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  • 1
    Electronic Resource
    Electronic Resource
    Al concentration control of epitaxial AlGaN alloys and interface control of GaN/AlGaN quantum well structures (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 172-176 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: AlxGa1−xN alloys were grown by metalorganic chemical vapor deposition on c-plane sapphire substrates under various growth conditions. Both the Al concentration and the growth rate of AlGaN are strongly affected by gas-phase parasitic reaction between ammonia and group-III sources. As the ammonia flow rate increases with fixed flow rate of group-III sources, both the Al concentration in the solid and the growth rate of AlGaN are decreased. It was also found that the Al concentration in the solid saturated as increasing the Al gas composition increased by increasing the flow rate of the Al source precursor. In addition, the influence of growth interruption when group-III sources are temporarily shut off on the optical quality of GaN/AlGaN single quantum well (QW) structures was studied to realize high-quality QWs. Photoluminescence measurements revealed that the emission peak is blueshifted as the interruption time increases and the emission intensity is maximized at a several-second short interruption time, indicating the GaN QW layer is evaporated during interruption at a high growth temperature. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.371840
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  • 2
    Electronic Resource
    Electronic Resource
    Overall and local distortion effects on the metal–nonmetal transitions of mixed valent perovskite type manganese oxides (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 3072-3075 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The metal–nonmetal (MN) transition data of mixed valent manganese oxide perovskitesA1−xAx′MnO3 (A: trivalent lanthanide metals, A′: divalent metals, 0.2〈x〈0.5) are analyzed in terms of the tolerance factor (t), and the standard deviation (σ) of the A-site cation sizes. The interplay of these two parameters that measure the overall and atomic scale distortions, respectively, determine whether a compound can show a MN transition or not and its transition temperature (TMN). In order to show a MN transition, a compound should have t〉0.906 andσ(approximately-less-than)σ=232t−202 (pm). Large t and small σ are favorable for high TMN.TMN data ofA0.7Ba0.15Sr0.15MnO3 (A=La, Pr, Nd, Sm),A0.7Ba0.15Ca0.15MnO3 (A=La, Pr, Nd, Sm),(La0.7Ca0.3)x(Gd0.7Ba0.3)1−xMnO3 (x=0.1, 0.3, 0.5, 0.7, 0.9), and(Nd0.7Ca0.3)x(Gd0.7Ba0.3)1−xMnO3(x=0.25, 0.3, 0.5, 0.55, 0.7, 0.75) newly synthesized are reported. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.366257
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  • 3
    Electronic Resource
    Electronic Resource
    All-optical Mach–Zehnder modulator using a photochromic dye-doped polymer (2002)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 80 (2002), S. 1710-1712 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An all-optical Mach–Zehnder modulator is demonstrated which is composed of a polymer waveguide doped with a photochromic dye in the core and a thick light blocking metal layer on it. The metal layer was opened on one arm of the Mach–Zehnder modulator, so that only one arm of the modulator could be irradiated by modulation light, thus allowing a differential phase shift. The optical modulator exhibited an extinction ratio of about −12 dB at a wavelength of 1.55 μm. A simple kinetic model developed to delineate the refractive index change in the dye-doped polymer film was applied to predict the evolution of the modulation characteristics. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1459111
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  • 4
    Electronic Resource
    Electronic Resource
    Low-resistance and thermally stable ohmic contact on p-type GaN using Pd/Ni metallization (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 1822-1824 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report a low-resistance thermally stable ohmic contact on p-type GaN using a promising contact scheme of Pd/Ni. Specific contact resistance as low as 5.7×10−5 Ω cm2 was obtained from the Pd (30 Å)/Ni (70 Å) contact annealed at 500 °C under an oxidizing ambient. NiO that formed at the surface prevented Pd atoms from outdiffusing, promoting the formation of Pd gallides, Ga2Pd5 and Ga5Pd. This reaction produces Ga vacancies below the contact, leading to enhancement of the thermal stability as well as reduction of the contact resistivity. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1403660
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  • 5
    Electronic Resource
    Electronic Resource
    Characteristics of Amorphous Indium Zinc Oxide Anode Films on Polycarbonate Substrate for Flexible Organic Light Emitting Diode (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 124-126 (June 2007), p. 399-402 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Electrical, optical, and structural properties of amorphous indium zinc oxide (IZO) anodefilms grown on flexible polycarbonate (PC) substrate were investigated. The x-ray diffraction (XRD)result shows that the IZO film grown at room temperature is complete amorphous structure due to lowsubstrate temperature. A sheet resistance of 34.1 ,/[removed info], average transmittance above 88.9% in visiblerange, and root mean spare roughness of 3.5~10.5 Å were obtained even in the amorphous IZO anodefilm grown on PC substrate at room temperature. It is shown that the Ir(ppy)3 doped-flexible organiclight emitting diode (OLED) fabricated on the amorphous IZO anode exhibit comparablecurrent-voltage-luminance characteristics as well as external quantum efficiency and powerefficiency to OLED fabricated on conventional ITO/glass substrate. These findings indicate that theIZO anode film is a promising anode material for the fabrication of flexible OLEDs
