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  • 1
    Electronic Resource
    Electronic Resource
    Novel high-power and coherent semiconductor laser with a shaped unstable resonator (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 66 (1995), S. 2048-2050 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We describe a novel high power semiconductor laser that employs a shaped unstable resonator waveguide to maintain fundamental spatial mode operation at high power levels. We call this device the SHUR (shaped unstable resonator) laser. By photoetching and regrowth we locate a secondary, nonplanar antiguide, beneath the main part of the waveguide. The lasing mode couples to this secondary guide and experiences lateral antiguiding, which is the basis of the unstable resonator action. Prototype versions of the SHUR laser show a maximum pulsed output power of 770 mW per facet. The focused beam is dominated by a single lobe that contains 47% of the output power. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.113688
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  • 2
    Electronic Resource
    Electronic Resource
    High-power spatially coherent operation of unstable resonator semiconductor lasers with regrown lens trains (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 61 (1992), S. 1272-1274 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have obtained high-power spatially coherent operation in wide-stripe InGaAs/GaAs/AlGaAs semiconductor lasers using a monolithic unstable resonator [consisting of diverging lens elements incorporated above an asymmetric graded-index separate confinement heterostructure (AGRIN-SCH)]. The fabrication involves MOCVD regrowth after wet-chemical etching of lens-like patterns in a GaAs layer above the active region. Pulsed output powers of 175 and 490 mW have been obtained in 170- and 100-μm-wide lasers, respectively, with spatial coherence in the near field exceeding 60%. We observe good lateral mode discrimination up to 3.5 times threshold in the 100-μm stripes with a round-trip magnification of 6.4.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.107615
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  • 3
    Electronic Resource
    Electronic Resource
    Application of response-surface methodology to evaluate the optimum environmental conditions for the enhanced production of surfactin (1997)
    Springer
    Applied microbiology and biotechnology 47 (1997), S. 358-363 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Response-surface methodology was applied to determine the effect of the fermentation process conditions, namely pH, temperature, rates of agitation and aeration, on surfactin production. The effects of the mutual interactions between these parameters were extensively studied to optimize the process conditions for the maximum production of surfactin. With a view to simultaneously reducing the number of experiments and obtaining the mutual interactions between the variables required for achieving the optimal experimental conditions, a 24 full-factorial central composite design followed by multi-stage Monte-Carlo optimization was employed for experimental design and analysis of the results. The optimum process conditions for the enhanced production of surfactin were as follows: pH = 6.755, temperature = 37.4 °C, agitation = 140 rpm and aeration = 0.75 vvm. Relative surfactin concentrations were denoted by the reciprocal of the critical micelle concentrations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530050940
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  • 4
    Electronic Resource
    Electronic Resource
    Biodegradation of phenol and cresol isomer mixtures by Arthrobacter (1997)
    Springer
    World journal of microbiology and biotechnology 13 (1997), S. 659-663 
    Details
    ISSN: 1573-0972
    Keywords: Arthrobacter ; biodegradation ; competitive inhibition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The Arthrobacter species can degrade phenol, o-cresol and p-cresol much faster (as reflected in high specific growth rates) than other microbes which are reported to degrade toxic compounds. In mixtures, phenol and p-cresol mutually inhibited each other; the inhibition constants show that phenol degradation is strongly inhibited in the presence of p-cresol rather than reverse. o-Cresol enhanced phenol degradation marginally but o-cresol degradation was not affected by the presence of phenol.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018518904730
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of pH on solvent flux during stirred ultrafiltration of proteins (1981)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 23 (1981), S. 1873-1880 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260230813
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  • 6
    Electronic Resource
    Electronic Resource
    Anomalous flux behavior in initial time stirred protein ultrafiltration through partially permeable membranes (1979)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 24 (1979), S. 1581-1585 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1979.070240620
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  • 7
    Electronic Resource
    Electronic Resource
    Thermal Decomposition of Rare Earth Metal Oxalates. I. Oxalates of Lanthanum, Praseodymium and Neodymium (1963)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 324 (1963), S. 90-95 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Die thermische Zersetzung der Oxalathydrate von Lanthan (4H2O), Praseodym (4H2O) und Neodym (5H2O) zum betreffenden Oxid verlauft im Gegensatz zu den Oxalaten anderer Seltenerdmetalle über basische Carbonate. Dies wurde durch thermogravimetrische Untersuchungen ermittelt. Für eine intermediare Bildung niederer Hydrate ergaben sich jedoch keine Anzeichen. Nach vollständiger Entwässerung, die bei 350-390 °C erreicht ist, erfolgt eine rasche Zersetzung der wasserfreien Oxalate. Durch eine besondere Zersetzungstechnik wurde erfunden, daß wasserfreies Lanthanoxalat bei 300°C noch stabil ist.
