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International Team Maps "Big Bang" of Bird Evolution（图）
International Team Maps Big Bang Bird Evolution
2014/12/30
The genomes of modern birds tell a story of how they emerged and evolved after the mass extinction that wiped out dinosaurs and almost everything else 66 million years ago. That story is now coming to...
New global maps detail human-caused ocean acidification（图）
ocean acidification global maps
2014/12/1
A team of scientists has published the most comprehensive picture yet of how acidity levels vary across the world’s oceans, providing a benchmark for years to come as enormous amounts of human-caused ...
Hawaii scientist maps, names Laniakea, our home supercluster of galaxies（图）
maps , names Laniakea galaxies
2014/9/12
University of Hawaiʻi at Mānoa astronomer R. Brent Tully, who recently shared the 2014 Gruber Cosmology Prize and the 2014 Victor Ambartsumian International Prize, has led an international team o...
Hawaii scientist maps, names Laniakea, our home supercluster of galaxies（图）
maps , names Laniakea galaxies
2014/9/12
University of Hawaiʻi at Mānoa astronomer R. Brent Tully, who recently shared the 2014 Gruber Cosmology Prize and the 2014 Victor Ambartsumian International Prize, has led an international team o...
EQUIVARIANT SCHRODINGER MAPS IN TWO SPATIAL ¨ DIMENSIONS: THE H2 TARGET
EQUIVARIANT SCHRODINGER MAPS TWO SPATIAL DIMENSIONS THE H2 TARGET
2014/4/3
We consider equivariant solutions for the Schr¨odinger map problem from R2+1to H2 with finite energy and show that they are global in time and scatter.
On f-bi-harmonic maps between Riemannian manifolds
f-bi-harmonic maps Riemannian manifolds
2018/4/19
Abstract: Both bi-harmonic map and $f$-harmonic map have nice physical motivation and applications. In this paper, by combination of these two harmonic maps, we introduce and study $f$-bi-harmonic map...
LONG TIME SOLUTIONS FOR WAVE MAPS WITH LARGE DATA
LONG TIME SOLUTIONS WAVE MAPS LARGE DATA
2018/4/19
For 2 + 1 dimensional wave maps with S2 as the target, we show that for all positive numbers T0 > 0 and E0 > 0, there exist Cauchy initial data with energy at least E0, so that the solution's life-spa...
A Saddle Point Approach to the Computation of Harmonic Maps
harmonic maps nonlinear constraints saddle point problem error estimates
2012/8/8
A Saddle Point Approach to the Computation of Harmonic Maps。
Infinitesimal Carleson property for weighted measures induced by analytic self-maps of the unit disk
Calderón-Zygmund decomposition Carleson measure weighted Bergman space
2012/6/21
We prove that, for every $\alpha > -1$, the pull-back measure $\phi ({\cal A}_\alpha)$ of the measure $d{\cal A}_\alpha (z) = (\alpha + 1) (1 - |z|^2)^\alpha \, d{\cal A} (z)$, where ${\cal A}$ is the...
An Alternative Approach to Generalised BV and the Application to Expanding Interval Maps
Generalised bounded variation transfer operator expanding map spectral gap
2012/6/21
We introduce a family of Banach spaces of measures, each containing the set of measures with density of bounded variation. These spaces are suitable for the study of weighted transfer operators of pie...
Word maps with small image in simple groups
Word maps with small image simple groups Group Theory
2012/6/25
We construct non-power words which have small image in SL(2; 22n) for each n. In particular, the corresponding word maps are non-surjective. We also use this to construct word maps whose values are pr...
Cannon-Thurston maps do not always exist
hyperbolic group Cannon–Thurston map Group Theory
2012/6/19
We construct an example of a hyperbolic group with a hyperbolic subgroup for which the Cannon-Thurston map does not exist. That is, inclusion does not induce a map of the boundaries.
Asymptotic expansion of smooth interval maps
Asymptotic expansion smooth interval maps Dynamical Systems
2012/4/16
We show that several different ways to quantify the asymptotic expansion of a non-degenerate smooth interval map coincide. A consequence is an extension to multimodal maps of the remarkable result of ...
Competitively Coupled Maps and Spatial Pattern Formation
Competitively Coupled Maps Spatial Pattern Formation
2012/4/26
Spatial pattern formation is a key feature of many natural systems in physics, chemistry and biology. The essential theoretical issue in understanding pattern formation is to explain how a spatially h...
Stability of Stationary Wave Maps from a Curved Background to a Sphere
Stability of Stationary Wave Maps Curved Background Sphere
2012/4/18
We study time and space equivariant wave maps from $M\times\RR\rightarrow S^2,$ where $M$ is diffeomorphic to a two dimensional sphere and admits an action of SO(2) by isometries. We assume that metri...