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  • 1
    Electronic Resource
    Electronic Resource
    The role of the surface depression of the pair potential on the Josephson and quasi-particle tunnelling in high-T c superconductors (1994)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 16 (1994), S. 1979-1985 
    Details
    ISSN: 0392-6737
    Keywords: Proximity effects, tunneling phenomena and Josephson effects ; Superconducting perovskites and related structures ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary We discuss the influence of the intrinsic surface depression of the order parameter on the temperature dependence of the Josephson critical currentI c(T) and, tentatively, on the quasi-particle tunnelling conductance in a superconductor with a very short coherence length. The comparison with the experiments shows that the presence of a surface-depressed pair potential can explain the large deviations of theI c(T) from the ideal BCS behaviour that we recently observed in Bi2Sr2CaCu2O8+x Josephson break junctions and could mimic the presence of a broadening in the Superconductor-Insulator-Normal tunnelling conductance of the same high-T c superconductor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02471855
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  • 2
    Electronic Resource
    Electronic Resource
    Influence of the ionizing and displacing components of proton irradiation on structural changes in boron nitride (1997)
    Springer
    Technical physics letters 23 (1997), S. 511-512 
    Details
    ISSN: 1090-6533
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Raman spectroscopy has been used to study structural changes in pyrolytic boron nitride irradiated by 7 MeV protons. It is shown that the ionizing component of the proton irradiation effectively reduces the number of grain boundaries while the displacing component induces the formation of stacking faults in the boron nitride structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1261730
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  • 3
    Electronic Resource
    Electronic Resource
    Upward high-energy field-aligned electron beams above the polar edge of auroral oval: observations from the SKA-3 instruments onboard the Auroral Probe (Interball-2) (1998)
    Springer
    Annales geophysicae 16 (1998), S. 1046-1055 
    Details
    ISSN: 0992-7689
    Keywords: Ionosphere (particle acceleration; wave-particle interactions) ; Magnetospheric physics (magnetosphere-ionosphere interactions)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract A new phenomenon was found at the polar edge of the auroral oval in the postmidnight-morning sectors: field-aligned (FA) high-energy upward electron beams in the energy range 20–40 keV at altitudes about 3 RE, accompanied by bidirectional electron FA beams of keV energy. The beam intensity often reaches more than 0.5 · 103 electrons/s · sr · keV · cm2, and the beams are observed for a relatively long time (∼3 ∼ 102–103 s), when the satellite at the apogee moves slowly in the ILAT-MLT frame. A qualitative scenario of the acceleration mechanism is proposed, according to which the satellite is within a region of bidirectional acceleration where a stochastic FA acceleration is accomplished by waves with fluctuating FA electric field components in both directions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-998-1046-1
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  • 4
    Electronic Resource
    Electronic Resource
    Acousto-optical effect in the luminescence excitation spectrum of HgI2 (1999)
    Springer
    Physics of the solid state 41 (1999), S. 1801-1804 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A study of the photoluminescence excitation spectrum in a crystal of mercury diiodide is reported. Each of the two luminescence bands peaking at 543 and 572–575 nm investigated was found to have its own excitation spectrum. The excitation spectrum of the 575-nm line in the long-wavelength doublet band has been observed to be sensitive to strong ultrasound vibrations and preliminary irradiation of the sample by 590-nm light. This line is associated with radiative recombination of photocarriers at intrinsic point defects (vacancies or iodine and mercury interstitials) located close to dislocations. The binding energy of the photosensitive center to a dislocation was estimated from the change in the excitation spectrum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1131101
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  • 5
    Electronic Resource
    Electronic Resource
    Luminescence kinetics in proton-irradiated quartz glasses (2000)
    Springer
    Technical physics letters 26 (2000), S. 475-477 
    Details
    ISSN: 1090-6533
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract It is experimentally demonstrated that the intensity of the radiation-induced luminescence (RIL) of KU-1 and KI quartz glasses at 450 nm increases more than ten times upon the proton irradiation (proton energy, 8 MeV; dose rate, 5×103 Gy/s; dose, up to 1.2×107 Gy) to a dose of 106 Gy. At a dose exceeding 106 Gy, the spectral efficiency of the ionizing radiation energy conversion reached ∼10−6 nm−1 in the maximum of the RIL band at 450 nm for all types of glasses. After preliminary low-rate γ-irradiation (below 0.5 Gy/s), the RIL intensity in the beginning of the proton irradiation and its variation with the proton dose depend on the concentration of impurities in the quartz glass. The RIL intensity buildup depends on the formation of positively and negatively charged microscopic regions in glasses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1262882
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  • 6
    Electronic Resource
    Electronic Resource
    Transient optical phenomena in quartz fibers under high-power pulsed reactor irradiation (2000)
    Springer
    Technical physics letters 26 (2000), S. 239-240 
    Details
    ISSN: 1090-6533
