Journal articles: 'Computer calculations'

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Salinger, Victoria. "“Writing Calculations, Calculating Writing”: Hanne Darboven's Computer Art." Grey Room 65 (October 2016): 36–61. http://dx.doi.org/10.1162/grey_a_00207.

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Kuzin, V. V., S. N. Grigoriev, and M. A. Volosova. "Basics of computer engineering surface layer of polished ceramics." NOVYE OGNEUPORY (NEW REFRACTORIES), no. 6 (September 17, 2020): 64–69. http://dx.doi.org/10.17073/1683-4518-2020-6-64-69.

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The basic principles of computer engineering of the surface layer of polished ceramics are given. They are based on two calculation schemes, a mathematical model, algorithms for solving problems of stationary and unsteady thermoelasticity, an automated system of thermal strength calculations and a method for calculating horizontal and vertical displacements, temperature, stresses and stress intensity using the control point method.

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Snyder, Russell D. "Computer-Developed Structural Calculations." Practice Periodical on Structural Design and Construction 1, no. 4 (November 1996): 122–25. http://dx.doi.org/10.1061/(asce)1084-0680(1996)1:4(122).

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Sundman, Bo, and John Ågren. "Computer Applications in the Development of Steels." MRS Bulletin 24, no. 4 (April 1999): 32–36. http://dx.doi.org/10.1557/s0883769400052167.

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Despite the fact that thermodynamic calculations, strictly speaking, apply only to equilibrium, they may of ten be used in nonequilibrium situations. If one or several of the stable phases are suppressed in the calculations, we have a metastable equilibrium, which is often of practical interest. For example, one may calculate the driving force available to form the more stable phases and model nucleation.Thermodynamic calculations may be performed stepwise to predict microseg-regation during solidification by a Scheil-type calculation (no diffusion in the solid State, infinite diffusion in the liquid, and equilibrium at the interface). In such a calculation, no information other than the thermodynamic properties of the System is used.A more ambitious approach is to com-bine the thermodynamic calculations with kinetic modeis (e.g., diffusion calculations) and thereby predict the rate of reactions. This approach is extremely powerful and may be used to simulate a wide range of different phenomena, including precipitation, homogenization, and diffusional interactionsbetween Substrate and coating.It is usually assumed that thermodynamic equilibrium holds locally at the migrating phase interface between two phases, and the rate of transformation is calculated at each instant by solving a set of flux-balance equations. The fluxes are obtained from a numerical Solution of the multicomponent diffusion equations (see Reference 3).

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Wang, Zhi Wei, and Ling Qin Meng. "Computer-Aided Calculation of the Box Centroid of Linear Vibration Screener." Advanced Materials Research 580 (October 2012): 16–19. http://dx.doi.org/10.4028/www.scientific.net/amr.580.16.

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In the design of the vibration screener, the calculation of screen box centroid has direct impact on the performance of the vibration screening machine. In traditional design, calculation of the screen box centroid is carried out through repeated calculations and the adjustment of the vibrator installation, of which the calculation process is tedious with low accuracy. This thesis deduces the formula of calculating screen box centroid by the way of mass decomposition method, and programs for calculation of the box centroid of Linear vibration screener through C language. With the computer aid, the present author realizes the accurate calculation of screen box centroid and enhances the level of design for vibration screener.

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Budd, W. F., and R. C. Warner. "A computer scheme for rapid calculations of balance-flux distributions." Annals of Glaciology 23 (1996): 21–27. http://dx.doi.org/10.1017/s0260305500013215.

