1,724,730 research outputs found
Experimental study of dense pyroclastic density currents using sustained, gas-fluidized granular flows
Get PDFInternational audienceWe present the results of laboratory experiments on the behaviour of sustained, dense granular flows in a horizontal flume, in which high-gas pore pressure was maintained throughout the flow duration by continuous injection of gas through the flume base. The flows were fed by a sustained (0.5–30 s) supply of fine (75 ± 15 μm) particles from a hopper; the falling particles impacted an impingement surface at concentrations of ~3 to 45 %, where they densified rapidly to generate horizontally moving, dense granular flows. When the gas supplied through the flume base was below the minimum fluidization velocity of the particles (i.e. aerated flow conditions), three flow phases were identified: (i) an initial dilute spray of particles travelling at 1–2 m s−1, followed by (ii) a dense granular flow travelling at 0.5–1 m s−1, then by (iii) sustained aggradation of the deposit by a prolonged succession of thin flow pulses. The maximum runout of the phase 2 flow was linearly dependent on the initial mass flux, and the frontal velocity had a square-root dependence on mass flux. The frontal propagation speed during phase 3 had a linear relationship with mass flux. The total mass of particles released had no significant control on either flow velocity or runout in any of the phases. High-frequency flow unsteadiness during phase 3 generated deposit architectures with progradational and retrogradational packages and multiple internal erosive contacts. When the gas supplied through the flume base was equal to the minimum fluidization velocity of the particles (i.e. fluidized flow conditions), the flows remained within phase 2 for their entire runout, no deposit formed and the particles ran off the end of the flume. Sustained granular flows differ significantly from instantaneous flows generated by lock-exchange mechanisms, in that the sustained flows generate (by prolonged progressive aggradation) deposits that are much thicker than the flowing layer of particles at any given moment. The experiments offer a first attempt to investigate the physics of the sustained pyroclastic flows that generate thick, voluminous ignimbrites
Aerial Survey Photograph Showing Great Lakes Exhibition Site. 5910
No full textAerial Survey Photograph showing Great Lakes Exhibition Site Missing emulsion esp. on top left of image. White paper residue glued over areas of image was removed by the Preservation Department of KSL. Many scratches and indentations. Penciled on back of photo:"5910. 6/20/36. Great Lakes Expo. 5910"Great Lakes Exposition of 1936 and 193
EU-advokatens överklagande (HD:s dom i mål Ö 5910-20)
No full textDiskuterar Advokatsamfundets rättsliga karaktär i anledning av Högsta domstolens dom i mål Ö 5910-20
Block Card 5910 Curson Drive
No full textThis image was produced by the Auditor's Office in Lucas County, Ohio for tax assessment purposes. Associated dates are approximate. Descriptive terms related to this photograph include: Dwelling | 5910 Curson Drive (Toledo, Ohio) | McLains Hopewell Heights (Toledo, Ohio) | Greenwood Area (Toledo, Ohio) | West Toledo Area (Toledo, Ohio) | Folk House Styl
Block Card 5910 Benalex Drive
No full textThis image was produced by the Auditor's Office in Lucas County, Ohio for tax assessment purposes. Associated dates are approximate. Descriptive terms related to this photograph include: dwelling | 5910 Benalex Drive (Toledo, Ohio) | Ranch houses | North Toledo (Toledo, Ohio) | Greenwood Area (Toledo, Ohio) | Benalex Heights (Toledo, Ohio
Block Card 5910 Jackman Road
No full textThis image was produced by the Auditor's Office in Lucas County, Ohio for tax assessment purposes. Associated dates are approximate. Descriptive terms related to this photograph include: Dwelling | 5910 Jackman Road (Toledo, Ohio) | Bungalow Style | McLains Hopewell Heights (Toledo, Ohio) | Greenwood Area (Toledo, Ohio) | West Toledo Area (Toledo, Ohio
One world connected: an assessment of Australia’s progress in suicide prevention
Get PDFOverview: This paper provides a detailed assessment of Australia\u27s progress in suicide prevention. Written in response to the landmark World Health Organisation report Preventing Suicide: A global imperative, the National Coalition for Suicide Prevention, led by Suicide Prevention Australia, looks at the report findings in relation to Australia and suicide prevention, it explores what we are doing well and what we need to do differently. This paper offers a brief summary of points of interest from the WHO Report as well as a view on how Australia is performing against some of the criteria set out in this Report as important for a successful national suicide prevention strategy. For ease of reference, we have used a traffic light system so readers can easily identify where Australia is performing well, where we are heading in the right direction but have work to do; and where serious discussion and action is required
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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