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- Archetti, Joao Antonio Guedes, et al.
(författare)
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Real time validation of a control system for microgrids with distributed generation and storage resources
- 2023
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Ingår i: Electric power systems research. - : Elsevier. - 0378-7796 .- 1873-2046. ; 223
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Tidskriftsartikel (refereegranskat)abstract
- Faced with a scenario in which the increase in renewable energy generated near consumer centers can cause problems for the operation of the electrical network, the present work proposes a real-time simulation model for automation and control systems of electrical distribution networks with microgrids, distributed generation, and storage resources. The proposed model consists of a hardware-in-the-loop control with the aid of a simulation tool in conjunction with a Real-Time Digital Simulator (RTDS) and considers the dynamic behavior of switched elements and inverters. A communication platform using TCP/IP protocol between RTDS (power system) and MatLab/Simulink (optimization algorithms) allows the operation of the network in grid-connected and islanded mode, guaranteeing the computational time for experimental implementation. For the first mode, an algorithm is proposed to solve an optimal dispatch energy storage system problem. Second mode, an algorithm is proposed to solve a load shedding problem. The objective is to operate the microgrids optimally and evaluate the performance of a storage system based on real data from the state of Parana, in Brazil. Results show that the optimization algorithms are experimentally applicable, obtaining reasonable computational time to find optimal solutions and an assertive decision-making to meet the objectives. Thus, the proposed framework is a potential tool to validate algorithms for active management of microgrids in real-time simulation.
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- Donahue, N. M., et al.
(författare)
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Aging of biogenic secondary organic aerosol via gas-phase OH radical reactions
- 2012
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Ingår i: Proceedings of the National Academy of Sciences of the United States of America. - : Proceedings of the National Academy of Sciences. - 0027-8424 .- 1091-6490. ; 109:34, s. 13503-13508
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Tidskriftsartikel (refereegranskat)abstract
- The Multiple Chamber Aerosol Chemical Aging Study (MUCHACHAS) tested the hypothesis that hydroxyl radical (OH) aging significantly increases the concentration of first-generation biogenic secondary organic aerosol (SOA). OH is the dominant atmospheric oxidant, and MUCHACHAS employed environmental chambers of very different designs, using multiple OH sources to explore a range of chemical conditions and potential sources of systematic error. We isolated the effect of OH aging, confirming our hypothesis while observing corresponding changes in SOA properties. The mass increases are consistent with an existing gap between global SOA sources and those predicted in models, and can be described by a mechanism suitable for implementation in those models.
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- Maurin, Hanna, et al.
(författare)
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Exploring gender differences in perceptions of 3D telepresence collaboration technology : An example from emergency medical care.
- 2006
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Ingår i: Proceedings of 4th Nordic Conference on Human-Computer Interaction. - : ACM Press. ; , s. 381-
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Konferensbidrag (refereegranskat)abstract
- Previous research on gender differences and collaboration technology illustrate the need to investigate gender issues as early as possible in the development cycle in order to avoid any negative consequences the technology may impose. Therefore we are investigating the potential of 3D telepresence technology now when only a proof-of-concept demonstration of the technology exists. We conducted a controlled lab study using a post-test design in which male and female paramedics diagnosed and treated a trauma victim (a computerized mannequin) in collaboration with a physician via 2D video or a 3D proxy. The results show several gender differences that imply male paramedics may inherently receive more benefits from use of the 3D telepresence technology than female paramedics.
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- Maurin Söderholm, Hanna, et al.
(författare)
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Exploring the potential of video technologies for collaboration in emergency medical care : Part II. Task performance
- 2008
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Ingår i: Journal of The American Society For Information Science And Technology. - : John Wiley & Sons, Inc.. - 1532-2882 .- 1532-2890. ; 59:14, s. 2335-2349
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Tidskriftsartikel (refereegranskat)abstract
- We conducted an experiment with a posttest, between-subjects design to evaluate the potential of emerging 3D telepresence technology to support collaboration in emergency health care. 3D telepresence technology has the potential to provide richer visual information than do current 2D video conferencing techniques. This may be of benefit in diagnosing and treating patients in emergency situations where specialized medical expertise is not locally available. The experimental design and results concerning information behavior are presented in the article “Exploring the Potential of Video Technologies for Collaboration in Emergency Medical Care: Part I. Information Sharing” (Sonnenwald et al., this issue). In this article, we explore paramedics' task performance during the experiment as they diagnosed and treated a trauma victim while working alone or in collaboration with a physician via 2D videoconferencing or via a 3D proxy. Analysis of paramedics' task performance shows that paramedics working with a physician via a 3D proxy performed the fewest harmful interventions and showed the least variation in task performance time. Paramedics in the 3D proxy condition also reported the highest levels of self-efficacy. Interview data confirm these statistical results. Overall, the results indicate that 3D telepresence technology has the potential to improve paramedics' performance of complex medical tasks and improve emergency trauma health care if designed and implemented appropriately.
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- Prasciolu, Mauro, et al.
(författare)
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On the use of multilayer Laue lenses with X-ray free electron lasers
- 2021
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Ingår i: International Conference on X-Ray Lasers 2020. - : SPIE. - 0277-786X .- 1996-756X. - 9781510646186 ; 11886
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Konferensbidrag (refereegranskat)abstract
- We report on the use of multilayer Laue lenses to focus the intense X-ray Free Electron Laser (XFEL) beam at the European XFEL to a spot size of a few tens of nanometers. We present the procedure to align and characterize these lenses and discuss challenges working with the pulse trains from this unique X-ray source.
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