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Relevant bibliographies by topics / Pseudo-density operator

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Academic literature on the topic 'Pseudo-density operator'

Author: Grafiati

Published: 14 March 2023

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Journal articles on the topic "Pseudo-density operator"

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XU, YE-JUN, JUN SONG, HONG-CHUN YUAN, HONG-YI FAN, and QIU-YU LIU. "QUANTIZATION SCHEME FOR FERMIONIC SYSTEM AND s-ORDERED OPERATOR EXPANSION FORMULA OF FERMIONIC DENSITY OPERATORS." Modern Physics Letters A 26, no. 11 (2011): 833–42. http://dx.doi.org/10.1142/s0217732311035213.

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We introduce the generalized fermionic Wigner operator with an s parameter. Based on its remarkable properties, we establish one-to-one mapping between fermion operators and their s-parametrized pseudo-classical correspondence, which may involve fermionic Weyl pseudo-classical correspondence, P-representation and Q-representation in a unified way. Furthermore, starting with the projector of the fermionic coherent state, we obtain the s-ordered operator expansion formula of fermionic density operators, which includes normally ordered, antinormally ordered and Weyl ordered product of operators f

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Liu, Junfeng, and Litan Yan. "On a nonlinear stochastic pseudo-differential equation driven by fractional noise." Stochastics and Dynamics 18, no. 01 (2017): 1850002. http://dx.doi.org/10.1142/s0219493718500028.

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In this paper, we study the existence, uniqueness and Hölder regularity of the solution to a class of nonlinear stochastic pseudo-differential equation of the following form [Formula: see text] where [Formula: see text] is a pseudo-differential operator with negative definite symbol of variable order which generates a stable-like process with transition density, the coefficient [Formula: see text] is a measurable function, and [Formula: see text] is a double-parameter fractional noise. In addition, the existence and Gaussian type estimates for the density of the mild solution are proved via Ma

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Hanyga, Andrzej, and Richard L. Magin. "A new anisotropic fractional model of diffusion suitable for applications of diffusion tensor imaging in biological tissues." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 470, no. 2170 (2014): 20140319. http://dx.doi.org/10.1098/rspa.2014.0319.

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An anomalous anisotropic diffusion equation is constructed in which the order of the spatial pseudo-differential operator is generalized to be distributed with a directionally dependent distribution. A time fractional version of this equation is also considered. First, it is proved that the equation is positivity-preserving and properly normalized. Second, the existence of a smooth Green's function solution is proved. Finally, an expression for the diffusive flux density for this new fractional order process is calculated. This approach may find utility in modelling diffusion tensor imaging da

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Atallah-Baraket, Amel, and Maryem Trabelsi. "Analysis of the energy decay of a viscoelasticity type equation." Analele Universitatii "Ovidius" Constanta - Seria Matematica 24, no. 3 (2016): 21–45. http://dx.doi.org/10.1515/auom-2016-0046.

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AbstractIn this paper, we study the evolution of the energy density of a sequence of solutions of a problem related to a viscoelasticity model where the viscosity term is a pseudo-differential operator of order 2α with α ∈ (0, 1). We calculate the weak limit of the energy density in terms of microlocal defect measures and under special assumption we prove that the viscosity term prevents propagation of concentration and oscillation effects contrary to what happens in the wave equation.

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Allen, Blake J., Edward R. Mansell, David C. Dowell, and Wiebke Deierling. "Assimilation of Pseudo-GLM Data Using the Ensemble Kalman Filter." Monthly Weather Review 144, no. 9 (2016): 3465–86. http://dx.doi.org/10.1175/mwr-d-16-0117.1.

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Total lightning observations that will be available from the GOES-R Geostationary Lightning Mapper (GLM) have the potential to be useful in the initialization of convection-resolving numerical weather models, particularly in areas where other types of convective-scale observations are sparse or nonexistent. This study used the ensemble Kalman filter (EnKF) to assimilate real-data pseudo-GLM flash extent density (FED) observations at convection-resolving scale for a nonsevere multicell storm case (6 June 2000) and a tornadic supercell case (8 May 2003). For each case, pseudo-GLM FED observation

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Mamalyha, Kh V., and M. M. Osypchuk. "On single-layer potentials for a class of pseudo-differential equations related to linear transformations of a symmetric $\alpha$-stable stochastic process." Carpathian Mathematical Publications 11, no. 2 (2019): 350–60. http://dx.doi.org/10.15330/cmp.11.2.350-360.

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In this article an arbitrary invertible linear transformations of a symmetric $\alpha$-stable stochastic process in $d$-dimensional Euclidean space $\mathbb{R}^d$ are investigated. The result of such transformation is a Markov process in $\mathbb{R}^d$ whose generator is the pseudo-differential operator defined by its symbol $(-(Q\xi,\xi)^{\alpha/2})_{\xi\in\mathbb{R}^d}$ with some symmetric positive definite $d\times d$-matrix $Q$ and fixed exponent $\alpha\in(1,2)$. The transition probability density of this process is the fundamental solution of some parabolic pseudo-differential equation.

