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Vehicular mobility patterns and their applications to Internet-of-Vehicles: a comprehensive survey

Science China(Information Sciences) 2022年第11期65卷 5-46页

作者： Qimei CUI Xingxing HU Wei ni Xiaofeng TAO Ping ZHANG Tao CHEN kwang-Cheng CHEN martin HAENGGI School of Information and Communication Engineering Beijing University of Posts and Telecommunications Department of Broadband Communication Peng Cheng Laboratory China Mobile Research Institute Digital Productivity and Services Flagship Commonwealth Scientific and Industrial Research Organization (CSIRO) VTT Technical Research Center of Finland Department of Electrical Engineering University of South Florida Department of Electrical Engineering University of Notre Dame

With the growing popularity of the Internet-of-Vehicles(IoV), it is of pressing necessity to understand transportation traffic patterns and their impact on wireless network designs and operations. Vehicular mobility patterns and traffic models are the keys to assisting a wide range of analyses and simulations in these applications. This study surveys the status quo of vehicular mobility models, with a focus on recent advances in the last decade. To provide a comprehensive and systematic review, the study first puts forth a requirement-model-application framework in the IoV or general communication and transportation networks. Existing vehicular mobility models are categorized into vehicular distribution, vehicular traffic, and driving behavior models. Such categorization has a particular emphasis on the random patterns of vehicles in space, traffic flow models aligned to road maps, and individuals’ driving behaviors(e.g., lane-changing and car-following). The different categories of the models are applied to various application scenarios, including underlying network connectivity analysis, off-line network optimization, online network functionality, and real-time autonomous driving. Finally, several important research opportunities arise and deserve continuing research efforts, such as holistic designs of deep learning platforms which take the model parameters of vehicular mobility as input features, qualification of vehicular mobility models in terms of representativeness and completeness, and new hybrid models incorporating different categories of vehicular mobility models to improve the representativeness and completeness.

关键词： vehicular mobility pattern Internet-of-Vehicles (IoV) traffic flow spatial point process trajectory prediction machine learning deep learning

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Molecular cloning,tissue distribution and the expression of cystine/glutamate exchanger(xCT,SLC7A11) in different tissues during development in broiler chickens

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Animal Nutrition 2020年第1期6卷 107-114页

作者： Janghan Choi Weiqi Li Brayden Schindell Liju ni Shangxi Liu Xiaoya Zhao Joshua Gong martin Nyachoti Chengbo Yang Department of Animal Science University of ManitobaWinnipegMBR3T 2N2Canada Shanghai Lab-Animal Research Center Shanghai201203China Guelph Research and Development Centre Agriculture Agri-Food CanadaGuelphONNIG 5C9Canada

The cystine/glutamate exchanger(xCT,SLC7 A11)is a component of the system X_c amino-acid antiporter that is able to export glutamate and import cysteine into *** xCT amino acid exchanger has received a lot of attention,due to the fact that cysteine is an essential substrate for the synthesis of glutathione(GSH),an endogenous antioxidant in *** objective of this research was to clone the full-length cDNA of chicken xCT,and to investigate the gene expression of xCT in different tissues,including intestinal segments of broiler chickens during *** full-length cDNA of chicken xCT(2,703 bp)was obtained from the jejunum by reverse transcription-PCR and *** tests showed that chicken xCT had 80.4%,80.2%,and 71.2%homology at the nucleotide level with humans,cattle,and rats,***,amino acid sequence analysis showed that chicken xCT protein is 86.4%,79.3%,and 75.6%homologous with humans,cattle,and rats,***,phylogenetic analysis indicated that chicken xCT genes share a closer genetic relationship with humans and cattle,than with *** chicken xCT protein has 12 transmembrane helixes,6 extracellular loops,and 5 intracellular *** mRNA of xCT was detected in all tissues,including intestinal segments,in which the mRNA expression of xCT was significantly higher(P<0.05)within the colon,compared to the jejunum and *** development,a linear pattern of changes regarding the levels of the xCT mRNA was found,indicating that there was an abundance of xCT within the duodenum(P<0.05).Furthermore,there were changes of the xCT mRNA abundance in the colon during development,which displayed linear and cubic patterns(P<0.05).These results indicated that xCT is widely expressed both in intestinal segments,as well as other organs that are not associated with nutrient *** investigation is needed to characterize the functional relevance of xCT activity in oxidative stress and inflammation in th

关键词： Amino acid Broiler chickens Cystine/glutamate transporter Development Gene expression

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nickel nanoparticles supported on nitrogen-doped carbon nanotubes are a highly active,selective and stable CO_(2) methanation catalyst

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Journal of Energy Chemistry 2021年第3期30卷 323-331页

作者： Julian Godde Mariia Merko Wei Xia martin Muhler Laboratory of Industrial Chemistry Ruhr University BochumD-44780 BochumGermany

