106 research outputs found
On an arrow nock from Viminacium: Contribution to the study of Roman archery equipment in Serbia
No full textRad je posvećen nalazu sa lokaliteta Pećine na Viminacijumu nađenom u ukopu u obliku bunara koji je opredeljen kao grob (G 1 295). Predmet je izrađen od životinjske kosti i sastoji se od cilindričnog tela u kome je usečen žljeb u obliku latiničnog slova V i nastavka u vidu dužeg trna kružnog preseka. Iako je predmet prvobitno okarakterisan kao čivija ili ključ za štimovanje žičanog instrumena (lire) autor utvrđuje da se zapravo radi o delu streljačke opreme, odnosno "jahaču tetive" ili noku koji je nekada bio usađen na zadnjem delu tela strele od trske. Koštani nok sa Viminacijuma, do danas jedini takav nalaz iz Srbije, datovan je na osnovu stratigrafije i pratećih nalaza iz sloja u period početka III veka.This paper is dedicated to the find uncovered in a Roman well identified as a grave (G 1 295) from the locality Pećine at Viminacium (Serbia). The object is made of animal bone and has a cylindrical body with a V shaped notch carved on the back end. The body continues in the form of a narrow and long pin with circular cross-section. The object was originally published as a tuning peg (key) for string instrument (lyre), however, the author con cludes that it actually represents a piece of archery equipment, that is, a nock that was once implanted on the back of the arrow shaft made of reed. Based on the stratigraphy and other finds from the same layer, the bone nock from Viminacium, up to date the only such find in Serbia, is dated in the beginning of the 3 rd century AD
The Integration of Coastal Flooding into an ArcFLOOD Data Model
No full textWith the impact of global climate change, the speedy, intelligent and accessible dissemination of coastal flood predictions from a number of modelling tools at a range of temporal and spatial scales becomes increasingly important for policy decision makers. This thesis provides a novel approach to integrate the coastal flood data into an ArcFLOOD data model to improve the analysis, assessment and mitigation of the potential flood risk in coastal zones. This novel methodology has improved the accessibility, dissemination and visualisation of coastal flood risk. The results were condensed into spatial information flows, data model schematic diagrams and XML schema for end-user extension, customisation and spatial analysis. More importantly, software developers with these applications can now develop rich internet applications with little knowledge of numerical flood modelling systems. Specifically, this work has developed a coastal flooding geodatabase based upon the amalgamation, reconditioning and analysis of numerical flood modelling. In this research, a distinct lack of Geographic Information Systems (GIS) data modelling for coastal flooding prediction was identified in the literature. A schema was developed to provide the linkage between numerical flood modelling, flood risk assessment and information technology (IT) by extending the ESRI ArcGIS Marine Data Model (MDM) to include coastal flooding. The results of a linked hybrid hydrodynamic-morphological numerical flood model were used to define the time-series representation of a coastal flood in the schema. The results generated from GIS spatial analyses have improved the interpretation of numerical flood modelling output by effectively mapping the flood risk in the study site, with an improved definition according to the time-series duration of a flood. The improved results include flood water depth at a point and flood water increase which equates to the difference in significant wave height for each time step of coastal flooding. The flood risk mapping provided has indicated the potential risk to infrastructure and property and depicted the failure of flood defence structures. In the wider context, the results have been provided to allow knowledge transfer to a range of coastal flooding end-users
America's Upside-down Doctrine of Education: Albert Jay Nock's Theory of What Has Gone Wrong — Or Is It Right?
No full textThe American system of education makes important and sometimes unjustified assumptions that were questioned and criticized nearly a hundred years ago by author and educational theorist Albert Jay Nock. This essay discusses Nock’s theory of American education and finds that certain of these assumptions stand greatly in need of the support of evidence
America's Upside-down Doctrine of Education: Albert Jay Nock's Theory of What Has Gone Wrong — Or Is It Right?
