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of PCM is 12.7% at 10 min and 40.8% at 95 min compared to those without ultrasound. As for the ultrasonic frequency, under the influence of cavitation frequency and attenuation effect of sound pressure, the increase of the ultrasonic frequency does not necessarily result in the increase of the enhancement. As the ultrasonic frequency increases from 20 kHz to 28 kHz and 40 kHz, the complete melting......
simulation study on ultrasonic tomography for grouted reinforced concrete by finite elementZHU Zi-qiang(朱自强)1, YU Bo(喻波)1, 2, LI Ya-nan(李亚楠)1, XIAO Jia-ying(肖嘉莹)1, ZHOU Yong(周勇)1, 3(1. School... in frequency domain is presented to monitor the grouting defects in reinforced concrete structures. In this algorithm, a hybrid regularizations-based iterative Newton method is implemented to provide stable......
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Effect of ultrasonic on structure and electrochemical performance of α-Ni(OH)2 electrodes ZHANG Zhong-ju, ZHU Yan-juan, BAO Jie, ZHOU Zhuo-jun, YE Xian-cong, XU Qing-sheng School of Physics... ultrasonic co-precipitation method (Sample B) or co-precipitation method (Sample A). The crystal structure and particle size distribution of the prepared samples were examined by X-ray diffraction (XRD......
Trans. Nonferrous Met. Soc. China 20(2010) s1029-s1032 SiC nanoparticles reinforced magnesium matrix composites fabricated by ultrasonic method WANG Zhao-hui(王朝辉), WANG Xu-dong(王旭东... nanoparticles reinforced magnesium matrix composites were fabricated by ultrasonic method. The AZ91 alloy and SiC nanoparticles with the average diameter of 50 nm were used as the matrix alloy......
of the probe; α is the attenuation coefficient which is related to the ultrasonic frequency and medium properties. It is accepted that the vibration and acoustic pressure of melt will weaken along...Trans. Nonferrous Met. Soc. China 23(2013) 3242-3248 Overflowing phenomenon during ultrasonic treatment in Al-Si alloys Yu-bo ZHANG, Yi-ping LU, Jin-chuan JIE, Ying FU, De-shui ZHONG, Ting-ju LI......
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Third-order active-RC complex filter with automatic frequency tuning for ZigBee transceiver applicationsLI Di(李迪)1, JING Zhan(井站)1, YANG Yin-tang(杨银堂)1, WU Xiao-feng(吴笑峰)2, SHI Zuo-chen(石佐辰)1, LIU... MHz bandwidth with a centre frequency of 2 MHz which was required by the ZigBee transceiver applications. An automatic frequency tuning scheme was also designed to accommodate the performance......
Evolution of domain structure and frequency effect on ferroelectric properties in BIT ferroelectrics ZHENG Xue-jun(郑学军)1, 2, LU Jia(卢佳)1, ZHOU Yi-chun(周益春)1,2, WU Bo(吴波)1, CHEN Yi-qiang... for Bi4Ti3O12 (BIT) ferroelectric single crystal under an applied electric field. In the static electric energy induced by an applied alternating electric field, the effects of field frequency......
J. Cent. South Univ. (2016) 23: 1682-1689 DOI: 10.1007/s11771-016-3222-x Rolling element bearing instantaneous rotational frequency estimation based on EMD soft-thresholding denoising and instantaneous fault characteristic frequency ZHAO De-zun(赵德尊), LI Jian-yong(李建勇), CHENG Wei-dong(程卫东), WANG Tian-yang(王天杨), WEN Wei-gang(温伟刚) School of Mechanical Electronic and Control Engineering, Beijing......