CO_(2) methanation using nickel-based catalysts has attracted large interest as a promising power-to-gas *** nanoparticles supported on nitrogen-doped CNTs with ni loadings in the range from 10 wt% to 50 wt% were synthesized by impregnation,calcination and reduction and characterized by elemental analysis,X-ray powder diffraction,H_(2) temperature-programmed reduction,CO pulse chemisorption and transmission electron *** ni/NCNT catalysts were highly active in CO_(2) methanation at atmospheric pressure,reaching over 50% CO_(2) conversion and over 95% CH_(4) selectivity at 340℃ and a GHSV of50,000 mL g^(-1) h^(-1) under kinetically controlled *** small ni particle sizes below 10 nm despite the high ni loading is ascribed to the efficient anchoring on the N-doped *** optimum loading of 30 wt%-40 wt% ni was found to result in the highest ni surface area,the highest degree of conversion and the highest selectivity to methane.A constant TOF of 0.3 s^(-1) was obtained indicating similar catalytic properties of the ni nanoparticles in the range from 10 wt%to 50 wt% ni ***-term experiments showed that the ni/NCNT catalyst with 30 wt% ni was highly stable for 100 h time on stream.

关键词： CO_(2)methanation nickel nanoparticles Carbon nanotubes nitrogen doping

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Gas electrodes with nickel based current collectors for molten carbonate electrolyte thermo-electrochemical cells

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Journal of Energy Chemistry 2020年第2期29卷 34-42页

作者： Sathiyaraj kandhasamy Geir martin Haarberg Signe kjelstrup Asbjorn Solheim Department of Materials Science and Engineering Norwegian University of Science and Technology(NTNU)TrondheimNorway PoreLab Department of ChemistryNTNUTrondheimNorway Metal Production and Processing SINTEF IndustrySINTEFTrondheimNorway

Thermo-electrochemical cells with inexpensive molten carbonate electrolyte and(CO2|O2) gas electrodes allow the possible conversion of high temperature waste heat from industrial processes into *** cell containing eutectic(Li,Na)2CO3 electrolyte with solid Mg O dispersion delivers a large Seebeck coefficient of-1.7 m V/k. At present, the(CO2|O2) gas electrodes use metallic gold as current collectors in order to avoid the formation of interfering oxide layers during operation. For further reduction in energy generation cost, the gold current collectors should be replaced with an inexpensive and stable *** this study, the suitability of the(molten carbonate fuel cell) MCFC’s nickel-based cathodes to operate the molten-carbonate thermo-electrochemical cell, was investigated. ni current collectors were examined in two different states, as ni O and as lithiated ni O(Lixni1-xO). The ni O phase shows higher stability than the Lixni1-xO while the Seebeck coefficient remains above-1.2 m V/k.

关键词： High-temperature thermo-electrochemical cell Molten carbonate niO Lithiated niO

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Inequality in historical transboundary anthropogenic PM_(2.5) health impacts

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Science Bulletin 2022年第4期67卷 437-444,M0004页

作者： Lulu Chen Jintai Lin Randall martin Mingxi Du Hongjian Weng Hao kong Ruijing ni Jun Meng Yuhang Zhang Lijuan Zhang Aaron van Donkelaar Laboratory for Climate and Ocean-Atmospheric Studies Department of Atmospheric and Oceanic SciencesSchool of PhysicsPeking UniversityBeijing 100871China Department of Energy Environmental and Chemical EngineeringMckelvey School of EngineeringWashington University in St.LouisSt.LouisMO 63130USA Department of Physics and Atmospheric Science Dalhousie UniversityHalifaxNS B3H 4R2Canada Smithsonian Astrophysical Observatory Harvard-Smithsonian Center for AstrophysicsCambridgeMA 02138USA School of Public Policy and Administration Xi’an Jiaotong UniversityXi’an 710049China Department of Atmospheric and Oceanic Sciences University of CaliforniaLos AngelesCA 90095USA Shanghai Central Meteorological Observatory Shanghai 200030China

Atmospheric transport of fine particulate matter(PM_(2.5)),the leading environmental risk factor for public health,is estimated to exert substantial transboundary effects at *** the past several decades,human-produced pollutant emissions have undergone drastic and regionally distinctive changes,yet it remains unclear about the resulting global transboundary health *** we show that between 1950 and 2014,global anthropogenic PM_(2.5)has led to 185.7 million premature deaths cumulatively,including about 14%from transboundary *** four country groups at different affluence levels,on a basis of per capita contribution to transboundary mortality,a richer region tends to exert severer cumulative health externality,with the poorest bearing the worst net externality after contrasting import and export of pollution *** temporal changes in transboundary mortality and cross-regional inequality are *** to reduce PM_(2.5)-related transboundary mortality should seek international collaborative strategies that account for historical responsibility and inequality.

