Yumei Wen

Chongqing University, Ch’ung-ch’ing-shih, Chongqing Shi, China

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Publications (101)115.79 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: A packaged current sensor consisting of a SmFe2/PZT/SmFe2 self-biased magnetoelectric (ME) laminate and a Fe73.5Cu1Nb3Si13.5B9 nanocrystalline flux concentrator for weak-current detection at the power-line frequency is fabricated and characterized. The giant magnetostrictive material of the SmFe2 plate with its large anisotropic constant provides a huge internal anisotropic field to bias the ME transducer in a closed magnetic loop. Consequently, the additional magnetomotive force induced by the internal field and the corresponding increased effective permeability contribute to an improvement in sensitivity. Experimental results demonstrate that the presented sensor has a higher sensitivity of 152 mV A−1 at 50 Hz with a slight nonlinearity of ~0.01% FS and matches well with the predicted value. This current-sensing device exhibits approximately 2.3 times higher sensitivity than does conventional ME composite with PZT and Terfenol-D plates serving as the key sensitive component. In addition, the packaged sensor is evaluated for a long period of 72 h to determine stability over time, and the results are analyzed by means of a mathematical statistics method; favorable stability with an uncertainty of 0.5 μV is obtained in continuous 1 h testing. These results represent a significant advancement in the development of promising applications of tri-layer self-biased ME laminate for monitoring power-line electric cords.
    Smart Materials and Structures 08/2014; 23(9):095028. · 2.02 Impact Factor
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    ABSTRACT: A magnetoelectric (ME) vibration energy harvester has been designed to scavenge sufficient energy from ambient vibration with arbitrary motion directions in a plane and over a range of frequencies. In the harvester, a circular-cross-section cantilever rod is adopted to extract the vibration energy due to its ability to host accelerations in arbitrary in-plane motion directions. The magnetic coupling between the magnet and the ME transducer results in nonlinear oscillation of the cantilever rod with increased frequency bandwidth. To achieve optimal vibration energy harvesting performance, the effects of the nonlinear vibration and the harvester parameters including the magnetic circuit and the separation distance on the electrical output and the␣working bandwidth are analyzed. The experimental results show that the harvester can scavenge vibration energy in arbitrary in-plane directions, exhibiting a bandwidth of 4.0 Hz and maximum power of 0.22 mW at acceleration of 0.6g (with g = 9.8 m s−2).
    Journal of Electronic Materials 07/2014; 43(7). · 1.64 Impact Factor
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    ABSTRACT: Low-frequency and resonance magnetoelectric (ME) responses without bias have been studied in a three-phase multilayer ME composite consisting of positive/negative giant magnetostrictive materials (GMMs) Terfenol-D (Tb0.3Dy0.7Fe1.92), Samfenol (SmFe2) plates, and piezoelectric single crystal 0.67PMN-0.33PT [0.67Pb(Mg1/3Nb2/3)O3-0.33PbTiO3]. The large intrinsic anisotropic field with obvious hysteresis and remnant magnetization in SmFe2 plates as well as an exchanging field induced by the differences in magnetic properties of the two GMMs contributes to the self-biased ME responses. The experimental results demonstrate that the output sensitivities without bias for the resonance frequency at 97.5 kHz and the off-resonance frequency at 1 kHz can reach 1.1 V/Oe and 8.7 mV/Oe, respectively. A step change of ac magnetic field as small as ̃2.27 × 10-8 T can be clearly distinguished by the amplitude of the output signals under the resonance frequency of 97.5 kHz. These results provide potential applications for magnetic field detection without bias by utilizing a multilayer ME laminate due to its self-biased, self-powered, and ultra-sensitive properties.
