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Journal articles on the topic 'Stream conservation Mathematical models'

Author: Grafiati

Published: 10 December 2022

Last updated: 19 July 2025

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1

ALI MUNZER, SULEIMAN, D. S. BEGLYAROV, and R. R. SHAKIROV. "FEATURES AND ANALYSIS OF STUDIES OF FISH PROTECTION COMPLEX FOR WATER RECEIVERS OF LARGE HIGH-PRESSURE HYDROELECTRIC POWER PLANTS." Prirodoobustrojstvo, no. 2 (2022): 86–93. http://dx.doi.org/10.26897/1997-6011-2022-2-86-93.

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Development of effective fish protection measures at water intakes is one of the main directions of fish resources conservation and reproduction in inland water bodies of the country. Its complexity is associated with the involvement of many related disciplines: ichthyology, physiology, hydrobiology, ecology, hydraulics, hydrology, etc. In the process of solving the problem of standardization of information to be used for creating mathematical models for forecasting potential impact of water intakes with fish protection on aquatic ecosystem. The article gives a review of the research on the te

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Bondarenko, A., M. Savin, O. Supotnitskaya, and L. Yantseva. "ON COMBINED BURNING RATE OF LIQUID SODIUM STREAM AND POOL." PROBLEMS OF ATOMIC SCIENCE AND TECHNOLOGY. SERIES: NUCLEAR AND REACTOR CONSTANTS 2019, no. 1 (2019): 224–29. http://dx.doi.org/10.55176/2414-1038-2019-1-224-229.

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Sodium fires with heat and fume release often happen at coolant circuit rupture of sodium fast reactor. At nuclear power plant with the sodium fast reactor the more probable scenario of sodium fire is considered burning of falling from damaged pipeline liquid sodium stream and the pool formed under it. The simple models for sodium fire which contains minimum of phenomenological parameters and gives the opportunity to get the upper limits of heat generation and amount of aerosol generated at sodium fire are more preferable. The physical and mathematical model for estimation a combined burning r

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Timakova, R. T. "Adaptive modeling of experimental conditions in the processing of food products (chilled fish) by the flow of accelerated electrons." Proceedings of the Voronezh State University of Engineering Technologies 83, no. 1 (2021): 17–22. http://dx.doi.org/10.20914/2310-1202-2021-1-17-22.

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The use of mathematical modeling in various branches of the food industry as an effective tool for the policy of resource conservation of food systems is an innovative solution in the field of improving the efficiency of existing food production technologies based on established patterns in the production process. The issues of operational quality control in the process of processing food products with a stream of accelerated electrons in the absence of radiation doses regulated by standards, except for certain types of spices, to ensure the safety and quality of food products, in particular c

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Latipov, Nusratilla, Dilbar Abduraimova, Zaytuna Ibragimova, Makhsud Otakhonov, and M. Hamdamov. "Numerical simulation of combustion processes." E3S Web of Conferences 401 (2023): 03072. http://dx.doi.org/10.1051/e3sconf/202340103072.

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In this paper, we propose a numerical method for solving the problem of the propagation and combustion of a methane jet in an axisymmetric satellite air flow. Within the framework of the modified turbulence model and the Arrhenius law, mathematical and numerical models of the problem of a turbulent axisymmetric methane jet in an infinite cocurrent air flow at a finite reaction rate have been developed. By introducing functions and generalized Schwab-Zel'dovich functions, as well as the stream function, ten differential equations for the conservation of substances are represented by differentia

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Colognesi, Victor, Renaud Ronsse, and Philippe Chatelain. "Numerical assessment of wake-based estimation of instantaneous lift in flapping flight of large birds." PLOS ONE 18, no. 5 (2023): e0284714. http://dx.doi.org/10.1371/journal.pone.0284714.

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Experimental characterization of bird flight without instrumenting the animal requires measuring the flow behind the bird in a wind tunnel. Models are used to link the measured velocities to the corresponding aerodynamic forces. Widely-used models can, however, prove inconsistent when evaluating the instantaneous lift. Yet, accurately estimating variations of lift is critical in order to reverse-engineer flapping flight. In this work, we revisit mathematical models of lift based on the conservation of momentum in a control volume around a bird. Using a numerical framework to represent a flappi

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Udalov, A. A., M. Yu Uleysky, and M. V. Budyansky. "Analysis of Stationary Points and Bifurcations of a Dynamically Consistent Model of a Two-dimensional Meandering Jet." Nelineinaya Dinamika 18, no. 4 (2022): 0. http://dx.doi.org/10.20537/nd220802.

