58 research outputs found
Mean curvature flow of monotone Lagrangian submanifolds
We use holomorphic disks to describe the formation of singularities in the
mean curvature flow of monotone Lagrangian submanifolds in .Comment: 37 pages, 3 figure
Health Management Programs: A Different and Necessary Approach to Health Care
For 40 hours a week, generally for 50 weeks a year, approximately 100 million Americans can be found at a place of work. That is more than enough time for them to develop lifestyle habits--habits that can and do affect both the quality and the length of their lives. Major corporations in the United States have initiated employee health management programs because they are concerned with lifestyle-related illnesses and their associated spiraling medical costs. Kimberly-Clark Corporation, Neenah, Wisconsin, is a company that developed a Health Management Program at a time when they were questioned and considered to be impractical by many. The program has survived to become an industry-wide leader and role model. Their story is well worth sharing
Singularities of Lagrangian mean curvature flow: zero-Maslov class case
We study singularities of Lagrangian mean curvature flow in \C^n when the
initial condition is a zero-Maslov class Lagrangian. We start by showing that,
in this setting, singularities are unavoidable. More precisely, we construct
Lagrangians with arbitrarily small Lagrangian angle and Lagrangians which are
Hamiltonian isotopic to a plane that, nevertheless, develop finite time
singularities under mean curvature flow.
We then prove two theorems regarding the tangent flow at a singularity when
the initial condition is a zero-Maslov class Lagrangian. The first one (Theorem
A) states that that the rescaled flow at a singularity converges weakly to a
finite union of area-minimizing Lagrangian cones. The second theorem (Theorem
B) states that, under the additional assumptions that the initial condition is
an almost-calibrated and rational Lagrangian, connected components of the
rescaled flow converges to a single area-minimizing Lagrangian cone, as opposed
to a possible non-area-minimizing union of area-minimizing Lagrangian cones.
The latter condition is dense for Lagrangians with finitely generated
.Comment: 34 pages. 3 figures. To appear in Inventione
The Clifford torus as a self-shrinker for the Lagrangian mean curvature flow
We provide several rigidity results for the Clifford torus in the class of
compact self-shrinkers for Lagrangian mean curvature flow.Comment: 10 page
Mean Curvature Flow of Spacelike Graphs
We prove the mean curvature flow of a spacelike graph in of a map from a closed Riemannian
manifold with to a complete Riemannian manifold
with bounded curvature tensor and derivatives, and with
sectional curvatures satisfying , remains a spacelike graph,
exists for all time, and converges to a slice at infinity. We also show, with
no need of the assumption , that if , or if and
, constant, any map is trivially
homotopic provided where
, in case , and
in case . This largely extends some known results for
constant and compact, obtained using the Riemannian structure
of , and also shows how regularity theory on the mean
curvature flow is simpler and more natural in pseudo-Riemannian setting then in
the Riemannian one.Comment: version 5: Math.Z (online first 30 July 2010). version 4: 30 pages:
we replace the condition by the the weaker one .
The proofs are essentially the same. We change the title to a shorter one. We
add an applicatio
Energy properness and Sasakian-Einstein metrics
In this paper, we show that the existence of Sasakian-Einstein metrics is
closely related to the properness of corresponding energy functionals. Under
the condition that admitting no nontrivial Hamiltonian holomorphic vector
field, we prove that the existence of Sasakian-Einstein metric implies a
Moser-Trudinger type inequality. At the end of this paper, we also obtain a
Miyaoka-Yau type inequality in Sasakian geometry.Comment: 27 page
Impacts of soil conditions and light availability on natural regeneration of Norway spruce Picea abies (L.) H. Karst. in low-elevation mountain forests
& Key message Natural regeneration of P. abies (L.) H. Karst. may reach high densities in lower mountain elevations. The
highest densities were found in sites with moderate light availability, with low pH, and not near the riverbank. However,
age-height classes differed in the predicted magnitude of response, but were consistent in response directions. Mosses and
understory species typical of coniferous forests were positively correlated with regeneration density.
& Context Norway spruce Picea abies (L.) H. Karst. in Central Europe is at risk under climate change scenarios, particularly in
mountain regions. Little is known about the impact of environmental factors on the natural regeneration of P. abies in lowelevation mountain forests.
& Aims We aimed to assess impacts of distance from the riverbank, soil pH, and light availability on natural P. abies regeneration.
We hypothesized that (1) natural P. abiesregeneration would depend on light availability and soil pH and (2) there are understory
plant species which may indicate the microsites suitable for natural regeneration of P. abies.
& Methods The study was conducted in the Stołowe Mountains National Park (SW Poland, 600–800 m a.s.l.). We established 160
study plots (25 m2
) for natural regeneration, light availability, soil pH, and understory vegetation assessment
New distributional data on Bryophytes of Poland and Slovakia, 8
This work presents a list of localities for the following species: Anastrophyllum michauxii, Campylopus
introflexus, Cephaloziella elachista, Cinclidotus fontinaloides, Cololejeunea calcarea, Dicranum viride, Didymodon
spadiceus, Fissidens dubius var. mucronatus, Fossombronia wondraczekii, Fuscocephaloziopsis macrostachya, Hypnum
cupressiforme var. subjulaceum, Lophozia ascendens, Mesoptychia heterocolpos, Nowellia curvifolia, Rhytidiadelphus
loreus, Saccobasis polita, and Trichocolea tomentella
New distributional data on bryophytes of Poland and Slovakia, 10
This work presents a list of localities for the following species: Anomodon attenuatus, A. viticulosus,
Dicranum viride, Gymnomitrion alpinum, Hedwigia ciliata, Homalia trichomanoides, Lophoziopsis longidens, Obtusifolium
obtusum, Odontoschisma elongatum, Orthodicranum tauricum, Porella platyphylla, and Syntrichia papillosa
New distributional data on bryophytes of Poland and Slovakia, 10
This work presents a list of localities for the following species: Anomodon attenuatus, A. viticulosus,
Dicranum viride, Gymnomitrion alpinum, Hedwigia ciliata, Homalia trichomanoides, Lophoziopsis longidens, Obtusifolium
obtusum, Odontoschisma elongatum, Orthodicranum tauricum, Porella platyphylla, and Syntrichia papillosa
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