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Artigos de revistas sobre o tema "Calculations model"

Autor: Grafiati

Publicado: 4 de junho de 2021

Última modificação: 8 de fevereiro de 2022

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1

Weiwei Cai, Weiwei Cai, e Lin Ma Lin Ma. "Improved Monte Carlo model for multiple scattering calculations". Chinese Optics Letters 10, n.º 1 (2012): 012901–12904. http://dx.doi.org/10.3788/col201210.012901.

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2

Senkin, I. S., L. I. Akmadieva e E. V. Belonogov. "OPTIMIZATION OF INTEGRATED PRODUCTION MODEL CALCULATIONS". Энергия: экономика, техника, экология, n.º 2 (2020): 67–72. http://dx.doi.org/10.7868/s2587739920020093.

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The article discusses a new technique for optimizing the calculations of the integrated model, all stages of the calculations are analyzed. The analysis of the necessary input data for the integrated model is carried out and the definition of the calculation results according to the obtained method is given. Comparison of calculations using the developed method and a commercial package is obtained. Opportunities for applying the obtained solution are proposed.

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3

Wendisch, Manfred, Jost Heintzenberg e Markus Bussemer. "Measurement-based aerosol forcing calculations: The influence of model complexity". Meteorologische Zeitschrift 10, n.º 1 (15 de março de 2001): 45–60. http://dx.doi.org/10.1127/0941-2948/2001/0010-0045.

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4

Ning, P., e D. Halderson. "Microscopic Lane-model calculations". Journal of Physics G: Nuclear Physics 11, n.º 7 (julho de 1985): 827–34. http://dx.doi.org/10.1088/0305-4616/11/7/007.

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5

Gur, O., e A. Rosen. "Comparison between blade-element models of propellers". Aeronautical Journal 112, n.º 1138 (dezembro de 2008): 689–704. http://dx.doi.org/10.1017/s0001924000002669.

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Abstract Blade-element models are the most common models for the analysis of propeller aerodynamics, performance calculations and propeller design. In spite of their simplicity these models are very efficient and accurate. Blade-element models use the local induced velocities as an input thus they should be combined with another model in order to calculate these induced velocities. Various models are used for the calculation of the induced velocity, where the most popular ones include: momentum, simplified-momentum, lifting-line (prescribed and free wake), and vortex (McCormick and Theodorsen) models. The paper describes the various models, compares their results and discusses the advantages and disadvantages of each one. The results indicate that the Bladeelement/simplified-momentum model offers very good accuracy together with high efficiency. For propeller performance calculations during steady axial flight, where most of the cross-sections do not experience stall, detailed and complicated models for calculating the induced velocities do not show advantages over the simple bladeelement/simplified-momentum model,

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6

Gileva, Lyubov, Sergey Kartashov, Anatoliy Zuev e Vyacheslav Ivanov. "Verification of the CFD calculation for the centrifugal compressor medium flow model stages with the help of supercomputer". MATEC Web of Conferences 245 (2018): 09011. http://dx.doi.org/10.1051/matecconf/201824509011.

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The goal of this work is to develop recommendations for the calculating problem formulation of the medium flow centrifugal compressor characteristics by computational fluid dynamics methods with the assessment of the computing resources necessary costs. Calculations are made on supercomputers of SPbPU “Polytechnic” and “DeltaCluster”. The object of the research is the centrifugal compressor stage for which the flow investigation has been held in the whole passage. The calculations result comparison with the practical experiment data for the whole working characteristics are shown in this work. The leakage in the lap seals and between the disks gaps investigation work has been made. The calculation of the whole 2π flat pattern has been made and also the influence on the calculation results of the between mesh interfaces has been analyzed.

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7

Tsibulskiy, Svyatoslav, Nikolay Galashov, Denis Mel'nikov, Alexandr Kiselev e Al'bina Bannova. "Improvement air condensers evaluation model". MATEC Web of Conferences 194 (2018): 01017. http://dx.doi.org/10.1051/matecconf/201819401017.

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The results of analysis of the literature on the calculation of the heat transfer coefficient of an air condenser in the flow past a bundle of finned tubes by an air flow. The methods of calculation are disassembled, marked advantages and disadvantages of each. Calculations of the heat transfer coefficient for each method are given; the results compared with the experimental data.

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8

Karedin, Volodymyr, e Nadiya Pavlenko. "CREDO RADON UA – INFORMATION MODEL FOR CALCULATION OF ROAD CONSTRACTION". Avtoshliakhovyk Ukrayiny, n.º 3 (259) ’ 2019 (17 de outubro de 2019): 34–42. http://dx.doi.org/10.33868/0365-8392-2019-3-259-34-42.