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A dynamically consistent model of a meandering jet stream with two Rossby waves obtained using the law of conservation of potential vorticity is investigated. Stationary points are found in the phase space of advection equations and the type of their stability is determined analytically. All topologically different flow regimes and their bifurcations are found for the stationary model (taking into account only the first Rossby wave). The results can be used in the study of Lagrangian transport, mixing, and chaotic advection in problems of cross-frontal transport in geophysical flows with meand

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Dobrynin, Ye, and V. Davydov. "SIMULATION MODEL OF THE INFORMATION TECHNOLOGY FOR THE TECHNICAL DIAGNOSIS OF THE IMPULSE HEAT MACHINE." Odes’kyi Politechnichnyi Universytet Pratsi 2, no. 61 (2020): 95–103. http://dx.doi.org/10.15276/opu.2.61.2020.11.

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A simulation model of the information technology for the technical diagnosis of the impulse heat machine has been developed and studied. The model incorporates such mathematical models as barrel energy; ballistic wave parameters; pressure of powder gases blasting from the barrel face behind the shell and the shot blast and determination of its attenuation rate. The information model enables to obtain parameters of the ballistic wave that accompanies an shot. A simplified mathematical model allows of determining the oblique shock inclination angle to the stream speed depending on Mach number wh

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Marcinkowski, Paweł, and Dorota Mirosław-Świątek. "Modelling of climate change impact on flow conditions in the lowland anastomosing river." PeerJ 8 (June 23, 2020): e9275. http://dx.doi.org/10.7717/peerj.9275.

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The progressive degradation of freshwater ecosystems worldwide requires action to be taken for their conservation. Nowadays, protection strategies need to step beyond the traditional approach of managing protected areas as they have to deal with the protection or recovery of natural flow regimes disrupted by the effects of future climate conditions. Climate change affects the hydrosphere at catchment scale altering hydrological processes which in turn impact hydrodynamics at the river reach scale. Therefore, conservation strategies should consider mathematical models, which allow for an improv

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Lutz, Stefanie R., Ype van der Velde, Omniea F. Elsayed, et al. "Pesticide fate on catchment scale: conceptual modelling of stream CSIA data." Hydrology and Earth System Sciences 21, no. 10 (2017): 5243–61. http://dx.doi.org/10.5194/hess-21-5243-2017.

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Abstract. Compound-specific stable isotope analysis (CSIA) has proven beneficial in the characterization of contaminant degradation in groundwater, but it has never been used to assess pesticide transformation on catchment scale. This study presents concentration and carbon CSIA data of the herbicides S-metolachlor and acetochlor from three locations (plot, drain, and catchment outlets) in a 47 ha agricultural catchment (Bas-Rhin, France). Herbicide concentrations at the catchment outlet were highest (62 µg L−1) in response to an intense rainfall event following herbicide application. Increasi

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Lutz, S. R., Y. V. D. Velde, O. F. Elsayed, et al. "Pesticide fate on catchment scale: conceptual modelling of stream CSIA data." Hydrology and Earth System Sciences 21, no. 10 (2017): 5243–61. https://doi.org/10.5194/hess-21-5243-2017.

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Compound-specific stable isotope analysis (CSIA) has proven beneficial in the characterization of contaminant degradation in groundwater, but it has never been used to assess pesticide transformation on catchment scale. This study presents concentration and carbon CSIA data of the herbicides S-metolachlor and acetochlor from three locations (plot, drain, and catchment outlets) in a 47 ha agricultural catchment (Bas-Rhin, France). Herbicide concentrations at the catchment outlet were highest (62 µg L<sup>−1</sup>) in response to an intense rainfall event following herbicide application. Increas

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An, Chenge, Andrew J. Moodie, Hongbo Ma, et al. "Morphodynamic model of the lower Yellow River: flux or entrainment form for sediment mass conservation?" Earth Surface Dynamics 6, no. 4 (2018): 989–1010. http://dx.doi.org/10.5194/esurf-6-989-2018.

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Abstract. Sediment mass conservation is a key factor that constrains river morphodynamic processes. In most models of river morphodynamics, sediment mass conservation is described by the Exner equation, which may take various forms depending on the problem in question. One of the most widely used forms of the Exner equation is the flux-based formulation, in which the conservation of bed material is related to the stream-wise gradient of the sediment transport rate. An alternative form of the Exner equation, however, is the entrainment-based formulation, in which the conservation of bed materia

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Uka, Uchenna, Edwin Esekhaigbe, and Boniface Obi. "Analysis of Boundary Layer Thickness and Temperature Distribution in a Fluidic Stream across a Stretching Sheet with Thermal Nonequilibrium and Viscous Heating Effects." El-Cezeri Fen ve Mühendislik Dergisi 12, no. 2 (2025): 134–52. https://doi.org/10.31202/ecjse.1513483.

