Improved sensitivity of H.E.S.S.-II through the fifth telescope focus system

The Imaging Atmospheric Cherenkov Telescope (IACT) works by imaging the very short flash of Cherenkov radiation generated by the cascade of relativistic charged particles produced when a TeV gamma ray strikes the atmosphere. This energetic air shower is initiated at an altitude of 10-30 km depending on the energy and the arrival direction of the primary gamma ray. Whether the best image of the shower is obtained by focusing the telescope at infinity and measuring the Cherenkov photon angles or focusing on the central region of the shower is a not obvious question. This is particularly true for large size IACT for which the depth of the field is much smaller. We address this issue in particular with the fifth telescope (CT5) of the High Energy Stereoscopic System (H.E.S.S.); a 28 m dish large size telescope recently entered in operation and sensitive to an energy threshold of tens of GeVs. CT5 is equipped with a focus system, its working principle and the expected effect of focusing depth on the telescope sensitivity at low energies (50-200 GeV) is discussed.Comment: In Proceedings of the 33rd International Cosmic Ray Conference (ICRC2013), Rio de Janeiro (Brazil

A concern visualization approach for improving MATLAB and octave program comprehension

The literature has pointed out the need for focusing efforts to better support comprehension of MATLAB and Octave programs. Despite being largely used in the industry and academia in the engineering domain, programs and routines written in those languages still require efforts to propose approaches and tools for its understanding. Considering the use of crosscutting concerns (CCCs) to support the comprehension of object-oriented programs, there is room of its use in the context of MATLAB and Octave programs. The literature has purpose and examples in this direction. Considering this scenario, we propose the use of visualization enriched with CCCs representation to support the comprehension of such programs. This paper discusses the use of a multiple view interactive environment called OctMiner in the context of two case studies to characterize how collected information relating to crosscutting concerns can foster the comprehension of MATLAB and GNU/Octave programs. As a result of the conducted case studies, we propose strategies based on OctMiner and tailored to support different comprehension activities of programs written in MATLAB and Octave.info:eu-repo/semantics/acceptedVersio

Recuperação Ecológica de Pedreiras no Parque Natural da Arrábida

Entende-se por recuperação ecológica o processo de auxílio ao restabelecimento de um ecossistema que foi degradado, danificado ou destruído,devendo-se assumir a conservação da sua biodiversidade de modo a garantir a possibilidade de retorno à sua trajectória histórica ou à desejada, tornando-o auto-sustentável. É neste contexto, que foram seleccionadas 2 pedreiras do núcleo Achada e Calhariz, das 11 licenciadas no Parque Natural da Arrábida (PNA), onde foram implementados, nas áreas já exploradas, os Planos Ambientais e de Recuperação Paisagística (PARP). No sentido de incentivar a implementação desses planos foi celebrado, em regime de parceria, um protocolo com o objectivo de produção de plantas autóctones (1999-2006) que envolveu a EDP, o INETI (actualmente LNEG), o PNA e os municípios de Setúbal e Palmela. Este protocolo resultou do desenvolvimento do projecto “Valorização de Efluentes Térmicos em Agricultura Protegida”, o qual deu origem à Estação de Propagação de Plantas Autóctones (EPPA) na Central Termoeléctrica de Setúbal (CTS), onde se produziram espécies vegetais autóctones e algumas com estatuto de protecção, que foram utilizadas neste núcleo e em outros planos de outras áreas protegidas e em locais de intervenção do grupo EDP. As espécies para a recuperação, das áreas já exploradas destas pedreiras, foram seleccionadas pelo PNA de acordo com os habitats pré-existentes e que ocorrem nas áreas envolventes para plantação entre 2001-2004 e monitorizadas desde então

Scaffolding MATLAB and octave software comprehension through visualization

Multiple view interactive environments (MVIEs) provide visual resources to support the comprehension of a specific domain dataset. For any domain, different views can be selected and configured in a real time fashion to be better adjusted to the user needs. This paper focuses on the use of a MVIE called OctMiner to support the comprehension of MATLAB and GNU/Octave programs. The authors conducted a case study to characterize the use of OctMiner in the context of comprehension activities. Results provide preliminary evidence of the effectiveness of OctMiner to support the comprehension of programs written in MATLAB and Octave.info:eu-repo/semantics/acceptedVersio

A multiple view interactive environment to support MATLAB and GNU/Octave program comprehension

Program comprehension plays an important role in Software Engineering. In fact, many of the software lifecycle activities depend on program comprehension. Despite the importance of MATLAB and Octave programing languages in the Engineering and Statistical communities, little attention has been paid to the conception, implementation and characterization of tools and techniques for the comprehension of programs written in these languages. Considering this scenario, this paper presents a Multiple View Interactive Environment (MVIE) called OctMiner that supports the comprehension of programs developed in the aforementioned languages. OctMiner provides a set of coordinated visual metaphors that can be adjusted in accordance with the comprehension goals. An example is presented to illustrate the main functionalities of OctMiner in a real scenario of program comprehension.info:eu-repo/semantics/acceptedVersio

Preliminary analysis of the drive system of the CTA LST Telescope and its integration in the whole PLC architecture

This work aims to present a preliminary analysis of the drive system configuration for the CTA telescopes array and more specifically a possible architecture for the sub-array of Large Size Telescopes - LSTs. The first part of this document is focused on the control command architecture of the drive system dedicated to the LST including a view on some mechanical aspects concerning the telescopes of this class. In particular the current investigation on the interfaces between the drive system and the automatic system in charge of the camera mast control system (e.g. the arch damping) is presented. In the second part of this work the issue of the integration of the telescope drive system within a global PLC (Programmable Logic Controller) architecture for the CTA array is addressed with the corresponding links to the control software layer

On the use of a multiple view interactive environment for MATLAB and octave program comprehension

WOS:000364988500049 (Nº de Acesso Web of Science)MATLAB or GNU/Octave programs can become very large and complex and therefore difficult to understand and maintain. The objective of this paper is presenting an approach to mitigate this problem, based upon a multiple view interactive environment (MVIE) called OctMiner. The latter provides visual resources to support program comprehension, namely the selection and configuration of several views to meet developers’ needs. For validation purposes, the authors conducted two case studies to characterize the use of OctMiner in the context of software comprehension activities. The results provided initial evidences of its effectiveness to support the comprehension of programs written in the aforementioned languages