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CREDO RADON UA software provides an automated calculation of the strength of the pavement structures of non-rigid and rigid types, as well as the calculation of the strengthening of existing structures. In the article, one can see the main features and functionality of the CREDO RADON UA software, the main points in the calculations according to the new regulations. Information support of the design process includes necessary databases, informational and helping materials that make up the full support of the pavement design process. The concept of CREDO RADON UA 1.0 software is made on the use of elasticity theory methods in calculations of initial information models of pavements. Performing optimization calculations, the roadwear in CREDO RADON UA is designed in such a way that no unacceptable residual deformation occurs under the influence of short-term dynamic or static loading in the working layer of the earth bed and in the structural layers during the lifetime of the structure. The calculation algorithms were made in accordance with the current regulatory documents of Ukraine. CREDO RADON UA software allows user to create information bases on road construction materials and vehicles as part of the traffic flow for calculations. The presented system of automated modeling makes it easier for the customer to control the quality of design solutions, to reasonably assign designs to layers of reinforcement, to quickly make comparisons of calculations of different designs for the optimal use of allocated funds. Prospects for further improvement of the program should be the results of theoretical and experimental studies on filling the databases, which are used as information support for automated design of road structures. Keywords: CREDO RADON UA, road, computer-aided design, repair project, road pavement, strengthening, construction, rigid pavement, elasticity module, a transport stream, calculation method, information support, dynamic or static loading.

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9

Tie, X., G. Brasseur e Z. Ying. "Impact of model resolution on chemical ozone formation in Mexico City; application of the WRF-Chem model". Atmospheric Chemistry and Physics Discussions 10, n.º 4 (16 de abril de 2010): 9801–38. http://dx.doi.org/10.5194/acpd-10-9801-2010.

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Abstract. The resolution of regional chemical/dynamical models has important effects on the calculation of distributions of air pollutants in large cities. In this study, the sensitivity of air pollutants and photochemical O3 production to different model resolutions is studied by using a regional chemical/dynamical model (version 3 of Weather Research and Forecasting Chemical model – WRF-Chemv3) in Mexico City. The model results with 3, 6, 12, and 24 km resolutions are compared to the surface measurements for CO, NOx, and O3. The study shows that the model resolutions with 3 and 6 km have reasonable simulations of surface CO, NOx, and O3 concentrations and diurnal variations. The model results intend to underestimate the measurements when the resolution is reduced to 12 km. The calculated surface CO, NOx, and O3 concentrations significantly underestimate the measured values at 24 km resolution. This study suggests that 12 km is a threshold resolution for the O3 and O3 precursor calculations for using a regional chemical/dynamical model in Mexico City. There are three major factors related to the effects of model resolution on the calculations of O3 and O3 precursors, including; (1) the calculated meteorological conditions with different model resolutions, (2) the emission spatial distribution of ozone precursors, and (3) the non-linearly O3 photochemical productions with different resolutions. Model studies suggest that model resolution (resulting in different meteorological condition and transport process) have larger impacts than emission inventory resolutions for the calculations of O3 and O3 precursors. The model calculations show that with coarse resolution of emission inventory (24 km) and fine meteorological condition resolution (6 km), the calculated CO and O3 are considerably improved compared to the calculation with coarse resolution for both emission inventory and meteorological condition (24 km), suggesting that the impacts of resolution on meteorological condition and transport process are largest for the calculations of O3 and O3 precursors. The emission resolution has important effects on the calculation, but the effects are smaller than the model resolution. This study also suggests that the changes of O3 precursors at different resolutions lead to important impacts on O3 chemical formation due to the non-linear relationship between O3 formation and O3 precursors. Finally, this study suggests that with the balance between the model performance and required computation time, the 6 km resolution is an optimal resolution for the calculation of O3 and O3 precursors in Mexico City.

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10

Okhrimenko, Viacheslav, e Maiia Zbіtnieva. "Mathematical Model of Tubular Linear Induction Motor". Mathematical Modelling of Engineering Problems 8, n.º 1 (28 de fevereiro de 2021): 103–9. http://dx.doi.org/10.18280/mmep.080113.

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Problem of calculation of distribution of magnetic field induction in clearance of tubular linear induction motor (TLIM) is considered. Mathematical model is represented by Fredholm integral equations of second kind for complexes of electric field strength and density of coupled magnetization currents at interface of environments. Algorithm of calculation of distribution of magnetic field induction in TLIM clearance has been developed. Dependence of magnetic field induction in motor clearance on value of pole division is investigated. There is area of optimum pole pitch. Reliability of results of calculations on mathematical model is confirmed by their comparison with results obtained on physical model. Calculated dependence of induction on thickness of runner's iron circuit also has extreme character. Given model can be used at design stage of TLIM. Model allows calculating its optimal geometric dimensions based on criterion of maximum induction in motor clearance, taking into account physical properties of applied materials.

