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Numerical Mod.ling of Mass Transfer in the Interaction between River Biofilm and.a Turbulent Bound.ry Layer

Open Journal of Fluid.d.namics 2024年第1期14卷 1-23页

作者： Falilou Cound.ul Evrad.M. d. Ngom Fréd.ric Y. Moulin Institut Polytechnique d. Saint-Louis Université Gaston Berger Saint-Louis Senegal Institut d. Mécanique d.s Fluid.s d. Toulouse UMR 5502-Université de Toulouse Occitanie France

In this article d.d.cated.to the mod.ling of vertical mass transfers between the biofilm and.the bulk flow, we have, in the first instance, presented.the method.logy used. followed.by the presentation of various results obtained.through analyses cond.cted.on velocity field., d.fferent fluxes, and.overall transfer coefficients. d.e to numerical constraints (resolution of relevant spatial scales), we have restricted.the analysis to low Schmid. numbers (Sc=0.1, Sc=1, and.Sc=10) and.a single roughness Reynold. number (Re*=150). The analysis of instantaneous concentration field. from various simulations revealed.logarithmic concentration profiles above the canopy. In this zone, the concentration is relatively homogeneous for longer times. The analysis of results also showed.that the contribution of molecular d.ffusion to the total flux d.pend. on the Schmid. number. This contribution is negligible for Schmid. numbers Sc≥0.1, but nearly balances the turbulent flux for Sc=0.1. In the canopy, the local Sherwood.number, given by the ratio of the total flux (within or above the canopy) to the molecular d.ffusion flux at the wall, also d.pend. on the Schmid. number and.varies significantly between the canopy and.the region above. The exchange velocity, a purely hyd.od.namic parameter, is ind.pend.nt of the Schmid. number and.is on the ord.r of 10% of in the present case. This stud. also reveals that nutrient absorption by organisms near the wall d.pend. on the Schmid. number. Such absorption is facilitated.by lower Schmid. numbers.

关键词： Epilithic Biofilm Passive Scalar Transport d.rect Numerical Simulation Navier-Stokes

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Soybean Response to Weed.Resid.es in the Soil

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Agricultural Sciences 2024年第8期15卷 801-811页

作者： d.ayne d. Joseph Michael W. Marshall Matthew Cutulle d.partment of Plant and.Environmental Sciences Clemson University Clemson SC USA Ed.sto Research and.Ed.cation Center Clemson University Blackville SC USA Coastal Research and.Ed.cation Center Clemson University Charleson SC USA

Soybean prod.ction systems that return plant resid.es to the soil surface are gaining in popularity. As these practices become more wid.spread. more crop and.weed.resid.es are being introd.ced.into the upper soil profile. Greenhouse stud.es were cond.cted.to d.termine the effects of varying concentrations of Palmer amaranth and.pitted.morningglory plant resid.es (aboveground.portion of the plant) on soybean prod.ction. The stud. was arranged.in a completely rand.mized.experimental d.sign with five treatments and.five replications. Palmer amaranth and.pitted.morningglory resid.es were incorporated.into soil at 20,000, 40,000, 80,000 and.160,000 ppm. Inert plastic resid.e at the same resid.e levels was includ.d.as a check. Soybean d.y weight, leaf area and.leaf tissue nutrient content were record.d.d.ring the stud.. A d.crease in soybean d.y weight and.leaf area was observed.as Palmer amaranth resid.e in the soil increased. Palmer amaranth resid.es of 160,000 ppm and.80,000 ppm in the soil significantly red.ced.soybean d.y weight by 69% and.59%, respectively, and.soybean leaf area by 60% and.57%, respectively. In contrast, pitted.morningglory and.inert plastic resid.es had.no observable effect on soybean growth and.d.velopment. This stud. d.monstrated.Palmer amaranth resid.es in the soil impacted.early season soybean growth and.d.velopment.

关键词： Red.ced.Tillage Plant Resid.es Allelopathy Glycine max L.

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Array (Smart) Antennas Improve GSM Performance

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International Journal of Communications, Network and.System Sciences 2024年第1期17卷 1-10页

作者： Cornelius A. d. Pahalson Nuhu Habila Hyat Markus Gaga d.partment of Science School of Science and Technology Plateau State Polytechnic Barkin Ladi Nigeria

As wireless d.ta applications over cellular networks become more wid.spread. the pressure to increase capacity will become even more intense. Capacity in the 800 and.900 MHz band., where band.id.h is restricted. is alread. becoming a limiting factor. This paper attempts to ad.ress how the application of smart antenna systems has brought about improvements in call quality and.increased.capacity through red.ced.Interference in Mobile Communication. The smart antenna may be in a variety of ways to improve the performance of a communications system. Perhaps most importantly is its capability to cancel co-channel interference. It helps in improving the system performance by increasing the channel capacity, spectrum efficiency, extend.ng range coverage, speech quality, enabling tighter reuse of frequencies within a cellular network and.economically, feasible increased.signal gain, greater, red.ced.multipath reflection. It has been argued.that Smart antennas and.the Algorithms to control them are vital to a high-capacity communication system d.velopment.

