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  • 1.
    Bujtar, Peter
    et al.
    Southern General Hospital, Glasgow.
    Simonovics, Janos
    Southern General Hospital, Glasgow.
    Koptyug, Andrey
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Ecotechnology and Sustainable Building Engineering.
    George, Sandor
    Southern General Hospital, Glasgow.
    Varadi, Karoly
    Southern General Hospital, Glasgow.
    Emerging manufacturing bioengineering technologies 2: Scaffold designing experiment using titanium scaffolds2014In: British Journal of Oral & Maxillofacial Surgery, ISSN 0266-4356, E-ISSN 1532-1940, Vol. 52, no 8, p. e60-e61Article in journal (Refereed)
    Abstract [en]

    Substantial volume defects of the head and neck oftenrequire customized solutions to improve quality of life likefree flap transfers.Titanium and its alloys are versatile materialsproviding the feature of osteointegration. The conditionswhich facilitate the deposition of lamellar bone are underextensive research. Our project aimed to determine whethertitanium can function as a scaffold - unlike simple plates - toenhance bone regeneration for load bearing structures. Thereaction of stem cells to scaffolds with varying stiffness willbe presented.Additive manufacturing were used to produce a variety ofscaffolds to optimize titanium structures. Electric beam melting(EBM) manufacturing allowed us to optimize the elasticmodulus (Young) of the titanium to match with cadaveric 

    bone from a previous project. Multidirectional mechanicaltests were performed on the various designs of titanium cellstructures (n=80). The predictability and quality of manufacturingwas assessed statistically and also with scanningelectron microscope (SEM).The results demonstrated structures matching the mechanicalproperties of bone and even anisotropy as our resultssuggest 3GPa elasticity. This allows the possibility to buildregenerating bone with predictable properties. In addition,predictable patterning - unlike etching and sandblasting - ofmicroscopic (nano) features found to be significant and nonhomogenous simple repetitive patterns provide better cellularresponse.The benefit that tissue engineering techniques offer isdecreased morbidity, relative independence from donor site,with a highly specific and customized shape. Titanium basedreconstruction constructs seems to offer an alternative futurefor bony reconstruction.

  • 2.
    Bäckström, Mikael
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Carlsson, Peter
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Danvind, Jonas
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Koptioug, Andrei
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Sundström, David
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Tinnsten, Mats
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    A New Wind Tunnel Facility Dedicated to Sports Technology Research and Development2016In: Procedia Engineering, Elsevier, 2016, Vol. 147, p. 62-67Conference paper (Refereed)
    Abstract [en]

    It is desirable to test sportswear and sports equipment at exactly the same conditions experienced during use. Although outdoor tests are in many cases the most adequate, they are at the same time quite complex, demand special measurement technology and wearable equipment. Results of such tests are often hard to interpret due to large variations because of rapidly varying ambient conditions and individual specifics of human objects, among other factors, which are hard or impossible to control. One common alternative is provided through indoor tests made in a stable, controlled environment. Controlling such parameters as temperature, wind speed and direction, air humidity with indoor facilities intended to replicate ambient conditions, and designed to house large objects, is a complex undertaking. Furthermore, replicating seasonal conditions complicates matters even more. A significant amount of research and development related to the operation of sports and other related equipment at high speeds and windy conditions has been carried out in wind tunnels with different degrees of climatic realism. However, the majority of such facilities are designed and constructed for the automotive industry, the aerospace industry and for marine research. A new wind tunnel facility, opened in March 2015 at the Sports Tech Research Centre at Mid Sweden University, is currently among the very few facilities in the world designed under the direct control of sports technology specialists and dedicated primarily to research and development within sports, outdoor clothing and footwear as well as equipment development and testing. The main goal when constructing this dedicated facility has been to successfully replicate ambient conditions for training and equipment testing in environments with controlled wind speed, temperature (+4 to +35°C) and precipitation (from fine mist to heavy downfall). The wind tunnel facility houses the largest moving belt in Sweden (5 m long and 2.7 m wide) which can be adjusted for leveled, uphill and downhill motion. The moving belt is placed in a 10 m2 test section in which the wind speed can be adjusted to match belt speed or independently up to 55 km/h (without narrowing the test section). A fog and rain system, mounted in the test section, can generate rainy conditions varying from fine mist to heavy monsoon. It is also possible to open the facility in order to allow experiments to be performed in wide range of outdoor, ambient conditions. This paper presents the basic parameters of the new wind tunnel facility. As this facility is open for wider international cooperation, we also report the general directions of current research and the future work planned to be carried out at this facility.

  • 3.
    Bäckström, Mikael
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering, Physics and Mathematics.
    Koptioug, Andrei
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering, Physics and Mathematics.
    Tinnsten, Mats
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering, Physics and Mathematics.
    People and Skis2006In: Science-First Hand, ISSN 1810-8520, no 3, p. 110-125Article in journal (Other (popular science, discussion, etc.))
  • 4.
    Bäckström, Mikael
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Koptyug, Andrey
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Automatic Pacenotes2013Patent (Other (popular science, discussion, etc.))
  • 5.
    Bäckström, Mikael
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Tinnsten, Mats
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Koptyug, Andrey
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Rännar, Lars-Erik
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Carlsson, Peter
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Danvind, Jonas
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Wiklund, Håkan
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Sports Technology Education at Mid Sweden University2013In: 6TH ASIA-PACIFIC CONGRESS ON SPORTS TECHNOLOGY (APCST), Elsevier, 2013, Vol. 60, p. 214-219Conference paper (Refereed)
    Abstract [en]

    In present paper we would like to share some experiences of building new education in Sports Technology at MidSweden University and the results of 10 years of successfully running it in Östersund. The Sports Technologyeducation at Mid Sweden University started at Campus Östersund in 2003 as a part of the curriculum of theEngineering Department. This specialization was initially at the three-year Bachelor level, and later it was extendedto an additional two-year Master level. Aiming at the quality of Sports Technology education, three keystones areunderlying its process, representing the solid knowledge base, capacity to be flexible in problem solving and the usean innovative approaches. The Department unites researches with a background in both natural sciences andengineering disciplines, having a wide experience of working with and within the industry, equally active in researchand teaching. The unique constellation of the profiles forming the Department include not only the SportsTech®group, being “the backbone”, but also the Ecology and Eco-technology, and Quality Technology groups bringing theexcellence and extra competence needed to assure the quality of the Sports Technology education. We were the firsthigher education institution in Sweden to give this kind of education program and now some other SwedishUniversities have followed us. Our success can be measured by a number of graduates taking good jobs in theindustry. We also enjoy a steady flow of new students coming from all parts of Sweden, and Sports Technologyeducation stays among the most desirable ones in the country.