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11

Murashkin, Vasiliy, e Gennadiy Murashkin. "Application of concrete deformation model for calculation of bearing capacity of reinforced concrete structures". MATEC Web of Conferences 196 (2018): 04008. http://dx.doi.org/10.1051/matecconf/201819604008.

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The paper presents a brief historical reference of the theory of reinforced concrete structures calculation and its. It shows that modeling of concrete deformations makes it possible not only to carry out calculations of durability and to determine reinforced concrete elements deflection under the estimated load, but also to analyze their a stress-strain state at each stage. The study suggests a new model of concrete deformation which makes it possible to make calculations of concrete elements with characteristics which are different from those given in specification documents. The researchers use the proposed model of deformation and calculate curved reinforced concrete beam bearing capacity. These calculations for normally reinforced elements do not considerably differ from the calculations given in the documents. All the main functional dependencies on the calculation stages are visualized.

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12

KAMIMURA, M., Y. KINO e E. HIYAMA. "STAU-CATALYZED BIG-BANG NUCLEOSYNTHESIS AND NUCLEAR CLUSTER MODEL". International Journal of Modern Physics A 24, n.º 11 (30 de abril de 2009): 2076–83. http://dx.doi.org/10.1142/s0217751x09045649.

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Three-body cluster-model calculations are performed for the new types of big-bang nucleosynthesis (BBN) reactions that are calalyzed by a supersymmetric (SUSY) particle stau, a scalar partner of the tau lepton. If a stau has a lifetime ≳ 103s, it would capture a light element previously synthesized in standard BBN and form a Coulombic bound state. The bound state, an exotic atom, is expected to induce various reactions, such as (αX-) + d → 6 Li + X-, in which a negatively charged stau (denoted as X-) works as a catalyzer. Recent literature papers have claimed that some of these stau-catalyzed reactions have significantly large cross sections so that inclusion of the reactions into the BBN network calculation can change drastically abundances of some elements, giving not only a solution to the 6 Li -7 Li problem (calculated underproduction of 6 Li by ~ 1000 times and overproduction of 7 Li +7 Be by ~ 3 times) but also a constraint on the lifetime and the primordial abundance of the elementary particle stau. However, most of these literature calculations of the reaction cross sections were made assuming too naive models or approximations that are unsuitable for those complicated low-energy nuclear reactions. We use a few-body calculational method developed by the authors, and provides precise cross sections and rates of the stau-catalyzed BBN reactions for the use in the BBN network calculation.

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13

Kamenický, Ján, Eduard Malenovský e Jaroslav Zapomel. "Numerical Analysis of Dynamic Properties of Nonlinear Rotor Systems of Aircraft Jet Engines". International Journal of Rotating Machinery 6, n.º 5 (2000): 333–43. http://dx.doi.org/10.1155/s1023621x00000312.

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The paper deals with a manner of modelling and results of the calculation of dynamic properties and vibrations of the double spool aircraft turbofan engine AI-25, used in aeroplanes L-39 (Albatross). The calculations take into account the flexibilities of the engine's both coaxial rotors, their supports (including their hydrodynamic dampers), and its casing as well. Besides the short description of the engine design peculiarities and of its calculating model, there is also a short description of the used method of calculations, with focus on its peculiarities as well. Finally, some results of calculations and conclusions that follow from them are presented.The calculating model of the engine is considered as a dynamic system that consists of two coaxial rotors, their flexible supports, and the engine casing. The model respects nonlinear elements between rotating and nonrotating parts of the engine, such as e.g., the oil squeeze damper, the labyrinth sealing, etc. The rotor system is considered as rotationally symmetric and with internal material damping. The basic calculating model is based on the finite elements method (FEM). For the more demanding nonlinear problems which would allow to respect also the flexibilities of the engine stator parts and especially their experimentally obtained data, the method of dynamic compliances was found to be more successful. It was also found that the nonlinear problems of complicated rotor systems require special algorithms of calculations to be applied.

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14

Caurier, E. "Frontier of shell model calculations". Nuclear Physics A 704, n.º 1-4 (17 de junho de 2002): 60–68. http://dx.doi.org/10.1016/s0375-9474(02)00766-2.

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15

Otsuka, Takaharu, Takahiro Mizusaki e Michio Honma. "Monte Carlo shell-model calculations". Journal of Physics G: Nuclear and Particle Physics 25, n.º 4 (1 de janeiro de 1999): 699–715. http://dx.doi.org/10.1088/0954-3899/25/4/023.

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16

Gueorguiev, V. G., e J. P. Draayer. "Oblique-Basis Shell-Model Calculations". Acta Physica Hungarica A) Heavy Ion Physics 19, n.º 3-4 (1 de abril de 2004): 213–16. http://dx.doi.org/10.1556/aph.19.2004.3-4.8.

