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  • 1
    Electronic Resource
    Electronic Resource
    The ferro/ferricyanide couple in an aluminum chloride-1-methyl-3-ethylimidazolium chloride ambient-temperature molten salt (1989)
    s.l. : American Chemical Society
    Inorganic chemistry 28 (1989), S. 421-426 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic00302a011
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Prognosis in traumatic basal ganglia haematoma (1989)
    Springer
    Acta neurochirurgica 97 (1989), S. 114-116 
    Details
    ISSN: 0942-0940
    Keywords: Head trauma ; computed tomography ; haematoma of the basal ganglia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Twenty two patients with traumatic basal ganglia haematoma were studied. The mean Glasgow Coma Score on admission was 7. 17 patients had sustained high acceleration/deceleration injuries. The location and size of haematoma did not correlate with prognosis. Outcome was poor in 7 patients, while 8 patients died.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01772820
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  • 3
    Electronic Resource
    Electronic Resource
    Benign subarachnoid haemorrhage (subarachnoid haemorrhage of unknown aetiology) (1987)
    Springer
    Acta neurochirurgica 86 (1987), S. 89-92 
    Details
    ISSN: 0942-0940
    Keywords: Subarachnoid haemorrhage ; angiography ; unknown aetiology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Forty three patients of subarachnoid haemorrhage of unknown aetiology have been studied for their clinical presentation, rebleed rate, morbidity and mortality. The results have been compared with other similar studies. The present study and those of others indicate a very good prognosis in acute stage. The rebleed rate ranged between 0 and 7% over a period of two to three years. The mortality rate ranged between 0 and 5% during the same period of follow-up. Majority of the patients returned to their full working capacity. The benign nature of this subgroup as compared to the poor outcome of subarachnoid haemorrhage as a whole prompted us to call it “Benign subarachnoid haemorrhage”.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01402290
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  • 4
    Electronic Resource
    Electronic Resource
    Recurrences in meningioma after surgery (1989)
    Springer
    Acta neurochirurgica 100 (1989), S. 104-107 
    Details
    ISSN: 0942-0940
    Keywords: Meningiomas ; recurrence ; progression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary 123 cases of meningioma operated upon between 1975 and 1984 were reviewed. There were 13 cases of symptomatic tumour recurrence and 15 cases of tumour progression. Both, recurrence and progression of the tumour were seen twice as often in males. They were not related to any particular age group or site of origin. Recurrecne was more common in the angioblastic type of meningioma. In the majority, progression of the tumour was seen within two years of the initial operation, while recurrence of the tumour was distributed evenly over time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01403594
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  • 5
    Electronic Resource
    Electronic Resource
    Low- and high-field transport properties of pseudomorphic InxGa1−xAs/In0.52Al0.48As (0.53≤x≤0.65) modulation-doped heterostructures (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 1945-1949 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have grown pseudomorphic InxGa1−xAs/In0.52Al0.48As modulation-doped heterostructures by molecular-beam epitaxy under carefully controlled growth conditions. Mobilities as high as 13 900, 74 000, and 134 000 cm2/V s are measured at 300, 77, and 4.2 K in a heterostructure with x=0.65. Shubnikov–de Haas measurements indicate that the change in the effective mass with increasing In is not significant and is not responsible for the enhancement in mobilities. We believe that the improvement results from reduced alloy scattering, reduced intersubband scattering, and reduced impurity scattering, all of which result from a higher conduction-band offset and increased carrier confinement in the two-dimensional electron gas. The high-field electron velocities have been measured in these samples using pulsed current-voltage and pulsed Hall measurements. A monotonic increase in velocities is observed both at 300 and 77 K with an increase of In content in the channel. Velocities of 1.55×107 and 1.87×107 cm/s are measured at 300 and 77 K, respectively, in a In0.65Ga0.35As/In0.52Al0.48As modulation-doped heterostructure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341748
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  • 6
    Electronic Resource
    Electronic Resource
    The effect of heat treatment on redistribution of fast diffusing impurities in polycrystalline silicon (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 942-944 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of heat treatment on minority carrier surface recombination velocity in polycrystalline silicon samples has been examined in the temperature range (600–900 °C) using the electron-beam induced-current mode of a scanning electron microscope. Minority carrier trap center density, calculated from minority carrier surface recombination velocity data, varying from 8.9×1011 to 6.37×1013 cm−2 have been measured. A finite variation in the minority carrier trap center density indicates that metallic impurities diffuse to the surface from the bulk of the sample. The activation energy of impurity atom diffusion is found to be 1.1±0.1 eV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341900
