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  • 1
    Electronic Resource
    Electronic Resource
    InGaAs/InP graded-index quantum well lasers with nearly ideal static characteristics (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 1222-1224 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have examined static properties of step and continuously graded single and multiple quantum well InGaAs/InP lasers grown by atmospheric pressure metalorganic vapor phase epitaxy. Systematic changes in the band gap of InGaAsP waveguide layers have resulted in lasers with low threshold current (〈10 mA), high quantum efficiency (26% per facet) and power output (∼70 mW), and the effective loss of 2–5 cm−1. We show that the changes in threshold current in short lasers can be explained by a switch from the n=1 to n=2 level. The level switching results in a very flat and wide (〉1000 A(ring)) gain profile.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.102521
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  • 2
    Electronic Resource
    Electronic Resource
    Properties and chemical stability of hot-rolled Ag(7 at. % Cu)-sheathed Bi2Sr2Ca0.64Cu1.64Ox powder-in-tube tapes (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 4596-4607 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Bi2Sr2Ca0.64Cu1.64Ox (nominally Bi2212) powders were fabricated into powder-in-tube Ag- and Ag(7 at. % Cu)-sheathed tapes by cold and hot rolling to investigate the effects of sheath composition and rolling conditions on their microstructural development and superconducting properties. Bi2212 tapes with Ag(Cu) sheaths exhibited improved grain alignment and interfacial uniformity, as well as enhanced formation of the Bi-free phase (≈Sr7.5Ca6.5Cu14Ox), relative to the Ag-sheathed specimens. The hot-rolled Ag(Cu)-sheathed tapes displayed superior critical current densities (Jc), where magnetization Jcm=1.5×106 (H(parallel)c) and 4.6×105 A/cm2 (H⊥c) at T=5 K, H=1 T. Correspondingly, these specimens had transport critical current densities (Jct) of 6.7×104 A/cm2 (H(parallel)c) and 5.4×104 A/cm2 (H⊥c) at T=4.2 K, H=0 T and 2.2×104 A/cm2 (H(parallel)c) and 3.0×104 A/cm2 (H⊥c) at T=4.2 K, H=14 T. The chemical stability of the Ag(Cu) sheath regions during the partial melting process was also studied. Rapid oxidation of copper produced Cu2O precipitates in the sheath at 885 °C, and subsequently a Cu2O-free zone developed near the core/sheath interface. A theoretical analysis of Cu2O precipitate formation and decomposition during thermal processing is presented. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359805
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  • 3
    Electronic Resource
    Electronic Resource
    Platinum enhanced textured growth of grain-aligned YBa2Cu3O7−x thick films (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 5218-5226 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effects of magnetic alignment, heat treatment, and substrate interactions on the microstructural development and properties of YBa2Cu3O7−x (Y123) thick films were studied. Aligned films were formed by vacuum filtrating a particulate suspension in a 7 T applied field. These films and nonaligned control films were fired on either platinum (Pt) foil or magnesium oxide (MgO) substrates to various maximum temperatures between 930 and 1040 °C. Optical microscopy revealed large differences in microstructural development between the various films. Aligned Y123 films fired on Pt foil exhibited the best microstructural properties. Via plasma emission spectroscopy and secondary ion mass spectroscopy, approximately 0.1 wt % Pt was found distributed throughout the films fired on platinum, while negligible amounts of Mg were detected in the films fired on MgO substrates. Differential thermal analysis revealed that, in the presence of Pt, the peritectic temperature (1030 °C for pure Y123 in O2) is reduced 70 °C, thereby opening a substantial thermal processing window for partial melt assisted growth of textured Y123. SQUID measurements of magnetic hysteresis and Tc provided quantitative evidence that, relative to the films fired on MgO, those fired on Pt exhibited enhanced texture development [ΔM(Happ(parallel)c axis)/ΔM(Happ⊥c axis)=2.6 at 5 K, 1 T] and properties (Bean model Jc,m=5×104 A/cm2 at 5 K, 4 T) without degradation of the Tc characteristics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355719
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  • 4
    Electronic Resource
    Electronic Resource
    Application of Trichoderma and Gliocladium in alginate pellets for control of Rhizoctonia damping-off (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 36 (1987), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Alginate pellets were prepared from wet fermentor biomass of 11 isolates of Trichoderma spp. and Gliocladium virens, with wheat bran as a food base carrier. Pellets with eight of the isolates reduced survival (34-78%) of Rhizoctonia solani in infested beet seed in soil. Pellets containing a T. harzianum isolate (Th-58) and a T. hamatum isolate (TRI-4) were the most effective. All isolates significantly reduced growth of the pathogen from infested beet seed into natural soil. Populations of isolates proliferated in soil to 106−1011 colony-forming units/g (cfu) from propagules within the pellets. Pellets with TRI-4 reduced pathogen survival and growth (〉70%) in six different soils and were effective against six R. solani isolates in a natural loamy sand. Survival of R. solani in infested beet seed was not reduced when TRI-4 pellets were added to soil 1-6 weeks before the pathogen; however, saprophytic growth was prevented. Small amounts of biomass (3.0–7.5 g wet weight) in pellets were as effective as a large amount (300 g) in suppressing the pathogen. The storage of pellets for more than 6 weeks at 5 or 25C reduced their effectiveness against R. solani. Pellets prepared with four and three of the 11 isolates prevented damping-off of cotton and sugar beet in the greenhouse, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3059.1987.tb02260.x
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  • 5
    Electronic Resource
    Electronic Resource
