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Journal articles on the topic 'Modeling the formation density'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

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1

Hulle, Marc M. Van. "Kernel-Based Topographic Map Formation by Local Density Modeling." Neural Computation 14, no. 7 (2002): 1561–73. http://dx.doi.org/10.1162/08997660260028610.

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We introduce a new learning algorithm for kernel-based topographic map formation. The algorithm generates a gaussian mixture density model by individually adapting the gaussian kernels' centers and radii to the assumed gaussian local input densities.

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Im, Yeon Ho, Max O. Bloomfield, Suchira Sen, and Timothy S. Cale. "Modeling Pattern Density Dependent Bump Formation in Copper Electrochemical Deposition." Electrochemical and Solid-State Letters 6, no. 3 (2003): C42. http://dx.doi.org/10.1149/1.1541256.

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3

Korovin, Mikhail O., and Anna O. Aleeva. "“Core–core” petrophysical relationships generation for reservoir modeling." Bulletin of the Tomsk Polytechnic University Geo Assets Engineering 335, no. 4 (2024): 73–79. http://dx.doi.org/10.18799/24131830/2024/4/4539.

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Relevance. The need in a detailed analysis of distribution of physical properties of the formation in space. Currently, the parameters connecting the results of responses of geophysical fields and petrophysical studies of core are averaged. On the one hand, this is due to the small number of wells with cores in the fields, and on the other hand, to simplify and speed up calculations in the presence of a large number of wells with geophysical surveys of wells. However, this approach does not allow us to identify the largest number of a particular layer or section characteristics. This, in its t

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4

Luycx, Mathilde, and Carlos Torres-Verdín. "Rapid forward modeling of logging-while-drilling neutron-gamma density measurements." GEOPHYSICS 83, no. 6 (2018): D231—D246. http://dx.doi.org/10.1190/geo2018-0142.1.

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Neutron-activated gamma-ray (neutron-gamma) logging-while-drilling (LWD) measurements deliver bulk density estimates without using a chemical source. The assessment of bulk density is based on neutron-induced non-capture gamma rays, corrected for neutron transport by combining particle counts acquired at two gamma-ray detectors and two fast neutron detectors. Particle counts from all four detectors are necessary to deliver one density measurement whose accuracy compares well to that of the gamma-gamma density instruments. Thereafter, borehole environmental effects are mitigated with empirical

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5

Finke, Justin D., Marco Ajello, Alberto Domínguez, et al. "Modeling the Extragalactic Background Light and the Cosmic Star Formation History." Astrophysical Journal 941, no. 1 (2022): 33. http://dx.doi.org/10.3847/1538-4357/ac9843.

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Abstract We present an updated model for the extragalactic background light (EBL) from stars and dust, over wavelengths ≈0.1–1000 μm. This model uses accurate theoretical stellar spectra, and tracks the evolution of star formation, stellar mass density, metallicity, and interstellar dust extinction and emission in the universe with redshift. Dust emission components are treated self-consistently, with stellar light absorbed by dust reradiated in the infrared as three blackbody components. We fit our model, with free parameters associated with star formation rate and dust extinction and emissio

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Ryzhova, D. A., A. I. Tolstova, E. P. Dubinin, M. V. Kosnyreva, A. A. A.A. Bulychev, and A. L. Groholsky. "TECTONOSPHERE AND FORMATION OF THE MOZAMBIQUE RIDGE: DENSITY AND PHYSICAL MODELING." BULLETIN OF KAMCHATKA REGIONAL ASSOCIATION «EDUCATIONAL-SCIENTIFIC CENTER». EARTH SCIENCES 1, no. 53 (2022): 46–58. http://dx.doi.org/10.31431/1816-5524-2022-1-53-46-58.

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The tectonosphere and formation conditions of the Mozambique Ridge are considered. The Mozambique Ridge is located in the southwestern part of the Indian Ocean between the Natal and the Mozambique Mesozoic Basins. The way how the ridge formed remains debatable. The anomalous structure of the crust of the Mozambique Ridge can be explained either by underplaying - thickening of the oceanic crust from below due to magmatism, or by stretching and thinning of the continental crust. Based on gravitational and magnetic field anomalies, seismotomography and other geological and geophysical information

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Damayanti, Cahya, Sismanto Sismanto, Ari Setiawan, and Lina Handayani. "Application Power Spectrum Analysis of Gravity Data to Investigate Subsurface Structures of the North Banggai-Sula Microcontinent in Maluku Sea Area." Iraqi Geological Journal 57, no. 1E (2024): 252–65. http://dx.doi.org/10.46717/igj.57.1e.16ms-2024-5-27.