  • 6. Carle, Fredrik
    et al.
    Koptioug, Andrei
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering and Sustainable Development.
    Portable rescue device and a method for locating such a device2007Patent (Other (popular science, discussion, etc.))
    Abstract [en]

    A portable rescue device and a method for locating, by means of a first rescue device set in a search mode, a second rescue device set in a distress mode. In the method, a distress signal carrying a device identification is received from said second rescue device. A first bearing and a second bearing to the second rescue device are obtained. The first and second bearings are taken from a first and a second position, respectively. A distance between these positions is determined. A current distance and a current bearing to the second rescue device are determined on basis of the first and second bearings and the distance. The current bearing and the current distance are communicated to a user of the first rescue device. The portable rescue device is used for performing the method and for that purpose it includes a first communication unit for distress signal transmission and reception; a compass; a processor; a user interface; and a mode switch for switching between a search mode and a distress signal mode. The first communication device has an antenna structure that provides directional capability.

  • 7.
    Carlsson, Peter
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Ainegren, Mats
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Tinnsten, Mats
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Sundström, David
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Esping, Björn
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Koptioug, Andrey
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Bäckström, Mikael
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Cross-Country Ski2015In: The Engineering Approach to Winter Sports / [ed] Braghin F., Cheli F., Maldifassi S., Melzi S. and Sabbioni E., Springer, 2015, p. 107-152Chapter in book (Other academic)
    Abstract [en]

    Cross-country skiing, biathlon and ski orienteering are competitive sports with practitioners who are mostly from countries in the northern hemisphere. The competition season is during the time when the ground is covered with snow, which roughly extends from mid-November to late March. During the rest time of the year, which is a long preparatory period of training for the skiers before the competition season, the skiers use roller skis for dryland training with the aim of imitating skiing on snow. Furthermore, over the last few decades, fairly specific indoor testing methods for cross-country skiers have become possible due to the development of treadmills that allow roller skiing using classical and freestyle techniques.

  • 8.
    Chudinova, E.
    et al.
    Tomsk Polytechnic University, Institute of Physics and Technologies, Lenina ave., 30, Tomsk, Russian Federation .
    Surmeneva, M.
    Tomsk Polytechnic University, Institute of Physics and Technologies, Lenina ave., 30, Tomsk, Russian Federation .
    Koptioug, Andrei
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Sharonova, A.
    Tomsk Polytechnic University, Institute of Physics and Technologies, Lenina ave., 30, Tomsk, Russian Federation .
    Loza, K.
    Inorganic Chemistry and Center for Nanointegration Duisburg-Essen (CeNIDE), University of Duisburg-Essen, Essen, Germany .
    Surmenev, R.
    Tomsk Polytechnic University, Institute of Physics and Technologies, Lenina ave., 30, Tomsk, Russian Federation .
    Surface modification of additive manufactured Ti6Al4V alloy with Ag nanoparticles: Wettability and surface morphology study2016In: IOP Conference Series: Materials Science and Engineering, Institute of Physics Publishing (IOPP), 2016, Vol. 116, no 1, article id 012004Conference paper (Refereed)
    Abstract [en]

    In this work, the use of electrophoretic deposition to modify the surface of Ti6Al4V alloy fabricated via additive manufacturing technology is reported. Poly(vinylpyrrolidone) (PVP)-stabilized silver nanoparticles (AgNPs) had a spherical shape with a diameter of the metallic core of 100±20 nm and ζ -potential -15 mV. The AgNPs- coated Ti6Al4V alloy was studied in respect with its chemical composition and surface morphology, water contact angle, hysteresis, and surface free energy. The results of SEM microphotography analysis showed that the AgNPs were homogeneously distributed over the surface. Hysteresis and water contact angle measurements revealed the effect of the deposited AgNPs layer, namely an increased water contact angle and decreased contact angle hysteresis. However, the average water contact angle was 125° for PVP-stabilized-AgNPs-coated surface, whereas ethylene glycol gave the average contact angle of 17°. A higher surface energy is observed for AgNPs-coated Ti6Al4V surface (70.17 mN/m) compared with the uncoated surface (49.07 mN/m).

  • 9.
    Chudinova, Ekaterina
    et al.
    Tomsk Polytechnic University, Tomsk, Russia.
    Surmeneva, Maria
    Tomsk Polytechnic University, Tomsk, Russia.
    Koptioug, Andrei
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Skoglund, Per
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Surmenev, Roman
    Tomsk Polytechnic University, Tomsk, Russia.
    Additive manufactured Ti6Al4V scaffolds with the RF-magnetron sputter deposited hydroxyapatite coating2016In: Journal of Physics: Conference Series, Institute of Physics Publishing (IOPP), 2016, Vol. 669, article id 012004Conference paper (Refereed)
    Abstract [en]

    Present paper reports on the results of surface modification of the additively manufactured porous Ti6Al4V scaffolds. Radio frequency (RF) magnetron sputtering was used to modify the surface of the alloy via deposition of the biocompatible hydroxyapatite (HA) coating. The surface morphology, chemical and phase composition of the HA-coated alloy were studied. It was revealed that RF magnetron sputtering allows preparing a homogeneous HA coating onto the entire surface of scaffolds.

  • 10.
    Chudinova, Ekaterina
    et al.
    Tomsk Polytechnic University, Tomsk, Russia.
    Surmeneva, Maria
    Tomsk Polytechnic University, Tomsk, Russia.
    Koptyug, Andrey
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Selezneva, Irina
    Institute of Theoretical and Experimental Biophysics, Russian Academy of Sciences, Puschino.
    Skoglund, Per
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Syrtanov, M
    Tomsk Polytechnic University, Tomsk, Russia.
    Surmenev, Roman
    Tomsk Polytechnic University, Tomsk, Russia.
    In Vitro Assessment of Hydroxyapatite Coating on the Surface of Additive Manufactured Ti6Al4V Scaffolds2017In: Materials Science Forum, ISSN 0255-5476, E-ISSN 1662-9752, Vol. 879, p. 2444-2449Article in journal (Refereed)
    Abstract [en]

    Custom orthopedic and dental implants may be fabricated by additive manufacturing (AM), for example using electron beam melting technology. This study is focused on the modification of the surface of Ti6Al4V alloy coin-like scaffolds fabricated via AM technology (EBM®) by radio frequency (RF) magnetron sputter deposition of hydroxyapatite (HA) coating. The scaffolds with HA coating were characterized by Scanning Electron microscopy, X-ray diffraction. HA coating showed a nanocrystalline structure with the crystallites of an average size of 32±9 nm. The ability of the surface to support adhesion and the proliferation of human mesenchymal stem cells was studied using biological short-term tests in vitro. In according to in vitro assessment, thin HA coating stimulated the attachment and proliferation of cells. Human mesenchymal stem cells cultured on the HA-coated scaffold also formed mineralized nodules.