    Characteristics of alginate pellets formulated with Trichoderma and Gliocladium and their effect on the proliferation of the fungi in soil (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 34 (1985), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Pelletized formulations of wheat bran or kaolin clay in an alginate gel containing conidia, chlamydospores, or fermentor biomass (FB) of several isolates of the biocontrol fungi Trichoderma spp. and Gliocladium virens were prepared. The ability of fungal propagules within the pellets to proliferate in soil was determined. Higher population densities were obtained when alginate pellets added to soil contained chlamydospores rather than condia, and bran rather than kaolin as the bulking agent. The active ingredient in pellets prepared from FB was approximately 5% biomass by weight and contained many chlamydospores. Colony-forming units (cfu) ranged from 106’to 1010/g of soil after soil amendment with FB pellets of 12 Trichoderma and G. virens isolates. Population densities were high during the first 3 weeks of incubation and declined only gradually during 9 weeks. Propagules in FB pellets were more viable at 5° than at 25°C. Viability at 25°C remained high (〉 70%) after 1 week, but declined to less than 10% after 24 weeks. Despite reduction in propagule viability in stored pellets, numbers of cfu formed after adding these pellets to soil were comparable with those formed from freshly prepared pellets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3059.1985.tb01409.x
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of Gliocladium and Trichoderma on damping-off and blight of snapbean caused by Sclerotium rolfsii in the greenhouse (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 38 (1989), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Aqueous suspensions of conidia of 285 wild-type strains and mutants of Gliocladium virens, Trichoderma hamatum, T. harzianum and T. viride were tested against Sclerotium rolfsii in the greenhouse. Ten strains of G. virens and four strains of T. harzianum suppressed damping-off of snapbean by 30-50% and blight by 36-74%. All strains of T. hamatum and T. viride tested as conidia were ineffective. In general, strains of G. virens were more effective in suppressing disease in the greenhouse than strains of T. harzianum. Several strains of G. virens and T. harzianum used alone were equal to or more effective than double and triple mixtures of such strains in disease suppression. Of four formulations of G. virens tested, germlings, alginate-bran-fermenter biomass pellets, and Pyrax-fermenter biomass mixtures reduced disease considerably and all three formulations were more effective than conidia in aqueous suspension. Strain G1-3 of G. virens added to soil as Pyrax-fermenter biomass mixtures in amounts to provide colony-forming units ranging from 1 -5 × 103 to 1 -2 × 104 per g soil provided statistically significant protection of the host at all concentrations. The extent of biological control with strains G1-3 and G1-21 of G. virens also depended on the strain of the pathogen used. Both strains effectively suppressed disease caused by strain Sr-1 (small sclerotia) of S. rolfsii. They were partially effective against strain Sr-116 (medium size sclerotia) and ineffective against strain Sr-3 (large sclerotia). Although strains G1-3 and G1-21 colonized the sclerotia of all three strains of S. rolfsii in soil effectively, they only reduced germinability of sclerotia of strain Sr-1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3059.1989.tb02144.x
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  • 7
    Electronic Resource
    Electronic Resource
    Transport properties of magnetic field/liquid assisted textured YBa2Cu3O7−x thick films (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 3028-3030 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Textured YBa2Cu3O7−x thick films (thickness ≈1 mm) were fabricated by vacuum filtration in an applied magnetic field (H=7 T). Platinum (1 wt %) was incorporated to induce liquid phase-assisted densification in films fired between 960 and 1030 °C in oxygen. The transport critical current densities (Jct) of films fired to 1030 °C exhibited nearly field insensitive behavior between H=0–3 T (H(parallel)c-axis) at 77 K, with Jct≈2500 A/cm2 and corresponding critical currents (Ic) of nearly 100 A at H=1 T. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.115443
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  • 8
    Electronic Resource
    Electronic Resource
    Platinum-enhanced densification of grain-aligned YBa2Cu3O7−x films (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 103-105 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Grain-aligned YBa2Cu3O7−x films were fabricated by vacuum filtration in an applied magnetic field (7 T). Platinum (Pt) was shown to lower the peritectic temperature of YBa2Cu3O7−x by almost 75 °C, leading to dramatic microstructural differences between films densified on MgO (single crystal) substrates and those densified on Pt foil to a maximum temperature of 1020 °C in oxygen. Superconducting quantum-interference device hysteresis loops measured at 0–5.5 T at 5 K showed that films fired on Pt had ΔM (Happ(parallel)c axis) values 15–60 times larger than those fired on MgO.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.110907
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  • 9
    Electronic Resource
    Electronic Resource
    THERMAL CONVECTION AND EQUILIBRIUM LIQUID-PHASE EPITAXIAL GROWTH (1983)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 404 (1983), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1983.tb19480.x
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  • 10
    Electronic Resource
    Electronic Resource
    A New Method for the Separation, Detection and Estimation of Inorganic Compounds (1948)
    [s.l.] : Nature Publishing Group
    Nature 162 (1948), S. 691-692 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A FEW years ago, Dr. A. J. P. Martin and his colleagues at the Wool Industries Research Association1 developed a technique using solvent extraction on absorbent paper for the separation and detection of mixtures of amino-acids. This process, which the discoverers termed ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/162691a0
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