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Research on Dynamic and Static Test Methods for Evaluating the Poisson's Ratio of Orien ted Strand Board

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Journal of Renewable Materials 2022年第12期10卷 3459-3476页

作者： yuhao zhou Yuhang He Zhaoyu Shen Zheng Wang College of Materals Science and Engineering Nanjing Forestry University Nanjing 210037China

In this article,dynamic method and static method of testing Poisson's ratio of OSB(Oriented Strand Board)were *** modal and static numerical analyses,the position where the transverse stress is equal to zero was *** binary linear regression method was applied to express the gluing position of the strain gauge as a relational express ion that depended on the length-width ratio and width-thickness ratio of the canti-lever *** the longitudinal and transverse Poisson's ratios of OSB were mea sured by the given dynamic and static *** addition,the test results of OSB Poisson's ratio were analyzed with the probability distribution of random *** results showed that using the proposed dynamic method and static method,the test results for longitudinal and transverse Poisson's ratios of OSB were quite consistent,despite the gluing position of the strain gauges being *** these OSB Poisson's ratios were accorded with that obtained by the axial tensile method and the four-point bending *** longitudinal and transverse Poisson's ratios followed Weibull distribution.

关键词： OSB Poisson's ratio cantilever plate dynamic test static test

Observation of the Hydrogen-Dislocation Interactions in a High-Manganese Steel after Hydrogen Adsorption and Desorption

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Acta Metallurgica Sinica(English Letters) 2023年第7期36卷 1105-1112页

作者： Dayong An yuhao zhou Yao Xiao Xinxi Liu Xifeng Li Jun Chen Department of Plasticity Technology School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200030China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an710072China

Hydrogen embrittlement(HE)poses a significant challenge for the development of high-strength metallic ***,explanations for the observed HE phenomena are still under *** shed light on this issue,here we investigated the hydrogen-defect interaction by comparing the dislocation structure evolution after hydrogen adsorption and desorption in a Fe-28Mn-0.3C(wt%)twinning-induced plasticity steel with an austenitic structure using in situ electron channeling contrast *** results indicate that hydrogen can strongly affect dislocation *** detail,hydrogen can promote the formation of stacking faults with a long dissociation ***,dislocation movements are frequently observed during hydrogen *** required resolved shear stress is considered to be the residual stresses rendered by hydrogen ***,the microstructural heterogeneity could lead to the discrepancy of dislocation activities even within the same materials.

关键词： Hydrogen embrittlement Stacking fault Dislocation movement High-manganese steel Electron channeling contrast imaging(ECCI)

Acoustics Performance Research and Analysis of Light Timber Construction Wall Elements Based on Helmholtz Metasurface

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Journal of Renewable Materials 2022年第11期10卷 2791-2803页

作者： Si Chen yuhao zhou Sarah Mohrmann Haiyan Fu Yuying Zou Zheng Wang Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources College of Materials Science and TechnologyNanjing Forestry UniversityNanjing210037China College of Civil Engineering Nanjing Forestry UniversityNanjing210037China

Based on the efficient sound absorption characteristics of Helmholtz resonance structures in the range of medium and low frequency acoustic waves,this paper investigates an effective solution for light timber construction walls with acoustic *** study takes the light timber construction wall structure as the research *** on the Helmholtz resonance principle,the structure design of the wall unit,impedance tube experiment and COMSOL MULTIPHYSICS simulation calculation were carried out to obtain the change rule of acoustic performance of the Helmholtz resonance wall unit *** research results show that the overall stability of sound insulation of the structure is improved,and the frequency range with sound transmission loss more than 50 dB in the experimental group is 640–1600 Hz,while in the control group is 500–906 Hz and 1238–1600 Hz;the sound absorption performance of the structure is obviously better than that of the ordinary structure,especially in the low frequency acoustic wave range of 100–320 Hz,the sound absorption coefficient of the experimental group is more than 0.49,while the sound absorption coefficient of the control group is less than *** is expected that these results will contribute to the optimization of the acoustic performance of light timber construction walls and have high application and popularization value.

关键词： Acoustic metasurface aperture embedded helmholtz resonance structure light timber construction low frequency

Influence of residual chirality on the conformation and enzymatic degradation of glycopolypeptide based biomaterials

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Science China(Technological Sciences) 2021年第3期64卷 641-650页

作者： SHI Shun WANG JiaYu WANG TianRan REN Hui zhou yuhao LI Gao HE ChaoLiang CHEN XueSi CAS Key Laboratory of Polymer Ecomaterials Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China College of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei 230026China Jilin Biomedical Polymers Engineering Laboratory Changchun 130022China

Glycopolypeptides as analogs of glycoproteins or glycosaminoglycans represent attractive building blocks for the construction of biomimetic ***,the effects of amino acid chirality on the conformation and enzymatic degradation of glycopolypeptides are often ***,we synthesized and characterized a range of glycopolypeptides composed of galactosylated poly(γ-propargylglutamate)s containing L-and/or D-glutamate *** containing pure Lglutamate residues were predominantlyα-helical,and the helicity increased over the degree of polymerization of the polypeptide backbones(24 to 44).The glycopolypeptide with pure D-glutamate residues adopted a mirroredα-helical conformation,whilst apparent random coil conformation was observed for the glycopolypeptide with equally mixed enantiomeric *** enzymatic degradation rates of the glycopolypeptides were markedly reduced following the introduction of D-glutamate residues into *** pendants on these glycopolypeptides maintained their binding to peanut *** structureproperty relationships provide new insight for the design of biomimetic biomaterials containing glycopolypeptides.

