Results 31 to 40 of about 1,468,576 (139)

A New Graphical Representation of the Old Algebraic Structure

open access: yesJournal of Mathematics, 2023
The most recent advancements in algebra and graph theory enable us to ask a straightforward question: what practical use does this graph connected with a mathematical system have in the real world?
Muhammad Nadeem   +3 more
doaj   +1 more source

Detecting near-surface objects with seismic traveltime tomography:Experimentation at a test site [PDF]

open access: yesSongklanakarin Journal of Science and Technology (SJST), 2011
In environmental and engineering studies, detecting shallow buried objects using seismic reflection techniques iscommonly difficult when the acquisition geometry and frequency contents are limited and the heterogeneity of the subsurfaceis high.
Sawasdee Yordkayhun
doaj  

Review of seismic inverse scattering migration and inversion

open access: yes地球与行星物理论评, 2021
With the shifting toward deeper, geologically more complex, and more subtle hydrocarbon reservoirs than before, the exploration of oil and gas resources is becoming more and more difficult.
Weijian Mao, Wuqun Li, Wei Ouyang
doaj   +1 more source

Salt structures from inversion of residual gravity anomalies: application in Santos Basin, Brazil

open access: yesBrazilian Journal of Geology, 2019
The Santos Basin, with an area of about 350.000 km 2 , is the largest salt basin of the South Atlantic, and due to its high economic hydrocarbon potential, it is a recurrent theme in scientific studies.
Renata Regina Constantino   +3 more
doaj   +1 more source

Inverse scattering problem in turbulent magnetic fluctuations [PDF]

open access: yesAnnales Geophysicae, 2016
We apply a particular form of the inverse scattering theory to turbulent magnetic fluctuations in a plasma. In the present note we develop the theory, formulate the magnetic fluctuation problem in terms of its electrodynamic turbulent response ...
R. A. Treumann   +3 more
doaj   +1 more source

Distributive inverse semigroups and non-commutative Stone dualities [PDF]

open access: yes, 2013
We develop the theory of distributive inverse semigroups as the analogue of distributive lattices without top element and prove that they are in a duality with those etale groupoids having a spectral space of identities, where our spectral spaces are not
Lawson, Mark V, Lenz, Daniel H
core  

From random walk to single-file diffusion

open access: yes, 2005
We report an experimental study of diffusion in a quasi-one-dimensional (q1D) colloid suspension which behaves like a Tonks gas. The mean squared displacement as a function of time is described well with an ansatz encompassing a time regime that is both ...
Bianxiao Cui   +7 more
core   +1 more source

Creep theory inverse problem for non-work-hardening body

open access: yesVestnik Samarskogo Gosudarstvennogo Tehničeskogo Universiteta. Seriâ: Fiziko-Matematičeskie Nauki, 2014
The body formation by constant external forces in the conditions of the steady-state creep during set time problem is formulated and solved so that after removal of loadings the movements of points of a surface accepted preset values.
Igor Yu Tsvelodub
doaj   +1 more source

Analysis of computational efficiency for the solution of inverse kinematics problem of anthropomorphic robots using Gröbner bases theory

open access: yesInternational Journal of Advanced Robotic Systems, 2021
This article presents an analysis of computational efficiency to solve the inverse kinematics problem of anthropomorphic robots. Two approaches are investigated: the first approach uses Paul’s method applied to the matrix obtained by the Denavit ...
Sérgio Ricardo Xavier da Silva   +2 more
doaj   +1 more source

Direct and inverse spectral theorems for a class of canonical systems with two singular endpoints

open access: yes, 2015
Part I of this paper deals with two-dimensional canonical systems $y'(x)=yJH(x)y(x)$, $x\in(a,b)$, whose Hamiltonian $H$ is non-negative and locally integrable, and where Weyl's limit point case takes place at both endpoints $a$ and $b$. We investigate a
Langer, Matthias, Woracek, Harald
core   +2 more sources

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