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Otakaari 1 grandhall. Photo: Esa Kapila

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Now showing 1 - 13 of 13

Recent Submissions

Consumer co-operation around the world : ‘Strategic renewal’ since 1980
(Society for Co-operative Studies, 2023-10-18) Wilson, John F.; Skurnik, Samuli; Ekberg, Espen; Webster, Anthony; Department of Management Studies; Northumbria University; BI Norwegian Business School
Surface Bubbles Emergence as an Indicator for Optimal Concrete Compaction
(MDPI AG, 2024-05) Ahmed, Hassan; Punkki, Jouni; Department of Civil Engineering; Mineral Based Materials and Mechanics; Department of Civil Engineering
Compaction quality significantly influences the strength and durability of concrete in structures. Under-compacting can retain entrapped air, reducing strength, while over-compacting can lead to segregation, creating local variances in strength distribution and modulus of elasticity in the concrete structure. This study examines the widely adopted concept that compaction is optimal when bubbles cease to emerge on the concrete surface. We recorded the surface activity of six comparable concrete specimens during the compaction process using a 4K video camera. Four specimens were compacted using a table vibrator and two with a poker vibrator. From the video frames, we isolated the bubbles for analysis, employing digital image processing techniques to distinguish newly risen bubbles per frame. It was found that the bubbles continuously rose to the surface in all specimens throughout the compaction process, suggesting a need for extended compaction, with some specimens showing a slow in the rate of the bubbles’ emergence. However, upon examining the segregation levels, it was discovered that all the specimens were segregated, some severely, despite the continued bubble emergence. These findings undermine the reliability of using bubble emergence as a principle to stop compaction and support the need for developing online measurement tools for evaluating compaction quality.
Nonlinear optical response of strain-mediated gallium arsenide microwire in the near-infrared region
(De Gruyter, 2024-05-03) Cui, Xiangpeng; Huo, Wenjun; Qiu, Linlu; Zhao, Likang; Wang, Junjie; Lou, Fei; Zhang, Shuaiyi; Khayrudinov, Vladislav; Tam, Wing Yim; Lipsanen, Harri; Yang, He; Wang, Xia; Department of Electronics and Nanoengineering; Harri Lipsanen Group
A CFD study on the hydrodynamic response of a small-scale ice floe induced by a passing ship
(Elsevier Science Inc., 2024-05-31) Jiang, Zongyu; Hirdaris, Spyros; Tavakoli, Sasan; Suominen, Mikko; Kujala, Pentti; Department of Mechanical Engineering; Marine and Arctic Technology
A Reynolds averaged Navier-Stokes (RANS) computational fluid dynamics (CFD) model is built to investigate the hydrodynamic response of a circular ice floe under the influence of a passing ship in calm waters. The ship, mirroring the KRISO Container Shipʼs hull design, progresses near an ice floe whose diameter is 30% of the shipʼs length and its thickness is 3 m. The ship advances at a constant speed, which is handled by using the overset mesh technique. This study focuses on the ice floe's motions and the hydrodynamic forces induced by three speeds and three transverse distances of the passing ship. Findings reveal that ship-generated wakes notably influence the ice floeʼs motions, with a greater influence on sway than surge. Additionally, the ship's speed and proximity distinctly affect the ice floe's motions.
Evaluating performance in the context of mobile telework : an attention-based view
(Routledge, 2024-05-20) Myllymäki, Dina; Smale, Adam; Sumelius, Jennie; Department of Management Studies; University of Vaasa; Hanken School of Economics
This study is an empirical account of how line managers evaluate the performance of their subordinates in the context of mobile telework. Whilst the increasing use of new technologies affords certain advantages for line managers in remote performance evaluation (PE), it also results in a greater volume, fragmentation and variety of performance data, which can be challenging to manage. Adopting an attention-based view (ABV), we shed light on the role of technology in PE, elaborating on the kinds of attentional stimuli that are generated by technology as part of the broader socio-technical work environment, and how these together with the attentional perspectives of the manager influence attentional engagement, i.e. what managers direct their time, energy and effort on in PE. Our focus is on attention as something line managers do, in their immediate context. We contribute to the remote work and PE literature by showing how the interplay between two drivers of attentional engagement: attentional stimuli (different possible foci of attention in the external environment) and managers’ own attentional perspectives (the cognitive and motivational structures that influence what stimuli receive attention) influence the attentional engagement in PE of mobile teleworkers.