Search results for "construction"
showing 10 items of 2670 documents
Improving Image Quality in a multi-plane Compton Telescope for Hadron Therapy Monitoring
2023
Esta disertación explora diferentes técnicas para mejorar la calidad de las imágenes obtenidas con cámaras Compton. Tal mejora es una de las necesidades principales que obstaculizan la aplicación de cámaras Compton como herramientas para la verificación en tiempo real de terapia hadrónica, a través de la obtención de imágenes de distribuciones espaciales de emisión rápida de rayos gamma emitidos como subproductos de las interacciones de estos hadrones en el paciente. Esta aplicación presenta importantes dificultades, pues requiere medir rayos gamma de energías relativamente altas emitidos en un rango de energías amplio y junto a otras partículas no deseadas. Además, la cámara Compton debe s…
Development of Neural Network Prediction Models for the Energy Producibility of a Parabolic Dish: A Comparison with the Analytical Approach
2022
Solar energy is one of the most widely exploited renewable/sustainable resources for electricity generation, with photovoltaic and concentrating solar power technologies at the forefront of research. This study focuses on the development of a neural network prediction model aimed at assessing the energy producibility of dish–Stirling systems, testing the methodology and offering a useful tool to support the design and sizing phases of the system at different installation sites. Employing the open-source platform TensorFlow, two different classes of feedforward neural networks were developed and validated (multilayer perceptron and radial basis function). The absolute novelty of this approac…
Energy and Environmental Assessment of a Hybrid Dish-Stirling Concentrating Solar Power Plant
2022
Although the 2019 global pandemic slowed the growing trend of CO2 concentrations in the atmosphere, it has since resumed its rise, prompting world leaders to accelerate the generation of electricity from renewable sources. The study presented in this paper is focused on the evaluation of the energy and environmental benefits corresponding to the hypothesis of hybridizing a dish-Stirling plant installed on the university campus of Palermo (Italy). These analyses were carried out by means of dynamic simulations based on an accurate energy model validated with the experimental data collected during the measurement campaign that occurred during the period of operation of the reference plant. As…
Les représentations spatiales de concepts scientifiques : inventaire et diversité
1994
The consultation of twelve journals (French and English language) that deal with science education, for the years 1991 to 1993, allowed us to summarize the use of spatial representations of scientific concepts in didactics research. Two main results were produced from this study : there has not been much work published with spatial representations, and what has been published is very heterogeneous. Analysis of this diversity does not always allow us to understand the authors’ objectives and obliges researchers in didactics to think about the nature and role of spatial representations in the construction of scientific knowledge.
Congenital double lip associated to hemangiomas: Report of a case
2004
Submitted by Vitor Silverio Rodrigues (vitorsrodrigues@reitoria.unesp.br) on 2014-05-27T11:21:03Z No. of bitstreams: 0Bitstream added on 2014-05-27T14:33:45Z : No. of bitstreams: 1 2-s2.0-3543121270.pdf: 61328 bytes, checksum: 7b80f6694b9e57340f5311bb4101c338 (MD5) Made available in DSpace on 2014-05-27T11:21:03Z (GMT). No. of bitstreams: 0 Previous issue date: 2004-03-01 Double lip is a developmental abnormality which may occur either isolated or as a component of Ascher's syndrome. A case of congenital double lip associated to hemangiomas and enlargement of the thyroid is reported. The oral and facial hemangiomas were excised under local anesthesia. Surgical reconstruction of the upper li…
Els epítets dels artistes baixmedievals al servei dels poders reial i municipal
2021
Aquest article estudia els adjectius que van rebre els artistes que treballaren per al rei i per a les elits ciutadanes en els territoris de parla catalana durant els segles XIV i XV. En particular, se n’hi examinen dos: apte i subtil. Les notícies exhumades per uns altres especialistes fins al moment permeten comprendre’ls en el propi context documental. Ací es compara el seu significat amb uns altres exemples de la literatura baixmedieval de la Corona d’Aragó i es du a terme una aproximació històrica com a paraules que al·ludien a la perícia de l’artista i que van ser escollides amb una finalitat. Participaren i repercutiren, per tant, en la relació històrica de l’artista amb el client, …
La construction du texte
2015
PV nat; National audience; no abstract
Construction Guilds in Southern Italy and the Islands (15th-16th Centuries): Leadership and Rivalries
2020
In the South of Italy and the big islands, in counter-trend with respect to the rest of the peninsula, construction guilds know a renewed vitality between the last decades of 15th and the beginning of 16th centuries. Rules, prerogatives and operative modes are regulated by statutes, often undersigned by the masters included in the trade organization, mentioning also the other actors involved in the approval processes. The intertwining of these and other archival documents sometimes reveals the leading role played within the guild by masters that overcome the anonymity usually considered to be inherent in the corporate system. Comparing the rules and the boundaries among specific trades esta…
Reducing whole-body vibration exposure in backhoe loaders by education of operators
2012
Author's version of an article published in the journal: International Journal of Industrial Ergonomics. Also available from the publisher at: http://dx.doi.org/10.1016/j.ergon.2012.03.001 Whole-body vibration is a health hazard for operators of construction machinery. The level of whole-body vibration exposure on the operator is governed by three different factors; performance of the suspension system of the machine, planning of the work and the skills of the operator.In this research work it is investigated whether there is a potential in bringing down the level of whole-body vibration exposure by educating operators of backhoe loaders. This is carried out by an experimental setup. Six ex…
Le sens du regard Contribution sémiotique à la technique de l'eye-tracking face aux packagings produits
2009
International audience; This work is presenting a semiotic point of view of a promising but problematic tool of the communication field -eye-tracking- which is used in various fields to track and exploit the eye-path on an object. Drawing form a list of eye-paths on various packagings, the first step of the analysis was the identification without theoretical a priori- of fixed patterns in these paths. Several models can then be inferred on how the order of acquisition of the elements of an image or a pack might have an influence on the construction of their overall meaning.; Ce travail propose un point de vue sémiotique sur un outil du champ de la communication prometteur mais problématique…