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  • LUNAR AND PLANETARY EXPLORATION  (59)
  • Isoptera
  • OCEANOGRAPHY
  • 1
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    The imaging photopolarimeter experiment on Pioneer 11 (1975)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: For 2 weeks continuous imaging, photometry, and polarimetry observations were made of Jupiter and the Galilean satellites in red and blue light from Pioneer 11. Measurements of Jupiter's north and south polar regions were possible because the spacecraft trajectory was highly inclined to the planet's equatorial plane. One of the highest resolution images obtained is presented here along with a comparison of a sample of our photometric and polarimetric data with a simple model. The data seem consistent with increased molecular scattering at high latitudes.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: Science; 188; May 2
    Format: text
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  • 2
    Digitale Medien
    Digitale Medien
    Soldier-specific chemicals of the termiteCurvitermes strictinasus Mathews (Isoptera, Nasutitermitinae) (1981)
    Springer
    Journal of chemical ecology 7 (1981), S. 127-133 
    Details
    ISSN: 1573-1561
    Schlagwort(e): Isoptera ; Nasutitermitinae ; isolation ; identification ; Curvitermes strictinasus (Mathews) ; defense secretion
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract The defense secretion of the soldier termites ofCurvitermes strictinasus Mathews has been analyzed. Seven components have been isolated and identified, including limonene, terpinolene,p-cymen-8-ol, tridecan-2-one, tridecen-2-onecis,trans-farnesal, andtrans,trans-farnesal.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00988640
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  • 3
    Digitale Medien
    Digitale Medien
    Chemical composition of the frontal gland secretion ofSyntermes soldiers (Isoptera, Termitidae) (1981)
    Springer
    Journal of chemical ecology 7 (1981), S. 135-145 
    Details
    ISSN: 1573-1561
    Schlagwort(e): Isoptera ; Nasutitermitinae ; Syntermes species ; defensive secretion ; isolation ; identification ; terpenoid compounds
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract The defensive secretions from the frontal glands of soldier termites of the genusSyntermes contain similar mixtures of mono- and sesquiterpene hydrocarbons. The major components inS. dirus, S. molestus, S. brevimalatus, S. peruanus, and a new species (Syntermes sp. n), iscis-β-ocimene. A substantial amount of aristolochene is found inSyntermes sp. n. and is present at lower levels in all the other species;S. brevimalatus contains onlycis-β-ocimene and aristolochene. The four other species also contain minor amounts of epi-α-selinene and germacrene A. The latter compound has been identified on the basis of its rearrangement product β-elemene. The termiteS. grandis differed markedly from the otherSyntermes species in that no terpenoid components were found in the soldier extract. With the obvious exception ofS. grandis, the same soldier-specific mono- and sesquiterpenes occurred in all species. The total amount of secretion per unit weight of soldiers varies with the species and is inversely proportional to the development of the mandibular apparatus. InS. molestus smaller gland size is compensated for by a greater number of soldiers foraging trails.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00988641
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  • 4
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    Marine research using data from TOPEX/Poseidon (1991)
    In:  CASI
    Details
    Publikationsdatum: 2006-06-13
    Beschreibung: The Proudman Oceanographic Laboratory (POL), the Institute of Oceanographic Sciences Deacon Laboratory (IOSDL), and the British National Space Centre (BNSC) plan to use radar altimeter data from the TOPEX/POSEIDON mission in five main areas of research. These are: (1) investigation of variations in Southern Ocean sea levels and circulation; (2) related numerical modeling and data assimilation; (3) global and regional ocean tides; (4) North Sea and northeast Atlantic studies; and (5) winds and waves. Each one of these topics is described briefly below while more information can be extracted from the United Kingdom response to the TOPEX/POSEIDON Announcement of Opportunity.