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of heat treatment on redistribution of hydrogen in directionally cast polycrystalline silicon (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 52 (1988), S. 1670-1671 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effect of heat treatment on the minority-carrier surface recombination velocity in hydrogen-passivated polycrystalline silicon samples has been studied in the temperature range 350–500 °C using the electron-beam-induced current mode of a scanning electron microscope. Minority-carrier trap center densities, calculated from the minority-carrier surface recombination velocity data, varying from 8×1012 to 1.2×1012 cm−2 have been measured. A finite decrease in the minority-carrier trap center density indicates that hydrogen atoms diffuse to the surface from the bulk of the hydrogenated samples. The activation energy of hydrogen diffusion in silicon is found to be 0.53±0.04 eV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.99053
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  • 8
    Electronic Resource
    Electronic Resource
    Nifedipine prevents the pressor response to laryngoscopy and tracheal intubation in patients with coronary artery disease (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Anaesthesia 43 (1988), S. 0 
    Details
    ISSN: 1365-2044
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The efficacy of sublingual nifedipine, administered one minute before anaesthetic induction, in order to minimise the pressor response to laryngoscopy and tracheal intubation was studied in a group of 15 patients who underwent coronary artery bypass surgery. Another group of 15 similar patients served as control. Premedication consisted of oral diazepam 5–10 mg, intramuscular morphine 0.2 mg/kg and promethazine 0.4 mg/kg. Anaesthesia was induced with morphine. 0.1–0.15 mg/kg and thiopentone 3–5 mg/kg. Laryngoscopy and tracheal intubation were facilitated with suxamethonium 1.5 mg/kg. A significant increase in blood pressure occurred during and after laryngoscopy and tracheal intubation in the control group. This increase was absent in the patients pretreated with nifedipine. The nifedipine group also maintained a lower rate-pressure-product than the control group during the period of study. It is concluded that nifedipine 10 mg is a useful pretreatment to prevent the pressor response to laryngoscopy and tracheal intubation in patients with coronary artery disease.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2044.1988.tb06642.x
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  • 9
    Electronic Resource
    Electronic Resource
    Magnetic anisotropy energy in single crystal Y1.8Er0.2Fe14B (invited) (abstract) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3139-3139 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: There has been considerable interest in tetragonal R2Fe14B compounds as a basis for a new class of permanent magnet materials because of the unusually large energy products they exhibit at room temperature for certain rare-earth substitutions. The origin of the high-energy products is directly related to the large saturation magnetization and magnetic anisotropy energy. The magnetocrystalline anisotropy energy is believed to be directly related to an interaction between the 4f-electrons and the crystal field: however, to date few if any direct comparisons have been made between the experimental magnetic anisotropy and crystal field theory. The reason being that the large anisotropy energy makes it very difficult to use conventional torque magnetometry techniques to determine the angular dependence of the magnetic free energy, particularly at low temperatures where the higher-order terms become important. In this investigation we determine the angular dependence of the magnetic free energy as a function of temperature for Y1.8Er0.2Fe14B using high field (6 T) torque magnetometry techniques and make a direct comparison of the free energy with the energy calculated using a model based on crystal field theory. Y1.8Er0.2Fe14B was chosen because the Fe and Er sublattice anisotropy energies nearly cancel at low temperatures making it possible to measure anisotropy. Excellent agreement was obtained between the model and experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340867
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Determination of minority-carrier diffusion length in a p-silicon wafer by photocurrent generation method (1986)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 60 (1986), S. 3550-3552 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A nondestructive method to determine the diffusion length of minority carriers in a p-silicon wafer is outlined. This novel method is based on creating an accumulation layer on one side and an inversion layer on the other side of the wafer by depositing thin semitransparent layers of high (e.g., palladium) and low (e.g., aluminum) workfunction metals, respectively. The wafer acquires a structure akin to p+-p-n+ and is capable of generating a photocurrent when illuminated. The photocurrent Isc (where sc represents short circuit) as a function of the intensity Pin of a monochromatic radiation incident on the accumulation layer (p+) side of the wafer is measured. The diffusion length L is determined from the slope of the Jsc vs Pin curve. The values of L so determined were compared with that determined from the measurement of spectral response by illuminating the wafer from the inversion layer (n+) side and were found to be in excellent agreement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.337610
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