Results 11 to 20 of about 9,183,192 (276)
Programmable Chaotic Suspension Electrolysis for Scalable Manufacturing of Vacancy-Tunable Electrolytic MnO<sub>2</sub>. [PDF]
Adv Sci (Weinh)Programmable chaotic suspension electrolysis bridges laboratory synthesis and industrial manufacturing of high‐performance MnO2 cathodes. This scalable strategy enables tunable oxygen vacancies and a robust γ/β tunnel framework, delivering superior electrochemical performance and thermal stability.
Wu Z +16 more
europepmc +2 more sources
Hold Still, A Portrait of Our Nation Melanie March 2020
, 2021 Hold Still book A unique record of the project Cover: Johannah Churchill (feat Melanie's Mural back pages) Featuring an introduction from the Princess of Wales, this publication, supported by Co-op, includes the one hundred portraits selected for ...
Churchill, Johannah +1 more
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Melanie's Mural, National Portrait Gallery
, 2020 This incredible hand-painted mural of the portrait, Melanie, March 2020 by Johannah Churchill was on display in Manchester’s Northern quarter as part of the Hold Still community exhibition. This new nationwide exhibition, supported by the Co-op, has been
National Portrait Gallery +1 more
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Global phase portraits of the key pitchfork bifurcation [PDF]
SCIENTIA SINICA Mathematica, 2019 This paper deals with the following quadratic polynomial differential system$\frac{dx}{dt}=y^{2}-y-x,$ $\frac{dy}{dt}=x^{2}$ $-\,~\mu~x-y,$with parameter $\mu\in\mathbb{R}$, which is the key example for studying the pitchfork bifurcation of a singular point. We classify the global phase portraits in the Poincare disc of this system when $\mu$ varies.
Jaume, Llibre, Shimin, Li
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The Mathematical Model and Deep Learning Features Selection for Whorl Fingerprint Classifications
International Journal of Computational Intelligence Systems, 2021 In this paper, different classes of the whorl fingerprint are discussed. A general dynamical system with a parameter θ is created using differential equations to simulate these classes by varying the value of θ.
Ibrahim Jawarneh, Nesreen Alsharman
doaj +1 more source
Darboux polynomials and global phase portraits for the D2 vector field [PDF]
Journal of Mathematical Analysis and Applications, 2019 We study a vector field of R^3 equivariant under the D_2 symmetry group, called "the D_2 field" in the literature. We construct the complete list of Darboux polynomials for it, solving the partial differential equation defining them. We also use these polynomials to comment on its global qualitative behaviour.
Katsios, Kostas, Anastassiou, Stavros
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Fractional Punishment of Free Riders to Improve Cooperation in Optional Public Good Games
Games, 2021 Improving and maintaining cooperation are fundamental issues for any project to be time-persistent, and sanctioning free riders may be the most applied method to achieve it.
Rocio Botta +2 more
doaj +1 more source
GLOBAL PHASE PORTRAITS OF SOME REVERSIBLE CUBIC CENTERS WITH NONCOLLINEAR SINGULARITIES [PDF]
International Journal of Bifurcation and Chaos, 2013 The results in this paper show that the cubic vector fields ẋ = -y + M(x, y) - y(x2+ y2), ẏ = x + N(x, y) + x( x2+ y2), where M, N are quadratic homogeneous polynomials, having simultaneously a center at the origin and at infinity, have at least 61 and at most 68 topologically different phase portraits.
Magdalena Caubergh, Joan Torregrosa
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SCALE-INVARIANT AND WAVE NATURE OF THE HUBBLE PARAMETER
Eurasian Physical Technical Journal, 2021 The value of the global Hubble parameter corresponding to astrophysical observations was determined theoretically without using ʌСDM models. A nonlinear fractal model of the connection between the distance to the observed galaxy and its coordinate is ...
Z.Zh. Zhanabaev +2 more
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Degenerate Bogdanov–Takens bifurcations in a bulk viscous cosmology
European Physical Journal C: Particles and Fields, 2020 Using the dynamical system theory we show that the Friedmann–Robertson–Walker (FRW) cosmological model with bulk viscous fluid in the presence of cosmological constant is equivalent to a degenerate two dimensional Bogdanov–Takens normal form.
Asmaa Abdel Azim +2 more
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