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17

Schaich, W. L. "Model calculations of inverse photoemission". Physical Review B 45, n.º 7 (15 de fevereiro de 1992): 3744–48. http://dx.doi.org/10.1103/physrevb.45.3744.

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18

Navrátil, P., e J. Dobe. "Model calculations using boson mappings". Physical Review C 40, n.º 5 (1 de novembro de 1989): 2371–76. http://dx.doi.org/10.1103/physrevc.40.2371.

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19

Schimmer, M., R. Wirowski e P. von Brentano. "Shell-model calculations in 114Sn". Nuclear Physics A 587, n.º 3 (maio de 1995): 465–74. http://dx.doi.org/10.1016/0375-9474(95)00030-5.

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20

Nauchitel, Vladimir V., e Rajmund L. Somorjai. "Antigen-antibody recognition. Model calculations". Biophysical Chemistry 51, n.º 2-3 (agosto de 1994): 337–47. http://dx.doi.org/10.1016/0301-4622(94)00054-9.

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21

Eskola, S. "Deposition to forest—Model calculations". Journal of Aerosol Science 17, n.º 3 (janeiro de 1986): 382–84. http://dx.doi.org/10.1016/0021-8502(86)90109-6.

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22

Springborg, Michael. "Model calculations for cis polyacetylene". Synthetic Metals 28, n.º 3 (fevereiro de 1989): D527—D532. http://dx.doi.org/10.1016/0379-6779(89)90740-6.

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23

Kucuk, Y., e J. A. Tostevin. "Three-body-model calculations for22C". Journal of Physics: Conference Series 381 (18 de setembro de 2012): 012109. http://dx.doi.org/10.1088/1742-6596/381/1/012109.

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24

Brivio, G. P., M. L. Rossi e T. B. Grimley. "Model calculations for dissociative sticking". Surface Science 352-354 (maio de 1996): 184–88. http://dx.doi.org/10.1016/0039-6028(95)01128-5.

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25

Arvanitis, C., F. Geniet, M. Iacomi, J. L. Kneur e A. Neveu. "Variational Solution of the Gross–Neveu Model: Finite N and Renormalization". International Journal of Modern Physics A 12, n.º 19 (30 de julho de 1997): 3307–34. http://dx.doi.org/10.1142/s0217751x97001730.

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We show how to perform systematically improvable variational calculations in the O(2N) Gross–Neveu model for generic N, in such a way that all infinities usually plaguing such calculations are accounted for in a way compatible with the perturbative renormalization group. The final point is a general framework for the calculation of nonperturbative quantities like condensates, masses, etc., in an asymptotically free field theory. For the Gross–Neveu model, the numerical results obtained from a "two-loop" variational calculation are in a very good agreement with exact quantities down to low values of N.

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26

KARPENKO, N. P., e M. A. SHIRYAEVA. "METHODS OF FORECAST CALCULATION OF GROUND WATER BACKWATER IN THE ZONE OF HYDRAULIC STRUCTURES INFLUENCE". Prirodoobustrojstvo, n.º 5 (2020): 109–16. http://dx.doi.org/10.26897/1997-6011-2020-5-109-116.

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The purpose of the work is to consider methods for calculating the forecast of groundwater backwater in the zone of influence of hydraulic structures. The analysis of analytical dependences of calculation of the forecast of groundwater backwater for various calculation schemes is carried out. For a homogeneous scheme of the geofiltration structure, a numerical model is proposed and a computational program for calculating the groundwater backwater is developed. It allows calculating the groundwater backwater from the channel at any time in the discrete mode. To simplify the solution of the problem of calculating the groundwater backwater, a computer program was created in the programming language Phyton Version 8.3 which quickly solves this hydrogeological problem. A possible range of geofiltration parameters is proposed for calculating the groundwater backwater near main channels. The adaptation and implementation of the software model was carried out for a specific object – the Bolshoy Stavropol channel-5, for which forecast calculations were made. The results of predictive calculations of groundwater backwater are the basis for the assessment of areas of possible flooding – the territory within which the level of ground water increases as a result of their backup by a hydraulic structure.

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Zoliana, B., Zaithanzauva Pachuau, Lalthakimi Zadeng, R. K. Thapa, P. K. Patra e D. T. Khathing. "A Model Photoemission Calculations Using Projection Operator Method". International Journal of Modern Physics B 17, n.º 15 (20 de junho de 2003): 2897–902. http://dx.doi.org/10.1142/s0217979203020739.

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We have shown in this report the application of projection operator method of group theory in deriving the wavefunctions for the surface state in Cu(110) which had been used in calculating photocurrent. This approach gives a qualitative characterization of surface states simply on the basis of existing bulk-band structure calculations.