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Different tectonic characteristics are exhibited among Maluku Sea and Banggai-Sula Microcontinent which are located side by side to each other. However, the northern part of the Banggai-Sula Microcontinent, positioned along the Maluku Sea margin, has a complex geological structure to be observed. Therefore, this study aimed to analyze the subsurface structure and sediment thickness due to extensional mechanisms in the area, using the gravity method. The investigation was executed through power spectrum analysis and three-dimensional (3D) modeling of complete Bouguer anomaly data. Eleven x-dire

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8

Gerasimenko, Alexander Yu, Artem V. Kuksin, Yury P. Shaman, et al. "Hybrid Carbon Nanotubes–Graphene Nanostructures: Modeling, Formation, Characterization." Nanomaterials 12, no. 16 (2022): 2812. http://dx.doi.org/10.3390/nano12162812.

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A technology for the formation and bonding with a substrate of hybrid carbon nanostructures from single-walled carbon nanotubes (SWCNT) and reduced graphene oxide (rGO) by laser radiation is proposed. Molecular dynamics modeling by the real-time time-dependent density functional tight-binding (TD-DFTB) method made it possible to reveal the mechanism of field emission centers formation in carbon nanostructures layers. Laser radiation stimulates the formation of graphene-nanotube covalent contacts and also induces a dipole moment of hybrid nanostructures, which ensures their orientation along th

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9

QIN, L., K. HAGEL, R. WADA, et al. "LOW DENSITY NUCLEAR MATTER IN FERMI ENERGY COLLISIONS." International Journal of Modern Physics E 19, no. 08n09 (2010): 1513–22. http://dx.doi.org/10.1142/s0218301310015916.

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Recent heavy ion reaction studies aimed at elucidating the properties of low density matter produced in near Fermi-energies are discussed. At the lowest densities and temperatures large alpha mass fractions are observed. The symmetry free energies derived from isoscaling analyses are far above those obtained in common effective interaction calculations, reflecting cluster formation, primarily of alpha particles, not included in such calculations. Theoretical modeling of these results requires the consideration of cluster formation and medium modifications of cluster properties.

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10

Zhang, Yichen, Jonathan Tan, Chris McKee, and James De Buizer. "Massive Star Formation: Radiation Transfer Modeling and Multiwavelength Observation." Proceedings of the International Astronomical Union 8, S292 (2012): 67. http://dx.doi.org/10.1017/s1743921313000471.

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AbstractWe present a radiation transfer model consistently developed for a core in high pressure environment forming a massive star through core accretion. We compare this model to the massive protostar G35.2-0.74N, including SOFIA observations at 30 and 40μm. Good agreement is achieved, showing that a ~30M⊙ protostar is forming from a high surface density core via relatively ordered collapse and accretion, driving powerful outflows. This result supports the Core Accretion theory which predicts that massive stars form similarly to low-mass stars.

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Wang, Le, Amin Haghmoradi, Jinlu Liu, et al. "Modeling micelle formation and interfacial properties with iSAFT classical density functional theory." Journal of Chemical Physics 146, no. 12 (2017): 124705. http://dx.doi.org/10.1063/1.4978503.

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12

Ryzhova, D. A., A. I. Tolstova, E. P. Dubinin, M. V. Kosnyreva, A. A. Bulychev, and A. L. Groholsky. "The Tectonosphere and Formation of the Mozambique Ridge: Density and Physical Modeling." Russian Journal of Pacific Geology 17, S2 (2023): S178—S189. http://dx.doi.org/10.1134/s1819714023080195.

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13

Urban, Andrea, and Neal J. Evans. "Modeling the dust and gas temperatures near young stars." Proceedings of the International Astronomical Union 2, S237 (2006): 481. http://dx.doi.org/10.1017/s1743921307002694.

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AbstractAs young stars form, they interact with their environment in many ways. We study the radiative interaction of a young star with its surrounding cluster environment. The change in gas temperature caused by a forming star can trigger the formation or inhibit the growth of nearby star forming cores. We calculate the gas temperature around a single star by balancing the dust-gas collisional heating, molecular cooling, and cosmic ray heating rates for a grid of models with various luminosities and density distributions. In the future, this work can be used in large-scale simulations of clus

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Shostak, Nikita, and Evgeny Zaporozhets. "Mathematical modeling of the liquefied gases hydrates formation." Journal of Physics: Conference Series 2373, no. 3 (2022): 032004. http://dx.doi.org/10.1088/1742-6596/2373/3/032004.

