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Tomographic Data Fusion with CFD Simulations Associated with a Planar Sensor

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journal of Thermal Science 2017年第2期26卷 175-182页

作者： LiU j. LiU S. SUN S. ZHOU W. i.H.i Schlaberg WANG M. YAN Y. North China Electric Power University 2 Beinong RoadChangping DistrictBeijing 102206China

Tomographic techniques have great abilities to interrogate the combustion processes, especially when it is combined with the physical models of the combustion itself. in this study, a data fusion algorithm is developed to investigate the flame distribution of a swirl-induced environmental(EV) burner, a new type of burner for low NOx combustion. An electric capacitance tomography(ECT) system is used to acquire 3D flame images and computational fluid dynamics(CFD) is applied to calculate an initial distribution of the temperature profile for the EV burner. Experiments were also carried out to visualize flames at a series of locations above the burner. While the ECT images essentially agree with the CFD temperature distribution, discrepancies exist at a certain height. When data fusion is applied, the discrepancy is visibly reduced and the ECT images are improved. The methods used in this study can lead to a new route where combustion visualization can be much improved and applied to clean energy conversion and new burner development.

关键词： Process tomography data fusion EV burner flame

Eye contact and sociability data suggests that Australian dingoes were never domesticated

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Current Zoology 2022年第4期68卷 423-431页

作者： j William O Ballard Chloe Gardner Lucille Ellem Sonu Yadav Richard i Kemp Department of Ecology Environmentand EvolutionLatrobe UniversityMelbourneVIC 3086Australia Department of BioSciences The University of MelbourneMelbourneVIC 3010Australia School of Life and Environmental Sciences University of SydneyCamperdownNSW 2006Australia Bargo Dingo Sanctuary BargoNSW 2574Australia School of Biotechnology and Biomolecular Sciences UNSW SydneySydneyNSW 2052Australia School of Psychology UNSW SydneySydneyNSW 2052Australia

Dogs were the first animal to become domesticated by humans,and they represent a classic model system for unraveling the processes of *** compare Australian dingo eye contact and socialization with Basenji and German Shepherd dog(GSD)*** dingoes arrived in Australia 5,000–8,000 BP,and there is debate whether they were domesticated before their *** Basenji represents a primitive breed that diverged from the remaining breeds early in the domestication process,while GSDs are a breed dog selected from existing domestic dogs in the late *** conducted a 4-phase study with unfamiliar and familiar investigators either sitting passively or actively calling each *** found 75%of dingoes made eye contact in each *** contrast,86%of Basenjis and 96%of GSDs made eye *** also exhibited shorter eye-gaze duration than breed dogs and did not respond to their name being called ***,quantified as a canid coming within 1m of the experimenter,was lowest for dingoes and highest for *** sociability duration,dingoes spent less time within 1m of the experimenter than either breed *** compared with previous studies,these data show that the dingo is behaviorally intermediate between wild wolves and Basenji dogs and suggest that it was not domesticated before it arrived in ***,it remains possible that the accumulation of mutations since colonization has obscured historical behaviors,and dingoes now exist in a feralized retamed *** morphological and genetic data are required to resolve this conundrum.

关键词： Basenji dingo domestication German Shepherd dog eye gaze sociability

Development of mathematical model with a genetic algorithm for automatic arc welding process

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Acta Metallurgica Sinica(English Letters) 2010年第3期23卷 230-240页

作者： D.T.Thao i.S.Kim j.W.jeong j.H.Lee j.Y.Shim H.H.Kim Department of Mechanical Engineering Mokpo National University

This paper is to represent new algorithms to predict process parameters on top-bead width in robotic gas metal arc（GMA） welding *** models have been developed：linear, curvilinear and intelligent model based on full factorial design with two *** analysis was employed for optimization of the coefficients of linear and curvilinear models, while genetic algorithm（GA） was utilized to estimate the coefficients of an intelligent *** only the fitting of these models were checked and compared by using a variance test（ANOVA）, but also the prediction on top-bead width using the developed models were carried out based on the additional *** developed models were employed to investigate the characteristic between process parameters and top-bead *** solutions and graphical representation showed that the intelligent model developed can be employed for prediction of bead geometry in GMA welding process.