  • 11.
    Chudinova, Ekaterina
    et al.
    Tomsk Polytechnic University, Tomsk, Russia.
    Surmeneva, Maria
    Tomsk Polytechnic University, Tomsk, Russia.
    Koptyug, Andrey
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Skoglund, Per
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Sharanova, A
    Tomsk Polytechnic University, Tomsk, Russia.
    Loza, K
    University of Duisburg-Essen, Germany.
    Epple, M
    University of Duisburg-Essen, Germany.
    Surmenev, Roman
    Tomsk Polytechnic University, Tomsk, Russia.
    Hydroxyapatite coating and silver nanoparticles assemblies on additively manufactured Ti6Al4V scaffolds2015Conference paper (Other academic)
  • 12.
    Cronskär, Marie
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering and Sustainable Development.
    Rännar, Lars-Erik
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering and Sustainable Development.
    Bäckström, Mikael
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering and Sustainable Development.
    Koptioug, Andrei
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering and Sustainable Development.
    Application of electron beam melting to titanium hip stem Implants2008In: / [ed] Katalinic, B., Vienna: DAAAM International Vienna , 2008, p. 1559-1560Conference paper (Refereed)
    Abstract [en]

    The Free Form Fabrication Process (FFF) is nowadays an accepted technology widely used for prototyping and manufacturing. However, it is still in an expansive phase and new applications like direct manufacturing of implants are evolving continuously. Present work describes the possibilities provided by the electron beam melting (EBM) method for orthopedics; in particular hip stem implant manufacturing. The conventional machining used for individually adapted prostheses typically involves advanced milling with the drawback of removing up to 80% of the material. This paper addresses the economic feasibility of using an additive approach for the manufacturing of typical orthopedic implants. The studied implants were manufactured from biocompatible Ti-6Al-4V alloy using both EBM and conventional CNC technologies and compared according to material consumption, manufacturing time and cost.

  • 13.
    Douglas, T
    et al.
    LANCASTER UNIVERSITY, UK.
    Hempel, U
    INSTITUTE OF PHYSIOLOGICAL CHEMISTRY, TECHNISCHE UNIVERSITÄT DRESDEN, GERMANY.
    Żydek, J
    AGH UNIVERSITY OF SCIENCE AND TECHNOLOGY, KRAKOW, POLAND.
    Buchweitz, M
    TOMSK POLYTECHNIC UNIVERSITY, RUSSIA.
    Surmenev, Roman
    Tomsk Polytechnic University, Tomsk, Russia.
    Surmeneva, Maria
    Tomsk Polytechnic University, Tomsk, Russia.
    Koptioug, Andrey
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics. SportsTech Research Centre, Mid Sweden University.
    Pamula, E
    AGH UNIVERSITY OF SCIENCE AND TECHNOLOGY, KRAKOW, POLAND.
    Pectin Coatings on Titanium Alloy Samples Produced by Additive Manufacturing: Promotion of Human Bone Marrow Stromal Cell Proliferation2017In: Engineering of Biomaterials, ISSN 1429-7248, Vol. 143, p. 43-Article in journal (Refereed)
  • 14.
    Douglas, Timothy E. L.
    et al.
    Lancaster University, United Kingdom.
    Hempel, Ute
    Technische Universität Dresden, Germany.
    Żydek, Jagoda
    AGH University of Science and Technology, Kraków, Poland.
    Vladescu, Alina
    National Institute for Optoelectronics, Romania; National Research Tomsk Polytechnic University, Russia.
    Pietryga, Krzysztof
    AGH University of Science and Technology, Kraków, Poland.
    Kaeswurm, Julia A. H.
    University of Stuttgart, Germany.
    Buchweitz, Maria
    University of Stuttgart, Germany.
    Surmenev, Roman A.
    National Research Tomsk Polytechnic University, Russia.
    Surmeneva, Maria A.
    National Research Tomsk Polytechnic University, Russia.
    Cotrut, Cosmin M.
    National Research Tomsk Polytechnic University, Russia; University Politechnica of Bucharest, Romania.
    Koptioug, Andrei
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Management and Mechanical Engineering.
    Pamuła, Elzbieta
    AGH University of Science and Technology, Kraków, Poland.
    Pectin coatings on titanium alloy scaffolds produced by additive manufacturing: Promotion of human bone marrow stromal cell proliferation2018In: Materials letters (General ed.), ISSN 0167-577X, E-ISSN 1873-4979, Vol. 227, p. 225-228Article in journal (Refereed)
    Abstract [en]

    Ti6Al4V is a popular biomaterial for load-bearing implants for bone contact, which can be fabricated by additive manufacturing technologies. Their long-term success depends on their stable anchoring in surrounding bone, which in turn depends on formation of new bone tissue on the implant surface, for which adhesion and proliferation of bone-forming cells is a pre-requisite. Hence, surface coatings which promote cell adhesion and proliferation are desirable. Here, Ti6Al4V discs prepared by additive manufacturing (EBM) were coated with layers of pectins, calcium-binding polysaccharides derived from citrus (C) and apple (A), which also contained alkaline phosphatase (ALP), the enzyme responsible for mineralization of bone tissue. Adhesion and proliferation of human bone marrow stromal cells (hBMSC) were assessed. Proliferation after 7 days was increased by A-ALP coatings and, in particular, by C-ALP coatings. Cell morphology was similar on coated and uncoated samples. In conclusion, ALP-loaded pectin coatings promote hBMSC adhesion and proliferation. 

  • 15.
    Fisher, Tatjana A.
    et al.
    Tyumen Research Centre, Siberian Branch of the Russian Academy of Sciences, Tyumen, Russia.
    Petrov, Sergey A.
    Tyumen Research Centre, Siberian Branch of the Russian Academy of Sciences, Tyumen, Russia.
    Koptyug, Andrey
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Sukhovey, Yurij G.
    Institute of Immunology, Tyumen, Russia.
    Dotsenko, Evgenij L.
    Tyumen State University, Tyumen, Russia.
    A way to health through psycho-immunological wellbeing: Example of Indigenous People of Russian North2016In: Proc. IIId Intl Conference "Psychological Health of the Person: Life Resource and Life Potential", 2016Conference paper (Refereed)
    Abstract [en]

    The research was carried out into the changes within psychic and immune domains ofthe Russian Nenets people migrating from the traditional northern habitat (tundra) to urbanenvironment. It is noted that in the process of significantly changing lifestyle supposedlysingle ethnic group can be clearly sub-divided according to the differences in adaptationdynamics. This division reflects sociological differences and is connected to the psychoimmunologicalaspects. Thus, with the adaptation of forest Nenets to the new conditions ofexistence (from the tundra to the urban centers), we found a division of a whole ethnic groupinto two groups according to a social attribute, which is fixed at the psychophysiologicallevel. First, psychic and immune domains are not only sharing a number of commonfeatures but also can have deep evolutionary connections and can be governed by similarlaws. Second, the psyche and the immune system show the most important functions andproperties that ensure an effective existence, generalizing the values of adaptation, protectionand vitality into a single structure. Such a concept is closed to “wholeness” and “integrity” showing that the distribution of vital forces or body resources can adjust the condition orcope with the pre-illness or even disease.

