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Otakaari 1 grandhall. Photo: Esa Kapila
 

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Recent Submissions

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Behavior of marine thruster lip seals under typical operating conditions
(Elsevier Inc., 2025-01) Morad, Omar; Viitala, Raine; Saikko, Vesa; Department of Mechanical Engineering; Mechatronics
Marine thruster lip seals pose a condition monitoring challenge, yet they are seldom studied tribologically. The present work studies the behavior of a 300 mm diameter NBR marine thruster lip seal (n = 3) under typical operating conditions. Frictional torque and subsurface temperature were measured under 27 combinations of oil temperature, oil pressure, and rotational speed. The frictional torque increased with increasing oil pressure and decreased with increasing oil temperature. The subsurface temperature increased with increasing oil temperature, oil pressure, and rotational speed. There was no clear relation between the frictional torque and subsurface temperature. The frictional torque ranged 9.6–14.4 Nm, and subsurface temperature 57–94 °C. Preliminary wear measurements showed a wear track width of 0.2–0.3 mm and a wear rate of 0.031 ± 0.001 mm3/hour.
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Induced electric fields in MRI settings and electric vestibular stimulations: same vestibular effects?
(Springer, 2024-09-11) Bouisset, Nicolas; Laakso, Ilkka; Department of Electrical Engineering and Automation; Electromagnetics in Health Technology; Western University
In Magnetic Resonance Imaging scanner environments, the continuous Lorentz Force is a potent vestibular stimulation. It is nowadays so well known that it is now identified as Magnetic vestibular stimulation (MVS). Alongside MVS, some authors argue that through induced electric fields, electromagnetic induction could also trigger the vestibular system. Indeed, for decades, vestibular-specific electric stimulations (EVS) have been known to precisely impact all vestibular pathways. Here, we go through the literature, looking at potential time varying magnetic field induced vestibular outcomes in MRI settings and comparing them with EVS-known outcomes. To date, although theoretically induction could trigger vestibular responses the behavioral evidence remains poor. Finally, more vestibular-specific work is needed.
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How backstory and direct address reformulate the Shakespearean character on television: The case of the missing psychological motivation for House of Cards’ Frank Underwood
(Intellect, 2024) Robles García, Brenda J.; Department of Film
This article delves into narrative elements of direct address and backstory in television, focusing on House of Cards (2012–19), Shakespeare’s Richard III and Game of Thrones (2011–19). Comparing dramaturgical approaches in stage plays and TV series, the study highlights House of Cards’ unique incorporation of a pragmatic use of the direct address to create ‘world-view’ for character exploration. The analysis extends to Game of Thrones, emphasizing Tyrion Lannister’s self-descriptive addresses revealing a psychological struggle rooted in rejection and backstory. The article proposes a methodological framework linking first lines or direct addresses to character backstories, emphasizing the role of self-descriptive asides in character creation. It introduces the concept of a ‘psychological motivational arc’ within character arcs, exploring how direct addresses contribute to nonlinear character development. Concluding with an in-depth examination of House of Cards’ Frank Underwood, it scrutinizes Willimon’s ‘show, don’t tell’ approach, questioning its potential limitations on character depth and challenging traditional screenwriting advice. The analysis unravels the interplay between direct address, backstory, and character development in television series, offering insights into evolving narrative techniques and their implications for contemporary screenwriting.
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The potential of local exhaust combined with mixing and displacement ventilation systems to mitigate COVID-19 transmission risks
(Elsevier BV, 2024-12-01) Zhao, Weixin; Ejaz, Muhammad Farhan; Kilpeläinen, Simo; Jokisalo, Juha; Kosonen, Risto; Department of Mechanical Engineering; Energy Conversion and Systems
The performance of two types of air diffusers, a perforated duct and a low-velocity unit coupled with local exhausts, on airborne transmission and cross-infection was investigated in a meeting room. The effect of air diffusers’ locations on airborne transmission was investigated. Six local exhausts were installed above six workstations at 2.0 m height. Respiratory-generated airborne pathogens were simulated using SF6 in the exhaled air of the manikin acting as an infected person. The SF6 concentration in the inhaled air of five susceptible persons remained steady with perforated duct located on the ceiling and at 1.7 m height attached to the corridor wall, but fluctuated greatly when perforated duct were located on the floor, although with a much lower concentration level. The perforated duct under the warm window showed the best potential for mitigating airborne transmission. The concentration in the inhaled air was varied with horizontally supplied low-velocity unit, but much steadier with low-velocity unit at 1.7 m attached to the wall. With an adjusted airflow pattern from low-velocity unit, the inhaled concentration was much lower and uniform among the five susceptible persons. The contaminant removal effectiveness (CRE) was 4.3 with perforated duct under a warm window on the floor. With an adjusted airflow pattern from low-velocity unit, the CRE was much more consistent and increased from 2.1 to 3.9 with an airflow rate from 61 l/s to 116 l/s. The infection probability was the lowest with the perforated duct on the floor and adjusted low-velocity unit.
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Exploring the barriers and enablers of industrial solutions in renovation projects: A mixed-methods study in the Finnish AEC industry
(Frontiers Media, 2024) Chauhan, Krishna; Peltokorpi, Antti; Lavikka, Rita; Seppänen, Olli; Department of Civil Engineering; Performance in Building Design and Construction
Offsite construction is a major approach to promote industrialisation in construction. However, implementation of prevailing industrial solutions is often less adequate and unsatisfactory, especially in renovation projects. Thus, the overall objective of this study is to understand the reasons behind the poor performance in implementation of the industrial solutions. The specific objectives include identifying the prominent barriers and enablers of prefabricated products in renovation projects. This study employed exploratory sequential mixed method. The qualitative data were gathered via semi-structured interviews to collect experiences and perception of experts related to industrial solutions. This was followed by quantitative data collection via questionnaire survey using a seven-point Likert scale. The major barriers and enablers of industrial solutions in renovation projects have been ranked in this study. The findings reveal that immutability of heritage buildings, the tolerances of old buildings and insufficient spaces to ensure construction work ranked the top three barriers for implementing industrial solutions in renovation projects. Moreover, the study identifies the most significant enablers including shorter project schedules, quality improvement and work safety improvement. The novelty of the research lies in the comprehensive presentation of the barriers and enablers of industrial solutions in the renovation project context. Policymakers, designers, and contractors can utilize these findings as guiding principles to enhance decision-making processes and create viable solutions for the obstacles encountered in renovation projects. This study further represents a vital step towards the efficient and effective implementation of industrial solutions in renovation projects, resulting in more sustainable and cost-effective outcomes.