144,742 research outputs found
The Cauchy Problem for the Wave Equation in the Schwarzschild Geometry
The Cauchy problem is considered for the scalar wave equation in the
Schwarzschild geometry. We derive an integral spectral representation for the
solution and prove pointwise decay in time.Comment: 33 page
Point interactions in acoustics: one dimensional models
A one dimensional system made up of a compressible fluid and several
mechanical oscillators, coupled to the acoustic field in the fluid, is analyzed
for different settings of the oscillators array. The dynamical models are
formulated in terms of singular perturbations of the decoupled dynamics of the
acoustic field and the mechanical oscillators. Detailed spectral properties of
the generators of the dynamics are given for each model we consider. In the
case of a periodic array of mechanical oscillators it is shown that the energy
spectrum presents a band structure.Comment: revised version, 30 pages, 2 figure
Andreas-Holger Maehle, Contesting Medical Confidentiality, Origins of the Debate in the United States, Britain and Germany
No abstract available
Listening skills instruction: practical tips for processing aural input
Two listening challenges faced by English L2 learners are (1) successfully identifying words in continuous speech and (2) understanding a speaker’s intended meaning. Listening is a skill L2 learners report wanting to improve, yet teaching practices often fail to advance learner knowledge and control of listening processes. Instructors can benefit from empirically-supported recommendations to help learners parse continuous speech, and discern speaker intent. This Teaching Tip shares two 3-part strategies to facilitate processing utterance content and interpreting message meaning. The practical tips presented here are consistent with a return in the larger TESOL field to a true communicative approach, relying on authentic materials and real communicative contexts rather than mere mimicry of connected speech features or particular intonation contours.Published versio
Regularity of Bound States
We study regularity of bound states pertaining to embedded eigenvalues of a
self-adjoint operator , with respect to an auxiliary operator that is
conjugate to in the sense of Mourre. We work within the framework of
singular Mourre theory which enables us to deal with confined massless
Pauli-Fierz models, our primary example, and many-body AC-Stark Hamiltonians.
In the simpler context of regular Mourre theory our results boils down to an
improvement of results obtained recently in \cite{CGH}.Comment: 70 page
GEOL 112: Hazards, Risks of Earthquakes and Volcanoes Textbook Alternatives
Poster summarizing cost saving textbook alternatives for GEOL 112: Hazards, Risks of Earthquakes and Volcanoes.https://scholarworks.sjsu.edu/davinci_tap2014/1005/thumbnail.jp
Today's Choices, Tomorrow's Changes
Provides an overview of the issues in California's November 2008 elections -- the status quo of education, infrastructure, environment, budget, and governance, and the need for change in each area
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