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The influence of air supply inlet location on the spatial-temporal distribution of bioaerosol in isolation ward under three mixed ventilation modes

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Energy and Built Environment 2023年第4期4卷 445-457页

作者： Zhijian liu Tianci wang yongxin wang haiyang liu Guoqing Cao Song Tang Department of Power Engineering North China Electric Power UniversityBaodingHebei 071003China Institute of Building Environment and Energy China Academy of Building ResearchBeijing 100013China China CDC Key Laboratory of Environment and Population Health National Institute of Environmental HealthChinese Center for Disease Control and PreventionBeijing 100021China

The outbreak of COVID-19 and the spread of infectious pathogens through bioaerosols have once again aroused widespread concern *** ward is an important place to prevent the spread of infectious ***,infection of health care workers(HCWs)in the isolation ward often occurs,so it is ur-gent to carry out relevant research to reduce the cross-infection between HCWs and *** this paper,the temporal and spatial distribution characteristics of bioaerosols under three mixed ventilation modes in a single ward were studied,namely,upper supply side return air of Case 1 and side supply and side return ventilation are Case 2 and Case 3 *** results show that the removal efficiency of bioaerosol in the ventilation mode of Case 3,in which directional airflow is formed from the air supply inlet to the release source and then to the exhaust outlet,is 46.6%and 67.7%higher than that of Case 1 and Case 2,*** addition,ventilation methods based on mixed theory do not guarantee good air quality in the breathing zone(1.3 m to 1.7 m)of HCWs,which may increase the inhalation risk for *** is hoped that our results can provide some useful suggestions for optimizing the airflow layout of the isolation ward,reducing the risk of cross-infection,and virus elimination.

关键词： Bioaerosol Isolation ward Mixed ventilation Breathing zone Computational fluid dynamics

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Integration of light and hormone signaling pathways in the regulation of plant shade avoidance syndrome

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aBIOTECH 2021年第2期2卷 131-145页

作者： Yang liu Feresheeh Jafari haiyang wang Biotechnology Research Institute Chinese Academy of Agricultural SciencesBeijing 100081China State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources South China Agricultural UniversityGuangzhou 510642China Guangdong Laboratory for Lingnan Modern Agriculture Guangzhou 510642China

As sessile organisms,plants are unable to move or escape from their neighboring competitors under high-density planting ***,they have evolved the ability to sense changes in light quantity and quality(such as a reduction in photoactive radiation and drop in red/far-red light ratios)and evoke a suite of adaptative responses(such as stem elongation,reduced branching,hyponastic leaf orientation,early flowering and accelerated senescence)collectively termed shade avoidance syndrome(SAS).Over the past few decades,much progress has been made in identifying the various photoreceptor systems and light signaling components implicated in regulating SAS,and in elucidating the underlying molecular mechanisms,based on extensive molecular genetic studies with the model dicotyledonous plant Arabidopsis ***,an emerging synthesis of the field is that light signaling integrates with the signaling pathways of various phytohormones to coordinately regulate different aspects of *** this review,we present a brief summary of the various cross-talks between light and hormone signaling in regulating *** also present a perspective of manipulating SAS to tailor crop architecture for breeding high-density tolerant crop cultivars.

关键词： Arabidopsis Shade avoidance syndrome(SAS) Light Hormones Signaling

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Vessel fusion tracking with a dual-frequency high-frequency surface wave radar and calibrated by an automatic identification system

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Acta Oceanologica Sinica 2018年第7期37卷 131-140页

作者： ZHANG Hui liu yongxin JI Yonggang wang Linglin College of Computer Science Inner Mongolia University Hohhot 010021 China College of Electronic Information Engineering Inner Mongolia University Hohhot 010021 China The First Institute of Oceanography State Oceanic Administration Qingdao 266061 China

High-frequency surface wave radar（HFSWR） and automatic identification system（AIS） are the two most important sensors used for vessel *** HFSWR can be applied to tracking all vessels in a detection area,while the AIS is usually used to verify the information of cooperative *** of interference from sea clutter,employing single-frequency HFSWR for vessel tracking may obscure vessels located in the blind zones of Bragg *** changes in the detection frequencies constitutes an effective method for addressing this deficiency.A solution consisting of vessel fusion tracking is proposed using dual-frequency HFSWR data calibrated by the *** different systematic biases exist between HFSWR frequency measurements and AIS measurements,AIS information is used to estimate and correct the HFSWR systematic biases at each ***,AIS point measurements for cooperative vessels are associated with the HFSWR measurements using a JVC assignment *** the association results of the cooperative vessels,the systematic biases in the dualfrequency HFSWR data are estimated and ***,based on the corrected dual-frequency HFSWR data,the vessels are tracked using a dual-frequency fusion joint probabilistic data association（JPDA）-unscented Kalman filter（UKF） *** results using real-life detection data show that the proposed method is efficient at tracking vessels in real time and can improve the tracking capability and accuracy compared with tracking processes involving single-frequency data.

