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  • Artikel: DFG Deutsche Nationallizenzen  (8)
  • viscosity  (6)
  • Anterior choroidal artery  (2)
  • 1
    Digitale Medien
    Digitale Medien
    Retrograde filling of the anterior choroidal artery: vertebral angiographic sign of obstruction in the carotid system (1992)
    Springer
    Neuroradiology 34 (1992), S. 504-507 
    Details
    ISSN: 1432-1920
    Schlagwort(e): Cerebral angiography ; Collateral circulation ; Anterior choroidal artery
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Retrograde filling of seven anterior choroidal arteries from the posterior circulation was observed on a vertebral angiogram in six patients with occlusion of the proximal anterior choroidal artery or of the internal carotid artery. In one patient with thrombotic occlusion of the internal carotid artery, the enlarged anterior choroidal artery functioned as a major collateral pathway from the posterior circulation to the territory of the middle cerebral artery. Retrograde filling of the anterior choroidal artery is a sign of obstruction changes in the ipsilateral carotid artery at or proximal to the origin of the anterior choroidal artery.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00598961
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    The anterior choroidal artery syndrome (1994)
    Springer
    Neuroradiology 36 (1994), S. 337-339 
    Details
    ISSN: 1432-1920
    Schlagwort(e): Microangiography ; Anterior choroidal artery
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract The distribution of the anterior choroidal artery (AChA) was analysed on coronal, sagittal and axial microangiograms of cadaver brains. On axial sections, the territory of the AChA was confirned to an arcuate zone between the striatum anterolaterally and the thalamus posteromedially. On sagittal sections, fine vessels from the cisternal part of the AChA were seen to extend upwards and somewhat posteriorly into the region of the posterior limb of the internal capsule. On coronal sections, ascending branches of the AChA coursed latcrally and then upwards to penetrate the globus pallidus and the inferior portion of the posterior limb of the internal capsule, apparently terminating at the lateral border of the thalamus. Determining the distribution of this artery on multiplanar sections was helpful for interpreting pathological changes, including infarcts, occurring in this region on multiplanar CT and/or MR images.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00612113
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  • 3
    Digitale Medien
    Digitale Medien
    Viscosity of saturated liquid fluorocarbon refrigerants from 273 to 353 K (1991)
    Springer
    International journal of thermophysics 12 (1991), S. 105-117 
    Details
    ISSN: 1572-9567
    Schlagwort(e): capillary viscometer ; fluorocarbons ; refrigerants ; viscosity
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Viscosity measurements were carried out on saturated liquid fluorocarbon refrigerants using an improved capillary viscometer for 11 kinds of fluorocarbon refrigerants; CCl3F (R11), CCl2F2 (R12), CHClF2 (R22), CBrF3 (R13B1), CH3CHF2 (R152a), CCl2FCClF2 (R113), CHCl2CF3 (R123), CHClFCClF2 (R123a), CH3CF3 (R143a), CClF2CCl2F2 (R114), and CH2FCF3 (R134a), in the temperature range from 273 to 353 K. An equation is given to represent the viscosity as a function of temperature.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00506125
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  • 4
    Digitale Medien
    Digitale Medien
    Liquid viscosities and densities of HFC-134a+glycol mixtures (1993)
    Springer
    International journal of thermophysics 14 (1993), S. 45-53 
    Details
    ISSN: 1572-9567
    Schlagwort(e): density ; diethylene glycol ; ethylene glycol ; HFC-134a ; polyethylene glycol ; polypropylene glycol ; tetraethylene glycol ; triethylene glycol ; viscosity
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Liquid viscosity and density of six binary mixtures of HFC-134a with glycols [ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol (400), and polypropylene glycol (2000)] have been measured in the temperature range from 273 to 333 K. The viscosity was measured by a rolling-ball viscometer calibrated with standard liquids of viscosities and densities (JS5, JS10, JS20, and JS50). The density was measured with a glass pycnometer. The uncertainties of the measurements were estimated to be less than 3.4 % for viscosity and 0.04 % for density, respectively. An equation is given to represent the obtained viscosity values as a function of weight fraction and temperature.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00522660
