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Short-term inhalation exposure evaluations of airborne antibiotic resistance genes in environments

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Journal of Environmental Sciences 2022年第12期34卷 62-71页

作者： Zhenchao Zhou Xinyi Shuai Zejun Lin Lingxuan Meng Xiaoliang Ba Mark AHolmes Hong Chen Institute of Environmental Technology College of Environmental and Resource SciencesZhejiang UniversityHangzhou 310058China Department of Veterinary Medicine University of CambridgeCambridge CB39DAUK

Antibiotic resistance is a sword of Damocles that hangs over *** regards to airborne antibiotic resistance genes(AARGs),critical knowledge gaps still exist in the identification of hotspots and quantification of exposure levels in different ***,we have studied the profiles of AARGs,mobile genetic elements(MGEs)and bacterial communities in various atmospheric environments by high throughput q PCR and 16S r RNA gene *** propose a new AARGs exposure dose calculation that uses short-term inhalation(STI).Swine farms and hospitals were high-risk areas where AARGs standardised abundance was more abundant than suburbs and urban ***,resistance gene abundance in swine farm worker sputum was higher than that in healthy individuals in other *** correlation between AARGs with MGEs and bacteria was strong in suburbs but weak in livestock farms and *** exposure analysis revealed that occupational intake of AARGs(via PM10)in swine farms and hospitals were 110 and 29 times higher than in suburbs,were 1.5×10^(4),5.6×10^(4)and 5.1×10^(2)copies,i.e.,61.9%,75.1%and 10.7%of the overall daily inhalation intake,*** study comprehensively compares environmental differences in AARGs to identify high-risk areas,and forwardly proposes the STI exposure dose of AARGs to guide risk assessment.

关键词： airborne Antibiotic resistance genes(ARGs) Short-term inhalation Risk assessment

Terrain classification based on adaptive weights with airborne LiDAR data for mining area

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中国有色金属学会会刊：英文版 2011年第S3期21卷 648-653页

作者： LI Hui-ying1, WANG Zhi2, SUN Ya-feng1, LI Wen-hui1 1. College of Computer Science and Technology, Jilin University, Changchun 130012, China 2. College of Resources and Civil Engineering, Northeastern University, Shenyang 110004, China [a] College of Computer Science and Technology Jilin University Changchun 130012 China [b] College of Resources and Civil Engineering Northeastern University Shenyang 110004 China

The fast high-efficiency inspection for mining subsidence of mine area is a reliable way for forecasting accident and evaluating losing expense. In order to monitor mining subsidence of exploitation mine efficiently, LiDAR data were used and a novel strip division method was brought forward based on separating-treatment theory, which divided the mass of discrete three-dimensional point cloud data into a series of parallel strips and reduced the dimension in each strip. Polynomial fitting algorithm based on the adaptive weights, which located in the range of the strip, was used for classification complex terrain data of mine-area. The results show that LiDAR datamation can be greatly reduced. In the mean time, the time spending for calculation is shortened, and computational complexity is simplified. Therefore, high-efficiency terrain classification of LiDAR point cloud method can be great beneficial to monitoring environment of mine area.

关键词： mining subsidence airborne LiDAR strip division adaptive weights

Dynamics response analysis of airborne external storage system with clearance between missile-frame

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Chinese Journal of Aeronautics 2020年第12期33卷 3278-3287页

作者： Yongfeng YANG Qingyang ZHENG Jianjun WANG Zhongfu MA Xiangqiu LIU Department of Engineering Mechanics Northwestern Polytechnical UniversityXi'an 710072China Key Laboratory of Vibration and Control of Aero-Propulsion System Ministry of Education Northeastern UniversityShenyang 110819China China airborne Missile Academy Luoyang 471099China

Considering the aircraft and its external components are subjected to complex and variable aerodynamic loads during the working process,the missile-frame clearance system of the airborne external missile is *** random vibration characteristics of the airborne external components are analyzed by finite element *** finite element model is optimized with reference to the test results,and the effects of different clearance on the dynamic response of the missile-frame system are *** result shows that the frequency response curves of the same position and the resonant peak frequencies are consistent under different *** acceleration response at both ends of the missile is large and the amplitude near the center of mass is *** results can be used to predict reasonable missile-frame clearance and make guidance to the structural design and reliability analysis of the missile-frame system.

关键词： airborne Dynamic response Finite element method(FEM) Missile-frame Random vibration

Structure and receptor-binding properties of an airborne transmissible avian infl uenza A virus hemagglutinin H5(VN1203mut)

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Protein & Cell 2013年第7期4卷 502-511页

作者： Xishan Lu Yi Shi Wei Zhang Yanfang Zhang Jianxun Qi George F Gao College of Veterinary Medicine China Agricultural UniversityBeijing 100193China Research Network of Immunity and Health(RNIH) Beijing Institutes of Life ScienceChinese Academy of SciencesBeijing 100101China CAS Key Laboratory of Pathogenic Microbiology and Immunology Institute of MicrobiologyChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100049China Laboratory of Protein Engineering and Vaccines Tianjin Institute of Industrial BiotechnologyChinese Academy of SciencesTianjin 300308China National Institute for Viral Disease Control and Prevention Chinese Center for Disease Control and Prevention(China CDC)Beijing 102206China

