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  • 1
    Electronic Resource
    Electronic Resource
    Tropane alkaloids from Schizanthus hookeri
    Amsterdam : Elsevier
    Phytochemistry 19 (1980), S. 2007-2008 
    Details
    ISSN: 0031-9422
    Keywords: 3α-senecioyloxytropan-6β-ol ; 6β-angeloyloxytropan-3α-ol. ; Schizanthus hookeri ; Solanaceae ; hygrolines ; tropine
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0031-9422(80)83023-8
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Tropane alkaloids from Schizanthus grahamii
    Amsterdam : Elsevier
    Phytochemistry 26 (1987), S. 819-822 
    Details
    ISSN: 0031-9422
    Keywords: 3α-senecioyloxytropane. ; Schizanthus grahamii ; Solanaceae ; mesaconic, itaconic diesters ; tropane alkaloids
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0031-9422(00)84794-9
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    Paper (German National Licenses)
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  • 3
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    Coherent Laser Instrument Would Measure Range and Velocity (2005)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: A proposed instrument would project a narrow laser beam that would be frequency-modulated with a pseudorandom noise (PN) code for simultaneous measurement of range and velocity along the beam. The instrument performs these functions in a low mass, power, and volume package using a novel combination of established techniques. Originally intended as a low resource- footprint guidance sensor for descent and landing of small spacecraft onto Mars or small bodies (e.g., asteroids), the basic instrument concept also lends itself well to a similar application guiding aircraft (especially, small unmanned aircraft), and to such other applications as ranging of topographical features and measuring velocities of airborne light-scattering particles as wind indicators. Several key features of the instrument s design contribute to its favorable performance and resource-consumption characteristics. A laser beam is intrinsically much narrower (for the same exit aperture telescope or antenna) than a radar beam, eliminating the need to correct for the effect of sloping terrain over the beam width, as is the case with radar. Furthermore, the use of continuous-wave (CW), erbium-doped fiber lasers with excellent spectral purity (narrow line width) permits greater velocity resolution, while reducing the laser s power requirement compared to a more typical pulsed solid-state laser. The use of CW also takes proper advantage of the increased sensitivity of coherent detection, necessary in the first place for direct measurement of velocity using the Doppler effect. However, measuring range with a CW beam requires modulation to "tag" portions of it for time-of-flight determination; typically, the modulation consists of a PN code. A novel element of the instrument s design is the use of frequency modulation (FM) to accomplish both the PN-modulation and the Doppler-bias frequency shift necessary for signed velocity measurements. This permits the use of a single low-power waveguide electrooptic phase modulator, while simultaneously mitigating the effects of speckle as a noise source in the coherent detection.
    Keywords: Man/System Technology and Life Support
    Type: NPO-40403 , NASA Tech Briefs, February 2005; 9-10
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Propulsive Reaction Control System Model (2011)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: This software models a propulsive reaction control system (RCS) for guidance, navigation, and control simulation purposes. The model includes the drive electronics, the electromechanical valve dynamics, the combustion dynamics, and thrust. This innovation follows the Mars Science Laboratory entry reaction control system design, and has been created to meet the Mars Science Laboratory (MSL) entry, descent, and landing simulation needs. It has been built to be plug-and-play on multiple MSL testbeds [analysis, Monte Carlo, flight software development, hardware-in-the-loop, and ATLO (assembly, test and launch operations) testbeds]. This RCS model is a C language program. It contains two main functions: the RCS electronics model function that models the RCS FPGA (field-programmable-gate-array) processing and commanding of the RCS valve, and the RCS dynamic model function that models the valve and combustion dynamics. In addition, this software provides support functions to initialize the model states, set parameters, access model telemetry, and access calculated thruster forces.
    Keywords: Man/System Technology and Life Support
    Type: NPO-46978 , NASA Tech Briefs, November 2011; 13
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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