Results 31 to 40 of about 139,385 (306)

Sonic hedgehog and Wnt: antagonists in morphogenesis but collaborators in axon guidance

open access: yesFrontiers in Cellular Neuroscience, 2013
As indicated by their name, morphogens were first identified for their role in the formation of tissues early in development. Secreted from a source, they spread through the tissue to form gradients by which they affect the differentiation of precursor ...
Evelyn Cecilia Avilés   +2 more
doaj   +1 more source

The Dependence of Repulsion Tennis Ball from the Air Pressure in it [PDF]

open access: yesJournal of Anthropology of Sport and Physical Education, 2018
The aim of this study is to determine the elastic (refl ective) properties of the tennis ball depending on the air pressure in it. The standard tennis ball was released on a fl at, solid surface from a height of nine meters, three times.
Dusko Bjelica   +2 more
doaj   +1 more source

Excitations in a superconducting Coulombic energy gap

open access: yesNature Communications, 2022
The fate of Yu-Shiba-Rusinov states in the presence of a strong Coulomb repulsion in a superconductor remains unknown. Here, the authors couple a quantum dot to a superconducting island with a tunable Coulomb repulsion, where they find a singlet many ...
Juan Carlos Estrada Saldaña   +6 more
doaj   +1 more source

INFLUENCE OF CONTACTOR CONTACT PRESSURE IN POWER CIRCUITS OF ELECTRIC STOCK ON THEIR PLASTIC DEFORMATION AND FUSING

open access: yesNauka ta progres transportu, 2017
Purpose. The work is aimed at conducting the study to obtain the results that will quantify the influence of contactor contact pressure in power circuits of electric stock on the highest current value Id, that does not cause plastic deformation of ...
O. Y. Baliichuk   +3 more
doaj   +1 more source

Regular repulsion vs. repulsion by degree.

open access: yes, 2014
Fruchterman-Rheingold layout on the left (regular repulsion) and ForceAtlas2 on the right (repulsion by degree). While the global scheme remains, poorly connected nodes are closer to highly connected nodes. ().
Mathieu Bastian (575795)   +3 more
core   +1 more source

Global Existence of Chemotaxis-Navier–Stokes System with Logistic Source on the Whole Space R2

open access: yesAxioms
In this article, we study the Cauchy problem of the chemotaxis-Navier–Stokes system with the consumption and production of chemosignals with a logistic source. The parameters χ≠0, ξ≠0, λ>0 and μ>0. The system is a model that involves double chemosignals;
Yuting Xu   +4 more
doaj   +1 more source

From Identity to Uniqueness: The Emergence of Increasingly Higher Levels of Hierarchy in the Process of the Matter Evolution

open access: yesEntropy, 2018
This article focuses on several factors of complification, which worked during the evolution of our Universe. During the early stages of such evolution up to the Recombination Era, it was laws of quantum mechanics; during the Dark Ages it was gravitation;
George Mikhailovsky
doaj   +1 more source

A longitudinal car-following risk assessment model based on risk field theory for autonomous vehicles

open access: yesInternational Journal of Transportation Science and Technology, 2021
This paper proposes a risk assessment method based on trajectory data which are used to quantify the risk faced by drivers for application in autonomous vehicles.
Bing Wu, Yan Yan, Daiheng Ni, Linbo Li
doaj   +1 more source

An analytical approach to estimating electrostatic repulsion between soil particles

open access: yes, 2022
The electrostatic repulsion between soil particles has an important effect on the stability of soil aggregates and soil water movement. However, the electrostatic repulsive pressure is traditionally quantified through a complicated numerical method.
Zhu, Yingcan   +9 more
core   +1 more source

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