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  • 1
    Publication Date: 2019-07-13
    Description: Air transportation is critical to U.S. and Global economic vitality. However, energy and climate issues challenge aviations ability to be sustainable in the long term. Aviation must dramatically reduce fuel use and related emissions. Energy costs to U.S. airlines nearly tripled between 1995 and 2011, and continue to be the highest percentage of operating costs. The NASA Advanced Air Transports Technology Project addresses the comprehensive challenge of enabling revolutionary energy efficiency improvements in subsonic transport aircraft combined with dramatic reductions in harmful emissions and perceived noise to facilitate sustained growth of the air transportation system. Advanced technologies and the development of unconventional aircraft systems offer the potential to achieve these improvements. The presentation will highlight the NASA vision of revolutionary systems and propulsion technologies needed to achieve these challenging goals. Specifically, the primary focus is on the N+3 generation; that is, vehicles that are three generations beyond the current state of the art, requiring mature technology solutions in the 2025-30 timeframe, which are envisioned as being powered by Hybrid Electric Propulsion Systems.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN23468 , AIAA Distinguished Lectureship; 12-May-15; Cleveland, OH; United States
    Format: application/pdf
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  • 2
    Publication Date: 2019-07-13
    Description: Presentation to Aerospace Electrical Systems Expo, providing an overview of NASA's work on hybrid electric and all electric propulsion and projecting technology needs.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN23587 , Aerospace Electrical Systems Expo 2015; 19-21 May 2015; Long Beach, CA; United States
    Format: application/pdf
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  • 3
    Publication Date: 2019-07-13
    Description: No abstract available
    Keywords: Aircraft Propulsion and Power
    Type: E-663270 , AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit; 30 Jul. - 1 Aug. 2012; Atlanta, GA; United States
    Format: application/pdf
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  • 4
    Publication Date: 2019-07-13
    Description: No abstract available
    Keywords: Aircraft Propulsion and Power
    Type: E-663266 , Aircraft Noise and Emissions Reduction Symposium (ANERS); 25-27 Oct. 2011; Marseille; France
    Format: application/pdf
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  • 5
    Publication Date: 2019-07-13
    Description: No abstract available
    Keywords: Aircraft Propulsion and Power
    Type: E-663265 , ISABE Conference; 12-16 Sep. 2011; Gothenberg; Sweden
    Format: application/pdf
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  • 6
    Publication Date: 2019-07-13
    Description: Center Director Free is providing the Keynote at the Disruptive Propulsion Conference, sponsored by Cranfield University, Cranfield, Bedfordshire, England in November. Director Free will be presenting a PowerPoint presentation titled, NASA Green Propulsion Technologies Pushing Aviation to New Heights at both the conference and a meeting at the Royal Aeronautical Society.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN18619 , Disruptive Green Propulsion Technologies-Beyond the Competitive Horizon; 17-18 Nov. 2014; London; United Kingdom
    Format: application/pdf
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  • 7
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    In:  CASI
    Publication Date: 2019-07-13
    Description: The benefits of electrified aircraft propulsion improves aircrafts like single aisle transports, enables new configurations of vertical take-off landing aircrafts and revitalizes the economic case for small short-range aircraft services. Future strategies and markets for supersonic and commercial transport are proposed.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN58749 , AIAA Propulsion & Energy Forum; 9-11 Jul. 2018; Cincinnati, OH; United States
    Format: application/pdf
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  • 8
    Publication Date: 2019-09-20
    Description: Air transportation is critical to U.S. and Global economic vitality. However, energy and climate issues challenge aviation's ability to be sustainable in the long term. Aviation must dramatically reduce fuel use and related emissions. Energy costs to U.S. airlines nearly tripled between 1995 and 2011, and continue to be the highest percentage of operating costs. The NASA Advanced Air Transports Technology Project addresses the comprehensive challenge of enabling revolutionary energy efficiency improvements in subsonic transport aircraft combined with dramatic reductions in harmful emissions and perceived noise to facilitate sustained growth of the air transportation system. Advanced technologies and the development of unconventional aircraft systems offer the potential to achieve these improvements. The presentation will highlight the NASA vision of revolutionary systems and propulsion technologies needed to achieve these challenging goals. Specifically, the primary focus is on the N+3 generation; that is, vehicles that are three generations beyond the current state of the art, requiring mature technology solutions in the 2025-30 timeframe.
    Keywords: Aircraft Propulsion and Power
    Type: GRC-E-DAA-TN20707 , OSU Aerospace Graduate Student Seminar; Jan 30, 2015; Columbus, OH; United States
    Format: application/pdf
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  • 9
    ISSN: 0749-503X
    Keywords: dolichol-PP-GlcNAc2 ; translocation ; endoplasmic reticulum ; alg1 ; exoglucanase ; S. cerevisiae ; Life and Medical Sciences ; Genetics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: Transfer of truncated oligosaccharides to yeast exoglucanase (Exg) in Saccharomyces cerevisiae alg1 has been investigated. When incubated at the non-permissive temperature, alg1 cells secreted into the culture medium, in addition to the exoglucanase glycoforms secreted by wild type, underglycosylated forms as well as material with ionic properties of the non-glycosylated enzyme. As expected, none of the latter had affinity towards concanavalin A, but part of it bound to wheat germ agglutinin (WGA), suggesting that it contained, in addition to non-glycosylated Exg, glycoforms carrying non-reducing terminal GlcNAc. Only the WGA-bound material could be labelled with galactosyltransferase; furthermore, the label could be released by treatment with peptide-N4-N-acetyl-β-glucosamine asparagine amidase. These results unambiguously demonstrate that GlcNAc2 can be transferred from dolichol-PP-GlcNAc2 to one or both sequons of yeast Exg. Accordingly, they support previous observations suggesting that this early intermediate is able to translocate in vivo in order to make its sugar portion accessible to the oligosaccharyltransferase in the lumen of the endoplasmic reticulum. © 1998 John Wiley & Sons, Ltd.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: In the light of accumulating data that implicate cell surface heparan sulfate proteoglycans (HSPGs) with a role in cell interactions with extracellular matrix molecules such as fibronectin, we have compared the properties of these molecules in wild-type BHK cells and an adhesion-defective ricin-resistant mutant (RicR14). Our results showed that the mutant, unlike BHK cells, cannot form focal adhesions when adherent to planar substrates in the presence of serum. Furthermore, while both cell lines possess similar amounts of cell surface HSPG with hydrophobic properties, that of RicR14 cells had decreased sulfation, reduced affinity for fibronectin and decreased half-life on the cell surface when compared to the normal counterpart. Our conclusions based on this data are that these altered properties may, in part, account for the adhesion defect in the ricin-resistant mutant. Whether this results from the known alteration in assembly of N-linked glycans affecting the carbohydrate chains on the proteoglycan or some other combination of factors is discussed.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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