关键词： Health inequality Transboundary pollution Anthropogenic PM_(2.5)Historical mortality Affluence Atmospheric transport

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Source Rock Evaluation of Tight Oil in the Permian Lucaogou Formation,Jimsar Sag,Junggar Basin

Source Rock Evaluation of Tight Oil in the Permian Lucaogou ...

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作者： martin Harris 中国地质大学(北京)

学位级别：硕士

The Lucaogou Formation in Jimsar Sag has been identified as one of the most favorable areas for tight oil development in *** this study a total of 192,drill core samples were collected from fifteen（15）exploration wells drilled in the Lucaogou Formation with the purpose of evaluating the source potential and identify favorable hydrocarbon accumulation *** techniques performed includes;Rock-Eval pyrolysis,Induced Coupled Plasma Mass Spectroscopy（ICP-MS）,Gas Chromatography（GC）and Gas Chromatography-Mass Spectrometry（GC-MS）.Based on the results of this research work the Lucaogou Formation consists of organically rich,widespread source rocks in close contact with potential *** organic richness is indicated by total organic carbon（TOC）values ranging from 2-21%and above minimum chloroform bitumen "A" *** I and type II organic matter *** maturity measurements;vitrinite reflectance values between 0.65-1.07%Ro,indicate that the Lucaogou Formation is at peak to late stage thermal ***（Pr/Ph,Pr/n-Cp and Ph/n-C18）and n-C27,n-C28 and n-C29 sterane analysis indicates deposition in anoxic,hyper-saline lake *** is supported by V/V+ni ratio which ranged from 0.62 to 0.91,V/ni ratio ranging from 1-10 and V/Cr ratio＜*** pattern is similar indicating some provenance for studied rock *** physical parameter varies and type I,II and III reservoir types are *** areas with good potential for oil productivity "sweet spots" are present.

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Predictability of the Western North Pacific Subtropical High Associated with Different ENSO Phases in GloSea5

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Journal of Meteorological Research 2020年第5期34卷 926-940页

作者： Daquan ZHANG Gill M.martin Jose MRODRIGUEZ Zongjian kE Lijuan CHEN Laboratory for Climate Studies National Climate CenterChina Meteorological AdministrationBeijing 100081China Met Office Hadley Centre Exeter EX 13PBUK

The western North Pacific subtropical high(WNPSH) dominates the summer climate over East Asia. The intensity,position, and shape of WNPSH influence the spatiotemporal distributions of precipitation, temperature, and tropical cyclone activities in this region. This paper intends to investigate the performance of the Uk Met Office Global Seasonal forecast system version 5(GloSea5) in simulation/prediction of the WNPSH based on a hindcast dataset. Analyses of the hindcast data show a systematic bias in the mean circulation over West Pacific, with negative geopotential height anomalies over the western North Pacific(WNP) and cyclonic anomalies in the 850-hPa winds and water vapor transport, indicating a weakening and eastward shift of the WNPSH. Despite the model’s bias in the climatology, it well captured the interannual variability of the monthly and seasonal-mean intensity of the WNPSH and the position of its ridge line in boreal summer from 1993 to 2015. The seasonal hindcasts indicate that there is significant prediction skill at up to three-month lead time for both the intensity and position of the WNPSH ridge line. The relationship between the WNPSH and different phases of the El nino–Southern Oscillation(ENSO) in both the observational data and GloSea5 hindcasts was then investigated. The model captured the summer WNPSH anomalies well during most of the ENSO phases, except in the La nina decaying and neutral summers. The intensity of the anticyclone in the WNP is weak in the decaying phase of El nino in the GloSea5 hindcasts compared with the reanalysis data. GloSea5 is capable of representing the lagged teleconnection between El nino events in the previous winter and the intensity of the WNPSH in the following summer. Regression analysis reveals weakened negative sea surface temperature anomalies(SSTAs) over the WNP in GloSea5, which reduced the gradient between the tropical western Pacific and the tropical Indian Ocean, resulting in a weaker easterly anomaly a

关键词： western North Pacific subtropical high(WNPSH) Global Seasonal forecast system version 5(GloSea5) El nino–Southern Oscillation(ENSO) precipitation predictability

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Subtyping Cryptosporidium ryanae,a common pathogen in bovine animals

Subtyping Cryptosporidium ryanae,a common pathogen in bovine...

