Results 71 to 80 of about 1,813,122 (293)
Creep Properties and Deformation Mechanism of Additively Manufactured NiAl‐CrMo Composites
Advanced Engineering Materials, EarlyView.Additively manufactured NiAl‐CrMo composites contain numerous interfaces and cell boundaries that control their creep response. At 700°C under high applied stress, creep is dominated by dislocation‐controlled power‐law mechanisms. At 800°C–900°C and lower stresses, creep is primarily diffusion‐controlled along cell boundaries.
Jan Vollhüter +9 more
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Estimating the operator exponential
Linear Algebra and its Applications, 1998 The paper deals with the strongly continuous semigroup \(V(t)\) such that the strong integral \(X=\int^{\infty}_{0}V(t)^{\ast}V(t)dt\) represents an everywhere defined and therefore bounded self-adjoint operator. Such a semigroup generalizes the exponential function \(V(t)=e^{At}\) with a square matrix \(A\).
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Advanced Engineering Materials, EarlyView.A novel workflow for investigating hydride vapor phase epitaxy for GaN bulk crystal growth is proposed. It combines Design of experiments (DoE) with physical simulations of mass transport and crystal growth kinetics, serving as an intermediate step between DoE and experiments.
J. Tomkovič +7 more
wiley +1 more source
On Uniform Exponential Trichotomy in Banach Spaces
Annals of the West University of Timisoara: Mathematics and Computer Science, 2014 In this paper we consider three concepts of uniform exponential trichotomy on the half-line in the general framework of evolution operators in Banach spaces.
Kovacs Monteola Ilona
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Boolean basis, formula size, and number of modal operators [PDF]
Logical Methods in Computer ScienceIs it possible to write significantly smaller formulae when using Boolean operators other than those of the De Morgan basis (and, or, not, and the constants)?
Christoph Berkholz +2 more
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Operator logarithms and exponentials
, 2007 Since Mclntosh's introduction of the 𝛨∞-calculus for sectorial operators, the topic has been studied by many authors. Haase has constructed a similar functional calculus for strip-type operators, and has also developed an abstract framework which unifies both of these examples and more. In this thesis we use this abstract functional calculus setting to
Clark, S, Clark, Stephen
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Structure of positive decompositions of exponential operators [PDF]
Physical Review E, 2005 The solution of many physical evolution equations can be expressed as an exponential of two or more operators acting on initial data. Accurate solutions can be systematically derived by decomposing the exponential in a product form. For time-reversible equations, such as the Hamilton or the Schrödinger equation, it is immaterial whether or not the ...
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On the Non-Hypercyclicity of Normal Operators, Their Exponentials, and Symmetric Operators [PDF]
Mathematics, 2019 We give a simple, straightforward proof of the non-hypercyclicity of an arbitrary (bounded or not) normal operator A in a complex Hilbert space as well as of the collection e t A t ≥ 0 of its exponentials, which, under a certain condition on the spectrum of A, coincides with the C 0 -semigroup generated by it.
Marat V. Markin, Edward S. Sichel
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Advanced Engineering Materials, EarlyView.Coarse‐grained (left) and atomistic (right) models of the shape memory polymer ESTANE ETE 75DT3 are shown schematically. The two representations bridge molecular detail and mesoscopic description. Both models capture shape memory behavior, linking segmental mobility and conformational relaxation of anisotropic chains to macroscopic recovery, and ...
Fathollah Varnik
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Advanced Engineering Materials, EarlyView.This review highlights advances in lightweight, lead‐free polymer nanocomposites for diagnostic X‐ray shielding. By linking filler chemistry, dispersion, architecture, and photon interaction mechanisms, it establishes structure–performance relationships guiding material design.
Aklilu G. Messele +2 more
wiley +1 more source