    Schlagwort(e): OCEANOGRAPHY
    Materialart: JPL, TOPEX(Poseidon Science Investigations Plan; p 169-173
    Format: text
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  • 5
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    A model of impulsive acceleration and transport of energetic particles in Mercury's magnetosphere (1986)
    In:  Other Sources
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    Publikationsdatum: 2011-08-19
    Beschreibung: A qualitative model of substorm processes in the Mercury magnetosphere is presented based on Mariner 10 observations obtained in 1974-1975. The model is predicated on close analogies observed with the terrestrial case. Particular emphasis is given to energetic particle phenomena as observed by Mariner on March 29, 1974. The suggestion is supported that energetic particles up to about 500 keV are produced by strong induced electric fields at 3 to about 6 Mercury radii in the Hermean tail in association with substorm neutral line formation. The bursts of energetic particles produced are, in this model, subsequently confined on closed field lines near Mercury and drift adiabatically on quasi-trapped orbits for many tens of seconds. Such gradient and curvature drift of the particles can explain prominent periodicities of 5-10 s seen in the Mariner for greater than 170-keV electron flux profiles.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: Journal of Geophysical Research (ISSN 0148-0227); 91; 8742-874
    Format: text
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  • 6
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    Radio-interferometric imaging of the subsurface emissions from the planet Mercury (1987)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-19
    Beschreibung: The distribution of total and polarized intensities from Mercury's subsurface layers have been mapped using VLA observations. The first detection of a hot pole along the Hermean equator is reported and modeled as black-body reradiation from preferential diurnal heating. These observations appear to rule out any internal sources of heat within Mercury. Polarized emission from the limb of the planet is also found, and is understood in terms of the dielectric properties of the Hermean surface.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: Nature (ISSN 0028-0836); 329; 224-226
    Format: text
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  • 7
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    Fluvial valleys and Martian palaeoclimates (1989)
    In:  Other Sources
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    Publikationsdatum: 2011-08-19
    Beschreibung: Theoretical models of early Martian atmospheric evolution describe the maintenance of a dense CO2 atmosphere and a warm, wet climate until the end of the heavy-bombardment phase of impacting. However, the presence of very young, earthlike fluvial valleys on the northern flank of Alba Patera conflicts with this scenario. Whereas the widespread ancient Martian valleys generally have morphologies indicative of sapping erosion by the slow outflow of subsurface water, the local Alba valleys were probably formed by surface-runoff processes. Because subsurface water flow might be maintained by hydrothermal energy inputs and because surface-runoff valleys developed late in Martian history, it is not necessary to invoke drastically different planet-wide climatic conditions to explain valley development on Mars. The Alba fluvial valleys can be explained by hydrothermal activity or outflow-channel discharges that locally modified the atmosphere, including precipitation and local overland flow on low-permeability volcanic ash.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: Nature (ISSN 0028-0836); 341; 514-516
    Format: text
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  • 8
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    Aircraft and satellite measurement of ocean wave directional spectra using scanning-beam microwave radars (1985)
    In:  Other Sources
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    Publikationsdatum: 2011-08-19
    Beschreibung: A microwave radar technique for remotely measuring the vector wave number spectrum of the ocean surface is described. The technique which employs short-pulse, noncoherent radars in a conical scan mode near vertical incidence, is shown to be suitable for both aircraft and satellite application, the technique was validated at 10 km aircraft altitude, where we have found excellent agreement between buoy and radar-inferred absolute wave height spectra.
    Schlagwort(e): OCEANOGRAPHY
    Materialart: Journal of Geophysical Research (ISSN 0148-0227); 90; 987-1004
    Format: text
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  • 9
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    Channels and valleys on Mars (1983)
    In:  Other Sources
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    Publikationsdatum: 2011-08-18
    Beschreibung: Tentative conclusions about the origins of channels and valleys on Mars based on the consensus of investigators who have studied the problem are presented. The morphology of outflow channels is described in detail, and the morphology, distribution, and genesis of Martian valleys are addressed. Secondary modification of channels and valleys by mass-wasting phenomena, eolian processes, cratering, and mantling by lava flows is discussed. The physics of the flows needed to account for the immense volumes of Martian outflow channels is considered in detail, including the possible influence of debris flows and mudflows, glaciers, and ice sheets. It is concluded that Mars once probably possessed an atmosphere with higher temperatures and pressures than at present which played an essential role in an active hydrological cycle.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: Geological Society of America, Bulletin (ISSN 0016-7606); 94; 1035-105
    Format: text
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  • 10
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    Evolution of the global water cycle on Mars: The geological evidence (1993)
    In:  CASI
    Details
    Publikationsdatum: 2013-08-31
    Beschreibung: The geological evidence for active water cycling early in the history of Mars (Noachian geological system or heavy bombardment) consists almost exclusively of fluvial valley networks in the heavily cratered uplands of the planet. It is commonly assumed that these landforms required explanation by atmospheric processes operating above the freezing point of water and at high pressure to allow rainfall and liquid surface runoff. However, it has also been documented that nearly all valley networks probably formed by subsurface outflow and sapping erosion involving groundwater outflow prior to surface-water flow. The prolonged ground-water flow also requires extensive water cycling to maintain hydraulic gradients, but is this done via rainfall recharge, as in terrestrial environments?
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: Lunar and Planetary Inst., Workshop on Early Mars: How Warm and How Wet?, Part 1; p 1-2
    Format: application/pdf
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