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  • 1.
    Al-Saadi, Munir
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Materialens processteknologi.
    Jönsson, Pär
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Materialens processteknologi.
    Sandberg, Fredrik
    Karasev, Andrey
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Microstructure characterisation in alloy 8252018Konferansepaper (Fagfellevurdert)
  • 2. Beyhaghi, M.
    et al.
    Kiani-Rashid, A.
    Khaki, J. V.
    Kashefi, M.
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Influences of mechanical activation and heating rate on reaction processes in combustion synthesis of NiAl-Al 2 O 3 composites2019Inngår i: Powder Technology, ISSN 0032-5910, E-ISSN 1873-328X, Vol. 346, s. 237-247Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This paper investigates the combustion synthesis of NiAl-Al 2 O 3 composites by the heating of Ni, NiO and Al powder mixture from 20 °C to 1300 °C. The influence of mechanical activation (without and with 1 h) and heating rate (20 °C/min and 40 °C/min) on thermal events in combustion synthesis process are investigated. Thermal events are assessed by Differential Thermal Analysis (DTA), X-Ray Diffractometry (XRD) and Scanning Electron Microscopy (SEM). By heating the sample without mechanical activation, exothermic reaction of NiO reduction by Al and Ni-Al intermetallic phases (Al 3 Ni, Al 3 Ni 2 , AlNi and AlNi 3 ) production happened in the presence of molten Al at 870 °C as one DTA peak. Mechanical activation causes occurrence of these reactions more separately at lower temperatures (590 °C and 630 °C). By decrement in the heating rate, these reactions happened in a more dispersed way at lower temperatures (590 °C and 630 °C). The reaction temperature for nickel aluminides formation in the presence of eutectic melt of AlNi 3 -Al is constant regardless of heating rate in mechanically activated powder. A seven-stage mechanism for reactions in a mechanically activated sample at a heating rate of 40 °C/min is proposed. Initially, by heating of the powder, an exothermic reaction between nickel oxide and aluminum and also nickel and aluminum occurs at 590 °C in solid state. NiO is consumed totally and Al 2 O 3 is produced from the nickel oxide reduction by aluminum. Nickel aluminide phases are formed from reactions between aluminum and primary nickel and also from aluminum and nickel formed by aluminothermic reduction of nickel oxide. With continuation of heating process, Al-Al 3 Ni eutectic transition happens at 630 °C and results in the liquid phase formation. Presence of the molten phase accelerates the exothermic nickel aluminides formation reactions. Aluminum is consumed totally in this stage and more intermetallic phases are developed. By increasing the temperature, diffusion is enhanced. The remaining Al 3 Ni melts at 856 °C. This small amount of molten phase slightly enhances exothermic reactions between nickel aluminides and leads the system towards the equilibrium phase. After this event, reactions progresses gradually. The nickel core shrinks by the diffusion progressively and the whole nickel aluminides system undergoes a gradual evolution towards the NiAl equilibrium phase.

  • 3. Beyhaghi, Maryam
    et al.
    Kashefi, Mehrdad
    Kiani-Rashid, Alireza
    Khaki, Jalil Vandati
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    In-situ synthesis of nanostructured NiAl-Al2O3 composite coatings on cast iron substrates by spark plasma sintering of mechanically activated powders2015Inngår i: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 272, s. 254-267Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Bulk pellets and coatings of NiAl-Al2O3 composites on gray cast-iron substrates are fabricated by spark plasma sintering (SPS) at 700 and 1050 degrees C using a highly reactive powder-mixture of "13Al + 8Ni + 3NiO" activated by 1 hour ball milling. The reactions are complete in all cases, except for the coating produced at the lower temperature. At both temperatures, the pellets experienced internal explosions, due to the intense reactivity of the powder, producing inhomogeneous microstructures. At 1050 degrees C, the heat absorption from the substrates resulted in damped reactions producing homogenous, dense, fully reacted NiAl-Al2O3 composite coatings with crystallite sizes of 73 nm and 65 nm, respectively. A bond layer forms by growing into the substrate and diffusion of Fe, Ni, Al and Si is found in the coating, the bond layer and the substrate. In all cases, the adherence of coatings to substrates is good with no signs of pores or cracks. The products are examined by LOM, SEM, EDS, XRD, Vickers hardness indentation and scratch testing. The SPS process is analyzed by FEM-simulations using a homogeneous reaction model where the properties are given by linear combinations of reactants and products. Melting enthalpies of all compounds are taken into consideration when calculating the maximum reaction temperatures for various combustion times and gap conductivities between powder and graphite parts of the SPS apparatus. The maximum reaction temperatures are calculated for pellets and for coatings on cast iron substrates and also for mixtures of activated and already reacted powder. The results are shown as isotherms. Comparison to experiments suggests a reaction time exceeding 1 s and a gap conductivity of less than 10 kW.m(-2).K-1. For ignition at 500 degrees C, the adiabatic temperature is estimated to 2056 degrees C.

  • 4.
    Beyhaghi, Maryam
    et al.
    Islamic Azad Univ, Fac Engn, Dept Met & Ceram, Mashhad Branch, Mashhad, Iran..
    Khaki, Jalil Vandati
    Ferdowsi Univ Mashhad, Dept Met & Mat Engn, Mashhad 917751111, Iran..
    Manawan, Maykel
    Univ Indonesia, Dept Phys, Depok 16424, Indonesia.;Politekn Negeri Jakarta, Energy Engn, Depok 1624, Indonesia..
    Kiani-Rashid, Alireza
    Ferdowsi Univ Mashhad, Dept Met & Mat Engn, Mashhad 917751111, Iran..
    Kashefi, Mehrdad
    Ferdowsi Univ Mashhad, Dept Met & Mat Engn, Mashhad 917751111, Iran..
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    In-situ synthesis and characterization of nano-structured NiAl-Al2O3 composite during high energy ball milling2018Inngår i: Powder Technology, ISSN 0032-5910, E-ISSN 1873-328X, Vol. 329, s. 95-106Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this work, synthesis of NiAl-Al2O3 nanocomposite powders via the mechanosynthesis route and by using Ni, NiO and Al is investigated. Ignition of the reaction inside the ball-mill vial happens after 110 min; NiO is totally finished and NiAl and Al2O3 as product phases are formed. After 10 h of ball milling, raw materials are totally used in the reaction and only product phases exist in the vial. By continuing the ball milling process to 60 h, better mixing of the synthesized phases and decrement in their crystallite sizes plus partide size are observed. Crystallite sizes of the product phases are in the nanometer range in all ball milling times. Crystallite sizes of NiAl and Al2O3 after 10 h are around 11 nm and 19 nm respectively, and these are reduced to around 8 nm for both phases after 60 h of ball milling.

  • 5. Beyhaghi, Maryam
    et al.
    Kiani-Rashid, Ali-Reza
    Kashefi, Mehrdad
    Khaki, Jalil Vandati
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Mekanisk metallografi.
    Effect of powder reactivity on fabrication and properties of NiAl/Al2O3 composite coated on cast iron using spark plasma sintering2015Inngår i: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 344, s. 1-8Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Powder mixtures of Ni, NiO and Al are ball milled for 1 and 10 h. X-ray diffractometry and differential thermal analysis show that while ball milling for 1 h produced mechanically activated powder; 10 h ball milling produced NiAl and Al2O3 phases. Dense NiAl/Al2O3 composite coatings are formed on gray cast iron substrate by spark plasma sintering (SPS) technique. The effect of powder reactivity on microstructure, hardness and scratch hardness of NiAl/Al2O3 coatings after SPS is discussed. Results show that in the coating sample made of mechanically activated powder in situ synthesis of NiAl/Al2O3 composite coating is fulfilled and a thicker well-formed diffusion bond layer at the interface between coating and substrate is observed. The diffusion of elements across the bond layers and phase evolution in the bond layers were investigated. No pores or cracks were observed at the interface between coating layer and substrate in any of samples. Higher Vickers hardness and scratch hardness values in coating made of 10 h ball milled powder than in coating fabricated from 1 h ball milled powder are attributed to better dispersion of Al2O3 reinforcement particles in NiAl matrix and nano-crystalline structure of NiAl matrix. Scratched surface of coatings did not reveal any cracking or spallation at coating-substrate interface indicating their good adherence at test conditions.

