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  • 1
    Electronic Resource
    Electronic Resource
    Habitat dependent pollination success in a Cape orchid (1992)
    Springer
    Oecologia 91 (1992), S. 455-456 
    Details
    ISSN: 1432-1939
    Keywords: Orchidaceae ; Satyridae ; Habitat selection ; Pollination ; Fruit set
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We examined the pollination success of Disa uniflora (Orchidaceae) in two habitats. Plants occurring in a rocky gorge were far more successful than plants occurring in an adjacent open valley. More than 55% of flowers in the gorge were pollinated and set fruit compared with less than 25% of flowers in the valley. These differences are explained by the preference of Meneris tulbaghia (Satyridae), the exclusive pollinator of the orchid, for rocky, sheltered habitats. Fruit set of hand-pollinated flowers did not differ significantly between the two habitats, indicating that resources did not account for the variation in fruiting success.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00317637
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Insect pollination and floral mechanisms in South African species ofSatyrium (Orchidaceae) (1997)
    Springer
    Plant systematics and evolution 204 (1997), S. 195-206 
    Details
    ISSN: 1615-6110
    Keywords: Orchidaceae ; Satyrium ; Pollination ; adaptive radiation ; functional morphology ; Flora of southern Africa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The morphologically diverse flowers in the genusSatyrium reflect adaptations to a wide range of pollinators. Several recently discovered pollination systems inSatyrium are described and illustrated here; these include pollination by solitary bees, carrion flies, butterflies and moths. Two basic types of floral mechanism are recognised inSatyrium: (1) Species pollinated by lepidoptera and birds have long floral spurs and plate-like viscidia seated in lateral rostellum notches; these viscidia become attached to the proboscis or bill of the pollinator. (2) Species pollinated by flies and bees have relatively short floral spurs and globose viscidia seated in terminal rostellum notches; these viscidia become attached to the face, thorax or eyes of the pollinator.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00989205
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Long-proboscid fly pollination of two orchids in the Cape Drakensberg mountains, South Africa (1995)
    Springer
    Plant systematics and evolution 195 (1995), S. 169-175 
    Details
    ISSN: 1615-6110
    Keywords: Orchidaceae ; Disa ; Brownleea ; Nemestrinidae ; Prosoeca ; Pollination ; functional morphology ; long-proboscid flies ; Flora of southern Africa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Large hovering flies with elongated nectar-feeding mouthparts play an important role in the pollination of South African plants. Here we describe and illustrate the pollination of two long-spurred orchids —Disa oreophila H. Bolus subsp.erecta Linder andBrownleea macroceras Sond. — by the long-proboscid flyProsoeca ganglbaueri Lichtwardt (Nemestrinidae).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00989293
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Bird pollination in South African species ofSatyrium (Orchidaceae) (1996)
    Springer
    Plant systematics and evolution 203 (1996), S. 91-98 
    Details
    ISSN: 1615-6110
    Keywords: Orchidaceae ; Satyrium ; Nectarinia ; Pollination ; ornithophily ; nectar ; Flora of southern Africa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Field observations showed that three South African orchid species,Satyrium carneum, S. coriifolium andS. princeps, are pollinated by sunbirds. Foraging sunbirds insert their bills into the labellum chamber of the flowers and suck nectar from the labellum spurs with their tongues. The column overarches the entrance to the labellum and pollinaria become affixed to the upper mandible of the bill. Birds often attempt to remove pollinaria by rubbing their bills against a branch, but are mostly unsuccessful due to the large plate-like viscidia which attach the pollinaria very firmly to the bill. Other modifications for bird pollination in theseSatyrium species may include the red, carmine or orange colour of the flowers, sturdy inflorescence stems used for perching and large amounts of dilute nectar in the spurs. EachSatyrium species was pollinated by several species of sunbird, and despite some differences in flowering time, occasional hybrids occur at a site whereS. carneum andS. coriifolium share the same sunbird pollinators.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00985239
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  • 5
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    High Efficiency Large Area Polysilicon Solar Cells (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Large area (100 sq cm) polysilicon solar cells having efficiencies of up to 14.1% (100 mW/sq cm, 25 C) were fabricated and a detailed analysis was performed to identify the efficiency loss mechanisms. The 1-5 characteristics of the best cell were dominated by recombination in the quasi-neutral base due to the combination of minority carrier diffusion length and base resistivity. An analysis of the microstructural defects present in the material and their effect on the electrical properties is presented.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: JPL Proc. of the Flat-Plate Solar Array Proj. Res. Forum on High-Efficiency Crystalline Silicon Solar Cells; p 403-418