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Abstract A model of the formation of hydrates in the system of phase states of liquefied gas - water (ice, liquid, vapor), which is in a stratified state or in the form of emulsions, is presented. The relationship between the amount of liquefied gas components transferred into clusters and remaining in the environment is described. The features of the kinetics of the hydrate formation process are reflected. Using the developed mathematical model of the formation of hydrates of single- and multicomponent liquefied gases, it is possible, in a first approximation, to determine the thermobaric par

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15

Dolgova, K., E. Vekshina, and V. Rozhansky. "Modeling of high-field-side high-density regime in the Globus-M2 tokamak." Plasma Physics and Controlled Fusion 66, no. 3 (2024): 035001. http://dx.doi.org/10.1088/1361-6587/ad1b89.

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Abstract Formation of a high-field-side high-density (HFSHD) regime and the role of the high-field-side (HFS) poloidal electric field in the scrape-off layer of the spherical tokamak Globus-M2 are analyzed using SOLPS-ITER edge plasma simulations. The dependence of the HFS poloidal electric field sign and, consequently, radial drift fluxes on the discharge density is discussed. It is demonstrated that the HFS poloidal electric field is the key element in the formation of a HFSHD regime in the Globus-M2 tokamak as in ASDEX Upgrade. It is demonstrated that the physics of HFSHD formation in a sma

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16

Polzin, Ava, Andrey V. Kravtsov, Vadim A. Semenov, and Nickolay Y. Gnedin. "Modeling Molecular Hydrogen in Low-metallicity Galaxies." Astrophysical Journal 966, no. 2 (2024): 172. http://dx.doi.org/10.3847/1538-4357/ad32cb.

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Abstract We use a suite of hydrodynamics simulations of the interstellar medium (ISM) within a galactic disk, which includes radiative transfer, a nonequilibrium model of molecular hydrogen, and a realistic model for star formation and feedback, to study the structure of the ISM and H2 abundance as a function of local ISM properties. We show that the star formation rate and structure of the ISM are sensitive to the metallicity of the gas with a progressively smoother density distribution with decreasing metallicity. In addition to the well-known trend of the H I–H 2 transition shifting to high

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17

Nugraha, Gumilar Utamas, Lina Handayani, Rachmat Fajar Lubis, Dadan Dani Wardhana, and Karit Lumban Gaol. "Basement Characteristics of Jakarta Groundwater Basin Based on Satellite Gravimetry Data." Indonesian Journal of Geography 52, no. 1 (2020): 42. http://dx.doi.org/10.22146/ijg.46672.

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Jakarta groundwater basin is one of the most developed basins in Indonesia as Jakarta city is located within the basin, with an elevation ranging from 0 to 1000 m above sea level. The study of the basement characteristics of groundwater basins still needs further study in the Jakarta Groundwater Basin. The objective of this study is to examine the basement characteristics of Jakarta Groundwater Basin by satellite gravimetry. Gravity forward models were constructed using Oasis Montaj and 2-D GM-SYS software for two north-south sections, A and B, and west-east section C-D. Regional anomalies in

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18

Burbelko, A. A., D. Gurgul, M. Królikowski, and M. Wróbel. "Cellular Automaton Modeling of Ductile Iron Density Changes at the Solidification Time." Archives of Foundry Engineering 13, no. 4 (2013): 9–14. http://dx.doi.org/10.2478/afe-2013-0074.

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Abstract Formation of the shrinkage defects in ductile iron castings is far more complicated phenomenon than in other casting alloys. In the paper one of the aspects of formation of porosity in this alloy was considered - changes in cast iron's density during crystallization caused by varying temperature, phase fractions and phase's composition. Computer model, using cellular automata method, for determination of changes in density of ductile iron during crystallization was applied. Simulation of solidification was conducted for 5 Fe-C binarie alloys with ES from 0.9 to 1.1 for the estimation

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19

Wu, Panpan, and Bo Yang. "Intermetallic PdIn catalyst for CO2 hydrogenation to methanol: mechanistic studies with a combined DFT and microkinetic modeling method." Catalysis Science & Technology 9, no. 21 (2019): 6102–13. http://dx.doi.org/10.1039/c9cy01242g.

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20

Myronenko, L.G, O.G. Peretyatko, and J.A. Iagniuk. "STUDY OF ENTEROCOCCI BIOFILM FORMATION USING PHOTOMETRIC METHOD WITH BIOFILM MODELING ON ABIOTIC POLYSTYRENE SURFACES." Annals of Mechnikov Institute, no. 4 (December 2, 2016): 97–101. https://doi.org/10.5281/zenodo.192327.