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The analysis of boundary layer thickness and temperature distribution effects in a viscous fluid flow of varying Hartmann intensity and thermal nonequilibrium over an exponentially extending/attenuation sheet is discussed in the current work. The fundamental issue involves recovering the ordinary differential models from the leading Navier-Stokes equations of conservation of momentum, energy, and mass which appear in partial differential forms through the similarity estimation approach. The recovered coupled ordinary differential equations (CODEs) have been analytically resolved using the seri

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Soares, Samara, Joel Vasco, and Paulo Scalize. "Water Quality Simulation in the Bois River, Goiás, Central Brazil." Sustainability 15, no. 4 (2023): 3828. http://dx.doi.org/10.3390/su15043828.

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The Cerrado is a hotspot for biodiversity conservation and holds the headwater springs that are major Brazilian river basins. The development of industry, agriculture, and mining causes water quality deterioration. Mathematical models appear as a management tool to simulate water quality parameters and the dispersion of pollutants in water bodies. Thus, this study aimed to evaluate the behavior of dissolved oxygen (DO) and other parameters through the QUAL2Kw (Stream Water Quality Model) model in a river in the Brazilian Cerrado. Complementary data were obtained in four experimental measuremen

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Pereira, Marcelo Divino Ribeiro, and João Batista Pereira Cabral. "Perda de Solo no Alto Curso das Bacias Hidrográficas dos Ribeirões Taquaruçu Grande e Taquaruçuzinho, Palmas (TO)." Revista Brasileira de Geografia Física 14, no. 1 (2021): 332. http://dx.doi.org/10.26848/rbgf.v14.1.p332-339.

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A aplicação de modelos matemáticos na análise da perda de solo em bacias hidrográficas ganhou atenção, nos anos de 1960 e 1970, a partir da análise integrada da paisagem. Nesse contexto, a Equação Universal de Perda de Solo (EUPS) se destaca como um dos modelos mais utilizados mundialmente no conhecimento dos processos erosivos e no planejamento ambiental. Diante disso, este estudo tem por objetivo estimar as perdas de solos nas bacias hidrográficas dos córregos Macacão e Mutum, localizadas no município de Palmas (TO). Os resultados demonstram que as áreas estudadas sofreram com um alto poder

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Vasarevičius, Saulius, Asta Mineikaitė, and Petras Vaitiekūnas. "INVESTIGATION INTO HEAVY METALS IN STORM WASTEWATER FROM VILNIUS ŽIRMŪNAI DISTRICT AND POLLUTANTITS SPREAD MODEL IN NERIS RIVER." JOURNAL OF ENVIRONMENTAL ENGINEERING AND LANDSCAPE MANAGEMENT 18, no. 3 (2010): 242–49. http://dx.doi.org/10.3846/jeelm.2010.28.

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The paper discusses investigation into uncleaned storm wastewater pollution with heavy metals in Vilnius Žirmūnai district. The goal is to determine the dependency of storm wastewater pollution with heavy metals on transport intensity. After determining this dependency, sweeps from street points is experimentally studied with the most intensive transport flows. As the street sweeps together with storm wastewater are both outflow from streets and through outflow pipes directly to the Neris, heavy metals in the outflow pipe sludge are also studied for each pool. The following heavy metals have b

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Жолобов, Владимир Васильевич, Валерий Юрьевич Морецкий, and Рустям Фаатович Талипов. "Distribution of volume of water accumulations in profile oil pipeline." SCIENCE & TECHNOLOGIES OIL AND OIL PRODUCTS PIPELINE TRANSPORTATION, no. 5 (October 31, 2022): 438–51. http://dx.doi.org/10.28999/2541-9595-2022-12-5-438-451.

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Введение. Имеющиеся математические модели поведения воды в эксплуатируемых нефтепроводах не учитывают возможность одновременного существования неподвижной и подвижной форм водных образований. Это ограничивает область применимости таких расчетных моделей и делает актуальной разработку обобщенных гидравлических моделей. Методы. Применение положений многоскоростного континуума позволяет сформулировать общую математическую модель многофазной среды, которая при адаптации допускает высокую степень детализации гидравлического описания накопления и миграции воды. При этом будут сформулированы незамкну

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Arya, Manju, Deepak a, and J. S. Rawat. "STUDY OF DRAINAGE SYSTEM AND ITS HYDROLOGICAL IMPLICATIONS USING GEO-SPATIAL TECHNIQUES: A MORPHOMETRIC ANALYSIS IN MUTHUGAD WATERSHED OF GRAHWAL HIMALYA, UTTARAKHAND." International Journal of Advanced Research 11, no. 05 (2023): 1563–73. http://dx.doi.org/10.21474/ijar01/17024.