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Standardized performance tests of collectors of solar thermal energy-a flat-plate collector with a single-tube serpentine flow distribution (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: This preliminary data report gives basic test results of a flat-plate solar collector whose performance was determined in the NASA-Lewis solar simulator. The collector was tested over ranges of inlet temperatures, fluxes and coolant flow rates. Collector efficienty is correlated in terms of inlet temperature and flux level.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TM-X-73417 , E-8752
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Development of an integrated heat pipe-thermal storage system for a solar receiver (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The Organic Rankine Cycle (ORC) Solar Dynamic Power System (SDPS) is one of the candidates for Space Station prime power application. In the low Earth orbit of the Space Station approximately 34 minutes of the 94-minute orbital period is spent in eclipse with no solar energy input to the power system. For this period the SDPS will use thermal energy storage (TES) material to provide a constant power output. An integrated heat-pipe thermal storage receiver system is being developed as part of the ORC-SDPS solar receiver. This system incorporates potassium heat pipe elements to absorb and transfer the solar energy within the receiver cavity. The heat pipes contain the TES canisters within the potassium vapor space with the toluene heater tube used as the condenser region of the heat pipe. During the insolation period of the Earth orbit, solar energy is delivered to the heat pipe in the ORC-SDPS receiver cavity. The heat pipe transforms the non-uniform solar flux incident in the heat pipe surface within the receiver cavity to an essentially uniform flux at the potassium vapor condensation interface in the heat pipe. During solar insolation, part of the thermal energy is delivered to the heater tube and the balance is stored in the TES units. During the eclipse period of the orbit, the balance stored in the TES units is transferred by the potassium vapor to the toluene heater tube.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TM-101099 , NAS 1.15:101099 , DE88-003153 , LA-UR-87-3950 , CONF-8706254-1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Evaluation of flat-plate collector efficiency under controlled conditions in a solar simulator (1976)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The measured thermal efficiencies of 35 collectors tested with a solar simulator, along with the correlation equations used to generalize the data, are presented. The single correlation used is shown to apply to all the different types of collectors tested, including one with black paint and one cover, one with a selective surface coating and two covers, and an evacuated-tube collector. The test and correlation technique is also modified by using a shield so that collectors larger than the simulator test area can also be tested. This technique was verified experimentally for a shielded collector for which the collector shielded area was 31% of the solar simulator radiation area. A table lists all the collectors tested, the collector areas, and the experimental constants used to correlate the data for each collector.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TM-X-73520 , E-8932 , Intern. Solar Energy Soc. Conf.; Aug 15, 1976 - Aug 20, 1976; Winnipeg; Canada
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Baseline performance of solar collectors for NASA Langley solar building test facility (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The solar collector field contains seven collector designs. Before operation in the field, the experimental performances (thermal efficiencies) of the seven collector designs were measured in an indoor solar simulator. The resulting data provided a baseline for later comparison with actual field test data. The simulator test results are presented for the collectors as received, and after several weeks of outdoor exposure with no coolant (dry operation). Six of the seven collector designs tested showed substantial reductions in thermal efficiency after dry operation.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TM-X-3505 , E-9036
    Format: application/pdf
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  • 10
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    Standardized performance tests of collectors of solar thermal energy: An evacuated flatplate copper collector with a serpentine flow distribution (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Basic test results are given for a flat plate solar collector whose performance was determined in the NASA-Lewis solar simulator. The collector was tested over ranges of inlet temperatures, fluxes and one coolant flow rate. Collector efficiency is correlated in terms of inlet temperature and flux level.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-TM-X-73415 , E-9001
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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