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  • 1
    Electronic Resource
    Electronic Resource
    Hg incorporation in CdTe during the growth of HgTe-CdTe superlattices by molecular beam epitaxy (1987)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 51 (1987), S. 1545-1547 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: HgTe-CdTe superlattices and other microstructures such as single and double barrier tunneling structures are commonly grown by molecular beam epitaxy with the mercury flux continuously on the sample during the growth. This means that some mercury will be incorporated in the CdTe layers. We present here, for the first time, a measurement of the amount of mercury incorporated in thin layers of CdTe. X-ray photoelectron spectroscopy was used to measure the amount of mercury. The amount of mercury was found to be between 3 and 9% for CdTe (111)B, depending on the growth conditions. The amount of mercury was found to increase with mercury flux and to decrease as the substrate temperature was increased. Under the same conditions, it was found that much more mercury was incorporated in the (100) orientation. The type of substrate (CdTe or GaAs) was not found to influence the results. These results indicate that the amount of mercury in the CdTe layers of HgTe-CdTe superlattices is not quite as low as expected from measurements of thick CdTe layers, but it can be low enough that it does not influence significantly the results on the superlattice system in the (111) orientation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.98630
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  • 2
    Electronic Resource
    Electronic Resource
    Electrical properties of Li-doped Hg1−xCdxTe(100) by molecular beam epitaxy (1987)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 51 (1987), S. 2025-2027 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: p-type doping of HgCdTe(100) layers with lithium during growth by molecular beam epitaxy is reported. Hall measurements have been performed on these layers between 300 and 30 K. The Li concentration is found to increase with the Li cell temperature. Li-doped HgCdTe layers are estimated to have very shallow acceptor levels. Acceptor concentrations as high as 8×1018 cm−3 have been achieved. At low doping levels, due to residual donors, layers show compensation. Incorporation coefficient of Li close to 1 and almost 100% electrical efficiency for Li in molecular beam epitaxy HgCdTe layers were observed. However, Li is found to diffuse rapidly in HgCdTe layers grown by molecular beam epitaxy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.98281
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  • 3
    Electronic Resource
    Electronic Resource
    Electron microdiffraction studies of new SiO2 precipitates in silicon (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 419-422 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Coherent electron microdiffraction patterns have been obtained from a new crystalline precipitate found in silicon wafers annealed at 635 °C for 256 h. On the basis of the experimental evidence presented, the most likely structure is that of keatite (SiO2, tetragonal). The implications for the study of oxygen precipitation in silicon are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339814
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  • 4
    Electronic Resource
    Electronic Resource
    Cylindrical group and massless particles (1987)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 28 (1987), S. 1175-1179 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: It is shown that the representation of the E(2)-like little group for photons can be reduced to the coordinate transformation matrix of the cylindrical group, which describes movement of a point on a cylindrical surface. The cylindrical group is isomorphic to the two-dimensional Euclidean group. As in the case of E(2), the cylindrical group can be regarded as a contraction of the three-dimensional rotation group. It is pointed out that the E(2)-like little group is the Lorentz-boosted O(3)-like little group for massive particles in the infinite-momentum/zero-mass limit. This limiting process is shown to be identical to that of the contraction of O(3) to the cylindrical group. Gauge transformations for free massless particles can thus be regarded as Lorentz-boosted rotations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.527824
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  • 5
    Electronic Resource
    Electronic Resource
    Decomposition of Lorentz transformations (1987)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 28 (1987), S. 2373-2378 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: It is shown that every Lorentz transformation can be decomposed into a helicity-preserving transformation that changes the momentum of a free particle and a helicity-changing transformation that leaves the momentum invariant. Since momentum-preserving transformations constitute a subgroup of the Lorentz group, helicity-preserving transformations form a coset space. It is shown further that, for massive particles, every Lorentz transformation can be decomposed into the Wigner rotation and helicity-preserving transformations. For massless particles, every Lorentz transformation can be decomposed into the gauge transformation and helicity-preserving transformation. The gauge transformation in this case is a Lorentz-boosted Wigner rotation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.527773
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  • 6
    Electronic Resource
    Electronic Resource
    Automated ion-exchange column system for biological sample fractionation (1987)
    s.l. : American Chemical Society
    Analytical chemistry 59 (1987), S. 687-688 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00131a033
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  • 7
    Electronic Resource
    Electronic Resource
    Effects of viscosity on plasma equilibria (1987)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 30 (1987), S. 2905-2907 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High-beta large ion-gyroradius plasmas in the University of Wisconsin Octupole [Phys. Rev. Lett. 46, 1394 (1981)] exhibited an anomalous diamagnetism that is smaller than the prediction from ideal magnetohydrodynamic (MHD) theory by a factor of up to 5. The effects of viscosity on the equilibrium diamagnetism are presented and shown to be qualitatively consistent with the experimental results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866029
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  • 8
    Electronic Resource
    Electronic Resource
    Expression of epithelial markers in sarcomatoid carcinoma: an immunohistochemical study (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Histopathology 11 (1987), S. 0 
    Details
    ISSN: 1365-2559
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Thirty-four cases of sarcomatoid carcinoma with minimal epithelial components (SC) and six cases of sarcomatous tumour without any epithelial component (ST) in various organs were studied by the immunoperoxidase technique for the expression of epithelial markers, cytokeratins and epithelial membrane antigen (EMA). Employing antibodies against both high and low molecular weight cytokeratins, sarcomatoid components in 30 examples of SC were stained positively. Epithelial membrane antigen was demonstrated in 19 out of 34 SC. The positive cells for epithelial markers within sarcomatoid components in some cases of SC, which were regarded as originating from squamous cell carcinoma, tended to be seen less frequently than in the tumours derived from adenocarcinoma or transitional cell carcinoma. In six cases of ST, stain for EMA was negative and stain for cytokeratins was positive in three examples. The immunohistochemical examination of epithelial markers in the tumours of these types may be of value in differentiating these tumours from true sarcomas.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2559.1987.tb02659.x
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  • 9
    Electronic Resource
    Electronic Resource
    Conditioned Suppression of Plaque-Forming Cell Responses with Cyclophosphamide. The Role of Taste Aversion (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 496 (1987), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1987.tb35818.x
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  • 10
    Electronic Resource
    Electronic Resource
    New cavity-mode model for the dynamic Josephson tunneling states (1987)
    Springer
    Journal of low temperature physics 68 (1987), S. 205-211 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A modified Fiske step model for Josephson tunneling states that includes a spatial variation of the dc Josephson current is studied. This spatial variation is due to the external current injected from the junction edges. The new model can explain both the Fiske step and zero-field current step (ZFCS) on an equal footing and can account for the symmetric mode recently obtained by one of the present authors (Chang) and his co-workers using computer simulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00683899
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