2,166 research outputs found
Occurrence and physical setting of ferromanganese nodules beneath the Deep Western Boundary Current, SW Pacific
No full textAn extensive ferromanganese nodule field adjacent to the Campbell Plateau in the Southwest Pacific Ocean forms beneath the Deep Western Boundary Current (DWBC) and Antarctic Circumpolar Current (ACC). West of c. 174°E, between 59 and 48°S, the field is inferred to be 300–500 km wide, but east of 174°E, where the currents impinge on the eastern slope of the Campbell Plateau, the field narrows from c. 200 km at 55°S to c. 120 km at 49°S. This coincides with deflection of current flow eastward, and consequent reduction in bottom-current velocity and eddy kinetic energy. Based on seafloor photographs, dredge samples, and 3.5 kHz profile data, five principal nodule facies form broadly parallel zones eastwards from the lowermost Campbell escarpment. These are defined based on location, presumed nodule genesis, and seafloor nodule density: (1) slope hydrogenous, high-density (SHH); (2) abyssal diagenetic/hydrogenous, low-density (ADHL); (3) abyssal hydrogenous, high-density (AHH); (4) abyssal diagenetic, high-density (ADH); and (5) abyssal diagenetic, low-density (ADL). Several nodule morphotypes are identified including distinctive discoidal forms with overgrowths possibly resulting from overcrowding and partial sediment burial. Seafloor abundance, surficial textures, and chemistry indicate a predominantly hydrogenous nodule growth and very low net sedimentation beneath the core of the DWBC. Increasing Mn, Ni, and Cu contents, and decreasing detrital silicate contents from core to rim, reflect intensifying abyssal DWBC circulation since c. 6 Ma. Because of the DWBC’s high velocity, the nodules provide no record of an increasing terrigenous bedload from New Zealand since c. 3 Ma. However, in regions of reduced flow velocity eastwards from the main DWBC pathway, relatively higher sedimentation rates prevail, and nodules have a higher diagenetic component
Improving the performance of the trolley supply chain with a focus on visibility.
No full textThe lack of visibility, significant investment and a presumption of fleet shrinkage falter the decision-making process of a Dutch airline. Five decision areas have been identified and for each decision area improvements strategies or alternatives have been designed. Selecting the best alternative per decision area is a multi-criteria decision making problem. Therefore, a more sophisticated method is required to support the decision-maker. For this problem the novel Best-Worst Multi-Criteria Decision Making Method (BWM) has been selected. The BWM has been successfully applied to select the best alternative per decision area. Next steps for the airline are the implementation of the chosen alternatives.SEPAMTransport & LogisticsTechnology, Policy and Managemen
Macrocalymma aliciae Meade-Waldo 1914
No full textaliciae Meade-Waldo Macrocalymma aliciae Meade Waldo, 1914: 459, female—“S.W. Australia: Yallingup” (London, type no. 18.119).— Bequaert 1928b: 150 (note on type).— Bohart & Stange 1965: 11 (examined).— Giordani Soika 1969: 97 (key), 99.— Cardale 1985: 180 (cat.).Published as part of Carpenter, James M. & Brown, Graham R., 2021, Catalogue of the Australian Eumeninae (Hymenoptera: Vespidae), pp. 1-68 in Zootaxa 4919 (1) on page 14, DOI: 10.11646/zootaxa.4919.1.1, http://zenodo.org/record/447337
Buckfast Abbey Archaeological Projects 1982-2016 Photographic Archive
No full textThis photographic archive is intended to augment the two publications on the abbey's archaeology by S.W. Brown (Proceedings of the Devon Archaeological Society 46, 1988, 13-89; and Devon Archaeological Society Occasional Paper 21, 2018) and the series of more detailed interim archive reports appearing on the ADS website (unpublished grey literature, accessible via author Stewart Brown)
Optical properties of chromophoric dissolved organic matter (CDOM) in arctic lakes of Southwest Greenland
No full textDataset of optical properites of chromophoric dissolved organic matter from lakes in S.W. Greenland obtained over a number of studies, and used in the publication listed below (submitted).
