824 research outputs found
What is absolutely continuous spectrum?
This note is an expanded version of the author's contribution to the
Proceedings of the ICMP Santiago, 2015, and is based on a talk given by the
second author at the same Congress. It concerns a research program devoted to
the characterization of the absolutely continuous spectrum of a self-adjoint
operator H in terms of the transport properties of a suitable class of open
quantum systems canonically associated to H
Parent Communication in a Whole Language Kindergarten: What We Learned From a Busy First Year
Among recent developments in literacy research and practice is the increased recognition of the critical roles that parents play in the education of their children (Rasinki and Fredericks, 1989). Involving parents in their child\u27s literacy learning is particularly important for kindergarten teachers. The kindergarten literacy curriculum should build upon what children have begun to learn at home, and, continue to involve parents in supporting their child\u27s literacy development. Communicating with parents on how they can continue to give active support to their children\u27s literacy learning is an important task for kindergarten teachers
Enhancement of parity and time invariance violation in Radium atom
There are several factors which lead to a huge enhancement of parity and time
invariance violating effects in the Ra atom: very close electronic levels of
opposite parity, the large nuclear charge Z and the collective nature of
T,P-odd nuclear moments. Experiments with Radium may be used to measure it's
nuclear anapole, magnetic quadrupole and Schiff moments. Such measurements
provide information about parity and time invariance violating nuclear forces
and electron-nucleon interactions.Comment: 4 pages, RevTe
Serum-induced changes in the physiology of mammalian retinal glial cells: role of lysophosphatidic acid
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/65571/1/j.1469-7793.1998.445bw.x.pd
Second order perturbation theory for embedded eigenvalues
We study second order perturbation theory for embedded eigenvalues of an
abstract class of self-adjoint operators. Using an extension of the Mourre
theory, under assumptions on the regularity of bound states with respect to a
conjugate operator, we prove upper semicontinuity of the point spectrum and
establish the Fermi Golden Rule criterion. Our results apply to massless
Pauli-Fierz Hamiltonians for arbitrary coupling.Comment: 30 pages, 2 figure
Influence of Aerobic Exercise on Ghrelin-o-Acyltransferase in Normal Weight and Obese Adults: A Pilot Study
Please see the pdf version of the abstract
Scattering Theory Approach to Random Schroedinger Operators in One Dimension
Methods from scattering theory are introduced to analyze random Schroedinger
operators in one dimension by applying a volume cutoff to the potential. The
key ingredient is the Lifshitz-Krein spectral shift function, which is related
to the scattering phase by the theorem of Birman and Krein. The spectral shift
density is defined as the "thermodynamic limit" of the spectral shift function
per unit length of the interaction region. This density is shown to be equal to
the difference of the densities of states for the free and the interacting
Hamiltonians. Based on this construction, we give a new proof of the Thouless
formula. We provide a prescription how to obtain the Lyapunov exponent from the
scattering matrix, which suggest a way how to extend this notion to the higher
dimensional case. This prescription also allows a characterization of those
energies which have vanishing Lyapunov exponent.Comment: 1 figur
Friction in a Model of Hamiltonian Dynamics
We study the motion of a heavy tracer particle weakly coupled to a dense
ideal Bose gas exhibiting Bose-Einstein condensation. In the so-called
mean-field limit, the dynamics of this system approaches one determined by
nonlinear Hamiltonian evolution equations describing a process of emission of
Cerenkov radiation of sound waves into the Bose-Einstein condensate along the
particle's trajectory. The emission of Cerenkov radiation results in a friction
force with memory acting on the tracer particle and causing it to decelerate
until it comes to rest.Comment: 53 Page
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