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Lulea, Sweden

Luleå University of Technology or Luleå tekniska universitet of Sweden is Scandinavia's northernmost university of technology. It has four campuses, located in Luleå , Kiruna , Skellefteå and Piteå . Wikipedia.

Kaplan A.F.H.,Lulea University of Technology
Applied Physics Letters | Year: 2012

The modulation of the angle-dependent Fresnel absorptivity across wavy molten steel surfaces during laser materials processing, like drilling, cutting, or welding, has been calculated. The absorptivity is strongly altered by the grazing angle of incidence of the laser beam on the processing front. Owing to its specific Brewster-peak characteristics, the 10.64 μm wavelength CO 2-laser shows an opposite trend with respect to roughness and angle-of-incidence compared to lasers in the wavelength range of 532-1070 nm. Plateaus or rings of Brewster-peak absorptivity can lead to hot spots on a wavy surface, often in close proximity to cold spots caused by shadow domains. © 2012 American Institute of Physics. Source

Thurley M.J.,Lulea University of Technology
Journal of Process Control | Year: 2011

Fully automated online measurement of the size distribution of limestone particles on conveyor belt is presented based on 3D range data collected every minute during 13 h of production. The research establishes the necessary analysis and measurement capabilities to facilitate automatic control of rock crushing or particle agglomeration processes to improve both energy efficiency and product quality. 3D data from laser triangulation is used to provide high resolution data of the surface of the piled limestone particles. The 3D data is unaffected by color variation in the material and is not susceptible to scale or perspective distortion common in 2D imaging. Techniques are presented covering; sizing of particles, determination of non-overlapped and overlapped particles, and mapping of sizing results to distributions comparable to sieving. Detailed variations in the product sieve-size are shown with abrupt changes when the size range of the limestone particles is changed. © 2010 Elsevier Ltd. All rights reserved. Source

Kastensson A.,Lulea University of Technology
Journal of Cleaner Production | Year: 2014

Given the all-encompassing environmental challenge facing the automotive industry the weight of the car is one essential factor that has an effect on CO2 emissions for both conventional cars and for Electric Vehicles and Hybrid Electric Vehicles. Even though automakers understand and have largely mastered the technical difficulties involved with alternatives to the all-steel body, the mainstream industry has nevertheless for the most part retained it. The purpose of this paper is to explore the SåNätt lightweight project as a concrete example of how two Swedish automakers (Saab and Volvo) have approached the lightweight challenge, but also to conceptualize the project in terms of what hinders and enables environmental innovations in the automotive industry. The result of the study indicates fundamentally different approaches between the automakers. While Saab focused on radical development of new concepts aiming to build a supplier structure for collaboration, Volvo focused on incremental development emphasizing short-term implementation. The empirical data also reveals a tendency for Volvo to be more deeply committed to its infrastructure for body manufacturing (the production of the all-steel body), thus hindering more radical changes. The paper concludes by highlighting a paradox emerging from the case, questioning whether established actors in the automotive industry can effectively deal with the environmental challenge. © 2013 Elsevier Ltd. All rights reserved. Source

Zobel T.,Lulea University of Technology
Journal of Cleaner Production | Year: 2013

Adoption of environmental management systems constitutes one of the most important elements of corporate sustainability in recent years. The purpose of this study is to contribute knowledge as to which firms are most likely to adopt an environmental management system, those which are in greatest need of effective approaches or those which are already environmental frontrunners. A comparison between the improvement in environmental performance over a six-year period prior to ISO 14001 certification and the corresponding improvement in firms choosing not to adopt a system was performed. Environmental data was analyzed by using t-tests for six different areas: air emissions, water emissions, resource use, energy use, waste and overall environmental performance. In none of these environmental areas have we been able to find any statistically significant differences between certified and non-certified firms at 95% confidence level regarding the change in environmental performance prior to ISO 14001-certification or the corresponding period in non-certified firms. Our results indicate that it is equally likely that firms showing less or no improvement choose to implement and certify an environmental management system as it is for firms showing more improvement to do so. © 2012 Elsevier Ltd. All rights reserved. Source

Vyatkin V.,Lulea University of Technology | Vyatkin V.,University of Auckland
IEEE Transactions on Industrial Informatics | Year: 2013

This paper presents one perspective on recent developments related to software engineering in the industrial automation sector that spans from manufacturing factory automation to process control systems and energy automation systems. The survey's methodology is based on the classic SWEBOK reference document that comprehensively defines the taxonomy of software engineering domain. This is mixed with classic automation artefacts, such as the set of the most influential international standards and dominating industrial practices. The survey focuses mainly on research publications which are believed to be representative of advanced industrial practices as well. © 2005-2012 IEEE. Source

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