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Introduction. Static photometric method is widely used to determine the ability of biofilm formation. The essence of this method is to measure the optical density of the dye, eluated with a solvent from the biofilm. The aim of the study was to conduct a comparative analysis of the results of determining the enterococci biofilm formation using photometric method with biofilm modeling in 96-well microtiter plates and 4-section Petri dishes. Material and methods. The study was conducted using 61 strains of microorganisms genus Enterococcus, taken from the clinical material of patients with purule

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21

Mauborgne, Marie-Laure, R. J. Radtke, Christian Stoller, and Fabien Haranger. "Impact of the ENDF/B-VIII.0 library on modeling nuclear tools for oil exploration." EPJ Web of Conferences 239 (2020): 20007. http://dx.doi.org/10.1051/epjconf/202023920007.

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In the oil field, exploration of the subsurface through well logging provides measurements of the characteristics of rock formations and fluids to help identify and evaluate potential reservoirs. Downhole nuclear measurements focus on formation properties such as natural radioactivity, formation density, and hydrogen content, as well as the identification of the elemental and mineralogical composition of the rock through spectroscopy. Accurate nuclear modeling is a fundamental part of nuclear well logging tool development, from concept through design to response characterization. Underlying th

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22

Rohoman, Md Mahabubur, and Caizhi Zhou. "Crystal Plasticity Modeling of Dislocation Density Evolution in Cellular Dislocation Structures." Metals 15, no. 4 (2025): 419. https://doi.org/10.3390/met15040419.

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The complex thermal cycles during the solidification process in metal additive manufacturing (AM) lead to the formation of high-density dislocation networks, organizing into submicron-scale cellular structures. These ultrafine structures are recognized as crucial for enhancing the mechanical properties of AM metals. In this study, we investigate the evolution of dislocation density within these cellular structures under plastic deformation and its impact on mechanical response using dislocation density-based crystal plasticity finite element (CPFE) modeling. The model incorporates the evolutio

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23

Han, Y., A. K. Engstfeld, C. Z. Wang, L. D. Roelofs, R. J. Behm, and J. W. Evans. "Atomistic modeling of Ru nanocluster formation on graphene/Ru(0001): Thermodynamically versus kinetically directed-assembly." MRS Proceedings 1498 (2013): 249–54. http://dx.doi.org/10.1557/opl.2013.106.

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ABSTRACTAtomistic lattice-gas models for thermodynamically and kinetically directed assembly are applied to Ru nanocluster formation on a monolayer of graphene supported on Ru(0001) at 309 K. Nanocluster density, mean size, height distribution, and spatial ordering are analyzed by kinetic Monte Carlo simulations. Both models can reproduce the experimental data, but additional density functional theory analysis favors the former.

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Sugakov, V. I. "Peculiarities of formation of implanted atom density distribution beyond ion range." Nuclear Physics and Atomic Energy 10, no. 4 (2009): 395–402. https://doi.org/10.15407/jnpae2009.04.395.

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Modeling of diffusion processes of implanted atoms in crystal and point defects, created by irradiation, beyond ion range is fulfilled. The processes of recombination of implanted atoms with thermal vacancy play the key role. It is shown, that a region strong depleted by vacancies beyond the ion range arises. In the end of this region a spike of the probabilities of the recombination processes and also the spike of density of complexes of the vacancies with implanted atoms appear. The sizes of the region rise with increasing density of the flux of implanted ions and the number of defects in cr

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Mykola, Kukhtyn, Kravcheniuk Khrystyna, Beyko Ludmila, Horiuk Yulia, Skliar Oleksandr, and Kernychnyi Serhii. "MODELING THE PROCESS OF MICROBIAL BIOFILM FORMATION ON STAINLESS STEEL WITH A DIFFERENT SURFACE ROUGHNESS." Eastern-European Journal of Enterprise Technologies 2, no. 11 (98) (2019): 14–21. https://doi.org/10.15587/1729-4061.2019.160142.

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This paper reports a study into the process of<strong> </strong>bacteria adhesion to surfaces of different roughness depending on sizes and shapes. It was determined that at the surface of stainless steel with a roughness of 2.687±0.014 µm, the film formation process in E. coli and S. aureus occurred equally over 3 to 24 hours and did not depend on the size of bacteria. This makes it possible to argue that rod-shaped and coccal bacteria freely attach themselves in the grooves of roughness, followed by the initial process related to the first stage of a biofilm formation. Duri

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Petrenko, O., E. S. Geskin, G. A. Atanov, A. Semko, and B. Goldenberg. "Numerical Modeling of Formation of High-Speed Water Slugs." Journal of Fluids Engineering 126, no. 2 (2004): 206–9. http://dx.doi.org/10.1115/1.1669421.

