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Bending Analysis of Circular Piezoelectric Semiconductor Plates Incorporating Flexoelectricity

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ACTA MECHANICA SOLIDA SINICA 2024年第4期37卷 613-621页

作者： Sun, Liang xiao, zhengguang Zhang, Chunli Chen, Weiqiu Zhejiang Univ Dept Engn Mech Hangzhou 310027 Peoples R China Naval Univ Engn Dept Basic Courses Wuhan 430033 Peoples R China Huanjiang Lab Zhuji 311816 Peoples R China

Based on the three-dimensional (3D) basic equations of piezoelectric semiconductors (PSs), we establish a two-dimensional (2D) deformation-polarization-carrier coupling bending model for PS structures, taking flexoelectricity into consideration. The analytical solutions to classical flexure of a clamped circular PS thin plate are derived. With the derived analytical model, we numerically investigate the distributions of electromechanical fields and the concentration of electrons in the circular PS thin plate under an upward concentrated force. The effect of flexoelectricity on the multi-field coupling responses of the circular PS plate is studied. The obtained results provide theoretical guidance for the design of novel PS devices.

关键词： Piezoelectric semiconductor Plate model Flexoelectricity Multi-field coupling CARRIER DISTRIBUTION PIEZOTRONICS NANOWIRE

Prediction and Output Estimation of Pattern Moving in Non-Newtonian Mechanical Systems Based on Probability Density Evolution

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Computer Modeling in Engineering & Sciences 2024年第4期139卷 515-536页

作者： Cheng Han zhengguang Xu School of Automation and Electrical Engineering University of Science and Technology BeijingBeijing100083China Key Laboratory of Knowledge Automation for Industrial Processes University of Science and Technology BeijingBeijing100083China

A prediction framework based on the evolution of pattern motion probability density is proposed for the output prediction and estimation problem of non-Newtonian mechanical systems,assuming that the system satisfies the generalized Lipschitz *** a complex nonlinear system primarily governed by statistical laws rather than Newtonian mechanics,the output of non-Newtonian mechanics systems is difficult to describe through deterministic variables such as state variables,which poses difficulties in predicting and estimating the system’s *** this article,the temporal variation of the system is described by constructing pattern category variables,which are non-deterministic *** pattern category variables have statistical attributes but not operational attributes,operational attributes are assigned to them by posterior probability density,and a method for analyzing their motion laws using probability density evolution is ***,a data-driven form of pattern motion probabilistic density evolution prediction method is designed by combining pseudo partial derivative(PPD),achieving prediction of the probability density satisfying the system’s output *** on this,the final prediction estimation of the system’s output value is realized by minimum variance unbiased ***,a corresponding PPD estimation algorithm is designed using an extended state observer(ESO)to estimate the parameters to be estimated in the proposed prediction *** effectiveness of the parameter estimation algorithm and prediction method is demonstrated through theoretical analysis,and the accuracy of the algorithm is verified by two numerical simulation examples.

关键词： Non-newtonian mechanical systems prediction and estimation pattern moving probability density evolution pseudo partial derivative

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“西南巨儒”莫友芝对黔地茶文化的历史贡献

农业考古 2021年第2期 118-121页

作者：肖正广贵州安顺茶文化

生于贵州黔南独山县的清代"西南巨儒"莫友芝才华横溢,一生著述颇丰,同郑珍合撰的《遵义府志》,茶史资料丰富,填补贵州茶史记载空白;撰写的茶诗反映茶事生活状态,表现对茶农的关怀;茶联集取于唐诗宋词,并革故鼎新,另辟蹊径。总之,于历史... 详细信息

生于贵州黔南独山县的清代"西南巨儒"莫友芝才华横溢,一生著述颇丰,同郑珍合撰的《遵义府志》,茶史资料丰富,填补贵州茶史记载空白;撰写的茶诗反映茶事生活状态,表现对茶农的关怀;茶联集取于唐诗宋词,并革故鼎新,另辟蹊径。总之,于历史、文化方面,他为贵州茶文化的发展做出了重要的历史贡献。

关键词：莫友芝黔地茶诗茶联茶文化历史贡献

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A Mode-switching Strategy of Droop Control for VSC-MTDC Systems Considering Maximum DC Voltage Regulation Capability

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CSEE Journal of Power and Energy Systems 2024年第3期10卷 903-912页

作者： Yizhen Wang Fengliang Qiu Zhongguan Wang Yirun Ji zhengguang Chen Chengshan Wang Key Laboratory of Smart Grid of Ministry of Education Tianjin UniversityTianjin 300072China Electric Power Research Institute of State Grid JiBei Electric Power Co.Ltd. Beijing 100045China State Grid Corporation of China Beijing 100031China IEEE

