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  • 1
    Electronic Resource
    Electronic Resource
    Investigation of silicon field-effect transistors in cryogenic amplifiers for radio frequency superconducting quantum interference devices (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 3296-3299 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have prepared n-channel silicon field-effect transistors, which are capable of working at liquid helium temperatures (4.2 K) and used them in cooled preamplifiers for rf superconducting quantum interference device (SQUID) readout electronics. All metallizations of these transistors were made of niobium, to study the possibility of a further integration of a SQUID and FET on the same chip. Using the FETs in a cooled preamplifier together with a rf SQUID gradiometer, the flux noise of the system could be reduced by a factor of 3 compared to a room temperature low noise preamplifier. We have also performed calculations of a possible increase of the substrate temperature due to the power dissipation of the FET and have measured the cross talk between FET and SQUID. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145497
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  • 2
    Electronic Resource
    Electronic Resource
    Negative remanence in exchange coupled Co/Rh/Co sandwich structures: Experiment and model (abstract) : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 3914-3914 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: It is shown within a simple micromagnetic model calculation that novel magnetic hysteresis behavior including the unusual phenomenon of negative remanence can occur in asymmetric exchange coupled bi- and multilayer films. The latter denotes a magnetization state opposite to the field direction in which the sample was premagnetized. We have observed such effects in polar Kerr hysteresis measurements from perpendicularly oriented sandwich structures grown on Pt(111) buffers, e.g., Co(0.8 nm)/Rh(0.9 nm)/Co(0.8 nm). The model minimizes the total magnetic energy as function of the applied field and angles phi1 and phi2 of the two layers with respect to the film normal (easy) direction. The energy includes besides external field energy, a demagnetization term and interlayer exchange and anisotropy contributions. The general shape of the experimentally observed hysteresis loops can be reproduced, if one assumes slight asymmetries in the magnetic properties of the ferromagnetic layers. These could be caused by unequal thicknesses and/or local roughnesses which would alter the interfacial anisotropy contributions. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365069
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  • 3
    Electronic Resource
    Electronic Resource
    One-week triple therapy with omeprazole, amoxycillin and either clarithromycin or metronidazole for cure of Helicobacter pylori infection (1996)
    Oxford BSL : Blackwell Science Ltd
    Alimentary pharmacology & therapeutics 10 (1996), S. 0 
    Details
    ISSN: 1365-2036
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Aim: The present study was designed to evaluate the efficacy and tolerability of 1-week triple therapy regimens for Helicobacter pylori. Methods: In two consecutive series, 120 patients with proven H. pylori infection and peptic ulcer disease or functional dyspepsia were treated with either omeprazole 20 mg b.d., amoxycillin 1 g b.d. and clarithromycin 250 mg b.d. (OAC; n=60) or with omeprazole 20 mg b.d., amoxycillin 1 g b.d. and metronidazole 400 mg b.d. over 1 week (OAM; n=60). H. pylori infection was assessed by rapid urease test, culture and histology before and 4 weeks after cessation of the eradication therapy. Results: H. pylori eradication succeeded in 53 out of 60 patients by omeprazole–amoxycillin–clarithromycin (OAC) (88%; 95% CI 77–95%) and in 47 out of 60 patients by omeprazole–amoxycillin–metronidazole (OAM) (78%; 95% CI 66–88%) (P=0.22). Nine patients of each group available for follow-up reported adverse events (15.0 and 15.5%, respectively) without necessity of discontinuation of the study medications. Serious adverse events were not observed. Conclusions: Simple and convenient 1-week triple therapies consisting of omeprazole, amoxycillin and either clarithromycin or metronidazole are sufficiently effective in eradicating H. pylori infection.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2036.1996.727119000.x
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  • 4
    Electronic Resource
    Electronic Resource
    The corpus callosum in communicating and noncommunicating hydrocephalus (1995)
    Springer
    Neuroradiology 37 (1995), S. 212-218 
    Details
    ISSN: 1432-1920
