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Littérature scientifique sur le sujet « Unbounded source »

Auteur : Grafiati

Publié le 9 mars 2023

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Articles de revues sur le sujet "Unbounded source"

Natalini, R. "Unbounded solutions for conservation laws with source." Nonlinear Analysis: Theory, Methods & Applications 21, no. 5 (1993): 349–62. http://dx.doi.org/10.1016/0362-546x(93)90078-7.

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Cox, G., and R. Chitty. "Some Source-Dependent effects of unbounded fires." Combustion and Flame 60, no. 3 (1985): 219–32. http://dx.doi.org/10.1016/0010-2180(85)90027-6.

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Demir, Kaya, and Salih Ergün. "An Analysis of Deterministic Chaos as an Entropy Source for Random Number Generators." Entropy 20, no. 12 (2018): 957. http://dx.doi.org/10.3390/e20120957.

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This paper presents an analytical study on the use of deterministic chaos as an entropy source for the generation of random numbers. The chaotic signal generated by a phase-locked loop (PLL) device is investigated using numerical simulations. Depending on the system parameters, the chaos originating from the PLL device can be either bounded or unbounded in the phase direction. Bounded and unbounded chaos differs in terms of the flatness of the power spectrum associated with the chaotic signal. Random bits are generated by regular sampling of the signal from bounded and unbounded chaos. A white Gaussian noise source is also sampled regularly to generate random bits. By varying the sampling frequency, and based on the autocorrelation and the approximate entropy analysis of the resulting bit sequences, a comparison is made between bounded chaos, unbounded chaos and Gaussian white noise as an entropy source for random number generators.

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ALEKSEEV, G. V. "Multidimensional inverse source problems of underwater acoustics." European Journal of Applied Mathematics 9, no. 6 (1998): 589–605. http://dx.doi.org/10.1017/s0956792598003611.

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We consider linear and nonlinear inverse source problems of sound radiation in an unbounded domain which models an oceanic waveguide. The method for analysing their solvability is based on analytical properties of generalized acoustic potentials and the theory of extremal problems.

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CONAND, NICOLE, and ALICIA DORNADIC. "The Ethnographer Unbounded: Considering open source in corporate environments." Ethnographic Praxis in Industry Conference Proceedings 2012, no. 1 (2012): 88–100. http://dx.doi.org/10.1111/j.1559-8918.2012.00011.x.

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SPEIRS, DAVID C., S. L. McCONVILLE, K. M. GILLESPIE, A. D. R. PHELPS, and K. RONALD. "Numerical simulations of unbounded cyclotron-maser emissions." Journal of Plasma Physics 79, no. 6 (2013): 999–1001. http://dx.doi.org/10.1017/s0022377813001141.

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AbstractNumerical simulations have been conducted to study the spatial growth rate and emission topology of the cyclotron-maser instability responsible for stellar/planetary auroral magnetospheric radio emission and intense non-thermal radio emission in other astrophysical contexts. These simulations were carried out in an unconstrained geometry, so that the conditions existing within the source region of some natural electron cyclotron masers could be more closely modelled. The results have significant bearing on the radiation propagation and coupling characteristics within the source region of such non-thermal radio emissions.

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Wu, Zhen. "Fully coupled FBSDE with Brownian motion and Poisson process in stopping time duration." Journal of the Australian Mathematical Society 74, no. 2 (2003): 249–66. http://dx.doi.org/10.1017/s1446788700003281.

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AbstractWe first give the existence and uniqueness result and a comparison theorem for backward stochastic differential equations with Brownian motion and Poisson process as the noise source in stopping time (unbounded) duration. Then we obtain the existence and uniqueness result for fully coupled forward-backward stochastic differential equation with Brownian motion and Poisson process in stopping time (unbounded) duration. We also proved a comparison theorem for this kind of equation.

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Hofmann, Bernd, Peter Mathé, and Heinrich von Weizsäcker. "Regularization in Hilbert space under unbounded operators and general source conditions." Inverse Problems 25, no. 11 (2009): 115013. http://dx.doi.org/10.1088/0266-5611/25/11/115013.

