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Ultra-high sensitivity fiber optic microphone with corrugated graphene-oxide diaphragm for voice recognition

Nano Research 2024年第8期17卷 7593-7602页

作者： Yang Liu Cheng Li Lingxiao Yu zhengwei wu Shangchun Fan Ruitao Lv School of Instrumentation and Optoelectronic Engineering Beihang UniversityBeijing 100191China Shenzhen Institute of Beihang University Shenzhen 518063China Key Laboratory of Advanced Materials(MOE) School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Aerospace Information Research Institute Chinese Academy of SciencesBeijing 100190China

To avoid interference from unexpected background noises and obtain high fidelity voice signal,acoustic sensors with high sensitivity,flat frequency response,and high signal-to-noise ratio(SNR)are urgently needed for voice ***(GO)has received extensive attention due to its advantages of controllable thickness and high fracture ***,low mechanical sensitivity(SM)introduced by undesirable initial stress limits the performance of GO material in the field of voice *** alleviate the aforementioned issue,GO diaphragm with annular corrugations is *** means of the reusable copper mold machined by picosecond laser,the fabrication and transfer of corrugated GO diaphragm are realized,thus achieving a Fabry–Perot(F–P)acoustic *** from the structural advantage of the corrugated GO diaphragm,our F–P acoustic sensor exhibits high S_(M)(43.70 nm/Pa@17 kHz),flat frequency response(−3.2 to 3.7 dB within 300–3500 Hz),and high SNR(76.66 dB@1 kHz).In addition,further acoustic measurements also demonstrate other merits,including an excellent frequency detection resolution(0.01 Hz)and high time stability(output relative variation less than 6.7% for 90 min).Given the merits presented before,the fabricated F–P acoustic sensor with corrugated GO diaphragm can serve as a high-fidelity platform for acoustic detection and voice *** conjunction with the deep residual learning framework,high recognition accuracy of 98.4%is achieved by training and testing the data recorded by the fabricated F–P acoustic sensor.

关键词： corrugated graphene-oxide(GO)diaphragm Fabry-Perot(F-P)acoustic sensor mechanical sensitivity voice recognition

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Design of Si3N4 ridge-slot micro-ring resonator and generation of dual-comb based on orthogonally bicolor pumping

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Optoelectronics Letters 2024年第11期20卷 647-653页

作者： WEN Jin WANG Qian YU Huimin wu zhengwei ZHANG Hui School of Science Xi'an Shiyou University Shaanxi Engineering Research Center of Oil and Gas Resource Optical Fiber Detection Shaanxi Key Laboratory of Measurement and Control Technology for Oil and Gas wells

A novel high quality-factor（Q） micro-ring resonator（MRR） structure based on the Si3N4ridge-slot waveguide is proposed, and the MRR is pumped by orthogonally polarized bicolor pumping to generate dual-comb.

关键词： A

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Ultra-compact wavelength multiplexer/demultiplexer based on subwavelength grating-assisted multimode interference coupler by inverse design

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Optoelectronics Letters 2024年

作者： WEN Jin PAN Yu wu zhengwei ZHANG Ying School of Science， Xi'an Shiyou University Shaanxi Engineering Research Center of Oil and Gas Resource Optical Fiber Detection Shaanxi Key Laboratory of Measurement and Control Technology for Oil and Gas Wells

Inverse design of on-chip wavelength multiplexer/demultiplexer has attracted significant attention to improve equipment performance and miniaturization. We proposed and demonstrated the ultra-compact 1310/1550 nm wavelength multiplexer/demultiplexer assisted by subwavelength grating （SWG） using particle swarm optimization （PSO） algorithm in silicon-on-insulator （SOI） platform. Through the self-imaging effect of multimode interference （MMI） coupler， the demultiplexing function for 1310 nm and 1550 nm wavelengths is implemented. After that， three parallel SWG-based slots are inserted into the MMI section so that the effective refractive index of the modes can be engineered and thus the beat length can be adjusted. Importantly， these three SWG slots significantly reduce the length of the device， which is much shorter than the length of traditional MMI-based wavelength demultiplexers. Ultimately， by using the PSO algorithm， the equivalent refractive index and width of the SWG in a certain range are optimized to achieve the best performance of the wavelength demultiplexer. It has been verified that the device footprint is only 2×30.68 μm2， and 1dB bandwidths of larger than 120 nm are acquired at 1310 nm and 1550 nm wavelengths. Meanwhile， the transmitted spectrum shows that the insertion loss （IL） values are below 0.47 dB at both wavelengths when the extinction ratios （ER） values are above 12.65 dB. This inverse design approach has been proved to be efficient in increasing bandwidth and reducing device length.

