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Wideband imaging of extended targets with the decomposition of the time reversal operator

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Chinese Journal of Acoustics 2020年第2期39卷 192-206页

作者： LI Chunxiao GUO mingfei WANG Zhongkang College of Mechanical Engineering Zhejiang University of Technology Hangzhou 310023 Key Laboratory of Special Purpose Equipment and Advanced Processing Technology Ministry of Education and Zhejiang ProvinceZhejiang University of Technology Hangzhou 310023 National Key Laboratory of Science and Technology on Sonar Hangzhou Applied Acoustics Research Institute Hangzhou 310023

The weighted wideband imaging approach of full signal subspaces is proposed based on the decomposition of the time reversal operator(DORT). Although each singular vector of nonzero singular values does not correspond to one of the extended targets any more, the conventional approach of selective time reversal focusing still chooses one of the signal subspaces for imaging. Simultaneously, the time-reversal MUSIC imaging is carried out at a single frequency for wideband signal. The imaging of both methods has a high background *** order to overcome these drawbacks, the number of signal subspaces is determined by the singular values of the time reversal operator, and then DORT imaging of full signal subspaces and entire bandwidth is achieved using the generalized reflectivity coefficients as the weighted parameters. The experimental result shows that the sidelobe level of this approach is extremely decreased.

关键词： wideband singular operator

Fabrication and evaluation of a portable and reproducible quartz crystal microbalance immunochip for label-free detection ofβ-lactoglobulin allergen in milk products

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Food Science and Human Wellness 2022年第5期11卷 1315-1321页

作者： mingfei Pan Liping Hong Jingying Yang Xiaoqian Xie Kaixin Liu Shuo Wang Key Laboratory of Food Nutrition and Safety Ministry of Education of ChinaTianjin University of Science and TechnologyTianjin 300457China State Key Laboratory of Food Nutrition and Safety Tianjin University of Science&TechnologyTianjin 300457China

In this study,a label-free,portable and reproducible immunochip based on quartz crystal microbalance(QCM)was developed for the qualitative detection ofβ-lactoglobulin(β-LG),an allergen,in milk *** parameters in the fabrication and regeneration procedure such as pH of the coupling microenvironment,amount of anti-β-LG antibody and regeneration reagent were optimized in *** optimal conditions,the proposed QCM immunochip exhibited good recognition of β-LG,with a calibration curve of ΔF=12.877 C_(β-LG)^(0.4809)(R^(2)=0.9982)and limit of detection of 0.04μg/***,this portable QCM immunochip had good stability,high specificity,and no obvious cross-reaction to three other milk proteins(α-casein,α-lactalbumin,and lactoferrin).It could compete a qualitative measurement within5 min,and could be reused at least ten *** the β-LG analysis of actual milk samples,the developed QCM immunochip yielded reliable and accurate results,which correlated strongly with those from the standard HPLC method(R^(2)=0.9969).Thus,the portable,stable,and reproducible QCM immunochip developed in this study allowed the rapid,cost-effectively and sensitively measure theβ-LG in milk products.

关键词： β-Lactoglobulin allergen Quartz crystal microbalance Immunochip Milk products

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Time reversal imaging of suspended target in strong reverberation

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Chinese Journal of Acoustics 2020年第3期39卷 315-328页

作者： LI Chunxiao GUO mingfei WANG Zhongkang MOE/Zhejiang Provincial Key Laboratory of Special Purpose Equipment and Advance Manufacturing Technology College of Mechanical EngineeringZhejiang University of TechnologyHangzhou 310014 National Key Laboratory of Science and Technology on Sonar Hangzhou Applied Acoustics Research InstituteHangzhou 310023

The weighted wideband time-reversal imaging approach of full signal subspaces was *** extended target is modeled as an infinite number of independent point-like scatterers,and the imaging is constructed by accumulating all time-reversal images over all signal subspaces and the entire bandwidth in the region of suspected *** the bottom of a laboratory water waveguide,a cylindrical shell was used to produce *** experiments were carried *** first experiment is that an extended target was suspended near the cylindrical shell,whose echo and the reverberation reflected by the cylindrical shell were in different time *** second experiment is that a point-like target was suspended above the cylindrical shell,thus the echo and the reverberation were in the same time *** experimental results show that the imaging quality of the proposed method is better than that of the conventional time reversal imaging methods for weak suspended targets in a strong reverberation background.

