249 research outputs found
Signatures, stamps and ex libris: evolution of indications of property in the library of the Argentine Humanist Pedro N. Arata
No full textEste artículo analiza en profundidad las firmas, sellos y ex libris mediante los cuales Pedro N. Arata identificó los libros de su colección personal, actualmente en la Biblioteca Arata de la Facultad de Agronomía de la Universidad de Buenos Aires. El examen de esas evidencias permite al autor trazar también una aproximación a la biografía intelectual del propio Arata.The article studies signatures, seals and ex libris used by Pedro N. Arata to identify the books belonging to his personal collection, kept today at the Arata library of the Faculty of Agrarian Sciences, University of Buenos Aires. The analysis of these traces further allows the author to outline an intellectual biography of Arata.Fil: Medan, Diego. Universidad de Buenos Aires. Facultad de Agronomia; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin
Effect of neutron irradiation on Nb3Sn wire
No full text0000-0002-2961-4212A Nb3Sn wire which was manufactured for the ITER toroidal field coil conductor by a bronze route process was prepared for this study to investigate the effect of neutron irradiation on the critical current in a high magnetic field. The critical current of the virgin wire was measured in liquid helium with a 28 T hybrid superconducting magnet at the High Field Laboratory for Superconducting Materials in Tohoku University. It was also measured in vacuum with a heat conduction type variable temperature insert (VTI) at the International Research Center for Nuclear Materials Science at Tohoku University. The wire was irradiated at below 100 °C by fission neutrons at up to 4.9 × 1022 neutrons m−2 (>0.1 MeV) at BR2 in Belgium, and the critical current after the irradiation was evaluated with a VTI in the range of 8–15.5 T. The difference of the critical current measured with two facilities was discussed, focussing on Joule heating of the sample holder which was made of pure copper, and the neutron irradiation effect on the critical current was investigated in the range of up to 15.5 T. The results show that the critical current measured in vacuum becomes lower than that in liquid helium because of the temperature rise of the sample holder where the sample was soldered, the critical current was increased by the neutron irradiation, and the current ratio (IC/IC0) was almost constant of 1.75 in the range of 8–15.5 T at around 4 K.journal articl
Reappraising the Visionary Work of Arata Isozaki: Six Decades and Four Phases
No full textThis article analyses the work and presents a portrait of Japanese architect Arata Isozaki. His designs and buildings span six decades and it is suggested that these can be categorised into four distinctively different phases. As a former collaborator of Isozaki during the 1990s, the author is able to draw from first-hand observations and knowledge to explain relevant projects. As the discussion points out, Isozaki’s work is highly unusual, original, complex and personal in its absorption of a multitude of influences and its interdisciplinary approach; thus, one could say that he has created ideas and concepts for spaces that defy characterisation as belonging to any single school of thought
Several Considerations on Construction Site of Fusion DEMO
No full textA fusion reactor is a human dream aiming to realize a terrestrial sun. The ITER project has been running for over ten years to create D-T burning plasma. Since a fusion DEMO design started within a framework of all-Japan system newly established in Japan, the construction site of the fusion DEMO must be investigated based on the discussions which have been performed for a long time in wide engineering fields. Some of the requirements to the site selection are discussed and summarized. The discussions are mainly focused on infrastructure which will be required to the construction site and very long timespan has been imaged from the construction to the site close after the D-T burning plasma operations. The plasma parameters and the in-vessel systems like the blanket and the diverter will not be discussed and the reactor type, such as Tokamak or Helical, is not concerned severely.journal articl
Movement Behaviour of Traditionally Managed Cattle in the Eastern Province of Zambia Captured Using Two-Dimensional Motion Sensors
No full textTwo-dimensional motion sensors use electronic accelerometers to record the lying, standing and walking activity of cattle. Movement behaviour data collected automatically using these sensors over prolonged periods of time could be of use to stakeholders making management and disease control decisions in rural sub-Saharan Africa leading to potential improvements in animal health and production. Motion sensors were used in this study with the aim of monitoring and quantifying the movement behaviour of traditionally managed Angoni cattle in Petauke District in the Eastern Province of Zambia. This study was designed to assess whether motion sensors were suitable for use on traditionally managed cattle in two veterinary camps in Petauke District in the Eastern Province of Zambia. In each veterinary camp, twenty cattle were selected for study. Each animal had a motion sensor placed on its hind leg to continuously measure and record its movement behaviour over a two week period. Analysing the sensor data using principal components analysis (PCA) revealed that the majority of variability in behaviour among studied cattle could be attributed to their behaviour at night and in the morning. The behaviour at night was markedly different between veterinary camps; while differences in the morning appeared to reflect varying behaviour across all animals. The study results validate the use of such motion sensors in the chosen setting and highlight the importance of appropriate data summarisation techniques to adequately describe and compare animal movement behaviours if association to other factors, such as location, breed or health status are to be assessed.</p
Can You Fool AI by Doing a 180? \unicode{x2013} A Case Study on Authorship Analysis of Texts by Arata Osada
No full textThis paper is our attempt at answering a twofold question covering the areas
of ethics and authorship analysis. Firstly, since the methods used for
performing authorship analysis imply that an author can be recognized by the
content he or she creates, we were interested in finding out whether it would
be possible for an author identification system to correctly attribute works to
authors if in the course of years they have undergone a major psychological
transition. Secondly, and from the point of view of the evolution of an
author's ethical values, we checked what it would mean if the authorship
attribution system encounters difficulties in detecting single authorship. We
set out to answer those questions through performing a binary authorship
analysis task using a text classifier based on a pre-trained transformer model
and a baseline method relying on conventional similarity metrics. For the test
set, we chose works of Arata Osada, a Japanese educator and specialist in the
history of education, with half of them being books written before the World
War II and another half in the 1950s, in between which he underwent a
transformation in terms of political opinions. As a result, we were able to
confirm that in the case of texts authored by Arata Osada in a time span of
more than 10 years, while the classification accuracy drops by a large margin
and is substantially lower than for texts by other non-fiction writers,
confidence scores of the predictions remain at a similar level as in the case
of a shorter time span, indicating that the classifier was in many instances
tricked into deciding that texts written over a time span of multiple years
were actually written by two different people, which in turn leads us to
believe that such a change can affect authorship analysis, and that historical
events have great impact on a person's ethical outlook as expressed in their
writings
Study on Butt Weld Joint of Thick Plate Superconducting Coil Structure to Reduce Welding Residual Deformation
No full textIn a large fusion experimental device, the magnetic field in the coil is rather high to create higher magnetic field at the plasma center, and the coil current is very large resulting in generation of huge electromagnetic force. To sustain such huge electromagnetic force, thick section components are required for the coil structure of which material is generally an austenitic stainless steel to avoid magnetization. On the process of the welding design, the welding residual deformation must be taken into account to keep the position of the current center of the coil and to avoid the degradation of the superconducting conductor by the excessive welding residual strain. In this paper, a partial welding which was used for the LHD construction will be focused and the image of the conceptual welding design of ITER TF coil butt joints will be discussed for an example of the fusion application.journal articl
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