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3D hand pose and shape estimation from monocular RGB via efficient 2D cues

Computational Visual Media 2024年第1期10卷 79-96页

作者： Fenghao Zhang Lin Zhao shengling Li Wanjuan su liman Liu Wenbing Tao Hubei Key Laboratory of Medical Information Analysis and Tumor Diagnosis&Treatment School of Biomedical EngineeringSouth Central Minzu UniversityWuhan430074China National Key Laboratory of science and Technology of Multi-spectral Information Processing School of Artificial Intelligence and AutomationHuazhong University of Science and TechnologyWuhan430074China

Estimating 3D hand shape from a single-view RGB image is important for many ***,the diversity of hand shapes and postures,depth ambiguity,and occlusion may result in pose errors and noisy hand *** full use of 2D cues such as 2D pose can effectively improve the quality of 3D human hand shape *** this paper,we use 2D joint heatmaps to obtain spatial details for robust pose *** also introduce a depth-independent 2D mesh to avoid depth ambiguity in mesh regression for efficient hand-image *** method has four cascaded stages:2D cue extraction,pose feature encoding,initial reconstruction,and reconstruction ***,we first encode the image to determine semantic features during 2D cue extraction;this is also used to predict hand joints and for ***,during the pose feature encoding stage,we use a hand joints encoder to learn spatial information from the joint ***,a coarse 3D hand mesh and 2D mesh are obtained in the initial reconstruction step;a mesh squeeze-and-excitation block is used to fuse different hand features to enhance perception of 3D hand ***,a global mesh refinement stage learns non-local relations between vertices of the hand mesh from the predicted 2D mesh,to predict an offset hand mesh to fine-tune the reconstruction *** and qualitative results on the FreiHAND benchmark dataset demonstrate that our approach achieves state-of-the-art performance.

关键词： hand 3D reconstruction deep learning image features 3D mesh

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Experimental investigation of viscous oil-water-sand flow in horizontal pipes:Flow patterns and pressure gradient

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Petroleum 2024年第2期10卷 275-293页

作者： tarek Ganat Petroleum and Chemical Engineering Department Sultan Qaboos University

Fluid production from unconsolidated reservoirs often leads in sand production,which poses a number of *** deposition in flowlines can result in significant pressure dips,pipe and facility damage,and obstructions that decrease *** research is needed to understand the movement and deposition of sand in oil-water-sand（O-W-s） *** article focuses on O-W-s flows in a 6-meter-long horizontal pipe with an inner diameter of 0.0381 *** study looks at the flow behavior of high viscosity oil-water（O-W）,water-sand（W-s）,and oil-water-sand（O-W-s） *** were carried out at 250 psig pressure in a laboratory flow test facility using various heavy synthetic oils（viscosities ranging from 3500 cP to 7500 cP at 25℃） and tap *** sand concentration varied from 1% to 10%,with an average sand particle diameter of 145 μm and material density of 2630 kg/*** cuts ranged from 0.0 to *** experimental results revealed a minor change in pressure gradient between（O-W） and（O-W-s） ***,increasing the sand concentration in（O-W-s） flow resulted in higher pressure *** reduction factor of pressure gradient indicated that the highest decrease in pressure drop occurred at higher superficial oil ***,a direct relationship was observed between the reduction factor and the decrease in water *** results also showed that the minimum required transportation velocity for sand slurry decreased with increasing superficial oil velocity,while the minimum transportation condition increased with higher sand *** comparison between the expected pressure gradient from Bannwart and McKibben et *** the actual experimental data demonstrated significant accuracy for the oil viscosities and superficial oil velocities used in the study.

