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Simulations of Boiling Systems Using a lattice Boltzmann Method

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Communications in Computational Physics 2013年第3期13卷 696-705页

作者： l.Biferale P.Perlekar M.Sbragaglia F.Toschi Department of Physics and INFN University of Tor VergataVia della Ricerca Scientifica 100133 RomeItaly Department of Physics and Department of Mathematics and Computer Science Eindhoven University of Technology5600 MB EindhovenThe Netherlands

We report about a numerical algorithm based on the lattice Boltzmann method and its applications for simulations of turbulent convection in multi-phase *** discuss the issue of’latent heat’definition using a thermodynamically consistent pseudo-potential on the *** present results of numerical simulations in 3D with and without boiling,showing the distribution of pressure,density and temperature fluctuations inside a convective cell.

关键词： lattice Boltzmann equation boiling thermal convection

Photo activated disinfection efficiency of low-intensity laser and comprehensive prevention of caries and gingivitis in adolescents using bracket system

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Journal of Innovative Optical Health Sciences 2015年第3期8卷 9-18页

作者： Dmitry Ye.Suetenkov Anna P.Petrova Tatyana l.Kharitonova V.I.Razumovsky saratov state medical university 410012 russia

It is very important to study the problem of caries and gingivitis in adolescents who are beingtreated for orthodontic pathology with bracket *** method of combined treatmentwhich incorporates the use of medicine and laser therapy has been proved effective in *** research aims to study clinical aspects of the effectiveness of the combinedinfuence of the low-intensity laser"OPTODAN"with a wavelength of 0.85μm(Scientific De-velopment and Production Center*VEND",Saratov,Russia)in carries *** researchalso aims to study the disinfection method of PAD with"FotoSan"("CMS Dental",Denmark,with a wavelength of 625-635 nm,where toluidine blue is used as photosensitizer molecules)combined with regular measure to prevent gingivitis in adolescents being treated for orthodonticpathology with bracket *** paper presents the results of 1.5 years of clinical study of 60i2-13-year-old *** were examined before and after the orthodontic treatment:theirdecayed,missing,flle teeth(DMFT),decayed,missing,flle tooth surfaces(DMFS)index andhygiene status(OHI-S)were calculated,gum inflammations were *** the ortho-dontic treatment,their mouths were *** orthodontic appliances were placed,thechildren were randomly divided into two groups of 30 *** of the first group,whilebeing treated with braces,took traditional preventative measures against gum inflammation andcaries:occupational hygiene,local antiseptics(0.05%chlorhexidine solution),the use of *** and phosphorus containing applications four times a *** children of the secondgroup,along with the traditional scheme of preventive measures,were treated with the devices"FotoSan"and*Optodan".Results of clinical examination of the second group have accuratelyproved decrease in the growth of dental caries intensity and surface caries intensity(ADMFT,ADMFS)and in gingivitis level at the end of the orthodontic *** the results of ourclinical

关键词： Children orthodontic treatment laser caries gingivitis prophylaxis

Smart composite antibacterial coatings with active corrosion protection of magnesium alloys

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Journal of Magnesium and Alloys 2022年第12期10卷 3589-3611页

作者： A.S.Gnedenkov S.l.Sinebryukhov V.S.Filonina N.G.Plekhova S.V.Gnedenkov Institute of Chemistry of FEB RAS 159 Pr.100-letiya VladivostokaVladivostok690022Russia

A new method of the formation of composite coatings with the function of active corrosion protection of magnesium alloys was developed using the plasma electrolytic oxidation(PEO) method. Susceptibility of PEO-layers to pitting formation was evaluated using localized electrochemical methods(SVET/SIET). The morphological features and electrochemical properties of composite coatings were studied using SEM/EDX, XRD, micro-Raman spectroscopy and EIS/PDP measurements, respectively. The effect of surface layers impregnation with corrosion inhibitor on their protective properties in a corrosive environment was established. Additional protection was achieved using controllable coating pore sealing with polymer. It was found that the polymer treatment of the PEO-layer does not reduce the inhibitor’s efficiency. The formed protective composite inhibitor-and-polymer-containing layers decrease the corrosion current density of a magnesium alloy in a 3 wt.% Na Cl solution to three orders of magnitude. This predetermines the prospect of new smart coatings formation that significantly expand the field of application of electrochemically active materials. The mechanism of smart composite coating corrosion degradation was established. The antibacterial activity of the inhibitor-containing coatings against S. aureus methicillin-resistant strain was proved using the in vitro model. These protective layers are promising for reducing the incidence of implant-associated infections.

