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  • 1990-1994  (11)
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  • 1
    Electronic Resource
    Electronic Resource
    Coercivity mechanism of sintered NdFeB magnets having high coercivities (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4750-4752 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The combination of some additions and substitutions to sintered Nd-Fe-B magnets was investigated in order to obtain high coercivity and good thermal stability. Some additions (Al,Ga,Nb,W) and a substitution (Dy for Nd) give Nd-Fe-B-based sintered magnets high coercivities without a large remanence loss. Small differences in the amount of additions (Nd,Dy)-Fe-(Al,Ga)-(Nb,W)-B for sintered magnets show no significant difference in magnetic hysteresis loops at room temperature. Those magnet alloys also have similar good thermal stability. Effects of additions in the high-coercivity materials are studied by measuring coercivities and anisotropy fields as a function of temperature. The small amount of additions (Nb,W) affects the large influence to the coercivity mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344800
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  • 2
    Electronic Resource
    Electronic Resource
    High-concentration Ce doping at n- and p-type Al/GaAs Schottky barrier interfaces (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 2403-2405 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Al/GaAs Schottky barriers are fabricated with 2.5–20-A(ring) thick doping layers of Ce of concentrations 1020 cm−3 and 1021 cm−3 situated below the GaAs surface. Schottky barrier heights (SBHs) are determined from current- and capacitance-voltage measurements. n-type SBHs decrease with increasing Ce doping layer thickness, while p-type SBHs increase, but to a lesser degree. A cross-sectional image taken by high-resolution transmission electron microscopy shows that Ce is located in the substitutional sites of the doping layers. The changes in the SBHs are attributed to strain induced by Ce atoms in the substitutional sites. The difference in the magnitudes of change observed for n- and p-type SBHs is discussed in relation to the inhomogeneity observed in the density of Ce atoms at the interface regions.〈pc;normal〉
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.106029
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  • 3
    Electronic Resource
    Electronic Resource
    Single-crystal Al growth on Si(111) by low-temperature molecular beam epitaxy (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 1751-1753 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Al films were formed by low temperature molecular beam epitaxy on Si(111) surfaces. The substrates were pretreated in a NH4F solution to obtain a nearly atomically flat surface by anisotropic etching. Planview transmission electron microscopy observation demonstrates that single-crystal Al films are successfully grown on the 7×7 surface structure. Such single-crystal growth is arrested on a disordered or hydrogen-terminated surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.109595
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  • 4
    Electronic Resource
    Electronic Resource
    Schottky barrier inhomogeneity caused by grain boundaries in epitaxial Al film formed on Si(111) (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 61 (1992), S. 1057-1059 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Epitaxial Al contacts on Si(111) are fabricated by electron beam evaporation at various substrate temperatures around 250 °C. They are observed by high-resolution transmission electron microscopy. Schottky barrier heights (SBHs) of the contacts are measured using current-voltage and capacitance-voltage methods. In the case of single-crystalline Al film, the SBH does not change and its spatial distribution remains homogeneous up to an annealing temperature of 550 °C. In contrast with this, for an epitaxial Al film containing grain boundaries, the spatial distribution of the SBH becomes inhomogeneous above 400 °C. This is attributed to Si diffusion along the grain boundaries in the Al film.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.107715
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  • 5
    Electronic Resource
    Electronic Resource
    Identification of an imprinted U2af binding protein related sequence on mouse chromosome 11 using the RLGS method (1994)
    [s.l.] : Nature Publishing Group
    Nature genetics 6 (1994), S. 33-40 
    Details
    ISSN: 1546-1718
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] A new imprinted gene has been discovered in mice using the technique of restriction landmark genomic scanning (RGLS) with methylation sensitive enzymes. Eight out of 3,100 strain–specific Notl and BssHII spots were identified as imprinted in reciprocal F1 hybrids. Subsequently, we isolated a ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/ng0194-33
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  • 6
    Electronic Resource
    Electronic Resource
    Unusual blink reflex with four components in a patient with periodic ataxia (1990)
    Springer
    Journal of neurology 237 (1990), S. 313-315 
    Details
    ISSN: 1432-1459
    Keywords: Blink reflex ; R2 response ; Periodic ataxia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Characteristic findings in blink reflex are reported in a 55-year-old female with periodic ataxia. The blink reflexes on the side ipsilateral to the stimulation consisted of four components with latencies of 11, 21, 35 and 47 ms, instead of the usual two components seen in normal subjects. On the contralateral side, the last three components were also present. The second component was different from the normal R2 response in that its latency was shorter than normal and it did not habituate by stimulation at a rate of 10 Hz. In addition, it was more affected by diazepam than the third or fourth components. It is considered that R2 may have consisted of three components and that a shorter latency of the second component could be explained by facilitation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00314750
