Sound fields near building facades: comparison of finite and semi-infinite reflectors on a rigid ground plane

The sound field in front of, and close to a building facade is relevant to the measurement and prediction of environmental noise and sound insulation. For simplicity it is often assumed that the facade can be treated as a semi-infinite reflector, however in the low-frequency range (50–200 Hz) this is no longer appropriate as the wavelengths are similar or larger than the facade dimensions. Scale model measurements and predictions using integral equation methods have been used to investigate the effect of diffraction on the sound field in front of finite size reflectors. For the situation that is commonly encountered in front of building facades, the results indicate that diffraction effects are only likely to be significant in the low-frequency range (50–200 Hz) when the façade dimensions are less than 5 m. This assumes that there is a point source close to the ground and microphones at a height of 1.2 or 1.5 m, at a distance between 1 and 2 m in front of the façade. © 2008 Elsevier Ltd. All rights reserved

LMDA Canada Newsletter, September 2004

Contents include: Notes from the Chair; Life, Liberty and the Pursuit of Dramaturgy: The LMDA Annual Conference, Philadelphia, June 2004; Blurring the Boundaries: Notes from the LMDA Dramaturgy Mini-Conference; Production as Development: Re-thinking our Models of Dramaturgy; LMDA Canada: Membership Contact Listhttps://soundideas.pugetsound.edu/lmdanewsletter/1032/thumbnail.jp

LMDA Canada Newsletter, September 2005

Contents include: Notes from the Chair, Life, Liberty and the Pursuit of Dramaturgy: The LMDA Annual Conference, Philadelphia, June 2004, Blurring the Boundaries: Notes from the LMDA Dramaturgy Mini-Conference, Production as Development: Re-thinking our Models of Dramaturgy, LMDA Canada: Membership Contact Listhttps://soundideas.pugetsound.edu/lmdanewsletter/1026/thumbnail.jp

Flashes of Red: Dramaturgical Thinking in Action

Using the lens of ‘interference’ the essay examines the author’s work as a dramaturg and understanding of his approaches to dramaturgical thinking. The essay focuses on five areas of dramaturgical practice, including case studies that foreground ideas of interference in the sense of disruption and amplification in the following areas: 1) working with playwrights / creators; 2) with performance researchers; 3) with institutions; 4) with interns / mentees; and finally, 5) within the author’s own creative practice

A comparative study of major element rock analyses by argon plasma emission and atomic absorption/emission spectrophotometry.

Dept. of Geology and Geological Engineering. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis1978 .Q957. Source: Masters Abstracts International, Volume: 40-07, page: . Thesis (M.A.Sc.)--University of Windsor (Canada), 1978

LMDA Canada Newsletter, 2002/2003

Contents include: Report from the Chair, Toward New Developmental Structures, Challenging Assumptions: Vancouver 2002, Inside/Outside at the Mini-Conference: Toronto 2002, True Confessions: I was a Process Junkie!, Playwrights\u27 Development Centres: Establishing a New Network, LMDA Canada: Membership Contact Listhttps://soundideas.pugetsound.edu/lmdanewsletter/1024/thumbnail.jp

LMDA Review, volume 8, issue 2

Contents include: Head to Head 1997 Annual Conference, LMDA\u27s Statement of Principle Regarding Rent Lawsuit, A Letter from Canada, My Involvement with Rent, A Dramaturg Changes Hats: Tim Sanford on Career Flexibility, Regional News, The Advocacy Caucus Needs You, Mid-Atlantic/D.C. Metropolitan Regional Report, Dramaturgy Northwest, New York Regional, Regional Vice Presidents.https://soundideas.pugetsound.edu/lmdareview/1016/thumbnail.jp

PCA of Fe-oxides MLA data as an advanced tool in provenance discrimination and indicator mineral exploration : case study from bedrock and till from the Kiggavik U deposits area (Nunavut, Canada)

Magnetite and hematite grains from the 0.25–0.5 mm and 0.5–2.0 mm ferromagnetic fractions of ten till samples collected up-ice, overlying and down-ice of the Kiggavik U deposits (Nunavut, Canada), as well as eight bedrock samples from Kiggavik igneous and metasedimentary basement and overlying sedimentary rocks were characterized for their grain size and mineral association using optical microscopy, scanning electron microscopy (SEM) and mineral liberation analysis (MLA). Principal component analysis (PCA) was used to evaluate the MLA data for Fe-oxide mineral association and grain size distribution. PCA shows that mineralogical and granulometric differences in Fe-oxides from Kiggavik igneous rocks distinguish them from that of Kiggavik metasedimentary and sedimentary rocks. In addition, The PCA results indicate that the composition and abundance of minerals associated/intergrown with Fe-oxides are not only different in various till samples, but also in different size fractions of the same sample. Higher proportions of hornblende, quartz, gahnite, grunerite, apatite, chromite and sulfides are intergrown with Fe-oxides in the 0.5–2.0 mm till fraction, as compared to the 0.25–0.5 mm fraction in which Fe-oxides are mostly associated with pyroxene, titanite, rutile, feldspars, calcite and zircon. The mineral associations and grain sizes of proximal bedrocks are reflected in smaller size fractions of Kiggavik till, whereas detrital grains in the 0.5–2.0 mm fraction of Kiggavik till may have originated from distal sources. PCA also shows that Fe-oxides from the Kiggavik bedrock and till can be discriminated from those of volcanogenic massive sulfide (VMS) deposits because of smaller grain sizes and higher abundances of sulfides, gahnite, axinite, corundum, hypersthene and pyroxene intergrown with VMS Fe-oxides. This study emphasizes the importance of selecting suitable representative grain size fractions of till, or other sediments, when using indicator minerals for exploration. The results of PCA of Fe-oxides MLA data are consistent with the results of using Fe-oxides geochemical data in provenance discrimination of Kiggavik till