Results 11 to 20 of about 1,601 (125)

Partially symmetric nonnegative rectangular tensors and copositive rectangular tensors

Journal of Industrial & Management Optimization, 2019
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Gu, Yining, Wu, Wei
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Singular values of a real rectangular tensor

Journal of Mathematical Analysis and Applications, 2010
Eigenvalues for real square tensors have been introduced and nice properties such as the Perron-Frobenius theorem for eigenvalues of nonnegative square tensors have been obtained in recent years. Real rectangular tensors arise from the strong ellipticity condition problem in solid mechanics and the entanglement problem in quantum physics. In this paper
Chang, K., Qi, L., Zhou, Guanglu
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On Non-Tensor Product Bivariate Fractal Interpolation Surfaces on Rectangular Grids [PDF]

Mathematics, 2020
Some years ago, several authors tried to construct fractal surfaces which pass through a given set of data points. They used bivariable functions on rectangular grids, but the resulting surfaces failed to be continuous. A method based on their work for generating fractal interpolation surfaces is presented.
Vasileios Drakopoulos, Polychronis Manousopoulos   +1 more
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Numerical Simulations of the Oscillating Second-Grade Fluid through a Rectangular Cross Duct with Fractional Constitution Relationship

Fractal and Fractional, 2022
An oscillating second-grade fluid through a rectangular cross duct is studied. A traditional integer time derivative in the kinematic tensors is substituted by a fractional operator that considers the memory characteristics.
Bo Zhang, Lin Liu, Siyu Chen, Sen Zhang, Lang Liu, Libo Feng, Jing Zhu, Jiangshan Zhang, Liancun Zheng   +8 more
doaj   +1 more source

Multi-scale study of diffusion in composite grain–pore systems based on particles random walk

Comptes Rendus. Mécanique, 2021
This paper studies diffusion processes at different scales in two-dimensional (2D) composite media (grain–pore porous micromodels). To model diffusion, this study uses the random walk particle tracking (RWPT) method based on 2D analytical solutions in ...
Oukili, Hamza, Ababou, Rachid, Debenest, Gérald, Noetinger, Benoît   +3 more
doaj   +1 more source

Two-dimensional Nye figures for hemitropic micropolar elastic solids [PDF]

Известия Саратовского университета. Новая серия: Математика. Механика. Информатика
The paper is devoted to a wide range of problems related to the two-dimensional Nye figures for micropolar continua. The method of two-dimensional matrix representation of fourth-rank tensors is well known from monographs on crystallography.
Murashkin, Evgenii Valeryevich, Radayev, Yuri Nickolaevich   +1 more
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Experimental and Numerical Investigation of Gas-Liquid Flow in a Rectangular Bubble Column with Centralized Aeration Flow Pattern

Chemical Engineering Transactions, 2013
Bubble columns are multiphase contact devices for mass and heat transfer, which are intensively used in different industrial areas. Flow and turbulence in these equipments are induced by bubble rise motion.
D.I. Sanchez-Forero, J.L. Silva Jr, M.K. Silva, J.C.S.C. Bastos, M. Mori   +4 more
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Technical note: Finite element formulations to map discrete fracture elements in three-dimensional groundwater models [PDF]

Hydrology and Earth System Sciences
Typically, in finite element groundwater models, fractures are represented by two-dimensional triangular or quadrilateral elements. When embedded in a three-dimensional space, the Jacobian matrix governing the transformation from the global three ...
R. de Rooij
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Ground Deformation and Seismic Fault Model of the M6.4 Durres (Albania) Nov. 26, 2019 Earthquake, Based on GNSS/INSAR Observations

Geosciences, 2020
We identify the source of the Mw = 6.4 earthquake that rocked north-central Albania on November 26, 2019 02:54 UTC. We use synthetic aperture radar interferograms tied to the time series of coordinates of two permanent Global Navigation Satellite System (
Athanassios Ganas, Panagiotis Elias, Pierre Briole, Flavio Cannavo, Sotirios Valkaniotis, Varvara Tsironi, Eleni I. Partheniou   +6 more
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Estimation of permeability tensor and dielectric permittivity of ferrites using a wave guide method under a dc magnetic field

EPJ Web of Conferences, 2014
Using a vector network analyzer equipped with a calibrated rectangular wave guide the electric permittivity and the element of the magnetic permeability tensor for Y3Fe5O12, ZnFe2O4 and NiFe2O4 are measured.
Tsiachristos I., Varouti E., Manios E., Stamopoulos D., Zervos T., Fikioris G., Lazarakis F., Alexandridis A., Pissas M.   +8 more
doaj   +1 more source