Results 11 to 20 of about 2,096,967 (227)

A Method of Lower and Upper Solutions for Control Problems and Application to a Model of Bone Marrow Transplantation

open access: yesInternational Journal of Applied Mathematics and Computer Science, 2023
A lower and upper solution method is introduced for control problems related to abstract operator equations. The method is illustrated on a control problem for the Lotka–Volterra model with seasonal harvesting and applied to a control problem of cell ...
Parajdi Lorand Gabriel   +2 more
doaj   +1 more source

Evolution of managerial problems from the perspective of management science

open access: yesBusiness: Theory and Practice, 2015
Managerial problems and the process of their solving play an important role both in the theory of management science and practice of organisations’ functioning.
Marek Szarucki
doaj   +1 more source

Quasars [PDF]

open access: yes, 1999
I review recent results for quasars and discuss how they are related to activity in galaxies. Topics included are studies of quasar host galaxies with HST; searches for quasars in the Hubble Deep Field; evolution of the quasar luminosity function; news ...
Osmer, Patrick S.
core   +2 more sources

The Challenge of Modelling Galactic Disks [PDF]

open access: yes, 2008
Detailed models of galactic disk formation and evolution require knowledge about the initial conditions under which disk galaxies form, the boundary conditions that affect their secular evolution and the micro-physical processes that drive the multi ...
Andreas Burkert, White
core   +1 more source

Entropy - Some Cosmological Questions Answered by Model of Expansive Nondecelerative Universe

open access: yesEntropy, 2003
: The paper summarizes the background of Expansive Nondecelerative Universe model and its potential to offer answers to some open cosmological questions related to entropy.
Miroslav Sukenik, Jozef Sima
doaj   +1 more source

Variable Decomposition for Large-Scale Constrained Optimization Problems Using a Grouping Genetic Algorithm

open access: yesMathematical and Computational Applications, 2022
Several real optimization problems are very difficult, and their optimal solutions cannot be found with a traditional method. Moreover, for some of these problems, the large number of decision variables is a major contributing factor to their complexity;
Guadalupe Carmona-Arroyo   +2 more
doaj   +1 more source

An evolution problem related to nonlinear 2d-magnetoelasticity

open access: yesApplied Mathematics Letters, 2018
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Priimenko, Viatcheslav   +1 more
openaire   +1 more source

A General Approach to Identification Problems and Applications

open access: yesBruno Pini Mathematical Analysis Seminar, 2014
An abstract method for dealing with identification problems related to evolution equations with multivalued operators or linear relations is described. Some possible applications are given.
Angelo Favini
doaj   +1 more source

A Hybrid Greedy Sine Cosine Algorithm with Differential Evolution for Global Optimization and Cylindricity Error Evaluation

open access: yesApplied Artificial Intelligence, 2021
Sine-cosine algorithm (SCA) has found a widespread application in various engineering optimization problems. However, SCA suffers from premature convergence and insufficient exploitation.
Qijun Li   +4 more
doaj   +1 more source

Extreme Value Statistics for Evolving Random Networks

open access: yesMathematics, 2023
Our objective is to survey recent results concerning the evolution of random networks and related extreme value statistics, which are a subject of interest due to numerous applications.
Natalia Markovich, Marijus Vaičiulis
doaj   +1 more source

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