  • 6. Dalborg, M.
    et al.
    Jacobson, K.
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Mekanisk metallografi.
    Methods for determining the spatial distribution of oxidation in ultra-high molecular-weight polyethylene prostheses2007Inngår i: Polymer degradation and stability, ISSN 0141-3910, E-ISSN 1873-2321, Vol. 92, nr 3, s. 437-447Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Oxidative degradation is a well-known problem for UHMWPE used in prostheses. The aim of the present study has been to find suitable techniques to study the spatial distribution of this oxidation in 8 retrieved acetabular cups. The techniques used were visual examination using an optical microscope and computer scanner, FTIR mapping, imaging chemiluminescence, and staining with SO2 and HCl. The staining technique is based on a previous study which showed that by treating oxidized UHMWPE with SO2 followed by heat treatment, the hydroperoxides present in the sample react with the SO2 and discolor the sample. The intensity of this discoloring is, at low levels of oxidation, proportional to the amount of hydroperoxides and accordingly to the level of the oxidation. The same study also showed that staining a sample with hot HCl resulted in a brown discoloration which was proportional to the amount of carbonyls. It was found that the staining techniques do not give as much information about the chemical and physical changes in the material as FTIR mapping but have a great advantage in better spatial resolution of the oxidation and are also much quicker and easier to use. Imaging chemiluminescence turned out not to be a suitable method to use, compared to the other two, since it gives less information and is more difficult to interpret. When interpreting the results from the different techniques used, it was found that all cups showed the typical oxidation behavior of gamma sterilized UHMWPE. All cups but one showed substantial wear of the articulating surface but very little backside wear. Examination of the oxidation and whitening profile suggests that at least some of the oxidation must have occurred in vivo.

  • 7.
    Ekström, Madeleine
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Mekanisk metallografi.
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Mekanisk metallografi.
    High-temperature corrosion fatigue of a ferritic ductile cast iron in inert and corrosive environments at 700˚C2015Inngår i: International Journal of Cast Metals Research, ISSN 1364-0461, E-ISSN 1743-1336Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In the present work, low-cycle fatigue testing of a ferritic ductile cast iron named SiMo51 has been carried out in three atmospheres: argon, air and a synthetic diesel exhaust-gas at 700°C. The fatigue life was reduced up to 80% in the worst case. Two crack growth mechanisms were observed and directly linked to oxidation. At weak oxidation, a nodule-to- nodule crack growth occurred. At strong oxidation, crack growth occurred through oxidized material in front of the crack tip. 

  • 8.
    Ekström, Madeleine
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Mekanisk metallografi.
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Mekanisk metallografi.
    High-temperature mechanical- and fatigue properties of cast alloys intended for use in exhaust manifolds2014Inngår i: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 616, s. 78-87Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In the present work materials for use in exhaust manifolds of heavy-duty diesel engines were tested in air from 20 to 1000 degrees C with respect to mechanical properties. Two cast irons, SiMo51 and Ni-resist D5S, four austenitic cast steels, HF, A3N, HK30 and HK-Nb, and one ferritic cast steel, 1.4509 were studied. The experimental work included thermal conductivity, thermal expansion, uniaxial stress-strain testing, low-cycle fatigue testing up to 30,000 cycles and fractography. Below 500 degrees C, SiMo51 is superior. At higher temperatures, a transition from elastic to plastic strain dominance was observed for the cast irons, reducing their performance. Carbide-forming elements increase heat conductivity and result in a dendrite-like fracture surfaces during fatigue testing. The austenitic steels are superior only at higher temperatures.

  • 9.
    Ekström, Madeleine
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Mekanisk metallografi.
    Jonsson, Stefan
    The influence of Cr and Ni on the high-temperature low-cycle fatigue behavior of a ferritic cast ductile iron2012Inngår i: Conference proceeding for 7th International Conference on Low Cycle Fatigue, 2012Konferansepaper (Fagfellevurdert)
    Abstract [en]

     The current material in exhaust manifolds for heavy-duty diesel engines: a Si- and Mo-alloyed, ferritic ductile cast iron, named SiMo51, is operating close to its limits and improvements are needed. Thus, in the present study, the effects on mechanical properties of adding Cr and Ni to SiMo51 has been investigated with focus on low-cycle fatigue behavior in air, at temperatures up to 700°C. Both additions improve fatigue life but reduce elongation. Adding 1wt% Ni improves fatigue life up to 250°C whereas adding 0.5wt% Cr improves fatigue life at room temperature, only.

  • 10.
    Ekström, Madeleine
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Mekanisk metallografi.
    Szakalos, Peter
    KTH, Skolan för kemivetenskap (CHE), Kemi, Yt- och korrosionsvetenskap.
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Mekanisk metallografi.
    Influence of Cr and Ni on High-Temperature Corrosion Behavior of Ferritic Ductile Cast Iron in Air and Exhaust Gases2013Inngår i: Oxidation of Metals, ISSN 0030-770X, E-ISSN 1573-4889, Vol. 80, nr 5-6, s. 455-466Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Due to an expected temperature increase of the exhaust gases in heavy-duty engines in order to meet future emission regulations, there is a need to develop materials that can operate at higher temperatures. The exhaust manifold in the hot end of the exhaust system is specifically affected since the most common material today, SiMo51, is already operating close to its limits. Accordingly, the effects of Cr and Ni-additions on the high-temperature corrosion resistance of this material in air and exhaust gases were examined. It was found that the addition of 0.5 and 1 wt% Cr improved the oxidation resistance in air at 700 and 800 A degrees C by the formation of an SiO2 barrier layer as well as a Cr-oxide at the oxide/metal interface. However, no Cr-oxide was detected after exposure to exhaust gases, probably due to a water vapor-assisted evaporation of Cr from the oxide. The addition of 1 wt% Ni resulted in a deteriorated SiO2 barrier layer and reduced oxidation resistance.

  • 11.
    Ekström, Madeleine
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Materialteknologi.
    Thibblin, A.
    Tjernberg, A.
    Blomqvist, C.
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Mekanisk metallografi.
    Evaluation of internal thermal barrier coatings for exhaust manifolds2015Inngår i: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 272, s. 198-212Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Seven different thermal barrier coatings (TBC) intended for coating the inside of an exhaust manifold to reduce its material temperature were studied. They comprised five plasma-sprayed (mullite, forsterite, La2Zr2O7, 8YSZ, and nanostructured 8YSZ) and two sol-gel composite (one sprayed and one dipped) coatings, which were examined for their thermal insulation properties and oxidation and spallation resistance. Thermal cyclic tests in air and in exhaust gas in a diesel test engine showed that thermal expansion mismatch between substrate and TBC was most crucial for TBC lifetime. Moreover, thermal modeling indicated that it is possible to reduce the material temperature by 50 °C, which is important for improving the fatigue life of exhaust manifolds. This reduction can be obtained with a 0.2 mm thick TBC with thermal conductivity close to 0.1 W/m K, or a 3–6 mm thick TBC with thermal conductivity 1.5–3 W/m K. 