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Design of SiNridge-slot micro-ring resonator and generation of dual-comb based on orthogonally bicolor pumping

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Optoelectronics Letters 2024年

作者： Wen Jin Wang Qian Yu Huimin wu zhengwei Zhang Hui School of Science， Xi'an Shiyou University Shaanxi Engineering Research Center of Oil and Gas Resource Optical Fiber Detection Shaanxi Key Laboratory of Measurement and Control Technology for Oil and Gas wells

A novel high quality-factor （Q） micro-ring resonator （MRR） structure based on the Si3N4ridge-slot waveguide is proposed， and the MRR is pumped by orthogonally polarized bicolor pumping to generate dual-comb. We optimized the structure of MRR by the finite element method and precise dispersion engineering， which finally obtained the suitable MRR geometry with negative dispersion characteristics at 1550 nm， having Q of 1.7×107and the absorption loss as low as 2.6×10-5dB/cm. The simulation model of generating dual-comb is established as coupled Lugiato-Lefever equation （LLE）， which takes into account the higher order dispersion， cross-phase modulation （XPM）， multiphoton absorption， and external pumping. Solved by the split-step Fourier method （SSFM） and the fourth-order Runge-Kutta （RK4） method， the numerical results show that the generated dual-comb is periodically equally spaced distribution but with slightly different intensities in the time domain. In the frequency domain， there are 64 comb teeth with intensities higher than -100 dBm with a bandwidth of 120 nm. Particularly， in the case of bicolor orthogonal polarization pumping， a smaller amount of detuning does not greatly affect the bandwidth of the dual-comb.

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Preliminary compact torus injection experiments on the Keda Torus eXperiment reversed field pinch

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Plasma Science and Technology 2024年第10期26卷 56-64页

作者： Tao LAN Chen CHEN Chijin XIAO Weixing DING Jie wu Wenzhe MAO Sen ZHANG Defeng KONG Shoubiao ZHANG zhengwei wu Qilong DONG Yongkang ZHOU Hangqi XU Jiaren wu Zian WEI Xiaohui WEN Hai WANG Chu ZHOU Adi LIU Hong LI Jinlin XIE Wandong LIU Ge ZHUANG Department of Plasma Physics and Fusion Engineering University of Science and Technology of ChinaHefei 230026People’s Republic of China Plasma Physics Laboratory University of SaskatchewanSaskatoon SK S7N 5E2Canada Institute of Plasma Physics Chinese Academy of SciencesHefei 230031People’s Republic of China

A new compact torus injector(KTX-CTI)has been built for injection experiments on the Keda Torus eXperiment(KTX)reversed field pinch(RFP).The aim is to study the fundamental physics governing the compact torus(CT)central fueling *** experiments conducted under the sole influence of a 0.1 T toroidal magnetic field,the injected CT successfully penetrated the entire toroidal magnetic field,reaching the inner wall of the KTX vacuum *** reaching the inner wall,the CT diffused both radially outward and toroidally within the vessel at a discernible diffusion ***,the inherent helicity within the CT induced a modest KTX plasma current of 200 A,consistent with predictions based on helicity *** injection demonstrated the capability to initiate KTX discharges at low loop voltages,suggesting its potential as a pre-ionization and current startup *** RFP discharges featuring CT injection,the central plasma density was found to exceed the Greenwald density limit,with more peaked density profiles,indicating the predominant confinement of CT plasma within the core region of the KTX bulk plasma.

