Results 1 to 10 of about 144,761 (99)

Global configurations of singularities for quadratic differential systems with exactly two finite singularities of total multiplicity four [PDF]

Electronic Journal of Qualitative Theory of Differential Equations, 2014
In this article we obtain the geometric classification of singularities, finite and infinite, for the three subclasses of quadratic differential systems with $m_f=4$ possessing exactly two finite singularities, namely: (i) systems with two double complex
Joan Artés, Jaume Llibre, Alex Rezende, Dana Schlomiuk, Nicolae Vulpe   +4 more
doaj   +6 more sources

The Fundamental Lepage Form in Two Independent Variables: A Generalization Using Order-Reducibility

Mathematics, 2022
A second-order generalization of the fundamental Lepage form of geometric calculus of variations over fibered manifolds with 2-dimensional base is described by means of insisting on (i) an equivalence relation “Lepage differential 2-form is closed if and
Zbyněk Urban, Jana Volná
doaj   +1 more source

Functions’ algebra in nonlinear control: computational aspects and software; pp. 89–107 [PDF]

Proceedings of the Estonian Academy of Sciences, 2017
The paper describes the Mathematica-based software for studying nonlinear control systems. The software relies on an algebraic method, called functions’ algebra.
Juri Belikov, Arvo Kaldmäe, Vadim Kaparin, Ülle Kotta, Alexey Ye. Shumsky, Maris Tõnso, Alexey Zhirabok   +6 more
doaj   +1 more source

Non-Verbal Languages of Consciousness: Representation of Subjective Attitude through Color, Form and Direct Assessment

Экспериментальная психология, 2022
Since the end of the last century, the problem of consciousness has come to the fore in the world science. The unresolved nature of this problem until today is connected with the insurmountability of the “border” between phenomenal and ...
G.V. Akopov, L.S. Akopyan, A.V. Belous, A.V. Kaptsov   +3 more
doaj   +1 more source

The geometry of RN-AdS fluids

Physics Letters B, 2020
We establish the parameter space geometry of a fluid system characterized by two constants, whose equation of state mimics that of the RN-AdS black hole. We call this the RN-AdS fluid.
Joy Das Bairagya, Kunal Pal, Kuntal Pal, Tapobrata Sarkar   +3 more
doaj   +1 more source

Novel Ring Compression Test Method to Determine the Stress-Strain Relations and Mechanical Properties of Metallic Materials

Chinese Journal of Mechanical Engineering, 2021
Although there are methods for testing the stress-strain relation and strength, which are the most fundamental and important properties of metallic materials, their application to small-volume materials and tube components is limited.
Guangzhao Han, Lixun Cai, Chen Bao, Bo Liang, Yang Lyu, Maobo Huang, Xiaokun Liu   +6 more
doaj   +1 more source

Zeta functions and Blow-Nash equivalence [PDF]

, 2005
We propose a refinement of the notion of blow-Nash equivalence between Nash function germs, which is an analog in the Nash setting of the blow-analytic equivalence defined by T.-C. Kuo. The new definition is more natural and geometric.
Fichou, Goulwen
core   +3 more sources

Global configurations of singularities for quadratic differential systems with exactly three finite singularities of total multiplicity four

Electronic Journal of Qualitative Theory of Differential Equations, 2015
In this article we obtain the geometric classification of singularities, finite and infinite, for the two subclasses of quadratic differential systems with total finite multiplicity $m_f=4$ possessing exactly three finite singularities, namely: systems ...
Joan Artés, Jaume Llibre, Dana Schlomiuk, Nicolae Vulpe   +3 more
doaj   +1 more source

Rough Neutrosophic Multisets Geometric Aggregation Operator with Entropy Weight Combined Roughness Dice Similarity Measure and Its Application [PDF]

ITM Web of Conferences
Rough neutrosophic multisets (RNM) is an uncertainty set theory generalized from the rough neutrosophic set. In the same equivalence relation, the universal set is a neutrosophic multisets with boundary regions involving lower and upper approximation. To
Alias Suriana, Mohamad Daud, Shuib Adibah, Mustapha Norzieha, Md Yasin Roliza, Mohd Yusoff Nazhatul Sahima, Broumi Said   +6 more
doaj   +1 more source

First integrals and phase portraits of planar polynomial differential cubic systems with invariant straight lines of total multiplicity eight

Electronic Journal of Qualitative Theory of Differential Equations, 2017
In the article [C. Bujac, J. Llibre, N. Vulpe, Qual. Theory Dyn. Syst. 15(2016), 327–348] for the family of cubic differential systems with the maximum number of invariant straight lines, i.e.
Cristina Bujac, Nicolae Vulpe
doaj   +1 more source