  • 12.
    Ekström, Madeleine
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Mekanisk metallografi.
    Thibblin, Anders
    Scania CV AB.
    Tjernberg, Anders
    Scania CV AB.
    Blomqvist, C.
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Mekanisk metallografi.
    Evaluation of internal thermal barrier coatings for exhaust manifolds2015Inngår i: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 272, s. 198-212Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Seven different thermal barrier coatings (TBC) intended for coating the inside of an exhaust manifold to reduce its material temperature were studied. They comprised five plasma-sprayed (mullite, forsterite, La2Zr2O7, 8YSZ, and nanostructured 8YSZ) and two sol-gel composite (one sprayed and one dipped) coatings, which were examined for their thermal insulation properties and oxidation and spallation resistance. Thermal cyclic tests in air and in exhaust gas in a diesel test engine showed that thermal expansion mismatch between substrate and TBC was most crucial for TBC lifetime. Moreover, thermal modeling indicated that it is possible to reduce the material temperature by 50°C, which is important for improving the fatigue life of exhaust manifolds. This reduction can be obtained with a 0.2mm thick TBC with thermal conductivity close to 0.1W/m K, or a 3–6mm thick TBC with thermal conductivity 1.5–3W/m K.

  • 13.
    Ekström, Madeleine
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Mekanisk metallografi.
    Zhu, B.
    Szakalos, P.
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Mekanisk metallografi.
    High-temperature corrosion of materials for cast exhaust components2014Inngår i: 7th European Corrosion Congress, 2014Konferansepaper (Annet vitenskapelig)
  • 14.
    Ekström, Madeleine
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Mekanisk metallografi.
    Zhu, B.
    Scania.
    Szakalos, Peter
    KTH, Skolan för kemivetenskap (CHE), Kemi, Yt- och korrosionsvetenskap.
    Jonsson, Stefan
    An electrochemical impedance spectroscopy study on the effect of condensate on oxides formed on a 25Cr/20Ni cast stainless steel in exhaust environmentsManuskript (preprint) (Annet vitenskapelig)
    Abstract [en]

     Condensation of diesel exhaust gases inside an exhaust- or turbo manifold may occur during cold-start and cooling of an engine, resulting in acidic liquid covering the oxide surfaces inside the manifolds. In the present study, the interaction between a chloride-containing exhaust-gas condensate of pH 2.4 and oxide scales formed on a 25Cr/20Ni cast stainless steel in air and in two different exhaust environments, 10%H2O-5%O2-85%N2 and 10%H2O-5%CO2-85%N2, at 900°C has been examined by means of electrochemical impedance spectroscopy, EIS. Interpretation of impedance spectra was coupled to oxide scale structures, revealed by SEM, EDX, XRD and GDOES, and to metal release studies using ICP. It was observed that the acidic condensate caused oxide spallation, followed by corrosion of the underlying metal surface for all test samples. The metal release rate of the oxide scale and underlying alloy was found to decrease at longer immersion times (>1h), most likely due to precipitation of corrosion products on the surfaces. EIS combined with equivalent circuit fitting showed to be a useful technique in describing the electric properties of the oxide scales, suggesting oxidation in H2O/O2 to result in formation of oxide scales being more resistive compared to the other environments. This was coupled to higher thickness and higher defect density, which correlated well with oxide scale analysis.

  • 15.
    Filipovic, Mirjana
    et al.
    National Post Gradual School in Metal Forming, Dalarna University.
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Experimental and Numerical study of the Evolution of Artifical Inner Defects in Stainless Steel rolled in a Wire Rod Block.Manuskript (preprint) (Annet vitenskapelig)
  • 16.
    Grankvist, R.
    et al.
    Karolinska Inst, Dept Clin Neurosci, Stockholm, Sweden.;Karolinska Univ Hosp, Dept Neuroradiol, S-17176 Stockholm, Sweden..
    Jensen-Urstad, M.
    Karolinska Inst, Karolinska Univ Hosp, Dept Cardiol, Stockholm, Sweden..
    Clarke, J.
    Karolinska Inst, Dept Cell & Mol Biol & Med, Stockholm, Sweden..
    Lehtinen, M.
    Karolinska Inst, Dept Cell & Mol Biol & Med, Stockholm, Sweden..
    Little, P.
    Karolinska Inst, Dept Clin Neurosci, Stockholm, Sweden.;Karolinska Univ Hosp, Dept Neuroradiol, S-17176 Stockholm, Sweden..
    Lundberg, J.
    Karolinska Inst, Dept Clin Neurosci, Stockholm, Sweden.;Karolinska Univ Hosp, Dept Neuroradiol, S-17176 Stockholm, Sweden..
    Arnberg, F.
    Karolinska Inst, Dept Clin Neurosci, Stockholm, Sweden.;Karolinska Univ Hosp, Dept Neuroradiol, S-17176 Stockholm, Sweden..
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap. Karolinska Inst, Dept Clin Neurosci, Stockholm, Sweden.;Karolinska Univ Hosp, Dept Neuroradiol, S-17176 Stockholm, Sweden.
    Chien, K. R.
    Karolinska Inst, Dept Cell & Mol Biol & Med, Stockholm, Sweden..
    Holmin, S.
    Karolinska Inst, Dept Clin Neurosci, Stockholm, Sweden.;Karolinska Univ Hosp, Dept Neuroradiol, S-17176 Stockholm, Sweden..
    Superselective endovascular tissue access using trans-vessel wall technique: feasibility study for treatment applications in heart, pancreas and kidney in swine2019Inngår i: Journal of Internal Medicine, ISSN 0954-6820, E-ISSN 1365-2796, Vol. 285, nr 4, s. 398-406Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Objectives. With the emergence of targeted cell transplantation and gene therapy, there is a need for minimally invasive tissue access to facilitate delivery of therapeutic substrate. The objective of this study was to demonstrate the suitability of an endovascular device which is able to directly access tissue and deliver therapeutic agent to the heart, kidney and pancreas without need to seal the penetration site. Methods. In vivo experiments were performed in 30 swine, including subgroups with follow-up to evaluate complications. The previously described trans-vessel wall (VW) device was modified to be sharper and not require tip detachment to seal the VW. Injections into targets in the heart (n = 13, 24-h follow-up n = 5, 72-h follow-up n = 3), kidney (n = 8, 14-day follow-up n = 3) and pancreas (n = 5) were performed. Some animals were used for multiple organ injections. Follow-up consisted of clinical monitoring, angiography and necropsy. Transvenous (in heart) and transarterial approaches (in heart, kidney and pancreas) were used. Injections were targeted towards the subepicardium, endomyocardium, pancreas head and tail, and kidney subcapsular space and cortex. Results. Injections were successful in target organs, visualized by intraparenchymal contrast on fluoroscopy and by necropsy. No serious complications (defined as heart failure or persistent arrhythmia, haemorrhage requiring treatment or acute kidney injury) were encountered over a total of 157 injections. Conclusions. The trans-VW device can achieve superselective injections to the heart, pancreas and kidney for delivery of therapeutic substances without tip detachment. All parts of these organs including the subepicardium, pancreas tail and renal subcapsular space can be efficiently reached.

