Bibliothek

X
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
  • 1
    Digitale Medien
    Digitale Medien
    Small-scale clumping in molecular clouds (1989)
    Springer
    The astronomy and astrophysics review 1 (1989), S. 141-176 
    Details
    ISSN: 1432-0754
    Schlagwort(e): molecular clouds ; star formation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Summary This review consists of five sections. In the introduction, we briefly review the development of the study of molecular clouds. In the second section, we review the theories of molecular cloud structure and compare these predictions with the statistical properties of the clouds. In Sect. 3 we give an overview of current approaches to determinations of mass and local density in clouds. In the fourth part, we discuss the observations of a selected sample of individual sources. The emphasis here is on high resolution studies of regions of star formation. The final section contains a discussion of instrumental limitations and mentions some future developments.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00872714
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 2
    Digitale Medien
    Digitale Medien
    Molecular scene analysis: the integration of direct-methods and artificial-intelligence strategies for solving protein crystal structure (1993)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 49 (1993), S. 168-178 
    Details
    ISSN: 1399-0047
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Notizen: A knowledge-based approach to crystal structure determination is presented. The approach integrates direct-methods and artificial-intelligence strategies to rephrase the structure determination process as an exercise in scene analysis. A general joint probability distribution framework, which allows the incorporation of isomorphous replacement, anomalous scattering and a priori structural information, forms the basis of the direct-methods strategies. The accumulated knowledge on crystal and molecular structures is exploited through the use of artificial-intelligence strategies, which include techniques of knowledge representation, search and machine learning.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S090744499200917X
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 3
    Digitale Medien
    Digitale Medien
    Vasopressins and the Increase of Water and Electrolyte Excretion by Sheep, Cattle and Camels (1967)
    [s.l.] : Nature Publishing Group
    Nature 214 (1967), S. 979-981 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Camels and Merino sheep under tropical arid conditions are more sensitive to the action of vasopressin than cattle, dogs or men. The hormone increases the output of potassium from the kidney even when the animals are artificially depleted of potassium. Arginine vasopressin has the same effect on ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/214979a0
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 4
    Digitale Medien
    Digitale Medien
    Detection of strong methanol masers towards galactic H II regions (1987)
    [s.l.] : Nature Publishing Group
    Nature 326 (1987), S. 49-51 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] The observations were carried out in July 1985 and April-May 1986 with the National Radio Astronomy Observatory (NRAO) 140-foot telescope in Green Bank. In July 1985, the data were acquired using a double-beam-switching technique. Total power mode or frequency switching was used during the 1986 ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/326049a0
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 5
    Digitale Medien
    Digitale Medien
    Carbon chain molecules in interstellar clouds (1979)
    Springer
    Astrophysics and space science 65 (1979), S. 83-93 
    Details
    ISSN: 1572-946X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A survey of the distribution of long carbon chain molecules in interstellar clouds shows that their abundance is correlated. The various formation schemes for these molecules are discussed. We conclude that the ion-molecule type formation mechanisms are more promising than their competitors. They have also the advantage of allowing predictions which can be tested by observations. Acetylene C2H2 and diacetylene HCCCCH, may be very abundant in interstellar clouds.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00643491
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 6
    Digitale Medien
    Digitale Medien
    The massive hot core associated with G31.41+0.31 (1995)
    Springer
    Astrophysics and space science 224 (1995), S. 173-175 
    Details
    ISSN: 1572-946X
    Schlagwort(e): Molecular Lines ; Hot Core ; Massive Star Formation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We have used the IRAM Plateau de Bure Interferometer to observe the ground state and vibrationally excited lines of Methyl Cyanide towards the UCHII region G31.41+0.31. We also obtained a map of the continuum emission at a frequency of 110 GHz. We detect a hot molecular core in the emission both of methyl cyanide and of the 110 GHz continuum. We estimate a temperature of 200 K and a mass of 1000 M⊙ for this compact massive region. We also detect a velocity gradient or shift across the methyl cyanide core whose origin could be due to rotation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00667840
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 7
    Digitale Medien
    Digitale Medien
    Identification of a collapsing protostar (1994)
    Springer
    Astrophysics and space science 212 (1994), S. 139-145 
    Details
    ISSN: 1572-946X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The globular molecular cloud B335 contains a single, deeply embedded, far-infrared source. Our recent observations of H2CO and CS lines toward this source provide direct kinematic evidence for collapse. Both the intensity and detailed shape of the line profiles match those expected from inside-out collapse inside a radius of 0.036 pc. The collapse began about 1.5 × 105 years ago, similar to the onset of the outflow. The mass accretion rate is about 10 times the outflow rate, and about 0.4M ⊙ should have now accumulated in the star and disk. Because B335 rotates only very slowly, any disk would still be very small (about 3 AU). The accretion luminosity should be adequate to power the observed luminosity. Consequently, we believe that B335 is indeed a collapsing protostar.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00984517
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
Schließen ⊗
Diese Webseite nutzt Cookies und das Analyse-Tool Matomo. Weitere Informationen finden Sie hier...