Luleå University of Technology

GHG reduction potential of biomass gasification pathways: An Austrian life cycle emission analysis

Dual fluidized-bed gasification of biomass is one way to defossilize the Austrian energy system. Although this technology is yet to be implemented on an industrial scale, it shows potential in terms of e.g. feedstock flexibility and product range. The present study assesses the s...

Numerical study on geometric constraint effects on ductile fracture toughness of thin advanced high-strength steel sheet

Abstract The total fracture energy arises from the energy dissipated within the fracture process zone, comprising the work of necking and the work of fracture, and the energy dissipated in the surrounding plastic zone, referred to as plastic work. The essential work of fracture m...

When industrial companies implement circular business models, what do they really do?

Purpose Implementing circular business models (CBMs) in industry is promising yet difficult. Prior research has largely focused on identifying barriers to CBM adoption and the enablers needed to overcome them. However, addressing barriers alone is insufficient, as circularity mus...

Swedish school organizers navigating conflicting expectations. To whom do they perceive themselves accountable?

This article contributes to research on educational governance by showing how accountability relations shape the interpretation and enactment of national policy at the meso level. By approaching accountability as a social relation rather than a policy instrument, it highlights ho...

Space circular economy: planned experimental approaches for spacecraft solar arrays

Abstract The space industry aims to promote economic growth while ensuring a sustainable use of space. The sustainability objectives of space often refer to the cleaning of space debris via Active Debris Removal missions. Those solutions, despite being needed, are unsustainable a...

Flow of power-law fluids in thin straight tubes of non-uniform cross-section

Abstract We analyze the asymptotic behavior of solutions to a boundary value problem describing the flow of a non-Newtonian so-called power-law fluid in a thin tube with a variable cross-section depending on a small parameter $$\varepsilon$$ , representing the ratio between the c...

Time-Varying Electromagnetic Systems - Challenges and Methodologies

Time-varying (TV) electromagnetic (EM) systems and devices introduce a fundamentally new framework in EM theory by extending classical concepts beyond traditional time-invariant formulations. In conventional EM systems, temporal invariance combined with the steady-state assumptio...

Effect of Drying at 120 °C and 150 °C on Selected Mechanical Properties of Silver Fir (Abies alba Mill.)

High-temperature drying can considerably improve drying efficiency. However, information on its impact on the mechanical properties of silver fir during industrial high-temperature drying remains limited. Elevated drying temperatures may induce changes in wood structure that can...

Interpretable modeling for material transportation process in an industrial cement vertical roller mill

Abstract Vertical roller mills (VRMs) dominate cement finish grinding because of their high efficiency and dry operation. However, the interaction among ventilation, fan operation, and pneumatic material transport remains poorly quantified using plant data. In this study, the pre...

Fire behaviour of thermo-mechanically densified wood

Abstract This study investigates the effect of thermo-mechanical densification on the fire behaviour of wood using cone calorimetry. Scots pine wood was thermo-mechanically densified from an initial thickness of 20 mm to target thicknesses of 14 and 10 mm and compared with non-de...

Surface microbial dynamics and residual diversity in patient rooms with wooden and painted walls

Wood is a biobased material that supports long-term carbon storage; however, its suitability for use in healthcare facility interiors remains insufficiently studied. This study assessed surface microbial dynamics and residual diversity in patient rooms with conventional painted w...