5,903 research outputs found
Storm-driven changes in rip channel patterns on an embayed beach
No full textThis paper introduces a semi-automatic computer algorithm designed to detect rip current channels in video imagery. As a case study, this method is applied to 3.3 years of video data from an embayed beach to demonstrate the link between antecedent surf zone morphology, wave energy and up/down transitions in beach state. An objective measure of rip channel change was developed to define six significant rip reconfiguration events and relate these events to wave energy. Over the period of study no complete resets of the nearshore morphology occurred. The analysis indicates that direct correlation of rip patterns with the instantaneous wave conditions is not a useful way to demonstrate how rips and waves interact. The average wave energy over a period of ten days, combined with storm duration were good indicators of rip channel change, demonstrating that in general, beach morphology responds with a time lag to changes in forcing. Rip channels with a short cross-shore length and narrow alongshore spacing responded faster to changes in wave conditions than rips with a long cross-shore length and wider alongshore spacing. To force changes in the rip morphology, longer rip channels required wave events of higher energy and/or a longer duration. Offshore islands protect the beach under certain wave approach angles, sometimes resulting in a dual-width surf zone, which was narrow at the sheltered end and wide at the exposed end of the beach. The wider surf zone end was characterised by three dominant and persistent rip channels, whereas the narrow surf zone section contained a number of smaller rips which evolved rapidly under wave forcing. Our observations demonstrate the importance of rip channel size in controlling the response time of nearshore morphology
SPEAKING WITH AUTHORITY: POLYPHONY IN CALLIMACHUS’ HYMNS
No full textPolyphony in Callimachus is often a strategy of persuasion: adopting a plurality
of points of view in the presentation of an argument makes that argument
more authoritative—especially when the authority of at least some of these
points of view can be taken for granted. This paper investigates a few examples
of the frequent overlapping of the authorial voice of Callimachus with
different Callimachean voices impersonating or allusively evoking a series of
more or less peremptory figures—a literary critic in defense of his poetics,
the vox populi, the director of a ritual for a god, the god himself, or a series
of saviors of the past. The paper concludes with an argument that the editor
of Callimachus’ Hymns (Callimachus himself?) may have hidden behind the
authority of Callimachus the “theologian”
Review of S.A. Stephens (2015) Callimachus: the Hymns
No full textReview of Stephens, S. A. Callimachus: the Hymns. Oxford/New York, Oxford University Press, 2015. xiv, 324 pp. Pr. £19.49 (pb). ISBN 9780199783045
[Portrait of Violet Mary Davis, daughter of Steele Rudd, with Lorna Brodie and Kitty Stephens] [picture] /
No full textCondition : Fair, some damage around borders.; Inscriptions: "Fegan, Brisbane" --Embossed lower right corner.; Title from caption on compactus card.; "Davis, Violet Mary (Mrs S.A. Bradley) on left, daughter of Steele Rudd, with Lorna Brodie (Mrs G. Hogg), Kitty Stephens (Mrs G. Jamieson)" --Compactus card
Reconstructing the Siluro-Devonian coastline of Gondwana: insights from the sedimentology of the Port Stephens Formation, Falkland Islands
No full textSilurian and lower Devonian sedimentary successions are uncommon within the remnants of Gondwana. The Port Stephens Formation, the basal unit of the middle Palaeozoic West Falkland Group, presents a rare opportunity to study Gondwanan material of Siluro-Devonian age. The formation on West Falkland is c. 2560 m thick and consists of five members: Plantation, Albemarle, Mount Alice, South Harbour and Fish Creek. Thirty-five lithofacies are defined using variations in grain size and bedding characteristics. The distribution of these lithofacies and their associated ichnofacies between the various members lead us to suggest terrestrial and shallow marine deposition on an extensive, gently shelving alluvial to coastal plain. Vertical facies trends through the Port Stephens Formation, and into the base of the overlying Fox Bay Formation, record a complex superposition of subenvironments within a distinct overall transgressive–regressive–transgressive pattern, with the bulk of sediment accumulating during the regressive phase. Palaeocurrents indicate a basin to the present-day NE throughout. These results, together with lithostratigraphic correlations between the Port Stephens Formation and the Nardouw Subgroup in South Africa, are consistent with a reconstructed position off eastern South Africa and on the palaeo-Pacific margin of Gondwana, requiring a near-180° rotation of the Falkland Island microplate during break-up, in agreement with previous models. We suggest that global changes in sea level during the mid–late Silurian and early Devonian strongly influenced changes in the depositional environment. Enhanced erosion of the continental margin and extensive sediment bypass during the regressive phase of this cycle could help to explain the low abundance of preserved Gondwanan material of this age
Conformational isomerism of n-butyl nitrate studied by microwave spectroscopy
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Previous issue date: 2019-06-18The rotational spectrum of n-butyl nitrate was measured with a chirped pulse Fourier transform microwave \mbox{spectrometer} over the range of 7-13 GHz. This allowed for the identification and assignment of five conformers, AGA, GAA, GGA, AAA, and GG'A with intensity ratios of approximately 1 : 0.2 : 0.2 : 0.1 : 0.1. These conformers were \mbox{subsequently} investigated by Balle-Flygare Fourier transform microwave spectroscopy in order to resolve the nuclear \mbox{electric} quadruople coupling splitting and for further transitions to be collected, allowing improved fitting. Isotopic \mbox{substitutions} at natural abundance were also observed for the AGA conformer. Quantum chemical calculations reveal that the AGA \mbox{conformer} is the lowest in energy. A variety of computational methods were used to explore the energy ordering and barriers between inter-conversion of the lowest lying energy conformers. This work extends a series of other alkyl nitrate works studied by microwave and mm-wave spectroscopy.\footnote{Methyl Nitrate; W.B. Dixon, E.B. Wilson, {\it{J. Chem. Phys.}}, {\bf{35}}, 191 (1961)} \footnote{Ethyl Nitrate; D.G. Scroggrin, J.M. River, E.B. Wilson, {\it{J. Chem. Phys.}}, {\bf{60}}, 1376 (1974); J. Thomas, I. Medvedev, D. Dolson, ISMS 2014} \footnote{n-Propyl Nitrate; W. Orellana, S.L. Stephens, S.E. Novick, S.A. Cooke, C. Brauer, T.A. Blake, ISMS 2019}
