2021
Authors
Cardoso, MP; Silva, AO; Romeiro, AF; Giraldi, MTR; Costa, JCWA; Santos, JL; Baptista, JM; Guerreiro, A;
Publication
IEEE INSTRUMENTATION & MEASUREMENT MAGAZINE
Abstract
Surface plasmon-polaritons are electromagnetic modes that can be excited at a conducting-dielec-tric interface [1]. The engineering of surface plasmon resonance (SPR) based devices is a milestone in the development of optical sensors. The ability to construct an all-optical system to confine lightwave power at subwavelength dimensions with higher levels of sensitivity and resolution in a broad spectral range are the central features that have attracted a rapid-growing interest in SPR sensors [2]. Particularly, minute variations in the refractive index of the surrounding medium (also known as analyte) change significantly the characteristics of the electromagnetic fields of a surface plasmon mode. As a consequence, the spectral shifts in the mode phase and also losses variations in the associated confined power can be used to detect analyte properties that are described in terms of the refractive index [3].
2021
Authors
Home Ortiz, JM; Macedo, LH; Vargas, R; Romero, R; Mantovani, JRS; Catalao, JPS;
Publication
2021 INTERNATIONAL CONFERENCE ON SMART ENERGY SYSTEMS AND TECHNOLOGIES (SEST)
Abstract
This paper presents a novel mixed-integer second-order cone programming model to increase the photovoltaic (PV) hosting capacity and optimize the operation of distribution systems. The operational problem considers voltage control through the optimal operation of capacitors banks, substations' on-load tap changers, voltage regulators, and network reconfiguration with radial and closed-loop operation. The proposed formulation considers voltage-dependent models for loads and capacitor banks. The objective function maximizes the PV hosting capacity of the system. Numerical experiments are carried out using the 33-node system and results demonstrate the effectiveness of the proposed formulation to increase the penetration of PV sources, especially when the closed-loop operation is allowed, together with network reconfiguration.
2021
Authors
Matos, D; Costa, P; Lima, J; Valente, A;
Publication
OL2A
Abstract
Task Scheduling assumes an integral topic in the efficiency of multiple mobile robots systems and is a key part in most modern manufacturing systems. Advances in the field of combinatorial optimisation have allowed the implementation of algorithms capable of solving the different variants of the vehicle routing problem in relation to different objectives. However few of this approaches are capable of taking into account the nuances associated with the coordinated path planning in multi-AGV systems. This paper presents a new study about the implementation of the Simulated Annealing algorithm to minimise the time and distance cost of executing a tasks set while taking into account possible pathing conflicts that may occur during the execution of the referred tasks. This implementation uses an estimation of the planned paths for the robots, provided by the Time Enhanced A* (TEA*) to determine where possible pathing conflicts occur and uses the Simulated Annealing algorithm to optimise the attribution of tasks to each robot, in order to minimise the pathing conflicts. Results are presented that validate the efficiency of this algorithm and compare it to an approach that does not take into account the estimation of the robots paths.
2021
Authors
Pintado E.; de Oliveira L.C.; Garcia J.E.;
Publication
Proceedings of the 16th International Symposium on Operational Research in Slovenia, SOR 2021
Abstract
An unprecedented outbreak pandemic caused disruption around the world. It had a strong impact on economic sector. Although, the pandemic accelerated the growth of e-commerce for specific categories as food retailer. As a result, several companies restructured their structures, in terms of IT and operations. During the first confinement, the operations and the website of SONAE MC were not prepared for the increase that existed due to the pandemic, COVID-19, causing disruption in the supply chain and long lead times. In this paper, it is explained how SONAE MC reduced its dependence on refrigerated vehicles, simplifying operations and reducing the costs of transporting products from online orders in vehicles with cargo space able to transport positive cold food and negative cold. It is also explained how innovation has ensured that products continue to be transported with quality and safety to all customers of the SONAE MC Darkstore. The result was the implementation of the proposed solution which may grow technologically once information and equipment are available.
2021
Authors
Malbet, F; Boehm, C; Krone Martins, A; Amorim, A; Anglada Escude, G; Brandeker, A; Courbin, F; Ensslin, T; Falcao, A; Freese, K; Holl, B; Labadie, L; Leger, A; Mamon, GA; McArthur, B; Mora, A; Shao, M; Sozzetti, A; Spolyar, D; Villaver, E; Abbas, U; Albertus, C; Alves, J; Barnes, R; Bonomo, AS; Bouy, H; Brown, WR; Cardoso, V; Castellani, M; Chemin, L; Clark, H; Correia, ACM; Crosta, M; Crouzier, A; Damasso, M; Darling, J; Davies, MB; Diaferio, A; Fortin, M; Fridlund, M; Gai, M; Garcia, P; Gnedin, O; Goobar, A; Gordo, P; Goullioud, R; Hall, D; Hambly, N; Harrison, D; Hobbs, D; Holland, A; Hog, E; Jordi, C; Klioner, S; Lancon, A; Laskar, J; Lattanzi, M; Le Poncin Lafitte, C; Luri, X; Michalik, D; de Almeida, AM; Mourao, A; Moustakas, L; Murray, NJ; Muterspaugh, M; Oertel, M; Ostorero, L; Portell, J; Prost, JP; Quirrenbach, A; Schneider, J; Scott, P; Siebert, A; da Silva, A; Silva, M; Thebault, P; Tomsick, J; Traub, W; de Val Borro, M; Valluri, M; Walton, NA; Watkins, LL; White, G; Wyrzykowski, L; Wyse, R; Yamada, Y;
Publication
EXPERIMENTAL ASTRONOMY
Abstract
Sky survey telescopes and powerful targeted telescopes play complementary roles in astronomy. In order to investigate the nature and characteristics of the motions of very faint objects, a flexibly-pointed instrument capable of high astrometric accuracy is an ideal complement to current astrometric surveys and a unique tool for precision astrophysics. Such a space-based mission will push the frontier of precision astrometry from evidence of Earth-mass habitable worlds around the nearest stars, to distant Milky Way objects, and out to the Local Group of galaxies. As we enter the era of the James Webb Space Telescope and the new ground-based, adaptive-optics-enabled giant telescopes, by obtaining these high precision measurements on key objects that Gaia could not reach, a mission that focuses on high precision astrometry science can consolidate our theoretical understanding of the local Universe, enable extrapolation of physical processes to remote redshifts, and derive a much more consistent picture of cosmological evolution and the likely fate of our cosmos. Already several missions have been proposed to address the science case of faint objects in motion using high precision astrometry missions: NEAT proposed for the ESA M3 opportunity, micro-NEAT for the S1 opportunity, and Theia for the M4 and M5 opportunities. Additional new mission configurations adapted with technological innovations could be envisioned to pursue accurate measurements of these extremely small motions. The goal of this White Paper is to address the fundamental science questions that are at stake when we focus on the motions of faint sky objects and to briefly review instrumentation and mission profiles.
2021
Authors
Zhao, P; Gu, C; Cao, Z; Hu, Z; Zhang, X; Chen, X; Hernando-Gil, I; Ding, Y;
Publication
IEEE Transactions on Power Systems
Abstract
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