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