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The objective of this work is to investigate acceleration of a water slug by the powder explosion. The process occurs in a device termed the water cannon, which entails a barrel with an attached nozzle. The explosion products expel the slug from the barrel at an extremely high speed. Due to the acceleration in the nozzle the speed of the slug significantly exceeds that of a bullet driven by the similar explosion. The computational procedure was used to evaluate the pressure, velocity and density fields in the course of slug acceleration in the x-t space. The procedure is based on the finite di

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27

Hayat, Khizar, Lourdes F. Vega, and Ahmed AlHajaj. "Modeling of Hierarchical Cathodes for Li-Air Batteries with Improved Discharge Capacity." Journal of The Electrochemical Society 168, no. 12 (2021): 120534. http://dx.doi.org/10.1149/1945-7111/ac42ef.

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The non-aqueous Li-air battery is considered to be a promising energy source for electric-vehicles owing to its ultrahigh theoretical energy density. However, its commercialization is limited by the attained lower energy density value, which is mainly due to pore blockage and passivation which requires a more strategic design of the cathode. In this work, we have developed and validated a detailed one-dimensional continuum model of Li-Air battery that helps in examining the potential of hierarchical cathodes in guiding and enhancing the efficiency of ions transport and discharge product format

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Asadov M.M., Mustafayeva S.N., Guseinova S.S., Lukichev V.F., and Tagiev D.B. "Modeling structural and energy characteristics of atoms in a GaS 2D-crystal with point defects." Physics of the Solid State 64, no. 1 (2022): 44. http://dx.doi.org/10.21883/pss.2022.01.52487.182.

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The properties of hexagonal gallium monosulphide (GaS) were modeled withinthe framework of the density functionality theory (DFT) taking into accountthe impact of vacancies related to a short range ordered structure. It isshown that electron irradiation of a GaS monolayer causes a decrease inconductivity due to formation of point defects. The band structure, densityof states and energy properties of GaS supercells with 36 and 48 atoms withmonovacancies were calculated. DFT calculations were performed to obtainvalues of the formation energy of GaS and Ga and S atom vacancies, as wellas to deter

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Mauborgne, Marie-Laure, Rubi Rodriguez, Françoise Allioli, et al. "Enhancing Accuracy and Range of Sourceless Density." (Petrophysics – The SPWLA Journal of Formation Evaluation and Reservoir Description 65, no. 6 (2024): 929–43. https://doi.org/10.30632/pjv65n6-2024a7.

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Formation density is a fundamental rock property and is a critical input in reservoir evaluations. Determining this critical measurement accurately requires utilizing a high-activity radioactive source in the drilling bottomhole assembly (BHA). The sourceless neutron-gamma density (sNGD) measurement based on a pulsed-neutron generator was introduced in logging-while-drilling (LWD) operations more than a decade ago, eliminating the need for radioactive source and the challenges associated with its handling, transportation, storage, and abandonment. The current sNGD algorithm has limitations in

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Meixner, Felix, Mohammad Reza Ahmadi, and Christof Sommitsch. "Modeling and Simulation of Pore Formation in a Bainitic Steel During Creep." Metallurgical and Materials Transactions A 53, no. 3 (2022): 984–99. http://dx.doi.org/10.1007/s11661-021-06569-y.

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AbstractIn the field of power engineering, where materials are subjected to high pressures at elevated temperatures for many decades, creep-resistant steels are put to work. Their service life is still, however, finite, as the many changes in their microstructure can merely be mitigated and not avoided. Creep cavitation is one of those changes and, in many cases, ultimately causes failure by rupture. In this work, a model is proposed to simulate the nucleation and growth of cavities during creep. This exclusively physics-based model uses modified forms of Classical Nucleation Theory and the On

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31

Artyushenko, V. M., and V. I. Volovach. "Methods of mathematical modeling of non-Gaussian random variables quantities and processes." Informacionno-technologicheskij vestnik, no. 3 (September 30, 2019): 15–21. http://dx.doi.org/10.21499/2409-1650-2019-3-15-21.

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Mathematical methods allowing to model non-Gaussian random variables and processes are considered. The models and description of non-Gaussian correlated processes in the form of generated Gaussian noise are analyzed, as well as the methods of formation of stationary random processes defined by the one-dimensional density distribution of Vero -abilities and the autocorrelation function. Examples of formation of non-Gaussian random variables and processes are given.