    Keywords: Corpus callosum ; Hydrocephalus ; Dementia ; Magnetic resonance imaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract To investigate morphological changes in the corpus callosum in hydrocephalus and to correlate them with clinical findings we studied sagittal T2*-weighted cine MR images of 163 patients with hydrocephalus. The height, length and cross-sectional area of the corpus callosum were measured and related to the type of cerebrospinal fluid flow anomaly and to clinical features, especially dementia. With expansion of the lateral ventricles the corpus callosum showed mainly elevation of its body and, to a lesser degree, increase in length. Upward bowing was more pronounced in noncommunicating than in communicating hydrocephalus. Dorsal impingement on the corpus callosum by the free edge of the falx correlated with the height of the corpus callosum. Cross-sectional area did not correlate with either height, length or impingement; it was, however, the strongest anatomical discriminator between demented and nondemented patients. The area of the corpus callosum was significantly smaller in patients with white matter disease. Our findings suggest that, due to its plasticity, the corpus callosum can to some degree resist distortion in hydrocephalus. Dementia, although statistically related to atrophy of the corpus callosum, is possibly more directly related to white matter disease.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01578260
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  • 5
    Electronic Resource
    Electronic Resource
    The corpus callosum in communicating and noncommunicating hydrocephalus (1995)
    Springer
    Neuroradiology 37 (1995), S. 212-218 
    Details
    ISSN: 1432-1920
    Keywords: Key words Corpus callosum ; Hydrocephalus ; Dementia ; Magnetic resonance imaging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract To investigate morphological changes in the corpus callosum in hydrocephalus and to correlate them with clinical findings we studied sagittal T2*-weighted cine MR images of 163 patients with hydrocephalus. The height, length and cross-sectional area of the corpus callosum were measured and related to the type of cerebrospinal fluid flow anomaly and to clinical features, especially dementia. With expansion of the lateral ventricles the corpus callosum showed mainly elevation of its body and, to a lesser degree, increase in length. Upward bowing was more pronounced in noncommunicating than in communicating hydrocephalus. Dorsal impingement on the corpus callosum by the free edge of the falx correlated with the height of the corpus callosum. Cross-sectional area did not correlate with either height, length or impingement; it was, however, the strongest anatomical discriminator between demented and nondemented patients. The area of the corpus callosum was significantly smaller in patients with white matter disease. Our findings suggest that, due to its plasticity, the corpus callosum can to some degree resist distortion in hydrocephalus. Dementia, although statistically related to atrophy of the corpus callosum, is possibly more directly related to white matter disease.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01578260
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  • 6
    Electronic Resource
    Electronic Resource
    fac-Aqua[1,2-bis(diphenylphosphino)ethane-P,P']tricarbonylmanganese tetrafluoroborate (monoclinic form) (1999)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 55 (1999), S. 0-0 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S010827019909856X
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  • 7
    Electronic Resource
    Electronic Resource
    Applications with a new low-temperature UHV STM at 5 K (1998)
    Springer
    Applied physics 66 (1998), S. S27 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 36.40.+d; 61.16.-d; 68.35.Bs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: 2 , which occurs below a transition temperature of 33.5 K, was imaged.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390051093
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  • 8
    Electronic Resource
    Electronic Resource
    Differential ontogenic pattern of metabotropic [3H]-l-glutamate receptors in normal and granule cell-deficient mouse cerebellum (1996)
    Springer
    Experimental brain research 107 (1996), S. 361-366 
    Details
    ISSN: 1432-1106
    Keywords: Metabotropic glutamate receptors ; Cerebellar ontogeny ; Methylazoxymethanol ; Mouse
