2,337 research outputs found
Global Behavior Of Finite Energy Solutions To The -Dimensional Focusing Nonlinear Schr\"odinger Equation
We study the global behavior of finite energy solutions to the
-dimensional focusing nonlinear Schr\"odinger equation (NLS), with initial data . The
nonlinearity power and the dimension are such that the scaling index
is between 0 and 1, thus, the NLS is
mass-supercritical and energy-subcritical
For solutions with \ME[u_0]<1 (\ME[u_0] stands for an invariant and
conserved quantity in terms of the mass and energy of ), a sharp threshold
for scattering and blowup is given. Namely, if the renormalized gradient \g_u
of a solution to NLS is initially less than 1, i.e., \g_u(0)<1, then the
solution exists globally in time and scatters in (approaches some linear
Schr\"odinger evolution as ); if the renormalized gradient
\g_u(0)>1, then the solution exhibits a blowup behavior, that is, either a
finite time blowup occurs, or there is a divergence of norm in infinite
time.
This work generalizes the results for the 3d cubic NLS obtained in a series
of papers by Holmer-Roudenko and Duyckaerts-Holmer-Roudenko with the key
ingredients, the concentration compactness and localized variance, developed in
the context of the energy-critical NLS and Nonlinear Wave equations by Kenig
and Merle.Comment: 57 pages, 4 figures and updated reference
SIMULATED IMPACT OF A REGIONAL SHIFT IN FED CATTLE PRODUCTION ON THE LOCATION OF FED CATTLE SLAUGHTER
During the past decade fed cattle slaughter has relocated to states situated in the southwest plains. Concern has developed that the economic depletion of groundwater used for irrigating feeding activity could result in reduced levels of cattle feeding in that region. A reduction in cattle feeding activity could result in slaughtering plant closures and a relocation in slaughter activity to other regions. A mixed integer programming model was developed to simulate the possible effect of a declining cattle feeding industry in the southwest plains on the location of the fed cattle slaughtering and processing industry. Solution of the model indicated that the primary readjustment to lower levels of cattle feeding in the southwest plains would be in terms of plant and aggregate area volume, not plant location readjustment.Livestock Production/Industries,
ADOPTION OF BACKGROUNDING ON COW-CALF FARMS
A discrete choice model is used to analyze the decision to feed or sell calves at weaning. After accounting for regional factors, results show that operator perceptions toward profitability, risk, and facilities as well as control over production and attention to marketing impacted retained ownership of calves. Farm size had a minimal impact.Livestock Production/Industries,
Renormalization and blow up for charge one equivariant critical wave maps
We prove the existence of equivariant finite time blow up solutions for the
wave map problem from 2+1 dimensions into the 2-sphere. These solutions are the
sum of a dynamically rescaled ground-state harmonic map plus a radiation term.
The local energy of the latter tends to zero as time approaches blow up time.
This is accomplished by first "renormalizing" the rescaled ground state
harmonic map profile by solving an elliptic equation, followed by a
perturbative analysis
Low Temperature Deposition of Si02 Films by ECR
SiO films of high quality have been deposited by Electron Cyclotron Resonance (ECR) at temperatures less than 400 ° C. Chemistries of 02 and 25 % SiHqin Ar were used. Deposition rates of about 220 A/minute were obtained, studying films of typical thicknesses of 1100 A. Characteristics of the films studied include refractive index of 1.467 â 1.477, dielectric strengths of 5.0 â 9.0 MV/cm, dielectric constants of 3.8 â 4.2, and buffered HF etch rates of 19 - 21 A/second. These characteristics were shown to degrade around a deposition temperature of 200 °C, with temperatures on either side of this range yielding better characteristics. Optical emission spectroscopy was also utilized to identify the species present in the plasma
Stable self-similar blow-up dynamics for slightly -supercritical generalized KdV equations
In this paper we consider the slightly -supercritical gKdV equations
, with the nonlinearity
and . We will prove the existence and
stability of a blow-up dynamic with self-similar blow-up rate in the energy
space and give a specific description of the formation of the singularity
near the blow-up time.Comment: 38 page
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