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  • Blackwell Publishing Ltd  (151)
  • American Institute of Physics (AIP)  (142)
  • 1990-1994  (283)
  • 1955-1959  (10)
  • 1
    Electronic Resource
    Electronic Resource
    Filtration Experiments of Henry Darcy (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 32 (1994), S. 0 
    Details
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6584.1994.tb00926.x
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  • 2
    Electronic Resource
    Electronic Resource
    Preparation of diamondlike carbon films by high-intensity pulsed-ion-beam deposition (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 5949-5954 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Diamondlike carbon (DLC) films were prepared by high-intensity pulsed-ion-beam ablation of graphite targets. A 350 keV, 35 kA, 400 ns beam, consisting primarily of hydrogen, carbon, and oxygen ions was focused onto a graphite target at a fluence of 15–45 J/cm2. Amorphous carbon films were deposited at up to 30 nm per pulse, corresponding to an instantaneous deposition rate greater than 1 mm/s. Electrical resistivities were between 1 and 1000 Ω cm. Raman spectra indicate that diamondlike carbon is present in most of the films. Electron-energy-loss spectroscopy indicates significant amounts of sp3-bonded carbon, consistent with the presence of DLC. Scanning electron microscopy showed most films contain 100 nm features, but micron size particles were deposited as well. Initial tests revealed favorable electron field-emission behavior.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358373
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  • 3
    Electronic Resource
    Electronic Resource
    New rare-earth intermetallic phases R3(Fe,M)29Xn: (R=Ce, Pr, Nd, Sm, Gd; M=Ti, V, Cr, Mn; and X=H, N, C) (invited) : The 6th joint magnetism and magnetic materials (MMM)-intermag conference (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 6138-6143 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: New rare-earth (R), iron-rich ternary intermetallic compounds of the form R3(Fe,M)29 with the monoclinic Nd3(Fe,Ti)29 structure (space group P21/c, #14, Z=2) have recently been shown to form with R=Ce, Nd, Pr, Sm, and Gd, and M=Ti, V, Cr, and Mn. This novel structure is derived from the alternate stacking of Th2Zn17 and ThMn12-type segments and contains two R sites and fifteen Fe(M) sites. Reported Curie temperatures of the 3:29 compounds range from 296 K (R=Ce, M=Cr) to 524 K (R=Sm, M=V). The 3:29 compounds all show improved magnetic properties after interstitial modification with H or N; in particular, room-temperature coercivity has been reported in Sm3(Fe,Ti)29N5, making this compound a candidate for possible permanent-magnet applications. In this article we will review the work carried out to date on the 3:29 compounds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358333
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  • 4
    Electronic Resource
    Electronic Resource
    Growth and structure of IrSi3 on Si(111) (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 2917-2923 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Molecular-beam epitaxy has been used to grow films that are almost entirely IrSi3 by codeposition of Si and Ir in a 3:1 ratio on Si(111) substrates. Bragg–Brentano and Seemann–Bohlin x-ray diffraction reveal that polycrystalline IrSi3 films form as low as 490 °C, the lowest temperature yet reported for growth of this iridium silicide phase. Above 580 °C this hexagonal phase becomes textured, with as many as seven preferred growth orientations on Si(111). Samples codeposited on Si(111) between 680 and 780 °C consist almost entirely of IrSi3 with its c axis perpendicular to the substrate's surface. At higher substrate temperatures, near 830 °C growth of IrSi3 with its c axis in the plane of the substrate dominates. Atomic force microscopy shows that there is a difference in the surface morphology of the c-axis in-plane and perpendicular growth modes. Transmission electron microscope diffraction and in situ low-energy electron diffraction verify that both of these IrSi3 growth modes are epitaxially registered with their substrates. To check the quality of this epitaxy ion-beam channeling and x-ray rocking curves were used. The data from the epitaxial samples have channeling χmin ratios as low as 0.64. The x-ray rocking curves for these IrSi3 films are narrow, with full-width-at- half-maxima of as little as 0.07°.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356185
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  • 5
    Electronic Resource
    Electronic Resource
    Re-emission of deuterium from graphite as a function of D+ flux density (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 4511-4515 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An experiment was performed in order to determine whether a first-order or second-order mechanism governs the re-emission of deuterium molecules from graphite during D+ bombardment. The order of the release mechanism should be reflected in the dependence of the re-emission on the incident flux density. No flux density dependence was observed, indicating a first-order process, in agreement with a hydrogen transport model where the rate of molecule release is determined by a first-order process involving H diffusion within graphite crystallites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357282
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  • 6