No full textThe American system of education makes important and sometimes unjustified assumptions that were questioned and criticized nearly a hundred years ago by author and educational theorist Albert Jay Nock. This essay discusses Nock’s theory of American education and finds that certain of these assumptions stand greatly in need of the support of evidence
Music for classical guitar by South African composers : a historical survey, notes on selected works and a general catalogue
No full textIncludes abstract.Includes bibliographical references (leaves 296-309).This is the first comprehensive investigation of music for, or including, the classical guitar by South African composers. The focus of this research has been, firstly, to uncover as much of the repertoire as possible, and, secondly, to collate, study, catalogue and report on the information. A brief historical survey of the guitar in South Africa provides the context within which this study was conducted. The primary sources of quantitative data collection were through the archival catalogues of the South African Music Rights Organisation and through personal contact with guitarists, composers and guitar teachers. Other sources consulted were publishers, broadcasting corporations, recording companies, libraries and the internet. The body of the dissertation comprises biographical sketches, background notes, analyses and technical notes on 17 selected solo and chamber works dating from 1947 to 2007 by some of South Africa's most prominent composers and guitaristcomposers. The repertoire ranges in style from the traditional and ethnically inspired to the experimental and abstract. As this is an empirical survey, each selected entry includes details on instrumentation, duration, level of difficulty, number of pages, scordatura, commissions or requests, sources or publishers, premières and recordings. A biography of each composer is provided as well as background notes which offer an overview of the selected work. The notes discuss historical, cultural, musical and extra-musical influences, and frequently include references to interview material. The commentaries on the selected works, with musical examples, include an analytical component describing structure, form, stylistic and compositional elements, while the technical observations include performance suggestions and a grading for each work
Developing an Optical Microlever for Stable and Unsupported Force Amplification
No full textOptical micromachines have the potential to improve the capabilities of optical tweezers by amplifying forces and allowing for indirect handling and probing of specimens. However, systematic design and testing of micromachine performance is still an emerging field. In this work we have designed and tested an unsupported microlever, suitable for general-purpose optical tweezer studies, that demonstrates stable trapping performance and repeatable doubling of applied forces. Stable trapping was ensured by analysing images to monitor focus shift when levers oscillated repeatedly, before the best-performing design was selected for force amplification. This study also shows that direct measurement of trap stiffness using the equipartition theorem appears to be a valid method for measuring applied forces on the spherical handles of microlevers.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Team Carlas SmithMicro and Nano Engineerin
Comparison of hydraulic conductivity calculated from geophysical logs, aquifer tests, and grain-size distribution at SAWS Aquifer Storage and Recovery Site, Bexar County, Texas
No full textThe author has granted permission for their work to be available to the general public.San Antonio Water System (SAWS) operates an Aquifer Storage and Recovery (ASR) facility that is developed within an interval of a 'massive sand' of the Carrizo aquifer on a 3,200 acre site in southern Bexar County, Texas. Spatial variations in hydraulic conductivity reflect heterogeneity in the physical properties of the aquifer that could affect the recharge, movement, storage, and recovery of water at the site. Several independent estimates of hydraulic conductivity at various wells were made from nuclear magnetic resonance (NMR), resistivity, and porosity geophysical logs. Estimates of hydraulic conductivity from well tests and from Kozeny-Carman-equation calculations, which used grain-size-distribution data from partial core recovery, provide a comparison to the geophysical-log interpretations.Geoscience
Thackery's Lexicon to Josephus
No full textThe death of Dr. Henry St. John Thackeray in June 1929 was a great grief to his many friends on both sides of the Atlantic. As a man and as a scholar he had rare and admirable qualities, and it is typical of him both as a man and as a scholar that when he undertook to make a translation of Josephus, of which four volumes have already appeared in the Loeb Classical Library, he first prepared a special lexicon for his own guidance, with no thought of printing it. The wise liberality of the Alexander Kohut Memorial Publication Fund, to which the work was introduced by Professor Cadbury, has now made possible the present publication, which has a form worthy of its contents. The first fascicule was seen through the press by its author, and arrangements have been made for the completion of the enterprise. It is of uncommon excellence.</jats:p
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