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Mamalyha, Kh V., and M. M. Osypchuk. "Properties of single layer potentials for a pseudo- differential equation related to a linear transformation of a rotationally invariant stable stochastic process." Matematychni Studii 55, no. 1 (2021): 94–106. http://dx.doi.org/10.30970/ms.55.1.94-106.

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This article is aimed at determining existence conditions of single layer potentials for pseudo-differential equations related to some linear transformations of a rotationally invariant stable stochastic process in a multidimensional Euclidean space and investigating their properties as well. The carrier surface of the potential is smooth enough. In this article, we consider two main cases: the first, when this surface is bounded and closed; the second, when it is unbounded, but could be presented by an explicit equation in some coordinate system. The density of this potential is a continuous

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Wang, Yuwei, Liangguo Dong, Yuzhu Liu, and Jizhong Yang. "2D frequency-domain elastic full-waveform inversion using the block-diagonal pseudo-Hessian approximation." GEOPHYSICS 81, no. 5 (2016): R247—R259. http://dx.doi.org/10.1190/geo2015-0678.1.

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Elastic full-waveform inversion (EFWI) of multicomponent seismic data is a powerful tool for estimating the subsurface elastic parameters with high accuracy. However, the trade-offs between multiple parameters increase the nonlinearity of EFWI. Although the conventional diagonal-approximate Hessian matrix describes the illumination and limited bandwidth effects, it ignores the trade-off effects and decreases the convergence rate of EFWI. We have developed a block-diagonal pseudo-Hessian operator for 2D frequency-domain EFWI to take into account the approximate trade-offs among the P-wave (comp

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Murguía-Romero, Gabriela, Angel Sánchez, and Ricardo Zavaleta-Madrid. "Electromagnetic Properties in Multilayer Graphene within the Ritus Formalism: Transverse Electrical Conductivity." Advances in Science and Technology 98 (October 2016): 125–30. http://dx.doi.org/10.4028/www.scientific.net/ast.98.125.

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Within the framework of the Quantum Field Theory, we discuss how to study electromagnetic properties of a multilayer graphene sample in the presence of electric and magnetic fields, both perpendicular to the graphene planes. We deal with the multilayer system by taking into account the quantum mechanical supersymmetric property of the monolayer Hamiltonian. We solve the Dirac equation for the graphene charge carriers by using the Ritus formalism. This formalism consists in the diagonalization of the operator with and the Dirac gamma matrices which contain information about the pseudo-spin. We

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Lee, Hyun Geun. "Numerical Simulation of Pattern Formation on Surfaces Using an Efficient Linear Second-Order Method." Symmetry 11, no. 8 (2019): 1010. http://dx.doi.org/10.3390/sym11081010.

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We present an efficient linear second-order method for a Swift–Hohenberg (SH) type of a partial differential equation having quadratic-cubic nonlinearity on surfaces to simulate pattern formation on surfaces numerically. The equation is symmetric under a change of sign of the density field if there is no quadratic nonlinearity. We introduce a narrow band neighborhood of a surface and extend the equation on the surface to the narrow band domain. By applying a pseudo-Neumann boundary condition through the closest point, the Laplace–Beltrami operator can be replaced by the standard Laplacian oper

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Dissertations / Theses on the topic "Pseudo-density operator"

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Hughes, David J. J. "The integrated density of states for periodic elliptic pseudo-differential operators in dimension one." Thesis, University of Sussex, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.410366.

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In this thesis, we study an elliptic, one dimensional, pseudo-differential operator, with homogeneous symbol, which is perturbed by a lower order, symmetric, pseudo-differential operator, whose symbol is periodic, magnified by a real coupling constant. The main goal is to prove that such an operator generates a complete asymptotic expansion of the integrated density of states for large energies and an arbitrary large coupling constant. The Floquet theory, which may be viewed as the foundation of the study of periodic operators, is rigorously developed for pseudo-differential operators in arbit

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Conference papers on the topic "Pseudo-density operator"

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Farshad, M., and H. Chauris. "Sparsity-Promoting Pseudo-Inverse Born Operator in the Presence of Density Variations: An Efficient MultiParameter Imaging Tool." In 82nd EAGE Annual Conference & Exhibition. European Association of Geoscientists & Engineers, 2020. http://dx.doi.org/10.3997/2214-4609.202011366.

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Saha, Sankhajit, Prajit Chakrabarti, Johannes Vossen, Sourav Mitra, and Tuhin Podder. "Proactive Decision-Making Through Real-Time Geomechanical Support Leveraging Drilling a Long Horizontal Section Through a Tight Unconventional Reservoir of an Oil and Gas Field: Middle East." In SPE Middle East Oil & Gas Show and Conference. SPE, 2021. http://dx.doi.org/10.2118/204776-ms.

