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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 3790-3792 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A procedure for fabricating all refractory superconducting tunnel junctions with a semiconducting barrier has been developed. The process is based on the deposition of a four-layer Nb–Al–CdS–Nb structure without breaking the vacuum. The photoconducting properties of the barrier produce a light-sensitive behavior of the junctions. Preliminary measurements have shown the occurrence of light induced quasiparticle tunneling. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 5145-5150 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Direct current-superconducting quantum interference devices (SQUIDs) characterized by asymmetric Josephson junctions have never been used for applications. In order to demonstrate their potential advantages, a throughout numerical analysis of different asymmetric configurations has been carried out. A damping resistance has been included in the SQUID circuit and the thermal noise associated with junction and damping resistances has been considered in the numerical model. Magnetic modulations and flux noise spectral densities have been computed as a function of many parameters (bias current, asymmetry, SQUID inductance, and damping resistance) and the performance of symmetric and asymmetric devices have been compared. The results show that, by properly optimizing the SQUID design, asymmetric SQUIDs are characterized by higher magnetic flux to voltage transfer coefficient and lower flux noise. As a result, asymmetric configurations can be very useful in all the applications where high sensitivity is required. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 3989-3991 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Fully integrated low-critical-temperature magnetometers based on asymmetric superconducting quantum interference devices have been designed, fabricated, and characterized. The large value of the flux to voltage transfer coefficient, typical of such configurations, allow a direct coupling to an external preamplifier without the need of an impedance matching flux transformer or additional positive feedback circuitry. This simplifies the read-out electronics, as required in multichannel systems for low-noise measurements. The values of the magnetic flux noise and field sensitivity, obtained so far, are 3–5 μΦ0/Hz1/2 and 6–7 fT/Hz1/2, respectively. These results are already suitable for biomagnetic applications and can be further improved by properly optimizing the device parameters. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 2943-2945 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Direct current superconducting quantum interference devices made by Josephson junctions with asymmetric shunt resistances have been numerically investigated in the low temperature regime. When combined with a damping resistance, the asymmetry leads to a flux to voltage transfer coefficient several times larger than the one typical of symmetric devices, together with a lower magnetic flux noise. These results show that this type of asymmetric device may replace the standard ones in a large number of magnetometric applications, improving the sensitivity performance. The large transfer coefficient may also simplify the readout electronics allowing a direct coupling of asymmetric devices to an external preamplifier, without the need of an impedance matching flux transformer. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 3542-3544 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Superconducting quantum interference devices (SQUIDs) have been fabricated using YBa2Cu3O7−x [100] 45°-tilt grain-boundary Josephson junctions based on a controllable biepitaxial technique. These devices are characterized by large characteristic voltages, desirable magnetic-flux-to-voltage transfer parameters and low flux noise. An energy resolution of 1.6×10−30 J/Hz at liquid helium has been measured, which is the lowest value reported for biepitaxial SQUIDs. These junctions exhibit a phenomenology different from traditional [001] 45°-tilt biepitaxials probably due to the absence of π junctions. The performance of the presented SQUIDs demonstrates that significant improvements in the biepitaxial technique are possible, and the resulting devices have potential for applications. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Tetrahedron Letters 35 (1994), S. 3365-3366 
    ISSN: 0040-4039
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Physica C: Superconductivity and its applications 232 (1994), S. 44-48 
