Results 231 to 240 of about 749,068 (264)
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Stereological analysis and modelling of gradient structures
Journal of Microscopy, 1999Gradient structures are inhomogeneous along a particular gradient direction but homogeneous perpendicular to that direction. Consequently, structural parameters such as volume fraction or surface area density are local characteristics which depend on the ‘vertical’ coordinate with respect to the ‘vertical’ gradient axis.Analogously, models for gradient
U. Hahn +4 more
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Turing Structures In The Presence Of Gradients
1993To understand recent experimental observations of localized Turing structures in the presence of gradients of concentrations, the patterns observable in two and three-dimensional homogeneous model reaction-diffusion systems are first reviewed. The influence of several types of ramps on the selection and orientation of these Turing structures are then ...
De Wit, Anne +2 more
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Structural Analysis in the Problems of Gradient Elasticity
Lobachevskii Journal of Mathematics, 2023zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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Controllable Growth of Gradient Porous Structures
Biomacromolecules, 2009Cocontinuous phase structures of immiscible polymers can be developed under appropriate melt-blending conditions. Because of the presence of interfacial tension, such cocontinuous structures start to coarsen when heated to a temperature higher than the melting/softening temperature of both phases.
Donggang, Yao, Wei, Zhang, Jack G, Zhou
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A structured gradient algorithm for adaptive beamforming
ICASSP-88., International Conference on Acoustics, Speech, and Signal Processing, 1989The constrained least-mean-square (LMS) algorithm uses a noisy estimate of the required gradient to adaptively estimate the weights of an optimal antenna array. The gradient is estimated by multiplying the array output with the array receiver outputs. An alternative scheme for estimating the required gradient is proposed in this paper.
Lal C. Godara, Doug A. Gray
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Gradient Structures for Flows of Concentrated Suspensions
2019In this work we investigate a two-phase model for concentrated suspensions. We construct a PDE formulation using a gradient flow structure featuring dissipative coupling between fluid and solid phase as well as different driving forces. Our construction is based on the concept of flow maps that also allows it to account for flows in moving domains with
Peschka, Dirk +4 more
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Gradient‐porous structure of silicon
physica status solidi c, 2007AbstractSilicon membranes with through pores have been manufactured based on silicon plates with a gradient‐porous structure (GPSi), in which the pore cross section and structure varies with depth. The obtained structure can serve a basis for the development of electrodes for solid polymer fuel cells.
V. Starkov, E. Gavrilin
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Structure Preserving Quaternion Biconjugate Gradient Method
SIAM Journal on Matrix Analysis and ApplicationszbMATH Open Web Interface contents unavailable due to conflicting licenses.
Tao Li 0047, Qing-Wen Wang 0001
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Gradient structures in cementitious materials
Cement and Concrete Composites, 2007Abstract A methodological approach to gradient structures in concrete technology is outlined in this paper. It is introduced by summarizing the approach to bulk structures, because of major similarities, and combined use in practice. The 3D structure assessment is specified for volume fraction, VV, specific surface area, SV, and total lineal ...
P. Stroeven, J. Hu
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Gradient-Based Structural Estimation
SSRN Electronic Journal, 2018In this paper, I show how gradient-based optimization methods can be used to estimate stochastic dynamic models in economics. By extending the state space to include all model parameters, I show that we need to solve the model only once to do structural estimation.
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