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Radiation Principle and Spatial Direct Modulation Method of a Low Frequency Antenna Based on Rotating Permanent Magnet

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Chinese Journal of Electronics 2022年第4期31卷 674-682页

作者： liu wenyi ZHANG Feng SUN Faxiao GONG Zhaoqian liu Xiaojun FANG guangyou Aerospace Information Research Institute Chinese Academy of Sciences Key laboratory of Electromagnetic Radiation and Sensing Technology University of Chinese Academy of Sciences

The theory of mechanical antenna is still in its infancy at present, and its radiation mechanism,field distribution, modulation methods and other basic theories need to be explored and improved. The radiation mechanism of a rotating-magnet based mechanical antenna(RMBMA) is explored. An equivalent radiation model of the mechanical antenna is established. The field formula of mechanical antenna is derived using this model and rotation matrix. The spatial direct modulation method of mechanical antenna is also investigated. Two prototype antennas are fabricated using DC/AC servo motors and Nd Fe B magnets, and experiments are carried out to verify the correctness of the derivation and analysis. The measured and simulated results are in consistent with each other. By precisely controlling the moving parameters of an AC servo motor, signal of binary amplitude shift keying(BASK) is generated, and the original code sequence is recovered by demodulation.

关键词： prototype antennas radiation mechanism binary amplitude shift keying Permanent magnets AC servo motor antenna radiation patterns Small and special purpose electric machines modulation methods demodulation servomotors rotation matrix rotating-magnet based mechanical antenna Single antennas Modulation and coding methods rotating permanent magnet amplitude shift keying low frequency antenna permanent magnets radiation principle magnetic fields equivalent radiation model code sequence spatial direct modulation method

Rotational motions of the Ms7.0 Jiuzhaigou earthquake with ground tilt data

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Science China Earth Sciences 2019年第5期62卷 832-842页

作者： Cong ZHOU Xiangzhi ZENG Qingliang WANG wenyi liu Cuizhi WANG The Second Monitoring and Application Center China Earthquake Administration Institute of Geology China Earthquake Administration Institute of Geology Chinese Academy of Geological Sciences

Observation and research of rotational motions induced by earthquake has been ignored in the past decades due to the lack of understanding of important ground rotational motions and practical difficulty involved in directly measuring the rotational components. Currently, there is a paucity of methods to directly measure rotational motions in China. The present study attempts to discuss the possibility of obtaining seismic rotation from ground tilt data. The rotational motions generated by shear dislocation source are derived based on the displacement formula of elastic wavefields in the homogenous space. The characteristics of the three components of translational and rotational motions in near, intermediate, and far fields are compared and analyzed. Based on the corresponding relationship between the rotation and ground tilt on free surface boundary, a method to indirectly construct the rotational motions in the layered half space is obtained. Finally, the theoretical rotational motions generated by the Ms7.0 earthquake in Jiuzhaigou, Sichuan Province, on August 8, 2017 are calculated. The results indicate that the rotational motions generated by the Jiuzhaigou earthquake are concentrated in the vicinity of the epicenter(approximately150 km) and mainly distributed in the area perpendicular to the fault strike. The existence of free surface boundary attenuates the total energy of the rotational field and especially in the direction of the dominant energy. The ground tilt data is compared with rotational motions in the layered half space, and the results indicate that theoretical rotations and actual ground tilt data are essentially consistent, especially in the far field region. Thus, it is possible to obtain horizontal components of rotation from ground tilt data, and this provides more information for a complete description of the motion characteristics of an underground medium.