    Journal of Applied Physics 04/2014; 115(17). · 2.21 Impact Factor
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    ABSTRACT: To develop high performance microwave noise suppressor, the microwave noise suppressors based on a microstrip line using FeCoB based magnetic thin film are presented, whose microwave noise suppression effects have been investigated. It was found that suitable low argon pressure is beneficial to the improvement of microwave noise suppression. In addition, the microwave noise suppression properties of microwave noise suppressor could be tuned by controlling the geometric dimension of FeCoB based magnetic thin film and SiO2 dielectric layer, resulted from the ferromagnetic resonance loss and eddy current loss. The maximum power loss ratio (Ploss/Pin) of thin-film microwave noise suppressor (the length, width, and thickness of FeCoNiB thin film are 25 mm, 10 mm, and 250 nm, respectively) achieves 0.75 at 3.4 GHz. These results show that the presented film noise suppressors have potential for the electromagnetic interference design in the GHz frequency range.
    Journal of Applied Physics 04/2014; 115(17). · 2.21 Impact Factor
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    ABSTRACT: A frequency-tunable current sensor consisting of Terfenol-D/PZT/Terfenol-D magnetoelectric (ME) laminate and Fe73.5Cu1Nb3Si13.5B9 nanocrystalline alloy has been developed. Almost all ME current-sensing devices have higher outputs at resonance conditions, but this advantage is useful only for narrow bandwidth. For the purpose of broadband current sensing, a frequency up-conversion mechanism is introduced by means of nonlinearity of the field-dependence magnetostriction λ(H). Current sensitivity enhancement is realized by modulating the low-frequency dynamic magnetostrictive strain to its resonance conditions. This solution provides the possibility to achieve resonance-enhanced sensitivity at the power-line frequency of 50 Hz, and the capability to immune the noise floor. Experimental results show that the modulated sensitivity is increased from 48.6 mV/A to 178.4 mV/A at 50 Hz, and a small current step change of 3 mA can be clearly distinguished by amplitude or phase of the output signals. These results provide possibilities to accurately detect weak currents in the noise ambient at low frequencies.
    Journal of Applied Physics 04/2014; 115(17). · 2.21 Impact Factor
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    ABSTRACT: This paper investigates the dynamic magnetostrictive properties in a laminate ferromagnetic material FeCuNbSiB/Ni (FN) consisting of a Nickel (Ni) plate and the Fe-based nanocrystalline alloy (FeCuNbSiB) foils. The resonant dynamic piezomagnetic coefficient (d33,m) is studied particularly in experiments. The experimental results demonstrate that the d33,m versus DC bias magnetic field data of FN show strong hysteretic and remanent behaviors. The zero-biased d33,m ranges from 5.14 to 42.7 (nm/A), depending on the numbers of FeCuNbSiB layer L. The maximum zero-biased d33,m of FN is 42.7 nm/A for FN with L = 4, which is ̃24.1 times larger than that of Ni. By combining FN with piezoelectric Pb(Zr0.52,Ti0.48)O3 (PZT), a giant zero-biased magnetoelectric voltage coefficient αME of ̃89.2 (V/cm Oe) is observed in composite FN/PZT/FN. Thus, the laminate magnetostrictive layer FN can be used for obtaining a self-biased magnetoelectric composite.
    Journal of Applied Physics 04/2014; 115(17). · 2.21 Impact Factor
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    ABSTRACT: An electric current sensor using piezoelectric ceramic Pb(Zr,Ti)O3 (PZT) sandwiched between two high permeability cuboids and two NdFeB magnets is presented. The magnetic field originating from an electric wire is augmented by the high permeability cuboids. The PZT plate experiences an enhanced magnetic force and generates voltage output. When placed with a distance of d = 5.0 mm from the wire, the sensor shows a flat sensitivity of ∼5.7 mV/A in the frequency range of 30 Hz-80 Hz and an average sensitivity of 5.6 mV/A with highly linear behavior in the current range of 1 A-10 A at 50 Hz.