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Rozanov, Yu A. "On Evolution of Random Fields with an Ultra Unbounded Stochastic Source." Theory of Probability & Its Applications 38, no. 2 (1994): 316–29. http://dx.doi.org/10.1137/1138028.

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Marklein, René, Karl J. Langenberg, and Torsten Kaczorowski. "Electromagnetic and elastodynamic point source excitation of unbounded homogeneous anisotropic media." Radio Science 31, no. 6 (1996): 1919–30. http://dx.doi.org/10.1029/96rs02155.

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Thèses sur le sujet "Unbounded source"

MARCELLINI, FRANCESCA. "Conservation laws in gas dynamics and traffic flow." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2009. http://hdl.handle.net/10281/7487.

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This PhD thesis is concerned with applications of nonlinear systems of conservation laws to gas dynamics and traffic flow modeling. The first part is devoted to the analytical description of a fluid flowing in a tube with varying cross section. We study the 2x2 model of the p-system and than, we extend the properties to the full 3x3 Euler system. We also consider a general nxn strictly hyperbolic system of balance laws; we study the Cauchy problem for this system and we apply this result to the fluid flow in a pipe wiyh varying section. Concerning traffic flow, we introduce a new macroscopic model, based on a non-smooth 2x2 system of conservation laws. We study the Riemann problem for this system and the qualitative properties of its solutions that are relevant from the point of view of traffic.

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Livres sur le sujet "Unbounded source"

Lui, Sha, and United States. National Aeronautics and Space Administration., eds. Sources of unbounded priority inversions in real-time systems and a comparative study of possible solutions. Research Institute for Computing and Information Systems, 1992.

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1947-, Lovins Amory B., and Zuckerman Seth, eds. Energy unbound: A fable for America's future. Sierra Club Books, 1986.

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Mead, Jeffrey B. Chains unbound: Slave emancipations in the town of Greenwich, Connecticut. Gateway Press, 1995.

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Unbound voices: A documentary history of Chinese women in San Francisco. University of California Press, 1999.

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Achilles Unbound: Multiformity and Tradition in the Homeric Epics. Center for Hellenic Studies, 2019.

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Yung, Judy. Unbound Voices: A Documentary History of Chinese Women in San Francisco. University of California Press, 1999.

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Chapitres de livres sur le sujet "Unbounded source"

Goertzel, Ben, and Joel Pitt. "Nine Ways to Bias Open-Source Artificial General Intelligence Toward Friendliness." In Intelligence Unbound. John Wiley & Sons, Inc, 2014. http://dx.doi.org/10.1002/9781118736302.ch4.

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Yang, En-hui, and Yunwei Jia. "Universal Lossless Coding of Sources with Large and Unbounded Alphabets." In Numbers, Information and Complexity. Springer US, 2000. http://dx.doi.org/10.1007/978-1-4757-6048-4_36.

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Weinberg, Alan M. "Italian Origins, Sources and Precedents: Prometheus Unbound." In Shelley’s Italian Experience. Palgrave Macmillan UK, 1991. http://dx.doi.org/10.1007/978-1-349-21649-9_5.

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"The earthquake source in unbounded media." In Elastic Wave Propagation and Generation in Seismology. Cambridge University Press, 2003. http://dx.doi.org/10.1017/cbo9780511610127.011.

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"Radiation from an Impulsive Source in an Unbounded Homogeneous Isotropic Solid." In North-Holland Series in Applied Mathematics and Mechanics. Elsevier, 1987. http://dx.doi.org/10.1016/b978-0-444-70294-4.50008-3.

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"Radiation from an Impulsive Source in an Unbounded Homogeneous Anisotropic Solid." In North-Holland Series in Applied Mathematics and Mechanics. Elsevier, 1987. http://dx.doi.org/10.1016/b978-0-444-70294-4.50010-1.

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Debnath, Pampa, and Arpan Deyasi. "Transmission Line and Its Implementation." In Contemporary Developments in High-Frequency Photonic Devices. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-8531-2.ch003.