关键词： Rotational motions Layered half space Jiuzhaigou earthquake Ground tilt Strike slip fault

CRISPR-mediated RNA base editing:a promising strategy to rescue deafness

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Signal Transduction and Targeted Therapy 2023年第3期8卷 883-884页

作者： wenyi liu Min Wu Guanwang Shen Wound Trauma Medical Center State Key Laboratory of TraumaBurns and Combined InjuryDaping HospitalArmy Medical UniversityChongqing400042China Wenzhou Institute University of Chinese Academy of SciencesWenzhouZhejiang325000China Integrative Science Center of Germplasm Creation in Western China(CHONGQING)Science City&Southwest University Biological Science Research CenterSouthwest UniversityChongqing400716China

A recent study published in Science Translational Medicine by Xiao et *** the use of mini dCas13X-based adenosine base editor(mxABE)to correct a mutant transcript and rescued the auditory function of an autosomal domi... 详细信息

关键词： al. auditory Medicine

Synergistic Coupling of Sulfide Electrolyte and Integrated 3D FeS_(2)Electrode Toward Long-Cycling All-Solid-State Lithium Batteries

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Energy & Environmental Materials 2024年第5期7卷 68-76页

作者： wenyi liu Yongzhi Zhao Chengjun Yi Weifei Hu Jiale Xia Yuanyuan Li Jinping liu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China School of Chemistry Chemical Engineering and Life ScienceWuhan University of TechnologyWuhan 430070China School of Integrated Circuits Huazhong University of Science and TechnologyWuhan 430074China

FeS_(2)cathode is promising for all-solid-state lithium batteries due to its ultra-high capacity,low cost,and environmental ***,the poor performances,induced by limited electrode-electrolyte interface,severe volume expansion,and polysulfide shuttle,hinder the application of FeS_(2)in all-solid-state lithium ***,an integrated 3D FeS_(2)electrode with full infiltration of Li6PS5Cl sulfide electrolytes is designed to address these *** a 3D integrated design not only achieves intimate and maximized interfacial contact between electrode and sulfide electrolytes,but also effectively buffers the inner volume change of FeS_(2)and completely eliminates the polysulfide shuttle through direct solid-solid conversion of Li2S/***,the vertical 3D arrays guarantee direct electron transport channels and horizontally shortened ion diffusion paths,endowing the integrated electrode with a remarkably reduced interfacial impedance and enhanced reaction *** from these synergies,the integrated all-solid-state lithium battery exhibits the largest reversible capacity(667 mAh g^(-1)),best rate performance,and highest capacity retention of 82%over 500 cycles at 0.1 C compared to both a liquid battery and non-integrated all-solid-state lithium *** cycling performance is among the best reported for FeS_(2)-based all-solid-state lithium *** work presents an innovative synergistic strategy for designing long-cycling high-energy all-solid-state lithium batteries,which can be readily applied to other battery systems,such as lithium-sulfur batteries.

关键词： 3D electrolyte infiltration all-solid-state batteries FeS_(2)nanosheets arrays integrated 3D electrodes sulfide electrolytes

Binder-free electrodes for advanced potassium-ion batteries:A review

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Chinese Chemical Letters 2021年第4期32卷 1299-1308页

作者： Wencong liu wenyi liu Yuqi Jiang Qiuyue Gui Deliang Ba Yuanyuan Li Jinping liu School of Chemistry Chemical Engineering and Life ScienceState Key Laboratory of Advanced Technology for Materials Synthesis and ProcessingWuhan University of TechnologyWuhan 430070China School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China Key Laboratory for Photonic and Electronic Bandgap Materials Ministry of EducationSchool of Physics and Electronic EngineeringHarbin Normal University.Harbin 150025China

Potassium-ion batteries(PIBs)have attracted enormous attention due to the abundance of potassium resources,low cost,fast ionic conductivity of electrolyte and relatively high operating *** great effo rts and progress,researches on PIBs are still at the initial stage,especially in the emerging field of flexible and wearable *** inevitable challenges for PIBs include low reversible capacity,unsatisfactory cycling stability and insufficient energy density,the solution to which mostly relies on designing adva nced ***-free electrodes have emerged as promising electrode architecture for *** electrodes avoid the use of insulating binders,which can be designed with various synergistic functional materials to address the aforementioned PIB issues and be endowed with flexibility/*** this review,we mainly summarize the recent progress on binde r-free electrodes for PIBs,with the focus on the methodologies,detailed strategies and functional materials for electrode *** strategy for binder-free electrodes is to assemble free-standing architecture with the help of carbon nanotubes(CNTs),graphitic fibers,and other carbon or mechanically robust materials,either alone or in *** other effective strategy is current collector substrate-assisted direct growth,including the use of carbon cloth,*** and other conductive ***,challenges and research opportunities are put forward at the end as the guidance for future development of binder-free PIB devices.