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Measurements of the shape or geometry of any natural form, including those of plants, animals, and relief features, are referred to as morphometry. Morphometry is the accurate measurement of landforms. One of the crucial requirements for effective management and planning of water resources within the watershed is an understanding of the behavior of the surface drainage network. In order to comprehend and interpret the dynamics of the watersheds drainage system and to understand the drainage network features, morphometric study of a watershed is a vital stage in watershed development and manage

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Ombaki, Richard, and Joash Kerongo. "Formulated Mathematical Model for Delayed Particle Flow in Cascaded Subsurface Water Reservoirs with Validation on River Flow." Journal of Applied Mathematics 2022 (November 10, 2022): 1–11. http://dx.doi.org/10.1155/2022/3438200.

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Migration of pollutant particles into subsurface water reservoirs through point sources is largely involved mixing processes within the system of water flow. Possible potential sources of pollution to these point sources include municipal wastes, septic loads, landfills, uncontrolled hazardous wastes, and sewage storage tanks. The mixing processes of pollutant significantly alter their predictive rate of flow in the water reservoirs, and therefore the time inherent in mixing processes need to be accounted for. In this study, pollution of subsurface water reservoirs mainly rivers and streams th

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Akulinichev, P. D., M. A. Albov, and A. A. Goncharov. "MODERN MATHEMATICAL MODELS OF PROCESSING WITH A FREE ABRASIVE." Spravochnik. Inzhenernyi zhurnal, no. 317 (August 2023): 11–16. http://dx.doi.org/10.14489/hb.2023.08.pp.011-016.

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The paper presents the results of the analysis of modern mathematical models for processing with a free abrasive. The features of mathematical models for some methods of processing with a free abrasive are revealed. The requirements for a mathematical model for processing with a free abrasive by the stream finishing method are presented.

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Ryabova, G. O. "The Geminid meteor shower radiant: a mathematical model." Monthly Notices of the Royal Astronomical Society 507, no. 3 (2021): 4481–86. http://dx.doi.org/10.1093/mnras/stab2286.

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ABSTRACT The origin of the Geminid meteoroid stream and its parent body the asteroid (3200) Phaethon is still under discussion. The observed bimodal activity profile of the Geminid shower agrees with a cometary scheme of the stream formation. We show that the radiant areas for meteors of different magnitudes may also be used to provide arguments supporting or undermining the cometary hypothesis. We used semi-analytic and numerical models of the stream. The resulting model radiants for meteors of various magnitudes (masses) have peculiar patterns that might be detected in a real shower.

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Linets, G. I., R. Al Voronkin, and S. Vl Govorova. "Evaluation of the efficiency of reference machine learning models for buffer memory prediction when transforming a self-similar input stream of packets into a stream having exponential distribution under the condition of equality of mathematical expectations and median flows." Sovremennaya nauka i innovatsii, no. 3 (39) (2022): 20–32. http://dx.doi.org/10.37493/2307-910x.2022.3.2.

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Using machine learning methods, models have been developed to predict the size of the queue depending on the Hurst exponent based on the data obtained when performing the transformation of an input self-similar stream distributed according to the Pareto law into a stream having an exponential distribution with equal mathematical expectation and equal medians. A comparative analysis of the obtained models is carried out. Each model was examined using the following quality metrics: coefficient of determination, rms regression error, mean absolute error, penalty value, estimated loss. Models that

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Myamlin, V. V. "THE SCHEME OF PIECE-WISE LINEAR UNIT AS A MATHEMATICAL MODEL OF PROCESS MODULES OF FLEXIBLE ASYNCHRONOUS THREAD OF REPAIR CARS." Science and Transport Progress, no. 25 (December 25, 2008): 18–22. http://dx.doi.org/10.15802/stp2008/14331.

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A variant of configuration of an enterprise using the asynchronous flexible stream of repair of wagons is suggested. A method of formalization of a process of functioning the technologic modules of asynchronous flexible stream of repair of wagons is considered. A general scheme of segment-linear aggregate as a mathematical scheme of functioning the technologic modules is proposed. The given mathematical scheme can be further a basis for development of various imitation models used in design and study of the asynchronous flexible stream of repair of wagons.

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23

Larchenko, L. V., A. V. Parkhomenko, B. D. Larchenko, and V. R. Korniienko. "DESIGN MODELS OF BIT-STREAM ONLINE-COMPUTERS FOR SENSOR COMPONENTS." Radio Electronics, Computer Science, Control, no. 1 (April 2, 2024): 62. http://dx.doi.org/10.15588/1607-3274-2024-1-6.

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Context. Currently, distributed real-time control systems need the creation of devices that perform online computing operations close to the sensor. The proposed online-computers of elementary mathematical functions can be used as components for the functional conversion of signals in the form of pulse streams received from measuring sensors with frequency output. Objective. The objective of the study is the development of mathematical, architectural and automata models for the design of bit-stream online-computers of elementary mathematical functions in order to create a unified approac

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Boyraz, Uğur, and Cevza Melek Kazezyılmaz-Alhan. "Solutions for groundwater flow with sloping stream boundary: analytical, numerical and experimental models." Hydrology Research 49, no. 4 (2017): 1120–30. http://dx.doi.org/10.2166/nh.2017.264.

