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  • 1
    Digitale Medien
    Digitale Medien
    Metallic phase analysis of multicomponent systems using a potassium cuprochloride-tartaric acid leach (1978)
    s.l. : American Chemical Society
    Analytical chemistry 50 (1978), S. 1197-1201 
    Details
    ISSN: 1520-6882
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ac50030a048
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  • 2
    Digitale Medien
    Digitale Medien
    Receiver calibration of the JET fast ion and alpha particle diagnostic : Proceedings of the 9th topical conference on high temperature plasma diagnostics (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 4648-4650 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: A collective Thomson scattering diagnostic is being implemented at JET to diagnose the velocity distribution and density of alpha particles and energetic ions. This diagnostic consists of a number of major subsystems including: a high-power 140-GHz gyrotron, a 32-channel 12-GHz bandwidth heterodyne receiver, efficient corrugated waveguide systems, variable polarizers, and in vacuum beam steering mirrors. Proper calibration of these subsystems for signal level losses, positioning, and polarization is imperative for the successful operation of the diagnostic and to facilitate the interpretation of the scattered data. A low-power Gunn oscillator was used to verify the polarization rotation induced by the seven miter bends in the receiver transmission line. The full bandwidth receiver front end losses, including the sapphire tokamak vacuum window, were initially calibrated by using the hot tokamak vessel wall as a blackbody source at approximately 310 °C. Background ECE measurements will be presented.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1143648
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  • 3
    Digitale Medien
    Digitale Medien
    Magnetization reversal in the pinned layer of PtMnCr/NiFe exchange biased bilayers (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 6591-6593 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A study has been made on the effect of annealing time on magnetization reversal of the pinned layer in NiFe(100 Å)/PtMnCr(500 Å) bilayers. In the as-deposited state, the PtMnCr layer is in a metastable, nonmagnetic, disordered fcc phase. Heating progressively transforms the alloy to the stable fct phase which is antiferromagnetic, providing the pinning layer for the soft ferromagnetic NiFe layer. The samples were annealed in a magnetic field at 250 °C for 1, 1.5, 2, and 8 h. The effect of annealing is to both increase the shift of the loops along the field axis and the coercivity of the pinned ferromagnetic layer. Although the widening of the loop is correlated with the degree of antiferromagnet transformation, the exact mechanism for the increased coercivity is unclear. Measurements of loops made at different field sweep rates and after different waiting times at saturation, on the sample annealed for 1.5 h, indicate two possible mechanisms for the increased coercivity: (i) thermally activated reversal of some of the antiferromagnetic layer (AFM) during the measurement of the hysteresis loop and/or (ii) spin-flop coupling between the AFM and ferromagnet moments at a partially compensated interface. © 2001 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1359793
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  • 4
    Digitale Medien
    Digitale Medien
    Thermal activation of magnetization reversal in spin-valve systems (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 89 (2001), S. 5585-5591 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Magnetization reversal in the pinned layer of exchange biased spin valves is a complex process due to the exchange interaction between the ferromagnetic layer and the antiferromagnetic layer. This interaction results in progressive reversal of the antiferromagnetic layer as the magnetization of the ferromagnetic layer changes direction. This reversal of the antiferromagnet will effect the subsequent reversal of the ferromagnet. It is known that this process is thermally activated but time dependence measurements are difficult to interpret, as the exchange field is nonconstant at many positions along the hysteresis curve. Measurements have been made of the time dependence of the reversal of the antiferromagnetic layer by measuring the recoil loops, following different times spent with the ferromagnetic layer saturated in the negative direction. In this manner, the exchange field can be assumed to be constant during the reversal of the antiferromagnet. These measurements show a shift of the loop of the pinned layer towards positive fields. This shift in the loop is interpreted as being the result of reordering of the antiferromagnet. Increasing the temperature during the time spent at saturation shows that the process is driven by thermal activation. Close examination of the degree of loop shift with time spent at saturation shows behavior consistent with thermal activation governed by a distribution of activation energies. At longer times and elevated temperatures, the behavior of the antiferromagnet reversal suggests that this distribution is complex and may be multimodal. The reversal process is, however, reversible even at high temperatures indicating that the elevated temperatures do not significantly change the structure of the ferromagnetic–antiferromagnetic layers or the interface between them. Finally, measurements at 77 K show that the active portion of the energy barrier distribution will change significantly at low temperatures. © 2001 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1365428