    ISSN: 0921-4534
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1432-1459
    Keywords: Peroneal muscular atrophy ; Ataxia ; Myoclonic epilepsy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Bei zwei Brüdern im Alter von 17 und 11 Jahren fanden sich Pes cavus, fehlende Muskeleigenreflexe, hochgradig gestörte Tiefensensibilität, eine Ataxie, ein Nystagmus, eine Dysarthrie und eine partielle Epilepsie mit myoklonischen Anfällen. Elektromyographisch ließ sich eine hochgradige Verlangsamung der motorischen Erregungsleitung an den unteren Extremitäten mit verlängerter distaler Latenz nachweisen. Eine Biopsie des Nervus peronaeus ergab einen vollständigen Myelinverlust zahlreicher Fasern. Sowohl der Vater wie 7 Onkel väterlicherseits hat einen Pes cavus, Hammerzehen und leichte periphere Sensibilitätsstörungen. Bei 3 von 7 Untersuchten fanden sich eine Verlangsamung der motorischen Erregungsleitung peripherer Nerven. EEG im Bereiche der Norm. Die epileptischen Anfälle manifestierten sich zunächst als Myoklonie der oberen rechten Extremitäten besonders während des Schlafes. Im EEG der beiden Exploranden zeigten sich fokale oder generalisierte epileptische Entladungen. Beim älteren der Brüder trat ein Status partialer motorischer Anfälle mit rechtsseitigen Adversiv-Attacken auf. Er starb plötzlich an einer Bronchopneumonie am 3. Tag des Status epilepticus. Die neuropathologische Untersuchung ergab eine nahezu vollständige Demyelinisierung des Tractus dentatorubralis und eine partielle Degeneration des Gollschen und Burdachschen Tractus im Halsmark. Die Zuordnung dieses Syndromes wird diskutiert und es wird eine autosomal dominante Vererbung mit unvollständiger Penetranz beziehungsweise unterschiedlicher Expressivität angenommen.
    Notes: Summary Two brothers, 17 and 11 years old, presented with pes cavus, absence of deep tendon reflexes, peripheral vibratory sensory loss, ataxia, tremor, nystagmus, dysarthria and partial myoclonic epilepsy. Electromyography showed severe slowing of motor conduction velocity in the lower extremities and increased distal latencies. A peroneal nerve biopsy showed absence of myelin sheath in most fibres resulting in numerous demyelinated nerve fibres. The father and seven uncles on the paternal side had pes cavus, hammer toes and moderate vibratory peripheral sensory loss. Three of seven siblings had slow motor conduction velocities on EMG. None had EEG abnormalities. Epilepsy started at an early age in both patients with myoclonic jerks of the right arm especially during sleep. EEG recordings were characterized by focal or diffuse epileptiform discharges. In the elder brother a partial motor epileptic status occurred with adversive seizures involving the right side of the body. He died of a broncopneumonia after 3 days of this epileptic status. Histopathological examination showed a severe demyelination of dentato-rubral pathways in the cerebellum and a partial degeneration of Goll and Burdach's tracts in the cervical spinal cord. The nosological classification of this syndrome is discussed and an autosomal dominant inheritance with incomplete penetrance or variable expressivity is suggested.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Journal of neurology 220 (1979), S. 21-29 
    ISSN: 1432-1459
    Keywords: Thymic scan ; Thymus hyperplasia ; Thymoma ; Myasthenia gravis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung 53 Patienten wurden mit einem 75Se-Methionin-Scan untersucht, um die Rolle der Thymusdrüse bei der Myasthenia Gravis zu beurteilen. Die Thymusdrüsen von 28 dieser Patienten wurden histologisch untersucht. Fünf von sechs primären Thymustumoren konnten mit dieser Technik nachgewiesen werden, und 8 von 12 Hyperplasien wurden festgestellt. Die oben genannten Daten sprechen dafür, daß 75Se-Methionin-Scan eine nützliche, nicht schädliche Untersuchung ist, um Neoplasien und abnorme Keimzentren zu diagnostizieren.
    Notes: Summary Fifty-three patients were investigated by 75Se methionine scan in order to evaluate the role of the thymus gland in myasthenia gravis. The thymus of 28 of the above patients was examined histologically. Five out of six thymomas were detected with this technique and eight out of twelve hyperplasias were revealed. The above data suggests that 75Se methionine scan is a useful, innocuous tool for diagnosing neoplasms and abnormal germinal centers in thymus glands.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Physica B: Physics of Condensed Matter 194-196 (1994), S. 1745-1746 
    ISSN: 0921-4526
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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