Results 251 to 260 of about 1,072,283 (301)

Forced and spontaneous symmetry breaking in cell polarization

Nature Computational Science, 2022
How does breaking the symmetry of an equation alter the symmetry of its solutions? Here, we systematically examine how reducing underlying symmetries from spherical to axisymmetric influences the dynamics of an archetypal model of cell polarization, a key process of biological spatial self-organization.
Pearson W. Miller, Daniel Fortunato, Cyrill Muratov, Leslie Greengard, Stanislav Shvartsman   +4 more
openaire   +2 more sources

Breaking covalent bonds using mechanical force, which bond breaks?

Molecular Physics, 2013
A constrained geometry optimisation scheme in combination with density functional theory is applied to probe the effect of an external force on a molecule. When the external force overcomes a critical value, one bond will break. In a polyatomic molecule, it is of special interest to see which bond breaks and why.
H. S. Smalø, E. Uggerud
openaire   +1 more source

Forced Symmetry-Breaking of Square Lattice Planforms

Journal of Dynamics and Differential Equations, 2006
The authors present a partial classification of the forced symmetry-breaking of square planforms both for the four- and eight-dimensional representations. The influence of small perturbations equivariant with respect to a certain subgroup of the \(D_4\dot{+}T^2\) group of square lattices is studied. It is shown the persistence of certain equilibria and
Parker, M. J., Gomes, M. G. M., Stewart, I. N.   +2 more
openaire   +1 more source

Forced symmetry breaking of homoclinic cycles

Nonlinearity, 1995
In the paper two equivariant equations (model equations for the Rayleigh-Bénard convection and a model for turbulent layers in wall regions with riblets) admitting structurally stable heteroclinic cycles are studied from the point of view of symmetry breaking. Sufficient conditions are formulated for the existence of various type of bifurcations from a
Sandstede, Björn, Scheel, Arnd
openaire   +2 more sources

Mechanical force induced DNA double-strand breaks: Ultrasound

2022
Since the application of ultrasound for clinical diagnosis and therapeutic purposes has been increased rapidly, the effects of exposure to ultrasound on DNA molecules were studied. In this chapter, we introduced various effects of DNA damages caused by different conditions of exposure of ultrasound.
Yue, Ma, Iwaki, Akiyama
openaire   +2 more sources

Breaking wave forces and velocity fields

Coastal Engineering, 1984
Abstract A new technique for measuring velocities under breaking wave crests using laser-doppler anemometry has been developed. Results may be obtained at positions up to 4 millimeters from the crest. A wave field is presented for a vertically fronted wave and comparison is made with an appropriate numerical study. The velocities obtained are far in
W.J. Easson, C.A. Greated
openaire   +1 more source

Forces Induced by Breaking Waves

1970
Chapter VII dealt principally with fluid-induced forces and where the fluid motion appeared in the form of surface gravity waves, only non-breaking waves were considered. In this chapter, our concern is with the forces induced by waves breaking on structures.
Bruce J. Muga, James F. Wilson
openaire   +1 more source

Forced Symmetry Breaking from O(3)

1992
Here we consider the flow near a manifold of equilibria of a specific orbit type of an O(3)-equivariant ordinary differential equation if we break the symmetry of the underlying system. This continues joint work with Mark Roberts [5] on cases of breaking SO(3)-equivariance. Applications to PDE’s are given in [6].
openaire   +2 more sources

Wind-Forced Shelf Break Upwelling

1983
An analysis of current meter and hydrographic data collected from an array of moorings situated at the shelf break off Nova Scotia is presented. In particular, the focus is on the ocean response to moderate (10 to 20 m s-1), transient winds of two or more days duration blowing parallel to the local bathymetry.
openaire   +1 more source

The Distribution of Breaking and Non-Breaking Wave Impact Forces

2009
Abstract : The magnitude of wave impact loads varies greatly, depending upon whether the wave is breaking, as well as on the wave height, length, steepness, and the geometry and immersion of the impacted structure. This report describes an experiment that was performed to characterize the distribution of breaking and non-breaking wave impact loads over
Susan Brewton, Don C. Walker, Ann Marie Powers, Anne M. Fullerton   +3 more
openaire   +1 more source