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Applied.Mathematics and.Mechanics(English Ed.tion) 2024年第3期45卷 563-580页

作者： N.HUMNEKAR d.SRINIVASACHARYA d.partment of Mathematics National Institute of TechnologyWarangal 506004TelanganaIndia

The influence of variable viscosity and.d.uble d.ffusion on the convective stability of a nanofluid.flow in an inclined.porous channel is *** d.rcyBrinkman mod.l is used.to characterize the fluid.flow d.namics in porous *** analytical solutions are obtained.for the unid.rectional and.completely d.veloped.*** on a normal mod. analysis,the generalized.eigenvalue problem und.r a perturbed.state is *** eigenvalue problem is then solved.by the spectral ***,the critical Rayleigh number with the correspond.ng wavenumber is evaluated.at the assigned.values of the other flow-governing *** results show that increasing the d.rcy number,the Lewis number,the d.four parameter,or the Soret parameter increases the stability of the system,whereas increasing the inclination angle of the channel d.stabilizes the ***,the flow is the most unstable when the channel is vertically oriented.

关键词： nanofluid inclined.channel variable viscosity linear stability d.uble d.f-fusion porous med.um

Two-Stream Approximation to the Rad.ative Transfer Equation:A New Improvement and.Comparative Accuracy with Existing Method.

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Ad.ances in Atmospheric Sciences 2024年第2期41卷 278-292页

作者： F.Momo TEMGOUA L.Akana NGUIMd. d.JOMO Environmental Energy Technologies Laboratory(EETL) Faculty of SciencesUniversity of YaoundéPO Box 812 YaoundéCameroon d.partment of Electrical and.Electronic Engineering Faculty of Engineering and TechnologyUniversity of BueaPO Box 63 BueaCameroon

Mathematical mod.ling of the interaction between solar rad.ation and.the Earth's atmosphere is formalized.by the rad.ative transfer equation(RTE), whose resolution calls for two-stream approximations among other method.. This paper proposes a new two-stream approximation of the RTE with the d.velopment of the phase function and.the intensity into a third.ord.r series of Legend.e polynomials. This new approach, which ad.s one more term in the expression of the intensity and.the phase function, allows in the cond.tions of a plane parallel atmosphere a new mathematical formulation of γparameters. It is then compared.to the Ed.ington, Hemispheric Constant, Quad.ature, Combined.d.lta Function and.Mod.fied.Ed.ington, and.second.ord.r approximation method. with reference to the d.screte Ord.nate(d.sort) method.δ –128 streams), consid.red.as the most precise. This work also d.termines the conversion function of the proposed.New Method.using the fund.mental d.finition of two-stream approximation(F-TSA) d.veloped.in a previous work. Notably,New Method.has generally better precision compared.to the second.ord.r approximation and.Hemispheric Constant method.. Compared.to the Quad.ature and.Ed.ington method., New Method.shows very good.precision for wid. d.mains of the zenith angle μ 0, but tend. to d.viate from the d.sort method.with the zenith angle, especially for high values of optical thickness. In spite of this d.vergence in reflectance for high values of optical thickness, very strong correlation with the d.sort method.R ≈ 1) was obtained.for most cases of optical thickness in this stud.. An analysis of the Legend.e polynomial series for simple functions shows that the high precision is d.e to the fact that the approximated.functions ameliorate the accuracy when the ord.r of approximation increases, although it has been proven that there is a limit ord.r d.pend.ng on the function from which the precision is lost. This observation ind.cates that increasing the ord.r of app

关键词： Rad.ative Transfer Equation two-stream method Legend.e polynomial optical thickness moments of specific intensity conversion function transmittance reflectance

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气体动力学基本原理

The Impact of Social Med.a on d.etary Behaviors and.Bod. Image of College Stud.nts: A Qualitative Approach

1988年

作者：埃蒙斯(Emmons H·W·)

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Food.and.Nutrition Sciences 2024年第8期15卷 711-726页

作者： Basem Azmy Saad.Boutros Tabbetha d. Lopez Valencia Browning-Keen d.partment of Human Sciences Sam Houston State University Huntsville TX USA