关键词： cylindrical reverberation infinite

Three-dimensional S-wave velocity structure of the crust and upper mantle for the normal fault system beneath the Yinchuan Basin from joint inversion of receiver function and surface wave

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Science China Earth Sciences 2023年第5期66卷 997-1014页

作者： Weilai WANG Guangyao CAI Guijuan LAI Xianwei ZENG Jingjing BAO Long ZHANG Jun SU mingfei CHEN Institute of Geophysics China Earthquake AdministrationBeijing100081China Earthquake Agency of Ningxia Hui Autonomous Region Yinchuan750001China Sichuan Earthquake Agency Chengdu610041China

A series of parallel normal faults are distributed in the Helan Mountain-Yinchuan Basin tectonic belt,where a historical M8.0 earthquake *** is rare that such a great earthquake occurs in a normal fault system within the *** deeply understand the fine structure of the normal fault system,we deployed 104 broadband temporary stations near the system,collected data from permanent stations and other temporary stations nearby,and obtained the high-precision threedimensional S-wave velocity structure beneath 206 stations via joint inversion of receiver function and surface wave.A typical graben-in-graben feature bounded by four major faults was identified in the Yinchuan *** analyzed the seismicity in the normal fault system and found a seismic strip in the southern part of the basin,where there are significant changes in the sedimentary thickness,which is speculated to be the southern boundary of the normal fault *** are significant differences in the crustal thickness and velocity structure in the crust on both sides of the boundary between the Helan Mountain and the Yinchuan Basin,and a low-velocity zone was identified in the upper mantle beneath this boundary,which could be related to the fact that the Helan Mountain-Yinchuan Basin tectonic belt is located between the Alxa Block and the Ordos *** M8.0 Yinchuan-Pingluo earthquake occurred at the junction of four major faults in the Yinchuan Basin,which was located in the high-velocity zone near the velocity transition zone at the basin-mountain *** low-velocity zone in the upper mantle beneath this boundary may have promoted the nucleation of this *** on evidence from geological drilling,micro seismicity,the regional stress field,and the velocity models obtained in this study,it is inferred that the eastern piedmont fault zone of the Helan Mountain was the seismogenic fault of the 1739 M8.0 Yinchuan-Pingluo earthquake.

关键词： Yinchuan Basin Helan Mountain Receiver function Surface wave tomography Normal fault system

Aerosol-assisted submicronγ-Fe2O3/C spheres as a promising heterogeneous Fenton-like catalyst for soil and groundwater remediation:Transport,adsorption and catalytic ability

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Chinese Chemical Letters 2020年第3期31卷 715-720页

作者： Jingjing Zhan mingfei Li Xiujuan Zhang Yu An Weiqi Sun Aixia Peng Hao Zhou School of Food and Environment Dalian University of TechnologyPanjin 124221China School of Petroleum and Chemical Engineering Dalian University of TechnologyPanjin 124221China

This research reports a novel heterogeneous Fenton-like catalyst which could freely move through the model sediments and easily seize the pollutants in addition to efficiently catalyze H2O2,well suitable for soil and groundwater ***,submicron y-Fe2O3/C spheres were synthesized through a facile one-step aerosol-based *** a series of column tests,these spheres exhibit better transport ability due to their optimal size,conforming to the prediction by the Tufenkji-Elimelech filtration theo ***,y-Fe2O3/C spheres could act as a strong adsorbent for organic pollutants owing to the presence of carbon,thereby providing a driving force to gather contaminants into their vicinity and facilitating the *** addition,immobilization of y-Fe2O3 nanoparticles into carbon spheres protects iron oxides from aggregation,and thus retains the number of active sites for catalytic decomposition of ***,the system containing the as-prepared y-Fe2O3/C spheres and H2O2 shows the high removal efficiency and degradation efficiency in the remediation of recalcitrant organic contaminants such as methylene blue and sulfamethoxazole.