  • 17.
    Hillert, Mats
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Prediction of a quasiternary section of a quaternary phase diagram2008Inngår i: The SGTE Casebook: Thermodynamics At Work, Elsevier, 2008, 2, s. 114-117Kapittel i bok, del av antologi (Fagfellevurdert)
  • 18. Jaff, N.
    et al.
    Grankvist, R.
    Muhl, L.
    Chireh, A.
    Sandell, M.
    Jonsson, S.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Arnberg, F.
    Holmin, S.
    Endothelial cell sampling coupled with transcriptomic analysis in a swine model of mechanical thrombectomy2017Inngår i: Journal of the Neurological Sciences, ISSN 0022-510X, E-ISSN 1878-5883, Vol. 381, s. 106-107Artikkel i tidsskrift (Annet vitenskapelig)
  • 19.
    Jaff, Nasren
    et al.
    Karolinska Inst, Dept Clin Neurosci, SE-17176 Stockholm, Sweden..
    Grankvist, Rikard
    Karolinska Inst, Dept Clin Neurosci, SE-17176 Stockholm, Sweden..
    Muhl, Lars
    Karolinska Inst, Dept Med Biochem & Biophys MBB, Stockholm, Sweden..
    Chireh, Arvin
    Karolinska Inst, Dept Clin Neurosci, SE-17176 Stockholm, Sweden..
    Sandell, Mikael
    Karolinska Inst, Dept Clin Neurosci, SE-17176 Stockholm, Sweden..
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Arnberg, Fabian
    Karolinska Univ Hosp, Dept Neuroradiol, SE-17176 Stockholm, Sweden..
    Eriksson, Ulf
    Karolinska Inst, Dept Med Biochem & Biophys MBB, Stockholm, Sweden..
    Holmin, Staffan
    Karolinska Inst, Dept Clin Neurosci, SE-17176 Stockholm, Sweden.;Karolinska Univ Hosp, Dept Neuroradiol, SE-17176 Stockholm, Sweden..
    Transcriptomic analysis of the harvested endothelial cells in a swine model of mechanical thrombectomy2018Inngår i: Neuroradiology, ISSN 0028-3940, E-ISSN 1432-1920, Vol. 60, nr 7, s. 759-768Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In mechanical thrombectomy (MT) for ischemic stroke, endothelial cells (ECs) from intracranial blood vessels adhere to the stent retriever device and can be harvested. However, understanding the molecular biology and the role of the endothelium in different pathological conditions remains insufficient. The purpose of the study was to characterize and analyze the molecular aspect of harvested ECs using cell culture and transcriptomic techniques in an MT swine model relevant to clinical ischemic stroke. In swine, preformed thrombi were injected into the external carotid and subclavian arteries to occlude their branches. MT was performed according to clinical routine. The stent retriever device and thrombus were treated with cell dissociation buffer. The resulting cell suspension was analyzed by immunohistochemistry and was cultured. Cultured cells were analyzed using single-cell RNA sequencing (scRNA-seq) after fluorescence-activated cell sorting (FACS). A total number of 37 samples were obtained containing CD31-positive cells. Cell culture was successful in 90% of samples, and the cells expressed multiple typical EC protein markers. Eighty-nine percent of the sorted cells yielded high-quality transcriptomes, and single-cell transcriptomes from cultured cells showed that they expressed typical endothelial gene patterns. Gene expression analysis of ECs from an occluded artery did not show distinctive clustering into subtypes. ECs harvested during MT can be cultured and analyzed using single-cell transcriptomic techniques. This analysis can be implemented in clinical practice to study the EC gene expression of comorbidities, such as hypertension, diabetes mellitus, and metabolic syndrome, in patients suffering from acute ischemic stroke.

  • 20.
    Janis, Jesper
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Tillämpad processmetallurgi.
    Nakajima, Keiji
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Tillämpad processmetallurgi.
    Karasev, Andrey
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Tillämpad processmetallurgi.
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Tillämpad processmetallurgi.
    Inoue, Ryo
    Jönsson, Pär
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Tillämpad processmetallurgi.
    Effects of Nitride-Oxide Particles on Solidified Structure inFe-20mass%Cr Alloy Deoxidised with Ti/M (M = Zr or Ce)2010Rapport (Annet vitenskapelig)
    Abstract [en]

    The ratio of equiaxed grains on a cross section and average grain sizein Fe-20mass% Cr alloy deoxidised with Ti/M (M = Zr or Ce) were studiedas function of nitrogen content and particle characteristics such as sizedistribution, morphology and composition. Fe-20mass%Cr alloys weremelted at 1600ºC, deoxidised, cooled to 1400ºC followed by waterquenching. The particles were investigated on a surface of film filter afterelectrolytic extraction of metal samples with 10%AA electrolyte. It wasfound that the number of particles increases with increasing the N content.The as-cast solidification structure and grain size were clearly affected bythe number of oxide and oxide-nitride particles in Ti/Zr experiments. Theeffect in the Ti-Ce case was almost undetectable.

  • 21.
    Janis, Jesper
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Nakajima, Keiji
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Karasev, Andrey
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Tillämpad processmetallurgi.
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Mekanisk metallografi.
    Inoue, Ryo
    Jönsson, Pär Göran
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Tillämpad processmetallurgi.
    Effects of Primary Oxide and Oxide-Nitride Particles on the Solidification Structure in a Fe-20 mass%Cr Alloy Deoxidised with Ti and M (M = Zr or Ce)2013Inngår i: ISIJ International, ISSN 0915-1559, E-ISSN 1347-5460, Vol. 53, nr 2, s. 221-229Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The ratio of equiaxed grains on a cross section and the size of equiaxed grains in a Fe-20 mass% Cr alloy deoxidised with Ti/M (M = Zr or Ce) were studied as function of nitrogen content and particle characteristics such as size distribution, morphology and composition. Fe-20 mass% Cr alloys were melted at 1 600 degrees C, deoxidised, and cooled to 1 400 degrees C followed by water quenching. Thereafter, the particles were separated from the matrix using electrolytic extraction using a 10%AA electrolyte and collected on a film-filter surface. The inclusion characteristics were determined using SEM. It was found that the number of particles increases with an increased N content. Furthermore, that the solidification structure was clearly affected by the number of primary oxide and oxide-nitride particles in the Ti/Zr deoxidation experiments. However, a similar effect could not be detected in the Ti/Ce deoxidation experiments.

  • 22.
    Kasedde, Hillary
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Mekanisk metallografi.
    Bäbler, Matthäus
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Energiprocesser.
    Kirabira, John Baptist
    Makerere University, Kampala, Uganda.
    Tilliander, Anders
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Tillämpad processmetallurgi.
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Mekanisk metallografi.
    Mineral recovery from Lake Katwe brines using isothermal evaporation2013Inngår i: International Mine Water Association Annual Conference 2013: Reliable Mine Water Technology / [ed] Adrian Brown, Linda Figueroa, Christian Wolkersdorfer, IMWA International Mine Water Association , 2013, s. 855-860Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Lake Katwe is a saline lake within the East African Rift system in Western Uganda, with a rich source of mineral salts. The present work aims at evaluating possibilities of future salt extraction from the lake deposit. An isothermal evaporation experiment was conducted on the lake brines. The precipitated salts were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) methods. Various economic salts such as thenardite, gypsum, mirabilite, burkeite, hanksite, anhydrite, trona, halite, nahcolite, thermonatrite, and soda ash precipitate from the lake brines. The experiments also reveal the sequence of mineral salt precipitation in the order sulfates→chlorides→carbonates.

  • 23.
    Kasedde, Hillary
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Tillämpad processmetallurgi. Makerere University, Kampala, Uganda.
    Kirabira, John Baptist
    Bäbler, Matthäus
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Energiprocesser.
    Tilliander, Anders
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Tillämpad processmetallurgi.
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Mekanisk metallografi.
    Phase developments during natural evaporation simulation of Lake Katwe brine based on Pitzer's model2014Konferansepaper (Fagfellevurdert)
  • 24.
    Kasedde, Hillary
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Mekanisk metallografi. Makerere University.
    Kirabira, John Baptist
    Makerere University.
    Bäbler, Mätthäus
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Energiprocesser.
    Tilliander, Anders
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Tillämpad processmetallurgi.
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Mekanisk metallografi.
    Characterization of brines and evaporites of Lake Katwe, Uganda2014Inngår i: Journal of African Earth Sciences, ISSN 0899-5362, Vol. 91, s. 55-65Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Lake Katwe brines and evaporites were investigated to determine their chemical, mineralogical and morphological composition. 30 brine samples and 3 solid salt samples (evaporites) were collected from different locations of the lake deposit. Several analytical techniques were used to determine the chemical composition of the samples including Inductively Coupled Plasma-Atomic Emission Spectrometry (ICP-AES), Inductively Coupled Plasma-Sector Field Mass Spectrometry (ICP-SFMS), ion chromatography, and potentiometric titration. The mineralogical composition and morphology of the evaporites was determined using X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. Physical parameters of the lake brines such as density, electrical conductivity, pH, and salinity were also studied. The results show that the lake brines are highly alkaline and rich in Na+, Cl-, CO32-, SO42-, and HCO3- with lesser amounts of K+, Mg2+, Ca2+, Br-, and F- ions. The brines show an intermediate transition between Na-Cl and Na-HCO3 water types. Among the trace metals, the lake brines were found to be enriched in B, I, Sr, Fe, Mo, Ba, and Mn. The solid salts are composed of halite mixed with other salts such as hanksite, burkeite and trona. It was also observed that the composition of the salts varies considerably even within the same grades.