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Abstract This paper discusses the Integrated Role of Geomechanics and Drilling Fluids Design for drilling a well oriented towards the minimum horizontal stress direction in a depleted, yet highly stressed and complex clastic reservoir. There are multiple challenges related to such a well that need to be addressed during the planning phase. In this case, the well needs to be drilled towards the minimum horizontal stress direction (Shmin) to benefit multi-stage hydraulic fracturing. At the same time, the most prominent challenge is that this well orientation is more prone to wellbore failure and

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Luo, Zhen, Eing Yee Yeoh, Xiaosong Chen, Linsen Li, and Mian Xing. "Fuel Management Strategy of LBE-Cooled Fast Reactor BLESS-D." In 2022 29th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/icone29-90443.

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Abstract As one of the six nuclear reactor candidates selected by the Generation IV International Forum (GIF), lead-cooled fast reactor (LFR) has become one of the most promising concepts and attracted more attention from the institutes. A lead-bismuth eutectic (LBE) cooled fast reactor called BLESS-D has been proposed by State Power Investment Corporation Research Institute of China. The fuel management is critical to reactor design because it affects reactor economics. Although the research on fuel management of PWR has matured, there are few studies on fuel management for LFR. Fuel manageme

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Xu, Yuting, Zhifang Wu, and Qiang Wang. "A Study on Radiation Imaging Mechanism and Characteristics in Different Inspection Systems." In 2021 28th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/icone28-66127.

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Abstract Radiation imaging, as a key issue in nuclear technology, has received considerable attention in the industry. It is widely used in nuclear medicine, Customs supervision, and many other areas. The objective of this investigation is to get insight into the principle, operation characteristics and image characteristics of radiation imaging. In this paper, an investigation on radiation imaging is conducted on three main inspection systems for Customs supervision, including small X-ray inspection machine, CT baggage inspection system, and large container inspection system. The principle, o

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Yang, Dong, Zhi Shen, Xin Nie, Wanyu Liu, Fengjun Wang, and Ying Huang. "Hydraulic Resistance of Subcritical and Supercritical Water Flowing in a Rifled Tube." In ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-65597.

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Large capacity supercritical boiler is at the leading edge of efficiency boost for thermal power plant. Water wall design is a key issue for a supercritical boiler. To ensure successful design and safe operation of water wall, studying hydraulic resistance of water is significant. Considerable work on frictional pressure drop of gas-liquid two-phase flow in tubes has been done and various correlations have been proposed to predict it. However, these correlations are restricted to particular rib geometries and flow conditions. Because of significant variations in thermo physical properties near

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Amalfi, Raffaele L., Cong H. Hoang, Ryan Enright, Filippo Cataldo, Jackson B. Marcinichen, and John R. Thome. "Operational Map and Thermal Performance of a Thermosyphon Cooling System for Compact Servers." In ASME 2021 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/ipack2021-72612.

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Abstract This paper advances the state-of-the-art in novel passive two-phase systems for more efficient cooling of datacenters and telecom central offices compared to the traditional air-based cooling solutions (e.g. aisle-based containment systems). The proposed passive two-phase technology uses numerous server-level thermosyphons to dissipate the heat generated by critical components, such as central processing units, accelerators, etc., with the flexibility of selecting the rack-level and room-level cooling elements depending on the deployment scenarios. The main goal of this paper is to ex

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Collison, Michael J., Peter X. L. Harley, and Domenico di Cugno. "Experimental and Numerical Investigation of Transition Effects on a Low Reynolds Number Airfoil." In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-63294.

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Low speed, small scale turbomachinery operates at low Reynolds number with transition phenomena occurring. In small consumer product applications, high efficiency and low noise are key performance metrics. Transition behaviour will partly determine the state of the boundary layer at the trailing edge; whether it is laminar, turbulent or separated impacts aerodynamic and acoustic performance. This study aimed to evaluate a commercially available CFD transition model on a low Reynolds number Eppler E387 airfoil and identify whether it was able to correctly model the boundary layer transition, an

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Voigt, Torsten, Peter Habisreuther, and Nikolaos Zarzalis. "Simulation of Vorticity Driven Flame Instability Using a Flame Surface Density Approach Including Markstein Number Effects." In ASME Turbo Expo 2009: Power for Land, Sea, and Air. ASMEDC, 2009. http://dx.doi.org/10.1115/gt2009-59331.

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The combustion induced and vorticity driven instability behaviour of a lean flame within a premixed combustion system under typical gas turbine conditions is investigated numerically. Over a wide range of operation conditions, the flame is stabilised by the well known mechanisms of premixed confined combustion systems interacting with a turbulent swirled flow field. However, the behaviour of the flame changes drastically just as a critical equivalence ratio is reached: the flame moves upstream close to the rotational axis at positions of originally highest downstream velocities. This flashback

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