关键词： Heterogeneous Fenton Groundwater remediation Aerosol-assisted materials Transport Adsorption

TiO_(2)/CuPc/NiFe-LDH photoanode for efficient photoelectrochemical water splitting

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Chinese Chemical Letters 2021年第3期32卷 1165-1168页

作者： Yanfei Li Ruikang Zhang Jianming Li Jingchao Liu Yucong Miao Jian Guo mingfei Shao State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing 100029China College of Chemistry and Material Science Hebei Normal UniversityShijiazhuang 050024China Petroleum Geology Research and Laboratory Center Research Institute of Petroleum Exploration&Development(RIPED)PetroChinaBeijing 100083China

Photoelectrochemical(PEC)water splitting is a promising approach for renewable hydrogen ***,the practical PEC solar-to-fuel conversion efficiency is still low owing to poor light absorption and rapid recombination of charge carriers in *** this work,we report a ternary photoanode with simultaneously enhancement of light absorption and water oxidation efficiency by introducing copper phthalocyanine(CuPc)and nickel iron-laye red double hydroxide(NiFe-LDH)on TiO_(2)(denoted as TiO_(2)/CuPc/NiFe-LDH).An experimental study reveals that CuPc loading on TiO_(2)bring strong visible light absorption;NiFe-LDH as an oxygen evolution reaction catalyst efficiently accelerates the surface water oxidation *** synergistic effect of CuPc and NiFe-LDH gives enhanced photocurrent density(2.10 mA/cm^(2)at 0.6 V ***)and excellent stability in the ternary TiO_(2)/CuPc/NiFeLDH photoanode.

关键词： Photoelectrochemical Water splitting TiO_(2)photoanode Layered double hydroxide Photosensitizer

CHANGES IN NEUROPEPTIDES AFTER MUSIC EXPOSURE 429Cardioprotective effect of ivabradine via the AMPK/SIRT1/PGC-1αsignaling pathway in myocardial ischemia/reperfusion injuryinduced in H9c2 cell

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BIOCELL 2020年第3期44卷 431-441页

作者： XINGXING ZHU TIANFENG HUA mingfei WU JIATIAN WU JIANCHAO HONG MIN YANG The Second Affiliated Hospital of Anhui Medical University HefeiChina The Laboratory of Cardiopulmonary Resuscitation and Critical Care Medicine The Second Affiliated Hospital of Anhui Medical UniversityHefeiChina School of Pharmacy Anhui Province Key Laboratory of Major Autoimmune DiseasesAnhui Medical UniversityHefeiChina

Post-resuscitation myocardial dysfunction(PRMD)is the most severe myocardial ischemia-reperfusion injury(MIRI)and is characterized by difficult treatment and poor *** has shown the protective effects of the rational use of ivabradine(IVA)against PRMD,however,the molecular mechanisms of IVA remain *** this study,an ischemia-reperfusion injury(IRI)model was established using hypoxic *** results demonstrated that pretreatment with IVA reduced IRI-induced cytotoxicity and *** attenuated mitochondrial damage,eliminated excess reactive oxygen species(ROS),suppressed IRI-induced ATP and NAD+,and increased the AMP/ATP *** further found that IVA increased the mRNA levels of sirtuin 1(SIRT1)and peroxisome proliferator-activated receptor-γcoactivator 1α(PGC-1α)and upregulated the expression levels of phosphorylated AMP-activated protein kinase(p-AMPK)/AMPK,SIRT1,and PGC-1α***,no change in AMPK mRNA levels was *** energy metabolism significantly changed after *** aim of this study was to demonstrate the cardioprotective effect of Ivabradine via the AMPK/SIRT1/PGC-1αsignaling pathway in myocardial ischemia/reperfusion injury-induced in H9c2 cell.