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A simple computer scheme developed by Budd and Smith (1985) and modified by D. Jenssen has been further developed to provide a rapid computation of steady-state balance fluxes over arbitrary ice masses, given the surface elevations and net accumulation distribution. The scheme provides a powerful diagnostic tool to examine the flux and state of balance over whole ice masses or limited regions to interpret field observations for dynamics or the state of balance. In many cases the uncertainty in the state of balance may be much less than the uncertainty in the deformation and sliding properties of the ice and so the flux and velocities derived from balance could provide a useful guide for the dynamics where direct observations are sparse. The scheme assumes that, on a horizontal scale of many ice thicknesses, the ice-flow direction is approximately down the steepest surface slope. The continuity equation is used to compute steady-state implied downslope fluxes at each grid point from integrations of the net accumulation over the area from the summits to the edges. The algorithm ensures the exact integral balance of the surface net flux over the area with flow through boundaries. Applications are demonstrated for the whole of Antarctica and for regional areas. Comparisons are made between fluxes computed from observed ice thicknesses and velocities and those computed from balance. The observed ice thicknesses can also be used to compute surface velocities from assumed column-to-surface velocity ratios. The combined fluxes from observations and balance can be used to compute rates of change of elevation with time.

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Budd, W. F., and R. C. Warner. "A computer scheme for rapid calculations of balance-flux distributions." Annals of Glaciology 23 (1996): 21–27. http://dx.doi.org/10.3189/s0260305500013215.

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A simple computer scheme developed by Budd and Smith (1985) and modified by D. Jenssen has been further developed to provide a rapid computation of steady-state balance fluxes over arbitrary ice masses, given the surface elevations and net accumulation distribution. The scheme provides a powerful diagnostic tool to examine the flux and state of balance over whole ice masses or limited regions to interpret field observations for dynamics or the state of balance.In many cases the uncertainty in the state of balance may be much less than the uncertainty in the deformation and sliding properties of the ice and so the flux and velocities derived from balance could provide a useful guide for the dynamics where direct observations are sparse.The scheme assumes that, on a horizontal scale of many ice thicknesses, the ice-flow direction is approximately down the steepest surface slope. The continuity equation is used to compute steady-state implied downslope fluxes at each grid point from integrations of the net accumulation over the area from the summits to the edges. The algorithm ensures the exact integral balance of the surface net flux over the area with flow through boundaries.Applications are demonstrated for the whole of Antarctica and for regional areas. Comparisons are made between fluxes computed from observed ice thicknesses and velocities and those computed from balance. The observed ice thicknesses can also be used to compute surface velocities from assumed column-to-surface velocity ratios. The combined fluxes from observations and balance can be used to compute rates of change of elevation with time.

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PREVE, NIKOLAOS P., and EMMANUEL N. PROTONOTARIOS. "MONTE CARLO SIMULATION ON COMPUTATIONAL FINANCE FOR GRID COMPUTING." International Journal of Modeling, Simulation, and Scientific Computing 03, no. 03 (May 17, 2012): 1250010. http://dx.doi.org/10.1142/s1793962312500109.

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Monte Carlo methods are a class of computational algorithms that rely on repeated random sampling to compute their results. Monte Carlo methods are often used in simulating complex systems. Because of their reliance on repeated computation of random or pseudo-random numbers, these methods are most suited to calculation by a computer and tend to be used when it is infeasible or impossible to compute an exact result with a deterministic algorithm. In finance, Monte Carlo simulation method is used to calculate the value of companies, to evaluate economic investments and financial derivatives. On the other hand, Grid Computing applies heterogeneous computer resources of many geographically disperse computers in a network in order to solve a single problem that requires a great number of computer processing cycles or access to large amounts of data. In this paper, we have developed a simulation based on Monte Carlo method which is applied on grid computing in order to predict through complex calculations the future trends in stock prices.

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Devin, Vladlen, Vasil Tkachuk, Vasil Burdega, and Ruslana Semenyshena. "COMPUTER TECHNOLOGIES IN THE CALCULATION OF GEOMETRIC CHARACTERISTICS OF COMPLEX SECTIONS." OPEN EDUCATIONAL E-ENVIRONMENT OF MODERN UNIVERSITY, no. 10 (2021): 67–76. http://dx.doi.org/10.28925/2414-0325.2021.107.

