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  • 1995-1999  (112)
  • 1985-1989  (42)
  • 1975-1979  (9)
  • 1
    Digitale Medien
    Digitale Medien
    Alignment and Orientation Effects for the Indirect Ionization of CH3Cl in the |111.rtbbrac. Rotational State by Fast Electron Impact (1995)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 99 (1995), S. 13597-13599 
    Details
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/j100037a004
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  • 2
    Digitale Medien
    Digitale Medien
    Structure and magnetic moment of α″-Fe16N2 compound films: Effect of Co and H on phase formation (invited) : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5564-5569 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: In order to determine the intrinsic value of magnetic moment, σs, of α″-Fe16N2 compound, the magnetic moment of (α″+α′)-Fe16N2 films is discussed in connection with the degree of N site ordering in nitrogen–martensite. To establish the more general relation between Fe–N martensite structure and σs, the Fe–N system is expanded to Fe–Co–N and Fe–H–N systems. As a result, it is found that (1) The existence of completely the same structure as bulk α″ phase was reconfirmed even in the film form by the precise structural analysis using x-ray diffraction, transmission electron microscopy and Mössbauer analysis, (2) Fe–H martensite was synthesized by using sputtering under Ar+H2 atmosphere, (3) Stable formation of α″-(Fe100−XCoX)16N2 (X=10–30) phase through N site ordering by postannealing is proposed to be fairly difficult due to the sudden decrement of the phase decomposition temperature, Tp.d., of α′-(Fe100−XCoX)–N (X=0–30). Tp.d. of α′-(Fe100−XCoX)–N (X=0–30) phase decreases from 200 °C to RT with increasing Co and N contents, and (4) The intrinsic value of saturation magnetization of the α″-Fe16N2 phase is convinced to be no more than 240 emu/g (≈2.4 μB per Fe atom on average) at 300 K. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.362244
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  • 3
    Digitale Medien
    Digitale Medien
    An experimental study on the shear viscosity of solids (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 122-130 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Viscoelastic solids with high viscosity were experimentally studied with the intention of having them deformed under uniform shear stress. A kind of sandwich method was developed for applying a constant shear stress to a specimen, and its deformation was observed optically using heterodyne interferometry with a sensitivity of 10 nm in displacement measurement. Time-dependent deformation data were analyzed on the basis of a mechanical model of anelasticity plus viscosity. Viscosity in the range of 108–1014 Pa⋅s could be determined at temperatures of 20–200 °C. Through a simulation using the finite element method together with an experiment visualizing the deformation, the specimen deformation was shown to be of an almost uniform shear mode. Experiments were performed to determine the temperature dependence of viscosity for several kinds of glasses near their glass transition Tg, and the determined viscosity values were about 107 Pa⋅s at Tg. The viscosity values measured by a rotation disk viscometer were in good agreement with the present data. The viscosity of some glasses was also measured by the beam bending and penetration methods, and values of 109–1012 Pa⋅s at Tg were obtained. The large discrepancy between the two kinds of data was considered. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.362767
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  • 4
    Digitale Medien
    Digitale Medien
    Anisotropy energies for Y2Fe14B and Nd2Fe14B (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3430-3432 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The approximate d bands for Y2Fe14B and Nd2Fe14B are formulated by Deegan's prescription and the formulas of Slater and Koster. The electronic energies of these crystals with the spin directions [001], [100], [101], and [110] are calculated by Gilat and Raubenheimer's method. The experimental result of the anisotropy energy for Y2Fe14B is analyzed with use of these calculated results by introducing the differences of the number of d electrons for these four states. In Nd2Fe14B the same differences of the number of d electrons are introduced and the contribution to the anisotropy energy due to 4f electrons is deduced. This contribution is analyzed by the use of the crystalline field potential (the localized model) and the band model with d-f elements derived by Lendi. The obtained results are considered to be reasonable.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.338743
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  • 5
    Digitale Medien
    Digitale Medien
    Magnetostriction of amorphous GdFeCo and YFeCo thin films (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5498-5500 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The contribution of Gd and/or (Fe,Co) to the saturation magnetostriction constant λs of pseudobinary Gdx(Fe100−yCoy)100−x (9〈x〈65, y=100, 74,38, or 0) films has been examined by substituting nonmagnetic Y for Gd or nonmagnetic Cu for (Fe,Co) and comparing λs of these alloys at 300 and 80 K. The magnetostriction of Gdx(Fe,Co)100−x as well as Yx(Fe,Co)100−x films are positive and the composition (x) dependence of λs in Gd alloys is similar to Y alloys, but λs of Gd alloys are larger than Y alloys. It was further found that GdxCu100−x (35〈x〈60) shows positive λs at 80 K. These facts indicate positive contribution of Gd to λs in amorphous Gd-(Fe,Co) alloys.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.342312