关键词： slurry velocity Flow pattern Pressure gradient High viscosity Minimum transport condition

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A critical review towards the causes of the iron-based catalysts deactivation mechanisms in the selective oxidation of hydrogen sulfide to elemental sulfur from biogas

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Journal of Energy Chemistry 2024年第3期90卷 388-411,I0010页

作者： Mostafa tarek Janaina s.santos Victor Márquez Mohammad Fereidooni Mohammad Yazdanpanah supareak Praserthdam Piyasan Praserthdam Center of Excellence on Catalysis and Catalytic Reaction Engineering(CECC) Department of Chemical EngineeringFaculty of EngineeringChulalongkorn UniversityBangkok 10330Thailan High-Performance Computing Unit(CECC-HCU) Center of Excellence on Catalysis and Catalytic Reaction Engineering(CECC)Chulalongkorn UniversityBangkok 10330Thailand

Hydrogen sulfide(H_(2)s) not only presents significant environmental concerns but also induces severe corrosion in industrial equipment,even at low *** various technologies,the selective oxidation of hydrogen sulfide(sOH_(2)s) to elemental sulfur(s) has emerged as a sustainable and environmentally friendly *** to its unique properties,iron oxide has been extensively investigated as a catalyst for sOH_(2)s;however,rapid deactivation has remained a significant *** causes of iron oxide-based catalysts deactivation mechanisms in sOH_(2)s,including sulfur or sulfate deposition,the transformation of iron species,sintering and excessive oxygen vacancy formation,and active site loss,are thoroughly examined in this *** focusing on the deactivation mechanisms,this review aims to provide valuable insights into enhancing the stability and efficiency of iron-based catalysts for sOH_(2)s.

关键词： selective oxidation of H_(2)s Iron-based Catalysts Mechanism of deactivation sulfur or sulfate deposition Transformation of iron species sintering sDG 7

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Raindrop size Distributions in the Zhengzhou Extreme Rainfall Event on 20 July 2021:Temporal-spatial Variability and Implications for Radar QPE

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Journal of Meteorological Research 2024年第3期38卷 489-503页

作者： liman CUI Haoran LI Aifang sU Yang ZHANG Xiaona LYU Le XI Yuanmeng ZHANG Henan Key Laboratory of Agrometeorological support and Applied Technique China Meteorological AdministrationZhengzhou450003China state Key Laboratory of severe Weather Chinese Academy of Meteorological SciencesChina Meteorological AdministrationBeijing100081China Henan Meteorological Observatory Zhengzhou450003China

In this study,a regional Parsivel OTT disdrometer network covering urban Zhengzhou and adjacent areas is employed to investigate the temporal-spatial variability of raindrop size distributions(DsDs)in the Zhengzhou extreme rainfall event on 20 July *** rain rates observed by disdrometers and rain gauges from six operational sites are in good agreement,despite significant site-to-site variations of 24-h accumulated rainfall ranging from 198.3 to 624.1 *** Parsivel OTT observations show prominent temporal-spatial variations of DsDs,and the most drastic change was registered at Zhengzhou station where the record-breaking hourly rainfall of 201.9 mm over 1500-1600 LsT(local standard time)was *** hourly rainfall is characterized by fairly high concentrations of large raindrops,and the mass-weighted raindrop diameter generally increases with the rain rate before reaching the equilibrium state of DsDs with the rain rate of about 50 mm h^(−1).Besides,polarimetric radar observations show the highest differential phase shift(K_(dp))and differential reflectivity(Z_(dr))near surface over Zhengzhou station from 1500 to 1600 *** light of the remarkable temporal-spatial variability of DsDs,a reflectivity-grouped fitting approach is proposed to optimize the reflectivity-rain rate(Z-R)parameterization for radar quantitative precipitation estimation(QPE),and the rain gauge measurements are used for *** results show an increase of mean bias ratio from 0.57 to 0.79 and a decrease of root-mean-square error from 23.69 to 18.36 for the rainfall intensity above 20.0 mm h^(−1),as compared with the fixed Z-R *** study reveals the drastic temporal-spatial variations of rain microphysics during the Zhengzhou extreme rainfall event and warrants the promise of using reflectivity-grouped fitting Z-R relationships for radar QPE of such events.