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None of the calculations for machine parts, structure elements and constructions for strength, rigidity and stability can be performed without using the geometric cross-section characteristics. These include: cross-sectional area, axial, centrifugal and polar moments of inertia, radius of gyration, axial and polar resistance moments of cross-section, etc. The article discusses the problem of technical specialties students` training quality improvement with information technologies aids. There is a review and proposed methodology of usage the software for calculating the geometric cross-sections properties. There are two groups of software: 1) software developed by teachers of higher educational institutions to use in the educational process; 2) industrial software for design engineers, which can also be used during the educational process. Using as an example the calculation of the geometric cross-sections properties of a complex section formed from several rolled profiles, it is demonstrated that the usage of programs "Geom 2006", "Compass 3D", "Consul" and "Constructor of sections" has the following advantages: decrease the costs of effort and time for routine mathematical calculations, makes it easier to find and correct errors made by manual calculations during individual study, which has a positive effect on the learning process; the implementation of calculation and graphic tasks using computer software significantly increases the interest of students for the discipline that is being studied and contributes to the better consolidation of theoretical knowledge and practical skills; students acquire skills in creating design schemes, preparing initial data, analyzing the obtained results, which are necessary for their further work with software systems for structures calculations during the course and for diploma design; it is especially useful to use the proposed programs for distance learning as an effective tool to organize individ-ual study.

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Korneva, O. S. "COMPUTER MODELING OF FINANCIAL CALCULATIONS." Informatics and education, no. 4 (June 24, 2019): 33–37. http://dx.doi.org/10.32517/0234-0453-2019-34-4-33-37.

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Within the implementation of the national strategy for improving financial competency and financial education in Russia, aimed at the broad masses of the population, any experience in promoting financial competency among young people, accumulated in the system of training bachelors of Economics, will be useful. The purpose of the article is to present the methodological and practical aspects of teaching the basics of financial calculations of future economists and the formation of computer modeling skills in the field of financial and economic activity. The reason for writing the article was the problem of interdisciplinary integration in the system of financial and economic education. The analysis of educational literature and curricula of the system of secondary and higher professional education, as well as the study and generalization of pedagogical experience showed weak integration of mathematical and economic disciplines with information technologies. The article also presents the problems associated with the calculations in the financial and economic activities with the use of computer modeling. The elements of the presented methods of teaching the basics of financial computing in conjunction with the modeling of financial problems on the computer can be useful for both school teachers and university teachers of mathematics and computer science.

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Kostis, William J. "Computer Graphics for Bayes Calculations." Medical Decision Making 15, no. 3 (August 1995): 290. http://dx.doi.org/10.1177/0272989x9501500316.

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Mallik, A. K. "Computer calculations of phase diagrams." Bulletin of Materials Science 8, no. 2 (May 1986): 107–21. http://dx.doi.org/10.1007/bf02744176.

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13

Murphy, W. F. "On vibrational force field calculations." Canadian Journal of Chemistry 69, no. 11 (November 1, 1991): 1672–78. http://dx.doi.org/10.1139/v91-245.

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A series of computer routines for performing normal coordinate calculations of harmonic vibrational frequencies is described. These are designed for operation on current-generation computers having direct-access storage. Example results are given for the chain isomer of disulfur difluoride. Key words: vibrational force field calculations, normal coordinate calculations, harmonic force fields.

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Michalski, Rafal, and Ryszard J. Radwanski. "Computer Calculations of the Thermally-Induced Magnetic and Electronic Properties of the Rare Earth Compounds RERu₂Si₂." Materials Science Forum 480-481 (March 2005): 617–22. http://dx.doi.org/10.4028/www.scientific.net/msf.480-481.617.