关键词： compact torus fueling reversed field pinch density limit

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Difference analysis in terahertz wave propagation in thermochemical nonequilibrium plasma sheath under different hypersonic vehicle shapes

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Chinese Journal of Aeronautics 2023年第10期36卷 137-151页

作者： Wenchong OUYANG Qi LIU zhengwei wu School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230026China Joint Laboratory of Plasma Application Technology Institute of Advanced TechnologyUniversity of Science and Technology of ChinaHefei 230031China CAS Key Laboratory of Geospace Environment University of Science and Technology of ChinaHefei 230026China

Research on terahertz communication under different vehicles has important guiding significance for the design of future hypersonic vehicle and Radio Frequency(RF)*** this paper,a joint simulation model of plasma flow under thermochemical nonequilibrium state and terahertz transmission is developed to investigate the differences in terahertz wave transmission characteristics under different vehicle shapes and the related *** comparing the plasma sheath characteristics and terahertz transmission among HIFIRE-5b(Hypersonic International Flight Research Experimentation-5b),RAM C(Radio Attenuation Measurement C)and ARD(Atmospheric Reentry Demonstrator)vehicles,it is found that the sheath thickness and electron density of ARD vehicles is significantly larger than that of HIFIRE-5b and RAM C vehicles,resulting in greater terahertz wave *** absorption plays a major role in the terahertz attenuation of vehicles,and the contribution of reflection effects is only observed in the ARD vehicle due to its larger plasma sheath thickness and spatial structure *** on the above comparison results,a shape design scheme of reducing the vehicle head and tail for mitigating RF blackout is proposed,and the scheme is proved by further analyzing the effects of different vehicle heads and tails on the terahertz *** the decrease of the head radius and tail width of hypersonic vehicle,the wave attenuation at the same terahertz frequency decreases,and the contribution of reflection effect to wave attenuation gradually ***,the shape design scheme of reducing the vehicle head and tail can effectively alleviate the RF blackout problem,which provides an important reference value for future hypersonic vehicle design.

关键词： Hypersonic vehicles Plasma flow Plasma sheaths Shape optimization Terahertz waves Wave propagation

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菱角新害虫林间环足摇蚊的形态及生物学特性初步研究

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中国植保导刊 2024年第9期44卷 14-19+32页

作者：师沛琼徐进吴正伟郭良珍广东海洋大学滨海农业学院

为明确广东湛江菱角上一种新害虫的种类及其形态、生物学特性，开展了野外调查、采集，室内饲养、观察，结合DNA条形码技术进行了种类鉴定。研究发现：该虫以幼虫聚集在菱角植株的茎部、叶柄、叶背面啃食为害，一生经历卵、幼虫、蛹、... 详细信息

为明确广东湛江菱角上一种新害虫的种类及其形态、生物学特性，开展了野外调查、采集，室内饲养、观察，结合DNA条形码技术进行了种类鉴定。研究发现：该虫以幼虫聚集在菱角植株的茎部、叶柄、叶背面啃食为害，一生经历卵、幼虫、蛹、成虫四个时期。卵长椭圆形，数百粒卵包裹于卵囊中呈带状或螺旋状，卵期4.333 3 d；幼虫蠕虫状，体色近透明，消化道清晰可见，幼虫期9.580 6 d；蛹为裸蛹，蛹期3.190 3 d；雌、雄成虫的体长分别为0.256 4、0.348 0 cm，寿命分别为2.193 5、1.580 6 d。雌、雄成虫均呈黄色，翅面无斑纹，足的节间呈深色，身体躯干具深色斑纹，胸部背面具3条深色纵纹。该虫具有幼体生殖及孤雌生殖习性，单头幼体产卵319.2粒，显著高于单雌产卵量。经COⅠ序列比对及系统发育分析，明确该虫为林间环足摇蚊Cricotopus sylvestris (Fabricius)。

关键词：摇蚊形态生物学特性分子鉴定水生昆虫水生蔬菜

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Facilely Fabricating Superhydrophobic Resin-based Coatings with Lower Water Freezing Temperature and Ice Adhesion for Anti-icing Application

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Journal of Bionic Engineering 2019年第5期16卷 794-805页

作者： Weilan Liu Haifeng Chen Yizhou Shen zhengwei wu Institute of Advanced Materials(IAM)9 Jiangsu National Synergistic Innovation Center Jor Advanced Materials(SICAM) Nanjing Tech University(Nanjinglech)Nanjing 211816China Department of Materials Chemistry Qiuzhen SchoolHuzhou UniversityHuzhou 313000China College ofMaterials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 2W016China

