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Publicações

2016

The statistics of atmospheric turbulence at Maunakea measured by RAVEN

Autores
Ono, YH; Correia, CM; Lardière, O; Andersen, DR; Oya, S; Akiyama, M; Gamroth, D; Jackson, K; Martin, O; Guesalaga, A; Bradley, C;

Publicação
ADAPTIVE OPTICS SYSTEMS V

Abstract
Prior statistical knowledge of the turbulence such as turbulence strength, layer altitudes and the outer scale is essential for atmospheric tomography in adaptive-optics (AO). These atmospheric parameters can be estimated from measurements of multiple Shack-Hartmann wave-front sensors (SH-WFSs) by the SLOpe Detection And Ranging (SLODAR). In this paper, we present the statistics of the vertical CN2 and the outer scale L0 at Maunakea in Hawaii estimated from 60 hours telemetry data in total from multiple SH-WFSs of RAVEN, which is an on-sky multi-object AO demonstrator tested on the Subaru telescope. The mean seeing during the RAVEN on-sky observations is 0.475 arcsec, and 55% turbulence is below 1.5 km. The vertical profile of CN2 from the RAVEN SLODAR is consistent with the profiles from CFHT DIMM and MASS, and TMT site characterization.

2016

Treatment of crystallized-fruit wastewater by UV-A LED photo-Fenton and coagulation flocculation

Autores
Rodriguez Chueca, J; Amor, C; Fernandes, JR; Tavares, PB; Lucas, MS; Peres, JA;

Publicação
CHEMOSPHERE

Abstract
This work reports the treatment of crystallized-fruit effluents, characterized by a very low biodegradability (BOD5/COD <0.19), through the application of a UV-A LED photo-Fenton process. Firstly, a Box-Behnken design of Response Surface Methodology was applied to achieve the optimal conditions for the UV-A LED photo-Fenton process, trying to maximize the efficiency by saving chemicals and time. Under the optimal conditions ([H2O2] = 5459 mg/L; [Fe3+]= 286 mg/L; time >180 min), a COD removal of 45, 64 and 74% was achieved after 360 min, using an irradiance of 23, 70 and 85 W/m(2) respectively. Then a combination of UV-A LED photo-Fenton with coagulation flocculation decantation attained a higher COD removal (80%), as well as almost total removal of turbidity (99%) and total suspended solids (95%). Subsequent biodegradability of treated effluents increased, allowing the application of a biological treatment step after the photochemical/CFD with 85 W/m(2).

2016

Barriers and Critical Success Factors in E-Health Information Technology

Autores
Almeida, F; Monteiro, J; Lousã, M;

Publicação
Encyclopedia of E-Health and Telemedicine

Abstract

2016

Optimization of Electricity Markets Participation with Simulated Annealing

Autores
Faia, R; Pinto, T; Vale, ZA;

Publicação
Trends in Practical Applications of Scalable Multi-Agent Systems, the PAAMS Collection, 14th International Conference, PAAMS 2016, Sevilla, Spain, June 1-3, 2016, Special Sessions.

Abstract

2016

Vanishing scares: biofeedback modulation of affective player experiences in a procedural horror game

Autores
Nogueira, PA; Torres, V; Rodrigues, R; Oliveira, E; Nacke, LE;

Publicação
JOURNAL ON MULTIMODAL USER INTERFACES

Abstract
To understand the impact of emotionally driven games on player experience, we developed a procedural horror game (Vanish) capable of run-time level, asset, and event generation. Vanish was augmented to interpret players' physiological data as a simplified emotional state, mapping it to a set of adaptation rules that modify the player experience. To explore the effects of adaptation mechanisms on player experience, we conducted a mixed-methods study on three different versions of the game, two of which integrated varying biofeedback mechanisms. Players' affective experiences were objectively measured by analysing physiological data. Additionally, subjective experience was recorded through the use of the Game Experience Questionnaire. Our study confirmed that biofeedback functionality had a statistically significant effect on the ratings of player experience dimensions: immersion, tension, positive affect, and negative affect. Furthermore, participants reported noticeable differences in player experience, favouring the added depth present in the biofeedback-enabled iterations of the game. In the future, these conclusions will help to develop more immersive and engaging player experiences.

2016

Estimating Phase Errors from Pupil Discontinuities from Simulated On Sky Data: Examples with VLT and Keck

Autores
Lamb M.; Correia C.; Sauvage J.F.; Andersen D.; Vigan A.; Wizinowich P.; Van Dam M.; Mugnier L.; Bond C.;

Publicação
ADAPTIVE OPTICS SYSTEMS V

Abstract
We propose and apply two methods for estimating phase discontinuities for two realistic scenarios on VLT and Keck. The methods use both phase diversity and a form of image sharpening. For the case of VLT, we simulate the 'low wind effect' (LWE) which is responsible for focal plane errors in low wind and good seeing conditions. We successfully estimate the LWE using both methods, and show that using both methods both independently and together yields promising results. We also show the use of single image phase diversity in the LWE estimation, and show that it too yields promising results. Finally, we simulate segmented piston effects on Keck/NIRC2 images and successfully recover the induced phase errors using single image phase diversity. We also show that on Keck we can estimate both the segmented piston errors and any Zernike modes affiliated with the non-common path.

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