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In unbounded media, wave propagation is supposed to be unguided. The existence of uniform plane wave is considered to be all through the space. Electromagnetic energy related with the wave stretched over a broad area. In TV and radio broadcasting, unbounded medium propagation of the wave is required. Here transmission of information is destined for one and all who may be interested. Another way of transmitting information is by guided media. Guided media acts to direct the transmission of energy from transmitter to receiver. Transmission lines are usually used in low frequency power distribution and in high frequency communications as well as in the ethernet and internet in computer networks. Two or more parallel conductors may be used to construct a transmission line, which connects source to a load. Typical transmission lines consist of coaxial line, waveguide, microstrip line, coplanar waveguide, etc. In this chapter, problems related with transmission lines are solved with the help of EM field theory and electric circuit theory.

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Goodman, Lenn E. "Holiness in Its Constellation." In The Holy One of Israel. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780190698478.003.0001.

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Chapter 1 discusses the notion that immanence and transcendence meet in the idea of God. Morally we find holiness in kindness (hesed), mirroring the generosity of God’s act of creation and the ongoing work of emergence, salient in evolution but dynamic throughout the cosmos. Intellectually holiness can be found, perhaps where least expected, in the sciences. For reason is our link with God, not cold but very much alive in the spontaneity and creativity that make it God’s image within us. Nature is no inert passivity but active and conative, a living theater in which God’s creativity tells its tale. And the transcendence visible in the liveliness that is God’s hallmark in nature can be emulated, as God commands: You shall be holy, for I the LORD thy God am holy (Leviticus 19:2). For God is the infinite Source of being, goodness, truth, and beauty. Every finite good points in the direction of its unbounded Source.

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"Ancient Sources Index." In Paul Unbound. SBL Press, 2022. http://dx.doi.org/10.2307/j.ctv2p7j64j.15.

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"Seismic point sources in unbounded homogeneous media." In Elastic Wave Propagation and Generation in Seismology. Cambridge University Press, 2003. http://dx.doi.org/10.1017/cbo9780511610127.010.

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Actes de conférences sur le sujet "Unbounded source"

Rinzema, Kees, Jaap J. ten Bosch, Hedzer A. Ferwerda, and Bernhard J. Hoenders. "Analytical close-to-source investigation for an isotropic point source in an unbounded, anisotropically scattering medium." In International Symposium on Biomedical Optics Europe '94, edited by Sigrid Avrillier, Britton Chance, Gerhard J. Mueller, Alexander V. Priezzhev, and Valery V. Tuchin. SPIE, 1995. http://dx.doi.org/10.1117/12.200839.

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Kudrin, Alexander, Evgeny Petrov, and Tatyana Zaboronkova. "Eigenfunction expansions of source-excited electromagnetic fields in cylindrically stratified unbounded gyrotropic media." In DAYS on DIFFRACTION 2006. IEEE, 2006. http://dx.doi.org/10.1109/dd.2006.348179.

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Lakkis, Issam. "Grid-Free Vortex Methods for Natural Convection in Two-Dimensional Domains." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-86103.

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Vortex methods for simulating natural convection of an ideal gas in unbounded two-dimensional domains are presented. In particular, the redistribution method for diffusion is extended to enable simulation of nonlinear diffusion of an ideal gas in isobaric conditions encountered in unbounded low-Mach number flows. We also address the problem of handling source terms in grid-free vortex methods and propose a fast, accurate, and physically motivated method for solving the associated inverse problems. Examples include generation of baroclinic vorticity in non-reacting buoyancy driven flows, and in addition, generation of internal energy and species in buoyant reacting flows. Accuracy and speed of the proposed algorithms for nonlinear diffusion and vorticity generation are investigated separately. Simulations of natural convection of a “thermal patch” for Grashof number ranging from to 1562.5 to 25000 are presented.

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Yang, Bingen, and Hang Shi. "A Root Locus Method for Stability Analysis of Heat Conduction in Multilayer Composite Solids." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-67881.

