14 documents found, page 1 of 2
Validation of the Aquanex system to assess in-water forces during aquatic exercise
Santos, Catarina; Costa, Mário; Almeida, Daniel; Garrido, Nuno; Barbosa, Tiago; Rosa, SérgioThe aim of this study was to perform a validation of the Aquanex system to assess in-water forces during aquatic exercise. One sensor (Type A) that composes the differential pressure system (Aquanex v.4.1, STR, USA) was placed inside a wind tunnel (Axial Propellor Fan, England), this last being considered as the gold standard technique for measurement. A frequency inverter was used to control a range of twenty-...
Grating coupler design for low-cost fabrication in amorphous silicon photonic i...
Almeida, Daniel; Lourenço, Paulo; Fantoni, Alessandro; Costa, João; Vieira, ManuelaPhotonic circuits find applications in biomedicine, manufacturing, quantum computing and communications. Photonic waveguides are crucial components, typically having cross-section orders of magnitude inferior when compared with other photonic components (e.g., optical fibers, light sources and photodetectors). Several light-coupling methods exist, consisting of either on-plane (e.g., adiabatic and end-fire coup...
Multi-micron dimensioning of amorphous silicon rib waveguides
Almeida, Daniel; Costa, João; Fantoni, Alessandro; Vieira, ManuelaWhile silicon photonics is considered as the key technology for future applications in optical transceivers, ASICs and sensing devices, there are still challenges to achieve generalized mass production of Photonic Integrated Circuits (PICs). One obstacle is the required extreme miniaturization of the photonic devices. Nevertheless, there is space for applications with equal interest and impact in the society th...
Silicon nitride interferometers for optical sensing with multi-micron dimensions
Costa, João; Almeida, Daniel; Fantoni, Alessandro; Lourenço, Paulo; Vieira, ManuelaIncreasing the size of the smallest features of Photonic Integrated Circuits (PICs) to multi-micron dimensions can be advantageous to avoid expensive and complex lithographic steps in the fabrication process. In applications where extremely reduced chip size is not a requirement, the design of devices with multi-micron dimensions is potential interesting to avoid the need for e-beam lithography. Another benefit...
BGP Report: Ferramenta para visualização de anúncios BGP
Almeida, DanielSubmitted by Aline Rezende (alinerezende@upf.br) on 2021-12-15T18:20:16Z No. of bitstreams: 1 PF2021Daniel Almeida Cruz da Cunha.pdf: 506183 bytes, checksum: 4035a22de588533a6a9f4037251a6811 (MD5); Made available in DSpace on 2021-12-15T18:20:16Z (GMT). No. of bitstreams: 1 PF2021Daniel Almeida Cruz da Cunha.pdf: 506183 bytes, checksum: 4035a22de588533a6a9f4037251a6811 (MD5) Previous issue date: 2021-07-07; O B...
Microperimetry as Part of Multimodal Assessment to Evaluate and Monitor Myopic ...
Baptista, Pedro Manuel; Silva, Nisa; Coelho, João; José, Diana; Almeida, Daniel; Meireles, AngelinaPurpose: To characterize a population of high myopes with myopic traction maculopathy (MTM), to assess their retinal function, and to correlate it with anatomic status. Patients and methods: This was an observational cross-sectional study including 50 eyes from 27 patients. Demographic and clinical data were analyzed. Macular structure was assessed with spectral domain optical coherence tomography (SD-OCT, Heid...
Intense Pulsed Plus Low-Level Light Therapy in Meibomian Gland Dysfunction
Marta, Ana; Baptista, Pedro Manuel; Marques, Joao Heitor; Almeida, Daniel; José, Diana; Sousa, Paulo; Barbosa, IrenePurpose: To analyse the clinical outcome in patients with meibomian gland dysfunction (MGD) who underwent intense pulsed light (IPL) plus low-level light therapy (LLL). Materials and methods: The prospective non-comparative study included identified by MGD patients with altered interferometry and lower loss area of the meibomian glands (LAMG), who underwent IPL plus LLL, between July 2020 and August 2020. A mul...
Long-Term Visual Function Effects of Pan-Retinal Photocoagulation in Diabetic R...
Baptista, Pedro Manuel; Marta, Ana; Marques, Joao Heitor; José, Diana; Almeida, Daniel; Ribeiro, António; Barbosa, IrenePurpose: To address the long-term visual function after bilateral pan-retinal photocoagulation (PRP) and its impact in real life, namely on visual field (VF) legal criteria to drive. To determine potential predictors related to clinical factors and treatment strategies. Patients and methods: Observational cross-sectional study. Eyes from diabetic patients diagnosed with diabetic retinopathy who underwent bilate...
Keratoconus and Visual Performance with Different Contact Lenses
Marta, Ana; Marques, Joao Heitor; Almeida, Daniel; José, Diana; Barbosa, IrenePurpose: To analyze the visual performance in contact lens wearers with keratoconus. Methods: A retrospective study including contact lens (CL) wearers was performed. The current best-corrected visual acuity with contact lens (BCVA-CL) and with spectacles (BCVA-S) correction, contrast sensitivity (CS) (by Metrovision-MonPack3®), analysis of light scattering in the retina and vision break-up time (HD Analyzer®),...
ECG simulator with configurable skin-electrode impedance and artifacts emulation
Almeida, Daniel; Costa, João; Lourenço, AndréElectrocardiograms (ECG) recorded from everyday objects, such as wearables, fitness machines or smart steering wheels are becoming increasingly common. Applications are diverse and include health monitoring, athletic performance optimization, identification, authentication, and entertainment. In this study we report the design and implementation of an innovative ECG simulator, providing simulation of signal rel...