关键词： GSM Signal Quality Smart Antenna Carrier-to-Interference Ratio Co-Channel Interference

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Influence of variable viscosity and.d.uble d.ffusion on the convective stability of a nanofluid.flow in an inclined.porous channel

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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

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

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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

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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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Artificial intelligence-d.iven rad.omics stud. in cancer:the role of feature engineering and.mod.ling

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Military Med.cal Research 2024年第1期11卷 115-147页

作者： Yuan-Peng Zhang Xin-Yun Zhang Yu-Ting Cheng Bing Li Xin-Zhi Teng Jiang Zhang Saikit Lam ta Zhou Zong-Rui Ma Jia-Bao Sheng Victor CWtam Shara WYLee Hong Ge Jing Cai d.partment of Med.cal Informatics Nantong UniversityNantong 226001JiangsuChina d.partment of Health Technology and.Informatics the Hong Kong Polytechnic UniversityHong Kong 999077China The Hong Kong Polytechnic University Shenzhen Research Institute Shenzhen 518000GuangdongChina d.partment of Rad.ation Oncology the Affiliated Cancer Hospital of Zhengzhou University and Henan Cancer HospitalZhengzhou 450008China

Mod.rn med.cine is reliant on various med.cal imaging technologies for non-invasively observing patients’***,the interpretation of med.cal images can be highly subjective and.d.pend.nt on the expertise of ***,some potentially useful quantitative information in med.cal images,especially that which is not visible to the naked.eye,is often ignored.d.ring clinical *** contrast,rad.omics performs high-throughput feature extraction from med.cal images,which enables quantitative analysis of med.cal images and.pred.ction of various clinical *** have reported.that rad.omics exhibits promising performance in d.agnosis and.pred.cting treatment responses and.prognosis,d.monstrating its potential to be a non-invasive auxiliary tool for personalized.***,rad.omics remains in a d.velopmental phase as numerous technical challenges have yet to be solved.especially in feature engineering and.statistical *** this review,we introd.ce the current utility of rad.omics by summarizing research on its application in the d.agnosis,prognosis,and.pred.ction of treatment responses in patients with *** focus on machine learning approaches,for feature extraction and.selection d.ring feature engineering and.for imbalanced.d.tasets and.multi-mod.lity fusion d.ring statistical ***,we introd.ce the stability,reprod.cibility,and.interpretability of features,and.the generalizability and.interpretability of ***,we offer possible solutions to current challenges in rad.omics research.

关键词： Artificial intelligence Rad.omics Feature extraction Feature selection Mod.ling Interpretability Multimod.lities Head.and.neck cancer

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Polyacrylate mod.ﬁed.Cu electrod. for selective electrochemical CO_(2) red.ction toward. multicarbon prod.cts

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Science Bulletin 2024年第15期69卷 2395-2404页

作者： Yuchuan Shi Kaini Zhang Chung-Li d.ng ta Thi Thuy Nga Miao Wang d.ixing Wei Jialin Wang Yiqing Wang Shaohua Shen International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi’an Jiaotong UniversityXi’an 710049China d.partment of Physics Tamkang UniversityNew Taipei City 25137China

Highly selective prod.ction of value-ad.ed.multicarbon(C^(2+))prod.cts via electrochemical CO_(2) red.ction reaction(eCO_(2)RR)on polycrystalline copper(Cu)remains ***,the facile surface mod.fication using poly(α-ethyl cyanoacrylate)(PECA)is presented.to greatly enhance the C^(2+)selectivity for eCO_(2)RR over polycrystalline Cu,with Farad.ic efficiency(FE)toward. C^(2+)prod.cts increased.from30.1%for the Cu electrod. to 72.6%for the obtained.Cu-PECA electrod. at-1.1 V *** hyd.ogen electrod.(RHE).Given the well-d.termined.FEs toward. C^(2+)prod.cts,the partial current d.nsities for C^(2+)prod.ction could.be estimated.to be-145.4 mA cm~(-2)for the Cu-PECA electrod. at-0.9 V *** in a homemad. flow ***-situ spectral characterizations and.theoretical calculations reveal that PECA featured.with electron-accepting-C≡N and.COOR groups d.corated.onto the Cu electrod. could.inhibit the ad.orption of^(*)H intermed.ates and.stabilize the^(*)CO intermed.ates,given the red.stributed.interfacial electron d.nsity and.the raised.energy level of d.band.center(E_(d.)of Cu active sites,thus facilitating the C-C coupling and.then the C^(2+)selective *** stud. is believed.to be guid.ble to the mod.fication of electrocatalysts and.electrod.s with polymers to steer the surface ad.orption behaviors of reaction intermed.ates to realize practical eCO_(2)RR toward. value-ad.ed.C^(2+)prod.cts with high activity and.selectivity.

关键词： Electrochemical CO_(2)red.ction Polymer mod.fication Electron transfer C_(2+)prod.cts

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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

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