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  • 1
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    (Table 1) Molecular and carbon-isotopic compositions of void gas from DSDP Leg 96
    PANGAEA
    In:  Supplement to: Pflaum, Ronald C; Brooks, James M; Cox, H Benjamin; Kennicutt, Mahlon C; Sheu, Der-Duen (1986): Molecular and isotopic analysis of core gases and gas hydrates, Deep Sea Drilling Project Leg 96. In: Bouma, AH; Coleman, JM; Meyer, AW; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 96, 781-784, https://doi.org/10.2973/dsdp.proc.96.149.1986
    Details
    Publication Date: 2023-06-27
    Description: Molecular and isotopic compositions of void gases from Sites 618 and 619 were determined. The gases were predominantly methane with the C1/C2 ratios averaging 4,000 and 26,000 at Sites 618 and 619, respectively. The delta13C-C1 values at Site 618 were nearly constant, ranging from - 70.1 to - 73.7 per mil. delta13C-CH1 values for Site 619 between 76 and 178 meters sub-bottom ranged from - 94.8 to - 70.8 per mil, becoming progressively heavier with depth. The molecular and isotopic compositions at both sites are characteristic of biogenic methane. Small spheres (~ 1-2 mm diameter) of gas hydrates were observed in the Orca Basin between 20 and 40 m sub-bottom and were often associated with sandy sections. The hydrate was predominantly methane with a delta13-C1 of - 7 per mil and trace amounts of ethane, propane, and carbon dioxide. The isotopic value for the methane was similar to that of the nearest gas pocket, indicating that hydrate was formed from predominantly biogenic methane without isotopic fractionation.
    Keywords: 96-618; 96-619; 96-620; 96-621; Carbon dioxide; Deep Sea Drilling Project; DEPTH, sediment/rock; DRILL; Drilling/drill rig; DSDP; DSDP/ODP/IODP sample designation; Elevation of event; Ethane; Event label; Gas chromatograph Carle Model 800; Gas chromatograph Hewlett-Packard 571OA; Glomar Challenger; Gulf of Mexico; Gulf of Mexico/BASIN; Gulf of Mexico/FAN; Latitude of event; Leg96; Longitude of event; Mass spectrometer Nuclide RMS 60; Methane; Methane/ethane ratio; Sample code/label; δ13C, methane
    Type: Dataset
    Format: text/tab-separated-values, 191 data points
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    DATA PANGAEA
  • 2
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    Inversion layer MOS solar cells (1986)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Inversion layer (IL) Metal Oxide Semiconductor (MOS) solar cells were fabricated. The fabrication technique and problems are discussed. A plan for modeling IL cells is presented. Future work in this area is addressed.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA. Marshall Space Flight Center Research Reports: 1986 NASA(ASEE Summer Faculty Fellowship Program; 21 p
    Format: application/pdf
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  • 3
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    Further study of inversion layer MOS solar cells (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A group of inversion layer MOS solar cells has been fabricated. The highest value of open-circuit voltage obtained for the cells is 0.568V. One of the cells has produced a short-circuit current of 79.6 mA and an open-circuit voltage of 0.54V. It is estimated that the actual area AMO efficiency of this cell is 6.6 percent with an assumed value of 0.75 for its fill factor. Efforts made for fabricating an IL/MOS cell with reasonable efficiencies are reported. Future work for 4 sq cm IL cells and 25 sq cm IL cells is discussed.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA. Marshall Space Flight Center, Research Reports: 1987 NASA(ASEE Summer Faculty Fellowship Program; 16 p
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  • 4
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    Studies of Large-Area Inversion-Layer Metal-Insulator-Semiconductor (IL/MIS) Solar Cells and Arrays (1996)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Many inversion-layer metal-insulator-semiconductor (IL/MIS) solar cells have been fabricated. There are around eighteen 1 cm(exp 2) IL/MIS solar cells which have efficiencies greater than 7%. There are only about three 19 cm(exp 2) IL/MIS cells which have efficiencies greater than 4%. The more accurate control of the thickness of the thin layer of oxide between aluminum and silicon of the MIS contacts has been achieved. A lot of effort and progress have been made in this area. A comprehensive model for MIS contacts under dark conditions has been developed that covers a wide range of parameters. It has been applied to MIS solar cells. One of the main advantages of these models is the prediction of the range of the thin oxide thickness versus the maximum efficiencies of the MIS solar cells. This is particularly important when the thickness is increased to 25 A. This study is very useful for our investigation of the IL/MIS solar cells. The two-dimensional numerical model for the IL/MIS solar cells has been tried to develop and the results are presented in this report.