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The aim of this paper is to demonstrate the effectiveness of the calculation method, which takes into consideration the electrostatic ligands field as well as the the magnetic interactions. Our calculations method based on crystal field (CEF) together with the Zeeman effect in one Hamiltonian and allows calculating many of the temperature dependencies of the magnetic and electronic properties of the rare earth compounds. The result of the calculations shows the accuracy of the approach even for the intermetallic compounds. The obtained results for calculations of the compounds of the family in RERu2Si2 (RE – rare-earth element) are fully confirmed the experimental data such as: the easy magnetic direction of all the analyzed compounds, the thermal dependencies of magnetic properties; in particular the giant magnetocrystalline anisotropy of PrRu2S2 with the calculated anisotropy field BA>400T, in-plain anisotropy of ErRu2Si2, the cause of difficulty in magnetic ordering of compounds TmRu2Si2 and YbRu2Si2 as well as effects and dependencies not foreseen before. In this paper we have put together the elementary calculated magnetic properties for the chosen compounds of RERu2Si2 in the paramagnetic region. All Calculations are on the basis of the calculating computer package BIREC 1.51.

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Umam, Khotibul. "Pemanfaatan Software Berbasis Matrik dalam Perhitungan Konstruksi Statis Tak Tentu pada Mekanika Teknik Lanjut." JURNAL DINAMIKA VOKASIONAL TEKNIK MESIN 1, no. 1 (October 28, 2016): 57. http://dx.doi.org/10.21831/dinamika.v1i1.11458.

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Along with the rapid development of personal computers, the use of computer software for various purposes is also increased. The calculation in engineering mechanics course, especially in the process of calculating statically indeterminate structures, the use of matrix is essentials. Matrix calculation were once considered less favorable, particularly in higher order matrices. It became much easier and much faster after the use of computer software capable of processing the matrix calculation. The advantages of using computer software for matrix calculation can also be used for engineering calculations in general.--------------------------------------------------------------------------------------Sejalan dengan pesatnya perkembangan komputer pribadi, penggunaan perangkat lunak komputer untuk berbagai keperluan juga semakin meningkat. Pada perhitungan mata kuliah mekanika teknik, terutama pada proses perhitungan konstruksi statis tak tentu, penggunaan matrik yang sebelumnya dianggap sebagai perhitungan yang kurang menguntungkan, terutama pada matrik yang berordo tinggi, menjadi jauh lebih mudah dan cepat dengan bantuan perangkat lunak komputer yang berkemampuan mengolah matrik. Manfaat dari pemanfaatan perangkat lunak ini dapat digunakan sebagai alat bantu perhitungan matrik keperluan teknik secara umum. Penggunaan perangkat lunak komputer berbasis matrik pada proses perhitungan konstruksi statis tak tentu mempunyai beberapa keuntungan dibanding dengan metode lainnya yaitu: (a) membutuhkan pemahaman yang lebih mudah, (b) tingkat akurasi bisa didapat sesuai dengan keinginan, (c) kecepatan penyelesaian yang tinggi.

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Billah, MM, MS Hossain, MR Islam, and MA Rahman. "Selection of V-Belt for Power Transmission in Agricultural Machinery." Progressive Agriculture 19, no. 2 (November 11, 2013): 187–94. http://dx.doi.org/10.3329/pa.v19i2.16961.

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The solution of a v-belt design problem depends upon many data tables, figures, equations and sequence of calculations. To solve such a problem a computer program is developed which facilitates the design procedure by fast computation with less drudgery and more accuracy. Computed result shows the diameter of smaller and larger sheave, center distance, belt length, belt number, required number of belt, belt cross-section, as output after calculation. The computer-generated output by using this program is found more accurate and efficient than the conventional calculation method.DOI: http://dx.doi.org/10.3329/pa.v19i2.16961 Progress. Agric. 19(2): 187 - 194, 2008

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FUJISHIMA, MINORU. "LSI-BASED EFFICIENT EMULATION OVERCOMING ALGORITHMIC RESTRICTIONS INHERENT IN QUANTUM COMPUTERS." Fluctuation and Noise Letters 03, no. 04 (December 2003): C9—C17. http://dx.doi.org/10.1142/s0219477503001476.

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Quantum computers are believed to perform high-speed calculations, compared with conventional computers. However, the quantum computer solves NP (non-deterministic polynomial) problems at a high speed only when a periodic function can be used in the process of calculation. To overcome the restrictions stemming from the quantum algorithm, we are studying the emulation by a LSI (large scale integrated circuit). In this report, first, it is explained why a periodic function is required for the algorithm of a quantum computer. Then, it is shown that the LSI emulator can solve NP problems at a high speed without using a periodic function.