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Abstract Protecting groundwater resources plays an important role in watershed management. For this purpose, studies on groundwater flow dynamics incorporating surface water–groundwater interactions have been conducted including analytical, numerical, and experimental models. In this research, a stream–aquifer system was considered to understand the physical behavior of surface water–groundwater interactions. Interactions in a stream–aquifer system were incorporated into the mathematical modeling by defining the stream head as a boundary condition for the groundwater flow equation. This bounda

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Sloat, Matthew R., and Ann-Marie K. Osterback. "Maximum stream temperature and the occurrence, abundance, and behavior of steelhead trout (Oncorhynchus mykiss) in a southern California stream." Canadian Journal of Fisheries and Aquatic Sciences 70, no. 1 (2013): 64–73. http://dx.doi.org/10.1139/cjfas-2012-0228.

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To determine individual and population responses of steelhead trout (Oncorhynchus mykiss) to stream temperature, we sampled summer stream temperature and juvenile steelhead occurrence, abundance, and behavior in a small stream near the species' southern limit. Maximum annual stream temperature (22.3–33.1 °C) exerted a strong threshold effect on steelhead occurrence. Steelhead persisted through summer in all pools that did not exceed 30 °C, but the probability of persistence rapidly decreased to zero at warmer sites. Below the threshold for fish persistence, thermal effects on steelhead abundan

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Guedes, Nayme Soares, Camila de Sousa Queiroz Almeida, Caio Herman Teixeira de Oliveira, et al. "Soil and Water Loss Estimation Mathematical Models: A Review." International Journal of Geoscience, Engineering and Technology 11, no. 1 (2024): 1–10. https://doi.org/10.70597/ijget.v11i1.554.

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The erosion process is natural but has intensified in recent years due to anthropogenic activities, becoming a socio-environmental issue resulting from soil degradation. This process impacts various areas, and its measurement is a critical tool for adopting management strategies and conservation practices. Mathematical models can estimate soil losses under different environmental conditions. When integrated with GIS environments, these models significantly reduce execution and study costs, while generating valuable information, creating maps, and characterizing the environment. This study aime

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Adam, C., J. Sánchez-Guillén, and A. Wereszczyński. "Conservation laws in Skyrme-type models." Journal of Mathematical Physics 48, no. 3 (2007): 032302. http://dx.doi.org/10.1063/1.2710652.

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Dash, S. K., and S. K. Som. "Ignition and Combustion of Liquid Fuel Droplet in a Convective Medium." Journal of Energy Resources Technology 113, no. 3 (1991): 165–70. http://dx.doi.org/10.1115/1.2905799.

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A mathematical model of droplet combustion in surroundings of hot gas with a uniform free stream motion is made from the numerical solution of the conservation equations of heat, mass and momentum in both the carrier and droplet phases. The gas phase chemical reaction between fuel vapor and oxidizer is assumed to be a single-step irreversible one. The phenomena of ignition is recognized by the sudden rise of temperature in the temperature-time histories at different locations in the carrier phase. The relative influences of pertinent input parameters, namely initial Reynolds number Rei, ratio

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Braun, Douglas C., and John D. Reynolds. "Relationships between habitat characteristics and breeding population densities in sockeye salmon (Oncorhynchus nerka)." Canadian Journal of Fisheries and Aquatic Sciences 68, no. 5 (2011): 758–67. http://dx.doi.org/10.1139/f2011-015.

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We examine the importance of stream habitat characteristics in governing variation in spawning densities of sockeye salmon ( Oncorhynchus nerka ) across 32 streams in the Fraser River Basin, British Columbia, Canada. We used mixed-effects models to examine four competing hypotheses for the influence of abiotic stream characteristics acting on either adult salmon or embryo mortality. All models that received support using Akaike’s information criterion included stream characteristics that are associated with cover. These included the percent area of pools, percentage of the banks that were unde

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Rao, Bhaskara, K. V. Rao, G. V. Srinivasa Reddy, M. Nemichandrappa, B. S. Polisgowdar, and M. Udaya Bhanu. "Comparison of performance of SWAT and SIMHYD models in simulation of stream flow from Hidkal dam catchment area of India under present and future scenarios." Ecology, Environment and Conservation 29 (2023): 404–14. http://dx.doi.org/10.53550/eec.2023.v29i03s.070.