  • 16.
    Frisk, Karin
    et al.
    Swerea KIMAB, Kista.
    Rännar, Lars-Erik
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Koptyug, Andrey
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Petterson, Niklas
    Swerea KIMAB, Kista.
    Persson, Daniel
    Swerea KIMAB, Kista.
    Leicht, Alexander
    Chalmers.
    Vattur Sundaram, Maheswaran
    Chalmers.
    Hrhya, Eduard
    Chalmers.
    Nyborg, Lars
    Chalmers.
    Ahlfors, Magnus
    Quintus Technologies, Västerås.
    Characterisation Of EBM-built Shelled Samples of Ti6Al4V Compacted by HIP2016Conference paper (Refereed)
  • 17. Greenslade, David
    et al.
    Koptyug, Andrey
    Symons, Martin
    Aspects of low-frequency low-field electron spin resonance1995In: Royal Society of Chemistry. Annual Reports on the Progress of Chemistry. Section C: Physical Chemistry, ISSN 0260-1826, Vol. 92, p. 3-21Article, review/survey (Other academic)
  • 18. Hemp, John
    et al.
    Sanderson, M. L.
    Koptioug, Andrei
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering, Physics and Mathematics.
    Liang, B.
    Sweetland, D. J.
    Al Rabeh, L. H.
    Problems in the Theory and Design of Electromagnetic Flowmeters for Dielectric Fluids: Part 1: Experimental Assessment of Static Charge Noise Levels and Signal-to-Noise Ratio2002In: Flow Measurement and Instrumentation, ISSN 0955-5986, E-ISSN 1873-6998, Vol. 13, no 4, p. 143-145Article in journal (Refereed)
    Abstract [en]

    This paper reports on experimental measurements of electrode signal noise spectra in an electromagnetic flowmeter designed for

    flow measurement of the dielectric liquid BP180. The design of the flowmeter tube and the detection electronics is described.

    Dependence of the noise spectra on flow rate, electrode dimensions and particle content of the liquid is reported. Implications for

    flowmeter tube design and for the choice of frequency of operation to achieve reasonable signal-to-noise ratios are explained.

  • 19.
    Jonsson, Peter
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Nilsson, Hans-Erik
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Koptioug, Andrei
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Dual band Fraktal Antenna for RFID Applications2005Conference paper (Refereed)
  • 20.
    Jonsson, Peter
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Nilsson, Hans-Erik
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Koptioug, Andrei
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Using Fractals to Obtain Antennas with High DirectivityManuscript (Other academic)
  • 21.
    Jonsson, Peter
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Nilsson, Hans-Erik
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Koptoiug, Andrei
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Genetically Engineered Dual band Antenna for RFID Applications2005Conference paper (Refereed)
  • 22. Koptioug, Andrei
    Application of the Time-Variable Feedback to the Input Amplifiers of Pulse Magnetic Resonance Spectrometers: Theoretical Considerations2002In: Applied Magnetic Resonance, ISSN 0937-9347, E-ISSN 1613-7507, Vol. 22, no 22/4, p. 513-537Article in journal (Refereed)
    Abstract [en]

    Analytical model for the optimization of the signal-to-noise (S/N) performance for the receiverwith input resonance circuit and variable feedback is developed. It is shown that by varyingthe feedback type and depth optimization of the receiver the best S/N performance could be achieved.This approach is based upon a resonator-receiver model with lumped elements. These assumptionsare relatively general for the model to be applicable for the design of both continuous and pulsereceivers in radio-frequency and microwave bands. The overall S/N performance of the receiver uponthe noise properties of its elements and the feedback settings in the input amplifier is studied fordifferent parameter settings. It is shown that the separate optimization of individual elements doesnot necessarily lead to the best S/N performance of the receiver, especially when bandwidth propertiesand noise contribution of the elements are substantially different. It is shown that critical couplingof the amplifier to the resonance structure could be far from optimum. In some cases the optimumS/N performance could be achieved with the coupling settings less than critical. But under the assumptionsmade the coupling over the critical value does not correspond to the best receiver S/Nperformance. Suggestions on the optimum architecture of magnetic resonance spectrometer receiverswith variable feedback are made.

  • 23.
    Koptioug, Andrei
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering and Sustainable Development.
    New Transmission Line Resonators for ESE1998In: EPR Newsletter, Vol. 9, no 3, p. 20-22Article in journal (Other academic)
  • 24.
    Koptioug, Andrei
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering, Physics and Mathematics.
    Antzutkin, Oleg
    Lindgren, M.
    Lund, Anders
    Optically detected ESR (OD ESR) of radical-ion pairs in coloured solutions: Observation of transient Trans-Azobenzene Radical Cation1993In: Applied Magnetic Resonance, ISSN 0937-9347, E-ISSN 1613-7507, Vol. 5, no 1, p. 77-86Article in journal (Refereed)
    Abstract [en]

    Trans-azobenzene dissolved in different liquid hydrocarbons absorbs fluorescence arising from all acceptors previously used in Fluorescence Detected Magnetic Resonance (FDMR) and Optically Detected ESR (OD ESR) spectroscopy making optical detection impossible. In this report a new acceptor,rubrene, having sufficient quantum yield of fluorescence in the red band 550–620 nm, has been proven successful. OD ESR spectra of the radical-ion pairtrans-azobenzene+/rubrene were detected in liquid squalane (2,6,10,15,19,23-hexamethyl-tetracosane) solution in the temperature range 294–243 K. The experimental isotropic hyperfine splittings of the radical cation oftrans-azobenzene (a N=1.4 mT) have been compared with those from MNDO/INDO calculations and with those of earlier work using freon matrix studies.