关键词： Magnesium alloy Plasma electrolytic oxidation Corrosion inhibitor Self-healing Protective coatings

Exploiting rotational asymmetry for sub-50 nm mechanical nanocalligraphy

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Microsystems & Nanoengineering 2021年第5期7卷 61-68页

作者： Nikolaos Farmakidis Jacob l.Swett Nathan Youngblood Xuan li Charalambos Evangeli Samarth Aggarwal Jan A.Mol Harish Bhaskaran Department of Materials University of OxfordParks RoadOxford 0X13PHUK Department of Physics Queen Mary University of LondonLondon El 4NSUK

Nanofabrication has experienced extraordinary progress in the area of lithography-led processes over the last decades,although versatile and adaptable techniques addressing a wide spectrum of materials are still *** probe lithography(SPl)offers the capability to readily pattern sub-100 nm structures on many surfaces;however,the technique does not scale to dense and multi-lengthscale ***,we demonstrate a technique,which we term nanocalligraphy scanning probe lithography(nc-SPl),that overcomes these ***-SPl employs an asymmetric tip and exploits its rotational asymmetry to generate structures spanning the micron to nanometer lengthscales through real-time linewidth *** specialized tip geometries and by precisely controlling the patterning direction,we demonstrate sub-50 nm patterns while simultaneously improving on throughput,tip longevity,and reliability compared to conventional SPl We further show that nc-SPl can be employed in both positive and negative tone patterning modes,in contrast to conventional *** underlines the potential of this technique for processing sensitive surfaces such as 2D materials,which are prone to tip-induced shear or beam-induced damage.

关键词： lithography tuning versatile

Payenia Quaternary flood basalts(southern Mendoza, Argentina)：Geophysical constraints on their volume

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Geoscience Frontiers 2016年第5期7卷 775-782页

作者： Mauro G.Spagnuolo Darío l.Orts Mario Gimenez Andres Folguera Victor A.Ramos Instituto de Estudios Andinos Don Pablo Groeber (I DEAN) UBA-CONICET Argentina Instituto de Investigacion en Paleobiologia y Geologia Universidad Nacional de Rio Negro - CONICET Argentina Instituto Geofisico y Sismologico Ing. Volponi Universidad Nacional de San Juan. CONICET Argentina

The Quaternary volcanic province of Payenia is located in southern Mendoza and northern Neuquén provinces of Argentina and is characterized by a dominant basaltic composition. The volcanic province covers an area larger than 40,000 km2 and its origin and evolution has been the center of several *** this study we analyzed gravity data together with more accurate volcanic volumes calculations in order to investigate the subsurface structure of the Payenia volcanic province. The volume of material was calculated using digital elevation models and geographic information system（GIS） techniques to estimate the volume of material erupted and then, with those values, make an estimation of the intrusive material that could be located within the crust. The results of the calculations were compared with different 2D-sections constructed to model the gravity data and compare with the observed satellite gravity. After evaluating different models which have been generated to match both： the observed gravity data and the subsurface material calculated, we discuss those that best fit with observation. The results clearly indicate that the lithosphere is attenuated below the region.

关键词： Payenia Gravimetric model Plume Uplift Andes

Intrinsic relationship of vorticity between modes A and B in the wake of a bluff body

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Theoretical & Applied Mechanics letters 2018年第5期8卷 320-325,362页

作者： l.M.lin S.Y.Shi Y.X.Wu Key laboratory for Mechanics in Fluid Solid Coupling Systems Institute of MechanicsChinese Academy of Sciences School of Engineering Sciences University of Chinese Academy of Sciences

The intrinsic physical relationship of vorticity between modes A and B in the three-dimensional wake transition is *** numerical simulations for the flow past a square-section cylinder are carried out at Reynolds numbers of 180 and 250,associated with modes A and B,*** on the analysis of spacial distributions of vorticity in the near wake,characteristics of the vertical vorticity in modes A and B are ***,the relationship of three vorticity components with specific signs is summarized into two sign laws,as intrinsic physical relationships between two instability *** the theory of vortex-induced vortex,such two sign laws confirm that there are two and only two kinds of vortex-shedding patterns in the near wake,just corresponding to modes A and *** brief,along the free stream direction,mode A can be described by the parallel shedding vertical vortices with the same sign,while mode B is described by the parallel shedding streamwise vortices with the same ***,it is found out that the|-type vortex is a basic kind of vortex structure in both modes A and B.

