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  • 1985-1989  (20)
Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Insectes sociaux 36 (1989), S. 277-292 
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Eine obligatorisch monogyne und eine fakultativ polygyne Form vonCamponotus nawai Ito wurden vergleichen. Jahreszeitliche Veränderungen der Koloniezusammensetzung waren bei beiden Formen ähnlich, abgesehen von der Zeit, in der geflügelte Geschlechtstiere in den Nestern zu finden sind. Die Sammelergebnisse lassen annehmen, daß bei der monogynen Form neue Kolonien nur von einzelnen Königinnen gegründet werden, während sie bei der polygynen Form durch Kolonieteilung entstehen. In polygynen Völkern waren alle oder fast alle Königinnen fertil, sa daß eine funktionelle Polygynie vorliegt. Königinnen der monogynen Form sind größer und haben größere Ovarien. Die Königinnen der polygynen Form zeigen eine bimodale Grossen-verteilung doch sind die kleineren Königinnen seltener. Bei der polygynen Form war die Anzahl der Königinnen mit der Menge der Brutstadien positiv korreliert, aber negativ mit der Menge der Brustadien pro Königin. Anscheinend besiedelt die polygyne Form mehr nördliche Gebiete als die monogyne, ihre Areale überschneiden sich kaum. Aufgrund der jahreszeitlich verschiedenen Schwarmzeiten sind die monogyne und die polygyne Form vonC. nawai möglicherweise zwei verschiedene Arten.
    Notes: Summary Obligately monogynous and facultatively polygynous forms ofCamponotus nawai Ito was compared. The seasonal changes of colony composition were similar in the two forms except for the season in which alates were found in nests. Collection data suggested that new colonies are founded only by single foundresses in the monogynous form, but mainly by colony budding in the polygynous form. All or most queens in polygynous nests were fertile, thus polygyny is functional. The body size and ovarian volume of queens were larger in the monogynous forms. Queens of the polygynous form showed bimodal size distribution, though smaller queens were less frequent. In the polygynous form, the number of queens was positively correlated with the number of immatures, but negatively correlated with the number of immatures per queen. It seems that the polygynous form occupies more northern regions than the monogynous one and their ranges contact parapatrically. The monogynous and polygynous forms ofC. nawai may be different species because of the differing mating seasons.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of cutaneous pathology 16 (1989), S. 0 
    ISSN: 1600-0560
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: A new follicular cyst was reported. The lower part of the cyst wall was composed of both basophilic and shadow cells as seen in pilomatricoma, whereas the upper part of the wall consisted of clear cells. Our case apparently derives from hair matrix and outer root sheath.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 572-574 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Thin film with a high Tc single phase was prepared on a (100)MgO substrate at a substrate temperature of about 620 °C by coevaporation of Bi2O3, Sr, Ca, and Cu metal. The resistive superconducting transition with onset Tc of 80 K was observed for this film. By post-deposition annealing at 850 °C, the high Tc phase was transformed into a low Tc phase, while films annealed at a higher temperature such as 890 °C maintained the high Tc phase. These results indicated that the high Tc phase can exist only at the high-temperature region (∼890 °C) while the stable phase existing at the low-temperature region (∼850 °C) is the low Tc phase.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 1360-1362 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: As-grown crystallized Bi2Sr2Ca1Cu2Ox phase films were prepared on MgO(100) substrates by rf magnetron sputtering. The as-grown film showed the Tc onset of 92 K and the Tc end of 82 K. By annealing in the furnace at 480 °C after deposition, superconducting property and the c-axis lattice constant varied with atmosphere during annealing. The film after annealing in air at 480 °C exhibited the highest superconducting transition with the Tc onset of 93 K and the Tc end of 85 K. The Tc onset increased when the c-axis lattice constant was increased, suggesting that the Tc onset increases with decreasing the oxygen content of the film.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 1474-1476 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The as-grown crystallized films of low Tc phase (Tc∼80 K) in a Bi-Sr-Ca-Cu-O system were prepared by rf magnetron sputtering and were annealed in argon or oxygen atmosphere below 500 °C. Superconducting properties and the c-axis lattice constant varied according to the annealing temperature and atmosphere. These results suggest that the oxygen content in the film is varied by low-temperature annealing and that the variation of oxygen content affects the superconducting and structural properties. By cooling the sample in the chamber in 760 Torr oxygen, the as-grown film with Tc end at 74 K was obtained.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 1967-1969 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Epitaxial films of Y-Ba-Cu-O were obtained on a Si substrate, using an epitaxial intermediate layer consisting of BaTiO3(or SrTiO3)/MgAl2O4. MgAl2O4 was epitaxially grown on the Si(100) substrate by chemical vapor deposition. Then, SrTiO3 or BaTiO3 was also epitaxially grown on the MgAl2O4 layer by means of rf magnetron sputtering. Epitaxial Y-Ba-Cu-O films were prepared on BaTiO3(SrTiO3)/MgAl2O4/Si substrates by rf magnetron sputtering. Preparation of an Y-Ba-Cu-O film directly on MgAl2O4/Si was also studied, but only a randomly oriented polycrystalline film has been obtained so far. Resistive superconducting transitions with zero resistance at 65 K on SrTiO3/MgAl2O4/Si and at 70 K on BaTiO3/MgAl2O4/Si were observed.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 1292-1295 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Preferentially oriented epitaxial Y-Ba-Cu-O films were prepared on (100) SrTiO3 substrates by oxygen reactive ion beam sputtering. The epitaxial orientations were varied by controlling both substrate temperature and oxygen parital pressure. c-axis oriented films tended to be formed at higher substrate temperatures (〉620 °C) and lower oxygen pressures (〈3×10−3 Torr). In contrast, a/c- and a-axis oriented films were formed at lower substrate temperatures (〈600 °C) and higher oxygen pressures (〉3×10−3 Torr). The best Tc (end) of 82 K was observed in one of the c-axis oriented film without post-annealing. The tendency for preferential orientation can be well understood in terms of the lattice mismatch between the substrate and the film, the lattice constants of which depend on oxygen deficiency.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 3604-3604 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: SmCo film magnet has been synthesized on a heated substrate by means of rf sputtering. In Sm1−xCox (0.6≤x≤0.98) films the saturation magnetization simply decreases with the increase in Sm content, while the other magnetic properties strongly depend on the crystalline phases. The film with 1 μm in thickness and x∼0.8 mainly consists of SmCo5 phase, which exhibits in-plane anisotropy. The films with the easy axis perpendicular to the film surface are obtained in the composition around x=0.75. It is the mixture of amorphous and crystalline SmCo3 phases.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 53 (1988), S. 1213-1215 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Thin films of the Bi2(Sr1−xCax)n+1CunOy (n=2, 3) system were prepared on (100)MgO substrates by coevaporation of Bi2O3, Sr-Ca alloy, and Cu metal. The lattice constant of the c axis of the low Tc (∼85 K) phase (n=2) decreased with increasing Ca composition x. The superconducting transition temperatures of both the low Tc phase and high Tc (∼110 K) phase (n=3) decreased with increasing x. These tendencies indicated that both the low Tc phase and the high Tc phase have a mutual solubility between Ca and Sr atoms in this Bi system and that the Tc 's of these two phases are related to the c-axis lattice constant.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Type of Medium: Electronic Resource
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