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  • 1
    Digitale Medien
    Digitale Medien
    A stability-indicating HPLC method for the determination of benzalkonium chloride in 0.5% tramadol ophthalmic solution (1995)
    Springer
    Chromatographia 40 (1995), S. 155-158 
    Details
    ISSN: 1612-1112
    Schlagwort(e): Column liquid chromatography ; Benzalkonium chloride ; Tramadol ; Ophthalmic solution
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary A high-performance liquid chromatographic procedure employing ultraviolet detection for the analysis of benzalkonium chloride in 0.5% Tramadol ophthalmic solution is reported. The method requires minimal sample pretreatment and is sensitive, accurate, and reproducible. The peak area versus BAK concentration is linear over the range of 50–150% of its label claim of 0.05 mg/mL. The mean absolute recovery of BAK using the described method is 100.2±1.2%, (mean ±SD, n=10). A stress study with heat, acid, base and UV radiation indicates that the method is stabilityindicating with no interference from drug or degradation products.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02272164
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 2
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    Unbekannt
    ISPM X-band uplink technology demonstration. Part 1: Overview (1981)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Beschreibung: The ground and spacecraft hardware research, design, and implementation lead to an end to end in flight technology demonstration on the International Solar Polar Mission spacecraft. An introduction to the overall effort is given and the flight experiment objectives are established. The expected improvements in the telecommunications performance are summarized. Also presented is a conceptual mission operations plant.
    Schlagwort(e): COMMUNICATIONS AND RADAR
    Materialart: Telecommun. and Data Acquisition; p 50-62
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 3
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    Unbekannt
    Codeless GPS Applications to Multi-Path: CGAMP (1990)
    In:  CASI
    Details
    Publikationsdatum: 2013-08-31
    Beschreibung: Cordless Global Positioning System (GPS) Applications to Multi-Path (CGAMP) is meeting the challenge of exploiting the L-band signals from the Global Positioning System (GPS) satellites for the measurement of the impulse response of radio transmission channels over space-Earth paths. This approach was originally suggested by E. K. Smith and has been pursued by J. Lemmon, without an affordable implementation being identifiable. In addition to the high cost of a suitable P code correlating GPS receiver, there is also the major impediment of the often announced Department of Defense policy of selective availability/anti-spoof (SA/AS) that clouds reliable access to the wideband (20 MHz) P channel of the GPS signals without cryptographic access. A technique proposed by MacDoran utilizes codeless methods for exploiting the P channel signals implemented by the use of a pair of antennas and cross correlation signal detection.
    Schlagwort(e): COMMUNICATIONS AND RADAR
    Materialart: JPL, California Inst. of Tech.,Proceedings of; JPL, California Inst
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 4
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    Synthesis of a large communications aperture using small antennas (1994)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: In this report we compare the cost of an array of small antennas to that of a single large antenna assuming both the array and single large antenna have equal performance and availability. The single large antenna is taken to be one of the 70-m antennas of the Deep Space Network. The cost of the array is estimated as a function of the array element diameter for three different values of system noise temperature corresponding to three different packaging schemes for the first amplifier. Array elements are taken to be fully steerable paraboloids and their cost estimates were obtained from commercial vendors. Array loss mechanisms and calibration problems are discussed. For array elements in the range 3 - 35 m there is no minimum in the cost versus diameter curve for the three system temperatures that were studied.
    Schlagwort(e): COMMUNICATIONS AND RADAR
    Materialart: NASA-CR-197330 , JPL-PUBL-94-15 , NAS 1.26:197330
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
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