关键词： Top-bead width Genetic algorithm Multiple regression Robotic arc welding GMA welding

Hysteresis Loops and Phase Diagrams of the Spin-1 ising Model in a Transverse Crystal Field

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Chinese Physics Letters 2012年第1期29卷 194-197页

作者： S.Bouhou i.Essaoudi A.Ainane M.Saber j.j.de Miguel M.Kerouad Laboratoire de Physique des Materiaux et Modelisations des Systemes Unite Associee au CNRST-URAC 08Department of PhysicsFaculty of SciencesUniversity of Moulay IsmailB.P.11201MeknesMorocco Max-Planck-institut fur Physik Complexer Systeme Nohnitzer Str.38D-01187 DresdenGermany Dpto.Fisica de la Materia Condensada C-3 and Institut of Materials Sciences“Nicolas Cabrera”Univ.AutonomaCantoblanco E-28049-MadridSpain

Within the framework of the effective-field theory with a probability distribution technique,which accounts for the self-spin correlation functions,the ferromagnetic spin-1 ising model with a transverse crystal field on honeycomb,square and simple cubic lattices is *** have investigated the effect of the transverse crystal field on the phase diagrams,magnetization,hysteresis loops and χ_(z,h) of the system.A number of interesting phenomena of the system are discussed.

关键词： transverse ising crystal

Transverse approach between real world concentrations of SO_2, NO_2, BTEX, aldehyde emissions and corrosion in the Grand Mare tunnel

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journal of Environmental Sciences 2012年第7期24卷 1240-1250页

作者： i. Ameur-Bouddabbous j. Kasperek A. Barbier F. Harel B. Hannoyer GPM-UMR 6634 CNRS. UFR Science and Technology University of Rouen BP 12 76801 Saint Etienne du Rouvray Cedex France LCAE Chemistry Department Science Faculty of Tunis Campus Universitaire 2092 El Manar Tunis Tunisie DiRNO Rue de Verdun 76160 Darnetal France

With regard to automotive traffic, a tunnel-type semi enclosed atmosphere is characterized by a higher concentration of gaseous pollutants than on urban traffic roads and highlights the gaseous effluent species having an impact on material degradation. Therefore, a transverse approach between air quality and its consequences upon the longevity of materials is necessary, implying better knowledge of tunnel atmosphere and a better understanding of material degradation inside a tunnel for operating administration. Gaseous pollutant measurements carried out in a road tunnel in Rouen （Normandy） give the real world traffic concentrations of experimental exposure conditions. The sampling campaigns, achieved in summer and winter include SO2, NO2, BTEX and aldehyde analyses. Effluent profiles in the upward and downward tubes have been established. The current work shows that SO2, NO〉 formaldehyde, acetaldehyde, propanal and butanal must be considered in the degradation process of materials in a stuffy environment. As regards NO,, its concentration depends on the modification of the automotive fleet. The total aldehyde concentrations indicate no particular trend between the two bores. Formaldehyde, acetaldehyde, propanal, butanal and acrolein species are the most abundant species emitted by vehicles and represent 90% to 95% of the total aldehyde emissions.

关键词： SO2 tunnel study aldehydes NO2 BTEX atmospheric corrosion

Experimental and finite element analysis for fracture of coating layer of galvannealed steel sheet

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Transactions of Nonferrous Metals Society of China 2011年第A01期21卷 111-116页

作者： S.i.KiM j.U.HER Y.C.jANG Y.LEE Sheet Products and Process Research Group POSCO Techology Research Laboratory Department of Mechanical Engineering Chung-Ang University

Mechanical properties of galvannealed (GA) steel sheet used for automotive exposed panel and predicted failure phenomenon of its coating layer were evaluated using finite element method. V-bending test was performed to understand better the fracture of coating layer of GA steel sheet during plastic deformation. Yield strength of the coating layer was calculated by using a relative difference between hardness of coating layer measured from the nano-indentation test and that of substrate. To measure shearing strength at the interface between substrate and coating layer, shearing test with two specimens attached by an adhesive was carried out. Using the mechanical properties measured, a series of finite element analyses coupled with a failure model was performed. Results reveal that the fracture of coating layer occurs in an irregular manner at the region where compressive deformation is dominant. Meanwhile, a series of vertical cracks perpendicular to material surface are observed at the tensile stressed-region. it is found that 0.26-0.28 of local equivalent plastic strain exists at the coating and substrate at the beginning of failure. The fracture of coating layer depends on ductility of the coating layer considerably as well.