关键词： vessel tracking high-frequency surface wave radar automatic identification system joint probabilistic data association unscented Kalman filter

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Blockchain based federated learning for intrusion detection for Internet of Things

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Frontiers of Computer Science 2024年第5期18卷 109-119页

作者： Nan SUN Wei wang yongxin TONG Kexin liu School of Cyber Science and Technology Beihang UniversityBeijing 100191China School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100191China Zhongguancun Laboratory Beijing 100094China School of Computer Science and Engineering Beihang UniversityBeijing 100191China

In Internet of Things(loT),data sharing among different devices can improve manufacture efficiency and reduce workload,and yet make the network systems be more vulnerable to various intrusion *** has been realistic demand to develop an efficient intrusion detection algorithm for connected *** of existing intrusion detection methods are trained in a centralized manner and are incapable to identify new unlabeled attack *** this paper,a distributed federated intrusion detection method is proposed,utilizing the information contained in the labeled data as the prior knowledge to discover new unlabeled attack ***,the blockchain technique is introduced in the federated learning process for the consensus of the entire *** results are provided to show that our approach can identify the malicious entities,while outperforming the existing methods in discovering new intrusion attack types.

关键词： intrusion detection federated learning new attacks discovering blockchain

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Calculation of electric field effects on the Gibbs free energy of the Al-Li-Mg alloy

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Rare Metals 2007年第5期26卷 508-514页

作者： ZHANG Jianjun CHEN Zheng wang yongxin liu Bing LI Yongsheng School of Materials Science and Engineering Northwestern Polytechnical University Xi＇an 710072 China

Based on the Thomas-Fermi model,the calculation methods of the monatomic Gibbs free energy were found. The interior potential boundary condition under electric field was defined. The calculation methods of Gibbs free energy for the monatomic,compound,and solid solution with electric field were set up. Under the influence of electric field,the Gibbs free energy of Al is the most sensitive,followed by those of Li and Mg. At the solution temperature the Gibbs free energies of Al3Li and its elements under electric field are not symmetrical about the zero point of electric field,whereas at the aging temperature their values are symmetrical about the zero point of electric field. At the solution temperature near the zero point of electric field,the Gibbs free energy of Al3Li is higher than that of Al-2.14%Li. And at 460 K the Gibbs free energy of Al3Li is lower than that of Al-2.14wt.%Li under electric field. The Gibbs free energy of 1420 alloy decreases from both sides of electric field to the zero point at the aging temperature.

关键词： Al-Li-Mg alloy thermodynamics parameters Thomas-Fermi model electric field

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Distributed Sparse Signal Estimation in Sensor Networks Using H_∞-Consensus Filtering

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IEEE/CAA Journal of Automatica Sinica 2014年第2期1卷 149-154页

作者： haiyang Yu Yisha liu Wei wang Research Center of Information and Control Dalian University of Technology School of Information Science and Technology Dalian Maritime University

This paper is concerned with the sparse signal recovery problem in sensor networks, and the main purpose is to design a filter for each sensor node to estimate a sparse signal sequence using the measurements distributed over the whole network. A so-called 1-regularized H_∞filter is established at first by introducing a pseudo-measurement equation, and the necessary and sufficient condition for existence of this filter is derived by means of Krein space Kalman *** embedding a high-pass consensus filter into 1-regularized H∞filter in information form, a distributed filtering algorithm is developed, which ensures that all node filters can reach a consensus on the estimates of sparse signals asymptotically and satisfy the prescribed H∞performance constraint. Finally, a numerical example is provided to demonstrate effectiveness and applicability of the proposed method.

关键词： Kalman filters Sensors Estimation Mathematical model Sparse matrices Covariance matrices

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Electrostatic self-assembly of 2D/2D CoWO_(4)/g-C_(3)N_(4)p-n heterojunction for improved photocatalytic hydrogen evolution:Built-in electric field modulated charge separation and mechanism unveiling

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Nano Research 2022年第8期15卷 6987-6998页

作者： haiyang wang Ranran Niu Jianhui liu Sheng Guo Yongpeng Yang Zhongyi liu Jun Li Henan Institute of Advanced Technology College of ChemistryZhengzhou UniversityZhengzhou 450052China School of Chemistry and Environmental Engineering Wuhan Institute of TechnologyWuhan 430205China

Two-dimensional(2D)semiconductor heterojunctions are considered as an effective strategy to achieve fast separation of photoinduced ***,a novel CoWO_(4)/g-C_(3)N_(4)(CWO/CN)p–n junction was synthesized using an electrostatic selfassembly *** constructed 2D/2D p–n heterostructure had a rich hetero-interface,increased charge density,and fast separation efficiency of photoinduced *** in-situ Kelvin probe force microscopy confirmed that the separation pathway of photoinduced carriers through the interface obeyed an II-scheme charge transfer *** results and density functional theory calculations indicated the differences of work function between CWO and CN induced the generation of built-in electric field,ensuring an efficient separation and transfer process of photoinduced *** the optimized conditions,the CWO/CN heterojunction displayed enhanced photocatalytic H_(2)generation activity under full spectrum and visible lights irradiation,*** study provides a novel approach to design 2D/2D hetero-structured photocatalysts based on p–n type semiconductor for photocatalytic H_(2)generation.

