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  • 1
    Electronic Resource
    Electronic Resource
    Effect of boron on the deep donors (DX centers) in GaAs:Si (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 1344-1346 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We found that, when boron was introduced into GaAs:Si, the deep donors induced by pressure exceeding 20 kbar reported previously by M. Mizuta, M. Tachikawa, H. Kukimoto, and S. Minomura [J. Appl. Phys. 24, L143 (1985)] disappeared while new donor levels with reduced binding energies and capture barrier heights appeared. It is proposed that B atoms paired up with Si donor atoms and the resultant change in the short-range potential of the Si donor atoms depressed the capture barrier height of the pressure-induced deep donor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100710
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  • 2
    Electronic Resource
    Electronic Resource
    Isolation of a picorna-like virus from smelt, Osmerus mordax (Mitchill) (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish diseases 11 (1988), S. 0 
    Details
    ISSN: 1365-2761
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2761.1988.tb00537.x
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  • 3
    Electronic Resource
    Electronic Resource
    Discovery of a new photoinduced electron trap state shallower than the DX center in Si doped AlxGa1−xAs (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 5632-5634 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have found a new electron trap state in Si-doped AlxGa1−xAs by deep level transient spectroscopy and constant temperature capacitance transient measurements under strong light illumination. This new trap is shallower than the DX center associated with Si impurity in that its emission and capture activation energies are equal to 0.20±0.05 and 0.17±0.05 eV, respectively. Its maximum concentration is comparable to the concentration of the DX center. Possible origins of this new trap and its relationship to the DX center are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343672
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  • 4
    Electronic Resource
    Electronic Resource
    Pressure dependence of Schottky barrier height at the Pt/GaAs interface (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 974-976 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The Schottky barrier height at the Pt/GaAs interface has been measured as a function of pressure using a diamond anvil cell. The Schottky barrier height was found to shift to higher energy with a linear pressure coefficient of 11 meV/kbar, which is equal to the pressure coefficient of the fundamental gap of GaAs and with a nonlinear coefficient of −0.26 meV/kbar2. These results are discussed in terms of defect models which have been proposed to explain the Fermi level pinning in Schottky barriers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100045
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  • 5
    Electronic Resource
    Electronic Resource
    Lattice relaxation of pressure-induced deep centers in GaAs:Si (1987)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 51 (1987), S. 349-351 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Deep centers induced by hydrostatic pressure in GaAs:Si have been studied by deep level transient spectroscopy and constant temperature capacitance transient techniques. The capture behavior of these centers has been studied in detail and found to be consistent with the multiphonon emission theory. The pressure coefficients of the ionization energy and the barrier height are consistent with the large lattice relaxation model proposed by D. V. Lang and R. A. Logan [Phys. Rev. Lett. 39, 635 (1977)].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.98437
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  • 6
    Electronic Resource
    Electronic Resource
    Pressure dependence of the DX center in Ga1−xAlxAs:Te in the vicinity of the Γ-X crossover (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 1195-1197 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The pressure dependence of the DX center in Ga1−xAlxAs :Te has been studied in two samples with x=0.15 and 0.35, respectively. The pressure coefficients of the activation energies for both emission and capture were found to change sign when the band gap of GaAlAs changes from direct to indirect. These results, together with previous experiments, suggested that electrons can be emitted from and capture into the DX centers via both L and X valleys.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.100017
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  • 7
    Electronic Resource
    Electronic Resource
    Detection of crystallization inhibitory activity of whole urine with a gel model (1987)
    Springer
    Urological research 15 (1987), S. 75-77 
    Details
    ISSN: 1434-0879
    Keywords: Gel model ; Calcium oxalate crystallization ; Inhibitory index
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The inhibitory activity of urine on calcium oxalate crystallization was measured as an inhibitory index using a gel model modified from Schneider et al. [8]. Urine samples from 36 recurrent stone formers and 21 controls in 3 separate periods (morning, afternoon and evening) were tested. Mean inhibitory indices of 〉0 were observed among normal controls in the 3 sampled periods and among stone formers in the morning and afternoon samples. A significantly lower (negative) value was observed in the evening samples of stone formers, indicating a higher tendency towards crystallization than normal. The gel method may be applied to identify individuals at risk of stone formation if sufficient numbers of period-defined urine samples from the individual are tested for a statistically significant mean inhibitory index but whether this is practical in a clinical laboratory will need further evaluations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00260936
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  • 8
    Electronic Resource
    Electronic Resource
    Vomiting in children following head injury (1987)
    Springer
    Child's nervous system 3 (1987), S. 266-270 
    Details
    ISSN: 1433-0350
    Keywords: Head injuries ; Vomiting ; Children
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The criteria for hospital admission of children who have suffered a minor head injury are highly subjective. Often the presence of post-traumatic emesis becomes an influential factor, but the mechanisms that trigger emesis following minor head injuries are not known. From a prospective study of 96 consecutive children with their first mild head injury (GCS 13–15) and a retrospective study of 29 consecutive more seriously injured children (GCS 8–12), we conclude that post-traumatic emesis is more common: (1) following minor head injuries than following more severe head injuries (P〈0.05); (2) in children over 2 years old; (P〈0.001); (3) in children injured within an hour of a meal or snack (p〈0.001). The presence of a skull fracture or the site of the impact does not influence the incidence or duration of post-traumatic emesis. Retching and vomiting generally subside within 3 h in children injured within an hour of a meal or snack. When vomiting appears in children injured more than an hour after a meal or a snack, it may be quite protracted (mean=7.5 h). Children over 2 years of age with post-traumatic emesis who are neurologically stable following a mild head injury that occurred within an hour of a meal or snack can be expected to improve quickly. Their counterparts injured more than an hour after a meal or snack are likely to remain distressed much longer and are best admitted to hospital.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00271820
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  • 9
    Electronic Resource
    Electronic Resource
    A simple method for characterizing the RF properties of high-temperature superconductive materials (1989)
    Springer
    International journal of infrared and millimeter waves 10 (1989), S. 1387-1400 
    Details
    ISSN: 1572-9559
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A simple method using a resonant strip in a rectangular waveguide has been devised for superconductive material characterization. The method has the advantages of simplicity; and it requires only a small piece of the superconductive material. The resonant frequency of the superconductive strip can be predicted theoretically.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01010130
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  • 10
    Electronic Resource
    Electronic Resource
    Structures and possible functions of epoxypukalide and pukalide (1989)
    Springer
    Journal of chemical ecology 15 (1989), S. 1177-1191 
    Details
    ISSN: 1573-1561
    Keywords: Sinularia spp. ; spawning ; soft coral ; pukalide ; epoxypukalide ; structure determination ; diterpene ; octocorals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Chemical analysis of the eggs spawned by fiveSinularia soft corals (Octocorallia, Alcyoniidae) collected in the central region of the Great Barrier Reef, Australia, revealed the presence of the known cembranoid diterpenes epoxypukalide and/or pukalide in all cases. Examination of the colonies from which the eggs were released one month before spawning and also some time after spawning failed to detect either diterpene in the coral tissue. The three dimensional structures of pukalide and epoxypukalide, as determined by the single-crystal X-ray technique, are reported for the first time. The wide distribution of pukalide and epoxypukalide and of related compounds within the octocorallia is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01014821
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