关键词： extreme rainfall raindrop size distribution radar quantitative precipitation estimation(QPE)

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GsT family genes in jujube actively respond to phytoplasma infection

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Horticultural Plant Journal 2024年第1期10卷 77-90页

作者： Qipeng Wang liman Zhang Chaoling Xue Yao Zhang Xiangrui Meng Zhiguo Liu Mengjun Liu Jin Zhao College of Life science Hebei Agricultural UniversityBaodingHebei 071000China Hebei Key Laboratory of Plant Physiology and Molecular Pathology Hebei Agricultural UniversityBaodingHebei 071000China Research Center of Chinese Jujube Hebei Agricultural UniversityBaodingHebei 071000China

Jujube witches’broom(JWB)caused by phytoplasma has a severely negative effect on multiple metabolisms in *** GsT gene family in plants participates in the regulation of a variety of biotic and abiotic *** study aims to identify and reveal the changes in the jujube GsT gene family in response to phytoplasma ***,70 ZjGsTs were identified in the jujube genome and divided into 8 *** them,the Tau-class,including 44 genes,was the *** analysis indicated that Tau-class genes were highly conserved among species,such as Arabidopsis,cotton,chickpea,and *** chromosome location analysis,37.1%of genes were clustered,and 8 of 9 gene clusters were composed of Tau class *** RT-PCR,qRT-PCR and enzyme activity detection,the results showed that the expression of half(20/40)of the tested ZjGsTs was inhibited by phytoplasma infection in field and tissue culture conditions,and GsT activity was also significantly *** the resistant and susceptible varieties under phytoplasma infection,ZjGsTU49-ZjGsTU54 in the cluster IV showed opposite expression patterns,which may be due to functional divergence during *** upregulated genes(ZjGsTU45,ZjGsTU49,ZjGsTU59,and ZjGsTU70)might be involved in the process of jujube against *** yeast two-hybrid results showed that all 6 Tauclass proteins tested could form homodimers or ***,the comprehensive analysis of the jujube GsT gene family revealed that ZjGsTs responded actively to phytoplasma ***,some screened genes(ZjGsTU24,ZjGsTU49-52,ZjGsTU70,and ZjDHAR10)will contribute to further functional studies of jujube-phytoplasma interactions.

关键词： Chinese jujube GsT gene Family Phytoplasma Gene cluster Expression Protein interaction

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TACs自主创新引领新质生产力,赋能轨道交通高质量发展

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城市轨道交通研究 2024年第7期27卷 I0001-I0001,360页

作者：吴昊 ZHANG liman 上海富欣智能交通控制有限公司不详

TACs(列车自主运行系统)是指以列车为核心,采用资源管理理念,基于车车通信,以信号系统与车辆深度融合为特征,实现列车运行方式由自动化向自主化转变的一种全新系统制式。2024年4月26日,TACs示范工程——青岛地铁6号线开通,标志着采用以... 详细信息

TACs(列车自主运行系统)是指以列车为核心,采用资源管理理念,基于车车通信,以信号系统与车辆深度融合为特征,实现列车运行方式由自动化向自主化转变的一种全新系统制式。2024年4月26日,TACs示范工程——青岛地铁6号线开通,标志着采用以列车为核心、以资源交互为基础的新型列车控制系统已进入商用阶段。

关键词：资源管理理念列车控制系统 TACs 系统制式深度融合轨道交通青岛地铁自主化

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数字化技术引领城市轨道交通维保新模式

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城市轨道交通研究 2024年第S1期27卷 I0002-I0002,156页

作者：张郁 ZHANG liman(译) 上海申通地铁集团有限公司不详

上海城市轨道交通作为上海公共交通的重要组成部分(其出行量已占上海公共交通出行量的70%),其运营效率和安全性直接关系到广大市民的出行体验和生活质量。随着城市化进程的不断推进,上海轨道交通网络的规模和复杂性也在不断增加,面对高... 详细信息

上海城市轨道交通作为上海公共交通的重要组成部分(其出行量已占上海公共交通出行量的70%),其运营效率和安全性直接关系到广大市民的出行体验和生活质量。随着城市化进程的不断推进,上海轨道交通网络的规模和复杂性也在不断增加,面对高密度、高运能的要求,传统的运营和维护模式已经难以满足当前的需求。

关键词：城市轨道交通公共交通数字化技术出行量运营和维护上海轨道交通网络运能运营效率

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市域轨道交通姓什么

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城市轨道交通研究 2024年第1期27卷 I0001-I0001,276页

