ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

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
    Numerical Simulation of Low Mach Number Reactive Flows (1997)
    Springer
    Journal of scientific computing 12 (1997), S. 139-167 
    Details
    ISSN: 1573-7691
    Schlagwort(e): Combustion ; numerical simulation ; opposed jet flames ; porous particle combustion ; splitting method
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Informatik
    Notizen: Abstract A new formulation for the numerical solution of low Mach number compressible flow problems is presented and analyzed. In this formulation the thermal part (energy and species equations) is solved implicitly and decoupled from the momentum equation, whereas the hydrodynamic part (momentum-continuity) is advanced in time using a high order splitting approach which results in overall high order accuracy in time and minimal errors in mass conservation. These errors are analyzed using both analytical tools and benchmark numerical examples. Results from two-dimensional simulations with one-step global reaction in opposed jet flame and porous particle configurations are also presented.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1025669715376
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 2
    Digitale Medien
    Digitale Medien
    Rearrangement of the main chain of the organocobalt polymers. 2. Synthesis of novel poly(pyridine-diyl-alt-biphenyl-4,4′-diyl) by the reaction with nitriles (1) (1997)
    Springer
    Polymer bulletin 39 (1997), S. 415-422 
    Details
    ISSN: 1436-2449
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Abstract. The polymers 3 having pyridine moieties in the main chain were synthesized by the reaction of the organocobalt polymers 1 having cobaltacyclopentadiene moieties in the main chain with various nitriles 2. When brown colored 1 and excess 2 were heated in tetrahydrofuran at 80 °C for 24 h and then at 150 °C for 12 h in a sealed tube, the polymers 3 were obtained by the precipitation with methanol in good yields. From the spectroscopic measurements, the resulting polymers 3 were found to contain 35 – 90% of the pyridine moieties depending on the structures of 1.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s002890050167
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 3
    Digitale Medien
    Digitale Medien
    A developmental study of constitutive heterochromatin in Microtus agrestis (1971)
    Springer
    Chromosoma 32 (1971), S. 237-250 
    Details
    ISSN: 1432-0886
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Abstract In the vole, Microtus agrestis, the constitutive heterochromatin is largely restricted to the giant sex chromosomes but varies in its degree of condensation in various cell types. In the cleavage embryos and fibroblasts it formed one or two long and extended heterochromatic fibers, in hepatocytes it formed two large and diffuse masses and in neurons, spermatogonia and oogonia it formed two large and compact masses. The basic patterns of all differentiated cells were essentially unchanged throughout development.—At all stages of development and in cells of all types, mitotic nuclei displayed two large heteropycnotic chromosomes in prophase and persistent condensation in telophase. Apposition and delayed separation of chromatids of the giant chromosomes was also observed in metaphase and anaphase, respectively. During the first meiotic prophase of spermatocytes and oocytes, the giant chromosomes were also heteropycnotic.—The results strongly suggest that constitutive heterochromatin is localized in the same chromosomes throughout development and represents a specific entity.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00284837
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 4
    Digitale Medien
    Digitale Medien
    Calcitonin heterogeneity:in vivo andin vitro studies (1976)
    Springer
    Calcified tissue international 22 (1976), S. 298-302 
    Details
    ISSN: 1432-0827
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02064083
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 5
    Digitale Medien
    Digitale Medien
    Cytological variations in the constitutive heterochromatin of Microtus agrestis (1971)
    Springer
    Chromosoma 35 (1971), S. 117-124 
    Details
    ISSN: 1432-0886
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Abstract In the field vole, Microtus agrestis, most of the constitutive heterochromatin is localized in the giant chromosomes. A detailed examination of a large number of adult cell types reveals that this chromatin is actually present as a heterochromatic fiber in all interphase nuclei. Depending upon the cell types, however, the fiber shows varying degrees of condensation and folding ranging from a very long and extended fiber to a large compact chromocenter. The number of cell types with giant chromocenters was less commonly observed than those with extended fibers. This explains why some cells were previously thought to be devoid of heterochromatin.—The results of this investigation strongly indicate that constitutive heterochromatin represents a unique nuclear entity.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00285732
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 6
    Digitale Medien
    Digitale Medien
    Calcitonin secretion in renal disease (1976)
    Springer
    Calcified tissue international 22 (1976), S. 154-157 
    Details
    ISSN: 1432-0827
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02064057
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 7
    Digitale Medien
    Digitale Medien
    Comparative thermal ecology of two lizards (1980)
    Springer
    Oecologia 44 (1980), S. 171-176 
