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  • American Institute of Physics (AIP)  (5.994)
  • American Physical Society (APS)
  • International Union of Crystallography (IUCr)
  • 1985-1989  (7.397)
  • 1987  (7.397)
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Verlag/Herausgeber
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  • 1985-1989  (7.397)
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  • 1
    Digitale Medien
    Digitale Medien
    15-cm hybrid ion diode on PBFA-I (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 3522-3534 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Diode experiments on the PBFA-I pulser using a magnetically insulated ion diode are described. The insulating magnetic field is supplied by self-field due to the ion current plus the field generated by a series field coil. In the experiments described here, the diode operated at the 10-TW, 2.5-MV level with over 300 kJ going to the diode on many shots. The operation of the diode, the dielectric anode, and the proton beam focusing are described.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.339275
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  • 2
    Digitale Medien
    Digitale Medien
    Achromatic storage ring for free-electron lasers (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 3550-3551 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We discuss the possibility of taking advantage on achromatic magnetic mirrors (α magnets) to construct a storage ring for free-electron lasers, where the electron trajectories are energy independent in the straight sections. This property might be efficiently used to noticeably reduce the momentum compaction.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.339279
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  • 3
    Digitale Medien
    Digitale Medien
    Bulk properties of composite media. I. Simplification of bounds on the shear modulus of suspensions of impenetrable spheres (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 3503-3513 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We study third-order upper and lower bounds on the shear modulus of a model composite made up of equisized, impenetrable spherical inclusions randomly distributed throughout a matrix phase. We determine greatly simplified expressions for the two key multidimensional cluster integrals (involving the three-point distribution function for one of the phases) arising in these bounds. These expressions are obtained by expanding the orientation-dependent terms in the integrand in spherical harmonics and employing the orthogonality property of this basis set. The resulting simplified integrals are in a form that makes them much easier to compute. The approach described here is quite general in the sense that it has application in cases where the spheres are permeable to one another (models of consolidated media such as sandstones and sintered materials) and to the determination of other bulk properties, such as the bulk modulus, thermal/electrical conductivity, and fluid permeability.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.339273
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  • 4
    Digitale Medien
    Digitale Medien
    Spectroscopy of 3-μm laser transitions in YAlO3:Er (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 3570-3572 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: YAlO3:Er laser crystals with medium dopant concentration can emit on different transitions of the 4I11/2→4I13/2 manifolds within a laser pulse. In a 20-at. % doped a rod the three most prominent laser lines oscillate at wavelengths of λ1=2.73 μm, λ2=2.79 μm, and λ3=2.92 μm. The temporal sequence of λ1, λ2, and λ3 within a train of relaxation oscillations has been measured and is analyzed on the basis of inversion, linewidth of transitions, and ion-ion interaction in the 4I13/2 state.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.339283
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  • 5
    Digitale Medien
    Digitale Medien
    Comparison between two models of nonlocal heat flux in laser-generated plasma (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 3592-3594 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Two models of nonlocal heat flux in laser-driven plasmas have been presented by Luciani and Mora, and by Albritton et al. The disagreement between them is shown to be only apparent: when used in exactly the same conditions, they actually give the same answer, provided that the correct tabulated propagator is used in the integral giving the flux. A steepening of the temperature profile at critical density still exists for both models.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.339287
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  • 6
    Digitale Medien
    Digitale Medien
    Novel microstructures for the in situ measurement of mechanical properties of thin films (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 3579-3584 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: This paper discusses microfabricated structures designed for the in situ measurement of the mechanical properties of thin films under residual tensile stress. The film is deposited and patterned on a (100) silicon substrate in which 5-μm-thick diaphragms have been fabricated. When the silicon diaphragm is etched from the backside in an SF6 plasma, the microstructures are released and deform under the residual tension. Measurement of this deformation in conjunction with appropriate mechanical models determines the mechanical properties of interest. We have used these structures to study benzophenonetetracarboxylicdianhidride-oxydianiline/metaphenylene-diamine polyimide films. Typical value for the residual stress to modulus ratio in this case was determined to be 0.011±0.001 while the ultimate strain at break was found to be 4.5% for 5.5-μm-thick films. For thicker films (8.5 μm), the film did not fail until 8% strain was reached.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.339285
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  • 7
    Digitale Medien
    Digitale Medien
    Electromagnetic wave generation utilizing plasma instabilities (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 3598-3604 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A new device for the production of microwave radiation is proposed. The device exploits the electromagnetic instabilities of nonequilibrium plasmas. The plasma parameters are chosen in such a way as to avoid electrostatic instabilities. The main advantage of the proposed device over other microwave production devices is that in the former case one can achieve very high-power densities in the active medium and utilize large volume of the same. This opens the way to the generation of much larger amounts of microwave power than before. A linear stability analysis of a homogeneous magnetized plasma having anisotropic velocity distribution shows that a plasma of volume 104 cm3 immersed in a magnetic field of 1 T and having parallel and perpendicular temperatures of 1 and 2 keV, respectively, is capable of emitting about 0.4 kJ of energy in microwave form in a time span of about 10−10 s.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.339262
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  • 8
    Digitale Medien
    Digitale Medien
    Operational characteristics of a gas discharge stabilized by a rotating magnetic field (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 3616-3620 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The operational characteristics of a gas discharge under the influence of a transverse rotating magnetic field are described. The terminal characteristics and measurements of gas-discharge temperature are presented. Experimental results indicate that a transverse rotating magnetic field can improve gas-discharge stability and useful power deposition into the plasma. A 25% increase in discharge power loading has been demonstrated by using this discharge-stabilization technique.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.339264
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  • 9
    Digitale Medien
    Digitale Medien
    Reversible structural relaxation in Fe-Ni-B-Si metallic glasses (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 3633-3638 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Reversible structural relaxation has been studied in (Fe1−xNix)80B10Si10 by differential scanning calorimetry and x-ray diffraction. It is found that surface crystallization plays a major role in inhibiting reversibility. In consequence, previously published data have presented a misleading picture about the composition dependence of the reversible effect in Fe-Ni-B-Si, which simply increases monotonically with Ni composition. There is no evidence that chemical short-range order plays any role in reversibility, and the data have been quantitatively modeled by simply assuming that reversible relaxation is caused by the thermal repopulation of excited structural states.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.339267
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  • 10
    Digitale Medien
    Digitale Medien
    Bending piezoelectricity in monomorph polymer films (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 3643-3646 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Studies with laser-induced pressure pulses show the existence of a piezoelectric monomorph polarization in 22–25-μm-thick PVDF films after irradiation with a 30-kV electron beam. The bending piezoelectric stress constant β31 and the tensile piezoelectric strain constant d31 were determined for such monomorph samples. Both β31 and d31 increase with increasing irradiation time and a linear relation between them is found. The highest values of β31 and d31 achieved are 90 nC/m and 3 pC/N, respectively. A theory is presented for a film with a step-shaped distribution of polarization along the thickness. A bending piezoelectric strain constant f31 is defined which relates the electric displacement to the stress gradient along the thickness. It is concluded that β31 is determined by the distribution of d31 and f31.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.339243
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