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  • AIRCRAFT COMMUNICATIONS AND NAVIGATION  (3)
  • ENERGY PRODUCTION AND CONVERSION  (2)
  • 1-O-hexadecyl-rac-glycerol 3-phosphate  (1)
  • 42.55.Gp  (1)
Collection
Keywords
Publisher
Years
  • 1
    Electronic Resource
    Electronic Resource
    The measurement of phosphatidate phosphohydrolase in human amniotic fluid
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Lipids and Lipid Metabolism 528 (1978), S. 331-343 
    Details
    ISSN: 0005-2760
    Keywords: 1-O-hexadecyl-rac-glycerol 3-phosphate ; 1-alkylglycerol-3-P
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0005-2760(78)90022-X
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Dopant-induced excimer laser ablation of poly(tetrafluoroethylene) (1992)
    Springer
    Applied physics 55 (1992), S. 488-493 
    Details
    ISSN: 1432-0649
    Keywords: 42.55.Gp ; 78.65 ; 81.60.Jw ; 82.50
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Clean ablation of poly(tetrafluoroethylene) (PTFE) at etch rates in excess of 7µm/pulse has been achieved with an excimer laser using 308nm radiation and a 25 ns pulse width. This was accomplished by doping the ultraviolet-transparent PTFE polymer with polyimide. Ablation rates were investigated as a function of fluence in the range from 1 to 12J/cm2 and dopant levels up to 15% (wt/wt). Results show that at a given fluence there exists an optimum absorption coefficient ⇌max, for which maximum ablation rates are achieved. The value of ⇌max was found to decrease with increasing fluence. The relationship between ⇌max and fluence was determined from existing ablation rate models and found to compare favorably with empirical results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00332507
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    Paper (German National Licenses)
    Fulltext
  • 3
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    Accelerated stress testing of amorphous silicon solar cells (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: A technique for performing accelerated stress tests of large-area thin a-Si solar cells is presented. A computer-controlled short-interval test system employing low-cost ac-powered ELH illumination and a simulated a-Si reference cell (seven individually bandpass-filtered zero-biased crystalline PIN photodiodes) calibrated to the response of an a-Si control cell is described and illustrated with flow diagrams, drawings, and graphs. Preliminary results indicate that while most tests of a program developed for c-Si cells are applicable to a-Si cells, spurious degradation may appear in a-Si cells tested at temperatures above 130 C.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    An accelerated stress testing program for determining the reliability sensitivity of silicon solar cells to encapsulation and metallization systems (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The use of accelerated testing methods in a program to determine the reliability attributes of terrestrial silicon solar cells is discussed. Different failure modes are to be expected when cells with and without encapsulation are subjected to accelerated testing and separate test schedules for each are described. Unencapsulated test cells having slight variations in metallization are used to illustrate how accelerated testing can highlight different diffusion related failure mechanisms. The usefulness of accelerated testing when applied to encapsulated cells is illustrated by results showing that moisture related degradation may be many times worse with some forms of encapsulation than with no encapsulation at all.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Evaluation of Microwave Landing System (MLS) effect on the delivery performance of a fixed-path metering and spacing system (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Metering and spacing (M & S) system's algorithms described assume an aircraft two dimensional are navigation capability. The three navigation systems compared were: very high frequency omnidirectional range/distance measuring equipment (VOR/DME) and ILS, VOR/DME and + or - 40 MLS, and VOR/DME and + or - 60 MLS. Other factors studied were M & S tentative schedule point location, route geometry effects, and approach gate location effects. Summarized results are: the MLS offers some improvement over VOR/DME and ILS if all approach routes contain computer assisted turns; pilot reaction to moving the gate closer to the runway threshold may adversely affect M & S performance; and coupling en route metering to terminal scheduling transfers most of the terminal holding to more full efficient, higher altitude en route delay.
    Keywords: AIRCRAFT COMMUNICATIONS AND NAVIGATION
    Type: NASA-TP-1844 , L-14069
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Studies of uncontrolled air traffic patterns, phase 1 (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The general aviation air traffic flow patterns at uncontrolled airports are investigated and analyzed and traffic pattern concepts are developed to minimize the midair collision hazard in uncontrolled airspace. An analytical approach to evaluate midair collision hazard probability as a function of traffic densities is established which is basically independent of path structure. Two methods of generating space-time interrelationships between terminal area aircraft are presented; one is a deterministic model to generate pseudorandom aircraft tracks, the other is a statistical model in preliminary form. Some hazard measures are presented for selected traffic densities. It is concluded that the probability of encountering a hazard should be minimized independently of any other considerations and that the number of encounters involving visible-avoidable aircraft should be maximized at the expense of encounters in other categories.
    Keywords: AIRCRAFT COMMUNICATIONS AND NAVIGATION
    Type: NASA-CR-141397 , RTI-43U-840
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Research in ground-based near-terminal area 4D guidance and control (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: This paper describes work being done at NASA, Langley Research Center and at the Research Triangle Institute on advanced, ground-based guidance and control for the near terminal area. Large-scale computer traffic simulations in conjunction with flight experiments with a Boeing 737 aircraft will be used to evaluate various concepts for automated terminal area metering and spacing. The all-digital real-time air traffic simulation model is described. Facilities for aircraft tracking and for interfacing the aircraft with the digital simulation are discussed, along with possible application to other types of experiments.
    Keywords: AIRCRAFT COMMUNICATIONS AND NAVIGATION
    Type: ICAS PAPER 76-57 , Congress; Oct 03, 1976 - Oct 08, 1976; Ottawa; Canada
    Format: text
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    NASA TECHNICAL REPORTS
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