关键词： glycopolypeptides secondary structures enzymatic degradation chirality lectin binding

A Data-driven Method for Fast AC Optimal Power Flow Solutions via Deep Reinforcement Learning

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Journal of Modern Power Systems and Clean Energy 2020年第6期8卷 1128-1139页

作者： yuhao zhou Bei Zhang Chunlei Xu Tu Lan Ruisheng Diao Di Shi Zhiwei Wang Wei-Jen Lee IEEE the Electrical Engineering Department University of Texas at ArlingtonTX 76019USA GEIRI North America San JoseCA 95134USA State Grid Jiangsu Electric Power Company NanjingChina

With the increasing penetration of renewable energy,power grid operators are observing both fast and large fluctuations in power and voltage profiles on a daily *** and accurate control actions derived in real time are vital to ensure system security and *** this end,solving alternating current(AC)optimal power flow(OPF)with operational constraints remains an important yet challenging optimization problem for secure and economic operation of the power *** paper adopts a novel method to derive fast OPF solutions using state-of-the-art deep reinforcement learning(DRL)algorithm,which can greatly assist power grid operators in making rapid and effective *** presented method adopts imitation learning to generate initial weights for the neural network(NN),and a proximal policy optimization algorithm to train and test stable and robust artificial intelligence(AI)*** and testing procedures are conducted on the IEEE 14-bus and the Illinois 200-bus *** results show the effectiveness of the method with significant potential for assisting power grid operators in real-time operations.

关键词： Alternating current(AC)optimal power flow(OPF) deep reinforcement learning(DRL) imitation learning proximal policy optimization

An Efficient and Fast Area Optimization Approach for Mixed Polarity Reed-Muller Logic Circuits

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Chinese Journal of Electronics 2024年第5期33卷 1165-1180页

作者： yuhao zhou Zhenxue HE Jianhui JIANG Xiaojun ZHAO Fan ZHANG Limin XIAO Xiang WANG School of Software Engineering Tongji University Key Laboratory of Agricultural Big Data of Hebei Province Hebei Agricultural University School of Computer Science and Engineering Beihang University School of Electronic and Information Engineering Beihang University

Area has become one of the main bottlenecks restricting the development of integrated circuits. The area optimization approaches of existing XNOR/OR-based mixed polarity Reed-Muller(MPRM) circuits have poor optimization effect and efficiency. Given that the area optimization of MPRM logic circuits is a combinatorial optimization problem, we propose a whole annealing adaptive bacterial foraging algorithm(WAA-BFA), which includes individual evolution based on Markov chain and Metropolis acceptance criteria, and individual mutation based on adaptive probability. To address the issue of low conversion efficiency in existing polarity conversion approaches, we introduce a fast polarity conversion algorithm(FPCA). Moreover, we present an MPRM circuits area optimization approach that uses the FPCA and WAA-BFA to search for the best polarity corresponding to the minimum circuits area. Experimental results demonstrate that the proposed MPRM circuits area optimization approach is effective and can be used as a promising EDA tool.

关键词： Integrated circuits Microorganisms Annealing Logic circuits Circuits Benchmark testing Delays

A drug-loaded flexible substrate improves the performance of conformal cortical electrodes

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Bio-Design and Manufacturing 2024年第4期7卷 399-412页

作者： Rongrong Qin Tian Li Yifu Tan Fanqi Sun yuhao zhou Ronghao Lv Xiaoli You Bowen Ji Peng Li Wei Huang Frontiers Science Center for Flexible Electronics(FSCFE) Xi’an Institute of Flexible Electronics(IFE)and Xi’an Institute of Biomedical Materials&Engineering(IBME)Northwestern Polytechnical UniversityXi’an 710072China Unmanned System Research Institute Northwestern Polytechnical UniversityXi’an 710072China Ministry of Education Key Laboratory of Micro and Nano Systems for Aerospace School of Mechanical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Key Laboratory of Flexible Electronics of Zhejiang Province Ningbo Institute of Northwestern Polytechnical UniversityNingbo 315103China