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Measurements of the intensity of emission and induced optical absorption at 400–750 nm in KU-1 quartz fibers were performed under pulsed irradiation in a BARS-6 reactor (pulse duration, 80 μs; dose per pulse, up to 5×1012 neutrons/cm2 (E〉0.2 MeV); dose rate, up to 105 Gy/s). The nondelayed emission component is due to the Cerenkov radiation, the weak relaxation component has a relaxation time of ∼150±50 μs, and the radiation-induced optical absorption reaches a value of 2.5×10−4 cm−1 (relaxation time, 600–1200 μs). A nonlinear dependence of the Cerenkov radiation on the dose rate and the presence of the relaxation emission component and the transient optical absorption may be associated with an optical inhomogeneity of glass induced by the high-power reactor irradiation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1262804
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  • 7
    Electronic Resource
    Electronic Resource
    Intrinsic surface depression of the order parameter under mixed (s+id)-wave pair symmetry and its effect on the critical current of high-T c SIS Josephson junctions (1997)
    Springer
    Journal of superconductivity and novel magnetism 10 (1997), S. 657-662 
    Details
    ISSN: 1557-1947
    Keywords: High-T c superconductors ; order parameter ; Josephson junctions ; Josephson critical current ; pair symmetry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract An intrinsic gap depression at the superconductor-insulator interface due to the very short value of the coherence length in high-T c superconductors [HTS] is considered in the framework of a mixed (s+id)-wave pair symmetry for the order parameter ranging from pures to pured-wave. This gap depression acts as the main physical agent causing the relevant reduction ofI c (T)R n (T) values with respect to BCS expectations in HTS SIS Josephson junctions. Good agreement with various experimental data is obtained with both pures-wave and pured-wave symmetries of the order parameter, but with amounts of gap depression depending on the pair symmetry adopted. Regardless of the apir symmetry considered, these results prove the importance of the surface order-parameter depression in the correct interpretation of theI c (T)R n (T) data in HTS SIS junctions. In the case of a planar YBCO-based junction the use of the de Gennes condition allowed us to tentatively obtain an upper limit for the amount ofd-wave present in the gap of YBCO.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02471928
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  • 8
    Electronic Resource
    Electronic Resource
    Selection of the design production of hydroelectric stations when planning the fuel supplies of power interties with a large share of hydropower (1986)
    Springer
    Power technology and engineering 20 (1986), S. 53-60 
    Details
    ISSN: 1570-1468
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Conclusions 1. The minimum expenditures in the power intertie of Siberia occur when planning fuel supplies on the basis of a 95% probability of production of the hydrostations; as a consequence of this, it is expedient to take as the standard planning of fuel supplies on the basis of a firm production of hydrostations with a 95% probability (instead of the existing 50%). 2. The conclusion obtained for the power intertie of Siberia with a large share of hydrostations having deep carryover reservoirs can be extended as a first approximation also to other power systems with a large share of highly regulated hydropower, but this problem should be solved after conducting investigations analogous to those described above. 3. The investigations conducted showed the expediency for the power intertie of Siberia to correct fuel deliveries, which depend on the production of hydrostations, in May and to take this period as the standard for the given region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01435294
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  • 9
    Electronic Resource
    Electronic Resource
    Intrinsic Surface Depression of the Order Parameter Under Mixed (s + id)-Wave Pair Symmetry and Its Effect on the Critical Current of High-T c SIS Josephson Junctions (1997)
    Springer
    Journal of superconductivity 10 (1997), S. 657-662 
    Details
    ISSN: 1572-9605
    Keywords: High-T c superconductors ; order parameter ; Josephson junctions ; Josephson critical current ; pair symmetry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract An intrinsic gap depression at the superconductor–insulator interface due to the very short value of the coherence length in high-T c superconductors [HTS] is considered in the framework of a mixed (s+id)-wave pair symmetry for the order parameter ranging from pure s to pure d-wave. This gap depression acts as the main physical agent causing the relevant reduction of I c (T)R n (T) values with respect to BCS expectations in HTS SIS Josephson junctions. Good agreement with various experimental data is obtained with both pure s-wave and pure d-wave symmetries of the order parameter, but with amounts of gap depression depending on the pair symmetry adopted. Regardless of the pair symmetry considered, these results prove the importance of the surface order-parameter depression in the correct interpretation of the I c (T)R n (T) data in HTS SIS junctions. In the case of a planar YBCO-based junction the use of the de Gennes condition allowed us to tentatively obtain an upper limit for the amount of d-wave present in the gap of YBCO.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022610530471
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    The nature of β-relaxation in polymers (1983)
    Springer
    Polymer bulletin 9 (1983), S. 98-105 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary An activation analysis of relaxational β-transition in polymers, oligomers and simple molecular glasses has been made with the aid of DSC and the internal friction (IF) on the specimens under static load. On the basis of the results obtained, literature data and the correlations found, a conclusion has been drawn that β-transition in the linear polymers is defined by the rotation of the chain portion commensurable with Kuhn's segment as well as the intermolecular potential barriers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00275575
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