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Pascaning Setiahadiwibowo, Ajimas, Ari Setiawan, Salahuddin Husein, and Sismanto Sismanto. "SUBSURFACE STRUCTURAL MODELLING USING THE GRAVITY METHOD IN THE PACITAN AREA, INDONESIA BASED ON DERIVATIVE ANALYSIS AND MODEL INVERSION." Rudarsko-geološko-naftni zbornik 40, no. 1 (2025): 51–61. https://doi.org/10.17794/rgn.2025.1.4.

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The southern part of Java is dominated by volcanoes covered by thick and young volcanic deposits. Due to the complex subsurface conditions, active geophysical techniques such as seismic reflection cannot be used in this volcanic area. However, the gravity method provides a suitable alternative for geophysical exploration in this challenging environment. Gravity data obtained from satellite measurements was used to create Bouger anomaly maps to overcome this. Structural analysis in this research used derivative analysis, namely, first and second horizontal derivatives. The modelling was done us

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Siokis, Anastasios, Philippe A. Robert, and Michael Meyer-Hermann. "Agent-Based Modeling of T Cell Receptor Cooperativity." International Journal of Molecular Sciences 21, no. 18 (2020): 6473. http://dx.doi.org/10.3390/ijms21186473.

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Immunological synapse (IS) formation is a key event during antigen recognition by T cells. Recent experimental evidence suggests that the affinity between T cell receptors (TCRs) and antigen is actively modulated during the early steps of TCR signaling. In this work, we used an agent-based model to study possible mechanisms for affinity modulation during IS formation. We show that, without any specific active mechanism, the observed affinity between receptors and ligands evolves over time and depends on the density of ligands of the antigen peptide presented by major histocompatibility complex

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Antušek, Andrej, Martin Blaško, Miroslav Urban, et al. "Density functional theory modeling of C–Au chemical bond formation in gold implanted polyethylene." Physical Chemistry Chemical Physics 19, no. 42 (2017): 28897–906. http://dx.doi.org/10.1039/c7cp05637k.

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Jones, R. A., D. J. R. Taylor, R. F. T. Stepto, and I. M. Ward. "Computer modeling of the formation of radical pairs in amorphous high density polyethylene (HDPE)." Journal of Polymer Science Part B: Polymer Physics 34, no. 5 (1996): 901–8. http://dx.doi.org/10.1002/(sici)1099-0488(19960415)34:5<901::aid-polb9>3.0.co;2-o.

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Li, Songyan, Zhaomin Li, Riyi Lin, and Binfei Li. "Modeling of Sand Cleanout With Foam Fluid for Vertical Well." SPE Journal 15, no. 03 (2010): 805–11. http://dx.doi.org/10.2118/120449-pa.

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Summary Foam has proved to be effective and economical in underbalanced operations and is gaining wider applications in many areas. Foam fluid has low density and high blocking ability. It can effectively reduce leaking of fluid into formation in low-pressure wells, protecting the oil formation and improving sand-cleanout efficiency. According to energy-conservation equations, mass-conservation equations, and momentum-conservation equations, a mathematical model for sand cleanout with foam fluid was established that considers the heat transfer between foam in the annulus and foam in the tubing

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Gieser, C., D. Semenov, H. Beuther, et al. "Chemical complexity in high-mass star formation." Astronomy & Astrophysics 631 (November 2019): A142. http://dx.doi.org/10.1051/0004-6361/201935865.

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Aims. In order to understand the observed molecular diversity in high-mass star-forming regions, we have to determine the underlying physical and chemical structure of those regions at high angular resolution and over a range of evolutionary stages. Methods. We present a detailed observational and modeling study of the hot core VLA 3 in the high-mass star-forming region AFGL 2591, which is a target region of the NOrthern Extended Millimeter Array (NOEMA) large program CORE. Using NOEMA observations at 1.37 mm with an angular resolution of ~0″. 42 (1400 au at 3.33 kpc), we derived the physical

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Sentsov, A. A., and A. O. Agibalov. "Determination of seismic generation zones of Fennoscandia according to data of analysis of seismicity and computer geodynamic modelling." Moscow University Bulletin. Series 4. Geology 1, no. 1 (2022): 15–22. http://dx.doi.org/10.33623/0579-9406-2021-1-15-22.

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The work is devoted to the problem of identifying zones of seismic generstion zones of Fennoscandia, for the solution of which structural-geomorphological interpretation was carried out, seismicity analysis and computer modeling of the latest geodynamics were performed. According to the results of structural-geomorphological interpretation, the territory under consideration was divided into 6 large blocks. Computer modeling showed that each of them is characterized by a certain type of stress state in recent times, and also allowed us to calculate the probability of the formation of new short-

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Mirzaie, Mansooreh, Ahmad Barani, Naser Nematbakkhsh, and Majid Mohammad-Beigi. "Bayesian-OverDBC: A Bayesian Density-Based Approach for Modeling Overlapping Clusters." Mathematical Problems in Engineering 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/187053.

