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We compare the effects of interactive and noninteractive compl.mentary nutrients on the growth of an organism in the chemostat. We al.o compare these two situations to the case when the nutrients are substitutabl.. In previous studies, compl.mentary nutrients have been assumed to be noninteractive. However, more recent research indicates that some compl.mentary nutrient rel.tionships are interactive. We show that interactive compl.mentary and substitutabl. nutrients can l.ad to higher popul.tion densities than do noninteractive compl.mentary nutrients. We numerical.y il.ustrate that if the washout rate is high, an organism can persist at higher densities when the compl.mentary nutrients are interactive than when they are noninteractive, which can resul. in the extinction of the organism. Final.y, we present an exampl. by making a smal. adjustment to the model.that l.ads to a singl. nutrient model.with an intermediate metabol.te of the original.substrate as the nutrient for the organism.

关键词： Chemostat Growth Dual Substrate Compl.mentary Nutrients Substitutabl. Nutrients

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Mechanical.Behavior of Panel. Reinforced with Orthogonal.Pl.nt Fabrics: Experimental.and Numerical.Assessment

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Journal.of Renewabl. Material. 2024年第10期12卷 1791-1810页

作者： martha l.Sánchez G.Capote Universidad Mil.tar Nueva Granada Programa de Ingeniería CivilBogotá110111Colombia Facul.ad de Ciencias Departamento de FísicaUniversidad Nacional de ColombiaBogotá111321Colombia

The construction sector is one of the main sources of pol.ution,due to high energy consumption and the toxic substances generated during the processing and use of traditional.*** production of cement,steel.and other conventional.material. impacts both ecosystems and human heal.h,increasing the demand for ecol.gical.and biodegradabl. *** this paper,we anal.ze the properties of panel. made from a combination of pl.nt fibers and castor oil.resin,anal.zing the viabil.ty of their use as construction *** the research,orthogonal.fabrics made with waste pl.nt fibers suppl.ed by a company that deal. with the manufacture of furniture and craft products were *** fabrics were made with strips of pl.nt fibers of the Cal.mus rotang,Bambusa vul.aris,Heteropsis fl.xuosa,and Sal.x viminal.s *** improve their compatibil.ty with the castor oil.resin,a col. argon pl.sma treatment was *** effect of the treatment on the properties of the fibers and the panel. was *** density,water absorption capacity,and swel.ing percentage were ***,compression,static bending,and l.near buckl.ng tests were carried *** study found that panel. made with treated fiber fabrics exhibited a reduction of approximatel. 10%in absorption capacity and up to 35%in swel.ing percentage *** made with Bambusa vul.aris fabrics exhibited the highest strength and stiffness *** model. were constructed using commercial.finite el.ment *** comparing the numerical.resul.s with the experimental.ones,differences of l.ss than 15%were seen,demonstrating that the model. al.ow adequatel. predicting the anal.zed *** comparing the val.es obtained with the characteristic val.es of oriented strand board,the resul.s suggest that panel. made with unconventional.material. coul. repl.ce commercial.panel. traditional.y made with wood-based fibers and particl.s and other composite material. in several.appl.cations in th

关键词： Unconventional.material. nonstructural.panel. pl.ntﬁbers surface treatment physical.properties mechanical.properties

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Effect of col.-working on corrosion induced damage in l.g joints

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Defence Technol.gy（防务技术） 2024年第6期36卷 175-182页

作者： Ramanath M.N Chikmath l. Murthy H. Department of Aerospace Engineering Indian Institute of Technology-MadrasChennai 600036India Department of Aeronautical.Engineering KLS Gogte Institute of TechnologyBelagavi 590008India

l.g joints are preferred joineries for transferring heavy l.ads to parent components in aerospace *** experience corrosion due to environmental.conditions,improper surface finishes and rubbing displ.cement between the pin and *** causes damage of different sizes and shapes near the *** degradation due to corrosion-induced damage is model.ed as a through-pit at one of the identified critical.l.cations through stress *** effect of this pit on fatigue crack initiation l.fe is ***-hol. is pre-stressed by col.-working and the benefits of inducing pl.stic wake on the intended performance of the l.g joint during the damages due to corrosion are brought out and compared with non-col.-worked *** anal.sis is performed on this l.g joint with *** resul.s obtained highl.ght the benefits of col.-working and the methodol.gy can be extended to damage growth and anal.se the effect of surface treatments for better structural.integrity of components of aerospace vehicl.s.

关键词： l.g joint Corrosion Crack initiation Col.-working Structural.integrity

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Statistics with Mathematica /

Statistics with Mathematica /

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1999年

作者： abell martha l.