    The Review of scientific instruments 02/2014; 85(2):026110. · 1.52 Impact Factor
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    ABSTRACT: The commonly used cross-correlation technique for leak location requires that the acoustic speed is known and invariable. In practice, the gas leakage-induced acoustic waves propagate along multiple paths including in-pipe gas and pipe wall, and the acoustic waves in different transmission paths exhibit different acoustic speeds and different dispersive behaviors, which bring a great challenge for leak detection and location in the gas pipelines. In this study, based on the vibration theory of cylindrical elastic thin shell, the wavenumber formulae in different transmission paths are derived to predict the acoustic speeds and the acoustical coupling between the in-pipe gas and the pipe wall is analyzed to determine the dominant transmission path. In addition, the velocity dispersions in the dominant transmission path are suppressed by selection of a characteristic frequency band of the gas leakage-induced acoustic waves. The theoretical predictions are verified in the experiment and the results show that the theoretical acoustic speed is slightly larger than the measured acoustic speed. Thus, the theoretical acoustic speed formula is modified considering the effect of the structural loss factor and consequently the location error using the modified acoustic speed is reduced by two times compared to that using the theoretical acoustic speed.
    The Review of scientific instruments 02/2014; 85(2):024901. · 1.52 Impact Factor
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    ABSTRACT: This paper presents a design for a novel vibration energy harvester using a magnetoelectric (ME) transducer, which is efficiently applicable in two-dimensional (2D) motion and over a range of vibration frequencies. This harvester adopts a circular cross-section cantilever rod to extract the ambient vibration energy because of its ability to host accelerations in arbitrary motion directions. Moreover, the magnetic interactions between the magnets and the ME transducer will lead to the nonlinear oscillation of the rod with increased frequency bandwidth. The influences of the nonlinear vibration factor and magnetic field distribution on the electrical output and bandwidth of the harvester are investigated to achieve optimal vibration energy harvesting performances. The experimental results showed that, the harvester was sensitive to the vibration with arbitrary in-plane directions. With an acceleration of 0.6 g (where g = 9.8 ms−2), it had the working bandwidths of 4.2 Hz, 2.6 Hz, 2.3 Hz, 2.5 Hz and 3.2 Hz, and the output powers of 0.6 mW, 0.49 mW, 0.33 mW, 0.5 mW and 0.56 mW at the in-plane excitation angles of−90°, −45°, 0°, 45° and 90°, respectively.
    Sensors and Actuators A Physical 01/2014; 205:47–52. · 1.84 Impact Factor
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    ABSTRACT: Most vibration energy harvesters use conventional cantilever configuration and typically perform well for a specific frequency at the first resonant mode, this makes the devices less effective in ambient vibrations with varying frequencies. This paper presents a multi-modal vibration energy harvester achieving multiple peaks in the frequency response and causing the possibility of widening the operation frequency range. A spiral-shaped cantilever with tip mass in the form of magnets coupling with a magnetoelectric (ME) transducer is adopted in this harvester. The spiral-shaped beam is shown to be conductive to presenting multi-modal responses and lowering the natural frequencies of the harvester. Furthermore, due to the magnetic coupling between the magnets and the transducer, the peak frequencies are tunable and the frequency spacing between the adjacent modes can be obviously reduced. The operating principle of energy conversion is based on the relative movement of the magnets and the transducer, and the effects of magnetic coupling working on the peak frequencies are experimentally determined. The experimental results indicate that the proposed harvester can obtain five obvious peak values in the range of 15-70 Hz, which are concentrated around 20.7 Hz, 26.1 Hz, 32.3 Hz, 42.2 Hz and 63.7 Hz, respectively.
    Sensors and Actuators A Physical 01/2014; · 1.84 Impact Factor
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    ABSTRACT: We report on a shear-mode off-antiresonance and antiresonance magnetoelectric (ME) responses in Tb0.3Dy0.7Fe1.92/Pb(Zr, Ti)O3/SmFe2 laminate multiferroic heterostructures for magnetic detecting and energy scavenging without bias field. A negative shear force as well as large internal anisotropic field is provided by SmFe2 plate due to its ferromagnetic and magnetostrictive properties, while the Terfenol-D plate provides a positive shear force to invoke a higher shear-stress transfer. Consequently, stronger ME coupling with a value of 2.24 V/Oe is obtained to be generated from the proposed architecture in the absence of the applied dc magnetic field. Experimental results exhibit an approximately linear sensitivity curve under off-antiresonance and antiresonance conditions, and the minimum stepped variations of input ac magnetic field as small as 2.43 × 10−8T can be clearly distinguished under 111.5 kHz. In addition, a maximum power of 0.323 μW with a 2.6MΩ load resistance in series connected to the ME laminate under the conditions of no bias can be achieved. These properties demonstrate that such a miniature multimode ME device is capable of weak magnetic field detecting and spatial magnetic energy scavenging by removing the requirement of dc bias field.
