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  • Data  (5)
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  • 1
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    Thermal modulation for gas chromatography (2007)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: A thermal modulator device for gas chromatography and associated methods. The thermal modulator device includes a cooling member, an electrically conductive capillary in direct thermal contact with the cooling member, and a power supply electrically coupled to the capillary and operable for controlled resistive heating of the capillary.
    Keywords: Electronics and Electrical Engineering
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Thermal modulation for gas chromatography (2007)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: A thermal modulator device for gas chromatography and associated methods. The thermal modulator device includes a recirculating fluid cooling member, an electrically conductive capillary in direct thermal contact with the cooling member, and a power supply electrically coupled to the capillary and operable for controlled resistive heating of the capillary. The capillary can include more than one separate thermally modulated sections.
    Keywords: Structural Mechanics
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Improved Thermal Modulator for Gas Chromatography (2008)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: An improved thermal modulator has been invented for use in a variant of gas chromatography (GC). The variant in question denoted as two-dimensional gas chromatography (2DGC) or GC-GC involves the use of three series-connected chromatographic columns, in the form of capillary tubes coated interiorly with suitable stationary phases (compounds for which different analytes exhibit different degrees of affinity). The two end columns are relatively long and are used as standard GC columns. The thermal modulator includes the middle column, which is relatively short and is not used as a standard GC column: instead, its temperature is modulated to affect timed adsorption and desorption of analyte gases between the two end columns in accordance with a 2DGC protocol.
    Keywords: Fluid Mechanics and Thermodynamics
    Type: GSC-14855-1 , NASA Tech Briefs, January 2008; 29-30
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    (Table 3) Furans, thiophenes, pyrroles and naphthalenes in pyrolyzates from insolation cycle 94 sapropel of ODP Hole 161-974C (2011)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 1,2-Dimethylnaphthalene; 1,3-Dimethylnaphthalene; 1,5-Dimethylnaphthalene; 1,6-Dimethylnaphthalene; 1,7-Dimethylnaphthalene; 161-974C; 1-Ethyl-1H pyrrole; 1-Methyl-1H pyrrole; 1-Methylnaphthalene; 2,3,4-Trimethyl pyrrole; 2,3,5-Trimethylfuran; 2,3,5-Trimethyl pyrrole; 2,3-Dimethyl pyrrole; 2,3-Dimethyl thiophene; 2,4-Dimethyl thiophene; 2,5-Dimethyl furan; 2,5-Dimethyl pyrrole; 2,5-Dimethyl thiophene; 2,6-Dimethylnaphthalene; 2,7-Dimethylnaphthalene; 2-Ethyl-4-methyl pyrrole; 2-Ethyl-5-methyl furan; 2-Ethyl thiophene; 2-Methylnaphthalene; 2-Methyl thiophene; 3-Ethyl thiophene; 3-Methyl thiophene; 4-Methyl-2-propyl furan; AGE; Butyl thiophene; Depth, composite; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Intercore correlation; Joides Resolution; Leg161; Naphthalene; Ocean Drilling Program; ODP; Propylthiophene; Sample code/label; Tirreno Sea
    Type: Dataset
    Format: text/tab-separated-values, 192 data points
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    DATA PANGAEA
  • 5
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    (Table 2) Alk-1-enes and alk-2-enes in pyrolyzates from insolation cycle 94 sapropel of ODP Hole 161-974C (2011)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 161-974C; AGE; Alk-1-ene; Alk-2-ene; Depth, composite; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Intercore correlation; Joides Resolution; Leg161; Ocean Drilling Program; ODP; Sample code/label; Tirreno Sea
    Type: Dataset
    Format: text/tab-separated-values, 156 data points
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    DATA PANGAEA
  • 6
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    (Table 4) Benzene and indane isomers in pyrolyzates from insolation cycle 94 sapropel of ODP Hole 161-974C (2011)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 1,2,3,4-Tetramethylbenzene; 1,2,3-Trimethyl benzene; 1,2,4,5-Tetramethylbenzene; 1,2,4-Trimethylbenzene; 1,3,5-Trimethylbenzene; 161-974C; 1-Ethyl-2,4-dimethyl-benzene; 1-Ethyl-2-methylbenzene; 1-Ethyl-3-methylbenzene; 1-Ethyl-4-methylbenzene; 1-Methyl-2-propylbenzene; 1-Methyl-4-(2-methylpropyl)-benzene; 2-Ethyl-1,4-dimethyl-benzene; AGE; Benzene; Butylbenzene; Depth, composite; DEPTH, sediment/rock; Dimetheylindane; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Ethylbenzene; Hexylbenzene; Indane; Intercore correlation; Isopropylbenzene; Joides Resolution; Leg161; Methylindane; Ocean Drilling Program; ODP; Pentylbenzene; Propylbenenze; Sample code/label; Tirreno Sea; Toluene; Xylene
    Type: Dataset
    Format: text/tab-separated-values, 174 data points
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    DATA PANGAEA
  • 7
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    (Table 1) Average chain length of alkanes from insolation cycle 94 sapropel of ODP Hole 161-974C (2011)
    PANGAEA
    Details
    Publication Date: 2024-01-09
    Keywords: 161-974C; AGE; Average chain length; Comment; Depth, composite; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Intercore correlation; Joides Resolution; Leg161; Ocean Drilling Program; ODP; Sample code/label; Tirreno Sea
    Type: Dataset
    Format: text/tab-separated-values, 26 data points
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  • 8
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    Organic geochemistry of sediments from sapropel 94 of ODP Hole 161-974C (2011)
    PANGAEA
    In:  Supplement to: Payeur, Amy L; Meyers, Philip A; Sacks, Richard D (2011): Evaluation of on-line pyrolysis two-dimensional gas chromatography time-of-flight mass spectrometry (Py–GC×GC–ToFMS) on whole sediments from a Mediterranean sapropel sequence. Organic Geochemistry, 42(10), 1263-1270, https://doi.org/10.1016/j.orggeochem.2011.07.008
    Details
    Publication Date: 2024-01-09
    Description: Analysis of the molecular composition of the organic matter (OM) from whole sediment samples can avoid analytical bias that might result from isolation of components from the sediment matrix, but has its own analytical challenges. We evaluated the use of GC * GC-ToFMS to analyze the pyrolysis products of six whole sediment samples obtained from above, within and below a 1 million year old OM-rich Mediterranean sapropel layer. We found differences in pyrolysis products 〈n-C22 between the OM-rich sapropel samples and the OM-poor background marls. The presence of alkyl pyrroles, probably derived from chlorophyll, in pyrolysates of the sapropels but not in those of the marls suggests that higher marine productivity and greater OM preservation accompanied deposition of the sapropels. Detection of tetramethyl benzenes considered to be pyrolysis products of isorenieratene in the sapropel samples is evidence that nitrogen-fixing green sulfur bacteria contributed to the high productivity. Greater abundances of shorter chain aliphatic hydrocarbons, pyrroles, furans and alkyl aromatics in the pyrolysates of sapropel samples relative to the marls confirm better preservation of marine OM in the sapropels. In addition, the presence of greater amounts of thiophenes in the sapropels than in the marls is consistent with the existence of euxinic conditions during sapropel deposition. The combination of whole sediment pyrolysis and GC × GC-ToFMS is promising, but the procedure requires careful selection of its multiple analytical variables, particularly the pyrolysis temperature and the operational features of the GC columns.
    Keywords: 161-974C; DRILL; Drilling/drill rig; Joides Resolution; Leg161; Ocean Drilling Program; ODP; Tirreno Sea
    Type: Dataset
    Format: application/zip, 4 datasets
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    DATA PANGAEA
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