Avian infl uenza A virus continues to pose a global threat with occasional H5N1 human infections,which is em-phasized by a recent severe human infection caused by avian-origin H7N9 in *** these viruses do not transmit effi ciently in human *** a few ami-no acid substitutions of the hemagglutinin H5 protein in the laboratory,two H5 mutants have been shown to obtain an air-borne transmission in a mammalian ferret *** in this study one of the mutant H5 proteins devel-oped by Kawaoka’s group(VN1203mut)was expressed in a baculovirus system and its receptor-binding properties were *** herein show that the VN1203mut had a dramatically reduced binding affi nity for the avianα2,3-linkage receptor compared to wild type but showed no detectable increase in affi nity for the humanα2,6-linkage receptor,using Surface Plasmon Resonance ***,the crystal structures of the VN1203mut and its complexes with either human or avian receptors demon-strate that the VN1203mut binds the human receptor in the same binding manner(cis conformation)as seen for the HAs of previously reported 1957 and 1968 pandemic influenza *** receptor binding and crystallo-graphic data shown here further confi rm that the ability to bind the avian receptor has to decrease for a higher hu-man receptor binding affi *** the Q226L substitution is shown important for obtaining human receptor binding,we suspect that the newly emerged H7N9 binds human receptor as H7 has a Q226L substitution.

关键词： airborne transmission H5 avian infl uenza structure receptor binding

A framework of rank-reduced space-time adaptive processing for airborne radar and its applications

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Science China(Technological Sciences) 1997年第5期40卷 505-512页

作者：廖桂生保铮许志勇 Key Laboratory for Radar Signal Processing Xidian University Xi'an 710071 China

A new equivalent formulation of the joint domain space-time optimum processor for airborne phased array radar application is derived. Then a new framework of space-time adaptive processing (STAP) for airborne radar systems which includes most of suboptimum algorithms in the literature is proposed. The performance of two typical rank-reduced time-space joint-domain processors based on Doppler pre-filtering is analyzed in detail based on the proposed framework.

关键词： airborne radar space-time adaptive processing (STAP) adaptive array clutter suppression.

Parameter Identification of JONSWAP Spectrum Acquired by airborne LIDAR

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Journal of Ocean University of China 2017年第6期16卷 998-1002页

作者： YU Yang PEI Hailong XU Chengzhong Key Laboratory of Autonomous Systems and Networked Control Ministry of EducationSouth China University of Technology LAGEP Batiment CPEUniversité Claude Bernard Lyon 1

In this study, we developed the first linear Joint North Sea Wave Project(JONSWAP) spectrum(JS), which involves a transformation from the JS solution to the natural logarithmic scale. This transformation is convenient for defining the least squares function in terms of the scale and shape parameters. We identified these two wind-dependent parameters to better understand the wind effect on surface waves. Due to its efficiency and high-resolution, we employed the airborne Light Detection and Ranging(LIDAR) system for our measurements. Due to the lack of actual data, we simulated ocean waves in the MATLAB environment, which can be easily translated into industrial programming language. We utilized the Longuet-Higgin(LH) random-phase method to generate the time series of wave records and used the fast Fourier transform(FFT) technique to compute the power spectra density. After validating these procedures, we identified the JS parameters by minimizing the mean-square error of the target spectrum to that of the estimated spectrum obtained by FFT. We determined that the estimation error is relative to the amount of available wave record data. Finally, we found the inverse computation of wind factors(wind speed and wind fetch length) to be robust and sufficiently precise for wave forecasting.

关键词： JONSWAP spectrum parameter identification least square method airborne LIDAR

Advanced Computational Methods of Rapid and Rigorous 3-D Inversion of airborne Electromagnetic Data

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Communications in Computational Physics 2008年第1期3卷 160-179页

作者： Leif H.Cox Michael S.Zhdanov Department of Geophysical Engineering Montana Tech of the University of Montana1300W Park StreetButteMT 59701-8997USA Department of Geology and Geophysics University of Utah135 S.1460 E.Rm 719Salt Lake CityUT 84112USA.

We develop a new computational method for modeling and inverting frequency domain airborne electromagnetic(EM)*** method is based on the contraction integral equation method for forward EM modeling and on inversion using the localized quasi-linear(LQL)approximation followed by the rigorous inversion,if *** LQL inversion serves to provide a fast image of the *** results are checked by a rigorous update of the domain electric field,allowing a more accurate calculation of the predicted *** the accuracy is poorer than desired,rigorous inversion follows,using the resulting conductivity distribution and electric field from LQL as a starting *** rigorous inversion iteratively solves the field and domain equations,converting the non-linear inversion into a series of linear *** test this method on synthetic and field *** results of the inversion are very encouraging with respect to both the speed and the accuracy of the algorithm,showing this is a useful tool for airborne EM interpretation.

关键词： Computational geophysics airborne electromagnetics inversion 3-D LQL rigorous

Spaceborne-airborne-ground-based" radar remote sensing experiment

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Chinese Science Bulletin 1995年第23期40卷 2012-2016页

作者：王超郭华东李林 Institute of Remote Sensing Applications Chinese Academy of Sciences Beijing 100101 China

Much work has been done on radar calibration in recent years since the inversion and classification algorithms rely heavily on the precision of measured radar data. In order to take the quantitative backscattering measurement, external calibration should be carried out At precent, one of the common calibration methods is the point-target method. However,

关键词： shuttle imaging radar airborne SAR ground-based scatterometer calibration.

RADIATION CHARACTERISTICS OF airborne SPIRAL ANTENNAS

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Journal of Electronics(China) 1994年第4期11卷 369-376页

作者：刘其中焦永昌李莉 Institute of Antennas Xidian University Xi'an 710071

The radiation fields of the Archimedean spiral antenna are derived by approximating the spiral with a series of semicircles. The computational formulae for calculating the radiation fields of the airborne spiral antennas are developed by using geometrical theory of diffraction (GTD). The calculated results are in good agreement with the experimental ones.

关键词： airborne Archimedean spiral antenna Radiation field Geometrical theory of diffraction (GTD)