    Keywords: Energy Production and Conversion
    Type: NASA-CR-201956 , NAS 1.26:201956
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  • 5
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    Ferroelectric Material Application: Modeling Ferroelectric Field Effect Transistor Characteristics from Micro to Nano (2006)
    In:  CASI
    Details
    Publication Date: 2018-06-12
    Description: All present ferroelectric transistors have been made on the micrometer scale. Existing models of these devices do not take into account effects of nanoscale ferroelectric transistors. Understanding the characteristics of these nanoscale devices is important in developing a strategy for building and using future devices. This paper takes an existing microscale ferroelectric field effect transistor (FFET) model and adds effects that become important at a nanoscale level, including electron velocity saturation and direct tunneling. The new model analyzed FFETs ranging in length from 40,000 nanometers to 4 nanometers and ferroelectric thickness form 200 nanometers to 1 nanometer. The results show that FFETs can operate on the nanoscale but have some undesirable characteristics at very small dimensions.
    Keywords: Electronics and Electrical Engineering
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  • 6
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    Numerical simulation of rarefied gas flow through a slit (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Two different approaches, the finite-difference method coupled with the discrete-ordinate method (FDDO), and the direct-simulation Monte Carlo (DSMC) method, are used in the analysis of the flow of a rarefied gas from one reservoir to another through a two-dimensional slit. The cases considered are for hard vacuum downstream pressure, finite pressure ratios, and isobaric pressure with thermal diffusion, which are not well established in spite of the simplicity of the flow field. In the FDDO analysis, by employing the discrete-ordinate method, the Boltzmann equation simplified by a model collision integral is transformed to a set of partial differential equations which are continuous in physical space but are point functions in molecular velocity space. The set of partial differential equations are solved by means of a finite-difference approximation. In the DSMC analysis, three kinds of collision sampling techniques, the time counter (TC) method, the null collision (NC) method, and the no time counter (NTC) method, are used.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 90-1694
    Format: text
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  • 7
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    Further study of inversion layer MIS solar cells (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Many inversion layer metal-insulator-semiconductor (IL/MIS) solar cells have been fabricated. As of today, the best cell fabricated by us has a 9.138 percent AMO efficiency, with FF = 0.641, V(sub OC) = 0.557 V, and I(sub SC) = 26.9 micro A. Efforts made for fabricating an IL/MOS solar cell with reasonable efficiencies are reported. The more accurate control of the thickness of the thin layer of oxide between aluminum and silicon of the MIS contacts has been achieved by using two different process methods. Comparison of these two different thin oxide processings is reported. The effects of annealing time of the sample are discussed. The range of the resistivity of the substrates used in the IL cell fabrication is experimentally estimated. Theoretical study of the MIS contacts under dark conditions is addressed.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-190212 , NAS 1.26:190212
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  • 8
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    DSMC analysis of species separation in rarefied nozzle flows (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The direct-simulation Monte Carlo method has been used to investigate the behavior of a small amount of a harmful species in the plume and the backflow region of nuclear thermal propulsion rockets. Species separation due to pressure diffusion and nonequilibrium effects due to rapid expansion into a surrounding low-density environment are the most important factors in this type of flow. It is shown that a relatively large amount of the lighter species is scattered into the backflow region and the heavier species becomes negligible in this region due to the extreme separation between species. It is also shown that the type of molecular interaction between the species can have a substantial effect on separation of the species.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 92-2859
    Format: text
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  • 9
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    FDDO and DSMC analyses of rarefied gas flow through 2D nozzles (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Two different approaches, the finite-difference method coupled with the discrete-ordinate method (FDDO), and the direct-simulation Monte Carlo (DSMC) method, are used in the analysis of the flow of a rarefied gas expanding through a two-dimensional nozzle and into a surrounding low-density environment. In the FDDO analysis, by employing the discrete-ordinate method, the Boltzmann equation simplified by a model collision integral is transformed to a set of partial differential equations which are continuous in physical space but are point functions in molecular velocity space. The set of partial differential equations are solved by means of a finite-difference approximation. In the DSMC analysis, the variable hard sphere model is used as a molecular model and the no time counter method is employed as a collision sampling technique. The results of both the FDDO and the DSMC methods show good agreement. The FDDO method requires less computational effort than the DSMC method by factors of 10 to 40 in CPU time, depending on the degree of rarefaction.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 92-2858
    Format: text
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  • 10
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    Internal structure of shock waves in disparate mass mixtures (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The detailed flow structure of a normal shock wave for a gas mixture is investigated using the direct-simulation Monte Carlo method. A variable diameter hard-sphere (VDHS) model is employed to investigate the effect of different viscosity temperature exponents (VTE) for each species in a gas mixture. Special attention is paid to the irregular behavior in the density profiles which was previously observed in a helium-xenon experiment. It is shown that the VTE can have substantial effects in the prediction of the structure of shock waves. The variable hard-sphere model of Bird shows good agreement, but with some limitations, with the experimental data if a common VTE is chosen properly for each case. The VDHS model shows better agreement with the experimental data without adjusting the VTE. The irregular behavior of the light-gas component in shock waves of disparate mass mixtures is observed not only in the density profile, but also in the parallel temperature profile. The strength of the shock wave, the type of molecular interactions, and the mole fraction of heavy species have substantial effects on the existence and structure of the irregularities.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: AIAA PAPER 92-0496
    Format: text
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