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  • 1
    Electronic Resource
    Electronic Resource
    Letter to the editor Electric field fluctuations (25–35 min) in the midnight dip equatorial ionosphere (2000)
    Springer
    Annales geophysicae 18 (2000), S. 252-256 
    Details
    ISSN: 0992-7689
    Keywords: Ionosphere (electric fields and currents; equatorial ionosphere; ionosphere-magnetosphere interactions)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Measurements with a HF Doppler sounder at Kodaikanal (10.2°N, 77.5°E, geomagnetic latitude 0.8°N) showed conspicuous quasi-periodic fluctuations (period 25/35 min) in F region vertical plasma drift, Vz in the interval 0047/0210 IST on the night of 23/24 December, 1991 (Ap = 14, Kp 〈 4−). The fluctuations in F region vertical drift are found to be coherent with variations in Bz (north-south) component of interplanetary magnetic field (IMF), in geomagnetic H/X components at high-mid latitude locations both in the sunlit and dark hemispheres and near the dayside dip equator, suggestive of DP2 origin. But the polarity of the electric field fluctuations at the midnight dip equator (eastward) is the same as the dayside equator inferred from magnetic variations, contrary to what is expected of equatorial DP2. The origin of the coherent occurrence of equatorial electric field fluctuations in the DP2 range of the same sign in the day and night hemispheres is unclear and merits further investigations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-000-0252-2
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  • 2
    Electronic Resource
    Electronic Resource
    Proinsulin C peptide obviates sympathetically mediated suppression of splenic lymphocyte activity in rats (2000)
    Springer
    Diabetologia 43 (2000), S. 1512-1517 
    Details
    ISSN: 1432-0428
    Keywords: Keywords Atropine ; C peptide ; CRF ; footshock ; parasympathetic nerve ; sympathetic nerve.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Aims/hypothesis. To investigate whether proinsulin C peptide influences sympathetic nerve activity directly or indirectly through parasympathetic nerve activity. Methods. The proliferative response of splenic lymphocytes to Concanavalin A (ConA response) which is known to be suppressed by subjection of rats to footshock or intracerebroventricular injection of corticotropin-releasing factor through sympathetic nerve activation was measured. Effect of C peptide alone or before subjection to footshock or injection of corticotropin-releasing factor was examined. Results. Intraperitoneal injection of C peptide was without effect on the basal ConA response, while subjection to footshock or injection of corticotropin-releasing factor lowered it. In contrast, prior injection of C peptide obviated the footshock and corticotropin-releasing factor-induced suppression of the response. When given intracerebroventricularly, C peptide was also effective at much smaller doses. Prior injection of atropine cancelled the C-peptide effects. Conclusion/interpretation. Our results indicate that C peptide counteracts the sympathetic nerve-mediated suppression of splenic lymphocyte proliferation in an atropine-sensitive manner. Thus, C peptide probably activates the parasympathetic nervous system through the afferent mechanism, that in turn antagonizes the sympathetic nerve-mediated suppression of splenic lymphocyte functions. [Diabetologia (2000) 43: 1512–1517]
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001250051562
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  • 3
    Electronic Resource
    Electronic Resource
    Initial response of silver-impregnated “resting microglia” to stab wounding in rabbit hippocampus (1978)
    Springer
    Acta neuropathologica 44 (1978), S. 31-39 
    Details
    ISSN: 1432-0533
    Keywords: Resting microglia ; Swollen microglia ; Proliferation of glial cells ; EM autoradiography ; Silver impregnation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Adult rabbits received stab wound in the cerebrum and were sacrificed at intervals of 20, 30, and 39h thereafter. Each animal was injected intracere-brally with3H-thymidine 2 h before fixation. Altered brain tissues of the stratum radiatum of hippocampus were taken for examination. Response of “resting microglia” to stab wounding was investigated by electron microscopic autoradiography and by autoradiography applied on silver-impregnated materials. Following results were obtained: (1) Resting microglia undergo marked swelling shortly after the brain damage. We designate these cells as “swollen microglia”. (2) Swollen microglia form the only cell population that proliferate actively in the initial stage of glial response to the brain injury, and (3) astroglia do not proliferate during the same experimental periods, in the rabbit hippocampus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00691636
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  • 4
    Electronic Resource
    Electronic Resource
    A quantitative analysis of human astrocytosis (1988)
    Springer
    Acta neuropathologica 75 (1988), S. 535-537 
    Details
    ISSN: 1432-0533
    Keywords: Astrocytosis ; Hyperplasia ; Quantitative analysis ; Immunohistochemistry ; Human
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The number of astrocytes in an atrophic human brain was counted with the aid of immunohistochemistry for glial fibrillary acidic protein. Microscopically, astrocytosis was remarkable in the cerebral neocortex and white matter. Taking the cortical atrophy into consideration, however, the total number of astrocytes in the cortical layers II – VI was not increased. The number of astrocytes in the white matter was not increased either. It is indicated that astrocytosis does not always mean hyperplasia (net increase of total number) of astrocytes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00687144
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  • 5
    Electronic Resource
    Electronic Resource
    Immunofluorescence studies of the monocytes in the injured rat brain (1981)
    Springer
    Acta neuropathologica 53 (1981), S. 213-219 
    Details
    ISSN: 1432-0533
    Keywords: Monocyte ; Brain macrophage ; Immunofluorescence study ; Ameboid inflammatory cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Rat brain was obtained on the 4th day after its damage by a stab wound. The injured and the normal control brain tissues were stained by the immunofluorescence technique using anti-granulomonocytic rabbit serum. After the fluorescence observation the same tissues were further stained by hematoxylin and eosin (HE) and studied comparatively by light microscopy. The following results were obtained: (1) The normal adult rat brain lacks the cells which react with the antiserum, thus the resting microglia occurring in the normal adult brain are antigenically different from the cells of the monocyte-macrophage system. (2) In the injured brain tissues monocytes extravasate, enter brain parenchyma, and take ameboid forms or become macrophages. (3) Among the reactive cells in the injured brain, all of the brain macrophages and most of the ameboid cells were reactive with the antiserum thereby indicating their monocytic origin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00688024
