| 1. |
- Elgarf, Maha, et al.
(författare)
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"And then what happens?" Promoting Children's Verbal Creativity Using a Robot
- 2022
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Ingår i: Proceedings of the 2022 ACM/IEEE International Conference on Human-Robot Interaction (HRI '22). - : IEEE. - 9781665407311 - 9781665407328 ; , s. 71-79
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Konferensbidrag (refereegranskat)abstract
- While creativity has been previously studied in Child-Robot interaction, the effect of regulatory focus on creativity skills has not been investigated. This paper presents an exploratory study that, for the first time, uses the Regulatory Focus Theory to assess children's creativity skills in an educational context with a social robot. We investigated whether two key emotional regulation techniques, promotion (approach) and prevention (avoidance), stimulate creativity during a storytelling activity between a child and a robot. We conducted a between-subjects field study with 69 children between the ages of 7 and 9 years old, divided between two study conditions: (1) promotion, where a social robot primes children for action by eliciting positive emotional states, and (2) prevention, where a social robot primes children for avoidance by evoking a states related to security and safety associated with blockage-oriented behaviors. To assess changes in creativity as a response to the priming interaction, children were asked to tell stories to the robot before (pre-test) and after (post-test) the priming interaction. We measured creativity levels by analyzing the verbal content of the stories. We coded verbal expressions related to creativity variables, including fluency, flexibility, elaboration, and originality. Our results show that children in the promotion condition generated significantly more ideas, and their ideas were on average more original in the stories they created in the post-test rather than in the pre-test. We also modeled the process of creativity that emerges during storytelling in response to the robot's verbal behavior. This paper enriches the scientific understanding of creativity emergence in child-robot collaborative interactions.
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| 2. |
- Kehoe, Laura, et al.
(författare)
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Make EU trade with Brazil sustainable
- 2019
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Ingår i: Science. - : American Association for the Advancement of Science (AAAS). - 0036-8075 .- 1095-9203. ; 364:6438, s. 341-
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)
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| 3. |
- Monzó, Patricia, et al.
(författare)
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A novel numerical approach for imposing a temperature boundary condition at the borehole wall in borehole fields
- 2015
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Ingår i: Geothermics. - : Elsevier BV. - 0375-6505 .- 1879-3576. ; 56, s. 35-44
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Tidskriftsartikel (refereegranskat)abstract
- The design of a borehole field should be based on a long-term simulation of its thermal response for the intended energy loads. A well-known method to evaluate the response is based on a pre-calculated dimensionless function, the g-function. When calculating g-functions, there are two commonly used approaches for treating the boundary condition at the borehole wall: a constant heat flux at every instant of time, or a uniform temperature at a constant total heat flow to the borehole field. This paper is focused on a new approach to model the thermal process of borehole fields; in particular with a precise representation of a uniform temperature boundary condition at the borehole wall. The main purpose of this model is to be used as a research tool to either generate g-functions for particular cases or handle situations that cannot be addressed by others methods. First, the almost constant temperature along the borehole heat exchanger in operation requires a boundary condition of essentially isothermal boreholes along the depth. In a common case, the borehole heat exchangers are connected in parallel, thus all boreholes should have the same temperature. Also, the total heat flow to the borehole field should be constant over time. For this purpose, a numerical model in which the boreholes are filled with a hypothetical highly conductive material has been built, reproducing the isothermal condition. By thermally interconnecting the boreholes, the equal temperature condition is satisfied. Finally, the specified total heat flow is fed into one spot at the highly conductive material. The model is validated by generating g-functions of some simple borehole field configurations. The g-functions present, in general, a good agreement with the existing solutions for a similar boundary condition. Moreover, the model is also tested against real experimental data from a 2. ×. 3 borehole field at an office building. The simulated daily fluid temperatures are compared with measured daily fluid temperatures for the sixth year of operation. The simulated values present, in general, a good agreement with the measured data. The results show that there are no significant differences with regard to the boundary conditions at the borehole wall, which for this specific case is due to the fact that the system is thermally balanced.
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| 4. |
- Monzó, Patricia, et al.
(författare)
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Experimental Validation of a Numerical Model for the Thermal Response of a Borehole Field
- 2014
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Ingår i: ASHRAE TRANSACTIONS 2014, VOL 120, PT 2. - : ASHRAE.
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Konferensbidrag (refereegranskat)abstract
- The design of borehole fields for ground coupled-heat pump systems is often based on so-called g-functions, a pre-calculated dimensionless temperature response to a step heat load. The g-function is specific to the borehole field geometry. For a long-term analysis of a particular borehole field, the average borehole wall temperature is obtained from the g-function and a temporal superposition of its thermal load steps. There are two accepted provisions for the g-function regarding the boundary condition used at (and along) the borehole wall: a constant heat flux at every instant of time, or a uniform temperature at constant total heat flow to the borehole field, respectively. In this paper, a numerical model is built up according to the geometrical characteristics and ground thermal properties of a 2x3 borehole demo site at the Universitat Politecnica de Valencia, Spain. The model is separately studied with regard to the two boundary conditions. The models are first compared in terms of their g-function, which are verified against reference solutions. Then, the daily fluid temperatures are obtained from each of these models with measured daily loads during a six year period. The results are compared with measured daily fluid temperatures for the sixth year of operation. The simulated values present, in general, a good agreement with the measured data. The results show that there are no significant differences with regard to the boundary conditions at the borehole wall, which for this specific case is due to the fact that the system is thermally balanced. The simulated temperatures are more accurate during cooling periods.
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| 5. |
- Ruiz-Calvo, Félix, et al.
(författare)
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Coupling short-term (B2G model) and long-term (g-function) models for ground source heat exchanger simulation in TRNSYS. Application in a real installation
- 2016
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Ingår i: Applied Thermal Engineering. - : Elsevier. - 1359-4311 .- 1873-5606. ; 105, s. 720-732
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Tidskriftsartikel (refereegranskat)abstract
- Ground-source heat pump (GSHP) systems represent one of the most promising techniques for heating and cooling in buildings. These systems use the ground as a heat source/sink, allowing a better efficiency thanks to the low variations of the ground temperature along the seasons. The ground-source heat exchanger (GSHE) then becomes a key component for optimizing the overall performance of the system. Moreover, the short-term response related to the dynamic behaviour of the GSHE is a crucial aspect, especially from a regulation criteria perspective in on/off controlled GSHP systems. In this context, a novel numerical GSHE model has been developed at the Instituto de Ingeniería Energética, Universitat Politècnica de València. Based on the decoupling of the short-term and the long-term response of the GSHE, the novel model allows the use of faster and more precise models on both sides. In particular, the short-term model considered is the B2G model, developed and validated in previous research works conducted at the Instituto de Ingeniería Energética. For the long-term, the g-function model was selected, since it is a previously validated and widely used model, and presents some interesting features that are useful for its combination with the B2G model. The aim of the present paper is to describe the procedure of combining these two models in order to obtain a unique complete GSHE model for both short- and long-term simulation. The resulting model is then validated against experimental data from a real GSHP installation.
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