    Details
    ISSN: 1432-1939
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary In a habitat judged to be energetically costly for thermoregulation, mean body temperatures (MBT's) ofAnolis sagrei are significantly higher than those ofA. distichus. As indexed by the slope of the regression of body temperatures (T b ) on substrate temperature (T s ),A. sagrei is more dependent upon environmental temperatures thanA. distichus. In a habitat judged to be less costly for thermoregulation and where interspecific competition for perch sites may be less, MBT's ofA. sagrei are significantly higher, proportionally more lizards occupy sunny perches, and the slope of the regression of T b on T s is significantly less, than for conspecifics in the costly habitat. As indexed by length-specific fat body weights, well-nourished lizards in the costly habitat have T b 's which are independent of environmental temperature; T b 's of poorly-nourished lizards are highly dependent upon environmental temperature. This relationship does not hold for lizards in the low-cost habitat. These results corroborate the hypothesis that energetic costs are important in controlling the extent to which lizards thermoregulate. In high-cost habitats lizards thermoregulate less precisely than in low-cost habitats. Lizards that exploit the habitat as if it were highly productive thermoregulate more precisely than lizards that exploit the environment as if it were of low productivity.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00572675
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 8
    Digitale Medien
    Digitale Medien
    On the breakup of molten polymeric threads (1975)
    Springer
    Rheologica acta 14 (1975), S. 427-435 
    Details
    ISSN: 1435-1528
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Physik
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Der Zerfall von Fäden mit hoher Viskosität wird durch Anwendung der Bewegungsgleichungen und der Kontinuitätsgleichung untersucht. Die Analyse basiert auf der Annahme, daß der Fadenzerfall durch kleine Störungen hervorgerufen wird, die sich längs des Fadens ausbreiten. Die vorliegende Untersuchung liefert nur ein qualitatives Ergebnis. Eine quantitative Analyse würde die Auswertung von Kontinuitäts-, Bewegungs- und Energiegleichungen zur Voraussetzung haben. Sie macht aber deutlich, wie die Stabilitätsänderungen von den mechanischen Eigenschaften der Flüssigkeit, der Dehngeschwindigkeit und den Dimensionen des dem Spinnprozeß unterworfenen Fadens abhängen. Der Fadenzerfall kann qualitativ durch die zwischen dem Auftreten der Störung und dem Zerfall liegende Zeitdauer, die „Zerfallszeit“ gekennzeichnet werden. Die elastischen Eigenschaften von Polymerschmelzen bewirken eine Vergrößerung dieser Zerfallszeit, die Zunahme der Dehngeschwindigkeit dagegen eine Verringerung.
    Notizen: Summary The breakup of high viscosity threads was analyzed by the application of the equations of motion and continuity. The analysis is based on the assumption that the thread breakup results from small disturbances developing along the thread. The present study has only qualitative value, quantitative analysis requires the application of equations of continuity, motion and energy. However, the analysis clearly demonstrates changes in the stability of the thread resulting from the mechanical properties of the liquid as well as the extension rate and the dimensions of the thread subjected to the spinning process. The thread breakup can be characterized qualitatively by the time which elapses from the application of the disturbance on the thread until its breakup. This is the “breakup time”. Elastic properties of the molten polymer increase the breakup time of the thread. An increase in the extension rate of the thread reduces the breakup time.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01527138
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 9
    Digitale Medien
    Digitale Medien
    Soliton gauge states and T-duality of closed bosonic string compatified on torus (1999)
    Springer
    The European physical journal 7 (1999), S. 669-672 
    Details
    ISSN: 1434-6052
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract. We study soliton gauge states in the spectrum of bosonic string compatified on torus. The enhenced Kac-Moody gauge symmetry, and thus T-duality, is shown to be related to the existence of these soliton gauge states in some moduli points.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s100529900951
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 10
    Digitale Medien
    Digitale Medien
    Young's modulus of cold- and hot-rolled (Al2O3)p-Al composite (1994)
    Springer
    Journal of materials science 29 (1994), S. 4901-4905 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract The Young's modulus of hot-rolled Al alloy reinforced with Al2O3 particulates, (Al2O3)p-Al composite, is measured using the dynamic sonic resonance test method. The variation in the moduli of cold- and hot-rolled composites, as a function of the reduction ratio, is compared. Although both cold and hot rolling result in more uniform distribution of the particulates, hot rolling causes less damage to the reinforcements, resulting in more isotropic composites possessing a higher Young's modulus. These observed variations in the Young's modulus with respect to reduction ratio are analysed on the basis of the microstructural changes due to the rolling and T6 heat-treating operations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00356541
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
Schließen ⊗
Diese Webseite nutzt Cookies und das Analyse-Tool Matomo. Weitere Informationen finden Sie hier...