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  • 6
    Electronic Resource
    Electronic Resource
    Immunohistochemical studies of blood monocytes infiltrating into the neonatal rat brain (1984)
    Springer
    Acta neuropathologica 62 (1984), S. 291-297 
    Details
    ISSN: 1432-0533
    Keywords: Blood monocyte ; Immunofluorescence study ; Neonatal brain ; Ameboid microglia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Brains of normal rats ranging in age from newborn to adult were observed with immunofluorescence technique using anti-granulomonocyte antiserum. For the first 10 days after birth, many cells with positive fluorescence were found in the white matter, the subependyma, the extra-parenchymal spaces, and the leptomeninx, but very few in the gray matter. They were mononuclear, rich in cytoplasm, and globular or irregular in shape. After about day 10 p.n., the positive cells decreased in number and became slender. However, there was no change in the distribution pattern. After about 3 weeks of age, no positive cells were detected in the brain parenchyma, except for very rare necrobiotic ones. It was suggested that blood monocytes infiltrate into the brain parenchyma of normal neonatal rat, but only for a while in the limited areas (white matter and subependyma). They have the morphology and distribution of the “ameboid microglia” of neonatal brain. These monocytes disappear from the brain finally by the end of month 1 p.n.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00687611
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  • 7
    Electronic Resource
    Electronic Resource
    High Power-Density SiC Converter (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 600-603 (Sept. 2008), p. 1223-1226 
    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
    Notes: A compact SiC converter having power densities about 9 W/cm3 is designed andfabricated. It is confirmed that the converter operates in a thermally permissive range. The powerloss of the module of the converter measured under motor operations is less than 50% of thesimilar-rating Si module loss. The shrink of the effective volume of DC-link capacitor is necessaryto achieve the high power-density SiC converter, in addition to the decrease of the cooling systemvolume due to the loss reduction caused by SiC devices
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/20/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.600-603.1223.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Characterization of Electrical Properties in SiC Crystals by Raman Scattering Spectroscopy (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 600-603 (Sept. 2008), p. 501-504 
    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
    Notes: We characterized the 4H- and 6H-SiC bulk crystals with graded doping and epitaxial filmswith various carrier densities by Raman scattering spectroscopy. Electrical properties such as freecarrier density were examined for the SiC crystals through Raman measurements of the A1LO-phonon plasmon coupled (LOPC) mode and its line shape analysis. The peak frequency and bandwidth of LOPC mode varied with carrier density in the range from 1016 to 1019 cm-3. The line shapeanalysis revealed that the carrier density in the SiC crystals can be simply estimated from measuredfrequency shift of LOPC mode for 4H- and 6H-SiC crystals
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/20/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.600-603.501.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Raman Scattering Analysis of Electrical Property and Crystallinity in Freestanding GaN Crystals with Various Impurity Concentrations (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 600-603 (Sept. 2008), p. 1293-1296 
    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
    Notes: We characterized the HVPE grown freestanding GaN crystals with various shallow impurityconcentrations by Raman scattering spectroscopy. Electrical properties such as free carrierdensity were examined for the GaN crystals through Raman measurements of the A1 LO-phononplasmon coupled (LOPC) mode and its line shape analysis. The asymmetric broadening and theup-shift of the LOPC band were clearly observed as the carrier density increased from 1017 to 1019cm-3. The line shape analysis revealed that the carrier density in the GaN crystals can be simply estimatedfrom measured frequency shift of LOPC mode. The variations of the width for TO phononbands were also observed in this carrier density range. The band widths were slightly increased by 0.2cm-1 as the impurity concentration increased from 1018 to 1019 cm-3 in samples with low dislocationdensity
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/20/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.600-603.1293.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    A quantum field theory of lattice dynamics and melting in compounds (1989)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 11 (1989), S. 1441-1449 
    Details
    ISSN: 0392-6737
    Keywords: Phonons and vibrations in crystal lattices
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si presenta una teoria unificata sulla dinamica dei reticoli e sulla fusione nei composti considerando l’interazione di Coulomb. La temperatura di fusione è determinata dal valore medio delle autofrequenze degli atomi. Si applica la teoria alla zinco-blenda e a cristalli con struttura del tipo di sali di rocca.
    Abstract: Резюме Предлагается теория динамики решетки и плавления в химических соединениях, которя учитывает кулоновское взаимодействие. Температупа плавления определяется, как средияя величина собстенных чатстот атомов. Предложенная теория применяется к кристаллам со структурой цинковой обманки и кчменной соли.
    Notes: Summary A unified theory on the lattice dynamics and the melting in compounds is presented by taking into account the Coulomb interaction. The melting temperature is determined by the mean value of the eigenfrequencies of the atoms. The theory is applied to zincblende and rock salt structure crystals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02450504
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