    Notes: Thermal decomposition studies of the oxalate-hydrates of lanthanum, praseodymium and neodymium on a Stanton thermobalance have shown that these form a group, giving stable intermediate products (basic carbonates) before final decomposition t o the oxide. Intermediate weight levels corresponding to lower hydrates have not been obtained. The final stage of dehydration of these oxalates is followed by rapid decomposition, indicating that the anhydrous oxalates are unstable. The mechanism of decomposition of lanthanum oxalate is investigated in detail. modified decomposition procedure on the thermobalance has, however, shown that anhydrous lanthanum oxalate is fairly stable at 300°C.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19633240110
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  • 8
    Electronic Resource
    Electronic Resource
    Thermal Decomposition of Rare Earth Metal Oxalates. II. Oxalates of Samarium, Europium, Gadolynium, Terbium and Dysprosium (1963)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 324 (1963), S. 96-98 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Es wurden die Oxalathydrate der Seltenerdmetalle Sm, Eu, Gd, Tb und Dy thermogravimetrisch zersetzt. Dabei wurden keinerlei Anzeichen für das intermediäre Auftreten von niederen Hydraten oder basischen Carbonaten gefunden. Bei 690-720° C ist die Zersetzung zum betreffenden Metalloxid vollständig.
    Notes: Thermal decomposition of the hydrated oxalates of the above rare earth metals was carried out on a Stanton thermobalance. The oxalates after precipitation were dried at 110° C for six hours and then used for the decomposition studies. No indications of the formation of stable lower hydrates or of intermediate basic carbonates were obtained. Weight levels corresponding to oxide formation were shown in the temperature range 690-720°C.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19633240111
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  • 9
    Electronic Resource
    Electronic Resource
    Thermal Decomposition of Rare Earth Metal Oxalates. IV. Oxalates of Cerium and Thorium (1963)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 324 (1963), S. 103-105 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Die thermische Zersetzung von Cer(III)-oxalat-3-Hydrat und Thoriumoxalat-2-Hydrat wurde thermogravimetrisch untersucht. In beiden Fällen ergaben sich keine Anzeichen für die intermediäre Bildung von niederen Hydraten, auch nicht für ein Thoriumoxalat-1-Hydrat, das - laut Literatur - bei 140°C auftreten soll. Infolge gleichzeitiger Oxydation zu Cer(IV) unterscheidet sich der Zersetzungsverlauf beim Cersalz von dem der Oxalate anderer Seltenerdmetalle.
    Notes: The thermal decomposition of the hydrated oxalates of cerium(III) and thorium has been studied by means of a Stanton thermobalance. The thermolysis pattern of cerium oxalate shows an anomalous behaviour differing from that of other rare-earth metal oxalates. Constant weight levels corresponding to lower hydrates have not been obtained. Several points of resemblances are noticed in the decomposition patterns of cerium oxalate and thorium oxalate. Formation of thorium oxalate monohydrate at 140° C, as reported, has not been observed during the present studies.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19633240113
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  • 10
    Electronic Resource
    Electronic Resource
    Thermal Decomposition of Rare Earth Metal Oxalates. III. Oxalates of Holmium, Erbium, Thulium, Ytterbium, Lutetium and Yttrium (1963)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 324 (1963), S. 99-102 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Es wurden die Oxalat-3-Hydrate der schweren Seltenerdmetalle und des Yttriums thermogravimetrisch zersetzt: Im Temperaturbereich von 230-330° C bilden sich die Dihydrate; es folgt die vollständige Entwässerung und danach zwischen 400 und 460° C ein weiterer, rascher Gewichtsverlust; bei 680-700° C entspricht der Gewichtsverlust einer vollständigen Bildung der betreffenden Metalloxide. Anzeichen für das intermediäre Auftreten von basischen Carbonaten wurden nicht gefunden.
    Notes: Thermal decompositions of the oxalates of the heavy rare earth metals and of yttrium were carried out on a Stanton thermobalance. These oxalates on precipitation and drying at 110° C for six hours, gave the trihydrates which were used in the decomposition studies. Dihydrates, stable in the temperature range 230 to 330° C were formed before complete dehydration. Maximum decomposition was found to take place between 400 and 460° C. Weight levels corresponding to oxide formation were obtained in the temperature range 680-700° C without any indication of formation of intermediate products.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19633240112
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