Christopher Osburn (North Carolina State University), John Anderson (Loughborough University) , Colin Stedmon (Technical University of Denmark) , Madeline Giles (The James Hutton Institute) , Erika Whiteford (Nottingham Trent University) , Terry McGenity (University of Essex) , Alex Dumbrell (University of Essex) , Graham J C Underwood (University of Essex)
Regional variation in the optical properties of chromophoric dissolved organic matter (CDOM) in arctic lakes of Southwest Greenland, [Paper # 2017JG003999 submitted to Journal of Geophysical Research - Biogeosciences)
Environment-insensitive two-photon ratiometric probe for in cellulo quantitative measurement of hydrogen peroxide
No full textThe quantitative analysis of a biological analyte directly through fluorescence imaging is essential in biomedical sciences but remains as a challenge owing to the environment-sensitive nature of fluorescence intensity. We show that a fluorescent hydrogen peroxide probe based on an in cellulo super-bright benzothiazolyl-benzocoumarin dye of which emission properties are insensitive to environmental changes offers a reliable and practical means for the quantitative analysis of hydrogen peroxide in cells and tissues directly through ratiometric imaging both under one-photon and two-photon excitation conditions. Different cellular hydrogen peroxide concentrations were determined for several cell lines and also for tumour and normal tissues. © 2021 The Author(s)11Nscopu
On the age and correlation of the St. Erth Beds, S.W. England, based on planktonic foraminifera
No full textAbstract. The paper illustrates and describes 15 species of planktonic foraminifera from the St. Erth Beds, Cornwall, S.W. England. The overlap of the stratigraphic ranges of Globorotalia inflata (d’Orbigny), G. praehirsuta Blow, G. tosaensis Takayanagi &amp; Saito, Pulleniatina primalis Banner &amp; Blow, Neogloboquadrina humerosa (Takayanagi &amp; Saito) and dextrally coiled N. pachyderma (Ehrenberg) places the age of the fauna in the Globorotalia inflata Zone, Late Pliocene. The absence of Globorotalia puncticulata (Deshayes), G. truncatulinoides (d’Orbigny) and Neogloboquadrina atlantica (Berggren) confirms this age assignment and with the presence of G. inflata (d’Orbigny), the deposition of St. Erth beds can now be accurately placed at between 2.1 and 1.9 Ma. For this paper, it has been acceped that the Pliocene-Pleistocene boundary is marked by the first evolutionary appearance of G. truncatulinoides at about 1.9 Ma.</jats:p
Ischnocoelia fulva subsp. major Meade-Waldo 1914
No full textfulva major Meade-Waldo Ischnocoelia integra var. major Meade-Waldo 1914: 459, female, male—“S.W. AUSTRALIA:Yallingup” (lectotype male London, type no. 18.130a).— Bequaert 1928b: 151 (holotype is female from Yallingup, S. W.Australia).— Giordani Soika 1969: 81 (designation of lectotype), Ischnocoelia major; Bohart & Stange 1965: 11 (examined). Ischnocoelia fulva major; Giordani Soika 1969: 81, fig. 44 (W. A.: Bunbury).— Cardale 1985: 178 (cat.).— Borsato 2003: 519 (W. A.: “ 12 km WNW Harvey”). gregoryensis Borsato Ischnocoelia gregoryensis Borsato 2003: 511, 519, fig. 12—“ Northern Territory, Gregory N. P., Victoria River” (holotype male Canberra); “morph a” from W. A.: (15.38S.— 125.15E) 4 km W of King Cascade.”Published as part of Carpenter, James M. & Brown, Graham R., 2021, Catalogue of the Australian Eumeninae (Hymenoptera: Vespidae), pp. 1-68 in Zootaxa 4919 (1) on page 12, DOI: 10.11646/zootaxa.4919.1.1, http://zenodo.org/record/447337
Molecular simulation of porous silica and B-alumina, using a scalable method for electrostatic interactions
No full textApplied Science
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