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  • 2000-2004  (77)
  • 1995-1999  (64)
  • 1960-1964  (9)
  • 1925-1929  (5)
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  • 1
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    Submillimeter-wave phonon modes in DNA macromolecules (2002)
    American Physical Society
    Details
    Publication Date: 2002-05-03
    Print ISSN: 1063-651X
    Electronic ISSN: 1095-3787
    Topics: Physics
    Published by American Physical Society
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    PAPER CURRENT
  • 2
    Electronic Resource
    Electronic Resource
    Optical properties of InAlGaAs quantum wells: Influence of segregation and band bowing (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 2584-2589 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Knowledge of the quaternary InAlGaAs material system is very limited for the composition range relevant for growth on GaAs substrates. We report on the characterization and modeling of InAlGaAs quantum wells with AlGaAs barriers, grown pseudomorphically on a GaAs substrate with molecular beam epitaxy. The quantum wells are characterized with photoluminescence, and the measured transition energies are modeled taking into account the influence of In segregation on the shape of the well potential. From the modeling we deduce a relation for the low temperature band gap of unstrained Inx(AlyGa1−y)1−xAs, for 0≤x,y≤0.20. The measured linewidths of the luminescence peaks are in agreement with the broadening expected from random alloy fluctuations and well width fluctuations with an effective interface roughness of 1.1 ML. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.371096
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  • 3
    Electronic Resource
    Electronic Resource
    Maximally efficient permanent magnet structures (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 1157-1163 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A general theory is developed for determining the most efficient magnetic structure that generates a specified magnetic field. The structure is assumed to be composed of linear, isotropic magnetized material, occupying a given geometrical region. The efficiency is quantified by a figure of merit defined as the external field energy produced by the magnet divided by the maximum amount of energy that can be stored by the magnetized material. A set of equations is derived that determines the distribution of remanence needed to maximize this figure of merit, and several theorems concerning maximally efficient structures are given. Simple two-dimensional examples are used to illustrate the theory. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360914
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  • 4
    Electronic Resource
    Electronic Resource
    Erratum: "Maximally efficient permanent magnet structures'' [J. Appl. Phys. 79, 1157 (1996)] (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 1941-1941 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.363831
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  • 5
    Electronic Resource
    Electronic Resource
    Hybrid pole pieces for permanent magnets : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5199-5201 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Highly uniform magnetic fields for nuclear-magnetic-resonance imaging require accurate design of the pole pieces of a permanent magnet structure. We present a mathematical theory of pole pieces viewed as filters that eliminate selected harmonics of an expansion of the field distortion. Previous work has discussed two types of filters: active pole pieces and passive pole pieces. These are reviewed and a third type of filter, the hybrid pole piece, is introduced. The hybrid pole piece provides distinct advantages by combining features of both active and passive pole pieces. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361339
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  • 6
    Electronic Resource
    Electronic Resource
    Conductance quantization above 30 K in GaAlAs shallow-etched quantum point contacts smoothly joined to the background 2DEG (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 607-609 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The electrical characteristics of shallow etched GaAs/GaAlAs quantum point contacts (QPCs) of various shapes have been studied as a function of temperature above 0.3 K. Quantized conductance was observed up to 36 K, and from the temperature dependence of the conductance staircase we find energy separations between the lowest one-dimensional subbands up to 20 meV. This value exceeds the highest values so far reported for laterel QPC constrictions in GaAs/GaAlAs heterostructures. In addition, very well behaved quantized conductance plateaus were observed at the lowest temperatures. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.366724
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  • 7
    Electronic Resource
    Electronic Resource
    Restructuring Appalachian Manufacturing in 1963–1992: The Role of Branch Plants (2001)
    Oxford, UK and Boston, USA : Blackwell Publishers Ltd.
    Growth and change 32 (2001), S. 0 
    Details
    ISSN: 1468-2257
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography , Economics
    Notes: This paper uses the Longitudinal Research Database (LRD),a unique, detailed, plant-level database that covers the entire U.S. manufacturing sector in five-year intervals to examine how the manufacturing sector in Appalachia has evolved over the past thirty years (from 1963 to 1992). The research focuses on three questions:1) Is the Appalachian Region attracting new manufacturing plants at the same rate as the rest of the country? 2) Does Appalachian manufacturing employment exhibit low wage, low productivity characteristics, compared with the rest of the country? 3) Is Appalachia still heavily reliant on branch plants? The results show the manufacturing base of Appalachia in 1992 looks very much the same as it did in 1967. Compared to the rest of the country, Appalachian manufacturing is still more reliant on branch plants and is characterized by lower wage and lower productivity establishments. This result is not due to a lack of entry—manufacturing plant entry rates and manufacturing job formation associated with entrants in Appalachia are only slightly lower than for the U.S. as a whole. Job destruction rates caused by exits are actually lower than in the U.S. as a whole.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/0017-4815.00160
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  • 8
    Electronic Resource
    Electronic Resource
    Ultranarrow polaritons in a semiconductor microcavity (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 76 (2000), S. 3262-3264 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have achieved a record high ratio (19) of the Rabi splitting (3.6 meV) to the polariton linewidth (190 μeV), in a semiconductor λ microcavity with a single 25 nm GaAs quantum well at the antinode. The narrow polariton lines are obtained with a special cavity design which reduces the exciton broadening due to scattering with free charges and has a very low spatial gradient of the cavity resonance energy. Since the static quantum-well disorder is very small, the polariton broadening is dominantly homogeneous. Still, the measured linewidths close to zero detuning cannot be correctly predicted using the linewidth averaging model. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.126601
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  • 9
    Electronic Resource
    Electronic Resource
    Evaluating catches of salmonids taken by gillnets (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 46 (1995), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Data from 10 185 gillnetted brown trout (Salmo trutta L.) and 5777 Arctic charr [Salvelinus alpinus (L.)] were analysed. Relative to mesh size, the most efficiently caught fish length (the modal length) was somewhat larger with floated nets than with smaller nets placed on the bottom. There were no such consistent differences between the two species. Fish that exceeded the modal lengths were caught more efficiently than smaller fish. The relationship of most efficient mesh size to fish length and condition factor fitted excellently to a linear equation. Based on this equation, the selectivity curve for Arctic charr gillnetted in the Nesjø reservoir, the different efficiency of nets of 0.1 and 0.17mm twine and an equation expressing the increasing height of the selectivity curve with increasing mesh size, a model is presented to compare length frequencies and total numbers of gillnet catches taken with any combination of mesh sizes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1995.tb01609.x
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  • 10
    Electronic Resource
    Electronic Resource
    A direct estimate of gillnet selectivity for brown trout (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 46 (1995), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Five hundred pre-measured brown trout (Salmo trutta), 20 of each cm-class from 5 to 29 inclusive, were released. They were recaptured with gillnets of mesh size 8.0, 10.5, 16.0, 19.5 and 24.0 mm, measured between adjacent knots. The nets were made of clear, nylon monofilament. The modal lengths and the general shape of the selectivity curves were in agreement with earlier findings. The height of the selectivity curve (S) increased exponentially with mesh size in mm (M): S= 0.047e0.075M.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1995.tb01608.x
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