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  • 1
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    Growth, Spectroscopy and Photorefractive Investigation of Vanadium Doped CdSSe (1997)
    In:  CASI
    Details
    Publication Date: 2019-08-15
    Description: We present two-wave mixing results obtained with a CdS(0.8)Se(0.2):V crystal. The CdS(0.8)Se(0.2):V crystal was grown by physical vapor transport (PVT) along with a concentration of 150 ppm (nominal) vanadium for creating trap centers. The as-grown crystal has a large crystal size, good optical quality, and a medium resistivity of 10(exp 6) - 108 ohms-cm. A large photorefractive gain coefficient of ().24 cm-' was observed at 633 nm with an optical intensity of 60 mW/cm(exp 2) and a grating period of 1.6 microns. To our knowledge, this is the first observation of the photorefractive effect in a vanadium doped CdSSe crystal. Room temperature absorption and low temperature photoluminescence spectroscopy measurements are also discussed. With a significant photorefractive effect, the CdSSe:V crystals are promising for device applications based on photorefractive effect, in the wavelength range of 600-700 nm.
    Keywords: Inorganic, Organic and Physical Chemistry
    Type: URC97033 , NASA University Research Centers Technical Advances in Education, Aeronautics, Space, Autonomy, Earth and Environment; 1; 191-196
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  • 2
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    The tribal placement of the monospecific tropical African genus Petitiocodon (Rubiaceae) based on molecular data and morphology (2008)
    In:  Blumea - Biodiversity, Evolution and Biogeography of Plants (0006-5196) vol.53 (2008) nr.3 p.549
    Details
    Publication Date: 2015-03-06
    Description: A first phylogenetic placement of Petitiocodon based on molecular sequence data from three plastid regions (accD-psa1, rpl16 and trnL-F) is presented, in conjunction with a reassessment of morphology for the genus. Our results do not support an evolutionary affinity between Petitiocodon and Tricalysia (Coffeeae) as suggested by previous studies, but they confirm other research that Petitiocodon and Didymosalpinx are distinct genera. Placement of Petitiocodon in tribe Octotropideae is well-supported on the basis of molecular data and floral and carpological characters.
    Keywords: Octotropideae ; African flora ; accD-psa1 ; rpl16 ; trnL-F ; molecular phylogenetics ; placentation
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
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  • 3
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    The tribal placement of the monospecific tropical African genus Petitiocodon (Rubiaceae) based on molecular data and morphology (2008)
    In:  Blumea: Biodiversity, Evolution and Biogeography of Plants vol. 53 no. 3, pp. 549-565
    Details
    Publication Date: 2024-01-12
    Description: A first phylogenetic placement of Petitiocodon based on molecular sequence data from three plastid regions (accD-psa1, rpl16 and trnL-F) is presented, in conjunction with a reassessment of morphology for the genus. Our results do not support an evolutionary affinity between Petitiocodon and Tricalysia (Coffeeae) as suggested by previous studies, but they confirm other research that Petitiocodon and Didymosalpinx are distinct genera. Placement of Petitiocodon in tribe Octotropideae is well-supported on the basis of molecular data and floral and carpological characters.
    Keywords: Octotropideae ; African flora ; accD-PSA1 ; rpl16 ; trnL-F ; molecular phylogenetics ; placentation
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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  • 4
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    The tribal placement of the monospecific tropical African genus Petitiocodon (Rubiaceae) based on molecular data and morphology (2008)
    In:  Blumea: Biodiversity, Evolution and Biogeography of Plants vol. 53 no. 3, pp. 549-565
    Details
    Publication Date: 2024-01-12
    Description: A first phylogenetic placement of Petitiocodon based on molecular sequence data from three plastid regions (accD-psa1, rpl16 and trnL-F) is presented, in conjunction with a reassessment of morphology for the genus. Our results do not support an evolutionary affinity between Petitiocodon and Tricalysia (Coffeeae) as suggested by previous studies, but they confirm other research that Petitiocodon and Didymosalpinx are distinct genera. Placement of Petitiocodon in tribe Octotropideae is well-supported on the basis of molecular data and floral and carpological characters.
    Keywords: Octotropideae ; African flora ; accD-psa1 ; rpl16 ; trnL-F ; molecular phylogenetics ; placentation
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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  • 5
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    COSMIC: Carbon Monoxide and Soot in Microgravity Inverse Combustion (2001)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Almost seventy percent of deaths in accidental fires are caused by inhalation of toxins such as carbon monoxide (CO) and smoke (soot) that form during underventilated burning. The COSMIC project examines the formation mechanisms of CO and soot during underventilated combustion, achieved presently using laminar, inverse diffusion flames (IDFs) formed between an air jet and surrounding fuel. A major hypothesis of the project is that the IDF mimics underventilated combustion because carbon-containing species that form on the fuel side of the flame (such as CO and soot) can escape without passing through an oxidizing flame tip. An IDF literature review was presented at the last microgravity workshop, and a few additional IDF papers have appeared since that meeting. The COSMIC project is entering the third year of its four-year funding cycle. The first two years have been devoted to designing and constructing a rig for use in the NASA 2.2-second drop tower. A few computations and laboratory experiments have been performed. The goals of this paper are to discuss the use of numerical simulation during burner design, to present computational and experimental results that support the hypothesis that IDFs are similar to underventilated flames, and to delineate future plans.
