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  • 11
    Electronic Resource
    Electronic Resource
    Haemodynamic Evaluation of Cerebral Gliomas Using XeCT (1998)
    Springer
    Acta neurochirurgica 140 (1998), S. 223-234 
    Details
    ISSN: 0942-0940
    Keywords: Keywords: Cerebral blood flow; XeCT; low grade glioma; high grade glioma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The purpose of this study was to characterize regional blood flow (BF) in untreated cerebral gliomas (CG) using stable Xe-enhanced computed tomography (XeCT). XeCT of 38 patients with untreated CG were analyzed and compared with CT and magnetic resonance images (MRI) and histopathological findings. Individual averaged BF values for tumour in 29 high grade gliomas (HGGs) and 9 low grade gliomas (LGGs) were intermediate between averaged BF values for cortex and white matter in the non-tumour bearing hemisphere. All averaged BF values for cyst and central necrosis were very low. In 27 HGGs, BF in tumour was relatively high in ring-enhancement lesions on CT and MRI, but was low even in viable tumour centers showing no contrast enhancement. In the other 2 HGGs, BF was low in tumour center and relatively high in tumour periphery regardless of homogeneous enhancement. In 5 HGGs, averaged BF value of the cortex outside surrounding oedema was higher than that of cortex in the non-tumour bearing hemisphere. In LGGs, BF distribution in tumour was homogeneously low in 3 small-sized and heterogeneous in 6 large-sized lesions including moderately high and low BF regions. These differences in BF pattern between HGGs and LGGs on XeCT might be helpful in considering to some extent the histopathology of untreated cerebral glioma pre-operatively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s007010050089
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  • 12
    Electronic Resource
    Electronic Resource
    Frequent TIA in the territory fed by the anastomosed STA after combined therapeutic ICA occlusion and extracranial-intracranial bypass: Case report (1995)
    Springer
    Acta neurochirurgica 133 (1995), S. 206-210 
    Details
    ISSN: 0942-0940
    Keywords: Giant cerebral aneurysm ; carotid artery occlusion ; extracranial-intracranial bypass ; cerebral embolism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Frequent transient ischaemic attacks (TIAs) in the territory fed by the anastomosed superficial temporal artery (STA) after combined therapeutic internal carotid artery (ICA) occlusion and extra-cranial-intracranial bypass is described in a 52-year-old woman with a giant aneurysm in the supraclinoid portion of the left ICA showing impairment of visual acuity in the left eye and right upper quadrantanopia. After the balloon test occlusion of the left ICA which was tolerated, the left STA-middle cerebral artery anastomosis was performed and occlusion of the left ICA using detachable balloons was carried out a day later. TIAs corresponding to the territory fed by the anastomosed STA occurred nine times two to four days and five times eight to nine days after the ICA occlusion without new infarction on computed tomography (CT) scan. Single-photon emission computed tomography showed no hypoperfusion immediately after the initial TIA. CT scan revealed thrombosis of half of the aneurysm a day after the ICA occlusion. The patient developed the same TIA as previously by compression of the left anastomosed STA at the time of follow-up angiography which was carried out eight days after the occlusion. Although heparin was continuously administered after the ICA occlusion for two days, the initial TIA occurred during heparinization. Anticoagulation seemed to be inadequate judging from activated coagulation time and incomplete thrombosis of the aneurysm occurred during heparinization. It is likely that the TIAs are caused by embolism via the STA, which is a rare ischaemic complication.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01420076
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  • 13
    Electronic Resource
    Electronic Resource
    Cerebral haemodynamic changes after endovascular treatment of arteriovenous malformations: Evaluation by single-photon emission CT (1994)
    Springer
    Acta neurochirurgica 127 (1994), S. 142-150 
    Details
    ISSN: 0942-0940
    Keywords: Arteriovenous malformation ; endovascular treatment ; cerebral haemodynamic changes ; single-photon emission CT
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Cerebral haemodynamic changes in 17 patients with cerebral arteriovenous malformations (AVMs), who showed hypoperfusion on single-photon emission computed tomography (SPECT) before endovascular treatment, were studied after embolization. Nine of them had non-haemorrhagic clinical manifestations and the other eight had a history of intracranial haemorrhage. Obliteration of AVMs was nearly total in six patients and partial in eleven. New low density lesions on X-ray computed tomography (CT) developed in 3 of 6 patients after nearly total obliteration and one of 11 patients after partial obliteration. The first SPECT after embolization showed diminished hypoperfusion in 11 of 13 patients without new low density lesions and one of 4 patients with new low density lesions. Diminution of hypoperfusion was seen even in two patients who underwent SPECT study immediately after the embolization. Cerebral circulation was improved in five of eight patients with low density lesions before embolization and in nine of eleven patients after partial obliteration. Hypoperfused state in the haemorrhagic group tended to remain unchanged compared with that in the non-haemorrhagic group. The hypoperfused area was expanded after embolization in three patients with new cerebral infarction. It is important for improvement of cerebral circulation to reduce the shunt flow without causing new infarction due to the embolization itself. In one of two patients who had a hyperperfused area surrounding the AVM after embolization, an unexpected and abnormal degree of brain swelling and haemorrhage occurred at the end of the surgery 20 days after the embolization. In the other patient, total extirpation was successfully performed after confirming disappearance of hyperperfusion in the follow-up SPECT. SPECT allows repeated measurement of the cerebral blood flow pattern easily and safely, and is useful for AVM management.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01808757