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MAKSYM, P. A. "SUPERCELL RHEED CALCULATIONS." Surface Review and Letters 06, no. 03n04 (June 1999): 451–60. http://dx.doi.org/10.1142/s0218625x99000457.

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Efficient calculational techniques for reflection high energy electron diffraction (RHEED) are reported for surfaces with large periodic supercells. A fast Fourier transform approach enables the computer time scaling of a conventional RHEED calculation to be reduced to n2 log (n), where n is the number of diffracted beams used in the calculation. The special technique needed to implement this for arbitrary incident azimuths with symmetry optimization is detailed. A Green's function method is also introduced which is particularly suitable for calculations for imperfect surfaces. This combines the conventional approach to RHEED for dealing with substrate diffraction with a Green's function treatment for an imperfect surface of supercells and has n log (n) time scaling. Techniques for matching the results of the conventional and Green's function treatments at the substrate–surface interface are given. In addition, numerical procedures for solving the resulting equations are described and a selection of illustrative results is presented.

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Sazonova, Svetlana, Viktor Asminin, and Alla Zvyaginceva. "Analysis by the mixed method of statically indeterminate frames with elements of increased rigidity and numerical verification of the calculation results using the finite element method." Modeling of systems and processes 14, no. 2 (July 26, 2021): 54–66. http://dx.doi.org/10.12737/2219-0767-2021-14-2-54-66.

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The sequence of application of the mixed method for calculating internal forces in statically indeterminate frames with elements of increased rigidity is given. The main system is chosen for the frame with one kinematic and one force unknown. The canonical equations of the mixed method are written, taking into account their meaning. Completed the construction of the final diagram of the bending moments and all the necessary calculations and checks. When calculating integrals, Vereshchagin's rule is applied. The solution of the problem is checked by performing the calculation using the computer program STAB12.EXE; the results of the calculations are numerically verified using the finite element method. An example of the formation of the initial data for the STAB12.EXE program and the subsequent processing of the calculation results, the rules for comparing the numerical results and the results obtained in the calculation of the frame by the mixed method are given.

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Bash, P., U. Singh, R. Langridge, and P. Kollman. "Free energy calculations by computer simulation." Science 236, no. 4801 (May 1, 1987): 564–68. http://dx.doi.org/10.1126/science.3576184.

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Ross, Robert M., and Andrew S. Jackson. "Exercise Concepts, Calculations, and Computer Applications." Medicine & Science in Sports & Exercise 23, no. 7 (July 1991): 887. http://dx.doi.org/10.1249/00005768-199107000-00028.

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Sykes, Alan M. "Doing ANOVA calculations on the computer." ACM SIGAPL APL Quote Quad 25, no. 4 (June 8, 1995): 206–12. http://dx.doi.org/10.1145/206944.207007.

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Lachance, Russ, and Andrew Biaglow. "Titration Calculations with Computer Algebra Software." PRIMUS 22, no. 4 (May 2012): 317–37. http://dx.doi.org/10.1080/10511970.2010.538135.

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Grant, Casey C. "Computer-aided Halon 1301 piping calculations." Fire Safety Journal 9, no. 2 (July 1985): 171–79. http://dx.doi.org/10.1016/0379-7112(85)90005-0.

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Mawston, I. G. "Computer model for battery paste calculations." Journal of Power Sources 28, no. 1-2 (November 1989): 127–40. http://dx.doi.org/10.1016/0378-7753(89)80086-2.

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Pollney, Denis, Peter Musgrave, Kevin Santosuosso, and Kayll Lake. "Algorithms for computer algebra calculations in spacetime: I. The calculation of curvature." Classical and Quantum Gravity 13, no. 8 (August 1996): 2289–309. http://dx.doi.org/10.1088/0264-9381/13/8/021.

