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  • 1.
    Ainegren, Mats
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Management and Mechanical Engineering.
    Tuplin, Simon
    Loughborough University, Loughborough, UK.
    Carlsson, Peter
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Management and Mechanical Engineering.
    Render, Peter
    Loughborough University, Loughborough, UK.
    Design and development of a climatic wind tunnel for physiological sports experimentation2019In: Proceedings of the Institution of Mechanical Engineers, Part P: Journal of Sports Engineering and Technology, ISSN 1754-3371, Vol. 233, no 1, p. 86-100Article in journal (Refereed)
    Abstract [en]

    The aim of this project was to develop a wind tunnel that enables the study of human performance during various types ofsports and physical activities by examining the influence of aerodynamic drag, precipitation, frictional forces and gravitationalforces on uphill and downhill travel on a moving substrate. An overall design for a wind tunnel and working section containinga large treadmill was drafted, followed by computational fluid dynamics simulations of flow conditions to assess thedesign’s feasibility and select from different geometries prior to its construction. The flow conditions in the completed windtunnel were validated using different flows, speeds and treadmill inclinations. Pilot experiments were carried out using across-country skier to investigate the effect of aerodynamic drag on oxygen uptake during double poling and the maximalachieved speed when rolling on a declined treadmill. The purpose was to validate the usefulness of the tunnel. The resultsshowed that flow conditions are acceptable for experiments even in worst-case scenarios with maximal inclined and declinedtreadmill. Results also showed that aerodynamic drag has a significant impact on the skier’s energy expenditure.

  • 2.
    Chudinova, E.
    et al.
    National Research Tomsk Polytechnic University, Tomsk, Russian Federation.
    Surmeneva, M.
    National Research Tomsk Polytechnic University, Tomsk, Russian Federation.
    Koptioug, Andrei
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Management and Mechanical Engineering.
    Loza, K.
    University of Duisburg-Essen, Essen, Germany.
    Prymak, O.
    University of Duisburg-Essen, Essen, Germany.
    Epple, M.
    University of Duisburg-Essen, Essen, Germany.
    Surmenev, R.
    National Research Tomsk Polytechnic University, Tomsk, Russian Federation.
    Surface modification of Ti6Al4V alloy scaffolds manufactured by electron beam melting2019In: / [ed] Godymchuk A.,Rieznichenko L.,Semenov M., Institute of Physics Publishing (IOPP), 2019, no 1Conference paper (Refereed)
    Abstract [en]

    In this paper, the results of the surface functionalization of the Ti6Al4V alloy scaffolds with different structures for use as a material for medical implants are presented. Radio frequency magnetron sputtering was used to modify the surface of the porous structures by deposition of the biocompatible hydroxyapatite (HA) coating with the thickness of 86050 nm. The surface morphology, elemental and phase composition of the HA-coated scaffolds were studied. According to energy-dispersive X-ray spectroscopy, the stoichiometric ratio of Ca/P for flat, orthorhombic and cubic scaffolds is 1.65, 1.60, 1.53, respectively, which is close to that of stoichiometric ratio for HA (Ca/P = 1.67). It was revealed that this method of deposition makes it possible to obtain the homogeneous crystalline coating both on the dense sample and in the case of scaffolds of complex geometry with different lattice cell structure. 

  • 3.
    Chudinova, Ekaterina A.
    et al.
    National Research Tomsk Polytechnic University, Tomsk, Russian Federation.
    Surmeneva, Maria A.
    National Research Tomsk Polytechnic University, Tomsk, Russian Federation.
    Timin, Alexander S.
    National Research Tomsk Polytechnic University, Tomsk, Russian Federation; First I. P. Pavlov State Medical University of St. Petersburg, St. Petersburg, Russian Federation.
    Karpov, Timofey E.
    Peter The Great St. Petersburg Polytechnic University, St. Petersburg, Russian Federation.
    Wittmar, Alexandra
    University of Duisburg-Essen, Essen, Germany.
    Ulbricht, Mathias
    University of Duisburg-Essen, Essen, Germany.
    Ivanova, Anna
    National Research Tomsk Polytechnic University, Tomsk, Russian Federation.
    Loza, Kateryna
    University of Duisburg-Essen, Essen, Germany.
    Prymak, Oleg
    University of Duisburg-Essen, Essen, Germany.
    Koptioug, Andrei
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Management and Mechanical Engineering.
    Epple, Matthias
    University of Duisburg-Essen, Essen, Germany.
    Surmenev, Roman A.
    National Research Tomsk Polytechnic University, Tomsk, Russian Federation.
    Adhesion, proliferation, and osteogenic differentiation of human mesenchymal stem cells on additively manufactured Ti6Al4V alloy scaffolds modified with calcium phosphate nanoparticles2019In: Colloids and Surfaces B: Biointerfaces, ISSN 0927-7765, E-ISSN 1873-4367, Vol. 176, p. 130-139Article in journal (Refereed)
    Abstract [en]

