102,275 research outputs found
Efficient optomechanical cooling in one-dimensional interferometers
No full textWe present a scattering model which enables us to describe the mechanical force, including the velocity dependent component, exerted by light on polarizable massive objects in a general one-dimensional optical system. We show that the light field in an interferometer can be very sensitive to the velocity of a moving scatterer. We construct a new efficient cooling scheme, ‘external cavity cooling’, in which the scatterer, that can be an atom or a moving micromirror, is spatially separated from the cavity
A Technique for the Measurement of the Morphological Evolution of Marine Pebbles
No full textThe scope of this paper is to present an innovative methodology for the measurement of the volume evolution of marine pebbles, subject to action of wave motion. This technique is based on the 3D scanning of the pebbles at different stages of the abrasion process, and on the actual measurement of the volume, as well as other ancillary parameters (e.g., the mass) through the use of 3D graphic tools. The 3D scanning of the pebbles is performed using a commercial, low-cost 3D scanner and a mechanical structure which allows the acquisition of the complete pebble morphology. In order to validate the technique, two laboratory tests were performed. In a preliminary test, the 3D model of four pebbles of specific shapes was acquired for a total of 50 times, in order to evaluate the repeatability of the 3D acquisition and then of the volume measurement. The second set of tests was performed using a Los Angeles (LA) tumbling machine, to simulate the natural abrasive process. Then, the 3D models of a number of pebbles were acquired at different stages of the LA machine operative procedure. The results demonstrate the effectiveness of the proposed technique and motivate their usage in a natural environment, that is being carried out in Marina di Pisa, Italy
Photography as a Tool for Industrial Heritage Research, Acknowledge, and Social Engagement. The case study of Anina (Romania)
No full textIn the last 10 – 15 years, a variety of bottom-up initiatives have emerged in Romania as a result of civic action, focusing on the safeguarding and enhancement of cultural heritage despite the lack of legal support and an appropriate national strategy in the field. Such an initiative is also the cultural project “Anina, Mine of Ideas” (2014 – 2018), developed in the former coal-mining town of Anina, south–west Romania. For more than 200 years, spanning from 1773 to 2007, the industry has shaped Anina’s territory and community. Forty-nine objectives are now officially acknowledged for their patrimonial value and included in the List of Historic Monuments and Sites (1992); conversely, an overall strategy for their maintenance and preservation is still lacking. Starting in 2014, various actors of the civic society in collaboration with local administration organised the cultural project “Anina, Mine of Ideas”. For the first time in a Romanian preservation setting, the industrial landscape was approached as a living organism and was decoded in its tangible and intangible manifestations, through an international and interdisciplinary contribution.
Throughout the project, the photographic recording of the industrial landscape played an important role, giving space for experimentation in matters of ‘objective’ and ‘subjective’ research, interpretation and representation of the industrial legacy from a patrimonial perspective while analyzing the impact of the technological upgrade on the overall approach. The difference between an ‘objective’ and ‘subjective’ photographic representation is based on the underlying difference between what is being photographed and how it is being photographed. If the first option brings into debate various digital photographic applications in the field of architectural preservation, the second one reveals the individual and personal perception of what industrial heritage represents.