关键词： Binder-free Free-standing electrode Substrate-assisted directly grown electrode Potassium-ion battery Flexible device

Surface-adaptive nanoparticles with near-infrared aggregation-induced emission for image-guided tumor resection

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Science China(Life Sciences) 2019年第11期62卷 1472-1480页

作者： Xiaoyan Zhang Cong Li wenyi liu Hanlin Ou Dan Ding Key Laboratory of Bioactive Materials Ministry of EducationCollege of Life SciencesNankai UniversityTianjin 300071China Tianjin Stomatological Hospital Hospital of StomatologyMedical CollegeNankai UniversityTianjin 300041China Jiangsu Center for the Collaboration and Innovation of Cancer Biotherapy Cancer InstituteXuzhou Medical UniversityXuzhou 221002China

Aggregation-induced emission(AIE)nanoparticles(NPs)are widely used for image-guided tumor resection because of their high signal-to-noise ratios and long systemic circulation *** NPs are derived by encapsulating small-molecule fluorescent dyes with AIE property inside the cores of NPs assembled by amphiphilic *** the systemic circulation of AIE NPs is prolonged,hydrophilic polymer coatings simultaneously decrease the binding and uptake of AIE NPs by tumor *** overcome this problem,surface-adaptive AIE dye-encapsulated mixed-shell micelles(MSMs)with polyethylene glycol/poly(β-amino ester)(PEG/PAE)surfaces were *** to the charge conversion ability of PAE,MSMs demonstrated enhanced cellular uptake by tumor cells in acidic *** addition,compared with single-PEG-shelled micelles(PEGSMs),MSMs exhibited prolonged systemic circulation due to the presence of micro-phase separated ***,due to the coordination effect of enhanced cancer cell uptake and prolonged systemic circulation time,MSMs were more enriched than PEGSMs in the tumor cells and exhibited excellent performance during image-guided tumor resection.

关键词： aggregation-induced emission surface-adaptive enhanced cellular uptake image-guided tumor resection

Electrolyte Concentration Regulation Boosting Zinc Storage Stability of High-Capacity K0.486V2O5 Cathode for Bendable Quasi-Solid-State Zinc Ion Batteries

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Nano-Micro Letters 2021年第2期13卷 232-245页

作者： Linpo Li Shuailei liu Wencong liu Deliang Ba wenyi liu Qiuyue Gui Yao Chen Zuoqi Hu Yuanyuan Li Jinping liu School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074People’s Republic of China School of Chemistry Chemical Engineering and Life Scienceand State Key Laboratory of Advanced Technology for Materials Synthesis and ProcessingWuhan University of TechnologyWuhan 430070People’s Republic of China Key Laboratory for Photonic and Electronic Bandgap Materials Ministry of EducationSchool of Physics and Electronic EngineeringHarbin Normal UniversityHarbin 150025People’s Republic of China

Vanadium-based cathodes have attracted great interest in aqueous zinc ion batteries(AZIBs)due to their large capacities,good rate performance and facile synthesis in large ***,their practical application is greatly hampered by vanadium dissolution issue in conventional dilute ***,taking a new potassium vanadate K0.486V2O5(KVO)cathode with large interlayer spacing(~0.95 nm)and high capacity as an example,we propose that the cycle life of vanadates can be greatly upgraded in AZIBs by regulating the concentration of ZnCl2 electrolyte,but with no need to approach“water-in-salt”*** the optimized moderate concentration of 15 m ZnCl2 electrolyte,the KVO exhibits the best cycling stability with ~95.02% capacity retention after 1400 *** further design a novel sodium carboxymethyl cellulose(CMC)-moderate concentration ZnCl2 gel electrolyte with high ionic conductivity of 10.08 mS cm^-1 for the first time and assemble a quasi-solid-state *** device is bendable with remarkable energy density(268.2 Wh kg^−1),excellent stability(97.35% after 2800 cycles),low self-discharge rate,and good environmental(temperature,pressure)suitability,and is capable of powering small *** device also exhibits good electrochemical performance with high KVO mass loading(5 and 10 mg cm^-2).Our work sheds light on the feasibility of using moderately concentrated electrolyte to address the stability issue of aqueous soluble electrode materials.