    Sensors and Actuators A Physical 01/2014; · 1.84 Impact Factor
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    ABSTRACT: The correlation-based location methods are widely used in leak detection of the pipelines assuming that the acoustic speed has been known and constant. In practice, the acoustic speed is frequency-varying due to the dispersions of gas-leak-induced acoustic waves, and thus the assumption is not supported. In this work, a location scheme based on cross-time–frequency spectrum (CTFS) is intended for the gas-leak-induced acoustic waves with frequency-varying acoustic speed. In the scheme, the CTFS is obtained by the one-dimensional Fourier transform of the time domain convolution between the kernel function in correlation domain and the instantaneous cross-correlation of the two spatially separately collected acoustic signals on either sides of a leakage. Then, the time difference of arrival (TDOA) and the corresponding frequency information are extracted simultaneously when the CTFS reaches the maximum value. The resulting peak frequency is used to online determine the frequency-dependant acoustic speed in combination with the known dispersive curve of gas-leak-induced dominated mode. Finally, the gas leakage is located by the TDOA and the frequency-dependant acoustic speed of real-time determination instead of constant acoustic speed. Consequently, for the proposed scheme, the constant acoustic speed is no longer a prerequisite. The proposed scheme has been experimentally validated in leak detection of gas pipelines and results demonstrate that the average relative location errors are reduced by six times compared with the commonly used correlation-based location method.
    Journal of Sound and Vibration 01/2014; 333(17):3889–3903. · 1.61 Impact Factor
  • Lei Chen, Ping Li, Yumei Wen, Yong Zhu
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    ABSTRACT: This paper presents a comparison of the resonant magnetoelectric (ME) voltage coefficients for multilayered PZT/FeNi-FACE composites with Fe-based nanocrystalline Fe73.5Cu1Nb3Si13.5B9 alloy (FeCuNbSiB) and without FeCuNbSiB. As the magnetic interaction between FeNi-FACE and FeCuNbSiB produces an internal magnetic field (Hint), it leads to the variation of the total dc magnetic bias and the ME voltage coefficient for multilayered PZT/FeNi-FACE composites with FeCuNbSiB, relative to multilayered PZT/FeNi-FACE composites without FeCuNbSiB. Correspondingly, a high ME voltage coefficient for multilayered PZT/FeNi-FACE composites with FeCuNbSiB at zero can be obtained. Furthermore, as the number of layer increases to 9, the zero-bias ME voltage coefficient first increases, and then decreases. The value of seven-layer composite reaches 5.14 V/Oe, which is about 2.35 times higher than that for three-layer, 1.53 times higher than that for five-layer, and 1.22 times higher than that for nine-layer. Such high performances enable the ME composites to possess an ideal sensing and make them promising for self-bias ME sensor application.