  • 25.
    Kasedde, Hillary
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Mekanisk metallografi.
    Kirabira, John
    Mechanical Engineering, Makerere University, Uganda.
    Bäbler, Matthäus
    KTH, Skolan för kemivetenskap (CHE), Kemiteknik, Energiprocesser.
    Tilliander, Anders
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Tillämpad processmetallurgi.
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Mekanisk metallografi.
    A State of the Art Paper on Improving Salt Extraction from Lake Katwe Raw Materials In Uganda2012Rapport (Annet vitenskapelig)
    Abstract [en]

    The characteristics of Katwe salt lake are briefly discussed. The lake is the largest of the eight saline lakes in the Katwe-Kikorongo volcanic field and is a major source of salt production in Uganda. Today, salt production at the lake is carried out using traditional and artisanal mining methods. Attempts to mechanize the production of domestic and commercial grade salt at the lake were unsuccessful due to the use of a wrong technology. In this paper, the most common available technologies for salt extraction from brine are described. These are divided into four broad categories, namely thermal, membrane, chemical and hybrid processes. A review of the state of the art, previous research and developments in these technologies is presented. A detailed analysis of the processes used was done based on studies reported in the literature. From the analysis, it was observed that thermal salt production processes, especially distillation and solar evaporation have the highest share in installed capacities worldwide. Membrane technologies such as Electro-dialysis, Reverse Osmosis and chemical technologies have not found wide application in the commercial salt industry. Electro-dialysis and Reverse Osmosis have been used mainly as pre-concentration processes for subsequent thermal processes. Prospects for application of hybrid systems for salt production through integration of thermal desalting processes should be investigated for better performance efficiencies and recoveries at the salt lake.

  • 26. Kirabira, J. B.
    et al.
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Mekanisk metallografi.
    Drotz, M.
    Karathanasis, M.
    Norman, B.
    Properties of super-calendered (SC) paper filled with Mutaka kaolin, Uganda2009Inngår i: Paper Technology, ISSN 0306-252X, Vol. 50, nr 1, s. 11-16Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The experts from Makerere University (Mak) and the Royal Institute of Technology (KTH) evaluated three mineral deposits for the production of fireclay refractories in Uganda and found that the Mutaka kaolin deposit in Uganda is of extraordinary quality. Ten tons of raw kaolin was mined at the Mutaka deposit and shipped in a container to STFI-Packforsk, Sweden. The kaolin was first dry sieved in a shaker to remove sand, mica and large particles. The sieved material was mixed with fresh water to a dry content of 15% and hydrocycloned to separate and remove coarse particles. The paper machine trials were carried out at STFI-Packforsk on the EuroFEX paper machine. The results indicate that the potential of exploiting the Mutaka kaolin deposit for paper filling is high. Paper filled with Mutaka clay resulted in a slightly lower opacity, however, with an optimized particles size distribution, this could be improved.

  • 27.
    Kirabira, John Baptist
    et al.
    Makerere University.
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Byaruhanga, Joseph Kadoma
    Makerere University.
    Laboratory Benefication And Evaluation of Mutaka Kaolin from the Lake Victoria Region, UgandaInngår i: Applied Clay Science, ISSN 0169-1317, E-ISSN 1872-9053Artikkel i tidsskrift (Annet vitenskapelig)
  • 28.
    Kirabira, John Baptist
    et al.
    Makerere University.
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Mekanisk metallografi.
    Byaruhanga, Joseph Kadoma
    Makerere University.
    Powder characterization of high temperature ceramic raw materials in the Lake Victoria Region.2005Inngår i: Silicates industriels, ISSN 0037-5225, Vol. 70, nr 10-sep, s. 127-134Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Two main deposits of kaolin and one of fireclay, located in the Lake Victoria Region, Uganda, were investigated to assess their potential in the manufacture of refractory bricks. Raw- and processed sample powders were investigated by means of x-ray diffraction (XRD), thermal analysis (DTA-TG) and Scanning Electron Microscopy (SEM). In addition, the chemical composition, particle size distribution, density, and surface area of the powders were determined.

  • 29.
    Kirabira, John Baptist
    et al.
    Makerere University.
    Jonsson, Stefan
    KTH, Tidigare Institutioner, Materialvetenskap.
    Byaruhanga, Joseph Kadoma
    Makerere University.
    Production of Fireclay Refractories from Kaolinitic Clays of the Lake Victoria Region.2004Inngår i: Journal of the Australian Ceramic Society, ISSN 2510-1560, Vol. 40, s. 12-19Artikkel i tidsskrift (Annet vitenskapelig)
  • 30.
    Kirabira, John Baptist
    et al.
    Makerere University.
    Jonsson, Stefan
    KTH, Tidigare Institutioner                               , Materialvetenskap.
    Byaruhanga, Joseph Kadoma
    Makerere University.
    State of the art paper on development and manufacture of firebrick refractories from locally available alumnia-rich clays in Uganda.2003Rapport (Annet vitenskapelig)
  • 31.
    Kirabira, John Baptist
    et al.
    Makerere University, Kampala, Uganda .
    Wijk, Gunnar
    Höganäs Bjuf AB.
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Mekanisk metallografi.
    Byaruhanga, Joseph Kadoma
    Makerere University.
    Fireclay refractories from Ugandan kaolinitic minerals2006Inngår i: Steel Research International, ISSN 1611-3683, E-ISSN 1869-344X, ISSN 1611-3683, Vol. 77, nr 8, s. 531-536Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In the present work, two deposits, one of kaolin and the other of ball clay, located in Uganda were investigated for the possibility of manufacturing fireclay refractories. Kaolin from the Mutaka deposit was used as the main source of alumina while ball clay from Mukono was the main plasticizer and binder material. The formulated green body was consolidated by wet pressing and fired at 1350 degrees C in a tunnel kiln. Characterization of the sintered articles was done by X-ray diffraction, scanning electron microscopy, and chemical composition (ICP-AES). In addition, technological properties related to thermal conductivity, thermal shock, alkali resistance, water absorption, porosity, shrinkage, permanent linear change, linear thermal expansion, refractoriness under load, and cold crushing strength were determined. The properties of the articles manufactured from these naturally occurring raw minerals reveal that they compare favorably with those of parallel types. Thus, the raw materials can be exploited for industrial production.