关键词： p-n junction interfacial charge transfer two-dimensional/two-dimensional photocatalytic H_(2)generation CoWO_(4)/g-C_(3)N_(4)heterojunction

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Two highly efficient accumulation models of large gas fields in China

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Petroleum Science 2014年第1期11卷 28-38页

作者： wang Hongjun Bian Congsheng liu Guangdi Sun Mingliang Li yongxin Research Institute of Petroleum Exploration & Development CNPC China University of Petroleum

Based on reserve abundance,large gas fields in China can be divided into two types：type one of high abundance large gas fields,dominated by structural gas reservoirs; type two of low abundance large gas fields,dominated by stratigraphic and lithologic gas *** formation of these two types of large gas fields is related to the highly efficient accumulation of natural *** accumulation of high abundance gas fields is dependent on the rapid maturation of the source kitchen and huge residual pressure difference between the gas source kitchen and reservoir,which is the strong driving force for natural gas migration to *** the accumulation of low abundance gas fields is more complicated,involving both volume flow charge during the burial stage and diffusion flow charge during the uplift stage,which results in large area accumulation and preservation of natural gas in low porosity and low permeability *** conclusion should assist gas exploration in different geological settings.

关键词： Natural gas gas source kitchen highly efficient accumulation large gas field reserve abundance resource potential

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Biodegradable,superhydrophobic walnut wood membrane for the separation of oil/water mixtures

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Frontiers of Chemical Science and Engineering 2022年第9期16卷 1377-1386页

作者： Tong Xing Changqing Dong Xiaodong wang Xiaoying Hu Changrui liu haiyang Lv National Engineering Laboratory for Biomass Power Generation Equipment School of New EnergyNorth China Electric Power UniversityBeijing 102206China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China National Energy Biological Power Generation Group Corporation LTD Beijing 100052China

The preparation of environmentally friendly oil/water separation materials remains a great ***-drying of wood after lignin removal yields wood aerogels,which can be used as substrates to prepare fluorine-free environmentally friendly superhydrophobic materials,However,they are more suitable for absorption rather than filtration applications due to their poor strength.A study using cross-sections of pristine wood chips as substrates retains the original strength of wood,but the use of the cross-sectional of wood pieces limits their thickness,strength,and *** this paper,a degradable fluorine-free superhydrophobic film(*** contact angle of approximately 164.2°)with self-cleaning and abrasion resistance characteristics was prepared by a one-step method using pristine and activated walnut longitudinal section films as the substrate,with tetraethyl orthosilicate as a precursor and dodecyltriethoxysilane as a *** tensile strength results show that superhydrophobic films with pristine or activated wood substrates maintained the strength of pristine wood and were 2.2 times stronger than the wood aerogel *** addition,after cross-laminating the two samples,the films had the ability to separate oil and water by continuous filtration with high efficiency(98.5%)and flux(approximately 1.3×10^(3)L∙m^(‒2)∙h^(‒1)).The method has potential for the large-scale fabrication of degradable superhydrophobic filtration separation membranes.

关键词： wood nanotechnology superhydrophobic biodegradable surface modification oil/water separation

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Detection of pesticides on navel orange skin by surface-enhanced Raman spectroscopy coupled with Ag nanostructures

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International Journal of Agricultural and Biological Engineering 2016年第2期9卷 179-185页

作者： liu Yande Zhang Yuxiang wang haiyang Ye Bing Institute of Optics-Mechanics-Electronics Technology and Application East China Jiaotong UniversityNanchang 330013China

Residual pesticides such as phosmet and chlorpyrifos in fruit have become a public concern problem in recent *** this study,surface-enhanced Raman spectroscopy(SERS)was used to detect and characterize pesticides extracted from navel orange *** colloid was prepared for getting the SERS of phosmet and *** Raman signals of phosmet over a concentration range of 5 mg/L to 30 mg/L and chlorpyrifos over a concentration range of 5 mg/L to 20 mg/L were *** least squares(PLS)regression combined with different data preprocessing methods was used to develop quantitative *** the second derivative data preprocessing,the best prediction model of phosmet pesticide was achieved with a correlation coefficient(r)of 0.852 and the root mean square error of prediction(RMSEP)of 5.177 mg/*** best prediction model of chlorpyrifos pesticide was achieved with r of 0.843 and the RMSEP of 2.992 mg/L using the multiplicative scatter correction(MSC)and first derivative data *** study indicated that SERS coupled with Ag nanostructures is a potential tool for analysis of phosmet and chlorpyrifos pesticide residues.

关键词： pesticides residues detection silver colloid surface enhanced Raman spectroscopy navel orange food safety

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