This work is focused on the development of a facile strategy to fabricate superhydrophobic coatings,which are characterized with lower water freezing temperature and lower ice ***,a kind o f polyacrylic acid(PAA)based resin material is synthesized as the *** the functionally-modified S i02 nanoparticles are added to regulate the surface morphology for obtaining the ideal *** as-synthesized resin coatings possess strong bonding strength with metal substrate,and the surface hierarchical morphologies(10 wt% SiO2 nanoparticles)induce the robust superhydrophobicity with a high water contact angle of 152°.Also,the superhydrophobic coatings are endowed with high icephobicity,and the freezing temperature of reference water droplet is reduced to-20.33℃ comparing with that(-13.83℃)on the coatings without additive ***,the ice adhesion strength on the superhydrophobic coatings is only 250 kPa,exhibiting the great ability of ice repellence.

关键词： bioinspired surface coatings superhydrophobicity icing temperature ice adhesion

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Facilely fabricating superhydrophobic coated-mesh materials for effective oil-water separation:Effect of mesh size towards various organic liquids

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Journal of Materials Science & Technology 2020年第16期47卷 151-160页

作者： Haifeng Chen Yizhou Shen Zhaoru He zhengwei wu Xinyu Xie Department of Materials Chemistry Qiuzhen SchoolHuzhou UniversityHuzhou 313000China College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 210016China

Effective oil-water separation is a continuous pursuit,not only for scientific research but also for engineering application,because oil spills are causing the great pollution in the current ocean *** we reported a superhydrophobic coated-mesh,where the coatings were composed of fluorinated silica(F-SiO2)and polydimethylsiloxane(PDMS),demonstrating the excellent oil-water separation ability towards various organic *** introduction of F-SiO2 could well induce a certain extent of microscopic roughness,leading to the remarkable water *** resultant coatings exhibited the robust superhydrophobicity with the water contact angle reaching 155.9°±1.0°.On this basis,the pore size of polyethylene terephthalate(PET)mesh materials(as a substrate)was mainly discussed with the great oil-water separation efficiency of as high as 98%towards various organic ***,under the assistance of physical model,it was confirmed that there was a mechanical relation between pore size and organic liquids,where the main connotation was the matching issue of surface tension of organic liquids with the geometrical mechanic(induced by the pore size of the superhydrophobic coated-mesh).This work on the size effect of superhydrophobic coated-mesh materials on various organic liquids is beneficial to the design and manu facture of ideal oil-water separation materials.

关键词： Superhydrophobic Coatings Oil-water separation Surface tension

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Cold air plasma:A potential strategy for inducing apoptosis of rheumatoid arthritis fibroblast‐like synoviocytes

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High Voltage 2022年第1期7卷 106-116页

作者： Chengbiao Ding Chao Chen Wenchong Ouyang Qi Liu Lin Lin zhengwei wu School of Nuclear Science and Technology University of Science and Technology of ChinaHefeiChina Department of Rehabilitation Medicine The Second Hospital of Anhui Medical UniversityHefeiAnhuiChina Department of Medical Oncology Division of Life Sciences and MedicineThe First Affiliated Hospital of USTCUniversity of Science and Technology of ChinaHefeiAnhuiChina CAS Key Laboratory of Geospace Environment University of Science and Technology of ChinaHefeiChina

Rheumatoid arthritis(RA)is an autoimmune disease of the joints characterised by synovial hyperplasia and chronic *** arthritis fibroblast‐like synoviocytes(RA‐FLS)cells are the dominant cell type in the hyperplastic synovial membrane,which play a key role in the pathogenesis of *** can invade cartilage,cause inflammation,destroy joints,and show tumour‐like anti‐apoptosis ***,the purpose of this study is to investigate the effect of cold air plasma(CAP)on RA‐FLS *** results showed that CAP treatment for 120 s could significantly reduce the viability of RA‐FLS cells,increase the content of intracellular reactive ox-ygen species(ROS),and significantly down‐regulate the ratio of apoptosis‐related protein Bcl‐2 to *** this study,a novel approach of inducing apoptosis in RA‐FLS cells using CAP was proposed,which may provide a new choice for joint tar-geting therapy of RA.

关键词： cytes inflammation apoptosis

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