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Фищенко, P. Fishchenko, Каменских, A. Kamenskikh, Мазунин, I. Mazunin, Семёнов, K. Semenov, Медяков e A. Medyakov. "MATHEMATICAL MODEL OF THE FLEXIBLE MANIPULATOR". Alternative energy sources in the transport-technological complex: problems and prospects of rational use of 3, n.º 1 (16 de março de 2016): 443–46. http://dx.doi.org/10.12737/17909.

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In article construction of the flexible manipulator is considered and the method of calculation of its mathematical model is described. Formulas for calculations are given. The purpose of development of a mathematical model is improving governance and possibility of simulation of movement of the flexible manipulator

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Galliková, Jana, Vladimír Stuchlý, Roman Poprocký e Peter Volna. "Model calculations of posterior reliability indicators for the proposal of the maintenance system". MATEC Web of Conferences 157 (2018): 08003. http://dx.doi.org/10.1051/matecconf/201815708003.

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Designing the content and scale of maintenance of machines and equipment by a priori and posterior reliability methods in considered crucial to reducing the cost of the machine's life cycle, maintaining high operational readiness and reducing the consequences of failures. In the presented paper, attention is paid to the analysis of the calculation methods of posterior reliability for calculation indicators of reliability and to the use of the specified Weibull model for reliability calculations. The obtained results are further developed for models of optimal process calculations to perform scheduled maintenance interventions. Calculations of the other RAMS (reliability, availability, maintainability and safety) indicators that are critical to the design of an optimal engineering design with regard to maintenance and which do not receive sufficient attention in technical practice are also assessed.

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Coraggio, L., A. Covello, A. Gargano e N. Itaco. "Core polarization and modern realistic shell-model Hamiltonians". International Journal of Modern Physics E 26, n.º 01n02 (janeiro de 2017): 1740006. http://dx.doi.org/10.1142/s0218301317400067.

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The understanding of the convergence properties of the shell-model effective Hamiltonian, within the framework of the many-body perturbation theory, is a long-standing problem. The infinite summation of a certain class of diagrams, the so-called “bubble diagrams,” may be provided calculating the Kirson–Babu–Brown induced interaction, and provides a valid instrument to study whether or not the finite summation of the perturbative series is well-grounded. Here, we perform an application of the calculation of the Kirson–Babu–Brown induced interaction to derive the shell-model effective Hamiltonian for [Formula: see text]-shell nuclei starting from a modern nucleon–nucleon potential, obtained by way of the chiral perturbation theory. The outcome of our calculation is compared with a standard calculation of the shell-model Hamiltonian, where the core-polarization effects are calculated only up to third-order in perturbation theory. The results of the two calculations are very close to each other, evidencing that the perturbative approach to the derivation of the shell-model Hamiltonian is still a valid tool for nuclear structure studies.

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Wang, Jia-Wen. "Multi-Criteria Decision-Making Method Based on a Weighted 2-Tuple Fuzzy Linguistic Representation Model". International Journal of Information Technology & Decision Making 20, n.º 02 (26 de fevereiro de 2021): 619–34. http://dx.doi.org/10.1142/s0219622021500085.

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Multi-criteria decision-making (MCDM) methods are used in the selection and evaluation of alternatives. However, too many decision criteria and numerical calculations will increase the computational complexity and make the calculation process difficult to understand. In this paper, a weighted 2-tuple fuzzy linguistic representation model is proposed. The contributions of this study are as follows: (1) Feature selection method was used to remove the redundant or irrelevant feature attributes, thereby simplifying calculations and reducing calculation complexities. (2) The integration of the 2-tuple linguistic representation model simplifies the complexity of numerical calculations. The calculation of qualitative scales can be closer to the human thinking model, and loss of information can be avoided during calculations through the appropriate model. (3) Information fusion technology, i.e., ordered weighted average operator (OWA), was used. The method simplifies the traditional OWA calculation and can be calculated according to the priority order of the indicators. (4) Four major shareholding companies in Taiwan 50 ETF stocks were selected as experimental cases. In total, 992 tuples were obtained and 29 technical indicators were analyzed. The results indicate that case A1 is the most stable among the four stocks considered under different decision-making situations, and it has the first priority ranking.

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Proncheva, Olga, Yulia Danik e Mikhail Dmitriev. "ONE MODEL OF MIGRATION FLOWS CONTROL". Computational Mathematics and Information Technologies 1, n.º 2 (2020): 94–100. http://dx.doi.org/10.23947/2587-8999-2020-1-2-94-100.