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  • 6
    Digitale Medien
    Digitale Medien
    On the anisotropy energies for YCo5, RCo5, Y2Co17, and R2Co17 (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3595-3597 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The approximate d bands for YCo5, RCo5, Y2Co17, and R2Co17 (Th2Zn17 and Th2Ni17 type) are formulated by Deegan's prescription and the formulas of Slater and Koster. The experimental results of YCo5 and Y2Co17 are discussed by using these approximate d bands. For RCo5 and R2Co17 the discussions are made by adopting the localized model and the band model for 4f electrons.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.340705
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  • 7
    Digitale Medien
    Digitale Medien
    Stationary magnetic pertubation diagnostic on TFTR (abstract)a) : Proceedings of the tenth topical conference on high temperature plasma diagnostics (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 816-816 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Stationary magnetic perturbations (SMPs) in tokamaks may consist of (1) static magnetic field errors, (2) dynamic magnetic field errors, and (3) stationary MHD modes (or locked mode). The diagnostic aimed to detect the latter two classes of SMPs on the TFTR tokamak has two pairs of sensors, each consisting of a saddle loop for measuring predominantly radial field and auxiliary loops for measuring predominantly toroidal and vertical fields. Members of each pair are placed 180° apart toroidally. Predominantly n=1 SMPs are found in various discharges including ohmic discharges. Abrupt changes in SMP signals precede a "tail-end'' disruption, suggesting a causality relationship. Variations in the SMP signals are also coincident with severe performance degradation of super shots and pellet injected discharges. An analysis of individual and paired signals appears to indicate that these SMPs are dynamic field errors as well as stationary MHD modes. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1146230
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  • 8
    Digitale Medien
    Digitale Medien
    The stability of advanced operational regimes on the Tokamak Fusion Test Reactor : The 38th annual meeting of the Division of Plasma Physics (DPP) of the American Physical Society (1997)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 4 (1997), S. 1589-1595 
    Details
    ISSN: 1089-7674
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The performance of the Tokamak Fusion Test Reactor [D. Meade and the TFTR Group, in Plasma Physics and Controlled Nuclear Fusion Research, Washington, D.C., 1990 (International Atomic Energy Agency, Vienna, 1991), Vol. I, pp. 9–24], as defined by the maximum fusion power production, has been limited, not by confinement, but by stability to pressure-driven modes. Two classes of current profile modification have been investigated to overcome this limit. A new technique has been developed to increase the internal inductance of low-q (q(approximate)4), high-current (Ip〉2MA) plasmas. As was the case at higher edge q, the disruptive β limit has been found to increase roughly linearly with the internal inductance, li. Plasmas with hollow current profiles, i.e., reversed shear, are also predicted and experimentally observed to have increased stability in the negative shear region to ballooning and kink modes. However, performance of these plasmas is still limited by pressure-driven modes in the normal shear region. © 1997 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.872290
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  • 9
    Digitale Medien
    Digitale Medien
    Measurements of beam-ion confinement during tangential beam-driven instabilities in a bean tokamak experiment (1987)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 30 (1987), S. 1839-1852 
    Details
    ISSN: 1089-7666
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: During tangential injection of neutral beams into low-density tokamak plasmas with β〉1%, instabilities are observed that degrade the confinement of beam ions. Neutron, charge-exchange, and diamagnetic loop measurements are examined in order to identify the mechanism or mechanisms responsible for the beam-ion transport. The data suggest a resonant interaction between the instabilities and the parallel energetic beam ions. Evidence for some nonresonant transport also exists.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.866199
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  • 10
    Digitale Medien
    Digitale Medien
    Spin polarization of f bands in RCo5, R2Co17, and R6Mn23 compounds (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3987-3988 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The d bands for RCo5, R2Co17, and R6Mn23 compounds are formulated by Deegan's prescription and the formulas of Slater and Koster. The d-f elements for these energy bands derived by Lendi are taken into account. The spin polarization of the f bands are investigated. The obtained result explains the experimental result by taking into account the feeble exchange splitting in 4f bands. Additionally, the magnetic moment of rare earths is calculated on the basis of the band model and the calculated result is compared with gJ. It is found that in these compounds the spin polarization is saturated and the moments are much the same as gJ.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.338553
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