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Although most research in density-based clustering algorithms focused on finding distinct clusters, many real-world applications (such as gene functions in a gene regulatory network) have inherently overlapping clusters. Even with overlapping features, density-based clustering methods do not define a probabilistic model of data. Therefore, it is hard to determine how “good” clustering, predicting, and clustering new data into existing clusters are. Therefore, a probability model for overlap density-based clustering is a critical need for large data analysis. In this paper, a new Bayesian densi

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Nguyen, Huong Thuy, and Huong Thien Ha. "Optimization of affecting factors to glucuronic acid production in mature coconut fermentation." Science and Technology Development Journal 19, no. 1 (2016): 95–105. http://dx.doi.org/10.32508/stdj.v19i1.614.

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The process of mature coconut water fermentation by the complex of two bacteria strains Gluconacetobacter nataicola and Lactobacillus acidophilus in order to get high glucuronic acid concentration was studied. A Blackett – Burman matrix was designed to study the factors that affect glucuronic acid formation. After screening, four factors included G. Nataicola density, L. acidophilus density, sucrose concentration and temperature that have strongly contributed to glucuronic acid formation was selected to design a matrix for modeling optimal point. The result of Response surface methodology (RSM

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Mastropietro, Chiara. "Modeling a high velocity LMC: The formation of the Magellanic Stream." Proceedings of the International Astronomical Union 4, S256 (2008): 117–21. http://dx.doi.org/10.1017/s1743921308028330.

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AbstractI use high resolution N-body/SPH simulations to model the new proper motion of the Large Magellanic Cloud (LMC) within the Milky Way (MW) halo and investigate the effects of gravitational and hydrodynamical forces on the formation of the Magellanic Stream (MS). Both the LMC and the MW are fully self consistent galaxy models embedded in extended cuspy ΛCDM dark matter halos. I find that ram-pressure from a low density ionized halo is sufficient to remove a large amount of gas from the LMC's disk forming a trailing Stream that extends more than 120 degrees from the Cloud. Tidal forces el

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Chabanier, S., F. Bournaud, Y. Dubois, et al. "Formation of compact galaxies in the Extreme-Horizon simulation." Astronomy & Astrophysics 643 (November 2020): L8. http://dx.doi.org/10.1051/0004-6361/202038614.

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We present the Extreme-Horizon (EH) cosmological simulation, which models galaxy formation with stellar and active galactic nuclei (AGN) feedback and uses a very high resolution in the intergalactic and circumgalactic medium. Its high resolution in low-density regions results in smaller-size massive galaxies at a redshift of z = 2, which is in better agreement with observations compared to other simulations. We achieve this result thanks to the improved modeling of cold gas flows accreting onto galaxies. In addition, the EH simulation forms a population of particularly compact galaxies with st

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Rinaldo and A. Haris. "Characterization of Overpressure in Well Al, North Sumatra Basin: Evaluation of Pore Pressure Using the Eaton Method and Sonic-Density Crossplot." Jurnal Penelitian Pendidikan IPA 11, no. 4 (2025): 667–71. https://doi.org/10.29303/jppipa.v11i4.10911.

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The North Sumatra Basin is one of the major sedimentary basins in Indonesia with significant hydrocarbon potential. However, exploration in this region faces challenges due to overpressure, which can increase operational risks such as blowouts. This study aims to analyze pore pressure and overpressure formation mechanisms in Well Al using the Eaton method and a crossplot approach between sonic and density data. The analysis results indicate that the top overpressure is identified at a depth of 8,500 ft in the Keutapang Formation and continues into the Baong, Bampo, and Parapat Formations. Wire

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Volgin, V. M., T. B. Kabanova, I. V. Gnidina, and A. D. Davydov. "Modeling of Formation of Metal Microstructures by Local Electrodeposition on Conducting Substrate." Электрохимия 59, no. 9 (2023): 483–94. http://dx.doi.org/10.31857/s0424857023090116.

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The formation of metal microstructures on metal substrates is theoretically analyzed by the example of local silver electrodeposition using the numerical simulation of interrelated electrochemical and homogeneous chemical reactions.The distributions of the concentrations of the participants in the reactions and the current density of silver ion reduction are calculated for various concentrations of solution components and interelectrode distances. The degree of localization of metal deposition depends on the distribution of the concentrations of electroactive silver cations and the nonelectroa

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Bernard, T. N., F. D. Halpern, M. Francisquez, et al. "Kinetic modeling of neutral transport for a continuum gyrokinetic code." Physics of Plasmas 29, no. 5 (2022): 052501. http://dx.doi.org/10.1063/5.0087131.

