Results 61 to 70 of about 2,945,859 (241)
Systematics in Metallicity Gradient Measurements I : Angular Resolution, Signal-to-Noise and Annuli Binning [PDF]
, 2013 With the rapid progress in metallicity gradient studies at high-redshift, it is imperative that we thoroughly understand the systematics in these measurements. This work investigates how the [NII]/Halpha ratio based metallicity gradients change with angular resolution, signal-to-noise (S/N), and annular binning parameters.
arxiv +1 more source
Enhanced Approach to Consistency in Gradient-Dependent Plasticity [PDF]
Advances in Structural Engineering, 2004 This note proposes a modification of gradient-dependent plasticity to improve convergence. In gradient-dependent plasticity, the consistency condition, which results in a differential equation with respect to the plastic multiplier, is solved simultaneously with the equilibrium equation.
Chen, G., Baker, Graham
openaire +3 more sources
Origin of Color Gradients in Elliptical Galaxies [PDF]
, 2000 The origin of color gradients in elliptical galaxies is examined by comparing model gradients with those observed in the Hubble Deep Field. The models are constructed so as to reproduce color gradients in local elliptical galaxies either by a metallicity gradient or by an age gradient.
arxiv +1 more source
Convergence of First-Order Methods for Constrained Nonconvex Optimization with Dependent Data [PDF]
International Conference on Machine Learning 2023, 2022 We focus on analyzing the classical stochastic projected gradient methods under a general dependent data sampling scheme for constrained smooth nonconvex optimization. We show the worst-case rate of convergence $\tilde{O}(t^{-1/4})$ and complexity $\tilde{O}(\varepsilon^{-4})$ for achieving an $\varepsilon$-near stationary point in terms of the norm of
arxiv
Limit theorems for gradient-dependent elastoplastic geomaterials
International Journal of Solids and Structures, 2007 AbstractIn this paper, the limit theorems proposed by Drucker and co-workers are reformulated to address a class of gradient-dependent elastoplastic geomaterials. The gradient effects are accounted for by incorporating strain gradients and their conjugate higher-order stresses into the constitutive descriptions. Gradient-dependent equilibrium equations
Zhao, Jidong +3 more
openaire +3 more sources
NeuroImage, 2023 The dependence of the diffusion MRI signal on the diffusion time carries signatures of restricted diffusion and exchange. Here we seek to highlight these signatures in the human brain by performing experiments using free gradient waveforms designed to be
Arthur Chakwizira +5 more
doaj
A New Framework for Variance-Reduced Hamiltonian Monte Carlo [PDF]
arXiv, 2021 We propose a new framework of variance-reduced Hamiltonian Monte Carlo (HMC) methods for sampling from an $L$-smooth and $m$-strongly log-concave distribution, based on a unified formulation of biased and unbiased variance reduction methods. We study the convergence properties for HMC with gradient estimators which satisfy the Mean-Squared-Error-Bias ...
arxiv
On a Neumann Problem with an Intrinsic Operator
AxiomsThis paper investigates the existence and location of solutions for a Neumann problem driven by a (p,q) Laplacian operator and with a reaction term that depends not only on the solution and its gradient but also incorporates an intrinsic operator, which ...
Dumitru Motreanu, Angela Sciammetta
doaj +1 more source
An approach with Lagrange identity of the mixed problem in theory of strain gradient thermoelasticity [PDF]
ITM Web of Conferences, 2020 In our paper we first define the mixed initial-boundary values problem in the theory of strain gradient thermoelasticity. With the help of an identity of Lagrange’s type, we then prove some theorems regarding the uniqueness of the solution of this mixed ...
Marin Marin
doaj +1 more source
Semilocal and hybrid meta-generalized gradient approximations based on the understanding of the kinetic-energy-density dependence. [PDF]
Journal of Chemical Physics, 2013 We present a global hybrid meta-generalized gradient approximation (meta-GGA) with three empirical parameters, as well as its underlying semilocal meta-GGA and a meta-GGA with only one empirical parameter.
Jianwei Sun +5 more
semanticscholar +1 more source