关键词： Electrolyte concentration regulation Quasi-solid-state Zn ion battery K0.486V2O5 Large interlayer spacing Cycling stability

A Phase Readout Method for Wireless Passive Sensor Used in Pressure Measurement System

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Chinese Journal of Electronics 2015年第4期24卷 702-708页

作者： HONG Yingping LIANG Ting ZHENG Tingli ZHANG Hairui liu wenyi XIONG Jijun Key Laboratory of Instrumentation Science & Dynamic Measurement Ministry of Education North University of China Science and Technology on Electronic Test & Measurement Laboratory North University of China

A phase difference detection method used for reading the resonant frequency through mutual coupling is designed to meet the pressure measurement in harsh environments, and a testing device of integrated modular by developing the hardware circuits is *** and discussion of the novel theoretical model in the phase readout system is presented, and a pressure test platform based on the phase difference detection is also established, which is to measure the frequency of a LC resonant sensor on the basis of 96% alumina ceramic substrate. The experimental results show that the proposed phase difference readout system presents sweep-frequency detection in the range of 1–100MHz bandwidth, and a high frequency resolution of 0.006 MHz. Sensitivity of the sensor is approximately 0.225 MHz/bar from 1 bar to 2 bar. The accuracy and functionality of the phase readout system have emphasized a wider engineering application range, so that we can make it possible that the wireless passive LC resonant sensor revolves well in practical engineering occasions outside the laboratory environment.

关键词： LC resonant sensor Resonant frequency Phase difference detection Pressure test

Occurrence and infection risk of waterborne pathogens in Wanzhou watershed of the Three Gorges Reservoir, China

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Journal of Environmental Sciences 2013年第9期25卷 1913-1924页

作者： Guosheng Xiao Zhaodan Wang Ji'an Chen Zhiqun Qiu Yanjie Li Junsheng Qi wenyi liu Weiqun Shu Department of Environmental Hygiene School of Military Preventive Medicine Third Military Medical University College of Life Science and Engineering Chongqing Three Gorges University

The Three Gorges Reservoir （TGR）, formed by China＇s Yangtze Three Gorges Project, is the largest lake in the world, but there is too little information available about fecal contamination and waterborne pathogen impacts on this aquatic ecosystem. During two successive 1-year study periods （July 2009 to July 2011）, the water quality in Wanzhou watershed of the TGR was tested with regard to the presence of fecal indicators and pathogens. According to Chinese and World Health Organization water quality standards, water quality in the mainstream was good but poor in backwater areas. Salmonella, Enterohemorrhagic Escherichia coli （EHEC）, Giardia and Cryptosporidium were detected in the watershed. Prevalence and concentrations of the pathogens in the mainstream were lower than those in backwater areas. The estimated risk of infection with Salmonella, EHEC, Cryptosporidium, and Giardia per exposure event ranged from 2.9 × 10 -7 to 1.68 × 10-5 , 7.04 × 10-10 to 2.36 × 10-7 , 5.39 × 10-6 to 1.25 × 10-4 and 0 to 1.2 × 10-3 , respectively, for occupational divers and recreational swimmers exposed to the waters. The estimated risk of infection at exposure to the 95% upper confidence limit concentrations of Salmonella, Cryptosporidium and Giardia may be up to 2.62 × 10-5 , 2.55 × 10-4 and 2.86 × 10-3 , respectively. This study provides useful information for the residents, health care workers and managers to improve the safety of surface water and reduce the risk of fecal contamination in the TGR.

关键词： the Three Gorges Reservoir microbial risk assessment fecal contamination waterborne pathogen fecal indicator