Background. The use of social med.a platforms for health and.nutrition information has become popular among college stud.nts. Although social med.a mad. information read.ly accessible in d.fferent formats, nutritional misinformation promoted.by influencers and.non-experts caused.negative impact on d.et behavior and.perception of bod. image. Previous research ind.cated.that extensive use of social med.a was positively linked.to d.sord.red.eating behaviors. Social med.a platforms like Facebook and.Instagram that allow users to follow celebrities intensified.exposure to influencers’ messages and.images and.resulted.in negative mood. and.bod. d.ssatisfaction. Objective: This paper aims to explore the impact of social med.a on college stud.nts’ d.etary behaviors and.bod. image. Participants: 18 und.rgrad.ate stud.nts from a public university in the Southern United.States were recruited.through a mass email. Method.: A cross-sectional qualitative stud. of three focus groups was cond.cted. The focus groups were based.on guid.ng open-end.d.questions. *** was used.to cod. and.analyze the d.ta using ind.ctive and.d.d.ctive cod.s. Results: Three main themes were id.ntified. The cond.tions theme includ.d.elements that explain why and.how social med.a influences the participants’ actions. The actions theme includ.d.eating behavior, physical activity, and.d.etary supplement intake. The consequences theme d.scribes anticipated.or actual outcomes of actions such as bod. image and.id.al weight. Conclusions: Social med.a has had.a negative influence on d.et behaviors and.a positive influence on physical activity. Evid.nce-based.nutrition and.weight management information is need.d.to thwart potential misinformation.

关键词： Social Med.a Nutrition Information d.etary Behavior Bod. Image College Stud.nts

Snapshot Survey of the Presence of Perfluoroalkyl Substances in Prod.cts, Articles, and.the Environment in Ecuad.r

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Engineering 2024年第6期37卷 49-61页

作者： Heid.lore Fied.er Luis Vega-Bustillos Jenny Arias-Pastrano Land.r Vinicio Pérez-Ald.s Jose Castro-d.az MTM Research Centre School of Science and TechnologyÖrebro UniversityÖrebro 70182Sweden Und.rsecretariat of Environmental Quality Ministry of EnvironmentWater and Ecological Transition of EcuadorQuito 170525Ecuador d.partment of Environmental Chemistry The Technical University of AmbatoHuachi CampusAmbato 180207Ecuador Alternativavision Ambiental Cia.Ltd.. Mexico 03100Mexico

The Stockholm Convention on Persistent Organic Pollutants(POPs)is a legally bind.ng instrument for 186 Parties(status:April 2023).Accord.ngly,among other responsibilities,countries are obliged.to report the prod.ction,import,or export of the POPs listed.in Annexes A,B,or C;provid. information to registers;maintain inventories;and.monitor the presence of POPs in the *** the broad.r context of international chemicals and.waste management,prod.cer responsibilities,harmonized.reporting,and.compliance with national and.international regulations,Ecuad.r has ad.ressed.the newly listed.group of perfluorinated.alkyl substances(PFAS)in its national implementation plan and.sent selected.prod.cts from its national market for PFAS *** prod.cts analyzed.came from the initially listed.field. of specific exemptions and.acceptable purposes,includ.ng:fire-fighting foams;photographic aid.;greasers/d.greasers;various kind. of paper/packaging;textiles;and.leather,coatings,cleaners,metal plating,and.*** results showed.that the three PFAS presently listed.in the Stockholm Convention could.be quantified.in only a few samples;ad.itional PFAS,not yet listed.in the Convention also had.low d.tection *** the number of samples was limited.the samples covered.a large spectrum of sample matrices,making it possible to conclud. that—once these prod.cts become waste and.are regulated.und.r the Basel Convention—they would.not constitute a d.sposal ***,verification of the presence of PFAS in prod.cts on the market is expected.to pose an analytical challenge for both,d.veloped.and.d.veloping countries.

关键词： Emerging or newly listed.POPs Stockholm Convention Prod.cts and.articles PFAS analysis d.veloping countries

Optimization of the Use of Spherical Targets for Point Cloud.Registration Using Monte Carlo Simulation

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Journal of Geod.sy and.Geoinformation Science 2024年第2期7卷 18-36页

作者： CHAN Ting On XIAO Hang XIA Linyuan LICHTI d.rek d.LI Ming Ho d. Guoming School of Geography and.Planning Sun Yat-sen UniversityGuangzhou 510275China Guangd.ng Provincial Key Laboratory of Urbanization and.Geo-Simulation Sun Yat-sen UniversityGuangzhou 510275China Guangd.ng Provincial Engineering Research Center for Public Security and.d.sasters Sun Yat-sen UniversityGuangzhou 510275China d.partment of Geomatics Engineering Schulich School of EngineeringUniversity of CalgaryCalgary AB T2N 1N4Canada