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The paper presents a discrete optimal control problem with constraints on which a method for calculation of migration flows, where qualified and unskilled workers are distinguished, is discussed. At the same time, the optimality criterion in the problem is associated with the achievement of the maximum output with the minimization of the total number of migrants. Numerical calculations are provided that illustrate the sustainable growth scenario over a 10 year period. The work objectives included the development of an approach for calculating the necessary size of working-age population migration and its components to achieve optimal output growth. A macromodel is proposed, which is a discrete optimal control problem. An algorithm for the control synthesis is pro-posed. Numerical modeling is carried out. The obtained results can be used in migration flows planning and management processes.

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Husain, Syed Zahid, e Claude Girard. "Impact of Consistent Semi-Lagrangian Trajectory Calculations on Numerical Weather Prediction Performance". Monthly Weather Review 145, n.º 10 (outubro de 2017): 4127–50. http://dx.doi.org/10.1175/mwr-d-17-0138.1.

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Inconsistencies may arise in numerical weather prediction models—that are based on semi-Lagrangian advection—when the governing dynamical and the kinematic trajectory equations are discretized in a dissimilar manner. This study presents consistent trajectory calculation approaches, both in the presence and absence of off-centering in the discretized dynamical equations. Both uniform and differential off-centering in the discretized dynamical equations have been considered. The proposed consistent trajectory calculations are evaluated using numerical experiments involving a nonhydrostatic two-dimensional theoretical mountain case and hydrostatic global forecasts. The experiments are carried out using the Global Environmental Multiscale model. Both the choice of the averaging method for approximating the velocity integral in the discretized trajectory equations and the interpolation scheme for calculating the departure positions are found to be important for consistent trajectory calculations. Results from the numerical experiments confirm that the proposed consistent trajectory calculation approaches not only improve numerical consistency, but also improve forecast accuracy.

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Li, D. H., R. A. Moore e S. Wang. "Variational thermodynamic calculations for some liquid sd metals". Canadian Journal of Physics 64, n.º 1 (1 de janeiro de 1986): 75–83. http://dx.doi.org/10.1139/p86-011.

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A tractable and reliable expression for the one valence-electron eigenenergies, required in calculating the total energy of a disordered sd-type metal, is formulated in the context of the model-potential theory. With the aid of this expression, the variational calculation of the Helmholtz free energy using the hard-sphere model as a reference system, as employed in ab initio calculations of the thermodynamic properties for the nearly-free-electron-like (NFE) liquid metals, can now be extended with reasonable accuracy to those liquid sd metals in which the d-like valence-electron states below the Fermi level are not very localized. Also, the ab initio-type pseudopotential calculation of the interionic pair potentials, as carried out for the NFE-like metals in the literature, is made practical for these sd metals in their disordered states.

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Malyavina, Elena, Olga Malikova e Luong Van Pham. "Influence of detailing the climate model on the calculation of energy consumption". E3S Web of Conferences 164 (2020): 02008. http://dx.doi.org/10.1051/e3sconf/202016402008.

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The repeatability of outdoor air temperature and enthalpy combinations in a construction area is a necessary initial information for calculating the energy consumption of air conditioning systems. The most convenient form of presenting climatic data in such calculations is the probabilistic-statistical model, which constitutes a Table, the cells of which show the probabilistic repeatability of the outdoor air temperature and relative humidity. The parameter values given on the vertical and horizontal scales, that form the cell boundaries, can be taken with larger or smaller increments. The paper that served as the basis for this article, provides verification of the initial climatic model detailing experimentally under full-scale conditions in the city of Hanoi (Vietnam). The criterion for the appropriate model detailing was the deviation of the energy consumption estimates of the room cooling system, got experimentally and by calculation. Moreover, the calculations were performed not only on two climate probabilistic and statistical models, but also on the data of direct measurements of the outdoor air temperature and relative humidity with an accuracy of 0.1 for temperature and up to 2 % for relative humidity.

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Mazich, K. A., P. C. Killgoar e J. A. Ingram. "Mean-Field Calculations of the Dynamic Mechanical Properties of Heterogeneous Elastomer Blends". Rubber Chemistry and Technology 62, n.º 2 (1 de maio de 1989): 305–14. http://dx.doi.org/10.5254/1.3536246.

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Abstract A method for calculating the dynamic mechanical properties of elastomer blends with co-continuous structures has been presented. The calculations are based on Kerner's packed-grain model for composite media. Comparisons of theoretical calculations with experimental data show that this model closely approximates the viscoelastic properties of blends with a co-continuous structure, at least in the glass-transition regions of the respective blend components. We have also shown that the storage modulus of co-continuous blends may be well-represented by a discrete-particle model. This result can be misleading, however, if the storage modulus alone is calculated and compared with experimental data. A comparison of viscoelastic data (log E′ and tan δ) with calculation clearly distinguishes the models and indicates that the packed-grain model is the correct representation of the structure of co-continuous blends. The agreement between theory and experiment reported above was principally found in the glass-transition regions of the respective components in the elastomer blend. We extended the comparison well into the rubbery region and found that the agreement between Kerner's mean-field theory and the experimental data was poor, particularly for the loss tangent. Different relaxation mechanisms (relaxations over greater periods of time) are available to the blend in the rubbery region of viscoelastic response, and these mechanisms are apparently not accounted for in the mean-field calculations.