关键词： galvannealed steel sheet fracture simulation coating layer finite element analysis, failure model

THERMAL iMAGiNG STUDY OF SCALAR TRANSPORT iN SHALLOW WAKES

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journal of Hydrodynamics 2012年第1期24卷 17-24页

作者： CHONG K.j.Y UKTHUSYANTHAN N.i. LiANG Dong-fang TANG Hong-wu Department of Engineering University of CambridgeCambridge KW Ltd FetchamSurreyUK College of Water Conservancy and i tydropowcr Engineering Hohai University Nanjing 210098 China

The thermal imaging technique relies on the usage of infrared signal to detect the temperature *** temperature as a flow tracer,thermography is used to investigate the scalar transport in the shallow-water wake generated by an emergent circular *** imaging is demonstrated to be a good quantitative flow visualization technique for studying turbulent mixing phenomena in shallow waters.A key advantage of the thermal imaging method over other scalar measurement techniques,such as the Laser induced Fluorescence（LiF）and Planar Concentration Analysis（PCA）methods,is that it involves a very simple experimental *** dispersion characteristics captured with this technique are found to be similar to past studies with traditional measurement techniques.

关键词： environmental hydraulics shallow wake turbulent mixing thermal imaging vortex street

Structural geometry of orogenic gold deposits： implications for exploration of world-class and giant deposits

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Geoscience Frontiers 2018年第4期9卷 1163-1177页

作者： David i.Groves M.Santosh Richard j.Goldfarb Liang Zhang Orebusters Pty Ltd Gwelup 6018 Western Australia Australia State Key Laboratory of Geological Processes and Mineral Resources China University of Geosciences Beijing 100083 China Centre for Tectonics Resources and Exploration Dept. of Earth Sciences University of Adelaide SA 5005 Australia Division of interdisciplinary Science Faculty of Science Kochi University Kochi 780-8520 Japan

With very few exceptions, orogenic gold deposits formed in subduction-related tectonic settings in accretionary to collisional orogenic belts from Archean to Tertiary times. Their genesis, including metal and fluid source, fluid pathways, depositional mechanisms, and timing relative to regional structural and metamorphic events, continues to be controversial. However, there is now general agreement that these deposits formed from metamorphic fluids, either from metamorphism of intra-basinal rock sequences or de-volatilization of a subducted sediment wedge, during a change from a compressional to transpressional, less commonly transtensional, stress regime, prior to orogenic collapse. in the case of Archean and Paleoproterozoic deposits, the formation of orogenic gold deposits was one of the last events prior to cratonization. The late timing of orogenic gold deposits within the structural evolution of the host orogen implies that any earlier structures may be mineralized and that the current structural geometry of the gold deposits is equivalent to that at the time of their formation provided that there has been no significant post-gold orogenic overprint. Within the host volcano-sedimentary sequences at the province scale, world-class orogenic gold deposits are most commonly located in second-order structures adjacent to crustal scale faults and shear zones, representing the first-order ore-forming fluid pathways, and whose deep lithospheric connection is marked by lamprophyre intrusions which, however, have no direct genetic association with gold deposition. More specifically, the gold deposits are located adjacent to ～10°-25° district-scale jogs in these crustal-scale faults. These jogs are commonly the site of arrays of ～70° cross faults that accommodate the bending of the more rigid components, for example volcanic rocks and intrusive sills, of the host belts. Rotation of blocks between these accommodation faults causes failure of more competent units and/or re

关键词： Structural geometry Tectonic history Fluid pathways Orogenic gold deposits Exploration criteria

Unsteady mixed convective heat transfer of two immiscible fluids confined between long vertical wavy wall and parallel flat wall

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Applied Mathematics and Mechanics(English Edition) 2012年第7期33卷 931-950页

作者： j. C. UMAVATHi i. C. LiU M. SHEKAR Department of Mathematics Gulbarga University Department of Civil Engineering National Chi Nan University

The combined effects of thermal and mass convection of viscous incom- pressible and immiscible fluids through a vertical wavy wall and a smooth flat wall are analyzed. The dimensionless governing equations are perturbed into a mean part （the zeroth-order） and a perturbed part （the first-order）. The first-order quantities are ob- tained by the perturbation series expansion for short wavelength, in which the terms of the exponential order arise. The analytical expressions for the zeroth-order, the first-order, and the total solutions are obtained. The numerical computations are presented graph- ically to show the salient features of the fluid flow and the heat transfer characteristics. Separate solutions are matched at the interface by using suitable matching conditions. The shear stress and the Nusselt number are also analyzed for variations of the governing parameters. it is observed that the Grashof number, the viscosity ratio, the width ratio, and the conductivity ratio promote the velocity parallel to the flow direction. A reversal effect is observed for the velocity perpendicular to the flow direction.

关键词： mixed convection wavy wall immiscible fluid perturbation method