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Voronova, Nataliya A., Anatoliy I. Kupchishin, Alexander A. Kupchishin, Akmaral A. Kuatbayeva, and Tatyana A. Shmygaleva. "Computer Modeling of Depth Distribution of Vacancy Nanoclusters in Ion-Irradiated Materials." Key Engineering Materials 769 (April 2018): 358–63. http://dx.doi.org/10.4028/www.scientific.net/kem.769.358.

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In this work, the calculation algorithms of cascade and probability functions and vacancy nanoclusters concentration were developed and their calculations for various incident particles in silicon and iron were made.

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KARPENKO, N. P., and M. A. SHIRYAEVA. "METHODS OF FORECAST CALCULATION OF GROUND WATER BACKWATER IN THE ZONE OF HYDRAULIC STRUCTURES INFLUENCE." Prirodoobustrojstvo, no. 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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KANAYA, KAZUYUKI. "QCD CALCULATIONS ON QCDPAX." International Journal of Modern Physics C 04, no. 06 (December 1993): 1221–32. http://dx.doi.org/10.1142/s0129183193000963.

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The results of main QCD calculations performed on the dedicated parallel computer QCDPAX are reviewed. A project to construct a new parallel computer aiming at the peak performance of 300 GFLOPS is reported.

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Ochkov, V. F., K. A. Orlov, E. V. Dorokhov, and V. M. Lavygin. "Heat engineering: computer calculations with measurement units." Vestnik IGEU, no. 1 (2016): 10–18. http://dx.doi.org/10.17588/2072-2672.2016.1.010-018.

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Hall, B. D. "Uncertainty calculations using object-oriented computer modelling." Measurement Science and Technology 10, no. 5 (January 1, 1999): 380–86. http://dx.doi.org/10.1088/0957-0233/10/5/307.

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Komissarov, Yu A., and Dam Quang Sang. "Multicomponent distillation calculations using computer simulation principles." Theoretical Foundations of Chemical Engineering 48, no. 3 (May 2014): 280–87. http://dx.doi.org/10.1134/s0040579514030087.

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Kharinov, M. V. "Interpretation of image information for computer calculations." Pattern Recognition and Image Analysis 17, no. 1 (March 2007): 117–24. http://dx.doi.org/10.1134/s1054661807010130.

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Brown, Barry W., James Lovato, and Kathy Russell. "Asymptotic power calculations: description, examples, computer code." Statistics in Medicine 18, no. 22 (November 30, 1999): 3137–51. http://dx.doi.org/10.1002/(sici)1097-0258(19991130)18:22<3137::aid-sim239>3.0.co;2-o.

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Banerjee, J. R., A. J. Sobey, H. Su, and J. P. Fitch. "Use of computer algebra in Hamiltonian calculations." Advances in Engineering Software 39, no. 6 (June 2008): 521–25. http://dx.doi.org/10.1016/j.advengsoft.2007.03.013.

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Boitsov, A. A., I. B. Gornushkin, and Kh I. Zil'bershtein. "Computer calculations in atomic emission spectral analysis." Journal of Applied Spectroscopy 44, no. 3 (March 1986): 215–21. http://dx.doi.org/10.1007/bf00662048.

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Tuttle, Kenneth L., and Chih Wu. "Computer-Based Thermodynamics." Journal of Educational Technology Systems 30, no. 4 (June 2002): 427–36. http://dx.doi.org/10.2190/b0x1-r5pw-lcyj-yyme.

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A new computer-based approach to teaching thermodynamics is being developed and tried by two mechanical engineering professors at the U.S. Naval Academy. The course uses sophisticated software, in this case CyclePad, to work all of the homework problems. A new text, written with traditional theory but computer-based problems, accommodates the new approach. The new course is scheduled for Fall Term 2001 at the Naval Academy. Computer-based thermodynamics courses teach the same theory as traditional thermodynamics courses as well as the same types of problems. However, traditional thermodynamic cycle hand calculations are replaced by cycle calculations using CyclePad. This new example of Intelligent Computer-Assisted Instruction, ICAI, switches emphasis from learning cycle calculations to learning cause and effect through parametric analysis. Parametric analysis is made feasible through experimentation using computer models. For this, CyclePad has artificial intelligence, sensitivity analysis and graphical presentation capabilities. Traditionally, thermodynamics culminates in analysis of the thermodynamic cycles. In this course, students will progress well beyond traditional thermodynamics courses by emphasizing cycle analysis.