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  • 14
    Electronic Resource
    Electronic Resource
    Electrical Properties of Single Phase Al-Based Quasicrystals (1987)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 22-24 (Jan. 1987), p. 471-482 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/02/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.22-24.471.pdf
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  • 15
    Electronic Resource
    Electronic Resource
    Production of Al-Based Ternary and Quaternary Icosahedral Phases (1987)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 22-24 (Jan. 1987), p. 539-554 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/02/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.22-24.539.pdf
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  • 16
    Electronic Resource
    Electronic Resource
    Positron Annihilation Studies of Icosahedral AlCuRu and AlCuFe Alloys (1997)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 255-257 (Sept. 1997), p. 451-453 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/02/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.255-257.451.pdf
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  • 17
    Electronic Resource
    Electronic Resource
    Search for High Damping Metallic Glasses (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 319 (Sept. 2006), p. 151-156 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In a hydrogen-doped metallic glass, there appear low-temperature and high-temperatureinternal friction peaks respectively associated with a point-defect relaxation and the crystallization.The high-temperature-side slope of low-temperature peak and also the low-temperature-side slopeof high-temperature peak enhance the background internal friction near the room temperature. Ahydrogen-doped Mg-base metallic glass was proposed as a high-damping material to be used nearand somewhat above the room temperature. Stability of the high damping was also checked
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.319.151.pdf
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  • 18
    Electronic Resource
    Electronic Resource
    Internal Friction of Hydrogenated Ti (Ni,Cu) Shape Memory Alloys (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 319 (Sept. 2006), p. 39-44 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Effects of hydrogen doping on the internal friction (IF) of ternary Ti50Ni50-xCux (x=15, 20,25)[removed info] shape memory alloys, prepared by rolling and annealing laminating Ti and Ni-Cu alloy sheets,have been measured with a damping mechanical analyzer in a forced bending oscillation mode attemperatures from 173K to 423K at three frequencies, 0.1, 1 and 5Hz. The effects of hydrogendoping on IF are common to the three alloys: a hydrogen IF peak appears at around 260K; the IFpeak value (tanφ) increases rapidly with increasing hydrogen concentration up to tanφ=0.03 at0.5at% and then decreases; the peak temperature also increases rapidly and then gradually decreases.From the frequency dependence of the peak temperature, the activation energy E and thepre-exponential factor ω0 have been analyzed to be E=0.6-0.7eV and ω0=1013-14s-1. The origin of thehydrogen IF is interpreted to be the Snoek-Koester effect due to interaction of twin boundarydislocations and segregated hydrogen atoms. Effects of hydrogen on mechanical properties of thealloys have also been studied
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.319.39.pdf
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  • 19
    Electronic Resource
    Electronic Resource
    Electrical and optical properties of CuIn5S8 single crystals (1983)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 1875-1879 
    Details
    ISSN: 0392-6737
    Keywords: Conductivity phenomena in semiconductors and insulators
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Molte proprietà ottiche e di trasporto sono state studiate sui cristalli singoli di tipon di CuIn5S8. Si è determinato che il gap di energia a 0 K dalle misurazioni elettriche è 1.4 eV. Si è trovata un'anisotropia dell'effetto di magnetoresistenza e si è suggerito che i minimi della banda di conduzione siano situati in punti lungo le direzioni [100] nello spaziok. Si è trovata una banda di assorbimento ottico in una regione dell'infrarosso di (1÷1.6) μm, che è state attribuita alle transizioni delle piú basse bande di conduzione situate lungo le direzioni [100] a una piú alta banda di conduzione.
    Abstract: Резюме Исследуются некоторые транспортные и оптические свойства монокристаллов CuIn5S8 n-типа. Из электрических измерений определяется энергетическая щель при 0 К, которая составляет 1.4 эВ. Обнаружена анизотропия магниторезистивного эффекта. Предполагается, что минимумы зоны проводимости расположены в точках вдоль направления [100] вk-пространстве. Обнаружена оптическая зона поглощения в инфракрасной области (1÷1.6) мкм, которая связана с переходами из нижней зоны проводимости, расположенной вдоль направлений [100], В верхнюю зону проводимости.
    Notes: Summary Several transport and optical properties have been studied onn-type CuIn5S8 single crystals. The energy gap at 0 K was determined from the electrical measurements to be 1.4 eV. An anisotropy of the magnetoresistance effect was found and it was suggested that the minima of the conduction band were located at points along the [100] directions ink-space. An optical-absorption band was found in an infrared region of (1÷1.6) μm and was attributed to the transitions from the lowest conduction band situated along the [100] directions to an upper conduction band.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02457879
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  • 20
    Electronic Resource
    Electronic Resource
    A direct evidence for defect in glucose-6-phosphate transport system in hepatic microsomal membrane of glycogen storage disease type Ib
    Amsterdam : Elsevier
    Biochemical and Biophysical Research Communications 119 (1984), S. 593-597 
    Details
    ISSN: 0006-291X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0006-291X(84)80290-9
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