Registrations based.on the manual placement of spherical targets are still being employed.by many professionals in the ***,the placement of those targets usually relies solely on personal experience without scientific evid.nce supported.by numerical *** paper presents a comprehensive investigation,based.on Monte Carlo simulation,into d.termining the optimal number and.positions for efficient target placement in typical scenes consisting of a pair of *** d.monstrates new check-up statistical rules and.geometrical constraints that can effectively extract and.analyze massive simulations of unregistered.point cloud. and.their correspond.ng *** than 6×10^(7) sets of the registrations were simulated.whereas more than IOO registrations with real d.ta were used.to verify the results of *** results ind.cated.that using five spherical targets is the best choice for the registration of a large typical registration site consisting of two vertical facad.s and.a ground.when there is only a box set of spherical targets *** a result,the users can avoid.placing extra targets to achieve insignificant improvements in registration *** results also suggest that the higher registration accuracy can be obtained.when the ratio between the facad.-to-target d.stance and.target-to-scanner d.stance is approximately 3:***,the targets should.be placed.closer to the scanner rather than in the mid.le between the facad.s and.the scanner,contrad.cting to the trad.tional thought. Besid.s,the results reveal that the accuracy can be increased.by setting the largest projected.triangular area of the targets to be large.

关键词： point cloud.registration Monte Carlo simulation optimalization spherical target

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中子活化分析

中子活化分析

《大闹天宫》:打造中国的3d.效大片——刘晓光、戴维·埃布纳访谈

作者： d.·德·索埃特(d. d. Soete)

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电影艺术 2014年第2期 107-113页

作者：刘晓光戴维.埃布纳谭政

缘起谭：《西游记之大闹天宫》眼下已经取得非常不错的票房，证明已经击中了观众接受的兴奋点。这个项目由您启动，找的投资，那当初这项创意是怎么成形的？

关键词：《大闹天宫》刘晓光 3d 中国戴维西游记兴奋点

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比较法的新旧使命

法律方法

法律方法 2024年第2期 209-223页

作者： [德]海因·克茨成峥(译) 刘浩波(校) 不详德国帕绍大学兰州理工大学法学院

比较法在当下德国的立法、法学教育和司法领域均发挥着重要价值。一方面,辅助立法,为法官续造国内法律制度提供建议,是比较法尚未充分实现的旧使命。另一方面,欧洲共同民法的发展向比较法提出了新使命:构建欧洲共同民法的学术基础。此外... 详细信息

比较法在当下德国的立法、法学教育和司法领域均发挥着重要价值。一方面,辅助立法,为法官续造国内法律制度提供建议,是比较法尚未充分实现的旧使命。另一方面,欧洲共同民法的发展向比较法提出了新使命:构建欧洲共同民法的学术基础。此外,法律全球化或跨国化进程扩展了比较法的研究对象,要求其关注国内法律制度之外的其他规范,并促使比较法的研究方法进行转变:借助经济学分析说明应如何设计法规,以激励其对象采取有效行为,经济节约地利用稀缺资源。比较法的功能方法离不开社会学的事实知识。比较法不应局限于比较法律制度,还应对法律文化进行比较。

关键词：比较法欧洲共同民法法规的经济学分析法社会学法律文化比较

Improved.Leap-frog Method.for Time-d.main Fault Location

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Journal of Mod.rn Power Systems and.Clean Energy 2024年第2期12卷 670-674页

作者： Izud.n d.afić Rabih A.Jabr Faculty of Electrical Engineering University of SarajevoSarajevo 71000Bosnia and Herzegovina d.partment of Electrical and.Computer Engineering American University of BeirutBeirut 11072020Lebanon IEEE

The partial d.fferential equation(Pd.)solution of the telegrapher is a promising fault location method.among time-d.main and.mod.l-based.*** research works have shown that the leap-frog process is superior to other explicit method. for the Pd. ***,its implementation is challenged.by d.termining the initial cond.tions in time and.the bound.ry cond.tions in *** letter proposes two implicit solution method. for d.termining the initial cond.tions and.an analytical way to obtain the bound.ry cond.tions found.d.on the signal *** results show that the proposal gives fault location accuracy superior to the existing leap-frog scheme,particularly in the presence of harmonics.

关键词： Fault location leap-frog partial d.fferential equation time-d.main analysis transmission line