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  • Environment Pollution  (4)
  • Polymer and Materials Science  (3)
  • Expression evaluation  (1)
  • ASTROPHYSICS
  • Chemical Engineering
  • Physics
  • 1995-1999  (8)
  • 1
    Electronic Resource
    Electronic Resource
    Dynamic expression trees (1995)
    Springer
    Algorithmica 13 (1995), S. 245-265 
    Details
    ISSN: 1432-0541
    Keywords: Dynamic algorithm ; Expression evaluation ; Series-parallel digraph
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract We present a technique for dynamically maintaining a collection of arithmetic expressions represented by binary trees (whose leaves are variables and whose internal nodes are operators). A query operation asks for the value of an expression (associated with the root of a tree). Update operations include changing the value of a variable and combining or decomposing expressions by linking or cutting the corresponding trees. Our dynamic data structure uses linear space and supports queries and updates in logarithmic time. An important application is the dynamic maintenance of maximum flow and shortest path in series-parallel digraphs under a sequence of vertex and edge insertions, series and parallel compositions, and their respective inverses. Queries include reporting the maximum flow or shortestst-path in a series-parallel subgraph.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01190506
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Hydrogenation of ring opening metathesis polymerization polymers (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 58 (1995), S. 1041-1046 
    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
    Notes: Various methods of hydrogenating ring opening metathesis polymerization (ROMP) polymers were investigated as part of an effort to improve their stability and increase their usefulness as matrix materials for nanocluster synthesis. Hydrogenation with Pd/BaSO4 catalyst in high-pressure hydrogen gas was only partly successful and limited to unfunctionalized polymers such as polymethyltetracyclododecene. Block copolymers containing phosphine or carboxylic acid functionalities were successfully hydrogenated by diimide generated in situ from p toluenesulfonylhydrazide. © 1995 John Wiley & Sons, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1995.070580610
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Morphological and thermal investigations of nylon-6-poly(sulfone ether)-nylon-6 triblock copolymers (1995)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 46 (1995), S. 307-311 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Three triblock copolymers of nylon-6 (Ny6) and aromatic poly(sulfone ether) (PSuE) were investigated relative to their morphology and their thermal properties. Generally, the nylon blocks of the three Ny6-PSuE-Ny6 samples were very short (between 5 and 16 monomer units). Heterogeneous, microphase-separated morphologies could be observed for all samples, independent of the processing conditions, i.e., solvent casting or melt cooling. However, the process conditions were highly influential on the formation of the supramolecular structures (i.e., spherulites), especially when the crystallizable block was short.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1995.010460404
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  • 4
    Electronic Resource
    Electronic Resource
    Silver nanocluster formation within microphase-separated block copolymers (1996)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 47 (1996), S. 340-343 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Silver cluster formation in bulk block copolymer films (static-cast) and in thin films (microtomed or spin-coated) was investigated by transmission electron microscopy. In all cases, the silver clusters were formed predominantly within the original silver-containing microdomains. A greater degree of control of cluster formation and a narrower cluster size distribution were achieved in the thin films of block copolymers. The interfaces between domains of the heterogeneous copolymers and the free interfaces of the thin film specimens all played an important role in nucleation and growth of clusters.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1996.010470804
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  • 5
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    The Influence of Airmass Histories on Radical Species during POLARIS (1999)
    In:  CASI
    Details
    Publication Date: 2013-08-29
    Description: The Goddard trajectory chemistry model was used with ER-2 aircraft data to test our current knowledge of radical photochemistry during the POLARIS (Polar Ozone Loss in the Arctic Region In Summer) campaign. The results of the trajectory chemistry model with and without trajectories are used to identify cases where steady state does not accurately describe the measurements. Over the entire mission, using trajectory chemistry reduces the variability in the modeled NO(x) comparisons to data by 25% with respect to the same model simulating steady state. Although the variability is reduced, NO(x)/NO(y) trajectory model results were found to be systematically low relative to the observations by 20-30% as seen in previous studies. Using new rate constants for reactions important in NO(y) partitioning improves the agreement of NO(x)/NO(y) with the observations but a 5-10% bias still exists. OH and HO2 individually are underpredicted by 15% of the standard steady state model and worsen with the new rate constants. Trajectory chemistry model results of OH/HO2 were systematically low by 10-20% but improve using the new rates constants because of the explicit dependence on NO. This suggests that our understanding of NO(x) is accurate to the 20% level and HO(x) chemistry is accurate to the 30% level in the lower stratosphere or better for the POLARIS regime. The behavior of the NO(x) and HO(x) comparisons to data using steady state versus trajectory chemistry and with updated rate coefficients is discussed in ten-ns of known chemical mechanisms and lifetimes.
    Keywords: Environment Pollution
    Format: application/pdf
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  • 6
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    The Role of HO(x) in Super- and Subsonic Aircraft Exhaust Plumes (1997)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The generation of sulfuric acid aerosols in aircraft exhaust has emerged as a critical issue in determining the impact of supersonic aircraft on stratospheric ozone. It has long been held that the first step in the mechanism of aerosol formation is the oxidation of SO2 emitted from the engine by OH in the exhaust plume. We report in situ measurements of OH and HO2 in the exhaust plumes of a supersonic (Air France Concorde) and a subsonic (NASA ER-2) aircraft in the lower stratosphere. These measurements imply that reactions with OH are responsible for oxidizing only a small fraction of SO2 (2%), and thus cannot explain the large number of particles observed in the exhaust wake of the Concorde.
    Keywords: Environment Pollution
    Type: Paper-96GL03724 , Geophysical Research Letters (ISSN 0094-8534); 24; 1; 65-68
    Format: text
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  • 7
    facet.materialart.
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    The Role of HOx in Super-and Subsonic Aircraft Exhaust Plumes (1997)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The generation of sulfuric acid aerosols in aircraft exhaust has emerged as a critical issue in determining the impact of supersonic aircraft on stratospheric ozone. It has long been held that the first step in the mechanism of aerosol formation is the oxidation of SO2 emitted from the engine by OH in the exhaust plume. We report in situ measurements of OH and HO2 in the exhaust plumes of a supersonic (Air France Concorde) and a subsonic (NASA ER-2) aircraft in the lower stratosphere. These measurements imply that reactions with OH are responsible for oxidizing only a small fraction of SO2 (2%), and thus cannot explain the large number of particles observed in the exhaust wake of the Concorde.
    Keywords: Environment Pollution
    Type: Paper-96GL03724 , Geophysical Research Letters (ISSN 0094-8534); 24; 1; 65-68
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    The Role of HO(x) in Super- and Subsonic Aircraft Exhaust Plumes (1997)
    In:  Other Sources
    Details
    Publication Date: 2019-08-15
    Description: The generation of sulfuric acid aerosols in aircraft exhaust has emerged as a critical issue in determining the impact of supersonic aircraft on stratospheric ozone. It has long been held that the first step in the mechanism of aerosol formation is the oxidation of SO2, emitted from the engine by OH in the exhaust plume. We report in situ measurements of OH and HO, in the exhaust plumes of a supersonic (Air France Concorde) and a subsonic (NASA ER-2) aircraft in the lower stratosphere. These measurements imply that reactions with OH are responsible for oxidizing only a small fraction of SO2 (2%), and thus cannot explain the large number of particles observed in the exhaust wake of the Concorde.
    Keywords: Environment Pollution
    Type: Paper-96GL03724 , Geophysical Research Letters (ISSN 0094-8534); 24; 1; 65-68
    Format: text
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    NASA TECHNICAL REPORTS
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