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A study was conducted to compare the performance of SWAT and SIMHYD models in prediction of stream flow from the catchment of Hidkal dam of Karnataka in India for present and future scenarios. SWAT and SIMHYD models were used for the present study and calibrated with SWAT-CUP and generic algorithm respectively. The performance of models were tested with Nash Sutcliffe Efficiency (NSE), RMSE observations standard deviation ratio (RSR), Coefficient of Determination (R2) and Per cent Bias (PBIAS). The SWAT model performed well and very good agreement between monthly observed and simulated stream

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van Odyck, Daniel E. A., John B. Bell, Franck Monmont, and Nikolaos Nikiforakis. "The mathematical structure of multiphase thermal models of flow in porous media." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 465, no. 2102 (2008): 523–49. http://dx.doi.org/10.1098/rspa.2008.0268.

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This paper is concerned with the formulation and numerical solution of equations for modelling multicomponent, two-phase, thermal fluid flow in porous media. The fluid model consists of individual chemical component (species) conservation equations, Darcy's law for volumetric flow rates and an energy equation in terms of enthalpy. The model is closed with an equation of state and phase equilibrium conditions that determine the distribution of the chemical components into phases. It is shown that, in the absence of diffusive forces, the flow equations can be split into a system of hyperbolic co

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May, Robert M. "Food-web assembly and collapse: mathematical models and implications for conservation." Philosophical Transactions of the Royal Society B: Biological Sciences 364, no. 1524 (2009): 1643–46. http://dx.doi.org/10.1098/rstb.2008.0280.

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Peng, Liangrong, and Liu Hong. "Recent Advances in Conservation–Dissipation Formalism for Irreversible Processes." Entropy 23, no. 11 (2021): 1447. http://dx.doi.org/10.3390/e23111447.

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The main purpose of this review is to summarize the recent advances of the Conservation–Dissipation Formalism (CDF), a new way for constructing both thermodynamically compatible and mathematically stable and well-posed models for irreversible processes. The contents include but are not restricted to the CDF’s physical motivations, mathematical foundations, formulations of several classical models in mathematical physics from master equations and Fokker–Planck equations to Boltzmann equations and quasi-linear Maxwell equations, as well as novel applications in the fields of non-Fourier heat con

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Dong, Z., and Xi Chen Yang. "Theoretical Simulation of Temperature Field of Coaxial Powder Stream in Laser Cladding." Key Engineering Materials 392-394 (October 2008): 245–49. http://dx.doi.org/10.4028/www.scientific.net/kem.392-394.245.

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Theoretical models of temperature field are presented from Beer-Lambert law. This paper uses Beer-Lambert law to calculate powder flow on the absorption of energy and applies the law of the conservation of the energy to calculate the temperature of powder stream. This paper analyzes the effect of the various factors on the temperature field of powder flow. Temperature field of powder stream is measured by CCD camera. Finally the comparison of the theoretical results and the experimental results indicates the accuracy of the theoretical calculation.

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Widodo, Basuki, Eirene Juwita Ningtyas Pamela, Dieky Adzkiya, Chairul Imron, and Tri Rahayuningsih. "MAGNETOHYDRODYNAMICS NANOFERRO FLUID FLOWS PASSING THROUGH A MAGNETIC POROUS SPHERE UNDER THERMAL RADIATION EFFECT." BAREKENG: Jurnal Ilmu Matematika dan Terapan 16, no. 4 (2022): 1303–12. http://dx.doi.org/10.30598/barekengvol16iss4pp1303-1312.

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In the application of thermonuclear reactor cooling, temperature regulation relies on experiments based on practical experience. Therefore, the accuracy of this temperature setting is operator-dependent. So it is necessary to develop a mathematical model to solve these problems. The dimensional mathematical model therefore is generated using the conservation laws of mass, momentum, and energy. The dimensional mathematical model is further transformed into non-dimensional mathematical model by using non-dimensional variables. The non-dimensional mathematical model is simplified using the simila

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Zhu, Ping. "Application of Thermodynamics to the Allocation of Cumulative Exergy Consumption in the Multiproduct Separation Processes." Advanced Materials Research 236-238 (May 2011): 741–45. http://dx.doi.org/10.4028/www.scientific.net/amr.236-238.741.

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Based on the minimum separation work theory, a novel allocation parameter of cumulative exergy consumption, the minimum separation power of the product stream (MSPS), is proposed in the separation processes in this article. The related mathematical models are established. The application of this approach to a case study is provided.

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Falke, Jeffrey A., Kurt D. Fausch, Kevin R. Bestgen, and Larissa L. Bailey. "Spawning phenology and habitat use in a Great Plains, USA, stream fish assemblage: an occupancy estimation approach." Canadian Journal of Fisheries and Aquatic Sciences 67, no. 12 (2010): 1942–56. http://dx.doi.org/10.1139/f10-109.

