DSpace Collection:http://hdl.handle.net/10174/11172026-03-25T10:42:21Z2026-03-25T10:42:21ZModelling the heat transitionAhsan, Muhammadvan der Bijl, LeanderBodas, ShreehariBuccoliero, FabioChen, YanfeiCorreia, Joaquim M.C.Gebretekle, Tsega KahsayHashemi, Leilavan der Hijden, JorisLeonardi, FrancescaLord, GabrielMartinez, Juan E. MachadoTang, ZhiruiWinschermann, LeoniYu, Jialinghttp://hdl.handle.net/10174/399862025-12-18T17:57:48Z2023-01-01T00:00:00ZTitle: Modelling the heat transition
Authors: Ahsan, Muhammad; van der Bijl, Leander; Bodas, Shreehari; Buccoliero, Fabio; Chen, Yanfei; Correia, Joaquim M.C.; Gebretekle, Tsega Kahsay; Hashemi, Leila; van der Hijden, Joris; Leonardi, Francesca; Lord, Gabriel; Martinez, Juan E. Machado; Tang, Zhirui; Winschermann, Leoni; Yu, Jialing
Editors: Koellermeier, Julian; Tibboel, Pieter; Trenn, Stephan
Abstract: The Dutch government is committed to reducing its dependence on fuel imports
and promoting sustainable practices, which has led to plans to move away from
gas-powered heating systems towards alternative heat sources such as district heating
or electric heat pumps. In this heat transition, DHM provides advice and leadership
for investment decisions, particularly at the municipal level. Key considerations include
the transition costs, choice of heat commodity, and necessary infrastructure.
This project explores three decision-making models that aim to minimize social costs
in an objective manner: Monte Carlo simulations, energy hubs, and mathematical
programs. The results of this study can be used as a starting point for further research
to support a sustainable and cost-effective heat transition.2023-01-01T00:00:00ZMobile E-Bike Sharing Systems with Integrated Photovoltaics: Electric Mobility Solutions for Large Events in Évora, PortugalOliveira, HelenaCarmo, PauloSilva, JoséFialho, LuísInfante, PauloHorta, Pedrohttp://hdl.handle.net/10174/398012025-12-10T10:56:16Z2025-11-01T00:00:00ZTitle: Mobile E-Bike Sharing Systems with Integrated Photovoltaics: Electric Mobility Solutions for Large Events in Évora, Portugal
Authors: Oliveira, Helena; Carmo, Paulo; Silva, José; Fialho, Luís; Infante, Paulo; Horta, Pedro
Abstract: Mobile e-bike sharing stations integrated with photovoltaics are proposed for Évora to serve baseline urban demand and event-related surges while respecting heritage constraints. The system is powered primarily by photovoltaics, with optional grid-assist for resilience. We present a siting–sizing framework that (i) selects candidate locations via AHP and a p-median model based on origin–destination flows and travel times, and (ii) sizes PV and storage under two energy hypotheses: full-recharge of all e-bikes versus a usage-driven demand model (Wh/km × trip length × trips/bike). Using worst-month irradiance and aggregate conversion losses, a worked example shows that the full-recharge assumption yields higher capacities (≈6 kWp PV + 25 kWh storage per 10 bikes for event peaks), whereas the usage-driven model reduces sizing substantially while meeting service levels; both are reported to ensure robustness. This compact framework is directly applicable to heritage cities planning PV-micromobility for large events.2025-11-01T00:00:00ZLaughter in task-based settings: whom we talk to affects how, when, and how often we laughBranco, C.Trancoso, I.Infante, P.Truong, K. P.http://hdl.handle.net/10174/397862025-12-10T10:51:38Z2023-01-01T00:00:00ZTitle: Laughter in task-based settings: whom we talk to affects how, when, and how often we laugh
Authors: Branco, C.; Trancoso, I.; Infante, P.; Truong, K. P.
Abstract: Map task corpora are not typically used to study laughter, but they allow an interesting analysis of multiple factors such as familiarity between the participants, their gender, and eye contact. We conducted linear/generalized mixed-effects analysis to study if co-laughter, laughter rate, and the percentage of voiced frames in laughs are influenced by such factors. Our results show that, in conversations without eye contact, the gender of the participant was statistically relevant regarding laughter rate and the percentage of voiced frames, and the difference in gender was relevant regarding co-laughter. On the other hand, with eye contact, familiarity was statistically relevant with respect to co-laughter, laughter rate, and the percentage of voiced frames. Most of our results align and extend what has been previously found, except for voiced laughs between friends. This study emphasizes the highly variable character of laughter and its dependence on interlocutors' characteristics.2023-01-01T00:00:00ZStabilization of Oldroyd-B Fluid Flow Simulations Based On Eigenvalues of Conformation TensorPires, MariliaBodnár, Tomáshttp://hdl.handle.net/10174/364622024-03-19T16:57:51Z2023-03-01T00:00:00ZTitle: Stabilization of Oldroyd-B Fluid Flow Simulations Based On Eigenvalues of Conformation Tensor
Authors: Pires, Marilia; Bodnár, Tomás
Editors: Maria Amélia Loja, Mourad Bezzeghoud; Joaquim Infante Barbosa, José Alberto Rodrigues
Abstract: From a physical point of view, the molecular strain tensor can be represented
at continuous level in viscoelastic fluids by the conformation tensor. This symmetric tensor
should always be positive definite, however the positive-definiteness is sometimes lost
in numerical simulations of non-Newtonian viscoelastic fluids flows at larger values of
the Weissenberg number. This problem known as the High Weissenberg Number Problem
(HWNP) and is characterized by the breakdown of numerical solutions. In some cases
the HWNP can be avoided (or at least delayed) by adding a stress diffusion term to the
transport equations for viscoelastic tensors. In this work, numerical tests are presented,
demonstrating the HWNP problem and its possible cure based on stabilization method employing
local addition of an artificial stress diffusion term to the transport equations, in the
regions of the computational domain where the positive-definiteness of the conformation
tensor can be violated.2023-03-01T00:00:00Z