    Journal of Alloys and Compounds 01/2014; 595:87–91. · 2.73 Impact Factor
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    ABSTRACT: An enhancement for magnetoelectric (ME) effects is studied in a three-phase ME architecture consisting of two magnetostrictive Terfenol-D (Tb0.3Dy0.7Fe1.92) plates, a piezoelectric PZT (Pb(Zr,Ti)O3) plate, and a pair of shape-optimized FeCuNbSiB nanocrystalline alloys. By modifying the conventional shape of the magnetic flux concentrator, the shape-optimized flux concentrator has an improved effective permeability (μeff) due to the shape-induced demagnetizing effect at its end surface. The flux concentrator concentrates and amplifies the external magnetic flux into Terfenol-D plate by means of changing its internal flux concentrating manner. Consequently, more flux lines can be uniformly concentrated into Terfenol-D plates. The effective piezomagnetic coefficients (d33m) of Terfenol-D plate and the ME voltage coefficients (αME) can be further improved under a lower magnetic bias field. The dynamic magneto-elastic properties and the effective magnetic induction of Terfenol-D are taken into account to derive the enhanced effective ME voltage coefficients (αME,eff), the consistency of experimental results and theoretical analyses verifies this enhancement. The experimental results demonstrate that the maximum d33m in our proposed architecture achieves 22.48 nm/A under a bias of 114 Oe. The maximum αME in the bias magnetic range 0–900 Oe reaches 84.73 mV/Oe under the low frequency of 1 kHz, and 2.996 V/Oe under the resonance frequency of 102.3 kHz, respectively. It exhibits a 1.43 times larger piezomagnetic coefficient and a 1.87 times higher ME voltage coefficient under a smaller magnetic bias of 82 Oe than those of a conventional Terfenol-D/PZT/Terfenol-D composite. These shape-induced magnetoelectric behaviors provide the possibility of using this ME architecture in ultra-sensitive magnetic sensors.
    Review of Scientific Instruments 01/2014; 85(3):033904-033904-9. · 1.60 Impact Factor
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    ABSTRACT: A five-phase laminate composite transducer based on nanocrystalline soft magnetic FeCuNbSiB alloy is presented, whose magnetoelectric (ME) coupling characteristics have been investigated. It is found that the resonant ME voltage coefficient of FeCuNbSiB/Terfenol-D/Pb(Zr1-x,Tix)O3 (PZT)/Terfenol-D/FeCuNbSiB (FMPMF) five-phase transducer is much larger than that of traditional Terfenol-D/PZT/Terfenol-D (MPM) transducer, resulting from the enhancement of the effective mechanical quality factor and effective piezomagnetic coefficient of the transducers. Appropriate FeCuNbSiB layer thickness is propitious to the resonant and low-frequency ME coupling characteristics. The maximum resonant ME voltage coefficient achieves 4.81 V/Oe with FeCuNbSiB layer thickness is 60 μm under the DC bias magnetic field Hb = 77 Oe, which is 1.48 times as great as that of traditional MPM transducer. In addition, the maximum ME voltage coefficient at low frequency is 51.2 mV/Oe under the DC bias magnetic field Hb = 442 Oe, which is 1.26 times as great as that of traditional MPM transducer. It indicates that the mentioned five-phase laminate composite transducers have great potential for the application of highly sensitive dc magnetic field sensing and vibration energy harvesting.
    Applied Physics Letters 01/2014; 104(11):112401-112401-4. · 3.79 Impact Factor
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    ABSTRACT: A high-efficiency broadband acoustic energy harvester consisting of a compliant-top-plate Helmholtz resonator (HR) and dual piezoelectric cantilever beams is proposed. Due to the high mechanical quality factor of beams and the strong multimode coupling of HR cavity, top plate and beams, the high efficiency in a broad bandwidth is obtained. Experiment exhibits that the proposed harvester at 170–206 Hz has 28–188 times higher efficiency than the conventional harvester using a HR with a piezoelectric composite diaphragm. For input acoustic pressure of 2.0 Pa, the proposed harvester exhibits 0.137–1.43 mW output power corresponding to 0.035–0.36 μW cm−3 volume power density at 170–206 Hz.