  • 25.
    Koptioug, Andrei
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Management and Mechanical Engineering.
    Bäckström, Mikael
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Management and Mechanical Engineering.
    Ainegren, Mats
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Management and Mechanical Engineering.
    Nilsson, Kajsa
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Management and Mechanical Engineering.
    Studying Moisture Transport Trough "Active" Fabrics Using Humidity-Temperature Sensor Nodes2018In: Proceedings, Volume 2, ISEA 2018: / [ed] Dr Hugo Espinosa, David R. Rowlands, Jonathan Shepherd, Professor David Thiel, 2018, Vol. 2, p. 230-, article id 6Conference paper (Refereed)
    Abstract [en]

    Active fabrics providing better comfort of the garments and footwear rapidly become an essential part of our life. However, only limited information about the performance of such fabrics is commonly available for the garment and footwear designers, and tests are often done only with the final products. Thus development of the objective testing methods for the fabric assemblies containing microporous membranes and garments using them is one of the important topics. Garment tests in the climate chamber when exercising in windy and rainy conditions with a set of temperature and humidity sensors placed over the body allow comparing manufactured garments for thermal and humidity comfort. To allow for better material testing a new laboratory setup was developed for studying the dynamics of the humidity transport through different fabrics at realistic conditions in extension of the existing ISO test procedure. Present paper discusses the experimental procedures and first results acquired with new setup.

  • 26.
    Koptioug, Andrei
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Bäckström, Mikael
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Rännar, Lars-Erik
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    3D-printing: a future “magic wand” for global manufacturing. How can we benefit from it today for sports and health care?2017In: Proceedings of the 5th International Congress on Sport Sciences Research and Technology Support, icSPORTS / [ed] Jan Cabri, Pedro Pezarat Correia, INSTICC Press, 2017Conference paper (Refereed)
    Abstract [en]

    3D-printing, or as it is also known, additive manufacturing (AM), is promising to be one of the determining manufacturing technologies of the present century. It is not a single technology but a family of rather different ones common in the way components are made, adding materials layer by layer. Additive manufacturing is already quite competitive to existing and well established technologies, but it also can provide unprecedented flexibility and complexity of shapes making components from the materials as different as cheese, chocolate and cream, live cells, concrete, polymers and metal. Many more materials we were not even thinking about few years ago are also becoming available in additive manufacturing, making it really believable that “only the sky is the limit”. During the time available for the keynote lecture, we will analyze the present position of AM in relation to other technologies, the features that make it so promising and its influence upon the part of our life we call sports and health, using the examples relevant to the Congress areas from computer systems to sports performance. Out of all enormities of materials available for different representatives of this manufacturing family we will concentrate at polymers and metals. AM technologies working with these two material families are already providing some unique solutions within the application areas relevant to the Congress' scope. We will also talk about some limitations inherent to the AM in polymers and metals to have the awareness that though the limit is somewhere “high in the sky”, it still exists.

  • 27.
    Koptioug, Andrei
    et al.
    Department of Biomedical Physics and Bioengineering, University of Aberdeen, Aberdeen, UK.
    Foster, Margaret
    Grigor’ev, Igor
    Lurie, David
    Khramtsov, Valerij
    McCallum, S.
    Panagiotelis, I.
    Nicholson, I.
    In Vivo Detection of a pH-Sensitive Nitroxide in the Rat Stomach by Low-Field ESR-Based Techniques2003In: Magnetic Resonance in Medicine, ISSN 0740-3194, E-ISSN 1522-2594, Vol. 49, no 3, p. 558-567Article in journal (Refereed)
    Abstract [en]

    A study was made of the in vivo detectability of a pH-sensitive, imidazolidine spin probe, and the efficacy of low-frequency electron spin resonance (ESR)-based techniques for pH measurement in vitro and in vivo in rats. The techniques used were longitudinally-detected ESR (LODESR) and field-cycled dynamic nuclear polarization (FC-DNP) for in vitro and in vivo measurements, and radiofrequency (RF)- and X-band ESR for comparisons in vitro. The spin probe was hexamethyl imidazolidine (HMI) with a pK of 4.6. All techniques detected HMI. Detection by FC-DNP implies coupling between the free radical and solvent water spins. Separations between the three spectral lines of the nitroxide radical, relative to measurement frequency, were consistent with theory. The overall spectrum width from unprotonated HMI (pH > pK) was greater than that from protonated agent (pH < pK). This was observed in vitro and in vivo. Longer-term studies showed that HMI is detectable and has the same spectral width (i.e., is at the same pH) up to 2 hr after gavage into the stomach, although the magnitude of the signal decreases rapidly during the first hour. These findings demonstrate the suitability of LODESR and FC-DNP for monitoring HMI and measuring pH in vivo. These techniques would be useful for monitoring disease and drug pharmacology in the living system.

  • 28.
    Koptioug, Andrei
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Hesselbom, Hjalmar
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Some Aspects of Modelling of Dense High Speed TL Interconnects for Printed Circuit Boards2003In: GigaHertz 2003: Proceedings from the Seventh Symposium, November 4–5, 2003, Linköping, Sweden, Linköping, 2003Conference paper (Other academic)
    Abstract [en]

    In this paper we present some results of the ongoing research aimed at studying the limitations attached to the increase in transmission line (TL) density for the high speed interconnects at the board, multi-chip module and on-chip integration levels. For any interconnect solution the important quality in the frequency band of interest is the signal to noise ratio obtainable, where noise could be due to additional amplification required, TL itself and any cross talk signal picked up by the line. First part of the paper deals with modeling the coupling between two TL sections in the attempt to formulate simple guidelines on how to chose the TL dimensions and adjacent trace separation to maintain reasonably low trace coupling. Second part of the paper deals with the influence of TL cross- sectional parameter upon the high frequency losses. Area efficiency parameter is introduced to allow the measure of the tradeoff between obtaining smaller loss (with wider central strips) and smaller cross talk in order to obtain the best possible throughput per board cross section at any bit error rate.

  • 29.
    Koptioug, Andrei
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Jonsson, Peter
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Sidén, Johan
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Olsson, Torbjörn
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Gulliksson, Mikael
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    On the behavior of printed RFID tag antennas, using conductive paint2003In: Antenn 03. Nordic Antenna Symposium, 13-15 May 2003 , Kalmar, Sweden, 2003, p. 371-374Conference paper (Other academic)
  • 30. Koptioug, Andrei
    et al.
    Reijerse, Edward
    Klaassen, A. A. K.
    Application of Time-Variable Feedback to the Input Amplifier of Pulse Magnetic Resonance Spectrometers: Experimental Studies2002In: Applied Magnetic Resonance, ISSN 0937-9347, E-ISSN 1613-7507, Vol. 22, no 4, p. 455-473Article in journal (Refereed)
    Abstract [en]

    Experimental research on the improvement of the sensitivity and time resolution of pulsedmagnetic resonance spectrometers is discussed. It is shown that application of a time-variable feedbackof a signal to the input of the receiver amplifier can decouple the "fixed" relationship betweenthe quality factor Q and the ringdown time of the resonance system. Experiments were performedwith low-frequency, radio-frequency and microwave pulse-type magnetic resonance receivers. Modificationsof an S/C-band electron spin echo modulation spectrometer carried out to check the “timevariablefeedback” performance is described. It is demonstrated that application of a time-variablefeedback can significantly reduce the ringdown time and improve the recovery properties of the magneticresonance receiver system. It is also demonstrated that the time-variable feedback can improvethe overall receiver sensitivity due to the fact that working bandwidth of the resonance system canbe optimized separately for the transmit and receive modes. Signal values could be increased at leastthree times and the signal-to-noise ratio about 1.5–2 times. The largest improvement is achieved withthe initially overcoupled resonator. Experimental spectra of test samples for different settings of thetime-variable feedback are shown.