  • 32. Little, P.
    et al.
    Kvist, O.
    Grankvist, R.
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Damberg, P.
    Söderman, M.
    Arnberg, F.
    Holmin, S.
    Preserved collateral blood flow in the endovascular M2CAO model allows for clinically relevant profiling of injury progression in acute ischemic stroke2017Inngår i: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 12, nr 1, artikkel-id e0169541Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Interventional treatment regimens have increased the demand for accurate understanding of the progression of injury in acute ischemic stroke. However, conventional animal models severely inhibit collateral blood flow and mimic the malignant infarction profile not suitable for treatment. The aim of this study was to provide a clinically relevant profile of the emergence and course of ischemic injury in cases suitable for acute intervention, and was achieved by employing a M2 occlusion model (M2CAO) that more accurately simulates middle cerebral artery (MCA) occlusion in humans. Twenty-five Sprague-Dawley rats were subjected to Short (90 min), Intermediate (180 min) or Extended (600 min) transient M2CAO and examined longitudinally with interleaved diffusion-, T2- and arterial spin labeling perfusion-weighted magnetic resonance imaging before and after reperfusion. We identified a rapid emergence of cytotoxic edema within tissue regions undergoing infarction, progressing in several distinct phases in the form of subsequent moderation and then reversal at 230 min (p < 0.0001). We identified also the early emergence of vasogenic edema, which increased consistently before and after reperfusion (p < 0.0001). The perfusion of the penumbra correlated more strongly to the perfusion of adjacent tissue regions than did the perfusion of regions undergoing infarction (p = 0.0088). This was interpreted as an effect of preserved collateral blood flow during M2CAO. Accordingly, we observed only limited recruitment of penumbra regions to the infarction core. However, a gradual increase in infarction size was still occurring as late as 10 hours after M2CAO. Our results indicate that patients suffering MCA branch occlusion stand to benefit from interventional therapy for an extended time period after the emergence of ischemic injury. © 2017 Little et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

  • 33. Lundberg, J.
    et al.
    Razuvaev, A.
    Isaksson, B.
    Agustsson, T.
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Holmin, S.
    Liver parenchyma access and lesion marker via the endovascular route2015Inngår i: Journal of Surgical Research, ISSN 0022-4804, E-ISSN 1095-8673, Vol. 195, nr 2, s. 488-494Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Background Neoadjuvant chemotherapeutic regimens for metastatic colorectal cancer are now so effective that they can cause "vanishing" lesions. With new advances such as local ablation, intra-arterial treatments in bolus with pumps or with beads, and isolation of hepatic perfusion, the need for a working channel to the liver may be warranted, ideally reducing the risk of spreading neoplastic cells. Materials and methods The endovascular trans-vessel wall Extroducer device makes it possible to gain direct access to the liver parenchyma. The distal tip is then detached, to act as both a marker and a securing plug in the vessel defect. We used ex vivo and in vivo tests to evaluate the device as a working channel for local administration of substances to the parenchyma and as a marker for detection with both transabdominal and intraoperative ultrasonography. Results We could deploy the Extroducer device without any hemorrhagic or thromboembolic complications in vivo, and we were able to detect all markers ex vivo and in vivo using both transabdominal and intraoperative ultrasonography. Furthermore, we found that it is possible to administer substances to the liver parenchyma using the catheter. Conclusions The trans-vessel wall technique can be used to establish a working channel to the liver parenchyma for administration of any substance, such as chemotherapeutic agents or cells. The detached device can also be used as a marker for ultrasound-guided partial liver resection in "vanishing lesions." The technique should have a low risk of seeding of neoplastic cells. This study in large animals forms a strong basis for translation to clinical studies.

  • 34. Lundberg, J.
    et al.
    Stone-Elander, S.
    Zhang, X. -M
    Korsgren, O.
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Mekanisk metallografi.
    Holmin, S.
    Endovascular Method for Transplantation of Insulin-Producing Cells to the Pancreas Parenchyma in Swine2014Inngår i: American Journal of Transplantation, ISSN 1600-6135, E-ISSN 1600-6143, Vol. 14, nr 3, s. 694-700Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Insulin-producing cells are transplanted by portal vein injection as an alternative to pancreas transplantation in both clinical and preclinical trials. Two of the main limitations of portal vein transplantation are the prompt activation of the innate immunity and concomitant loss of islets and a small but significant risk of portal vein thrombosis. Furthermore, to mimic physiological release, the insulin-producing cells should instead be located in the pancreas. The trans-vessel wall approach is an endovascular method for penetrating the vessel wall from the inside. In essence, a working channel is established to the parenchyma of organs that are difficult to access by percutaneous technique. In this experiment, we accessed the extra-vascular pancreatic parenchyma in swine by microendovascular technique and injected methylene blue, contrast fluids and insulin-producing cells without acute adverse events. Further, we evaluated the procedure itself by a 1-year angiographical follow-up, without adverse events. This study shows that the novel approach utilizing endovascular minimal invasiveness coupled to accurate trans-vessel wall placement of an injection in the pancreatic parenchyma with insulin-producing cells is possible. In clinical practice, the potential benefits compared to portal vein cell transplantation should significantly improve endocrine function of the graft and potentially reduce adverse events. This study presents one-year follow-up safety data on the microendovascular trans-vessel wall technique and shows that the technique can be used to transplant insulin-producing cells to the swine pancreas parenchyma.

  • 35. Lundberg, Johan
    et al.
    Johansson, Carina B.
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Holmin, Staffan
    Access to the brain parenchyma using endovascular techniques and a micro-working channel2017Inngår i: Journal of Neurosurgery, ISSN 0022-3085, E-ISSN 1933-0693, Vol. 126, nr 2, s. 511-517Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    OBJECTIVE Several older studies report a low risk for parenchymal access to the CNS by surgical techniques. In more recent studies, including those with post-puncture CT scans, there are indications that the risk of bleeding might approach 8%. New therapies, such as those that use viral vectors, modified mRNA, or cell transplantation, will probably warrant more parenchymal access to the CNS. Other minimally invasive routes might then be tempting to explore. This study was designed in 2 parts to address the possibility of using the endovascular route. The first aim was to test the ability to create a parenchymal micro-working channel to the CNS in macaque monkeys through the vessel wall. Second, the biocompatibility of a device-associated, detached, distal securing plug that was made of nitinol was investigated in swine for 1 year. METHODS Trans-vessel wall intervention in the middle cerebral artery and associated cerebral parenchyma was performed in 4 rhesus macaque monkeys using a full clinical angiography suite. A contrast agent and methylene blue were injected to test the working channel and then detached at the distal end to act as a securing plug through the vessel wall. One-year follow-ups were also performed using angiography and histological analysis in 10 swine with 24 implants that were distributed in the external carotid artery tree. RESULTS The cerebral interventions were performed without acute bleeding. Both the contrast agent and methylene blue were infused into the brain parenchyma and subarachnoidal space via the endovascular micro-working channel (7 injections in 4 animals). In the 1-year follow-up period, the implant that was left in the external carotid vessel wall in the swine was covered by the endothelium, which was followed by dislodgement just outside the blood vessel with thin capsule formation. No stenosis in the artery was detected on 1-year angiography. The animals showed normal behavior and blood sample results during the follow-up period. This is the first histological demonstration of nitinol biocompatibility when the implant is positioned through an arterial wall and indicates that the trans-vessel wall technique is not comparable with stent placement and its ability to induce intimal hyperplasia and restenosis. CONCLUSIONS This study demonstrates that the trans-vessel wall technique is applicable to brain intervention in macaque monkeys, providing a micro-working channel for delivery or sampling. The long-term follow-up study of the detached device in swine showed no clinical or biochemical complications and a normal angiography appearance.

  • 36. Lundberg, Johan
    et al.
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Mekanisk metallografi.
    Holmin, Staffan
    Long Term Follow-Up of the Endovascular Trans-Vessel Wall Technique for Parenchymal Access in Rabbit with Full Clinical Integration2011Inngår i: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 6, nr 8, s. e23328-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Objective: Endovascular techniques are providing options to surgical/percutaneous cell transplantation methods. Some cells, e. g. insulin producing cells, are not suitable for intra-luminal transplantation and for such cells, other options must be found. We have constructed a "nanocatheter'' with a penetrating tip for vessel perforation, thereby creating a working channel for parenchymal access by endovascular technique. To finish the procedure safely, the distal tip is detached to provide a securing plug in the vessel wall defect. Materials and Methods: We have performed interventions with full clinical integration in the superior mesenteric artery (SMA), the subclavian artery and the external carotid artery in rabbits. No hemorrhagic-or thromboembolic events occurred during the procedure. Stenosis formation and distal embolisation were analyzed by angiography and macroscopic inspection during autopsy at five, 30 and 80 days. All animals and implanted devices were also evaluated by micro-dissections and histochemical analysis. Results: In this study we show safety data on the trans-vessel wall technique by behavioral, angiographical and histological analysis. No stenosis formation was observed at any of the follow-up time points. No animals or organs have shown any signs of distress due to the intervention. Histological examination showed no signs of hemorrhage, excellent biocompatibility with no inflammation and a very limited fibrous capsule formation around the device, comparable to titanium implants. Further, no histological changes were detected in the endothelia of the vessels subject to intervention. Conclusions: The trans-vessel wall technique can be applied for e. g. cell transplantations, local substance administration and tissue sampling with low risk for complications during the procedure and low risk for hemorrhage, stenosis development or adverse tissue reactions with an 80 days follow-up time. The benefit should be greatest in organs that are difficult or risky to reach with surgical techniques, such as the pancreas, the CNS and the heart.

