Results 21 to 30 of about 3,840,280 (339)

AN APLICATION FOR THE SELECTION AND SIZING OF CONTROL VALVE FOR CONTROL LOOP [PDF]

open access: yesRomanian Journal of Petroleum & Gas Technology, 2023
The paper presents the research of the author in developing an application for sizing and selection of control valves for typical process control applications.
Cristina Popa
doaj   +1 more source

Numerical results from large N reduced QCD_2 [PDF]

open access: yes, 2002
Some results in QCD_2 at large N are presented using the reduced model on the lattice. Overlap fermions are used to compute meson propagators.Comment: 3 pages, contribution to Lattice 2002 ...
Bhanot   +8 more
core   +2 more sources

A Seven-Parameter Spectral/hp Finite Element Model for the Linear Vibration Analysis of Functionally Graded Shells with Nonuniform Thickness

open access: yesApplied Sciences, 2023
This contribution presents a finite element shell model capable of performing linear vibration analyses of shell-type structures made of functionally graded material (FGM). The model is based on the seven-parameter spectral/hp finite element formulation,
Carlos Enrique Valencia Murillo   +3 more
doaj   +1 more source

A Globally Convergence Spectral Conjugate Gradient Method for Solving Unconstrained Optimization Problems [PDF]

open access: yesAl-Rafidain Journal of Computer Sciences and Mathematics, 2013
In this paper, a modified spectral conjugate gradient method for solving unconstrained optimization problems is studied, which has sufficient descent direction and global convergence with an inexact line searches. The Fletcher-Reeves restarting criterion
Basim Hassan
doaj   +1 more source

Closed‐form expression for coverage and average rate of 2D and 3D cellular networks

open access: yesElectronics Letters, 2019
This Letter proposes a novel tractable solution for the average rate in cellular networks. Specifically, the authors derive a closed‐form solution based on bipolar point processes to simplify the computational complexity, which may be conveniently ...
Hui Zhang, Luan Li, Dan Keun Sung
doaj   +1 more source

A New Algorithms in Mixed Integer Programming Problems [PDF]

open access: yesAl-Rafidain Journal of Computer Sciences and Mathematics, 2010
In this paper we have studied two new algorithms for solving mixed IPP. In the 1st algorithm we have investigated a new short technique for searching to the efficient cut in the standard cutting plane procedure to obtain the same optimal solution by ...
Basim Hassan, Abbas Al-Bayati
doaj   +1 more source

Single-W Production and Fermion-Loop Scheme: Numerical Results [PDF]

open access: yes, 2000
The single-W production mechanism is synonymous to the electron-positron annihilation into electron, neutrino and a W boson with the outgoing electron lost in a small cone around the beam direction.
Acciarri   +39 more
core   +3 more sources

Relativistic and Newtonian core-shell models: analytical and numerical results [PDF]

open access: yes, 1998
We make a detailed analysis of Newtonian as well as relativistic core-shell models recently proposed to describe a black hole or neutron star surrounded by shells of matter, and in a seminal sense also galaxies, supernovae and star remnants since there ...
Arnaboldi M.   +23 more
core   +3 more sources

Mathematical Modeling of COVID-19 with Vaccination Using Fractional Derivative: A Case Study

open access: yesFractal and Fractional, 2023
Vaccination against any infectious disease is considered to be an effective way of controlling it. This paper studies a fractional order model with vaccine efficacy and waning immunity.
Tian-Chuan Sun   +6 more
doaj   +1 more source

Mathematical modeling of the source and environment response for the equation of geoelectrics

open access: yesҚарағанды университетінің хабаршысы. Математика сериясы, 2019
In this paper an algorithm is proposed for determining the source of excitation of electromagnetic waves emitted by the Ground - penetrating radar (GPR) device as a function of time.
K.T. Iskakov   +4 more
doaj   +1 more source

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