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  • 5
    Digitale Medien
    Digitale Medien
    First results of collective scattering on JET (invited) : Proceedings of the eleventh topical conference on high temperature plasma diagnostics (1997)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 275-280 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: The fast ion and α-particle diagnostic at JET is based on collective Thomson scattering of high power millimeter-wave radiation. The principal aim of the diagnostic will be the measurement of the spatially resolved velocity distribution of fast α particles when tritium is introduced in JET plasmas, although several other applications are foreseen. The diagnostic uses a 140 GHz, 500 kW, gyrotron as the source of probing radiation and a heterodyne detection system. The diagnostic came into operation during the last JET operational campaign. First measurements were made of the thermal and mildly suprathermal (induced by ion cyclotron resonance heating) ion feature. The results confirmed expectations, indicating that the diagnostic should give the predicted performance for observation of α-particle populations in the DT phase. The signal-to-noise ratio is limited by the noise on the background radiation (electron cyclotron emission), which has a minimum around 140 GHz only when JET is operated at B∼3.4 T. To further improve the S/N and to make the diagnostic suitable for operation at higher field, which is now being considered for some of the DT plasmas, a viewing dump will be installed before the DT phase. © 1997 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1147822
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  • 6
    Digitale Medien
    Digitale Medien
    Determination of the relative densities of high-voltage stressed-generated traps near the anode and cathode in 10-nm-thick silicon oxides (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 3089-3093 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The relative densities of high-voltage stress-generated traps near the anode and cathode in 10-nm-thick silicon oxides have been measured after both positive and negative gate voltage stressing. The density of traps near the stress anode and cathode were approximately equal after negative gate voltage stressing. The density of traps near the stress cathode was higher than near the stress anode after positive gate voltage stressing. These results implied that impact ionization near the anode was not a significant generator of traps in 10-nm-thick oxides. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.361251
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  • 7
    Digitale Medien
    Digitale Medien
    Complex Wishart matrices and conductance in mesoscopic systems: Exact results (1994)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 35 (1994), S. 6736-6747 
    Details
    ISSN: 1089-7658
    Quelle: AIP Digital Archive
    Thema: Mathematik , Physik
    Notizen: It is noted that the hypothesis of independent random complex elements for the off diagonal blocks (say, M2 and M3) of the transfer matrix describing conductance in a mesoscopic wire allows the eigenvalue distribution of the matrix product M3°M3 (or M2°M2) to be computed exactly. Exact expressions, in terms of double Wronskian and Toeplitz determinants, are derived for the distribution of the smallest and second smallest eigenvalue of this and similar random matrix products. © 1994 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.530639
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  • 8
    Digitale Medien
    Digitale Medien
    MYOCARDIAL INFARCTION AND RHEUMATIC HEART DISEASE IN PREGNANCY CASE REPORT (1975)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 82 (1975), S. 0 
    Details
    ISSN: 1471-0528
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Myocardial infarction is a rare complication of pregnancy, only 45 proven cases having been reported. In only one patient was rheumatic heart disease an associa-ted factor (Goldberger and Pokress, 1950).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1471-0528.1975.tb00677.x
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  • 9
    Digitale Medien
    Digitale Medien
    Occupational sensitization to methoxysilane in fibreglass production (2001)
    Copenhagen : Blackwell Publishing Ltd
    Contact dermatitis 44 (2001), S. 0 
    Details
    ISSN: 1600-0536
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1034/j.1600-0536.2001.44020926.x
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  • 10
    Digitale Medien
    Digitale Medien
    Type I and Type IV allergy to unfractionated heparin and low-molecular-weight heparin with no reaction to recombinant hirudin (2004)
    Oxford, UK; Malden, USA : Munksgaard International Publishers
    Contact dermatitis 51 (2004), S. 0 
    Details
    ISSN: 1600-0536
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.0105-1873.2004.0426f.x
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