  • 37. Lundberg, Johan
    et al.
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Mekanisk metallografi.
    Holmin, Staffan
    New Endovascular Method for Transvascular Exit of Arteries and Veins: Developed in Simulator, in Rat and in Rabbit with Full Clinical Integration2010Inngår i: PLOS ONE, ISSN 1932-6203, Vol. 5, nr 5, s. e10449-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Background: Endovascular technique has benefits vis-a-vis surgical access to organs with less accessible anatomical locations. To minimize surgical risk we propose a novel endovascular technique, to create parenchymal access through endovascular methods. Methodology/Principal Findings: We have developed, manufactured and tested an endovascular catheter with a depth limiting collar and a penetrating tip that is used to perforate vessels, thereby creating a working channel to the extravascular space. Computer simulations and subsequent interventions have been performed ex vivo and in vivo in both small and large animals by testing different prototypes. All tests were designed for testing extravascular hemostasis and absence of thrombo-embolic complications when exiting the vessels from the inside to the extra vascular space. We have deposited prototypes after intervention in vascular walls over a period of 14 days in rat with no impairment on blood flow and no signs of thrombo-embolic complications upon re-exploration (n = 7). We have also incorporated the catheter system with clinically available systems both in an ex vivo simulator setting and in a full scale clinical angiographical setting in rabbit were no bleeding (0%) in any of the interventions performed (n = 40). To prevent hemorrhage during termination of the procedure, a hollow electrolysis detachment-zone leaves the distal tip in the vessel-wall after the intervention. This has also been tested with absolute hemostasis in large animals (n = 6). Conclusions/Significance: We have developed and tested a new system for transvascular tissue access in simulations, ex vivo and in vivo in small and large animals, integrating it with standard clinical catheters and angiographical environment, with absolute hemostasis and without thromboembolic complications. In a clinical setting for stem cell transplantation, local substance administration or tissue sampling, the benefit should be greatest in organs that are difficult or high-risk to access with other techniques, such as the pancreas, the central nervous system (CNS) and the heart.

  • 38.
    Muwanguzi, Abraham Judah Bumalirivu
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Aune, Ragnhild E.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Materialens processvetenskap.
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Byaruhanga, J.
    State of the Art on the Exploration of Ugandaá Iron Ore for the Manufacture of Iron and Steel in Uganda2009Rapport (Annet vitenskapelig)
  • 39.
    Muwanguzi, Abraham Judah Bumalirivu
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Aune, Ragnhild E.
    Department of Materials Science and Engineering, Norwegian University of Science Technology, Trondheim, Norway.
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Byaruhanga, Joseph K.
    Department of Mechanical Engineering, Makerere University, Kampala, Uganda.
    State of the art paper on the exploitation of Uganda's iron ore for the manufacture of iron and steel in UgandaManuskript (preprint) (Annet vitenskapelig)
    Abstract [en]

     

    Development of a nation is catalyzed and set on a firm foundation and path if the natural resources within the country are optimally exploited. The citizens are empowered economically, regions in the nation grow in terms of infrastructure and service provision and a lot of foreign exchange is saved; as this would have been spent in importation of raw materials. Currently, Uganda imports about 85% of the iron and steel products used in its industrial sectors. The country is endowed with iron ore deposits in the east and southwestern part, Figure 1. Each of these deposits is estimated to have about 50 million tonnes of ore reserve, with a rich grade of iron, and the lay unexploited. This paper reviews the current and traditional means of extracting and refining iron ores. The occurrences of iron ores, qualities and characterization methods have been reviewed. The mechanical, thermo-physical and thermodynamic properties plus the metallurgical extraction of the ore are also included. The aim is to understand the properties of iron and the behaviour of these when subject to various conditions, plus the technology involved in the exploitation of iron ores for iron and steel production. This will be used as a basis for the production of iron and steel raw materials for Ugandan industries, by exploiting the locally available iron ores in Uganda.

     

  • 40.
    Nordén, Karin
    et al.
    Högskolan i Dalarna.
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Experimental and numerical study of inner deformation during shape rolling of an M2 high speed steelArtikkel i tidsskrift (Annet vitenskapelig)
  • 41.
    Nordén, Kristina
    et al.
    Högskolan Dalarna.
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Mekanisk metallografi.
    A study of surface deformation during wire-rod rolling of high speed steels using experimental and computational techniques2007Inngår i: Steel Research International, ISSN 1611-3683, Vol. 78, nr 12, s. 876-883Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The evolution of surface defects during shape rolling of high-speed steel billets is studied using longitudinal surface defects prepared by machining and welding. The reduction of the defects during rolling in a production mill is compared to the total area reduction of the billets. Samples are collected after pass 4, 6, 8, 14, 19 and the final pass, 28, representing the finished 5.5mm wire. By inspecting the cross sections, the rotation of the billets from pass to pass is evaluated. Results from FE simulations on solid billets are compared to the experimental results. Generally, simulations predict less reduction than observed experimentally. In most cases cracks reduce most effectively followed by carbon steel welds and stainless steel welds.

  • 42.
    Olofsson, Anders
    et al.
    KTH, Skolan för industriell teknik och management (ITM).
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Mekanisk metallografi.
    Hardening Distortions of Serial Produced Crown Wheels2017Inngår i: Materialwissenschaft und Werkstofftechnik, ISSN 0933-5137, E-ISSN 1521-4052Artikkel i tidsskrift (Annet vitenskapelig)
    Abstract [en]

    The hardening distortions of serial produced crown wheels are studied with respect to gear runout, inner diameter and back-face tilt. The data analysed originates from a production data base from ordinary production as well as from directed experiments carried out in production, resulting in a large set of data. Strong influences are found for steel plants, position of material in ingots and stacking levels on hardening trays. It could be concluded that rectangular strands have a detrimental effect on gear runout, which, however, can be strongly decreased by disabling the magnetic stirring during casting. Furthermore, the inner diameter after quenching is influenced by the stacking level on the hardening tray when free-hardening or when using a segmented central expander during press quenching. This influence is attributed to variations in hardening temperature. When press quenching using a fixed mandrel, the effect of stacking level disappears. Moreover, it is found that the back-face tilt strongly depends on the position in the ingot as well as on the stacking level on the hardening tray.

  • 43.
    Olofsson, Anders
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Mekanisk metallografi. Scania CV, Södertälje, Sweden.
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Mekanisk metallografi. Scania CV, Södertälje, Sweden.
    Brash, Benjamin
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Mekanisk metallografi. Scania CV, Södertälje, Sweden.
    Hardening distortions related to segregations in crown wheels2016Inngår i: HTM - Journal of Heat Treatment and Materials, ISSN 1867-2493, Vol. 71, nr 2, s. 68-74Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The back-face tilt of press-hardened crown wheels is investigated for continuous and ingot cast material. Two different geometries are studied, one with a flat back-face and one with a step. For two ingots, the original material position is tracked and coupled to back-face tilt, cross section hardness and chemical segregation. The chemical gradients are shifted from top to bottom of the ingot and are strongly coupled to the back-face tilt.