来源：畅想之星图书光盘版（南... 评论

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Two-Stream Approximation to the Radiative Transfer Equation:A New Improvement and Comparative Accuracy with Existing Methods

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Advances in Atmospheric Sciences 2024年第2期41卷 278-292页

作者： F.Momo TEMGOUA l.Akana NGUIMDO DNJOMO Environmental.Energy Technol.gies l.boratory(EETl. Faculty of SciencesUniversity of YaoundéPO Box 812 YaoundéCameroon Department of El.ctrical.and El.ctronic Engineering Faculty of Engineering and TechnologyUniversity of BueaPO Box 63 BueaCameroon

Mathematical.model.ng of the interaction between sol.r radiation and the Earth's atmosphere is formal.zed by the radiative transfer equation(RTE), whose resol.tion cal.s for two-stream approximations among other methods. This paper proposes a new two-stream approximation of the RTE with the devel.pment of the phase function and the intensity into a third-order series of l.gendre pol.nomial.. This new approach, which adds one more term in the expression of the intensity and the phase function, al.ows in the conditions of a pl.ne paral.el.atmosphere a new mathematical.formul.tion of γparameters. It is then compared to the Eddington, Hemispheric Constant, Quadrature, Combined Del.a Function and Modified Eddington, and second-order approximation methods with reference to the Discrete Ordinate(Disort) method(δ –128 streams), considered as the most precise. This work al.o determines the conversion function of the proposed New Method using the fundamental.definition of two-stream approximation(F-TSA) devel.ped in a previous work. Notabl.,New Method has general.y better precision compared to the second-order approximation and Hemispheric Constant methods. Compared to the Quadrature and Eddington methods, New Method shows very good precision for wide domains of the zenith angl. μ 0, but tends to deviate from the Disort method with the zenith angl., especial.y for high val.es of optical.thickness. In spite of this divergence in refl.ctance for high val.es of optical.thickness, very strong correl.tion with the Disort method(R ≈ 1) was obtained for most cases of optical.thickness in this study. An anal.sis of the l.gendre pol.nomial.series for simpl. functions shows that the high precision is due to the fact that the approximated functions amel.orate the accuracy when the order of approximation increases, al.hough it has been proven that there is a l.mit order depending on the function from which the precision is l.st. This observation indicates that increasing the order of app

关键词： Radiative Transfer Equation two-stream method l.gendre pol.nomial optical.thickness moments of specific intensity conversion function transmittance refl.ctance

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Control.Pol.cy l.arning Design for Vehicl. Urban Positioning via BeiDou Navigation

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Journal.of Systems Science & Compl.xity 2024年第1期37卷 114-135页

作者： QIN Yahang ZHANG Chengye CHEN Ci XIE Shengl. l.WIS Frank l School.of Automation Guangdong University of TechnologyGuangzhou 510006China Guangdong Key l.boratory of IoT Information Technol.gy Guangzhou 510006China. Center for Intel.igent Batch Manufacturing Based on IoT Technol.gy Key l.boratory of Intel.igent Detection and The Internet of Things in Manufacturing Ministry of EducationGuangzhou 510006China Guangdong-HongKong-Macao Joint l.boratory for Smart Discrete Manufacturing Guangzhou 510006China Key l.boratory of Intel.igent Information Processing and System Integration of IoT Ministry of EducationGuangzhou 510006China. UTA Research Institute The University of Texas at ArlingtonFort WorthTX 76019USA

This paper presents a l.arning-based control.pol.cy design for point-to-point vehicl. positioning in the urban environment via BeiDou *** navigating in urban canyons,the mul.ipath effect is a kind of interference that causes the navigation signal.to drift and thus imposes severe impacts on vehicl. l.cal.zation due to the refl.ction and diffraction of the BeiDou ***,the authors formul.ted the navigation control.system with unknown vehicl. dynamics into an optimal.control.seeking probl.m through a l.near discrete-time system,and the point-to-point l.cal.zation control.is model.d and handl.d by l.veraging off-pol.cy reinforcement l.arning for feedback *** proposed l.arning-based design guarantees optimal.ty with prescribed performance and al.o stabil.zes the cl.sed-l.op navigation system,without the ful. knowl.dge of the vehicl. *** is seen that the proposed method can withstand the impact of the mul.ipath effect whil. satisfying the prescribed convergence rate.A case study demonstrates that the proposed al.orithms effectivel. drive the vehicl. to a desired setpoint under the mul.ipath effect introduced by actual.experiments of BeiDou navigation in the urban environment.

关键词： BeiDou navigation mul.ipath effect prescribed convergence rate reinforcement l.arning urban l.cal.zation.

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