关键词： Ivabradine Myocardial ischemia reperfusion injury Energy metabolism Oxidative stress AMPK/SIRT1/PGC-1α pathway

Spatial-channel transformer network based on mask-RCNN for efficient mushroom instance segmentation

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International Journal of Agricultural and Biological Engineering 2024年第4期17卷 227-235页

作者： Jiaoling Wang Weidong Song Wengang Zheng Qingchun Feng mingfei Wang Chunjiang Zhao Northwest Agriculture and Forestry University Xi’an 712199China Nanjing Institute of Agricultural Mechanization Ministry of Agriculture and Rural AffairsNanjing 210014China Intelligent equipment Technology Research Center Beijing Academy of Agriculture and Forestry SciencesBeijing 100097China Zhejiang Provincial Key Laboratory of Agricultural Intelligent Equipment and Roboics/College of Biosystems Engineering and Food Science Zhejiang UniversityHangzhou 310058China

Edible mushrooms are rich in nutrients;however,harvesting mainly relies on manual *** localization of each mushroom is necessary to enable a robotic arm to accurately pick edible *** studies used detection algorithms that did not consider mushroom pixel-level *** these algorithms are combined with a depth map,the information is ***,in instance segmentation algorithms,convolutional neural network(CNN)-based methods are lightweight,and the extracted features are not *** guarantee real-time location detection and improve the accuracy of mushroom segmentation,this study proposed a new spatial-channel transformer network model based on Mask-CNN(SCT-Mask-RCNN).The fusion of Mask-RCNN with the self-attention mechanism extracts the global correlation outcomes of image features from the channel and spatial ***,Mask-RCNN was used to maintain a lightweight structure and extract local features using a spatial pooling pyramidal structure to achieve multiscale local feature fusion and improve detection *** results showed that the SCT-Mask-RCNN method achieved a segmentation accuracy of 0.750 on segm_Precision_mAP and detection accuracy of 0.638 on Bbox_Precision_*** to existing methods,the proposed method improved the accuracy of the evaluation metrics Bbox_Precision_mAP and segm_Precision_mAP by over 2%and 5%,respectively.

关键词： edible mushrooms picking instance segmentation deep learning algorithm

Mechanisms and biotechnological applications of transcription factors

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Synthetic and Systems Biotechnology 2023年第4期8卷 565-577页

作者： Hehe He mingfei Yang Siyu Li Gaoyang Zhang Zhongyang Ding Liang Zhang Guiyang Shi Youran Li Key Laboratory of Industrial Biotechnology Ministry of EducationSchool of BiotechnologyJiangnan UniversityWuxiJiangsu Province 214122PR China National Engineering Research Center of Cereal Fermentation and Food Biomanufacturing Jiangnan University1800 Lihu AvenueWuxiJiangsu Province 214122PR China Jiangsu Provisional Research Center for Bioactive Product Processing Technology Jiangnan University1800 Lihu AvenueWuxiJiangsu Province 214122PR China

Transcription factors play an indispensable role in maintaining cellular viability and finely regulating complex internal metabolic *** crucial bioactive functions rely on their ability to respond to effectors and concurrently interact with binding *** advancements have brought innovative insights into the understanding of transcription *** this review,we comprehensively summarize the mechanisms by which transcription factors carry out their functions,along with calculation and experimental-based methods employed in their ***,we highlight recent achievements in the application of transcription factors in various biotechnological fields,including cell engineering,human health,and ***,the current limitations of research and provide prospects for future investigations are *** review will provide enlightening theoretical guidance for transcription factors engineering.

关键词： Transcription factors Binding sites Database-based prediction Experimental identification Cell engineering Biomanufacturing