  • 31.
    Koptioug, Andrei
    et al.
    Department of Bio-Medical Physics and Bio-Engineering, University of Aberdeen, Foresterhill, Aberdeen AB9 2ZD, United Kingdom..
    Reijerse, Edward
    Klaassen, A. K.
    New Transmission-Line Resonator for Pulsed EPR1997In: Journal of magnetic resonance, ISSN 1090-7807, E-ISSN 1096-0856, no 125, p. 369-371Article in journal (Refereed)
  • 32.
    Koptioug, Andrei
    et al.
    Institute of Chemical Kinetics and Combustion, Novosibirsk 630090, USSR.
    Saik, Vladimir
    Anisimov, Oleg
    Molin, Yurij
    Quantum beats in singlet-triplet transitions of radical pairs induced by a radio-frequency field1990In: Chemical Physics Letters, ISSN 0009-2614, E-ISSN 1873-4448, Vol. 165, no 2-3, p. 142-145Article in journal (Refereed)
    Abstract [en]

    This Letter reports on the experimental observation of quantum beats stimulated by a resonance radio-frequency field in the recombination luminescence of radical-ion pairs. The beat frequency for solutions of p-terphenyl in squalane increases linearly with rf-field amplitude in the range 1 to 10 G in a rotating frame. The beat frequency corresponds to the theoretically calculated one, with amplitude twice as low as the theoretical one. This is attributed to contributions from the recombination of spin-uncorrelated radical-ion pairs

  • 33.
    Koptioug, Andrei
    et al.
    aInstitute of Chemical Kinetics and Combustion, USSR Academy of Sciences, Novosibirsk 630090, USSR.
    Saik, Vladimir
    Anisimov, Oleg
    Molin, Yurij
    Antzutkin, Oleg
    Effect of External Magnetic Fields and Resonance Radio frequency Radiation on Radical Reactions1990In: Physica. B, Condensed matter, ISSN 0921-4526, E-ISSN 1873-2135, Vol. 164, no 1-2, p. 200-204Article in journal (Refereed)
    Abstract [en]

    It is well known that an external magnetic field can affect the rate of singlet-triplet transitions in a radical pair and hence its recombination probability in liquid. Resonance radiofrequency (RF) radiation induces quantum beats in the kinetics of radical pair recombination. At high RF field amplitudes the singlet-triplet transitions in radical pairs can be efficiently suppressed.

  • 34.
    Koptyug, A.
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering and Sustainable Development.
    Kuzmin, Leonid
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering and Sustainable Development.
    Experimental field studies of the cross-country ski running surface interaction with snow2011In: Procedia Engineering, Elsevier, 2011, Vol. 13, p. 23-29Conference paper (Refereed)
    Abstract [en]

    The ability of the cross-country skis to glide freely is of very high importance for both sports and recreational skiing. Significant body of research and development is nowadays devoted to the materials and treatment methods for improving gliding of the ski running surfaces, as well as to the related skiing techniques for optimal use of ski gliding. One of the common concepts here is that the most significant energy loss contribution in such interaction is caused by the pure interfacial friction of the ski running surface and the snow. But this interaction is quite complex and we have proposed that other channels of the energy loss can be of significance. Among the possibilities one can point out to the effects of the snow deformation under the skis, "dragging" of snow by the skis and damping of the ski vibrations by the snow. Present paper reports on the field experimental studies of the ski interaction with the snow. These studies are aiming at developing the measurement technology allowing the assessment of gliding properties of the cross-country skis when data are collected from the sensors placed into the ski track.

  • 35.
    Koptyug, Andrey
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering and Sustainable Development.
    Optical Detection of EPR Spectra of Radical-Ion Pairs in Weak Magnetic Fields1997In: Doklady Akademii Nauk, ISSN 0869-5652, Vol. 297, no 6, p. 1414-1417Article in journal (Refereed)
  • 36.
    Koptyug, Andrey
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering, Physics and Mathematics.
    Optical Detection of the Radical-Ion Pair Spectra in Weak Magnetic Fields1987In: Doklady Akademii Nauk, ISSN 0869-5652, Vol. 297, no 6, p. 1414-1418Article in journal (Refereed)
  • 37. Koptyug, Andrey
    Weak Field ESR Spectrometer1988In: Transactions of Siberian Branch of the USSR Academy of Sciences, Vol. 1, p. 121-124Article in journal (Refereed)
  • 38.
    Koptyug, Andrey
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Ainegren, Mats
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Experimental measurement of rifle dynamics during the range shooting of biathlon weapons2015In: Procedia Engineering: The Impact of Tecnology on Sport VI / [ed] Subic A., Fuss F.K., Alam F., Pang T.Y. and Takla M., Elsevier, 2015, Vol. 112, p. 349-354Conference paper (Refereed)
    Abstract [en]

    Some of the shooting training that biathletes implements takes place indoors, even in hotel rooms or at home, through so-called "dry firing" training. It involves imitating shooting at a target with real rifle but without ammunition, when the result is evaluated by various electronic devices counting the number of virtual hits. But dry firing cannot adequately represent real shooting, as it does not produce any rifle recoil, which significantly limits its value for the training. To reach a higher realism of the dry firing training a system mimicking the weapon recoil is therefore needed. Present research aims to overcome an existing lack of dataon the dynamics ofsmall caliber rifles recoil dynamics. Present paper describes first measurement results acquired in the controlled environment of the shooting range. Two types of experiments were carried out with firing freely suspended rifle and when backed with the force measurement device (load cell). Average recoil peak force values were reaching 5 kg, rising from zero forabout 10-15 ms and keeping altogether for about 30-40 ms. Corresponding energy going into the recoil motion of the rifle is found to be about 390 J. The measured values provide an adequate input for designing the devices mimicking the biathlon weapon recoil in dry firing training.