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Daudt, C. R., L. W. Braile, R. L. Nowack, and C. S. Chiang. "A comparison of finite-difference and fourier method calculations of synthetic seismograms." Bulletin of the Seismological Society of America 79, no. 4 (August 1, 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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Landin, Peter J. "Calculations." Higher-Order and Symbolic Computation 22, no. 4 (December 2009): 333–59. http://dx.doi.org/10.1007/s10990-010-9059-3.

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Novikov, Sergey, Boris Zhadanovsky, and Sergey Sinenko. "Guidelines on calculation of the concrete thermal treatment modes." MATEC Web of Conferences 178 (2018): 09007. http://dx.doi.org/10.1051/matecconf/201817809007.

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The article provides guidelines on calculation of the cast-inplace reinforced concrete thermal treatment modes: the problem of thermal treatment mode by setting the mathematical temperature field model in the hardening concrete has been solved; model equation which allows calculating the temperature field in the hardening concrete structure using computer software has been solved. These data allow to achieve the high quality of concrete at minimum heat treatment duration and the maximum reduction of energy costs, while minimizing experimental calculations.

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Maciejczyk, Andrzej. "Shaft design using the inventor generator. Verification of the calculation module." AUTOBUSY – Technika, Eksploatacja, Systemy Transportowe 19, no. 6 (June 30, 2018): 568–72. http://dx.doi.org/10.24136/atest.2018.135.

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Paper presented the design process of an example shaft with the use of an Inventor generator, preceded by preliminary analytical fatigue calculations. The operation of the generator is discussed. Procedures of load introduction are indicated. The operation of the calculation module was analyzed. The results obtained by analytical calculations with those obtained during computer simulation were compared. The method of selecting the diameter of the shaft spigot without the need to perform tedious preliminary calculations is presented.

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Marcinkevičius, Andrejus Henrikas. "A Computer Program Design for Optimization of a Cylindrical Traverse Grinding Operations." Solid State Phenomena 147-149 (January 2009): 387–92. http://dx.doi.org/10.4028/www.scientific.net/ssp.147-149.387.

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Traverse cylindrical grinding productivity and accuracy depend on many factors of rough, fine and spark out grinding. Evaluation of all these factors at manual calculation of the process plan is impossible, for that reason the engineer technologist selects the cutting rates approximately, and they are far from optimal. We have deduced equations for calculation of optimal cutting rates for that purpose. Because of task complexity the computer program was designed for calculations which is described in this paper.

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Naidych, B. P. "Calculation of the Stability and Reconstruction of the Crystal Surface within DFT-Calculations." Фізика і хімія твердого тіла 19, no. 3 (October 4, 2019): 254–57. http://dx.doi.org/10.15330/pcss.19.3.254-257.

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The thin films’ surface is not perfect, so its properties and properties of the massive part of the film willdiffer significantly. Since a regularity in the formation of surface irregularities is observed, then the possibilitiesof computer modeling can be used to study such structures. To reproduce the surface of crystals with a NaClstructure, one can apply the same approaches in modeling properties as for metal oxides. The fundamentaldifference from the previous studies is in considering the structure in the direction (111), since such assumptionsallows to use a smaller simulation cell for computer calculations, which greatly speed them up. Approbation ofthe technique of repositioning the surface of lead sulfide thin films has been carried out.

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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, no. 02 (February 26, 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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Kilaas, Roar. "Interactive simulation of high-resolution electron micrographs." Proceedings, annual meeting, Electron Microscopy Society of America 45 (August 1987): 66–69. http://dx.doi.org/10.1017/s0424820100125336.