Furthermore, throughout the project’s activities, photography became a central communication and engagement tool with the local community, breaking the barriers imposed by the rigour of scientific discourse. It allowed specialists to interact directly with the local community and to open a constructive dialogue on issues such as preservation, maintenance, and monitoring of the industrial legacy while generating potential scenarios on territorial and socio-cultural revitalisation through the enhancement of local cultural heritage. The paper will illustrate the various photographic methods used and applied in Anina and the different cultural activities dedicated to the local community in which photography played a significant role. It will analyse how photography facilitated social and cultural engagement with the scientific discourse in a challenging post-industrial setting in which issues such as poverty, social inequality, and isolation dominate the local discourses and narratives
A Technique for the Study of the Volume and Textural Parameter Evolution of Marine Coarse Sediments
No full textIn this article, we detail a novel technique for measuring volume and textural parameters of coarse-grained marine sediments. The technique combines radio frequency identification (RFID) technology for sediment tracking with 3-D scanning for volume measurement. The technique is applied to real marine sediments collected from the beach under study. In the preliminary phase, the sediments are scanned using a low-cost 3-D scanning system and then fitted with an embedded RFID transponder, which allows their unambiguous identification. The pebbles are then deployed on the beach and, after a predefined period of time, they are located and retrieved by means of an ad-hoc RFID reader used as a detector. After retrieval, the pebbles are 3-D scanned to collect data on the volumetric changes that result from the abrasion and chipping processes caused by intergranular friction on their surfaces from water movements (mostly sea waves). The technique allows for an accurate estimation of morphologica..
Bibliographie Hilarion G. Petzold 1958 – 2009 mit Anhang als Einführung
No full textDieses Archiv enthält die Gesamtbibliographie der Werke des Autors nebst einiger Texte „Über H. G. Petzold“ im Schlussteil der Bibliographie sowie einen Anhang mit einer Einführung in die Architektur des Werkes in seinem wissenslogischen Aufbau als Ausarbeitung seines „Tree of Science Modells“ (2007).This archive contains the complete bibliography of the author and some texts about H. G. Petzold, moreover an epilogue with an introduction to the architecture of the works in its epistemological structure and composition and as an elaborations of Petzold’s „Tree of Science Modell (2007).https://www.fpi-publikation.de/polyloge/01-2009-petzold-h-g-gesamtbibliographie-h-g-petzold-1958-2009-updating-november2009/peerReviewedpublishedVersio
Dispelling the Myths Behind First-author Citation Counts
No full textWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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3346: Samuel G. Freedman, author, 2013
No full textPhotograph of author Samuel G. Freedman, at NT Daily Slash meeting in the Mayborn School of Journalism at UNT
The Right to Strike under the United States Constitution: Theory, Practice, and Possible Implications for Canada
No full textAnswering critics of the Canadian Supreme Court's judgment in B.C. Health, the author argues that the Court laid the foundation for a principled and durable doctrine protecting constitutional labour rights, one that goes directly to the heart of the matter — the inequality of workers’ power in the employment relation. In the author’s view, two paths could lead from B.C. Health to the recognition of Charter protec- tion for a right to strike: one that treats the right as an accessory to col- lective bargaining, and one that upholds the right directly on the basis of the Charter values of equality and participation. The author supports the latter approach, contending that constitutional rights should be defined in relation to fundamental values, in a way that is not contingent on time-bound or fact-sensitive assessments about the role of strikes within a particular collective bargaining regime. Although a Charter right to strike may involve the courts in difficult choices about when to defer to legislative policy decisions, and courts may lack the institutional capac- ity to deal effectively with labour law issues, the author points out that judges can look to ILO standards for expert guidance. Noting that the U.S. experience in this area might be of considerable use to Canadians, the author concludes by providing an overview of American case law concerning a constitutional right to strike.Peer reviewe
Activation of amorphous Cu-M (M=Ti, Zr or Hf) alloy powders made by mechanical alloying
No full textAmorphous Cu-M alloy powders (Cu40Ti60, Cu50Zr50 and Cu65Hf35) produced by mechanical alloying are activated by being applied as catalyst in the transformation of various alcohols at elevated temperature (523-573 K). During the dehydrogenation of 2-propanol to acetone and the transformations of allyl alcohol to form propanal and 1-propanol active, stable and selective catalysts are generated from Cu-Zr and Cu-Hf. DSC, XRD and XPS data indicate bulk crystallization and copper segregation to the surface. Due to surface titanium enrichment Cu-Ti proved to be inferior to the other two alloys. (C) 1997 Elsevier Science S.A
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