  • 39.
    Koptyug, Andrey
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Ainegren, Mats
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Bäckström, Mikael
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Schieber, Erika
    Persson, Jonas
    Possibility of modern humidity sensor application in the studies ofmoisture transport through the sports and outdoor garments2016In: icSPORTS 2016 - Proceedings of the 4th International Congress on Sport Sciences Research and Technology Support, Portugal: SciTePress, 2016, p. 51-58Conference paper (Refereed)
    Abstract [en]

    Sensor nodes containing pairs of temperature and humidity sensors were assessed as a mean of garmentperformance and comfort studies. Modern sensors are small, low weight and produce minimal disturbancewhen placed under the garments and in the footwear. Four sensor nodes were used to provide dynamicinformation about heat and humidity transfer properties of garments during the tests in realistic conditions.Pilot studies were carried out for the few models of cross country skiing garments and waders. Main studieswere carried out in the wind tunnel at Mid Sweden University having pivoted treadmill, temperature controland rain capacity. Additional experiments with the waders were carried out in a large water tank. Studies ofthe temperature and humidity dynamics under the garments containing microporous membranes illustratethe importance of recognizing main features of such materials. In particular, such membranes can onlytransport moisture from the side where humidity is higher. It means that garments and footwear containingsuch membranes will potentially behave differently when ambient air humidity changes. In particular,modern garments with incorporated microporous membranes being superior at low ambient air humidity canbe dramatically less effective for moisture transfer from the body in the rain.

  • 40.
    Koptyug, Andrey
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering, Physics and Mathematics.
    Ananiev, Leonid
    Äström, Johan
    How to Make Perfect Snow2006In: Science First Hand, ISSN 1810-8520, no 1 (7), p. 122-133Article in journal (Other (popular science, discussion, etc.))
    Abstract [en]

    “To the North Pole with own snow?” This kind of natural first reaction can be expected from the readers recollecting Andersen’s immortal ‘Snow Queen’, especially when they find out that the authors are living and working in central Sweden, about 500 km north of Stockholm (the altitude corresponding to the point about 100 kilometers north of Anchorage, Alaska). And it almost inevitably will be followed by, “Is 1 m of snow not enough?” Actually, the answer is, “It depends…” If you are digging your car out in the cold morning after a heavy snowfall for a third time in a week, even 5 cm of snow, sure thing, is more than enough. But if you are waiting till mid-January to put on your beloved downhill gear and to get to the favorite slope, and then outdoor temperature drops below —25° С and stays like this till mid-April, after which the snow melts in a week, let’s see what you would say… So, it should not be surprising that there is someone willing to pay for the thing falling from the Heavens ‘for free’. And, consequently, there are people who make the equipment for ‘manufacturing’ snow. When using proper snowmaking equipment, alpine ski resorts, including the ones in Siberia and central Sweden, extend he season up to four months (two in early winter and two in spring). And these are commonly the best four months for skiing, not too cold and not too warm — perfect for a family outing.

  • 41.
    Koptyug, Andrey
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Bergemann, Claudia
    University Medical Center Rostock, Dept. of Cell Biology, Schillingallee 69, D-18057 Rostock, Germany.
    Lange, Regina
    Interface Research Group, Institute for Electronic Appliances and Circuits, University of Rostock, A.-Einstein-Str. 2, D-18059 Rostock, Germany.
    Jaggi, Victor-Emanuel
    University of Applied Sciences Northwestern Switzerland FHNW, School of Life Sciences, Gründenstrasse 40, CH-4132 Muttenz, Switzerland.
    Rännar, Lars-Erik
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Nebe, J. Barbara
    University Medical Center Rostock, Dept. of Cell Biology, Schillingallee 69, D-18057 Rostock, Germany.
    Osteoblast Ingrowth into Titanium Scaffolds made by Electron Beam Melting2014In: Materials Science Forum, ISSN 0255-5476, E-ISSN 1662-9752, Vol. 783-786, p. 1292-1297Article in journal (Refereed)
    Abstract [en]

    Present paper describes early findings from the study of Ti-6Al-4V scaffolds additively manufactured using electron beam melting (EBM®) technology and the influence of surface topography on the initial stages of cell acceptance. The surface topography of the components made by additive manufacturing (AM) processes including EBM® are often hard to control within the desired feature size range without post-processing. Two groups of experiments studying the behavior of human osteoblast-like cells (MG63) on samples with different surface roughness were carried out in vitro: Ti-6Al-4V samples only powder-blasted, and Ti-6Al-4V samples additionally electrochemically polished. The cell migration into powder-blasted Ti-6Al-4V 3D scaffolds with different shapes and dimensions of the lattice structures were studied.

  • 42.
    Koptyug, Andrey
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics. SportsTech Research Centre, Mid Sweden University.
    Burkett, Brendan
    School of Health and Sport Sciences, University of Sunshine Coast, Australia.
    Editorial for the special issue technology for disability sport2016In: Sports Engineering, ISSN 1369-7072, E-ISSN 1460-2687, Vol. 19, no 3, p. 1p. 139-139Article in journal (Refereed)
    Abstract [en]

    Major sporting events, including the Olympic Games, areroutinely ‘‘brought to our homes’’ by modern mass media.The Paralympic Games follow the Olympic Games, and areanother major competition event. With each summer andwinter Paralympic games, such as the 2012 London and the2014 Sochi Paralympic games, the elite sporting achievementsmay be new to many of us. The athletic skill andpersistent determination drive Paralympic sports. A commonthread with the Paralympic athlete is the reliance onsome form of technology to compete on the world stage.Engineering and technology have become an essentialpart of modern-day sports. This partnership is necessary forcoach and athlete as they prepare for, and participate incompetitions. From the audience perspective, sports technologycan provide a new perspective and insight into thecompetition and its highlights. The quality of equipment,garments and footwear, and their interaction with athlete’sbody become an integrated part of the winning strategy inmodern sports.For the athlete with a disability, engineering and technologyhas always been an essential partnership. Withoutthe assistive devices, the disabled athlete is not able toprepare and participate in sport. Equipment design fordisabled athletes is often more complex and customizedthan for many other applications.The fundamental principles for the use of equipment inParalympic Sport are safety, fairness, universality andphysical prowess. While the safety criterion is relativelystraightforward, fulfilling other three can be challenging forthe designers and classifiers. It is often impossible to showif the performance of an athlete with a particular assistivedevice is determined by the athlete rather than by ‘‘theimpact of technology and equipment’’. By working togetherwith all parties the sports engineering community canprovide affordable safe and reliable assistive devices,technologies for training and rehabilitation, and animproved basis for objective classification.Research papers in this issue deal with a wide variety ofsubjects and are multidisciplinary. Four papers in thisspecial issue are related to the athlete and equipmentinteraction, which is important in all sports but needsspecial care and precision when working with of paraathletes.The remaining five papers are related to issuesimportant for the training and classification.We hope that these contributions will improve theintegration between athlete and equipment, will provide abetter basis for proper classification of the equipment andassistive devices, and, according to the International ParalympicCommittee vision, will ‘‘enable para-athletes toachieve sporting excellence and inspire and excite theworld’’.