    In the present study, biocomposites based on 3D porous additively manufactured Ti6Al4V (Ti64) scaffolds modified with biocompatible calcium phosphate nanoparticles (CaPNPs) were investigated. Ti64 scaffolds were manufactured via electron beam melting technology using an Arcam machine. Electrophoretic deposition was used to modify the scaffolds with CaPNPs, which were synthesized by precipitation in the presence of polyethyleneimine (PEI). Dynamic light scattering revealed that the CaP/PEI nanoparticles had an average size of 46 ± 18 nm and a zeta potential of +22 ± 9 mV. Scanning electron microscopy (SEM) revealed that the obtained spherical CaPNPs had an average diameter of approximately 90 nm. The titanium-based scaffolds coated with CaPNPs exhibited improved hydrophilic surface properties, with a water contact angle below 5°. Cultivation of human mesenchymal stem cells (hMSCs) on the CaPNPs-coated Ti64 scaffolds indicated that the improved hydrophilicity was beneficial for the attachment and growth of cells in vitro. The Ti6Al4V/CaPNPs scaffold supported an increase in the alkaline phosphatase (ALP) activity of cells. In addition to the favourable cell proliferation and differentiation, Ti6Al4V/CaPNPs scaffolds displayed increased mineralization compared to non-coated Ti6Al4V scaffolds. Thus, the developed composite 3D scaffolds of Ti6Al4V functionalized with CaPNPs are promising materials for different applications related to bone repair. 

  • 4.
    Khrapov, D.
    et al.
    National Research Tomsk Polytechnic University, Tomsk, Russia.
    Surmeneva, M.
    National Research Tomsk Polytechnic University, Tomsk, Russia.
    Koptioug, Andrei
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Management and Mechanical Engineering.
    Evsevleev, S.
    Federal Institute for Materials Research and Testing (BAM), Berlin, Germany.
    Lé Onard, F.
    Federal Institute for Materials Research and Testing (BAM), Berlin, Germany.
    Bruno, G.
    Federal Institute for Materials Research and Testing (BAM), Berlin, Germany.
    Surmenev, R.
    National Research Tomsk Polytechnic University, Tomsk, Russia.
    X-ray computed tomography of multiple-layered scaffolds with controlled gradient cell lattice structures fabricated via additive manufacturing2019Conference paper (Refereed)
    Abstract [en]

    In this paper we report on the characterization by X-ray computed tomography of calcium phosphate (CaP) and polycaprolactone (PCL) coatings on Ti-6Al-4V alloy scaffolds used as a material for medical implants. The cylindrical scaffold has greater porosity of the inner part than the external part, thus, mimicking trabecular and cortical bone, respectively. The prismatic scaffolds have uniform porosity. Surface of the scaffolds was modified with calcium phosphate (CaP) and polycaprolactone (PCL) by dip-coating to improve biocompatibility and mechanical properties. Computed tomography performed with X-ray and synchrotron radiation revealed the defects of structure and morphology of CaP and PCL coatings showing small platelet-like and spider-web-like structures, respectively. 

  • 5.
    Mårtensson, Anna
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Management and Mechanical Engineering.
    Snyder, Kristen
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Management and Mechanical Engineering.
    Ingelsson, Pernilla
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Management and Mechanical Engineering.
    Interlinking Lean and Sustainability: How ready are leaders?2019In: The TQM Journal, ISSN 1754-2731, E-ISSN 1754-274X, Vol. 31, no 2, p. 136-149Article in journal (Refereed)
    Abstract [en]

    Purpose: The purpose of this paper is to explore evidence of interlinkages between Lean and sustainability among organisational leaders in the early stages of Lean implementation.

    Design/methodology: A multiple-site case study was conducted to study the connections between Lean and sustainable development during the implementation stages of a Lean practice. In-depth interviews were conducted with managers about their knowledge and understanding of the interlinkages between Lean and sustainable development. The findings were then used as an analytic frame to determine whether these interlinkages were present in the organisation.

    Findings: Evidence of interlinkages between Lean and sustainable development was found; however, their presence was incomplete and inconsistent across clinics.

    Research implications: Insights from the research can help organisations plan for the implementation of Lean practice, particularly when a sub-goal is to achieve sustainable development.

