Results 21 to 30 of about 3,531 (298)
Second integral generalization of the Crocco invariant for 3D flows behind detached bow shock wave [PDF]
Vestnik Samarskogo Gosudarstvennogo Tehničeskogo Universiteta. Seriâ: Fiziko-Matematičeskie Nauki, 2021 Stationary flows of an ideal gas behind the detached bow shock are investigated in the general 3D case. The well-known integral invariant (V.N.Golubkin, G.B.Sizykh, 2019), generalizing the axisymmetric invariant of (L.Crocco, 1937) to asymmetric flows ...
Grigory Sizykh
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Duality Results for a Class of Constrained Robust Nonlinear Optimization Problems
Mathematics, 2022 In this paper, we establish various results of duality for a new class of constrained robust nonlinear optimization problems. For this new class of problems, involving functionals of (path-independent) curvilinear integral type and mixed constraints ...
Savin Treanţă, Tareq Saeed
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Abrupt Change Detection Method Based on Features of Lorenz Trajectories
Atmosphere, 2021 This paper presents a definition of bifurcation-type abrupt changes based on the bifurcation features of Lorenz trajectories. These abrupt changes are the result of the transition behavior of dynamical system trajectories among different equilibrium ...
Chaojiu Da +4 more
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On Some Constrained Optimization Problems
Mathematics, 2022 By using appropriate methods of variational analysis, the necessary conditions of optimality are established for new classes of constrained optimization problems involving multiple and curvilinear integral functionals.
Savin Treanţă +3 more
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Optimality for Control Problem with PDEs of Second-Order as Constraints
Mathematics, 2022 This paper deals with a class of second-order partial differential equation (in short, PDE) constrained optimal control problems. More specifically, by using appropriate variational techniques, we state necessary conditions of optimality associated with ...
Savin Treanţă +2 more
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Results on the Existence of Solutions Associated with Some Weak Vector Variational Inequalities
Fractal and Fractional, 2022 In this paper, by considering the notions of the invex set, Fréchet differentiability, invexity and pseudoinvexity for the involved functionals of curvilinear integral type, we establish some relations between the solutions of a class of weak vector ...
Savin Treanţă
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On a Class of Isoperimetric Constrained Controlled Optimization Problems
Axioms, 2021 In this paper, we investigate the Lagrange dynamics generated by a class of isoperimetric constrained controlled optimization problems involving second-order partial derivatives and boundary conditions.
Savin Treanţă
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Supercomputer multiscale modeling of composite structures strength [PDF]
E3S Web of Conferences, 2023 A method for multiscale supercomputer calculations of the composite structures strength has been developed. A feature of the proposed methodology is of division of the solution algorithm into 2 parts: solving problems at the micro level (in turn, these ...
Dimitrienko Y. +7 more
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Mathematics, 2022 This paper comprehensively reviews the nonlinear dynamics given by some classes of constrained control problems which involve second-order partial derivatives.
Savin Treanţă
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Geometric interpretation of integrals
Lietuvos Matematikos Rinkinys, 2010 There are considered the geometric interpretation of curvilinear intels of first and second type. The integrals first type are interpretated like area of cilindric figure, the integrals of second type – like area of projection of the same cilindric ...
Gintaras Puriuškis
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