  • 43.
    Koptyug, Andrey
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering and Sustainable Development.
    Bäckström, Mikael
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering and Sustainable Development.
    Rännar, Lars-Erik
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering and Sustainable Development.
    Tin Man- Making Spare Parts for Human Body2012In: Science First Hand, ISSN 1810-3960, Vol. 44, no 2, p. 45-57Article in journal (Other (popular science, discussion, etc.))
    Abstract [en]

    In this paper we would like to illustrate the present and future of additive manufacturing technologies in medicine, in particular when helping the humanity to acquire some needed "spare parts", using some examples provided by the Sports Technology (SportsTech) Group at the Department of Engineering and Sustainable Development of the Mid Sweden University.

  • 44.
    Koptyug, Andrey
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering and Sustainable Development.
    Bäckström, Mikael
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering and Sustainable Development.
    Tinnsten, Mats
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering and Sustainable Development.
    Cross-country Ski Vibrations: Loaded Vs Unloaded Skis2012Conference paper (Other academic)
  • 45.
    Koptyug, Andrey
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Bäckström, Mikael
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Tinnsten, Mats
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Gliding-induced ski vibrations: Approaching proper modeling2014In: Procedia Engineering, 2014, Vol. 72, p. 539-544Conference paper (Refereed)
    Abstract [en]

    Phenomena of the ski and snow boards vibrations generated in gliding are known for years. In the cross country and jumping skis such vibrations are not very obvious but can play quite positive role reducing the effective gliding friction. The research into the nature of friction-induced vibrations and the factors influencing their frequencies and magnitudes is driven by the desire to control them for improving ski gliding performance. Significant amount of experimental data acquired in the field and laboratory studies is already available making it possible to formulate certain qualitative conclusions. But so far it did not bring comprehensive understanding of the phenomenon and specifically of the mechanisms controlling such vibrations. Modeling is one of the potent tools allowing to deeper understand experimentally studied phenomena and it can provide much stronger quantitative prediction capacity. Present paper discusses possible approaches to modeling of the phenomenon and first results of constructing simplified models. © 2014 The Authors.

  • 46.
    Koptyug, Andrey
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering and Sustainable Development.
    Bäckström, Mikael
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering and Sustainable Development.
    Tinnsten, Mats
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering and Sustainable Development.
    Laboratory Setup for the Cross Country Ski Vibrations Measurements: Methodology and First Results2012Conference paper (Refereed)
  • 47.
    Koptyug, Andrey
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Bäckström, Mikael
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Tinnsten, Mats
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Technology and Management, Mechanical Engineering and Mathematics.
    Studies into the Mechanisms of the Cross-country Ski Vibrations and Possible Models of the Phenomenon2013In: 6TH ASIA-PACIFIC CONGRESS ON SPORTS TECHNOLOGY (APCST), Elsevier, 2013, Vol. 60, p. 40-45Conference paper (Refereed)
    Abstract [en]

    Field and laboratory measurements show a presence of intense cross-country ski vibrations during free gliding. Thereare indications that such vibrations may and indeed do affect the average friction forces and thus should affect the skigliding. Our studies into the nature of these vibrations and the factors influencing their frequencies and magnitudesare driven by the desire to control them for improving ski gliding performance. The complexity of the correspondingresonance system, represented by constant interaction of the skier, the skis and the snow, and the mechanisms of thevibration excitation, most probably dominated by the stochastic forces caused by a stick-slip character of the friction,demand new approaches to the modelling and experiments. Present paper describes some results of the experimentallaboratory studies of such vibrations, and possible approaches to their modelling following the routes suggested inmodelling of the similar phenomena.

  • 48.
    Koptyug, Andrey
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering and Sustainable Development.
    Bäckström, Mikael
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering and Sustainable Development.
    Tinnsten, Mats
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering and Sustainable Development.
    Carlsson, Peter
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering and Sustainable Development.
    Cross-country ski vibrations and possible mechanisms of their influence on the free gliding2012In: Procedia Engineering, ISSN 1877-7058, E-ISSN 1877-7058, Vol. 34, p. 473-478Article in journal (Refereed)
    Abstract [en]

    Present paper describes the results of experimental studies on the self-induced and forced vibrations of loaded cross country skis and presents the discussion on the possible mechanisms causing such vibrations and the ways they can influence the friction between the ski running surface and the snow. Studied vibrations of gliding skis are most probably caused by the frictional effects. Mechanisms involved are similar to the ones causing the brake disc squeal or the violin string excitation by the bow. Major factors responsible for the development of these vibrations such as micro roughness of the surfaces, nonlinearities in the material properties, thermo-elastic instabilities and instabilities due to decreasing friction with increasing sliding velocity are also common for the case of gliding skis. The results of this study indicate that the ski vibration pattern both in amplitude and in frequency could influence the ski gliding properties. Though it seems quite feasible that the control of the cross country ski vibrations can improve the gliding performance, further systematic studies are needed to confirm it and to formulate the consecutive strategies of cross country ski design improvement.

  • 49.
    Koptyug, Andrey
    et al.
    Inst. of Chem. Kinetics & Combustion, Acad. of Sci., Novosibirsk, Russia.
    Grishin, Yurij
    S-band magnetron-based accessory for optical detection of ESR spectra of radiation-induced radical-ion pairs1994In: Measurement science and technology, ISSN 0957-0233, E-ISSN 1361-6501, Vol. 5, no 4, p. 363-370Article in journal (Refereed)
    Abstract [en]

    In the development of the technique of reaction yield detected magnetic resonance (RYDMR), a novel simple accessory for optical detection of ESR (OD ESR), based on the S-band continuous wave magnetron generator is presented. Basic technical requirements for the RYDMR accessories are discussed. The successful use of an S-band magnetron as a microwave source for RYDMR experiments is reported for the first time. Along with the use of a simple loop-gap resonator it permits the studies of both polar and non-polar samples with good sensitivity and field resolution. With the help of this accessory, OD ESR spectra of some new acceptors, acridin and fluorescein, were detected and some new solvents, poly(ethylene glycol) and paraffin-based high-voltage insulator oil, were successfully utilized.

  • 50.
    Koptyug, Andrey
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Engineering and Sustainable Development.
    Mamontov, Eugen
    Sukhovey, Yury
    Dynamic modeling of tumor development2011In: Science First Hand, ISSN 1810-3960, Vol. 6, no 42, p. 44-51Article in journal (Refereed)
123 1 - 50 of 102
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