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Rai, S., A. Biswas e B. Mukherjee. "Nuclear structure of low-lying states in 60,62,64,66Zn — A shell model description". International Journal of Modern Physics E 25, n.º 11 (novembro de 2016): 1650099. http://dx.doi.org/10.1142/s0218301316500993.

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Shell model calculation has been performed for even–even [Formula: see text]Zn using NuShellX code in [Formula: see text] model space with two different effective Hamiltonians, viz. JUN45 and jj44b. The low-lying structure is studied up to angular momentum, [Formula: see text] = 10[Formula: see text] by calculating level energies, reduced transition probabilities, occupation numbers, lifetimes, and quadrupole moments. The results of the calculations are compared with the available experimental data. It is observed that the inclusion of 1[Formula: see text] orbital in the model space is essential to understand nuclear structure in these isotopes. Shell model calculation with an improved set of effective Hamiltonian parameters and inclusion of [Formula: see text] orbital in the model space are necessary in order to produce finer agreement with the experimental observations.

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Daudt, C. R., L. W. Braile, R. L. Nowack e C. S. Chiang. "A comparison of finite-difference and fourier method calculations of synthetic seismograms". Bulletin of the Seismological Society of America 79, n.º 4 (1 de agosto de 1989): 1210–30. http://dx.doi.org/10.1785/bssa0790041210.

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Abstract The Fourier method, the second-order finite-difference method, and a fourth-order implicit finite-difference method have been tested using analytical phase and group velocity calculations, homogeneous velocity model calculations for disperson analysis, two-dimensional layered-interface calculations, comparisons with the Cagniard-de Hoop method, and calculations for a laterally heterogeneous model. Group velocity rather than phase velocity dispersion calculations are shown to be a more useful aid in predicting the frequency-dependent travel-time errors resulting from grid dispersion, and in establishing criteria for estimating equivalent accuracy between discrete grid methods. Comparison of the Fourier method with the Cagniard-de Hoop method showed that the Fourier method produced accurate seismic traces for a planar interface model even when a relatively coarse grid calculation was used. Computations using an IBM 3083 showed that Fourier method calculations using fourth-order time derivatives can be performed using as little as one-fourth the CPU time of an equivalent second-order finite-difference calculation. The Fourier method required a factor of 20 less computer storage than the equivalent second-order finite-difference calculation. The fourth-order finite-difference method required two-thirds the CPU time and a factor of 4 less computer storage than the second-order calculation. For comparison purposes, equivalent runs were determined by allowing a group velocity error tolerance of 2.5 per cent numerical dispersion for the maximum seismic frequency in each calculation. The Fourier method was also applied to a laterally heterogeneous model consisting of random velocity variations in the lower half-space. Seismograms for the random velocity model resulted in anticipated variations in amplitude with distance, particularly for refracted phases.

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Kurguzov, Konstantin V., e Igor K. Fomenko. "Piles and lateral loads: comparison of calculation methods". Vestnik MGSU, n.º 10 (outubro de 2019): 1280–91. http://dx.doi.org/10.22227/1997-0935.2019.10.1280-1291.

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Introduction. Calculation and analysis of pile resistance to loads remains to be a relevant problem in geoengineering. The design of pile foundations is currently performed using diverse analytical, empirical and numerical methods. However, the reliability of these methods remains to be a topic of interest among researchers and designers. This research paper analyses methods used for calculating the lateral-load capacity of piles in comparison with field-test data. Materials and methods. The paper dwells upon the development of reliable analytical expressions based on mathematical models of the pile–soil interaction. Main existing mathematical models of the soil environment, including the Mohr – Coulomb elastic ideal plastic model and the hardening soil model (HSM) were analysed. A particular attention was paid to a variety of factors affecting the pile–soil interaction, such as natural factors, pile types, pile sinking depth and technology, configurations of loads, as well as time-changed processes. A comparison of methods for calculating the lateral-load capacity of piles was conducted. To that end, calculations using the Mohr – Coulomb model and the local elastic strain theory (still required by building codes) were performed. High-level solid elements were used to develop and compute a finite-element pile-in-soil model in a spatial setting. Another model on the basis of parametric pile elements was designed using the MIDAS software. Results. It is established that the use of numerical calculation methods for evaluating the capacity and movements of pile foundations provides results comparable to those of field tests. These methods demonstrate a higher reliability compared to standardized analytical techniques. Conclusions. The reliability of numerical calculations of pile resistance to lateral impact is shown to be sufficiently high, thus being feasible for use in geoengineering. The use of these methods should be based on advanced non-linear soil models, such as HS, CamClay, etc.