To achieve the goal of carbon neutrality,renewable energy integration through a voltage source converter based multi-terminal direct current(VSC-MTDC)system has been identified as a promising *** tackle the significant DC voltage over-limit problem in a VSC-MTDC system during disturbances,this paper proposes a mode-switching strategy of droop control considering maximum DC voltage regulation *** close relationship between node injection powers and node DC voltages in the MTDC system is elaborated,and the most effective regulation approach of local injection power for limiting DC voltage deviation is *** operating point trajectories of different droop control explains that the DC voltage deviation can be minimized by fully utilizing the capacity of ***,the mode-switching strategy with the maximum DC voltage regulation capability is realized by the switching between the voltage droop control and the constant maximum power *** addition,a mode recovery process and a smooth switching method are developed to make converters regain the capability of maintaining DC voltage and reduce power fluctuation during mode switching,***,three cases are investigated to verify the effectiveness of the proposed mode-switching *** with simulation results of the conventional droop control and the DC voltage deviation-dependent droop control,better performance of transient and steady-state DC voltage deviation is achieved through the proposed strategy.

关键词： Droop control maximum DC voltage regulation capability mode-switching VSC-MTDC

A Design of 2-Stage Voltage Ramp-Up SRAM Physical Unclonable Function

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Chinese Journal of Electronics 2024年第2期33卷 371-379页

作者： Minte SONG Nan LIU Shuaiyang ZHOU zhengguang WANG Zhanqiang RU Peng DING Wei HUANG Helun SONG School of Nano-Tech and Nano-Bionics University of Science and Technology of China Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences

Silicon physical unclonable function（PUF） implemented by static random access memory（SRAM）exists inherent demerit of unstable cells due to noise of environment and circuits, which significantly restricts its reproducibility. In this paper, a 16T SRAM cell with reset-delay circuit and a 2-stage voltage ramp up is fabricated and reported. Compared to conventional SRAM structure, each PUF cell adds a pair of pull-up PMOS（P-channel metal oxide semiconductor） and pull-down NMOS（N-channel metal oxide semiconductor） controlled by reset and delayedreset signals respectively, resulting in two positive feedback stages with different amplification coefficients when the voltage is ramped up. PUF array consists of 4064 cells, 322 dummy cells and a group of 8 series-connected inverters with an area of 304 μm × 650 μm to match the digital post-processing module. PUF test chip was fabricated in HHGrace 110 nm platform with total area 1140 × 1140 μm2. The average HDintra（intra-chip Hamming distance, also bit error rate, BER） and HDinter（inter-chip Hamming distance） values of the 50 PUF chips in SOP16 package measured at normal point（1.5 V/25 ℃） were 1.92% and 49.85%, respectively.

关键词： Semiconductor device measurement Circuits Bit error rate Metals Aging Physical unclonable function Reproducibility of results

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宋明点茶技艺及其特征探析

农业考古 2020年第5期 31-34页

作者：肖正广安徽农业大学茶与食品科技学院

宋元时期至明代初年,是我国点茶道发展的高峰期,尤以两宋为典范。茶之为饮,常被审评以鉴别优劣。基于此,本文针对该时段发展的点茶习茶程序进行了概括总结,并从茶叶的色、香、味、形出发,进而分析了点茶中所需茶、水、火、器、人、境等... 详细信息

宋元时期至明代初年,是我国点茶道发展的高峰期,尤以两宋为典范。茶之为饮,常被审评以鉴别优劣。基于此,本文针对该时段发展的点茶习茶程序进行了概括总结,并从茶叶的色、香、味、形出发,进而分析了点茶中所需茶、水、火、器、人、境等要求及其相关特征。

关键词：两宋点茶技艺特征

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中华茶文化的和谐意蕴初探

农业考古 2019年第5期 21-24页

作者：肖正广安徽农业大学茶与食品科技学院

中国是茶的故乡,茶文化是中国传统文化的重要组成部分,内含儒、道、释三家的思想,是物质文明和精神文明的有机结合,具有广泛的人文和谐意蕴,不仅可以丰富人的内在涵养,提高人的文化素质,亦有助于营造和睦的家庭、社会环境。文章概述了... 详细信息

中国是茶的故乡,茶文化是中国传统文化的重要组成部分,内含儒、道、释三家的思想,是物质文明和精神文明的有机结合,具有广泛的人文和谐意蕴,不仅可以丰富人的内在涵养,提高人的文化素质,亦有助于营造和睦的家庭、社会环境。文章概述了茶文化的和谐意蕴,分析了茶文化中的茶与境和、与器和、与人和、与水和等“和合”之象。

关键词：茶茶文化和谐意蕴精神

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