2016
Authors
Thatte, NAA; Clarke, F; Bryson, I; Schnetler, H; Tecza, M; Fusco, T; Bacon, RM; Richard, J; Mediavilla, E; Neichel, B; Arribas, S; García Lorenzo, B; Evans, CJ; Remillieux, A; El Madi, K; Herreros, JM; Melotte, D; O'Brien, K; Tosh, IA; Vernet, J; Hammersley, P; Ives, DJ; Finger, G; Houghton, R; Rigopoulou, D; Lynn, JD; Allen, JR; Zieleniewski, SD; Kendrew, S; Ferraro Wood, V; Pécontal Rousset, A; Kosmalski, J; Laurent, F; Loupias, M; Piqueras, L; Renault, E; Blaizot, J; Daguisé, E; Migniau, JE; Jarno, A; Bornh, A; Gallie, AM; Montgomery, DM; Henry, D; Schwartz, N; Taylor, W; Zins, G; Rodríguez Ramos, LF; Cagigas, M; Battaglia, G; López, RR; Revuelta, JSC; Rasilla, JL; Hernández Suárez, E; Gigante Ripoll, JV; López, JP; Martin, MV; Correia, C; Pascal, S; Blanco, L; Vola, P; Epinat, B; Peroux, C; Vigan, A; Dohlen, K; Sauvage, JF; Lee, M; Carlotti, A; Verinaud, C; Morris, T; Myers, R; Reeves, A; Swinbank, M; Calcines, A; Larrieu, M;
Publication
GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY VI
Abstract
HARMONI is the E-ELT's first light visible and near-infrared integral field spectrograph. It will provide four different spatial scales, ranging from coarse spaxels of 60 × 30 mas best suited for seeing limited observations, to 4 mas spaxels that Nyquist sample the diffraction limited point spread function of the E-ELT at near-infrared wavelengths. Each spaxel scale may be combined with eleven spectral settings, that provide a range of spectral resolving powers (R ~3500, 7500 and 20000) and instantaneous wavelength coverage spanning the 0.5 - 2.4 µm wavelength range of the instrument. In autumn 2015, the HARMONI project started the Preliminary Design Phase, following signature of the contract to design, build, test and commission the instrument, signed between the European Southern Observatory and the UK Science and Technology Facilities Council. Crucially, the contract also includes the preliminary design of the HARMONI Laser Tomographic Adaptive Optics system. The instrument's technical specifications were finalized in the period leading up to contract signature. In this paper, we report on the first activity carried out during preliminary design, defining the baseline architecture for the system, and the trade-off studies leading up to the choice of baseline.
2016
Authors
Fonte, PM; Monteiro, C; Barbosa, FM;
Publication
2016 13TH INTERNATIONAL CONFERENCE ON THE EUROPEAN ENERGY MARKET (EEM)
Abstract
This paper analyzes a real case study based on an islanding power grid, where there is wind power curtailment during the grid operation. This curtailment skews the wind power production database creating a huge challenge to the overall power production forecast. Thus, it is presented a solution which has allowed more accurate forecasts in order to improve the renewable production and reduce the fuel consumption in thermal power plants. The proposed filtering approach demonstrated to be a good solution allowing wind power forecasts with less error and net load forecasts with more accuracy.
2016
Authors
Teixeira, AAC; Bezerra, L;
Publication
RBGN-REVISTA BRASILEIRA DE GESTAO DE NEGOCIOS
Abstract
Purpose - The present paper adds to the most recent current of literature that highlights the importance of innovation in services, analyzing a setting - Portugal - which is relatively backward in terms of innovation performance. Design/methodology/approach - Based on a sample of 4128 companies (including 1489 service companies) that answered the Community Innovation Survey 2008, we assessed, by resorting to logistic regressions, the determinants of innovation performance in Portuguese companies. Findings - 1) Workers who have the 1st cycle of higher education have a positive and significant impact on the innovation of service companies whereas PhDs are detrimental to companies' innovative performance; 2) Companies in the service sector in general, and in KIBS in particular, that effectively invest in external and (continuous) internal R&D activities are more innovative; 3) External scientific sources of information for innovation are crucial (and much more than in manufacturing) to the innovation performance of service companies, especially of KIBS; 4) Similarly to manufacturing, participation in innovation activities in cooperation with foreign partners appears as a key factor in the innovative performance of service companies. Originality/value - The study demonstrates the influence of companies' openness and the relative importance attributed to different sources of information for innovation on innovation outcomes of service companies (and KIBS) compared to manufacturing industries.
2016
Authors
Rodrigues Ribeiro, RSR; Guerreiro, A; Viegas, J; Jorge, PAS;
Publication
SIXTH EUROPEAN WORKSHOP ON OPTICAL FIBRE SENSORS
Abstract
In this work, spiral phase lenses and Fresnel zone lenses for beam tailoring, fabricated on the tip of optical fibers, are reported. The spiral phase lenses allow tailoring the fundamental guided mode, a Gaussian beam, into a Laguerre - Gaussian profile without using additional optical elements. Whereas, the Fresnel lenses are used as focusing systems. The lenses are fabricated using Focused Ion Beam milling, enabling high resolution in the manufacturing process. The output optical intensity profiles matching the numerical simulations are presented and analyzed.
2016
Authors
Costa, T; Leal, JP;
Publication
SLATE
Abstract
The goal of the semantic measures is to compare pairs of concepts, words, sentences or named entities. Their categorization depends on what they measure. If a measure only considers taxonomy relationships is a similarity measure; if it considers all type of relationships it is a relatedness measure. The evaluation process of these measures usually relies on semantic gold standards. These datasets, with several pairs of words with a rating assigned by persons, are used to assess how well a semantic measure performs. There are a few frameworks that provide tools to compute and analyze several well-known measures. This paper presents a novel tool - SMComp - a testbed designed for path-based semantic measures. At its current state, it is a domain-specific tool using three different versions of WordNet. SMComp has two views: one to compute semantic measures of a pair of words and another to assess a semantic measure using a dataset. On the first view, it offers several measures described in the literature as well as the possibility of creating a new measure, by introducing Java code snippets on the GUI. The other view offers a large set of semantic benchmarks to use in the assessment process. It also offers the possibility of uploading a custom dataset to be used in the assessment.
2016
Authors
Schwartz, N; Sauvage, JF; Neichel, B; Correia, C; Blanco, L; Fusco, T; Pecontal Rousset, A; Jarno, A; Piqueras, L; Dohlen, K; El Hadi, K; Thatte, N; Bryson, I; Clarke, F; Schnetler, H;
Publication
ADAPTIVE OPTICS SYSTEMS V
Abstract
HARMONI is a visible and near-infrared integral field spectrograph designed to be a first-light instrument on the European extremely large telescope. It will use both single-conjugate and laser tomographic adaptive optics to fully exploit high-performance and sky coverage. Using a fast AO modelling toolbox, we simulate anisoplanatism effects on the point spread function of the single-conjugate adaptive optics of HARMONI. We investigate the degradation of the correction performance with respect to the off-Axis distance in terms of Strehl ratio and ensquared energy. In addition, we analyse what impact the natural guide source magnitude, AO sampling frequency and number of sub-Apertures have on performance. We show, in addition to the expected PSF degradation with the field direction, that the PSF retains a coherent core even at large off-Axis distances. We demonstrated the large performance improvement of fine tuning the sampling frequency for dimer natural guide stars and an improvement of approx. 50% in SR can be reached above the nominal case. We show that using a smaller AO system with only 20x20 sub-Apertures it is possible to further increase performance and maintain equivalent performance even for large off-Axis angles.
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