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  • 5
    Digitale Medien
    Digitale Medien
    Viscosity of nitrous oxide in the critical region (1994)
    Springer
    International journal of thermophysics 15 (1994), S. 603-626 
    Details
    ISSN: 1572-9567
    Schlagwort(e): critical anomaly ; mode-coupling theory ; nitrous oxide ; viscosity
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The gaseous viscosity of nitrous oxide (N2O) was measured in the critical region. The experimental temperature range was between 309.650 and 318.150 K and the pressure range was up to 9.6 MPa. The measurements were obtained with an oscillating-disk viscometer, combined with local determination of the density at the position of the oscillating disk, and they have an estimated accuracy of 0.6 % for viscosity and 0.5 % for gas density. The viscosity of N2O exhibits an anomalous increase near the critical point. The anomalous increase in viscosity was analyzed with the viscosity equation proposed by Basu and Sengers.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01563790
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  • 6
    Digitale Medien
    Digitale Medien
    Viscosity and density of liquid mixtures ofn-alkanes with squalane (1995)
    Springer
    International journal of thermophysics 16 (1995), S. 773-779 
    Details
    ISSN: 1572-9567
    Schlagwort(e): capillary viscometer ; density ; n-butane ; n-hexane ; squalane ; viscosity
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Viscosity and density measurements are reported for binary liquid mixtures ofn-butane andn-hexane with squalane in the temperature range from 273 to 333 K. The viscosity measurements have been carried out by using a capillary viscometer calibrated with standard liquids. that is. JS5, JSIO, JS20, and water. The uncertainty in the viscosity data was estimated to be ± 1.7%. The density needed for the calculation of the viscosity has been measured by using a glass pycnometer within an accuracy of ±0.04%. In the prediction of the viscosity, the scheme of Assael et al. fails for mixtures of this type differing greatly in size.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01438862
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  • 7
    Digitale Medien
    Digitale Medien
    Saturated liquid viscosities and densities of environmentally acceptable hydrochlorofluorocarbons (HCFCs) (1993)
    Springer
    International journal of thermophysics 14 (1993), S. 339-342 
    Details
    ISSN: 1572-9567
    Schlagwort(e): density ; HCFC ; HCFC-141b ; HCFC-142b ; HCFC-225ca ; HCFC-225cb ; hydrochlorofluorocarbon ; viscosity
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Measurements of saturated liquid viscosities and densities were performed on environmentally acceptable hydrochlorofluorocarbons (HCFCs), CH3CCl2F (HCFC-141b), CH3CClF2 (HCFC-142b; only for viscosity), CF3CF2CHCl2 (HCFC-225ca), and CClF2CF2CHClF (HCFC-225cb), using a capillary viscometer and a glass pycnometer in the temperature range from 273 to 353 K. The uncertainty in the measurement of viscosity is estimated to be 5% based on the comparison of the present data with those in the literature for HCFC-141b. An equation is given to represent our saturated liquid viscosity data as a function of temperature.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00507818
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  • 8
    Digitale Medien
    Digitale Medien
    Revised viscosities for HFC-134a + glycol mixtures from 273 to 333 K (1994)
    Springer
    International journal of thermophysics 15 (1994), S. 109-115 
    Details
    ISSN: 1572-9567
    Schlagwort(e): ethylene glycol ; diethylene glycol ; HFC-134x ; polyethylene glycol(400) ; polypropylene glycol(2000) ; tetraethylene glycol ; triethylene glycol ; viscosity
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The liquid viscosity of six binary mixtures of HFC-134a with glycols [ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycol(400), and polypropylene glyco](2000)] was measured in the temperature range from 273 to 333 K. The viscosity was measured with an improved capillary viscometer instead of the rolling-ball viscometer reported in our previous work. The measurement uncertainty was estimated to be 1.6%. Most of the present data are higher than previous data, and the gap between the two sets of data increases further in low-viscosity regions. The present results obtained with laminar flow are more reliable than previous results, which are indefinite because of the limit of usefulness of the rolling-ball viscometer in low-viscosity regions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01439249
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