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\includegraphics[width=0.95\textwidth] {nBN.eps}
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Reconstructing the Siluro-Devonian coastline of Gondwana: insights from the sedimentology of the Port Stephens Formation, Falkland Islands
No full textSilurian and lower Devonian sedimentary successions are uncommon within the remnants of Gondwana. The Port Stephens Formation,
the basal unit of the middle Palaeozoic West Falkland Group, presents a rare opportunity to study Gondwanan material of Siluro-Devonian
age. The formation on West Falkland is c. 2560 m thick and consists of five members: Plantation, Albemarle, Mount Alice, South Harbour and Fish Creek. Thirty-five
lithofacies are defined using variations in grain size and bedding characteristics. The distribution of these lithofacies
and their associated ichnofacies between the various members lead us to suggest terrestrial and shallow marine deposition
on an extensive, gently shelving alluvial to coastal plain. Vertical facies trends through the Port Stephens Formation, and
into the base of the overlying Fox Bay Formation, record a complex superposition of subenvironments within a distinct overall
transgressive–regressive–transgressive pattern, with the bulk of sediment accumulating during the regressive phase. Palaeocurrents
indicate a basin to the present-day NE throughout. These results, together with lithostratigraphic correlations between the
Port Stephens Formation and the Nardouw Subgroup in South Africa, are consistent with a reconstructed position off eastern
South Africa and on the palaeo-Pacific margin of Gondwana, requiring a near-180° rotation of the Falkland Island microplate
during break-up, in agreement with previous models. We suggest that global changes in sea level during the mid–late Silurian
and early Devonian strongly influenced changes in the depositional environment. Enhanced erosion of the continental margin
and extensive sediment bypass during the regressive phase of this cycle could help to explain the low abundance of preserved
Gondwanan material of this age.
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Dredging Processes I: The Cutting of Sand, Clay & Rock - Theory
No full textThis book gives an overview of cutting theories. It starts with a generic model, which is valid for all types of soil (sand, clay and rock) after which the specifics of dry sand, water saturated sand, clay, rock and hyperbaric rock are covered. For each soil type small blade angles and large blade angles, resulting in a wedge in front of the blade, are discussed. The failure mechanism of sand, dry and water saturated, is the so called Shear Type. The failure mechanism of clay is the so called Flow Type, but under certain circumstances also the Curling Type and the Tear Type are possible. Rock will usually fail in a brittle way. This can be brittle tensile failure, the Tear Type, for small blade angles, but it can also be brittle shear failure, which is of the Shear Type of failure mechanism for larger blade angles. Under hyperbaric conditions rock may also fail in a more ductile way according to the Flow Type of failure mechanism. For each case considered, the equations/model for the cutting forces, power and specific energy are given. The models are verified with laboratory research, mainly at the Delft University of Technology, but also with data from literature.Marine & Transport TechnologyMechanical, Maritime and Materials Engineerin
Diagnóstico de la productividad de los empleados en Paramédicos S.A.
No full textEl siguiente artículo expone el punto vista sobre los beneficios que puede tener la
compañía PARAMÉDICOS S.A al implementar un método que permita optimizar los
recursos invertidos en el personal y a su vez mejorar el desempeño de los empleados.
PARAMÉDICOS S.A, está conformada por un grupo de profesionales
especializado en el área de imágenes diagnósticas que contribuye al mejoramiento de la salud
humana, mediante la provisión de equipos de imagenologia diagnostica y servicios de salud
de la mano de profesionales altamente calificados, que brindan satisfacción a los clientes.
La compañía se preocupa por el bienestar de sus colaboradores y los incentiva
constantemente por diferentes medios; sin embargo se evidencia un bajo nivel de
productividad, falta de interés y compromiso en sus labores diarias.
PARAMÉDICOS S.A. no cuenta con un método de medición de competencias para
sus funcionarios, por tal razón estudiantes de la universidad Unipanamericana
realizaron una investigación para identificar las posibles causas del bajo desempeño
laboral, con el fin de crear sentido de pertenencia y aumentar la productividad de la
empresa.
Con el análisis de esta investigación exploratoria se evidenció la situación
actual de la compañía; resaltando la importancia de la implementación de planes de
mejora y la definición de procesos; esto con el fin de tener personal altamente
calificado, y así hacer más alcanzables los objetivos propuestos por los directivos
Work among Japanese in the Salt River Valley of Arizona
No full textDocument written by S.A. Stewart Resident Missionary, East Kyushu Distict, Japan Methodist Church. Stewart discusses the events at the church and the free and restricted zones for Japanese Americans living in Glendale and Phoenix, Arizona.The Bishop James Chamberlain Baker Collection includes letters, documents, and articles about Japanese Americans during World War II. Subjects in the collection include Japanese Americans mass removal, Pearl Harbor and the aftermath, religion, and support from the non-Japanese American community. The collection was digitized and made accessible online by CSUDH Gerth Archives and Special Collections
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