1,726,947 research outputs found
Segregation of wood chip/bark mixtures using liquid flotation procedures. Project 2977, report two : a progress report to members of Group Project 2977.
No full text"December 22, 1971.""Members of Group Project 2977: Cox Newsprint, Inc., Crown Zellerbach Corporation, Great Northern Paper Company, Hoerner Waldorf Corporation, International Paper Company, Masonite Corporation, Olinkraft, Inc., Publishers Paper Company, U.S. Plywood-Champion Papers Inc., Wausau Paper Mills Company.""The Institute of Paper Chemistry, Miles K. Benson ... John R. Peckham ... Dean W. Einspahr ... John W. Swanson.
Mandurama photograph collection [2977] [picture] /
No full textAlso available in an electronic version via the Internet at: http://nla.gov.au/nla.pic-an8526486-2977
Ash Cave in winter; same view as No. 2977.
No full textAsh Cave in winter; same view as No. 2977. Item #297
Ash Cave in winter; same view as No. 2977.
No full textAsh Cave in winter; same view as No. 2977. Item #297
Warren, Robert Penn, 1905-1989 (SC 2977)
Full text linkFinding aid only for Manuscripts Small Collection 2977. Newspaper and magazine clippings, programs and correspondence relating to the 80th anniversary of the Rhodes Scholars program at Oxford University. Robert Penn Warren participated in these festivities as a program alumnus. Includes a brief correspondence between Warren and fellow Rhodes alumnus Don Price
A weak scattering model for tone haystacking
No full textThe scattering of sound by turbulence in a jet shear layer is considered. Spectral broadening or 'haystacking' is the process whereby the turbulent, time-varying inhomogeneities in the flow scatter tonal sound fields, which decreasesthe level of the incident tone, but increases the broadband level around the frequency of the tone. The scattering process is modelled analytically, using high-frequency asymptotic methods and a weak-scattering assumption. Analytical models for the far-field spectral density of the scattered field are derived for two cases: (1) any polar angle including inside the cone of silence; (2) polar angles outside the cone of silence. At polar angles outside the cone of silence, the predictions from the two models are very similar, but using the second model it is considerably simpler to evaluate the far-field spectral density. Simulation results are compared to experimental data, albeit only at a polar angle of 90º. The model correctly predicts the behaviour of the scattered field as a function of jet velocity and tone frequency. Also simulations at other polar angles and a parametric study are presented. These simulations indicate how the 'haystacking' is predicted to vary as a function of the polar angle, and also as a function of the characteristic length, time and convection velocity scales of the turbulence contained in the jet shear layer
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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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Uranium–Lead Systematics of Lunar Basaltic Meteorite Northwest Africa 2977
Full text linkNorthwest Africa (NWA) 2977 is a lunar basaltic meteorite that was found in 2005 and has been classified as an olivine cumulate gabbro. This meteorite contains a shock melt vein (SMV) induced by an intense shock event. We report herein on an in-situ analysis of phosphates in the host gabbro and the shock vein for the U–Pb dating of NWA 2977 using an ion microprobe, NanoSIMS. The majority of the analyzed phosphates, in both the SMV and host-rock, lie on a linear regression in 238U/206Pb–207Pb/206Pb–204Pb/206Pb three-dimensional space, indicating a total Pb/U isochron age of 3.15±0.12 Ga (95% confidence level), which is consistent ages determined in previous isotopic studies of NWA 2977 (Sm–Nd age of 3.10±0.05 Ga, Rb–Sr age of 3.29±0.11 Ga, and Pb–Pb baddeleyite age of 3.12±0.01 Ga), and identical to the age of the U–Pb phosphate in a paired meteorite NWA 773, 3.09±0.20 Ga, derived from our dataset. There was no clear difference in the formation age between the phosphates found in the SMV and host-rock, although the shape and size of the grains and the Raman spectra show the evidence of intense shock metamorphism. Based on these findings, the cooling rate of the phosphate was very rapid, constrained to be larger than 140 K/s
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