Separated laminar boundary layers

Classical boundary layer theory is inadequate to deal with the problem of flow separation owing to its underlying assumption that the boundary layer has an insignificant effect on the external stream. This difficulty is resolved by a theory which includes interaction with the external flow. This theory is described from the viewpoint of the asymptotic triple deck structure. Several triple deck studies are reviewed with emphasis on results of interest in aeronautical applications

A QM/MM equation-of-motion coupled-cluster approach for predicting semiconductor color-center structure and emission frequencies

Valence excitation spectra are computed for all deep-center silicon-vacancy defect types in 3C, 4H, and 6H silicon carbide (SiC) and comparisons are made with literature photoluminescence measurements. Nuclear geometries surrounding the defect centers are optimized within a Gaussian basis-set framework using many-body perturbation theory or density functional theory (DFT) methods, with computational expenses minimized by a QM/MM technique called SIMOMM. Vertical excitation energies are subsequently obtained by applying excitation-energy, electron-attached, and ionized equation-of-motion coupled-cluster (EOMCC) methods, where appropriate, as well as time-dependent (TD) DFT, to small models including only a few atoms adjacent to the defect center. We consider the relative quality of various EOMCC and TD-DFT methods for (i) energy-ordering potential ground states differing incrementally in charge and multiplicity, (ii) accurately reproducing experimentally measured photoluminescence peaks, and (iii) energy-ordering defects of different types occurring within a given polytype. The extensibility of this approach to transition-metal defects is also tested by applying it to silicon-substitutional chromium defects in SiC and comparing with measurements. It is demonstrated that, when used in conjunction with SIMOMM-optimized geometries, EOMCC-based methods can provide a reliable prediction of the ground-state charge and multiplicity, while also giving a quantitative description of the photoluminescence spectra, accurate to within 0.1 eV of measurement in all cases considered.Comment: 13 pages, 4 figures, 6 tables, 5 equations, 100 reference

A Holistic Approach to Promote Sleep for People Emerging from Homelessness: A Good Night’s Rest in Your Nest Sleep Toolkit

Background: Sleep deprivation has been linked to chronic health issues, decreased physical and cognitive functioning, and overall decreased quality of life, which limits the ability to engage in desired tasks and occupations (Gonzalez & Tyminski, 2020). Obtaining restful sleep serves as a foundation for optimal cognitive and physical functioning during daily tasks, roles, and activities (AOTA, 2017). Individuals who have experienced homelessness consistently demonstrate higher rates of sleep inadequacies compared to the general public, highlighting the need for service providers to address the quality of sleep participation for this population (Gonzalez & Tyminski, 2020). Purpose • Promote sleep participation for individuals emerging from homelessness • Supply occupational therapy practitioners and other service providers with evidence-based and model-driven materials • Incorporated into client’s daily routines, habits, and environments. • Assist clients in establishing healthy bedtime routines, make environmental modifications, and enhance the mind-body-spirit connection Methods: • A thorough literature review was completed to determine current interventions approaches, programming types, the role of occupational therapy, and barriers to sleep participation for individuals emerging from homelessness. • Literature revealed a significant need interventions to promote sleep for individuals emerging from homelessnesshttps://commons.und.edu/frank-low-posters/1001/thumbnail.jp

Konziliengeschichte. Briefe um das I. Vaticanum. Aus der Korrespondenz des Konzilssekretärs Bischof Fessler von St. Pölten. [Reseña]

Reseña de Walter BRANDMÜLLER, Konziliengeschichte. Briefe um das I. Vaticanum. Aus der Korrespondenz des Konzilssekretärs Bischof Fessler von St. Pölten 1869-1872, Verlag Ferdinand Schöningh, Paderborn- München-Wien-Zürich 2005, 178 pp., 16 x 24, ISBN 3-506-71359-0