ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

feed icon rss

Ihre E-Mail wurde erfolgreich gesendet. Bitte prüfen Sie Ihren Maileingang.

Leider ist ein Fehler beim E-Mail-Versand aufgetreten. Bitte versuchen Sie es erneut.

Vorgang fortführen?

Exportieren
Filter
  • Lunar and Planetary Science and Exploration  (9)
  • ASTRONOMY  (1)
  • INORGANIC AND PHYSICAL CHEMISTRY  (1)
  • pole-cutting  (1)
Sammlung
Schlagwörter
Verlag/Herausgeber
Erscheinungszeitraum
  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Agroforestry systems 31 (1995), S. 21-37 
    ISSN: 1572-9680
    Schlagwort(e): pole-cutting ; ethnobotany ; living fences ; indigenous species
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Beschreibung / Inhaltsverzeichnis: Résumé En pays Bamiléké, sur les hauts plateaux de l'ouest du Cameroun, les paysans utilisent la technique des macro-boutures pour la gestion de leur parc arboré. L'utilisation du macrobouturage suit un certain nombre de règles pour la récolte des boutures, leur conditionnement et leur plantation, qui dépendent de l'espèce bouturée. La fonction principale de la haie détermine la longueur et l'espacement des boutures, leur organisation et leur palissage avec du ‘bambou’ raphia. Cette technique contribue à la construction de haies séparant l'espace cultivé des parcs à bétail d'une part, et marquant les limites de leur concession d'autre part. Elle répond utilement à un certain nombre de besoins: marquage rapide de limites foncières; séparation élevage/agriculture; fourniture de la majeures parties des besoins de la famille en produits forestiers par une taille en tétard. Mais elle réquière une gestion fine des haies. Avec la diminution des troupeaux et l'abscence fréquente du chef de famille, les techniques de gestion du parc arboré évoluent.
    Notizen: Abstract In the Bamileke country (West Cameroon), farmers use pole-cutting practice for plantation tree and hedge management. Depending on the species, this practice follows certain rules for gathering, conditioning and planting of pole-cuttings. The main function of the living fences determines the length of the cuttings, the space between them, the hedge structure and its latticing with raffia ‘bamboo’. Pole-cutting practice enables farmers to set up pigs, goats and sheep enclosures in the crop fields, as well as to demarcate the family lots. Trees stemming from pole-cutting are pollarded to supply the family group with the majority of their wood product requirements. Pole-cutting practice fulfills the needs of several farmers such as rapid delimitation of land, animal enclosures, firewood, construction wood, timber and cutting production. However, this practice needs a fine hedge management. With decreasing sheep and goat herds and the frequent absence of the farmer, techniques of hedge management are changing.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 2
    Publikationsdatum: 2011-08-24
    Beschreibung: Volatile compounds in comets are the most pristine materials surviving from the time of formation of the Solar System, and thus potentially provide information about conditions that prevailed in the primitive solar nebula. Moreover, comets may have supplied a substantial fraction of the volatiles on the terrestrial planets, perhaps including organic compounds that played a role in the origin of life on Earth. Here we report the detection of hydrogen isocyanide (HNC) in comet Hyakutake. The abundance of HNC relative to hydrogen cyanide (HCN) is very similar to that observed in quiescent interstellar molecular clouds, and quite different from the equilibrium ratio expected in the outermost solar nebula, where comets are thought to form. Such a departure from equilibrium has long been considered a hallmark of gas-phase chemical processing in the interstellar medium, suggesting that interstellar gases have been incorporated into the comet's nucleus, perhaps as ices frozen onto interstellar grains. If this interpretation is correct, our results should provide constraints on the temperature of the solar nebula, and the subsequent chemical processes that occurred in the region where comets formed.
    Schlagwort(e): Lunar and Planetary Science and Exploration
    Materialart: Nature (ISSN 0028-0836); Volume 383; 6599; 418-20
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 3
    Publikationsdatum: 2011-08-24
    Beschreibung: We have developed a new photochemical model of Titan's atmosphere which includes all the important compounds and reactions in spherical geometry from the surface to 1240 km. Compared to the previous model of Yung et al. (1984), the most significant recent change in the reactions used is the updated methane dissociation scheme (Mordaunt et al. 1993). Moreover, the transfer of the solar radiation in the atmosphere and the photolysis rates have been calculated by using a Monte Carlo code. Finally, the eddy diffusion coefficient profile is adjusted in order to fit the mean vertical distribution of HCN retrieved from millimeter groundbased observations of Tanguy et al. (1990); using new values for the boundary flux of atomic nitrogen (Strobel et al. 1992). We have run the model in both steady-state and diurnal modes, with 62 species involved in 249 reactions. There is little difference between diurnal and steady-state results. Overall our results are in a closer agreement with the abundances inferred from the Voyager infrared measurements at the equator than the Yung et al. results. We find that the catalytic scheme for H recombination invoked by Yung et al. only slightly improves the model results and we conclude that this scheme is not essential to fit observations.
    Schlagwort(e): INORGANIC AND PHYSICAL CHEMISTRY
    Materialart: Icarus (ISSN 0019-1035); 113; 1; p. 2-26
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 4
    Publikationsdatum: 2011-08-24