Cortical electrodes are a powerful tool for the stimulation and/or recording of electrical activity in the nervous ***,the inevitable wound caused by surgical implantation of electrodes presents bacterial infection and inflammatory reaction risks associated with foreign body ***,inflammation of the wound area can dramatically worsen in response to bacterial *** consequences can not only lead to the failure of cortical electrode implantation but also threaten the lives of ***,we prepared a hydrogel made of bacterial cellulose(BC),a flexible substrate for cortical electrodes,and further loaded antibiotic tetracycline(TC)and the anti-inflammatory drug dexamethasone(DEX)onto *** encapsulated drugs can be released from the BC hydrogel and effectively inhibit the growth of Gram-negative and Gram-positive ***,therapeutic cortical electrodes were developed by integrating the drug-loaded BC hydrogel and nine-channel serpentine arrays;these were used to record electrocorticography(ECoG)signals in a rat *** to the controlled release of TC and DEX from the BC hydrogel substrate,therapeutic cortical electrodes can alleviate or prevent symptoms associated with the bacterial infection and inflammation of brain *** approach facilitates the development of drug delivery electrodes for resolving complications caused by implantable electrodes.

关键词： Antibacterial Anti-inflammatory Drug loading Cortical electrodes Bacterial cellulose hydrogel

Recent advances in wireless epicortical and intracortical neuronal recording systems

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Science China(Information Sciences) 2022年第4期65卷 5-22页

作者： Bowen JI Zekai LIANG Xichen YUAN Honglai XU Minghao WANG Erwei YIN Zhejun GUO Longchun WANG yuhao zhou Huicheng FENG Honglong CHANG Jingquan LIU Unmanned System Research Institute Northwestern Polytechnical University Ministry of Education Key Laboratory of Micro and Nano Systems for Aerospace School of Mechanical EngineeringNorthwestern Polytechnical University Collaborative Innovation Center of Northwestern Polytechnical University NEURACLE TECH (China) Co. Ltd. College of Electronics and Information Hangzhou Dianzi University Defense Innovation Institute Academy of Military Sciences (AMS) Tianjin Artificial Intelligence Innovation Center (TAIIC) National Key Laboratory of Science and Technology on Micro/Nano Fabrication Department of Micro/Nano ElectronicsShanghai Jiao Tong University

An implantable brain-computer interface(BCI) has proven to be effective in the field of sensory and motor function restoration and in the treatment of neurological disorders. Using a BCI recording system,we can transform current methods of human interaction with machines and the environment, especially to help those with cognitive and mobility disabilities regain mobility and reintegrate into society. However,most reported work has focused on a simple aspect of the whole system, such as electrodes, circuits, or data transmission, and only a very small percentage of systems are wireless. A miniature, lightweight, wireless,implantable microsystem is key to realizing long-term, real-time, and stable monitoring on freely moving animals or humans in their natural conditions. Here, we summarize typical wireless recording systems, from recording electrodes, processing chips and controllers, wireless data transmission, and power supply to the system-level package for either epicortical electrocorticogram(ECo G) or intracortical local field potentials(LFPs)/spike acquisition, developed in recent years. Finally, we conclude with our vision of challenges in next-generation wireless neuronal recording systems for chronic and safe applications.

关键词： wireless implant neuronal recording system recording electrodes processing chips wireless data transmission power supply system-level package

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Brainmask:an ultrasoft and moist microelectrocorticography electrode for accurate positioning and long-lasting recordings

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Microsystems & Nanoengineering 2023年第5期9卷 295-307页

作者： Bowen Ji Fanqi Sun Jiecheng Guo yuhao zhou Xiaoli You Ye Fan Longchun Wang Mengfei Xu Wen Zeng Jingquan Liu Minghao Wang Huijing Hu Honglong Chang Unmanned System Research Institute Northwestern Polytechnical UniversityXi’an 710072China Ministry of Education Key Laboratory of Micro and Nano Systems for Aerospace School of Mechanical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Collaborative Innovation Center of Northwestern Polytechnical University Shanghai 201108China Institute of Medical Research Northwestern Polytechnical UniversityXi’an 710072China College of Electronics and Information Hangzhou Dianzi UniversityHangzhou 310018China National Key Laboratory of Science and Technology on Micro/Nano Fabrication Department of Micro/Nano ElectronicsShanghai Jiao Tong UniversityShanghai 200240China

Bacterial cellulose(BC),a natural biomaterial synthesized by bacteria,has a unique structure of a cellulose nanofiberweaved three-dimensional reticulated *** films can be ultrasoft with sufficient mechanical strength,strong water absorption and moisture retention and have been widely used in facial *** films have the potential to be applied to implantable neural interfaces due to their conformality and moisture,which are two critical issues for traditional polymer or silicone *** this work,we propose a micro-electrocorticography(micro-ECoG)electrode named“Brainmask”,which comprises a BC film as the substrate and separated multichannel parylene-C microelectrodes bonded on the top *** can not only guarantee the precise position of microelectrode sites attached to any nonplanar epidural surface but also improve the long-lasting signal quality during acute implantation with an exposed cranial window for at least one hour,as well as the in vivo recording validated for one *** novel ultrasoft and moist device stands as a next-generation neural interface regardless of complex surface or time of duration.

关键词： recording electrode moisture