    Review of Scientific Instruments 01/2014; 85(6):066103-066103-3. · 1.60 Impact Factor
  • Lei Chen, Ping Li, Yumei Wen, Yong Zhu
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    ABSTRACT: We investigate magnetoelectric (ME) effects in various three-phase laminate composites of FeCuNbSiB/Terfenol-D/PZT(FeMP), FeCuNbSiB/iron–nickel-based ferromagnetic alloy with constant elasticity/PZT(FeFP) and FeCuNbSiB/Ni/PZT(FeNiP). Under the low frequency and resonant frequency condition, various composites exhibit hysteretic ME responses as a function of applied bias field. Both self-biased effect characterized by non-zero ME effect at zero bias and dual-peak ME effect are observed. Especially, self-biased ME properties are remarkably enhanced at resonance. The zero-biased ME coefficient for FeNiP with a high quality factor of 551.79 reaches 10.12 V/Oe (126.625 V/(cm Oe)), which is 4.34 times and 19.84 times larger than those of FeFP (2.33 V/Oe) and FeMP (0.51 V/Oe) composites, respectively. These results provide the possibility of implementing self-biased ME effect in high-sensitivity magnetic-sensing devices.
    Journal of Alloys and Compounds 01/2014; 606:15–20. · 2.73 Impact Factor
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    ABSTRACT: A coupled resonance structure of two sonic crystal resonators with different sizes is proposed to enhance the acoustic wave localization effect. Due to acoustic resonance coupling between sonic crystal resonators, the enhanced acoustic wave localization is observed in the coupled resonance structure, and the cavity pressure is much larger than that in each individual sonic crystal resonator. The experimental results show that the proposed coupled structure exhibits 2.1–3.3 times larger maximum pressure magnification than each individual sonic crystal resonator. This proposed structure can be further used to improve acoustic energy harvesting, acoustic sensing, and sound concentration.
    Applied Physics Letters 01/2014; 104(15):151904-151904-4. · 3.79 Impact Factor
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    ABSTRACT: Tuning band structures of a magneto-mechanical phononic crystal (PnC) (containing elastic plates bonded with magnets) is demonstrated by applying a small static magnetic field (Hdc). Due to magnetic torque effect, the markedly altered coupling between Bragg scattering (related to lattice constants) and local resonances of plates occurs. Consequently, significant tuning of band structures is observed under a greatly small Hdc. Experiments show that an additional passband occurs in band structures when Hdc ≥ 130 Oe. This threshold (130 Oe) is ∼1/100 as large as that of the conventional PnC using magnetostrictive materials. The adjusted maximum of passband bandwidth is 0.57 kHz under 0–600 Oe.
    Applied Physics Letters 01/2014; 105(1):011904-011904-4. · 3.79 Impact Factor
  • Lei Chen, Ping Li, Yumei Wen, Yong Zhu
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    ABSTRACT: The theoretical analysis of magnetoelectric (ME) performance in three-phase Terfenol-D/PZT/FeCuNbSiB (MPF) laminate composite is presented in this paper. The ME couplings at low frequency for ideal and less than ideal interface couplings are studied, respectively, and our analysis predicts that (i) the ME voltage coefficient for ideal interface coupling increases with the increasing layers (n) of Fe-based nanocrystalline ribbon FeCuNbSiB (Fe73.5Cu1Nb3Si13.5B9) while the sizes of PZT (Pb(Zr1-xTix)O3) and Terfenol-D (Tb1-xDyxFe2-y) are kept constant, and then it tends to be a constant when the layers of FeCuNbSiB are >100 (ii) by introducing the interface coupling factor k and considering the degradation of d33m,f with n, the ME voltage coefficient for a less than ideal interface condition is predicted. As the FeCuNbSiB layer increases, it first increases and reaches to a maximum value, and then slowly decreases. Various MPF laminates are fabricated and tested. It is found that the theoretical predictions for the consideration of actual boundary conditions at the interface are in agreement with the experimental observations. This study plays a guiding role for the design of MPF composite in real applications.
    Smart Materials and Structures 11/2013; 22(11):5031-. · 2.02 Impact Factor

Publication Stats

124 Citations
115.79 Total Impact Points

Institutions

  • 1998–2014
    • Chongqing University
      • • School of Opto-Electronic Engineering
      • • Key Laboratory of Optoelectronic Technology and System of the Education Ministry of China
      Ch’ung-ch’ing-shih, Chongqing Shi, China