    Beschreibung: Spectra of the North Equatorial Belt of Jupiter were obtained in March 1992 at an unapodized resolution of 0.1/cm between 2450 and 2600/cm with the Fourier Transform Spectrometer at the 3.6 m Canada-France-Hawaii Telescope (CFHT) on Mauna Kea. Several emissions from the nu(sub 2) band of H3(+) were detected. The excitation temperature derived from the relative intensities of these emissions averaged over a wide range of longitudes is 800 +/- 100 K, and the H3(+) column density is 1.56(sup +1.0)(sub -0.5) x 10(exp 11)/sq. cm. In addition, several strong absorption features due to (13)CH4 were observed. A comparison between (12)CH4 and (13)CH4 absorptions allowed us to obtain a new measurement of the C-12/C-13 ratio. We found that this ratio, estimated for the first time in this spectral range, is 89 (+/- 25), in agreement with the terrestrial value.
    Schlagwort(e): ASTRONOMY
    Materialart: Planetary and Space Science (ISSN 0032-0633); 42; 5; p. 391-399
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 5
    Publikationsdatum: 2011-08-24
    Beschreibung: Deuterated water (HDO) was detected in comet C/1995 O1 (Hale-Bopp) with the use of the James Clerk Maxwell Telescope on Mauna Kea, Hawaii. The inferred D/H ratio in Hale-Bopp's water is (3.3 +/- 0.8) x 10(-4). This result is consistent with in situ measurements of comet P/Halley and the value found in C/1996 B2 (Hyakutake). This D/H ratio, higher than that in terrestrial water and more than 10 times the value for protosolar H2, implies that comets cannot be the only source for the oceans on Earth.
    Schlagwort(e): Lunar and Planetary Science and Exploration
    Materialart: Science (ISSN 0036-8075); Volume 279; 5352; 842-4
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 6
    Publikationsdatum: 2011-08-24
    Beschreibung: Deuterated hydrogen cyanide (DCN) was detected in a comet, C/1995 O1 (Hale-Bopp), with the use of the James Clerk Maxwell Telescope on Mauna Kea, Hawaii. The inferred deuterium/hydrogen (D/H) ratio in hydrogen cyanide (HCN) is (D/H)HCN = (2.3 +/- 0.4) x 10(-3). This ratio is higher than the D/H ratio found in cometary water and supports the interstellar origin of cometary ices. The observed values of D/H in water and HCN imply a kinetic temperature 〉/=30 +/- 10 K in the fragment of interstellar cloud that formed the solar system.
    Schlagwort(e): Lunar and Planetary Science and Exploration
    Materialart: Science (ISSN 0036-8075); Volume 279; 5357; 1707-10
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 7
    Publikationsdatum: 2011-08-24
    Beschreibung: The atmospheric circulation of Titan is investigated with a general circulation model. The representation of the large-scale dynamics is based on a grid point model developed and used at Laboratoire de Meteorologie Dynamique for climate studies. The code also includes an accurate representation of radiative heating and cooling by molecular gases and haze as well as a parametrization of the vertical turbulent mixing of momentum and potential temperature. Long-term simulations of the atmospheric circulation are presented. Starting from a state of rest, the model spontaneously produces a strong superrotation with prograde equatorial winds (i.e., in the same sense as the assumed rotation of the solid body) increasing from the surface to reach 100 m sec-1 near the 1-mbar pressure level. Those equatorial winds are in very good agreement with some indirect observations, especially those of the 1989 occultation of Star 28-Sgr by Titan. On the other hand, the model simulates latitudinal temperature contrasts in the stratosphere that are significantly weaker than those observed by Voyager 1 which, we suggest, may be partly due to the nonrepresentation of the spatial and temporal variations of the abundances of molecular species and haze. We present diagnostics of the simulated atmospheric circulation underlying the importance of the seasonal cycle and a tentative explanation for the creation and maintenance of the atmospheric superrotation based on a careful angular momentum budget.
    Schlagwort(e): Lunar and Planetary Science and Exploration
    Materialart: Icarus (ISSN 0019-1035); Volume 117; 2; 358-74
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 8
    Publikationsdatum: 2018-06-08
    Beschreibung: We present the far-infrared spectrum of Jupiter that was measured with the Short and Long Wavelength Spectrometers aboard the Infrared Space Observatory.
    Schlagwort(e): Lunar and Planetary Science and Exploration
    Materialart: Jupiter After Galileo and Cassini -- A Conference About the Giant Planets; Lisbon; Portugal
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 9
    Publikationsdatum: 2018-06-08
    Schlagwort(e): Lunar and Planetary Science and Exploration
    Materialart: Division for Planetary Sciences Meeting of the American Astronomical Society; Monterey, CA; United States
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 10
    Publikationsdatum: 2019-07-17
    Beschreibung: The formation of the giant planets is one of the most fundamental questions in solar system exploration. Understanding the process that led to the creation of Jupiter is essential to understanding the nature of the primordial solar nebula, and the formation of our solar system and others currently being discovered. Data from Galileo combined with HST and Ulysses results validated our basic understanding of Jupiter as a giant planet whose gaseous envelope consists of solar nebula gas enriched in elements heavier than He by in falling icy planetesimals. However, the current Galileo Probe data set does not itself allow firm conclusions about the original planetesimal composition or the process of giant planet formation - we crucially need the O and N abundances that Galileo could not determine. We propose a new and simple concept capable of determining these abundance in Jupiter plus substantial gravity science. Additional information is contained in the original extended abstract.
    Schlagwort(e): Lunar and Planetary Science and Exploration
    Materialart: Forum on Innovative Approaches to Outer Planetary Exploration 2001-2020; 12; LPI-Contrib-1084
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
Schließen ⊗
Diese Webseite nutzt Cookies und das Analyse-Tool Matomo. Weitere Informationen finden Sie hier...