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Excessive heat generation within a body can cause unbounded temperature or thermal instability. In this work, a stability criterion is established for one-dimensional composite solids with internal heat generation at a rate proportional to their temperature. In the development, a spatial state formulation is used to derive a characteristic equation for system eigenvalues. A root locus analysis of the characteristic equation yields a stability criterion, by which an upper bound of heat source for thermal stability is obtained, and the gain of heat source is related to the number of unstable (positive) eigenvalues. The proposed stability test requires minimum numerical effort, does not require the information about system eigenvalues, and is applicable to various spatial distributions of heat source.

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Harwood, Adrian R. G., and Iain D. J. Dupère. "Numerical Evaluation of the Compact Green’s Function for the Solution of Acoustic Flows." In ASME 2012 Noise Control and Acoustics Division Conference at InterNoise 2012. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/ncad2012-0785.

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Due to the relatively tiny length scales involved, complex acoustic flows are not always suitable for traditional CFD codes. This paper develops a robust, semi-analytical numerical method for predicting sound fields based on the calculation of the compact Green’s function over a grid of source-observer positions. These calculations often involve singular functions, hence variations of the method are applied to several different 2D problems to investigate the impact of any singularities on the solution. The effect of grid point density and other parameters on execution time and accuracy are explored including the effects of approximating curved geometries using a number of straight lines. Comparison to known analytical solutions for the 2D problems is used to assess the accuracy of the method. For a typical application, we compute the far-field sound generated by a simple source in the vicinity of a compact, ‘2D’ fan blade in a duct. The current method demonstrates calculation of the compact Green’s function both accurately and robustly by avoiding the mapping from unbounded domains and the evaluation of potential models containing singularities. Both are seen as sources of error which have a widespread impact.

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Stevens, James W. "Intermittent Convective Heat Transfer for Ground-Source Heat Pump Design." In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-1307.

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Abstract An accurate estimate of the heat transfer from a buried pipe to the surrounding ground is essential for the design of the ground loop portion of a ground-source heat pump. Exact analytical solutions to this problem are complicated by the fact that heat pump systems rarely operate continuously. Complete numerical simulations of system designs can be carried out, but these are unwieldy and difficult to justify for initial scoping calculations, or for preliminary performance estimates. The purpose of this paper is to describe the development of simple algebraic correlations that can be used to approximate the intermittent overall heat transfer between a fluid flowing in an isolated buried pipe and the surrounding ground. The correlations described in this paper were drawn from results of a numerical finite-difference analysis of a fluid flowing intermittently in a single round pipe and exchanging heat with the surrounding ground. The two-dimensional analysis was carried out for ranges of the parameters of intermittence factor, thermal diffusivity of the ground, and convective heat transfer coefficient at the fluid-wall interface. The surrounding ground is unbounded for the purposes of the analysis. The dimensionless heat transfer can be easily related to the overall thermal resistance between the flowing fluid and the ground far from the buried pipe. It is found that the cycle average heat transfer is always lower for the intermittent case than for the continuous case, but that the average over just the active part of the cycle is always higher for any intermittent case than for the continuous case. The effect of the ground thermal diffusivity is largest when the heat transfer coefficient is large, and decreases with decreasing heat transfer coefficient. The range of heat transfer coefficients where isothermal wall conditions are approached is illustrated. Correlations for the operating average and cycle average total heat transfer are presented as functions of the thermal diffusivity, intermittence factor, and heat transfer coefficient.

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Song, Hao, and Longbin Tao. "Wave Interaction With an Infinite Long Horizontal Elliptical Cylinder." In ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2011. http://dx.doi.org/10.1115/omae2011-49829.

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Wave-structure interaction in ocean engineering is a major source of unsteady loading and vibration of offshore structures including platforms, risers and long cables. Many efforts focus on vertical structures in which solution procedures can usually be simplified in the plane of mean free surface as the variable in the direction of gravity can be separated. In this paper, wave interaction with an infinite long horizontal elliptical cylinder is solved by a semi-analytical method, namely, the scaled boundary finite-element method (SBFEM). The solution domain is divided into two bounded domains and two unbounded domains with parallel side-faces. The governing partial differential equation (Helmholtz equation) is weakened and transformed to ordinary matrix differential equations in radial direction and are then solved analytically by SBFEM.