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract [3H]-l-glutamate binding site distribution corresponding to metabotropic receptors was studied by autoradiography during normal and altered cerebellar ontogeny in mice treated on postnatal days (PND) 5 and 6 with the antimitotic methylazoxy-methanol (MAM). Quisqualate (QA)-induced and (2S, 3S, 4S)-α-(carboxycyclopropyl)-glycine (L-CCG-I)-induced [3H]-l-glutamate binding inhibition allowed us to distinguish between group I and group II metabotropic receptor binding sites. In control cerebellar cortex, the QA-sensitive binding site density increases during development, while the L-CCG-I-sensitive binding site density decreases. In the deep cerebellar nuclei (DCN), both populations of binding sites decrease during ontogeny. The antimitotic treatment induces: (1) a slight but significant increase in the QA-sensitive binding sites in the DCN at PND 10 and in the cerebellar cortex beginning from PND 20; (2) a retarded decrease in the L-CCG-I-sensitive metabotropic receptor binding site density. These differences could be due to a retarded cell maturation and/or an over-expression of some postsynaptic receptors in the adult cerebellum in response to the afference deficiency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00230418
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  • 9
    Electronic Resource
    Electronic Resource
    Dynamics of a stochastically driven running sandpile (1995)
    Springer
    Journal of nonlinear science 5 (1995), S. 167-188 
    Details
    ISSN: 1432-1467
    Keywords: self-organized criticality ; stochastic processes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Summary We analyze in detail a one-dimensional sandpile with spatially stochastic driving at a finite rate. The dynamics shows three different phases, depending on the on-site relaxation rate and the stochastic driving rate. Two phases are characterized by the presence of traveling waves. The third phase shows algebraic relaxation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01208378
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  • 10
    Electronic Resource
    Electronic Resource
    Age, geodynamic setting, and mantle enrichment processes of a K-rich intrusion from the Meissen massif (northern Bohemian massif) and implications for related occurrences from the mid-European Hercynian (1997)
    Springer
    Geologische Rundschau 86 (1997), S. 556-570 
    Details
    ISSN: 0016-7835
    Keywords: Key words K-rich rock ; Amphibole ; 40Ar/39Ar laserdating ; Mantle enrichment ; Moldanubian ; Post-collisional intrusion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  The plutonic complex of the Meissen massif (northern margin of the Bohemian massif) comprises dioritic to mainly monzonitic and granitic rocks. The diorite to monzonite intrusions show major and trace element patterns typical for shoshonitic series. The chemical signatures of less crustally contaminated diorites are similar to arc-related shoshonitic rocks derived from continental lithospheric mantle (CLM) sources previously enriched by subduction of altered oceanic crust. Laser step heating 40Ar/39Ar analyses on actinolitic to edenitic amphiboles from geographically different occurrences of the monzonitic intrusion yielded concordant plateau ages as well as total gas ages ranging from 329.1±1.4 to 330.4±1.4 Ma and from 330.4±2.1 to 330.6±1.8 Ma, respectively. These cooling ages are indistinguishable from sensitive highresolution ion microprobe (SHRIMP) 238U/206Pb intrusion ages measured on magmatic zircon rims from the monzonite (Nasdala et al., submitted). This shows that the monzonite intrusion is probably not related temporally to active subduction because it postdates eclogites of the adjacent Saxonian Erzgebirge by approximately 20 Ma. The shoshonitic magmas intruded during strike-slip tectonism along the Elbe valley zone. The enrichment of their mantle sources may be of Upper Devonian/Lower Carboniferous age or older. Intrusions of shoshonitic to ultra-potassic (K-rich) rocks during the Upper Visean/Namurian are widespread in the Moldanubian zone. Based on similar ages and structural relationships a similar post-collisional setting to the Meissen shoshonitic rocks can be demonstrated. Most of these occurrences cut high-grade nappe units which were subducted during the Upper Devonian/Lower Carboniferous. In contrast to the Meissen massif, at least the ultra-potassic members of the Central and the South Bohemian batholiths were derived from CLM sources enriched by fluids or melts released from subducted oceanic crust and by greater portions of crustal material. Despite the similar post-collisional geodynamic setting of the K-rich intrusions, different enrichment processes generated mid-European Hercynian CLM sources with heterogeneous major and trace element and isotopic signatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s005310050163
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