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  • 1
    Digitale Medien
    Digitale Medien
    The adsorption and thermal decomposition of formic acid on Si(100) and Si(111) surfaces (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 2712-2725 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: The adsorption of formic acid (HCOOH) on the Si(100)c(4×2), Si(100)(2×1), Si(100)9° vicinal and Si(111)(7×7) surfaces has been studied by means of high resolution electron energy loss spectroscopy. Formic acid is partially dissociated to form the unidentate formate species (HCOO) and H adatoms on these surfaces at both 90 and 300 K. The formate species is bonded to the Si surface with a covalent bond formed between one of its oxygen atoms and the dangling bond of the surface Si atom. A condensed multilayer of molecular formic acid is formed after the Si surface is saturated with the formate species at 90–150 K. The thermal decomposition mechanism has been studied in detail. The decomposition temperatures of the formate species on Si(100) and Si(111) are ∼600 and 550 K, respectively. It appears that the surface steps do not play an important role in the Si–HCOOH interaction. As the formate-covered surface is exposed to atomic hydrogen, methylendiolate (H2COO) is formed on the Si surface.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.456981
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  • 2
    Digitale Medien
    Digitale Medien
    Selective metallization of n-type GaAs formed by projection-patterned excimer laser doping of Si (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 619-621 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Resistless microfabrication of the metallization of n-type GaAs formed by projection-patterned doping using a KrF excimer laser is described. Silane (SiH4 ) gas is used as a source material of the n-type dopant of Si. Copper thin films with a linewidth as narrow as 3.4 μm are deposited selectively on the doped region by electroplating using a CuSO4 aqueous solution. Using the selective metallization process, nonalloyed ohmic contacts can be formed with a specific contact resistance of 2.32×10−5 Ω cm2, which is one-thirtieth of that of the conventional alloyed contacts.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.101828
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  • 3
    Digitale Medien
    Digitale Medien
    High transition temperature superconductor LaBa2Cu3O7−y with zero resistance at 92 K (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 52 (1988), S. 1989-1991 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Samples of LaBa2 Cu3 O7−y have been synthesized, which show a superconducting transition above 90 K. One of the samples shows a superconducting transition with an onset at 93 K and a zero resistivity at 92 K. These temperatures are the highest among those reported so far on this system and even higher than those in YBa2 Cu3 O7−y. The magnetic susceptibility measurement also shows that it has a superconducting transition with onset at around 93 K. To synthesize such good LaBa2 Cu3 O7−y requires two important procedures. First is sintering above 950 °C in N2 gas atmosphere and the second is annealing at 300 °C in dried O2 gas atmosphere.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.99744
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  • 4
    Digitale Medien
    Digitale Medien
    3D computer simulation of the primary electron orbits in a magnetic multipole plasma source (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 1323-1328 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Performance characteristics of the magnetic multipole plasma source depend strongly on the structure of the line-cusp magnetic fields and the behavior of the primary electrons. In order to design and improve the plasma source efficiently, we developed a computer code which can simulate primary electron orbits in the three-dimensional magnetic field generated in the source. Using this code, we compared the orbits of the primary electrons in the arc discharges with and without the mode-flip phenomenon. The result indicates that the trapping of the primary electrons in a local magnetic mirror fields causes the mode flip due to the reduction of the effective anode area. Trapping also degrades the spatial uniformity of the source plasma density, due to local arc discharge. The structure of the magnetic field can be optimized so that the primary electrons fill the center region of the source. The 3D simulation of the electron orbits turned out to be effective and useful in designing a multipole source.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.338110
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  • 5
    Digitale Medien
    Digitale Medien
    Study on the preparation of 90-K superconductor LaBa2Cu3Oy (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 4095-4102 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The high-Tc superconductor LaBa2Cu3Oy has been prepared under various conditions, and characterized by x-ray and neutron powder diffraction techniques, dc and ac magnetic susceptibility measurements, and dc resistivity measurement. It has been found that samples with excellent superconducting characteristics and also with good structural properties are obtained in a reproducible way if the following three procedures are performed: preheat treatment of La2O3 powders, sintering in N2, and low-temperature annealing in dried O2. Long-time annealing in undried O2 was sometimes found to degrade the grain boundaries and to lead to a lower zero-resistance temperature.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.341318