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We present the first-of-its-kind coupling of a continuum full- f gyrokinetic turbulence model with a 6D continuum model for kinetic neutrals, carried out using the Gkeyll code. Our objective is to improve the first-principle understanding of the role of neutrals in plasma fueling, detachment, and their interaction with edge plasma profiles and turbulence statistics. Our model includes only atomic hydrogen and incorporates electron-impact ionization, charge exchange, and wall recycling. These features have been successfully verified with analytical predictions and benchmarked with the DEGAS2 Mo

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Chen, Yizhen, Suihong Chen, Didi Li, and Xi Jiang. "Density-Driven Convection for CO2 Solubility Trapping in Saline Aquifers: Modeling and Influencing Factors." Geotechnics 3, no. 1 (2023): 70–103. http://dx.doi.org/10.3390/geotechnics3010006.

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Industrial development has significantly increased the concentration of CO2 in the atmosphere, resulting in the greenhouse effect that harms the global climate and human health. CO2 sequestration in saline aquifers is considered to be one of the efficient ways to eliminate atmospheric CO2 levels. As an important mechanism, the solubility trapping greatly determines the efficiency of CO2 sequestration in saline aquifers, and this depends, in turn, on the density-driven convection that occurs during the sequestration. Density-driven convection is influenced by multiple factors. However, existing

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Liu, Zhiwei. "Conformity Model in Social Network Opinion Formation." Lecture Notes in Education Psychology and Public Media 81, no. 1 (2025): 185–94. https://doi.org/10.54254/2753-7048/2025.21105.

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The advent of social media has profoundly influenced how public opinion is formed and consolidated. This paper delves into the intricate dynamics of opinion stabilization within various network structures and examines the role of conformity in the opinion formation process. Drawing on existing theoretical frameworks, including social psychology and evolutionary game theory, this study uses agent-based modeling to simulate opinion dynamics across different network topologies. This study compares the mean stabilization times across basic structures (star, ring, tree) and complex structures (Bara

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Sergeyev, D., A. Duisenova, and Zh Embergenov. "Modeling of electrotransport properties of Li-intercalated graphene film." Journal of Physics: Conference Series 2140, no. 1 (2021): 012025. http://dx.doi.org/10.1088/1742-6596/2140/1/012025.

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Abstract In this work, within the framework of density functional theory combined with the method of nonequilibrium Green’s functions the density of states, transmission spectrum, current-voltage characteristics, and differential conductivity of Li-intercalated graphene (LiC6) have been determined. It is shown that in the energy range of -1.3÷-1.05 eV the quasiparticle transport through the nanostructure is disable. The features of IV- and dI/dV-characteristics of LiC6 in the form of decreasing of resistance in the range of -0.4÷0.4 V were revealed, and in the interval of 0.4÷1.4 V formation o

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Rizk, N. K., and H. C. Mongia. "Three-Dimensional Gas Turbine Combustor Emissions Modeling." Journal of Engineering for Gas Turbines and Power 115, no. 3 (1993): 603–11. http://dx.doi.org/10.1115/1.2906749.

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An emission model that combines the analytical capabilities of three-dimensional combustor performance codes with mathematical expressions based on detailed chemical kinetic scheme is formulated. The expressions provide the trends of formation and/or the consumption of Nox, CO, and UHC in various regions of the combustor utilizing the details of the flow and combustion characteristics given by the three-dimensional analysis. By this means, the optimization of the combustor design to minimize pollutant formation and maintain satisfactory stability and performance could be achieved. The develope

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Melnyk, Oleksiy, Oleg Onishchenko, Martin Jurkovič, Kostyantin Koryakin, and Oleksandr Storchak. "Modeling seawater distillation and scale deposition processes in shipboard equipment." E3S Web of Conferences 534 (2024): 01012. http://dx.doi.org/10.1051/e3sconf/202453401012.

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This study addresses the complexities of shipboard desalination plants and scaling control methods in seawater distillation systems. Using advanced modeling techniques, the study examines the interaction of various parameters affecting system performance. Factors such as seawater density, thermal conductivity and specific heat capacity are considered along with scale deposition parameters such as salt concentration, scale formation rate and deposition rate. The study includes thermodynamic analysis, scale formation kinetics and heat transfer between different components of the system. The effe

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