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Bogy, D. B., and Lin Wu. "Air Bearing Models and Solutions for Sub-5 nm Spacings." In STLE/ASME 2001 International Joint Tribology Conference. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/trib-nano2001-101.

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Abstract When the flying height is below 5 nm, some physical phenomena that can be ignored for higher flying sliders need to be included in the modeling equations. Another challenging issue is the unavoidable asperity contact problem. It is known that zero spacing at asperities may cause some of the existing modified Reynolds equations to predict unphysical unbounded contact pressure singularities. In this paper we first review the source of these pressure singularities, showing which models have this problem and which do not. We also review here a new derivation of a compressible lubrication equation by using a different slip velocity boundary condition, in which additional slippage at the gas-solid interface due to pressure gradient is introduced. The new equation is free of any contact singularity [1]. Next we review our recent work on the non-negligible effect of the intermolecular forces on the slider’s flying attitude when the spacing is below 5 nm [2]. The additional force is attractive until the spacing is below about 0.1 nm for example and then it is repulsive. Finally we show the effect of these new force contributions on the flying attitude of a low flying slider.

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Gerhard, Tom, Michael Sturm, and Thomas H. Carolus. "Small Horizontal Axis Wind Turbine: Analytical Blade Design and Comparison With RANS-Prediction and First Experimental Data." In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-94158.

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State-of-the-art wind turbine performance prediction is mainly based on semi-analytical models, incorporating blade element momentum (BEM) analysis and empirical models. Full numerical simulation methods can yield the performance of a wind turbine without empirical assumptions. Inherent difficulties are the large computational domain required to capture all effects of the unbounded ambient flow field and the fact that the boundary layer on the blade may be transitional. A modified turbine design method in terms of the velocity triangles, Euler’s turbine equation and BEM is developed. Lift and drag coefficients are obtained from XFOIL, an open source 2D design and analysis tool for subcritical airfoils. A 3 m diameter horizontal axis wind turbine rotor was designed and manufactured. The flow field is predicted by means of a Reynolds-averaged Navier-Stokes simulation. Two turbulence models were utilized: (i) a standard k-ω-SST model, (ii) a laminar/turbulent transition model. The manufactured turbine is placed on the rooftop of the University of Siegen. Three wind anemometers and wind direction sensors are arranged around the turbine. The torque is derived from electric power and the rotational speed via a calibrated grid-connected generator. The agreement between the analytically and CFD-predicted kinematic quantities up- and downstream of the rotor disc is quite satisfactory. However, the blade section drag to lift ratio and hence the power coefficient vary with the turbulence model chosen. Moreover, the experimentally determined power coefficient is considerably lower as predicted by all methods. However, this conclusion is somewhat preliminary since the existing experimental data set needs to be extended.

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Rimmele, Thomas R., and Richard R. Radick. "Experimental Comparison of Two Approaches for Solar Wavefront Sensing." In Adaptive Optics. Optica Publishing Group, 1996. http://dx.doi.org/10.1364/adop.1996.athc.6.

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The Sun presents unusual problems for wavefront sensing. Unlike the nighttime sky, the Sun does not provide natural, high-contrast point sources, and creation of laser beacons bright enough to be visible against the solar disk poses major technical and operational problems. Small sunspots and pores can provide satisfactory substitutes for point sources, but these are available for only a tiny fraction of the solar disk. Wavefront sensing at arbitrary locations on the Sun requires a sensor capable of using the ubiquitous solar granulation as its target. Solar granulation is extended (its characteristic angular scale is about one arcsecond), unbounded (the angular extent of the composite granulation pattern greatly exceeds the isoplanatic angle), low contrast (a few percent), and both spatially and temporally variable (the typical evolution time scale is minutes). Conventional wavefront sensors such as shearing interferometers and simple Shack-Hartmann position sensors have difficulty dealing with targets having these characteristics, and therefore are not well-suited for general solar imaging.

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