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  • COMMUNICATIONS AND RADAR  (6)
  • Cleavase I  (1)
  • Computational Chemistry and Molecular Modeling  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Cleavase Fragment Length Polymorphism (CFLP): A Methodology to Further Exploit Polymorphisms from PCR Products of Plastid DNA (ptDNA) in Phaseolus (1998)
    Springer
    Plant molecular biology reporter 16 (1998), S. 271-282 
    Details
    ISSN: 1572-9818
    Keywords: CFLP ; Cleavase I ; Phaseolus ; phylogeny ; ptDNA intergenic regions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The CFLP methodology was applied for Cleavase I site detection within ptDNA intergenic regions (atpB-rbcL and rps14-psaB) at both interspecific and intraspecific levels in the genus Phaseolus. Optimal Cleavase I reaction temperature was 55 °C and the semi-dry electrophoretic transfer was more efficient than the original capillary one. Cleavase reactions yield a high number of fragments as compared to PCR-RFLP and allowed differentiation within and between landraces and wild forms of the Lima bean (Phaseolus lunatus L.) originating from Andean and Mesoamerican regions of Latin America. From sequencing data and using stemloop program (GCG, Madison), congruent numbers of hairpins/fragments were identified within the sequences, highlighting the robustness of the Cleavase I. Our results pointed out the ubiquity of short conserved motifs amongst a geographically localized group of species. In the vicinity of these motifs, synapomorphic-like substitutions were frequently observed. A phylogenetic tree based on these sequences is congruent with the CFLP pattern as well as with the widely accepted phylogeny of the genus. The usefulness of this new tool as alternative and/or complementary to PCR-RFLP technology on ptDNA is suggested and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007500914695
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Optimized Gaussian basis sets for use with relativistic effective (core) potentials: Li—Ar (1991)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 40 (1991), S. 789-796 
    Details
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Balanced atomic basis sets, at the double-zeta level with d functions, have been developed for the elements Li—Ar within the relativistic effective core potential procedure. The number of primitive functions, their orbital exponents, and the number of contractions were chosen for use in both Hartree-Fock and correlated calculations. Spin-orbit splittings have been obtained using the approximate operator corresponding to relativistic effective potentials and are compared with experimental values.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560400608
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    Paper (German National Licenses)
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  • 3
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    On-board processing for future satellite communications systems: Satellite-Routed FDMA (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A frequency division multiple access (FDMA) 30/20 GHz satellite communications architecture without on-board baseband processing is investigated. Conceptual system designs are suggested for domestic traffic models totaling 4 Gb/s of customer premises service (CPS) traffic and 6 Gb/s of trunking traffic. Emphasis is given to the CPS portion of the system which includes thousands of earth terminals with digital traffic ranging from a single 64 kb/s voice channel to hundreds of channels of voice, data, and video with an aggregate data rate of 33 Mb/s. A unique regional design concept that effectively smooths the non-uniform traffic distribution and greatly simplifies the satellite design is employed. The satellite antenna system forms thirty-two 0.33 deg beam on both the uplinks and the downlinks in one design. In another design matched to a traffic model with more dispersed users, there are twenty-four 0.33 deg beams and twenty-one 0.7 deg beams. Detailed system design techniques show that a single satellite producing approximately 5 kW of dc power is capable of handling at least 75% of the postulated traffic. A detailed cost model of the ground segment and estimated system costs based on current information from manufacturers are presented.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-165419 , NASA/LERC-C-49029-D , MTR-8311
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Second year technical report on-board processing for future satellite communications systems (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Advanced baseband and microwave switching techniques for large domestic communications satellites operating in the 30/20 GHz frequency bands are discussed. The nominal baseband processor throughput is one million packets per second (1.6 Gb/s) from one thousand T1 carrier rate customer premises terminals. A frequency reuse factor of sixteen is assumed by using 16 spot antenna beams with the same 100 MHz bandwidth per beam and a modulation with a one b/s per Hz bandwidth efficiency. Eight of the beams are fixed on major metropolitan areas and eight are scanning beams which periodically cover the remainder of the U.S. under dynamic control. User signals are regenerated (demodulated/remodulated) and message packages are reformatted on board. Frequency division multiple access and time division multiplex are employed on the uplinks and downlinks, respectively, for terminals within the coverage area and dwell interval of a scanning beam. Link establishment and packet routing protocols are defined. Also described is a detailed design of a separate 100 x 100 microwave switch capable of handling nonregenerated signals occupying the remaining 2.4 GHz bandwidth with 60 dB of isolation, at an estimated weight and power consumption of approximately 400 kg and 100 W, respectively.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-165155 , MTR-8164 , TR-2
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    A frequency-division multiple-access system concept for 30/20 GHz high-capacity domestic satellite service (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Previously cited in issue 09, p. 1357, Accession no. A82-23484
    Keywords: COMMUNICATIONS AND RADAR
    Type: Journal of Spacecraft and Rockets (ISSN 0022-4650); 20; 619-625
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    An FDMA system concept for 30/20 GHz high capacity domestic satellite service (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The paper summarizes a feasibility study of a multibeam FDMA satellite system operating in the 30/20 GHz band. The system must accommodate a very high volume of traffic within the restrictions of a 5 kW solar cell array and a 2.5 GHz bandwidth. Multibeam satellite operation reduces the DC power demand and allows reuse of the available bandwidth. Interferences among the beams are brought to acceptable levels by appropriate frequency assignments. A transponder design is presented; it is greatly simplified by the application of a regional concept. System analysis shows that MSK modulation is appropriate for a high-capacity system because it conserves the frequency spectrum. Rain attenuation, a serious problem in this frequency band, is combatted with sufficient power margins and with coding. Link budgets, cost analysis, and weight and power calculations are also discussed. A satellite-routed FDMA system compares favorably in performance and cost with a satellite-switched TDMA system.
    Keywords: COMMUNICATIONS AND RADAR
    Type: AIAA PAPER 82-0447 , In: Communications Satellite Systems Conference; Mar 07, 1982 - Mar 11, 1982; San Diego, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Comparative study of FDMA, TDMA and hybrid 30/20 GHz satellite communications systems for small users (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: This study compares several satellite uplink and downlink accessing schemes for a Customer Premises Service. Four conceptual system designs are presented: Satellite-Routed FDMA, Frequency-Routed TDMA, Satellite-Switched TDMA, and Processor-Routed TDMA, operating in the 30/20 GHz band. The designs are compared on the basis of estimated satellite weight, power consumption, and cost. The system capacities are analyzed for a fixed multibeam coverage of CONUS. Analysis shows that the system capacity is limited by the available satellite resources and by the terminal size and cost.
    Keywords: COMMUNICATIONS AND RADAR
    Type: ICC ''82 - The digital revolution; International Conference on Communications; Jun 13, 1982 - Jun 17, 1982; Philadelphia, PA
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    On board processing for future satellite communications systems: Comparison of FDM, TDM and hybrid accessing schemes (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Several satellite uplink and downlink accessing schemes for customer premises service are compared. Four conceptual system designs are presented: satellite-routed frequency division multiple access (FDMA), satellite-switched time division multiple access (TDMA), processor-routed TDMA, and frequency-routed TDMA, operating in the 30/20 GHz band. The designs are compared on the basis of estimated satellite weight, system capacity, power consumption, and cost. The systems are analyzed for fixed multibeam coverage of the continental United States. Analysis shows that the system capacity is limited by the available satellite resources and by the terminal size and cost.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-167931 , NAS 1.26:167931 , MTR-8701
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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