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  • 1
    Electronic Resource
    Electronic Resource
    The Rheological Properties of Plasticized Nitrocellulose as a function of nitrocellulose precursor (1988)
    Weinheim : Wiley-Blackwell
    Propellants, Explosives, Pyrotechnics 13 (1988), S. 99-102 
    Details
    ISSN: 0721-3115
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Propellant cords have been manufactured from nitrocellulose/nitroglycerin (50/50) pastes containing different types of nitrocellulose. The cords were manufactured using a solvent wet process involving incorporation and extrusion in the highly instrumented propellants processing facility at Waltham Abbey. It has been shown that the biological source from which the nitrocellulose is manufactured (wood or cotton) has a significant influence upon the dough rheology, cord diameter, shear heating and ultimate tensile strength of the dried cords. Additionally, the influence of extrusion rate upon the above parameters has been highlighted. This work compliments that previously undertaken upon the influence of nitrocellulose molecular weight on the properties of propellant doughs and dried cords.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prep.19880130402
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    Paper (German National Licenses)
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  • 2
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    A study for systematic errors of the GLA forecast model in tropical regions (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: From the sensitivity studies performed with the Goddard Laboratory for Atmospheres (GLA) analysis/forecast system, it was revealed that the forecast errors in the tropics affect the ability to forecast midlatitude weather in some cases. Apparently, the forecast errors occurring in the tropics can propagate to midlatitudes. Therefore, the systematic error analysis of the GLA forecast system becomes a necessary step in improving the model's forecast performance. The major effort of this study is to examine the possible impact of the hydrological-cycle forecast error on dynamical fields in the GLA forecast system.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NASA-TM-101194 , NAS 1.15:101194
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Meteorological atlas of the Southern Hemisphere lower stratosphere for August and September 1987 (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Southern Hemisphere meteorological data for the months of August and September 1987 in the lower stratosphere are shown. National Meteorological Center (NMC) data, Total Ozone Mapping Spectrometer (TOMS) data, and Goddard Laboratory for Atmospheres (GLA) data are used to display polar stereographic projections of 200 to 100 mb vertical mean temperatures, 100 mb zonal mean geopotential height perturbations, total ozone, Ertel's potential vorticity (Epv), and 50 to 30 mb vertical mean temperatures. In addition, latitude height cross sections at 65 W of potential temperature, Epv, geostrophic isotachs, and temperature are also shown. Finally, a longitude height cross section at 65 S of temperature and geostrophic wind vectors is also shown.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NASA-TM-4049 , REPT-88B0189 , NAS 1.15:4049
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Research highlights of the global modeling and simulation branch for 1986-1987 (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This document provides a summary of the research conducted in the Global Modeling and Simulation Branch and highlights the most significant accomplishments in 1986 to 1987. The Branch has been the focal point for global weather and climate prediction research in the Laboratory for Atmospheres through the retrieval and use of satellite data, the development of global models and data assimilation techniques, the simulation of future observing systems, and the performance of atmospheric diagnostic studies.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NASA-TM-4085 , REPT-88B0279 , NAS 1.15:4085
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    The collective emission of electromagnetic waves from astrophysical jets - Luminosity gaps, BL Lacertae objects, and efficient energy transport (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A model of the inner portions of astrophysical jets is constructed in which a relativistic electron beam is injected from the central engine into the jet plasma. This beam drives electrostatic plasma wave turbulence, which leads to the collective emission of electromagnetic waves. The emitted waves are beamed in the direction of the jet axis, so that end-on viewing of the jet yields an extremely bright source (BL Lacertae object). The relativistic electron beam may also drive long-wavelength electromagnetic plasma instabilities (firehose and Kelvin-Helmholtz) that jumble the jet magnetic field lines. After a sufficient distance from the core source, these instabilities will cause the beamed emission to point in random directions and the jet emission can then be observed from any direction relative to the jet axis. This combination of effects may lead to the gap turn-on of astrophysical jets. The collective emission model leads to different estimates for energy transport and the interpretation of radio spectra than the conventional incoherent synchrotron theory.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 326; 110-124
    Format: text
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    NASA TECHNICAL REPORTS
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