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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 150 (1997), S. 121-128 
    ISSN: 1420-9136
    Keywords: Key words: SP interpretation, polarized structures, least-squares method.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract —We have developed a least-squares minimization approach to determine the shape (shape-factor) of a buried polarized body from a residual self-potential anomaly profile. By defining the zero anomaly distance and the anomaly value at the origin on the profile, the problem of the shape-factor determination is transformed into the problem of finding a solution of a nonlinear equation of the form f(q) = 0. Procedures are also formulated to estimate the depth of polarization angle, and the electric dipole moment. The method is applied to synthetic data with and without random noise. The obtained shape-factor agrees very well with the model shape-factor when using synthetic data. After adding ± 2 percent random error in the synthetic data, the shape factor obtained is within ± 4 percent. Finally the validity of the method is tested on a field example from the Ergani copper district, Turkey.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Acta neurochirurgica 124 (1993), S. 86-91 
    ISSN: 0942-0940
    Keywords: Brain death ; brain stem dysfunction ; children brain stem ; compression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The very popular concept of brain death can lead to a defeatist attitude when confronted by a patient with severe brain stem dysfunction. This problem is compounded by the constant controversy surrounding the establishing of criteria to determine brain death. Many young doctors tend to accept the precondition of irreversibility as being any condition that is not explicitly listed in the examples of potentially reversible conditions. In children, however, with compressive brain stem dysfunction, decompressive surgery can lead to a reversal of the dysfunction. In the last three years, we have had the opportunity to observe 5 children who were deeply comatose and apnoeic. All were suffering from compression of the brain stem and experienced dramatic return of brain stem function following emergency decompression. The implications of these findings on the therapeutic attitude towards compressive brain stem lesions in children are exposed. In children with severe brain stem dysfunction, and no evidence of brain stem destruction, decompressive surgery should be undertaken before a diagnosis of brain death is considered.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Acta neurochirurgica 114 (1992), S. 16-19 
    ISSN: 0942-0940
    Keywords: Subarachnoid haemorrhage ; Saudi Arabia ; cerebral aneurysm ; arteriovenous malformation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary It has often been claimed that subarachnoid haemorrhage (SAH) is a rare condition in the Middle East. A 7-1/2-year retrospective study was undertaken to substantiate or disprove this claim. It was found that although the condition is less common than the global average, it was not as rare as previously supposed. The pattern of distribution throughout the population, in terms of sex, was significantly different. The possible reasons for this are discussed.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Acta neurochirurgica 119 (1992), S. 174-175 
    ISSN: 0942-0940
    Keywords: Dural defect ; encephalocoele ; skull base surgery ; reconstruction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A technique for skull base dural defect repair is presented, using two layers of periosteum and biological (Tisseel glue), one on either side of the defect. The method is reliable and relatively simple, and was used to repair a recurrent skull base encephalocoele with great success. The method has application in the reconstruction of any dural defect, whether congenital, traumatic or surgical.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Acta neurochirurgica 72 (1984), S. 45-59 
    ISSN: 0942-0940
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Tissue compatibility of different intracranial implant materials was studied by a tissue culture method using fibroblasts. The same materials were implanted in the crania of rabbits for two months. Undecalcified sections of rabbit crania, including the materials, were stained with Fuchsin and Methylene Blue and Masson-Goldner methods. Soft X-ray was used to detect new bone formation. The materials used were alumina ceramics, hydroxy apatite ceramics, titanium, methylmethacrylate, Sugita aneurysm clip, silicon shunt tube and lyophilized human dura mater (Lyo-dura). Both alumina ceramics and hydroxy apatite ceramics showed an excellent tissue compatibility in-vivo experiments. Although alumina ceramics showed an excellent tissue compatibility in in-vitro experiments, hydroxy apatite ceramics showed less compatibility. Methylmethacrylate prepared one week before the experiment showed excellent compatibility, but the same material prepared at the time of experiment showed only fair compatibility. The titanium and silicon shunt tube showed excellent compatibility. The Sugita aneurysm clip, made from elgiloy, showed fair compatibility, while Lyo-dura showed excellent compatibility in in-vitro experiments, but less compatibility in in-vivo experiments. The reasons for the differences between the results of in-vivo and in-vitro experiments are discussed.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 0942-0940
    Keywords: Occipital osteomyelitis ; epidural abscess ; staphylococcus epidermides ; sinus phlebitis ; intracranial pressure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We report an unusual case of occipital osteomyelitis originating from an old scalp wound, and causing subsequent sinus thrombosis and an epidural abscess. This is the first such case reported. The mechanism of the symptoms and the literature are discussed.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Acta neurochirurgica 110 (1991), S. 189-192 
    ISSN: 0942-0940
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 17 (1995), S. 1121-1130 
    ISSN: 0392-6737
    Keywords: Conductivity of specific semiconductors and insulators ; Amorphous and glassy semiconductors
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary Thick layers of GeTeSe chalcogenide glass have been prepared and subjected to conduction measurements under the effect of both temperature and pressure. The results of theI–V characteristics exhibit transition from high-resistance state to differential negative resistance state through a turnover point. The application of uniaxial pressure shows the similar effect of temperature on that behaviour. Both current and voltage at the turnover point depend on pressure and ambient temperature. The rise of temperature in the conduction path due to joule heating and application of uniaxial pressure as well as the reduction in the energy gap width (β=2.87·10−12eV/N m−2) are estimated and discussed at the turnover point. This behaviour is explained according to the orientation of dipoles randomly dispersed in viscous amorphous matrix.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 18 (1996), S. 963-974 
    ISSN: 0392-6737
    Keywords: Conductivity of specific materials
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary Glass layers of (V2O5)1−x (P2O5) x were prepared by melting appropriate mixtures of V2O5 and P2O5 powders. The measurements ofI–V characteristic curves show three regions of conduction, namely high-resistance state, turnover point with zero-differential resistance region (∂V/∂I=0) and differential negative-resistance region. The turnover point is strongly dependent on composition, sample thickness and temperature. It is found that the increase of the ratio of phosphorus/vanadium reduces conductance as well as it raises the field required to produce turnover behaviour. The data in the range up to the turnover point are discussed on the basis of an electrothermal process. Results of the negative-resistance state could be explained in terms of a hopping mechanism.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Molecular Basis of Disease 1139 (1992), S. 300-306 
    ISSN: 0925-4439
    Keywords: CD25 (IL-2-Rα) expression ; HIV-infected monocytic cell ; PHA-activated human PBMC ; Secretory product
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
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