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Knowledge of basic life-history attributes, paired with unbiased estimates of species distribution, is critical for the effective conservation of sensitive fish species. We quantified the spawning phenology, habitat use, and detectability for larvae of an assemblage of threatened Great Plains, USA, stream fishes using new occupancy estimation methods. Spawning by six Great Plains fish species occurred from April through July, and was likely initiated by changes in water temperature and photoperiod. Habitat size and type were important factors influencing the occupancy of larvae in spawning hab

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Ziemińska-Stolarska, Aleksandra, and Jerzy Skrzypski. "Review of Mathematical Models of Water Quality." Ecological Chemistry and Engineering S 19, no. 2 (2012): 197–211. http://dx.doi.org/10.2478/v10216-011-0015-x.

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Review of Mathematical Models of Water Quality Water is one of the main elements of the environment which determine the existence of life on the Earth, affect the climate and limit the development of civilization. Water resources management requires constant monitoring in terms of its qualitative-quantitative values. Proper assessment of the degree of water pollution is the basis for conservation and rational utilization of water resources. Water quality in lakes and dams is undergoing continuous degradation caused by natural processes resulting from eutrophication and due to anthropogenic rea

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Francis Agbo Idoko, Josephine Biya Aladetan, and Otugene Victor Bamigwojo. "Mathematical models for sustainable fisheries management in U.S. waters: Balancing economic growth and conservation." Magna Scientia Advanced Biology and Pharmacy 13, no. 1 (2024): 127–52. http://dx.doi.org/10.30574/msabp.2024.13.1.0061.

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Sustainable fisheries management is critical for balancing the dual objectives of economic growth and environmental conservation, particularly in U.S. waters where overfishing, habitat degradation, and fluctuating marine ecosystems pose significant challenges. This review explores the role of mathematical models in addressing these challenges and guiding fisheries management decisions. Various models, including population dynamics, bioeconomic, and ecosystem-based approaches, are examined for their utility in setting sustainable catch limits, assessing stock health, and predicting ecosystem ch

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Ojimadu, U. H., A. O. Oluwole, A. O. Olasupo, et al. "MATHEMATICAL ANALYSIS OF ELECTROPHYSIOLOGICAL CARDIAC TISSUE MEMBRANE MODELS." FUDMA JOURNAL OF SCIENCES 6, no. 2 (2022): 138–43. http://dx.doi.org/10.33003/fjs-2022-0602-931.

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This paper presents some cardiac electrophysiological models. Proper mathematical analysis was done on the proposed models. In the cause of the analysis, several assumptions were made which helped in providing a parallel platform for making qualitative solutions so as to reduce any form of bias. Graphical analysis was adopted in solving the cardiac electrophysiological models using conservation and dispersions equations. The results obtained were derived from computer simulation by observing ring lengths on a valid restitution curve. The restitution curves helps us to subject three different t

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Răsvan, Vladimir. "Control of Conservation Laws – An Application." Tatra Mountains Mathematical Publications 71, no. 1 (2018): 155–74. http://dx.doi.org/10.2478/tmmp-2018-0014.

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Abstract We present here three types of controlled boundary value problems for conservation laws arising from energy co-generation, hydraulic flows and water hammer for hydroelectric power plants and control of the open channel flows (shallow water). The novelty of these models, from the mathematical point of view, is that they are described by nonlinear hyperbolic partial differential equations of the conservation laws with (possibly) nonlinear boundary conditions. At their turn these boundary conditions are controlled by some systems of ordinary differential equations. The engineering requir

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Shields, F. Douglas, Eddy J. Langendoen, and Martin W. Doyle. "ADAPTING EXISTING MODELS TO EXAMINE EFFECTS OF AGRICULTURAL CONSERVATION PROGRAMS ON STREAM HABITAT QUALITY." Journal of the American Water Resources Association 42, no. 1 (2006): 25–33. http://dx.doi.org/10.1111/j.1752-1688.2006.tb03820.x.

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Orazbayev, B., I. Issa, N. Dzumamukhambetov, B. E. Utenova, A. Seidaliyev, and G. Shuitenov. "Construction of geological and mathematical models for modeling the oil pool of the Kenkiyak deposit." Bulletin of the National Engineering Academy of the Republic of Kazakhstan 84, no. 2 (2022): 195–205. http://dx.doi.org/10.47533/2020.1606-146x.143.

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Geological and mathematical models of the oil reservoir of the post-salt Kenkiyak field have been investigated and built. 6 types of geological models have been proposed, and on the basis of these models, mathematical models of oil deposits have been developed. Geological models are built on the basis of research results, taking into account the requirements of regulating the development of the Kenkiyak field, the geological characteristics of the field and the rate of operation. The mathematical model is based on the basic Darcy equations and includes equations for conservation of mass and en

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Mohammed, F. A. "Soliton solutions for some nonlinear models in mathematical physics via conservation laws." AIMS Mathematics 7, no. 8 (2022): 15075–93. http://dx.doi.org/10.3934/math.2022826.

