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Sökning: WFRF:(Forsberg A) > Luleå tekniska universitet

  • Resultat 1-7 av 7
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1.
  • Åström, E., et al. (författare)
  • Precision measurements of linear scattering density using muon tomography
  • 2016
  • Ingår i: Journal of Instrumentation. - : Institute of Physics Publishing. - 1748-0221 .- 1748-0221. ; 11:7
  • Tidskriftsartikel (refereegranskat)abstract
    • We demonstrate that muon tomography can be used to precisely measure the properties of various materials. The materials which have been considered have been extracted from an experimental blast furnace, including carbon (coke) and iron oxides, for which measurements of the linear scattering density relative to the mass density have been performed with an absolute precision of 10%. We report the procedures that are used in order to obtain such precision, and a discussion is presented to address the expected performance of the technique when applied to heavier materials. The results we obtain do not depend on the specific type of material considered and therefore they can be extended to any application.
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2.
  • A., Trubetskaya, et al. (författare)
  • The Effect of Wood Composition and Supercritical CO2 Extraction on the Charcoal Production
  • 2019
  • Ingår i: 2019 AIChE Annual Meeting proceedings. - : American Institute of Chemical Engineers.
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • This work demonstrated that the coupling of supercritical carbon dioxide extraction with slow pyrolysis is effective to remove over half of extractives from low quality wood and to generate biochar from remaining solid wood fractions. The high yields of extractives from supercritical carbon dioxide extraction illustrates the potential utilizing of low quality wood as an alternative feedstock for the sustainable production of value-added chemicals. Results showed that supercritical carbon dioxide extraction has neither a strong impact on the physical properties of original wood nor on the yield of solid biochar. These results are promising as they show that the biochar obtained for this renewable feedstock could be used as an alternative to fossil-based coke in applications including ferroalloy industries. Moreover, the heat treatment temperature and supercritical carbon dioxide extraction had a significant impact on the tar yields, leading to the increase in naphthalene, polycyclic aromatic hydrocarbons, aromatic and phenolic fractions with the greater temperature. The differences in gasification reactivity and dielectric properties of solid biochars, composition and yields of liquid products of non-treated pinewood and extracted wood fraction emphasize the impact of supercritical carbon dioxide extraction on the pyrolysis process. 
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3.
  • Andersson, Staffan, et al. (författare)
  • 24-hour electrocardiographic study in myotonic dystrophy
  • 1988
  • Ingår i: Cardiology. - : S. Karger AG. - 0008-6312 .- 1421-9751. ; 75:4, s. 241-249
  • Tidskriftsartikel (refereegranskat)abstract
    • Thirty-eight consecutive adult patients with myotonic dystrophy were included in a study with electrocardiography at rest and 24-hour ambulatory electrocardiography. The patients were subdivided into three groups according to the severity of the disease. The prevalence of abnormal electrocardiograms at rest was 31, 50 and 100% in patients with mild, moderate and severe disease, respectively. The main characteristics observed at ambulatory electrocardiography were a high frequency of sinus bradycardia (58%) and intermittent atrioventricular block II (8%). These bradyarrhythmias were not correlated to the severity of the disease. Sustained atrial fibrillation or flutter was found in 3 patients (8%), all with the most severe form of the disease. Ambulatory electrocardiography should be used deliberately in the evaluation of patients with myotonic dystrophy and symptoms compatible with cardiac arrhythmias.
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4.
  • Andersson, Staffan, et al. (författare)
  • Assessment of autonomic nerve function in myotonic dystrophy
  • 1990
  • Ingår i: Journal of the Autonomic Nervous System. - : Elsevier BV. - 0165-1838 .- 1872-7476. ; 29:3, s. 187-192
  • Tidskriftsartikel (refereegranskat)abstract
    • The function of the autonomic nervous system was studied in 23 patients with myotonic dystrophy, from a defined population in northern Sweden with an extremely high prevalence of this disease. Heart rate variability tests showed only minor signs of parasympathetic dysfunction. Blood pressure and plasma noradrenaline measurements in recumbent and upright positions showed no signs of sympathetic neuropathy. Increased plasma levels of noradrenaline was an unexpected finding. Our study does not support the hypothesis that cardiac arrhythmias, orthostatic hypotension, gastrointestinal motility disturbances and urinary bladder dysfunction in myotonic dystrophy are caused by autonomic neuropathy, and we believe that these symptoms should rather be ascribed to a defective function of the target organs
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5.
  • Andersson, Staffan, et al. (författare)
  • Echocardiographic features of myotonic dystrophy
  • 1989
  • Ingår i: American Journal of Noninvasive Cardiology. - : S. Karger AG. - 0258-4425 .- 2504-2378. ; 3:6, s. 354-358
  • Tidskriftsartikel (refereegranskat)abstract
    • Thirty adult patients with myotonic dystrophy from a defined population in northern Sweden were examined by echocardiograms were found in 1 of 7 (14%) patients with mild disease, 7 of 13 (54%) patients with moderate disease, and 6 of 10 (60%) patients with severe disease
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7.
  • Bjerle, P, et al. (författare)
  • Electrocardiographic findings in myotonic dystrophy
  • 1988
  • Ingår i: British Heart Journal. - : BMJ. - 0007-0769. ; 59:1, s. 47-52
  • Tidskriftsartikel (refereegranskat)abstract
    • Sixty five patients with myotonic dystrophy, from a defined population in northern Sweden with an extremely high prevalence of this disease, were examined by electrocardiography. The patients were subdivided into three groups according to the severity of the disease. Abnormal electrocardiograms were found in 6 (35%) patients with mild disease, 12 (50%) patients with moderate disease, and 23 (96%) patients with severe disease. First degree atrioventricular block and left anterior hemiblock were the most commonly encountered abnormalities in patients with mild and moderate disease, whereas atrial fibrillation and flutter, abnormal Q waves, and repolarisation abnormalities were more common in patients with severe disease. This study shows that the heart is often affected by myotonic dystrophy. These effects can be detected by electrocardiography in early and mild forms of the disease. The effect on the heart is progressive and clinically important atrial arrhythmias and electrocardiographic abnormalities which are useful in differential diagnosis are common in severe forms of the disease.
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  • Resultat 1-7 av 7

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