作者：宋敏华 ZHANG liman 中国城市轨道交通协会不详

当前,我国城镇化正进入到都市圈、城市群建设发展的新阶段。打造轨道上的都市圈,建设“1小时都市圈”,都要求干线铁路、城际铁路、市域轨道交通、城市轨道交通实现“四网融合”。“四网融合”将有力带动市域轨道交通的发展。从制式结构... 详细信息

当前,我国城镇化正进入到都市圈、城市群建设发展的新阶段。打造轨道上的都市圈,建设“1小时都市圈”,都要求干线铁路、城际铁路、市域轨道交通、城市轨道交通实现“四网融合”。“四网融合”将有力带动市域轨道交通的发展。从制式结构看,我国铁路运营线路已超过15万km,城市轨道交通也超过1万km.

关键词：城市轨道交通市域轨道交通干线铁路城际铁路都市圈城市群建设四网融合铁路运营线

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打造系列化、智能化市域列车平台

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城市轨道交通研究 2024年第5期27卷 I0001-I0001,204页

作者：李定南 ZHANG liman(译) 中车南京浦镇车辆有限公司党委不详

市域列车的最高速度可达200km/h,同时还能兼顾地铁列车的快起快停和快速乘降,对提高市域(郊)铁路运输效率、提高城市公共交通效率具有重要作用。中车南京浦镇车辆有限公司全新研制的市域CD型车列车基于城际动车组设计理念,车体结构采用... 详细信息

市域列车的最高速度可达200km/h,同时还能兼顾地铁列车的快起快停和快速乘降,对提高市域(郊)铁路运输效率、提高城市公共交通效率具有重要作用。中车南京浦镇车辆有限公司全新研制的市域CD型车列车基于城际动车组设计理念,车体结构采用动车组设计规范,可实现1500kN车体压缩强度性能和36 km/h的相对速度碰撞性能;应用了综合气密性设计技术,采用了高性能阻尼隔声材料,可有效提升列车隔音性能,全面提升乘坐舒适性;应用了包括智能照明、智能PIs(乘客信息系统)、智能检测、智能运维等智能化技术,以及多网融合、多屏融合、智能检测系统融合、主机融合等新技术。

关键词：智能检测智能照明多网融合隔声材料隔音性能智能化技术车体结构地铁列车

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Advancing sandstone reservoir compressibility prediction:A correlation-driven methodology

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Petroleum Research 2024年第2期9卷 273-279页

作者： tarek Ganat Meftah Hrairi Amr Badawy Vahid Khosravi Mohammed Abdalla Department of Petroleum Chemical Engineering Sultan Qaboos UniversityP.O.Box 50Al-Khod123MuscatOman Department of Mechanical and Aerospace Engineering International Islamic University MalaysiaP.O.Box 1050728Kuala LumpurMalaysia Reservoir Engineering section Petronas Carigali SDN BHDP.O.Box 10500088Kuala LumpurMalaysia Department of Chemical and Petroleum Engineering Faculty of EngineeringTechnologyand Built EnvironmentUCSI University56000Kuala LumpurMalaysia Chemical&Petroleum Engineering United Arab Emirates UniversityP.O.Box No.15551Al AinUAE

This study presents a correlation-based approach for predicting the compressibility of sandstone reservoir *** study proposes a matrix of new empirical equations that significantly improve the precision of measuring the pore volume compressibility,with the most optimal fit of results based on a cubic polynomial *** accuracy of the calculations was validated through comparison with actual data using root mean square method,and the suggested correlations significantly enhance the precise prediction of rock compressibility in sandstone *** this study,the source of data collection is consolidated and unconsolidated sandstone from East Asia offshore ***,variations in compressibility with net overburden pressure over the course of the field's lifespan have been *** results demonstrate the application of regression analysis in establishing a network of linkages between independent and dependent *** proposed correlations for consolidated and unconsolidated sandstones offer a remarkable improvement in the accurate calculation of rock compressibility compared to traditional laboratory procedures,with an average error of 2.5%compared to 5-10%for laboratory *** approach of this study offers a cost-effective and time-efficient alternative to remarkedly enhance the overall performance of sandstone reservoirs in the oil and gas industry.

关键词： Compressibility Consolidated and unconsolidated sandstone Rock properties Rock mechanics

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