    Originality/value: The study shows the importance of focusing on managers’ knowledge and understanding of the interlinkages between Lean and sustainable development when implementing Lean in order to utilise Leans full potential to achieve sustainability.

  • 6.
    Norris, Karl
    et al.
    Univ Lancaster, Lancaster, England.
    Mishukova, Oksana I.
    Natl Res Tomsk Polytech Univ, Tomsk, Russia.
    Zykwinska, Agata
    IFREMER, Nantes, France.
    Colliec-Jouault, Sylvia
    IFREMER, Nantes, France.
    Sinquin, Corinne
    IFREMER, Nantes, France.
    Koptioug, Andrei
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Management and Mechanical Engineering.
    Cuenot, Stephane
    Univ Nantes, Nantes, France.
    Kerns, Jemma G.
    Univ Lancaster, Lancaster, England.
    Surmeneva, Maria A.
    Natl Res Tomsk Polytech Univ, Tomsk, Russia.
    Surmenev, Roman A.
    Natl Res Tomsk Polytech Univ, Tomsk, Russia.
    Douglas, Timothy E. L.
    Univ Lancaster, Lancaster, England; Univ Lancaster, Lancaster, England.
    Marine Polysaccharide-Collagen Coatings on Ti6Al4V Alloy Formed by Self-Assembly2019In: Micromachines, ISSN 2072-666X, E-ISSN 2072-666X, Vol. 10, no 1, article id 68Article in journal (Refereed)
    Abstract [en]

    Polysaccharides of marine origin are gaining interest as biomaterial components. Bacteria derived from deep-sea hydrothermal vents can produce sulfated exopolysaccharides (EPS), which can influence cell behavior. The use of such polysaccharides as components of organic, collagen fibril-based coatings on biomaterial surfaces remains unexplored. In this study, collagen fibril coatings enriched with HE800 and GY785 EPS derivatives were deposited on titanium alloy (Ti6Al4V) scaffolds produced by rapid prototyping and subjected to physicochemical and cell biological characterization. Coatings were formed by a self-assembly process whereby polysaccharides were added to acidic collagen molecule solution, followed by neutralization to induced self-assembly of collagen fibrils. Fibril formation resulted in collagen hydrogel formation. Hydrogels formed directly on Ti6Al4V surfaces, and fibrils adsorbed onto the surface. Scanning electron microscopy (SEM) analysis of collagen fibril coatings revealed association of polysaccharides with fibrils. Cell biological characterization revealed good cell adhesion and growth on bare Ti6Al4V surfaces, as well as coatings of collagen fibrils only and collagen fibrils enhanced with HE800 and GY785 EPS derivatives. Hence, the use of both EPS derivatives as coating components is feasible. Further work should focus on cell differentiation.

  • 7.
    Popov, Vladimir V.
    et al.
    Israel Institute of Metals, Haifa, Israel.
    Katz-Demyanetz, Alexander
    Israel Institute of Metals, Haifa, Israel.
    Koptioug, Andrei
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Management and Mechanical Engineering.
    Bamberger, Menachem
    Israel Institute of Technology, Haifa, Israel.
    Selective electron beam melting of Al0.5CrMoNbTa0.5 high entropy alloys using elemental powder blend2019In: Heliyon, ISSN 2405-8440, Vol. 5, no 2, article id e01188Article in journal (Refereed)
    Abstract [en]

    High Entropy Alloys (HEAs) is a novel promising class of multi-component materials which may demonstrate superior mechanical properties useful for high-temperature applications. Despite the high potential of HEAs, their production is complicated, using pre-alloyed powders in powder metallurgy route. This significantly complicates development and implementation of refractory BCC solid solution based HEAs. The present paper reports on experiments aiming at production of Al0.5CrMoNbTa0.5 multi-principle alloy using powder bed beam based additive manufacturing. Samples were manufactured using Selective Electron Beam Melting (SEBM) additive manufacturing technique from a blend of elemental powders aiming at achieving microstructure with high configurational entropy. Though it was not possible to achieve completely homogeneous microstructure, the as-printed material was composed of the zones with two multi-component solid solutions, which differed only by Al content confirming in situ alloying. The process parameters optimization was not carried out and the as-print material contained a notable amount of residual porosity. It was possible to reach lower porosity level using heat treatment at 1300 °C for 24 hours, however undesirable alloy composition changes took place. The main conclusion is that the production of the Al0.5CrMoNbTa0.5 multi-principle alloy from elemental powder blends using SEBM technique is achievable, but the process parameter optimization rather than post-process heat treatment should be performed to reduce the porosity of samples. 

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