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Khoirunnisa, Ni'ma, e Siti Achiria. "Model Perhitungan Biaya Produksi Islami Menggunakan Metode Variable Costing (Studi Kasus Usaha Susu Shi Jeckex Cabang Jogja)". JESI (Jurnal Ekonomi Syariah Indonesia) 9, n.º 1 (26 de setembro de 2019): 9. http://dx.doi.org/10.21927/jesi.2019.9(1).9-19.

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<p><em>Every company is required to run its business very well. The success of a company is very much determined by the accuracy and ability of the leader in managing the company. Production costs are one part of the internal steps that must be taken in increasing efficiency. In Islam there is a classification of costs before calculating production costs because not all funds that come out are calculated as production costs. The company can exercise control over activities that do not add value, which refers to cost control to be effective by applying Variable Coasting methods. Because it is seen from the method of calculation, the variable costing approach is more practical and easy to analyze. The results show that, using a calculation with a variable costing approach, the total production costs are lower than the calculation of real use, which is Rp. 55. 718,000 while using the real calculation, the results are greater, which is Rp. It can be seen that the calculation of the company's real production costs is higher than the calculation of production costs using the variable costing method. There is also the main difference between the real calculation of the company and the calculation of variable costing which is located in the treatment of factory overhead costs. The company's real calculations use fixed factory overhead and variable calculations while the variable costing method only calculates variable overhead costs.</em></p><p><strong><em>Keywords</em></strong><em> : Cost, Productions Cost, Variable Costing</em></p>

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Солопанов e Mihail Solopanov. "Developing a model of optimal control of the transport system at different levels of the hierarchy". Forestry Engineering Journal 4, n.º 1 (21 de abril de 2014): 100–103. http://dx.doi.org/10.12737/3352.

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Different options of intensity of use of vehicle control management are compared, as a result, a series of different options and assumptions are taken on real processes proactive. The design of such processes is expressed in various types of calculations: the calculation of forest management, computational scheme for calculating the forest management as a multi-stage optimization problem, modeling of forest fund dynamics, the algorithm for determining the allowable cut on the basis of simulation. The result is an economic and mathematical model, which is characterized by indicators of resources productivity.

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Uchida, Haruhisa, Venantius Grajewski e Eckehard Fromm. "Model calculations of metal film oxidation." Bulletin of the Japan Institute of Metals 29, n.º 12 (1990): 990–98. http://dx.doi.org/10.2320/materia1962.29.990.

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Bevelacqua, J. J. "FCC Model Calculations for4He Excited States". Physics Essays 7, n.º 4 (dezembro de 1994): 389–95. http://dx.doi.org/10.4006/1.3029154.

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Dikmen, E. "Time Dependence of Shell Model Calculations". Mathematical and Computational Applications 11, n.º 1 (1 de abril de 2006): 41–49. http://dx.doi.org/10.3390/mca11010041.

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Chakraborty, Tapash. "Variational calculations for the Sutherland model". Physical Review B 39, n.º 1 (1 de janeiro de 1989): 869–72. http://dx.doi.org/10.1103/physrevb.39.869.

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Kim, B. T., e T. Udagawa. "Method for nonlocal optical model calculations". Physical Review C 42, n.º 3 (1 de setembro de 1990): 1147–49. http://dx.doi.org/10.1103/physrevc.42.1147.

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Harder, M. K., P. Halse e L. Frankland. "Shell-model calculations nearN=Z=28". Journal of Physics G: Nuclear and Particle Physics 25, n.º 4 (1 de janeiro de 1999): 867–69. http://dx.doi.org/10.1088/0954-3899/25/4/057.

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Zheng, D. C., e B. R. Barrett. "Nuclear shell-model calculations forLi6andN14with differentNNpotentials". Physical Review C 49, n.º 6 (1 de junho de 1994): 3342–45. http://dx.doi.org/10.1103/physrevc.49.3342.

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Horoi, M., B. A. Brown e V. Zelevinsky. "Truncation method for shell model calculations". Physical Review C 50, n.º 5 (1 de novembro de 1994): R2274—R2277. http://dx.doi.org/10.1103/physrevc.50.r2274.

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Mila, F., e K. Penc. "Model calculations for 1D correlated systems". Journal of Electron Spectroscopy and Related Phenomena 117-118 (junho de 2001): 451–67. http://dx.doi.org/10.1016/s0368-2048(01)00269-9.

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