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  • 6
    Digitale Medien
    Digitale Medien
    The effect of lanthanide substitution on the superconductivity in Ba2YCu3O7 and (La,Sr)2CuO4 (invited) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 4009-4014 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The effect of the lanthanide substitution on the superconductivity in Ba2YCu3O7 and (La,Sr)2CuO4 is investigated. The substitution effect is completely different between the two Cu-oxide systems. In Ba2YCu3O7, the replacement of Y with lanthanides gives negligible change in the transition temperature, whereas a few percent of lanthanide substitution depresses Tc by about 10 K in the (La,Sr)2CuO4 system. The depression of Tc in the latter system depends on the atomic number of lanthanides. From the results of the magnetic susceptibility and the relationship between the lattice parameters and Tc , we conclude that the depression of Tc cannot be ascribed to the magnetic effect nor to the volume effect. Possible mechanisms for the depression of Tc are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.340583
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  • 7
    Digitale Medien
    Digitale Medien
    High-pressure generation by a multiple anvil system with sintered diamond anvils (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 922-925 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: High-pressure experiments using a multiple anvil high-pressure system with sintered diamond anvils are presented and discussed. Pressures in excess of 41 GPa were obtained, on the basis of the lattice constants of gold determined by the in situ x-ray diffraction technique using synchrotron radiation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1140344
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  • 8
    Digitale Medien
    Digitale Medien
    Steady-state discharge test of coaxial LaB6 cathode (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 120-124 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Results of steady-state discharge test of coaxial LaB6 cathodes in a multicusp plasma generator are described. After a single-unit test of a compact, 6.4-mm-diam coaxial LaB6 cathode, a discharge test of two cathodes with one heater power supply was carried out with success. In addition, a new tapered coaxial cathode, which was designed to prevent overheating of LaB6 due to ohmic heating by discharge current, was investigated. During steady-state plasma source operation, a discharge current as high as 180 A was obtained with this tapered cathode.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1139998
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  • 9
    Digitale Medien
    Digitale Medien
    Vibrational electron energy loss spectroscopy of the Si(111)(7×7)–H2O(D2O) system (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 84 (1986), S. 6458-6465 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: High-resolution electron energy loss spectroscopy (EELS) has been applied to the study of the Si(111)(7×7)–H2O(D2O) system. At 300 K, H2O(D2O) is partially dissociated on the Si(111) surface to form the SiOH(SiOD) and SiH(SiD) species. Angle and primary-electron-energy dependences of the vibrational loss intensities were measured. Relative contributions to the vibrational excitations of the dipole, impact, and resonance mechanisms were estimated. The O–H(O–D) stretching and Si–O–H (Si–O–D) bending vibrations are partly excited by the resonance mechanism in the primary energy region of Ep (approximately-equal-to)2–7 eV. EELS spectra of the Si(111) surface exposed to H2O(D2O) at 300 K and of the same surface heated to ∼700–900 K are presented, and surface reaction mechanisms are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.450741
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  • 10
    Digitale Medien
    Digitale Medien
    Henneguya pagri n. sp. (Myxozoa: Myxosporea) causing cardiac henneguyosis in red sea bream, Pagrus major (Temminck & Schlegel) (2005)
    Oxford, UK : Blackwell Science Ltd
    Journal of fish diseases 28 (2005), S. 0 
    Details
    ISSN: 1365-2761
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie , Medizin
    Notizen: Henneguya pagri n. sp. (Myxozoa: Myxosporea) is described from netpen-cultured red sea bream, Pagrus major, in Japan. Affected fish displayed anaemic gills, an enlarged bulbus arteriosus and internal haemorrhaging in the pericardial cavity. Disease outbreaks occurred during the summer and the prevalence of infection reached 75% in August. Plasmodia of H. pagri developed in the bulbus arteriosus of red sea bream, in which degenerative cardiomyopathy was observed. Following maturation of the parasite, the influx of spores into the gills caused congestion of the gill capillaries, resulting in proliferative branchitis. Spores (10.5 × 7.5 μm) were ovoid with two caudal appendages (29.6 μm in average length), with a whip-like extension from the end. Partial small subunit ribosomal RNA gene sequences of H. pagri are closely related to those of H. lateolabracis infecting the bulbus arteriosus of Chinese sea bass, Lateolabrax sp.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2761.2005.00655.x
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