  • 44.
    Olofsson, Anders
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Köhn, Mikael
    Scania CV AB.
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Identifying process parameters influencing gear runoutManuskript (preprint) (Annet vitenskapelig)
    Abstract [en]

    The hardening distortions with respect to base body, clutch teeth and helical gears are investigated for a serial-produced main shaft gear of a 20NiCrMoS6-4 steel. The influences of casting geometry, annealing heat treatment and stress relief annealing of blanks, as well as vertical and horizontal loading arrangements during case hardening, are studied. The concentricity, roundness and runout of clutch teeth and helical gears are measured in the soft machined, hardened and hard-machined conditions.

    The Brinell hardness is measured on blanks obtained from different manufacturing routes showing differences in hardness and scatter. Stress relief annealing lowers the hardness and the scatter for all groups, but has no significant effect on distortions. The case depth, core hardness and surface hardness are measured after hardening. The study shows that the surface hardness correlates with the oil flow measured in the quench tank.

    The effect of casting geometry is stronger for the clutch teeth compared to the helical gears. For the clutch-teeth roundness and runout, significantly lower values are found for square geometry compared to rectangular. It is also seen that the major part of the runout comes from roundness errors which are mainly induced by the hardening. Horizontal loading reduces roundness errors and runout but produces conical base-bodies with worse backplane flatness.

  • 45. Olupot, P. W.
    et al.
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Mekanisk metallografi.
    Byaruhanga, J. K.
    Development of electrical porcelain insulators from ceramic minerals in Uganda2014Inngår i: Ceramic Engineering and Science Proceedings, 2014, nr 2, s. 115-125Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Characterisation studies on ceramic minerals in Uganda have revealed their possibility for application in ceramic insulator production. Sand, feldspar and clay were used to formulate porcelain bodies based on established theories for ensuring high dielectric and mechanical strength. Sintering profiles and their effects on strength, crystalline phase content and morphology were investigated using dilatometiy, 4-point bending strength, XRD and FEG-SEM. Optimum properties of insulators from these minerals were attained with heating/cooling rates of 6°C/min to peak temperature of 1250°C with dwell time of 2h. The quartz content of the sintered body decreased as peak temperature was increased beyond 1250°C along with a decline in strength of the bodies. Neither increasing dwell time at 1250°C nor reducing the heating/cooling rate to less than 6°C/min for a peak temperature of 1250°C were shown to result in improvement of strength. The morphology of mullite crystals did not change with change in either heating/cooling rate or dwell time at peak temperature of 1250°C. The industrial sized specimens produced exhibited dry and wet flashover voltages of 22.8kV and 11.4kV respectively, transverse load capacity of 12.5kN and bulk density of 2.27g/cm3. These are satisfactory for low voltage insulation applications.

  • 46. Olupot, P. W.
    et al.
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Byaruhanga, J. K.
    Proprietà di porcellane elettriche ottenute con materie prime ugandesi: Studio degli effetti dovuti alla formaulazione dell'impasto e alla temperatura di sinterizzaione2008Inngår i: Ceramurgia, ISSN 0045-6152, Vol. 38, nr 1, s. 17-25Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Five sample mixtures of Ugandan kaolin, ball clay, feldspar and flint were formulated and porcelain samples fabricated by extrusion through a vacuum pugmill. Samples were evaluated for formability. The degree of densificaron of sintered specimens fired at 1200 to 1350°C was evaluated by measuring the firing shrinkage, bulk density, water absorption and bending strength. Crystalline phases and mullite morphology were studied using XRD and SEM respectively. Dielectric strength measurements were carried out on disc specimens. Dielectric and bending strength properties deteriorated at high temperatures because of pore formation and decreasing amount of undissolved quartz in the crystalline phase. An optimum composition of 30% kaolin, 15% ball clay, 30% feldspar and 25% quartz yielded an unglazed body with highest bending strength of 72MPa and dielectric strength of 19MVm-1 after firing at 1250°C. The body consisted of small, closely packed mullite needles and undissolved quartz crystals embedded in a glass matrix.

  • 47.
    Olupot, Peter W.
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap.
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Mekanisk metallografi.
    Byaruhanga, J. K.
    Effects of mixing proportions and firing temperature on properties of electric porcelain from Ugandan minerals2008Inngår i: Industrial ceramics, ISSN 1121-7588, Vol. 28, nr 1, s. 1-10Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Five sample mixtures of Ugandan kaolin, ball clay, feldspar and flint were formulated and porcelain samples fabricated by extrusion through a vacuum pugmill. Samples were evaluated for formability. The degree of densification of sintered specimens fired at 1200 to 1350 degrees C was evaluated by measuring the firing shrinkage, bulk density, water absorption and bending strength. Crystalline phases and mullite morphology were studied using XRD and SEM respectively. Dielectric strength measurements were carried out on disc specimens. Dielectric and bending strength properties deteriorated at high temperatures because of pore formation and decreasing amount of undissolved quartz in the crystalline phase. An optimum composition of 30% kaolin, 15% ball clay, 30% feldspar and 25% quartz yielded an unglazed body with highest bending strength of 72MPa and dielectric strength of 19MVm(-1) after firing at 1250 degrees C. The body consisted of small, closely packed mullite needles and undissolved quartz crystals embedded in a glass matrix.

  • 48.
    Olupot, Peter Wilberforce
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Mekanisk metallografi.
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Mekanisk metallografi.
    Byaruhanga, Joseph K.
    Characterization of feldspar and quartz raw materials in Uganda for manufacture of electrical porcelains2006Inngår i: Journal of the Australasian Ceramic Society, ISSN 1018-6689, Vol. 42, nr 1, s. 29-35Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Electric porcelains are widely used for insulation purposes. The aim of this study is to characterize feldspar and quartz raw materials in Uganda for use in manufacture of electric porcelains. Samples from two deposits of each feldspar and silica are investigated to assess their potential as raw materials in the manufacture of electric porcelains. Raw samples ground to powder form are investigated by means of X-ray diffraction, thermal analysis, and scanning electron microscopy. In addition, the chemical composition, particle size distribution and density of the powders are determined. The study reveals one of the feldspar deposits to consist of purely ordered microcline, while the other has ordered microcline, quartz and albite. The silica deposits are purely of quartz mineral. The materials investigated, are suitable for use in porcelain production.

  • 49.
    Olupot, Peter Wilberforce
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Mekanisk metallografi.
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Mekanisk metallografi.
    Byaruhanga, Joseph K.
    Development and characterisation of triaxial electrical porcelains from Ugandan ceramic minerals2010Inngår i: Ceramics International, ISSN 0272-8842, E-ISSN 1873-3956, Vol. 36, nr 4, s. 1455-1461Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Ten formulations of triaxial porcelain composed from 30-60% clay, 20-45% feldspar and 20-25% sand, were prepared from raw materials sourced from Ugandan deposits. Specimens were made using the plastic extrusion method and characterized in terms of constituent oxide composition, flexural strength, fracture toughness, dielectric strength, microstructure and phase properties using ICP-AES analyses, 4-point load strength test, Vicker's indentation, FEG-SEM and powder-XRD analyses, respectively. XRD studies revealed that the crystalline phases are mullite and quartz and their intensity is almost identical for all samples fired at 1250 degrees C but there is a decrease in quartz content as temperature is increased. Samples with 20% sand content resulted in higher density, modulus of rupture and fracture toughness compared to those containing 25% sand. The major factor influencing bending strength was found lobe porosity in samples as opposed to crystallinity. A sample with 67.3% SiO2, 20.2% Al2O3, 3.4% K2O and 6.3% others exhibited best properties. (C) 2010 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

  • 50.
    Olupot, Peter Wilberforce
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Mekanisk metallografi.
    Jonsson, Stefan
    KTH, Skolan för industriell teknik och management (ITM), Materialvetenskap, Mekanisk metallografi.
    Byaruhanga, Joseph K.
    State of the art paper on development of electric porcelain insulators from Ugandan raw materialsManuskript (preprint) (Annet vitenskapelig)
12 1 - 50 of 70
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