in quartz crystal resonator design and fabrication, especially when the high fundamental thickness-shear frequency has reduced the thickness of crystal plate to such a degree that the proper consideration of the effect of Electrodes has been very important. The Electrodes effect as mass loading in the estimation of the resonance frequency has to be modified to consider the stiffness of Electrodes, as the relative strength is increasingly noticeable. By following a known procedure in the determination of the thickness-shear frequency of an infinite AT-cut crystal plate, frequency equations of crystal plate without and with piezoelectric effect are obtained in terms of elastic constants and density of the electrode material. Solving these equations for the usual design parameters of crystal resonators, the design process can be optimized to pin point to the precise configuration to avoid time-consuming trial and reduction steps. Since these equations and solutions are presented for widely used materials and parameters, they can be easily integrated into the existing crystal resonator design and manufacturing processes.
Jianzhong Xiao - One of the best experts on this subject based on the ideXlab platform.
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effects of sintering temperature on the nh3 sensing properties of mg2cu0 25fe1o3 75 electrode for ysz based potentiometric nh3 sensor
Ceramics International, 2016Co-Authors: Chao Wang, Bing Wang, Yu Yuan, Jinqiang Huang, Haibo Zhang, Feng Xia, Jianzhong XiaoAbstract:Abstract Mg 2 Cu 0.25 Fe 1 O 3.75 mixed metal oxides have been synthesized by a co-precipitation method for fabricating NH 3 sensors Electrodes. The sensor Electrodes were sintered at 1000 °C, 1100 °C, 1200 °C, and 1300 °C to obtain different electrode microstructures. The Electrodes were characterized by X-ray diffraction (XRD), the Brunauer–Emmett–Teller (BET) method and Environmental Scanning Electron Microscope (ESEM). NH 3 response performances of the NH 3 sensors to different concentrations of test gases (20–400 ppm NH 3 ) were evaluated at 400 °C. The influences of sintering temperature on the microstructures, NH 3 sensing performances, and electrochemically catalytic activity of Mg 2 Cu 0.25 Fe 1 O 3.75 Electrodes were investigated. The electrode sintered at 1200 °C exhibited the biggest response (about 110 mV for 400 ppm NH 3 ) and the highest NH 3 sensitivity (72 mV/decade NH 3 ) of all the Electrodes. Moreover, the response time and recovery time were within 8–4 s and 8–14 s, respectively. The enhanced NH 3 sensing performances of the Mg 2 Cu 0.25 Fe 1 O 3.75 Electrodes may be attributed to Electrodes׳ larger electrochemically catalytic activity and more quantity of triple-phase boundary (TPB) of the sintered three-dimensional network electrode structure.
