9,631 research outputs found
On the stability of Poiseuille pipe flow
Numerical analysis of Poiseuille pipe flow stability using Reynolds numbe
Moving Toward Non-transcription Based Discourse Analysis in Stable and Progressive Aphasia
Measurement of communication ability at the discourse level holds promise for predicting how well persons with stable (e.g., stroke-induced), or progressive aphasia navigate everyday communicative interactions. However, barriers to the clinical utilization of discourse measures have persisted. Recent advancements in the standardization of elicitation protocols and the existence of large databases for development of normative references have begun to address some of these barriers. Still, time remains a consistently reported barrier by clinicians. Non-transcription based discourse measurement would reduce the time required for discourse analysis, making clinical utilization a reality. The purpose of this article is to present evidence regarding discourse measures (main concept analysis, core lexicon, and derived efficiency scores) that are well suited to non-transcription based analysis. Combined with previous research, our results suggest that these measures are sensitive to changes following stroke or neurodegenerative disease. Given the evidence, further research specifically assessing the reliability of these measures in clinical implementation is warranted
Just What Community Psychologists Would Do: A Commentary on the Special issues
The papers in these two Global Journal special issues focus on the 18 Community Psychology Practice Competencies proposed by the Society for Community Research and Action (SCRA) in 2012. In this commentary, I articulate some of my enjoyment in reading the articles in these special issues, share some thoughts on the history of the practice competencies, and propose some ideas for conversations that may be useful in their development over time.
The SCRA practice competencies have been useful in opening conversations about how to articulate what community psychologists can do in working with community members, and about how to provide educational practices to prepare students for that work. These special issues build on the volume on community psychology practice edited by Scott and Wolfe (2015) and the earlier Global Journal special issue on international competencies (Wolfe, Scott, & Jimenez, 2013). The practice competencies can be useful only if we consider them to be inevitably incomplete descriptions of community psychology practices – practices that are inherently dynamic, contextual, and value-laden. They can be useful only if we continually re-examine and revise them, and adapt them as needed for work in specific contexts
Just What Community Psychologists Would Do: A Commentary on the Special issues
The papers in these two Global Journal special issues focus on the 18 Community Psychology Practice Competencies proposed by the Society for Community Research and Action (SCRA) in 2012. In this commentary, I articulate some of my enjoyment in reading the articles in these special issues, share some thoughts on the history of the practice competencies, and propose some ideas for conversations that may be useful in their development over time.
The SCRA practice competencies have been useful in opening conversations about how to articulate what community psychologists can do in working with community members, and about how to provide educational practices to prepare students for that work. These special issues build on the volume on community psychology practice edited by Scott and Wolfe (2015) and the earlier Global Journal special issue on international competencies (Wolfe, Scott, & Jimenez, 2013). The practice competencies can be useful only if we consider them to be inevitably incomplete descriptions of community psychology practices – practices that are inherently dynamic, contextual, and value-laden. They can be useful only if we continually re-examine and revise them, and adapt them as needed for work in specific contexts
Overview of Articles in the Special Issues
Below I provide a brief overview and commentary on each article in these special issues of the Global Journal of Community Psychology Practice. In describing each article below, I have noted the practice competencies highlighted by the authors, and also listed in brackets any other competencies that seemed to me to be especially involved in their work. I also listed any Proposed Competencies specified in each article
Overview of Articles in the Special Issues
Below I provide a brief overview and commentary on each article in these special issues of the Global Journal of Community Psychology Practice. In describing each article below, I have noted the practice competencies highlighted by the authors, and also listed in brackets any other competencies that seemed to me to be especially involved in their work. I also listed any Proposed Competencies specified in each article
Alien Registration- Dalton, John H. (Houlton, Aroostook County)
https://digitalmaine.com/alien_docs/36244/thumbnail.jp
Field Quantization, Photons and Non-Hermitean Modes
Field quantization in three dimensional unstable optical systems is treated
by expanding the vector potential in terms of non-Hermitean (Fox-Li) modes in
both the cavity and external regions. The cavity non-Hermitean modes (NHM) are
treated using the paraxial and monochromaticity approximations. The NHM
bi-orthogonality relationships are used in a standard canonical quantization
procedure based on introducing generalised coordinates and momenta for the
electromagnetic (EM) field. The quantum EM field is equivalent to a set of
quantum harmonic oscillators (QHO), associated with either the cavity or the
external region NHM. This confirms the validity of the photon model in unstable
optical systems, though the annihilation and creation operators for each QHO
are not Hermitean adjoints. The quantum Hamiltonian for the EM field is the sum
of non-commuting cavity and external region contributions, each of which is sum
of independent QHO Hamiltonians for each NHM, but the external field
Hamiltonian also includes a coupling term responsible for external NHM photon
exchange processes. Cavity energy gain and loss processes is associated with
the non-commutativity of cavity and external region operators, given in terms
of surface integrals involving cavity and external region NHM functions on the
cavity-external region boundary. The spontaneous decay of a two-level atom
inside an unstable cavity is treated using the essential states approach and
the rotating wave approximation. Atomic transitions leading to cavity NHM
photon absorption have a different coupling constant to those leading to photon
emission, a feature resulting from the use of NHM functions. Under certain
conditions the decay rate is enhanced by the Petermann factor.Comment: 38 pages, tex, 2 figures, ps. General expression for decay rate
added. To be published in Journal of Modern Optic
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