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<abstract><p>In this paper, we derive the soliton solutions from conserved quantities for the Benjamin-Bona-Mahoney equation with dual-power law nonlinearity (BBM), modified regularized long wave (MRLW) equation, modified nonlinearly dispersive KdV equations 2K(2, 2, 1) and 3K(3, 2, 2) equation, which are constructed by the multiplier approach (variational derivative method). Finally, we give the numerical simulations to illustrate this method.</p></abstract>

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Pius, Oko Daniel Jacob Simon Okweche Imaobong Jacob. "Mathematical modeling of Gorilla Gorilla Delhi population in cross river state, Nigeria." Scientific Reports in Life Sciences 5, no. 4 (2024): 41–53. https://doi.org/10.5281/zenodo.14198599.

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This study investigates various mathematical models to ascertain their suitability for predicting gorilla population dynamics over three decades in Cross River State, Nigeria. Models including linear, quadratic, exponential, logarithmic, power law, logistic growth, polynomial, sinusoidal, and piecewise linear were evaluated based on their R<sup>2</sup> (coefficient of determination) and SSE (sum of squared errors) metrics. The analysis, conducted using historical gorilla population data from 1990 to 2020, aimed to identify the model that best captures the observed growth patterns and fluctuati

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Karzilov, A. I., F. F. Tetenev, T. N. Bodrova, and P. Ye Mes’ko. "Prediction of bronchial permeability disturbance from breathing patterns." Bulletin of Siberian Medicine 6, no. 4 (2007): 22–30. http://dx.doi.org/10.20538/1682-0363-2007-4-22-30.

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Health subjects (n = 15), patients with bronchial asthma (n = 30), COPD (n = 16), and community-acquired pneumonia (n = 17) have been inspected in the mixed group (40 men, 38 women, 15-64 years old). The results of research of breathing patterns with interruption of air stream have been used to construct Raw, FEV1, FEV1% and FEV1/FVC% mathematical models. High diagnostic importance of FEV1% and FEV1/FVC% models in prediction of bronchial permeability disturbance has been shown.

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Kushimov, B. A., K. A. Karimov, A. X. Akhmedov, and Kh Zh Mamadaliev. "Theoretical preconditions for the development of mathematical models of the technology of desert plant drying." E3S Web of Conferences 462 (2023): 02021. http://dx.doi.org/10.1051/e3sconf/202346202021.

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The formulation of stationary and non-stationary problems for drying dispersed materials is substantiated in the article. A mathematical model and its analytical solutions are developed to determine the patterns of the interdependence of temperature and moisture content. A mathematical model of the process of drying a dispersed material is based on the energy conservation law under heat and mass transfer in a multiphase medium.

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Rak, Tomasz, and Dariusz Rzonca. "Recommendations for Using QPN Formalism for Preparation of Incoming Request Stream Generator in Modeled System." Applied Sciences 11, no. 23 (2021): 11532. http://dx.doi.org/10.3390/app112311532.

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Simulation models are elements of science that use software tools to solve complex mathematical problems. They are beneficial in areas such as performance engineering and communications systems. Nevertheless, to achieve more accurate results, researchers should use more detailed models. Having an analysis of the system operations in the early modeling phases could help one make better decisions relating to the solution. In this paper, we introduce the use of the QPME tool, based on queueing Petri nets, to model the system stream generator. This formalism was not considered during the first too

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Adhikari, Athma Ram. "Traffic flow models." Journal of Tikapur Multiple Campus 4, no. 4 (2018): 68–74. http://dx.doi.org/10.3126/jotmc.v4i4.70252.

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Traffic flow is the study of the movement of individual drivers and vehicles between two points and the interactions they make with one another.Traffic flow models can be used to simulate traffic, for instance to evaluate ex-ante the use of a new part of the infrastructure. Models can be categorized based on, firstly, representation of the traffic flow in terms of flows (macroscopic), groups of drivers (macroscopic) or individual drivers (microscopic) and, secondly, underlying behavioral theory, which can be based on characteristics of the flow (macroscopic) or individual drivers (microscopic

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Wall, Steven S., Charles R. Berry, Jr., Carmen M. Blausey, Jonathan A. Jenks, and Chad J. Kopplin. "Fish-habitat modeling for gap analysis to conserve the endangered Topeka shiner (Notropis topeka)." Canadian Journal of Fisheries and Aquatic Sciences 61, no. 6 (2004): 954–73. http://dx.doi.org/10.1139/f04-017.

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Decision support tools that predict fish distribution over broad spatial scales are needed to assist in planning watershed management and endangered species recovery. We developed a geographical information system model with multivariate logistic regression to rank valley segments for probable occurrence of the endangered Topeka shiner (Notropis topeka) using stream condition variables (stream size, groundwater potential, channel slope, streamflow, network position) and land-cover variables (percent pasture, percent trees) in streams characteristic of the North American Great Plains. The strea

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