关键词： Mode A Mode B Wake Bluff body Sign law

Seismicity pattern of the Betic Cordillera(southern Spain) derived from the fractal properties of earthquakes and faults

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Earthquake Science 2010年第4期23卷 309-323页

作者： J Henares Romero C lópez Casado J Badal J A Peláez Department of Theoretical Physics and Cosmos University of Granada Physics of the Earth Sciences BUniversity of Zaragoza Department of Physics Higher Polytechnic SchoolUniversity of Jaén

Several studies on earthquake occurrence and associated faulting have demonstrated that both phenomena have a scale-invariant behavior which can be analyzed by means of a set of non-integer dimensions （Dq） describing their fractal properties and the calculation ofmulti-fractal spectra. It is the case that the behavior of these spectra is asymptotic at the ends of the variation interval of q, which is a real number that enters into the definition of the partition function of the dataset. The difference between the extreme values, called multi-fractal spectrum slope, is used to investigate the heterogeneity of the spatial distribution of earthquakes and fault systems. In this paper we focus on the Betic Cordillera, southeastern Spain, which is commonly considered the contact between the Eurasian and African plates and has an important seismic activity in the context of the Iberian Peninsula. Some of the most conspicuous Iberian earthquakes, such as the 1829 mb6.3 Torrevieja and the 1884 mb6.1 Alhama de Granada earthquakes occurred in this mountain range and both reached intensity X. The pre- sent work implies a new analysis based on the slope of multi-fractal spectra and referred to the historical seismicity of the re- gion, specifically b-value （frequency distribution of earthquakes respect to magnitude）, epicentral location, seismic energy and faulting. On this basis we propose a seismotectonic zonation that is contrasted with the stress state and the geodynamical evolution of the Betic Cordillera.

关键词： fractal dimensions multi-fractal spectrum slope seismotectonic Betic Cordillera

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对FAO推荐的作物系数计算方法的验证

农业工程学报 2000年第5期16卷 26-30页

作者：刘钰 l.S.Pereira 中国水利水电科学研究院水利所葡萄牙里斯本技术大学农学院农业工程系

作物系数是计算作物需水量必不可少的参数。该文介绍了 FAO近期推荐的确定作物系数的 2种计算方法 ,一种是比较简单实用的分段单值平均法 ,另一种是比较复杂但相对准确的双值作物系数法。用河北省雄县灌溉试验站的冬小麦、夏玉米田间土... 详细信息

作物系数是计算作物需水量必不可少的参数。该文介绍了 FAO近期推荐的确定作物系数的 2种计算方法 ,一种是比较简单实用的分段单值平均法 ,另一种是比较复杂但相对准确的双值作物系数法。用河北省雄县灌溉试验站的冬小麦、夏玉米田间土壤水分观测资料计算作物实际腾发量 ,对上述 2种确定作物系数的方法进行了检验。计算的作物系数与雄县试验站的实测结果基本接近 ,从而初步证明了在缺少实测资料的情况下可以采用

关键词：作物系数计算方法水量平衡冬小麦夏玉米

An evaluation of mass,number concentration,chemical composition and types of particles in a cafeteria before and after the passage of an antismoking law

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Particuology 2013年第5期11卷 527-532页

作者： Jorge Pey Barend l.van Drooge Anna Ripollb Teresa Moreno Joan O.Grimalt Xavier Querol Andres Alastuey Department of Epidemiology Lazio Regionvia S.Costanza5300198 RomeItaly Institute of Environmental Assessment and Water Research.ID/EA-CSIC C/Jordi Girona.18-2608034 BarcelonaSpain

This study assessed air quality indicators before and after enactment of the Spanish anti-smoking law. Mass and number concentrations and the chemical composition of particles were evaluated. Microscopy analyses were also conducted. Real time concentrations of PMlo, PM2.s, PM1 and ultrafine particles were measured under ventilated and non-ventilated conditions and PMlo samples were collected for detailed inorganic and organic chemical characterization. Before enactment of the law in 2010, tobacco smoke produced significant indoor ambient particulate matter pollution, with elevated particulate matter mass concentrations （PM10 and PM1 concentrations of 122-220 and 48-85 Dg/m3, respectively） and ultrafine particle numbers （75,000 and 48,000 cm ~ under ventilated and non-ventilated conditions, respectively）. Typical tobacco smoke tracers including iso- and anteiso-alkanes and elements including la and Ce from the ignition of lighters were abundant. Additionally, several toxic substances derived from tobacco smoke, including Cd （3.1 ng/m3） and benzo[a]pyrene （1.0 ng/m3） were present at concentrations approximately 10 times greater than those measured after enactment of the anti-smoking law. The anti-smoking law sig- nificantly reduced exposure to potentially toxic compounds by approximately 90%. This law is expected to have a positive health impact, particularly for people who spend considerable time in affected envi- ronments, such as employees.

关键词： Indoor airParticulate matterUltrafine particlesNucleationCoagulation-condensationEnvironmental tobacco smoke