    Keywords: Inorganic, Organic and Physical Chemistry
    Type: Sixth International Microgravity Combustion Workshop; 177-180; NASA/CP-2001-210826
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  • 6
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    Cell and Particle Interactions and Aggregation During Electrophoretic Motion (2000)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The objectives of this research were (i) to perform experiments for observing and quantifying electrophoretic aggregation, (ii) to develop a theoretical description to appropriately analyze and compare with the experimental results, (iii) to study the combined effects of electrophoretic and gravitational aggregation of large particles, and the combined effects of electrophoretic and Brownian aggregation of small particles, and (iv) to perform a preliminary design of a potential future flight experiment involving electrophoretic aggregation. Electrophoresis refers to the motion of charged particles, droplets or molecules in response to an applied electric field. Electrophoresis is commonly used for analysis and separation of biological particles or molecules. When particles have different surface charge densities or potentials, they will migrate at different velocities in an electric field. This differential migration leads to the possibility that they will collide and aggregate, thereby preventing separation.
    Keywords: Inorganic, Organic and Physical Chemistry
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  • 7
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    Update on N2O4 Molecular Sieving with 3A Material at NASA/KSC (2000)
    In:  Other Sources
    Details
    Publication Date: 2019-08-13
    Description: During its operational life, the Shuttle Program has experienced numerous failures in the Nitrogen Tetroxide (N2O4) portion of Reaction Control System (RCS), many of which were attributed to iron-nitrate contamination. Since the mid-1980's, N2O4 has been processed through a molecular sieve at the N2O4 manufacturer's facility which results in an iron content typically less than 0.5 parts-per-million-by-weight (ppmw). In February 1995, a Tiger Team was formed to attempt to resolve the iron nitrate problem. Eighteen specific actions were recommended as possibly reducing system failures. Those recommended actions include additional N2O4 molecular sieving at the Shuttle launch site. Testing at NASA White Sands Test Facility (WSTF) determined an alternative molecular sieve material could also reduce the water-equivalent content (free water and HNO3) and thereby further reduce the natural production of iron nitrate in N2O4 while stored in iron-alloy storage tanks. Since April '96, NASA Kennedy Space Center (KSC) has been processing N2O4 through the alternative molecular sieve material prior to delivery to Shuttle launch pad N2O4 storage tanks. A new, much larger capacity molecular sieve unit has also been used. This paper will evaluate the effectiveness of N2O4 molecular sieving on a large-scale basis and attempt to determine if the resultant lower-iron and lower-water content N2O4 maintains this new purity level in pad storage tanks and shuttle flight systems.
    Keywords: Inorganic, Organic and Physical Chemistry
    Type: JANNAF 29th Propellant Development and Characterization Subcommittee Meeting; 777-785; CPIA-Publ-697|Propellant Development and Characterization; May 08, 2000 - May 12, 2000; Cocoa Beach, FL; United States
    Format: text
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  • 8
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    Methodology for the effective stabilization of tin-oxide-based oxidation/reduction catalysts (2011)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The invention described herein involves a novel approach to the production of oxidation/reduction catalytic systems. The present invention serves to stabilize the tin oxide reducible metal-oxide coating by co-incorporating at least another metal-oxide species, such as zirconium. In one embodiment, a third metal-oxide species is incorporated, selected from the group consisting of cerium, lanthanum, hafnium, and ruthenium. The incorporation of the additional metal oxide components serves to stabilize the active tin-oxide layer in the catalytic process during high-temperature operation in a reducing environment (e.g., automobile exhaust). Moreover, the additional metal oxides are active components due to their oxygen-retention capabilities. Together, these features provide a mechanism to extend the range of operation of the tin-oxide-based catalyst system for automotive applications, while maintaining the existing advantages.
    Keywords: Inorganic, Organic and Physical Chemistry
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  • 9
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    Stabilized tin-oxide-based oxidation/reduction catalysts (2008)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The invention described herein involves a novel approach to the production of oxidation/reduction catalytic systems. The present invention serves to stabilize the tin oxide reducible metal-oxide coating by co-incorporating at least another metal-oxide species, such as zirconium. In one embodiment, a third metal-oxide species is incorporated, selected from the group consisting of cerium, lanthanum, hafnium, and ruthenium. The incorporation of the additional metal oxide components serves to stabilize the active tin-oxide layer in the catalytic process during high-temperature operation in a reducing environment (e.g., automobile exhaust). Moreover, the additional metal oxides are active components due to their oxygen-retention capabilities. Together, these features provide a mechanism to extend the range of operation of the tin-oxide-based catalyst system for automotive applications, while maintaining the existing advantages.
    Keywords: Inorganic, Organic and Physical Chemistry
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  • 10
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    In-situ Thermal Treatment of Trichloroethene at Marshall Space Flight Center (2008)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: This viewgraph presentation describes the in-situ thermal treatment of trichloroethene at Marshall space Flight Center. The contents include: 1) Background 1 and 2; 2) Source Area-13; 3) In-situ Thermal Treatment; 4) SA-13 Lithology; 5) SA-13 In-Situ Thermal TS; 6) SA-13 ISTD System Components; 7) ISTD Overview; 8) Heaters; 9) SA-13 ISTD Wellfield Layout; 10) SA-13 Well Field; 11) ISTD Process and Instrumentation; 12) Treatment Zone Temperature; 13) SA-13 System Removals; 14) SA-13 DNAPL (typical photos); 15) Treatment Results 1-5; and 16) SA-13 TCE Removal Summary.
    Keywords: Inorganic, Organic and Physical Chemistry
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