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Academy of Mathematics and Systems Science, CAS Colloquia & Seminars：Liouville Properties on gradient shrinking Ricci solitons with constant scalar curvature
常标量 曲率梯度收缩 Ricci孤子 Liouville性质
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2023/11/13
In this talk we show that bounded harmonic functions are constant on gradient shrinking Ricci solitons with CSC by frequency function method. As an application, we show that the space of harmonic func...
High carbon dioxide can create 'shrinking stems' in marshes（图）
High carbon dioxide shrinking stems marshes
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2019/10/18
For most plants, carbon dioxide acts like a steroid: the more they take in, the bigger they get. But in a new study, scientists at the Smithsonian Environmental Research Center, Villanova University a...
The Giant Panda's Habitat Is Shrinking And Becoming More Fragmented（图）
Giant Panda Habitat Shrinking More Fragmented
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2017/10/24
A study by Chinese and U.S. scientists finds that while populations of the iconic giant panda have increased recently, the species’ habitat still covers less area and is more fragmented than when it w...
Colorado River Flows to Keep Shrinking as Climate Warms
Colorado River Flows Keep Shrinking Climate Warms
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2017/3/14
Warming in the 21st century reduced Colorado River flows by at least 0.5 million acre-feet, about the amount of water used by 2 million people for one year, according to new research from the Uni...
Climate Change:Greenland Melting Tied to Shrinking Arctic Sea Ice
Climate Change Greenland Melting Shrinking Arctic Sea Ice
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2016/4/13
Vanishing Arctic sea ice. Dogged weather systems over Greenland. Far-flung surface ice melting on the massive island.These dramatic trends and global sea-level rise are linked, according to a study co...
Shrinking Trees
Shrinking Trees
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2015/8/21
Tree-based models provide an alternative to linear models for classification and regression data. They are used primarily for exploratory analysis of complex data or as a diagnostic tool following a l...
ON LOCALLY CONFORMALLY FLAT GRADIENT SHRINKING RICCI SOLITONS
SHRINKING RICCI SOLITONS CONFORMALLY FLAT
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2015/8/17
In this paper, we first apply an integral identity on Ricci solitons to prove that
closed locally conformally flat gradient Ricci solitons are of constant sectional curvature.
We then ge...
Compact Gradient Shrinking Ricci Solitons with Positive Curvature Operator
Positive Curvature Operator Shrinking Ricci Solitons
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2015/8/17
In this paper, we first derive several identities on a compact shrinking Ricci
soliton. We then show that a compact gradient shrinking soliton must be
Einstein, if it admits a Riemannian metri...
Shrinking-horizon dynamic programming
dynamic programming model predictive control revenue management
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2015/8/7
We describe a heuristic control policy, for a general finite-horizon stochastic control problem, that can be used when the current process disturbance is not conditionally independent of previous dist...
Shrinking habitats have adverse effects on world ecosystems--and ultimately people
Shrinking habitats have adverse world ecosystems ultimately people
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2015/3/25
An extensive study of global habitat fragmentation--the division of habitats into smaller and more isolated patches--points to major trouble for the world's ecosystems.The study shows that 70 percent ...
Shrinking Targets for Countable Markov Maps
Countable Markov Maps Shrinking Targets Dynamical Systems
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2011/9/20
Abstract: Let $T$ be an expanding Markov map with a countable number of inverse branches and a repeller $\Lambda$ contained within the unit interval. Given $\alpha \in \R_+$ we consider the set of poi...
Application of Multi-Step Differential Transform Method on Flow of a Second-Grade Fluid over a Stretching or Shrinking Sheet
Non-Newtonian Fluid Stretching Surface Shrinking Sheet Multi-Step Differential Transform Method (MDTM)
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2013/1/30
In this study, a reliable algorithm to develop approximate solutions for the problem of fluid flow over a stretching or shrinking sheet is proposed. It is depicted that the differential transform meth...
On the self-shrinking systems in arbitrary codimension spaces
self-shrinking systems arbitrary codimension spaces
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2011/1/17
In this paper, we discuss the self-shrinking systems in higher codimensional spaces. We mainly obtain several Bernstein type results and a sharp growth estimate.MSC 2010: Primary 53C44.
Explicit solution of axisymmetric stagnation flow towards a shrinking sheet by DTM-Pade
Differential transform method Padé Approximant
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2010/11/1
In this letter, the differential transform method (DTM) is applied to the axisymmetric stagnation flow towards a shrinking sheet gives a system of nonlinear ordinary differential equations. The approx...
Effects of Fermi-surface shrinking on the optical sum rule in pnictides
Effects of Fermi-surface optical sum rule in pnictides
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2010/11/25
In this paper we investigate the effects of the band shifts induced by the interband spin-fluctuation coupling on the optical sum rule in pnictides. We show that, despite the shrinking of the Fermi su...