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2021中国畜牧兽医学会兽医寄生虫学分会第16次学术研讨会

作者： Xin Yang ni Huang Wen Jiang Xinrui Wang Na Li Yaqiong Guo martin kvá? Yaoyu Feng Lihua Xiao

Cryptosporidium ryanae is one of the most common species for cryptosporidiosis in ***,little is known of the genetic characteristics of *** due to the lack of subtyping *** the present study,the 60-kDa glycoprotein(gp60) gene of *** was identified in whole genome sequence data and analyzed for sequence characteristics using bioinformatics *** protein it encodes had some of the typical characteristics of GP60 proteins,with a signal peptide,a furin cleavage site,and a glycosylphosphatidylinositol anchor at the C terminus of the protein,and numerous O-glycosylation *** gene sequence was used in the development of a subtyping tool,which was used in characterizing *** from 110 specimens from dairy cattle,2 from beef cattle,6 from yaks and 4 from water buffaloes in ***,17 subtypes from eight subtype families were recognized,namely XXIa to *** host adaption was identified within this species,reflected by the unique occurrence of ⅩⅪa,ⅩⅪc and XXIh in dairy cattle,yaks and water buffaloes,*** geographical differences were detected in the distribution of subtype families in dairy cattle;specimens from southern China showed higher genetic diversity than from northern China,and the XXIa subtype family was only seen in dairy cattle in southern and eastern *** gp60-based subtyping tool should be useful in molecular epidemiological studies of the transmission of ***.

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In-process failure analysis of thin-wall structures made by laser powder bed fusion additive manufacturing

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Journal of Materials Science & Technology 2022年第3期98卷 233-243页

作者： Apratim Chakraborty Reza Tangestani Rasim Batmaz Waqas Muhammad Philippe Plamondon Andrew Wessman Lang Yuan Étienne martin University of Waterloo 200 University Avenue WestWaterlooON N2L 3G1Canada Polytechnique Montréal 2500 Chemin de PolytechniqueMontréalQC H3T 1J4Canada University of Arizona 1235 E.James E.Rogers WayTucsonAZ 85721-0012United States University of South Carolina 301 Main StreetColumbiaSC 29208United States

Fabrication of thin-wall components using the laser powder bed fusion(LPBF)additive manufacturing(AM)technology was investigated for two“hard-to-weld”high gamma prime ni-based superalloys RENé65(R65)and RENé108(R108).Simple block parts with wall thicknesses of 0.25 mm,1.00 mm,and5.00 mm are printed using a bidirectional laser scanning strategy without layer-wise *** with walls thinner than 5 mm fail before reaching the designated build *** indicate that reduction of limiting build height(LBH)corresponds to the reduction of part thickness and is unaffected by alloy *** the contrary,the number of internal micro-cracks along columnar grain boundaries in the build direction(BD)increases with part thickness and is significantly higher in R108 than *** findings suggest that reduced LBH in parts with thinner walls is not caused by internal micro-crack *** and finite element analysis(FEA)of the in-process thermal stresses show that the LBH trend is not explained by the conventional cracking *** suggest that part thickness affects stress distribution leading to more substantial distortion and consequent failure to add layers for continued fabrication of thinner parts.

关键词： Laser powder bed fusion Superalloys Thin-wall Residual stress Additive manufacturing

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Micro-mechanical deformation behavior of CoCrFeMnni high-entropy alloy

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Journal of Materials Science & Technology 2022年第5期100卷 237-245页

作者： kaiju Lu Ankur Chauhan Dimitri Litvinov Aditya Srinivasan Tirunilai Jens Freudenberger Alexander kauffmann martin Heilmaier Jarir Aktaa Institute for Applied Materials Karlsruhe Institute of Technology(KIT)Hermann-von-Helmholtz-Platz 176344 Eggenstein LeopoldshafenGermany Institute for Applied Materials Karlsruhe Institute of Technology(KIT)Engelbert-Arnold-Strasse 476131 KarlsruheGermany Leibniz Institute for Solid State and Materials Research Dresden(IFW Dresden) Helmholtzstr.20D-01069 DresdenGermany Institute of Materials Science Technische Universität Bergakademie FreibergGustav-Zeuner-Str.509599 FreibergGermany

In the present study,the micro-mechanical behavior of Co CrFeMnni high-entropy alloy was investigated using an in-house micro-tensile setup at room temperature and 550℃ at different strain *** properties are compared with those obtained using a commercial macro-tensile setup to check a potential sample size *** show that mechanical properties such as yield strength,ultimate tensile strength and uniform elongation are independent of the sample ***,the total elongation-to-failure of micro-samples is found to be lower than those of *** from this,the material exhibits serrated plastic flow,which is strain rate dependent in terms of the onset strain and shape of serrations at 550℃.Furthermore,transmission electron microscopy investigations were performed to correlate the occurrence of serrations to the observed distinct dislocation *** results provide direct evidence that dislocations are curved and hence effectively pinned and unpinned at the lowest applied strain rate,which might be responsible for the occurrence of serrated plastic flow.

关键词： High-entropy alloy Mechanical properties Micro-tensile Deformation mechanism Serration

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