Search Results - "Andre, P. S."

Optical Fiber Microcavity Strain Sensors Produced by the Catastrophic Fuse Effect by Antunes, Paulo F. C., Domingues, M. Fatima F., Alberto, Nelia J., Andre, P. S.

“…We present an innovative and cost effective approach to produced sensors based on optical fiber microcavities. The proposed microcavities were manufactured by…”
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Organic–inorganic hybrid materials towards passive and active architectures for the next generation of optical networks by Ferreira, R.A.S., André, P.S., Carlos, L.D.

“…The advances in optoelectronics over the last three decades have been quite dramatic, namely the mass manufacturing of low cost integrated circuits,…”
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Sensing Structure Based on Surface Plasmon Resonance in Chemically Etched Single Mode Optical Fibres by Coelho, L., de Almeida, J. M. M. M., Santos, J. L., Ferreira, R. A. S., André, P. S., Viegas, D.

“…Many optical systems based on surface plasmon resonance (SPR) have been developed for working as refractometers, chemical sensors or even for measuring the…”
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Fabrication of low-cost thermo-optic variable wave plate based on waveguides patterned on di-ureasil hybrids by Vicente, C M S, Lima, P P, Bermudez, V de Zea, Carlos, L D, André, P S, Ferreira, R A S

“…An integrated variable wave plate device based on a thermo-optic (TO) effect was fabricated by patterning a waveguide channel through direct UV laser writing…”
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[INVITED] Luminescent QR codes for smart labelling and sensing by Ramalho, João F.C.B., António, L.C.F., Correia, S.F.H., Fu, L.S., Pinho, A.S., Brites, C.D.S., Carlos, L.D., André, P.S., Ferreira, R.A.S.

“…•Implementation of colour multiplexing strategy to increase the QR codes information capacity.•Green-emitting luminescent QR code based on an organic-inorganic…”
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Elastic constant measurement for standard and photosensitive single mode optical fibres by Antunes, P., Lima, Hugo, Monteiro, Jorge, André, P. S.

“…In this work we determine the elastic constant, the Young modulus, and the strain limit of commercial optical fibers. The fiber rupture limit in standard and…”
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Efficient use of hybrid Genetic Algorithms in the gain optimization of distributed Raman amplifiers by Neto, B, Teixeira, A L J, Wada, N, André, P S

“…In this paper, we propose an efficient and accurate method that combines the Genetic Algorithm (GA) with the Nelder-Mead method in order to obtain the gain…”
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Simplified method for passive optical network in-service fibre-fault monitoring based on fibre Bragg gratings by Sousa, Ana O. P., Marques, C. A. F., Nogueira, R., André, P. S.

“…The fibre-fault monitoring is a crucial network element, especially for passive optical networks. In this work is presented and demonstrated experimentally a…”
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Halting the fuse discharge propagation using optical fiber microwires by Rocha, A M, Fernandes, G, Domingues, F, Niehus, M, Pinto, A N, Facão, M, André, P S

“…We report and analyze the halting of the fuse effect propagation in optical fiber microwires. The increase of the mode field diameter in the tapered region…”
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Monitoring of the concrete curing process using plastic optical fibers by André, P.S., Varum, Humberto, Antunes, Paulo, Ferreira, Licínio, Sousa, M.G.

“…In this paper we propose the application of plastic optical fiber to monitor the concrete curing process. The proposed method is based in the scattering of the…”
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Monitoring of sea bed level changes in nearshore regions using fiber optic sensors by Ferreira, L.F., Antunes, P., Domingues, F., Silva, P.A., André, P.S.

“…This work reports the implementation and test of a pressure optical sensor suitable to measure, in situ, the sea bed level changes in the nearshore regions…”
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Fabrication and optical properties of thin films with sol–gel derived di-ureasils doped with Disperse Red 1 by Vicente, C. M. S., Fu, L., André, P. S., de Zea Bermudez, V., Ferreira, R. A. S.

“…We report the fabrication and the structural and optical characterization of transparent spin coated films (average thickness values of 4.9 ± 0.1 µm) of…”
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Optical filters and resonant cavities based on di-ureasil organic–inorganic hybrids by Vicente, C. M. S., Ferreira, R. A. S., Pecoraro, E., André, P. S., Carlos, L. D.

“…Sol–gel derived poly(oxyethylene)/siloxane organic–inorganic di-ureasil hybrids containing different amounts (20–60% mol) of methacrylic acid (McOH) modified…”
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Revised relativistic basis sets for the 5d elements Hf–Hg by Dyall, Kenneth G., Gomes, Andre S. P.

“…The relativistic double-zeta (dz) and triple-zeta (tz) basis sets for the 5 d elements Hf–Hg have been revised for consistency with the recently optimized 4 f…”
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Thin bonding wires temperature measurement using optical fiber sensors by Antunes, P., Rocha, A.M., Lima, H., Varum, H., André, P.S.

“…In this work we demonstrate the use of optical fiber sensors to measure temperature in thin metallic bonding wires. Temperature was measured in copper wires…”
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Enhanced optical gain clamping for upstream packet based traffic on hybrid WDM/TDM-PON using fiber Bragg grating by Neto, B., Klingler, A., Reis, C., Dionísio, R.P., Nogueira, R.N., Teixeira, A.L.J., André, P.S.

“…In this paper, we propose a method to mitigate the temporal power transients arising from Erbium doped fiber amplifiers (EDFAs) on packeted/bursty scenario…”
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Artificial neural networks for predicting optical conversion efficiency in luminescent solar concentrators by André, P.S., Dias, L.M.S., Correia, S.F.H., Carneiro Neto, A.N., Ferreira, R.A.S.

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Low-Cost Spectrograph Based on a WebCam: A Student Project by Trindade, A., Falcão, B., Carramate, L. F. N. D., Marques, M. I. S. F., Ferreira, R. A. S., André, P. S.

“…This work describes the implementation of a low-cost spectrometer produced with common objects and proposed as a pedagogical students' project. This task aims…”
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Raman amplified access networks with pump signal recycling for electrical power conversion by André, P.S., Lima, M. J. N., Rocha, A. M., Fernandes, N., Granada, M., Almeida, T., Chang, Jin, Lan, Rao, Xiang-Jun, Xin

“…Nowadays, the structure of the passive optical networks is evolving, to keep the network survivability, the powering of some elements in this kind of networks…”
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Uranium() alkyl cations: synthesis, structures, comparison with thorium() analogues, and the influence of arene-coordination on thermal stability and ethylene polymerization activity by Andreychuk, Nicholas R, Vidjayacoumar, Balamurugan, Price, Jeffrey S, Kervazo, Sophie, Peeples, Craig A, Emslie, David J. H, Vallet, Valérie, Gomes, André S. P, Réal, Florent, Schreckenbach, Georg, Ayers, Paul W, Vargas-Baca, Ignacio, Jenkins, Hilary A, Britten, James F

“…Reaction of [(XA 2 )U(CH 2 SiMe 3 ) 2 ] ( 1 ; XA 2 = 4,5-bis(2,6-diisopropylanilido)-2,7-di- tert -butyl-9,9-dimethylxanthene) with 1 equivalent of [Ph 3…”
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