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.124-126.399.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Deformation Behavior of Reinforced Concrete Members with Prefabricated Fiber LaminateComposites (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 345-346 (Aug. 2007), p. 1245-1248 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The innovative method based on prefabricated fiber laminate composites bonded tolightweight precast panel was applied for quality control of RC strengthening members. Theexperimental investigations for this method were presented for flexural member. Three differentgroups such as control group without strengthening, conventional fiber bonding group and innovatedPFLC group bonded to precast panel. Tested results showed good or better capacities comparing toconventional strengthening method for flexural members. This investigation indicate that goodenhancement with respect to quality control and reliability can be possible by the installation andepoxy injection with prefabricated panel using fiber laminate composites
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.345-346.1245.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Measurements of Mechanical Properties of Thin Polymer Films by Nanoindentation Technique (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 270-273 (Aug. 2004), p. 1107-1112 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/48/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.270-273.1107.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Diatom composition and biomass variability in nearshore waters of Maxwell Bay, Antarctica, during the 1992/1993 austral summer (1997)
    Springer
    Polar biology 17 (1997), S. 123-130 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Diatom composition and biomass were investigated in the nearshore water (〈30 m in depth) of Maxwell Bay, Antarctica during the 1992/1993 austral summer. Epiphytic or epilithic diatoms such as Fragilaria striatula, Achnanthes brevipes var. angustata and Licmophora spp. dominated the water column microalgal populations. Within the bay, diatom biomass in surface water was several times higher at the nearshore (2.4–14 μg C l-1) than at the offshore stations (〉100 m) (1.2–3.2 μg C l-1) with a dramatic decrease towards the bay mouth. Benthic forms accounted for 〉90% of diatom carbon in all nearshore stations, while in the offshore stations planktonic forms such as Thalassiosira antarctica predominated (50–〉90%). Microscopic examination revealed that many of these diatoms have become detached from a variety of macroalgae growing in the intertidal and shallow subtidal bottoms. Epiphytic diatoms persistently dominated during a 19-day period in the water column at a fixed nearshore station, and the biomass of these diatoms fluctuated from 0.86 to 53 μg C l-1. A positive correlation between diatom biomass and wind speed strongly suggests that wind-driven resuspension of benthic forms is the major mechanism increasing diatom biomass in the water column.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003000050114
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  • 9
    Electronic Resource
    Electronic Resource
    Growth response to the stress of low osmotic potential, salinity and high pH in cultured shoot of Chinese poplars (1996)
    Springer
    Journal of forest research 1 (1996), S. 27-29 
    Details
    ISSN: 1610-7403
    Keywords: Chinese poplars ; high pH ; low osmotic potential ; salinity ; stress response
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract In vitro cultured shoots of three Chinese poplar species (Populus tomentosa, P. alba cv. Pyramidalis andP. euphratica) and an improved poplar (FS-51), as a control, were exposed to the stress of low osmotic potential, salinity and high pH, and the shoot growth was measured.P. tomentosa andP. euphratica could grow even under the high osmotic stress (0.5m mannitol; −1.7 MPa).P. euphratica shoots which were previously cultured on the medium containing 0.7m mannitol (−2.4 MPa) recovered its growth after being transplanted to the medium without mannitol. The shoot growth ofP. euphratica was not so reduced even on the medium containing 100 mM NaCl. However, growth of the other poplars markedly reduced with 10 mM NaCl. Medium pH (pH 5.8–10) also did not affect the shoot growth ofP. euphratica. These poplars have different tolerance to the stresses in cultured shootin vitro. P. euphratica was extremely tolerant to the stresses which are possible to damage plants in dry land.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02348336
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  • 10
    Electronic Resource
    Electronic Resource
    Plantlet regeneration from leaf protoplasts ofPopulus euphratica (1996)
    Springer
    Journal of forest research 1 (1996), S. 99-102 
    Details
    ISSN: 1610-7403
    Keywords: plant regeneration ; Populus euphratica ; protoplast isolation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Protoplasts were isolated from the leaves of sterile plants ofPopulus euphratica Oliv. by using 1% Cellulase “Onozuka” RS and 0.25% Pectolyase Y-23 in 0.6m of mannitol solution. Protoplasts were cultured in modified Murashige and Skoog's (MS) medium which contained no ammonium ions but was supplemented with BAP (6-benzylaminopurine), 2,4-D (2,4- dichlorophenoxy-acetic acid), and 1% sucrose at the cell density of 9×104/ml. Cell divisions occurred in every culture medium, especially in the medium containing 0.5 mg/l of BAP and 0.1 mg/l of 2,4-D, in which callus was successfully induced by successive culture through cell cluster formation. Shoots were regenerated from the callus, and their growth was enhanced on 1/2 MS medium containing 0.8 mg/l of BAP. Finally, shoots were rooted and plantlets were regenerated on 1/2 MS medium without a hormone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02348311
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