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Only a few years ago image simulation of HRTEM images were mostly carried out as low priority jobs on large mainframe computers with images available the next day as overprinted characters on computer paper. Today the same calculation can be carried out on a dedicated workstation in a matter of minutes with output on high resolution video monitors. This improvement in computer hardware has produced a shift from software primarily designed to run as batch jobs to interactive software that allows instant changes to both the atomic model and microscope parameters. In these near “real time” calculations the user interface becomes an important part of the software, since setting up the conditions for the calculation may take longer than the calculation itself.In an attempt to create a truly interactive environment for simulation of HRTEM images, a new set of programs has been written at the National Center for Electron Microscopy (NCEM) at Berkeley.

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Agapov, V. P., and K. R. Aydemirov. "INVESTIGATION OF THE CARRYING CAPACITY OF REINFORCED CONCRETE SLABS WITH CRACKS AFTER THEIR REINFORCEMENT WITH COMPOSITE FABRICS BY THE FINITE ELEMENT METHOD USING THE PRINS COMPUTER COMPLEX." Herald of Dagestan State Technical University. Technical Sciences 45, no. 4 (June 27, 2019): 142–52. http://dx.doi.org/10.21822/2073-6185-2018-45-4-142-152.

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Objectives. The finite element method for cracked reinforced concrete slabs analysis after they were reinforced with composite fabrics in order to determine the residual safety factor is considered. Method. The method is based on the use of algorithms for calculating of structures with the account of the geometrical and physical nonlinearities, implemented in the PRINS program. These algorithms assume the use of the same calculation scheme in the process of the problem solving. However, the specifics of the assigned problem is that the design sсheme of the structure before the appearance of defects in it and after its amplification with the help of composite materials should change. Result. Taking into account this circumstance, the algorithms of nonlinear calculation of structures under the PRINS program were supplemented with an option that allows changing the parameters of the design scheme in the process of through calculation. To study the bearing capacity of reinforced concrete slabs, multilayer finite elements are used, for each of which a specific package of materials is specified. Modernization of the design scheme in this case comes down to replacing one package of materials with another. An example of calculation of a slab with a crack reinforced with composite fabric is given. Conclusion. It is shown that the use of a tunable design scheme can significantly improve the accuracy of calculations. In this case, the final result depends on what stage of the formation of defects in the slab its strengthening is realized. The special multilayered finite elements of a quadrangular shape are used in calculations. The elements consist of four simple triangles, for which most of the matrix characteristics are calculated in a closed form. This is especially important when carrying out nonlinear calculations that require repeated computations of these characteristics.

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Barlow, Arthur, and Max Diem. "Normal coordinate calculations as a classroom computer project." Journal of Chemical Education 68, no. 1 (January 1991): 35. http://dx.doi.org/10.1021/ed068p35.

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Klopman, Gilles, Congmei Ding, and Orest T. Macina. "Computer Aided Olive Oil−Gas Partition Coefficient Calculations." Journal of Chemical Information and Computer Sciences 37, no. 3 (May 1997): 569–75. http://dx.doi.org/10.1021/ci960140l.

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Stiefvater, Otto L., and H. D. Rudolph. "Structure Calculations on 1,3,4-Thiadiazole with Computer Programs." Zeitschrift für Naturforschung A 44, no. 2 (February 1, 1989): 95–98. http://dx.doi.org/10.1515/zna-1989-0202.

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AbstractInsertion of the 14 available sets of isotopic moments of 1,3,4-thiadiazole into the computer programs GEOM or RU 111/115 confirms the previously hand-calculated structure parameters of this molecule, but does not further improve the accuracy of those results.

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Knight, GeorgeJ, JamesE Haddow, GlennE Palomaki, JohnM Donhowe, DavidL Witte, B. Eiben, and U. Sancken. "Computer software programs and Down's syndrome risk calculations." Lancet 347, no. 9014 (June 1996): 1553–54. http://dx.doi.org/10.1016/s0140-6736(96)90706-0.

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Journal articles on the topic 'Computer calculations'

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