    Electronic Resource
    Electronic Resource
    Surface roughness effect on surface impedance of superconductors (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 3669-3672 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The measured values of microwave surface resistance and reactance of a superconductor have generally three contributions from (1) the intrinsic properties, (2) the internal defects, and (3) the external surface roughness. In this paper, we formulate the increased factor of surface resistance and reactance of superconductors using Morgan's square-grooves model and with the consideration that the current flows along the irregular surface. Numerical results obtained using a finite difference method are presented together with fitted closed-form formulas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357430
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  • 7
    Electronic Resource
    Electronic Resource
    Structural-modification mechanism for polyimide-doped poly(tetrafluoroethylene) at subthreshold fluences using 248 nm radiation (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 3049-3051 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Single-photon excimer laser ablation of neat poly(tetrafluoroethylene) (PTFE) is not observed at emissions in the "quartz'' UV, i.e., from about 190–380 nm. However, it has been successfully demonstrated that, when the fluoropolymer is doped with small quantities of polyimide (PI), ablation in the quartz UV, e.g., at 248 and 308 nm and pulse widths of about 25 ns, is readily achieved. When PI-PTFE blends are exposed to subthreshold fluences, considerable changes in surface topography occur although clearly defined structures, e.g., pits, are not formed. Using photoacoustic infrared spectroscopy to evaluate surface and bulk chemical changes to blends exposed to subthreshold excimer laser fluences, 〈100 mJ/cm2, it is shown that PI (1) is distributed throughout the bulk and resides at the surface and (2) is selectively absorbing the high-energy photons and as a result being preferentially removed from the surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357485
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  • 8
    Electronic Resource
    Electronic Resource
    Determination of ionization energies of the nitrogen donors in 6H-SiC by admittance spectroscopy (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 1956-1958 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The nitrogen donor levels have been studied by admittance spectroscopy between 20 and 200 K in Schottky barriers made on lightly n-type epitaxial 6H-SiC layers. Measurements at different frequencies yield different freezeout temperatures which in turn are used to determine the donor level energies. Two electron traps at Ec−0.082 eV and at Ec−0.140 eV were detected. These levels are associated with nitrogen, respectively, at the hexagonal sites for the former and at the cubic sites for the latter level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357655
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  • 9
    Electronic Resource
    Electronic Resource
    The density of reactive levels in NO2 unimolecular decomposition (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 4809-4818 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Laser induced fluorescence spectra of expansion-cooled NO2/Ne samples (1 and 2 K) are reported for transitions that originate from the lowest rovibronic levels and terminate on levels near D0. At 1 K, nearly all transitions originate from N‘=0. With the present resolution of 0.02 cm−1, the 1 K spectra are resolved rather well. The high density of transitions is due to couplings between rovibronic levels with different N and K quantum numbers and with electronic characters that borrow oscillator strength from bright B2 vibronic species of the mixed 2A1/2B2 electronic system. Just above reaction threshold, such rovibronic species comprise the manifold of levels sampled by optically prepared wave packets. However, at higher energies we argue that the density of B2 vibronic species is a more relevant parameter to describe the nature of unimolecular reactions. Nuances of the optical excitation process are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467403
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  • 10
    Electronic Resource
    Electronic Resource
    The inducible multipole solvation model: A new model for solvation effects on solute electrostatics (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 5149-5159 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A new approach to modeling the electrostatics of molecules in solution is presented, which is comparable in accuracy to finite-difference continuum models, yet is comparable in speed to polarizable in vacuo models. This is achieved by modeling the polarization charge resulting from solvation as inducible multipoles at the solute's atom centers. Pilot studies of small molecule solvation energies, and of pKa shifts and molecular fields in proteins are presented. The results compare favorably with the finite-difference results while requiring significantly shorter execution time. Bearing in mind that no parameter optimization was performed in this study and that nonelectrostatic energy contributions were not considered, the results also compare reasonably with experimental results where those are available.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467179
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