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  • 7
    Electronic Resource
    Electronic Resource
    Plutonium isotopes in the surface air in Japan: Effect of Chernobyl accident (1990)
    Springer
    Journal of radioanalytical and nuclear chemistry 138 (1990), S. 127-138 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Plutonium isotope concentrations in the surface air at Tsukuba, Japan are reported during the period from 1981 to the end of 1986. The239,240Pu concentration in the surface air, which showed a marked seasonal variation with a spring maximum and fall minimum, decreased until the end of 1985 according to the stratospheric residence time of 1.15 years. In May 1986, elevated239,240Pu concentrations with high238Pu/239,240Pu activity ratios were observed. The serial trend of plutonium concentration in the surface air is similar to the concentrations of the Chernobyl-released radionuclides. These findings suggest that a significant part of the plutonium in the surface air in May 1986 was due to the Chernobyl fallout. The size distribution of plutonium bearing particles indicates that plutonium isotopes were mechanically released in the Chernobyl accident. The surface air concentration of plutonium from the Chernobyl accident was much lower than the concentrations of the volatile fission products, and increased the monthly mean239,240Pu concentration by only 0.03 μBqm−3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02049355
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  • 8
    Electronic Resource
    Electronic Resource
    Chemical speciation of particulate uranium in seawater (1991)
    Springer
    Journal of radioanalytical and nuclear chemistry 149 (1991), S. 83-96 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Uranium shows relatively conservative behaviour in seawater because of the formation of stable carbonato complexes, whereas particulate uranium, involved in suspended particles with the particle size of more than 0.45 μm, is a minor constituent. It was found that particulate uranium, with a range from 0.24 to 39 μBq·1−1, varies spatially and temporally. Its highest concentration occurs in the tropical region of the western North Pacific during the winter of 1983, corresponding to the 1983 El Nifio event. A leaching experiment revealed that major species of particulate uranium are “labile” organic complexes. Mass balance considerations suggest that particulate uranium in open ocean waters correlates with the presence of particulate organic matter (POM). A high peak of particulate uranium in 1983 may indicate that POM, i.e., primary productivity, increased in the western tropical Pacific during the El Niño event.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02053716
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  • 9
    Electronic Resource
    Electronic Resource
    Deposition of90Sr and plutonium isotopes derived from the Chernobyl accident in Japan (1994)
    Springer
    Journal of radioanalytical and nuclear chemistry 182 (1994), S. 349-358 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract To clarify environmental effects of the Chemobyl radionuclides, long-lived Chernobyl radioactivity (239,240Pu,238Pu,241Pu and90Sr) in deposition samples in May 1986 was measured at 11 stations in Japan. Temporal variation of weekly deposition of90Sr differed from that of volatile radionuclides such as131I and137Cs, which may reflect the released process at Chernobyl. On the other hand, the geographical distributions of the monthly deposition of long-lived radionuclides were similar to those of volatile radionuclides, in which maximum deposits of90Sr and plutonium were observed in Akita, a northwestern Japan Sea coast site of Honshu Island. Higher241Pu deposition in most of the stations, as well as high238Pu/239,240Pu activity ratios were observed. The241Pu/238Pu activity ratios in deposition samples were nearly equal to that in the total release, which is clear evidence that Chernobyl-derived plutonium was transported to Japan in May 1986 together with volatile radionuclides although the contribution of Chernobyl Pu was about three orders of magnitude lower than137Cs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02037511
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  • 10
    Electronic Resource
    Electronic Resource
    Plutonium and cesium isotopes in river waters in Japan (1990)
    Springer
    Journal of radioanalytical and nuclear chemistry 141 (1990), S. 191-202 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Concentrations of cesium isotopes and plutonium in river water samples in Japan, collected during the period from June 1985 to February 1987, have been measured. The total137Cs concentrations in the Japanese river waters ranged from 0.063 to 1.89 mBq·l−1. The portion of particulate137Cs to total was observed to be less than 10 to 35%. The total239,240Pu concentrations ranged from 0.56 to 1.93 μBq·l−1. Particulate239,240Pu occupied 13 to 95% of the total. After the Chernobyl fallout, elevated137Cs concentrations were observed in the Japanese river waters as well as the detection of134Cs, whereas there was no effect on the river plutonium from the Chernobyl fallout. The partition coefficients of137Cs and plutonium between suspended particulate and dissolved phases in the Japanese rivers were determined: from 1.0·104 to 3.2·105 and from 4.1·104 to 2.3·106 for137Cs and plutonium, respectively. The result suggests that these radionuclides, especially plutonium, are tightly associated with soil particles and/or suspended matter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02060198
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