Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 2005-2009  (3)
  • 1975-1979  (4)
  • 1955-1959  (2)
Source
Material
Years
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    THE CONFIGURATION OF CEVINE (1958)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 80 (1958), S. 1769-1769 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01540a069
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Digital Model Studies of Steady-State Radial Flow to Partially Penetrating Wells in Alluvial Plains (1977)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 15 (1977), S. 0 
    Details
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: A digital simulation model for the steady-state radial flow towards partially penetrating wells in the alluvial plains is presented. As the deposits in these plains are heterogenous with several good water-bearing formations crisscrossed with silty layers, the deposits are treated as a single anisotropic aquifer with water-table conditions prevailing. The iterative alternate direction implicit technique is used for the solution of the steady-state flow. The digital simulation model is used to study the effects of anisotropy, screen setting, and screen length on the discharge per unit length of screen; and in evaluating the errors involved in determining lateral permeability from distance-drawdown data. The digital simulation model is applied to field pump-test data for purposes of identification of aquifer anisotropy and radius of influence of well, and in evaluation of errors in determining lateral permeability from distance-drawdown data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6584.1977.tb03167.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Type-Curve Analysis of Time-Draw down Data for Partially Penetrating Wells in Unconfined Anisotropic Aquifers (1978)
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 16 (1978), S. 0 
    Details
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: With the aid of a computer, and using an iterative alternating-direction implicit method, a numerical solution is sought for the unsteady-state radial flow to partially penetrating wells pumping at a constant rate from an unconfined anisotropic aquifer. These solutions are used to generate a series of theoretical type curves valid for individual aquifer-test situations characterized by particular combinations of two constants Q = (Pr/Pz) (m/rw)2 and C2= (Sy/Ssm) and particular well penetration. The aquifer-test data requirements are the time-drawdown data and at least two pairs of observation wells, one of the pair tapping well-screen depths and the other tapping water-table depths. The parameters that are identified are the lateral permeability, vertical permeability, specific storage and specific yield of the aquifer. The use of the type curves is illustrated by an example.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-6584.1978.tb03245.x
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Ultrasonic Characterization of Silver Nanoparticles (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Journal of metastable and nanocrystalline materials Vol. 23 (Jan. 2005), p. 271-274 
    Details
    ISSN: 1422-6375
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Nanoparticles exhibit unusual properties in contrast with their bulk properties dueto small particle size and quantum confinement. In the present work, ultrasonic velocity and density measurements have been carried out in solutions of silver nanoparticles in micellar dispersion of cetyl tri-metyl ammonium bromide, CTAB. Ultrasonic velocity measurements at different concentrations of surfactant and temperatures were carried out using Sing-Around technique, operated at 2MHz. It is observed that ultrasonic velocity and adiabatic compressibility show abnormal behaviour with increase in concentration of CTAB in the solution, indicating the existence of the phase separations in nano-colloidal solution
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/43/transtech_doi~10.4028%252Fwww.scientific.net%252FJMNM.23.271.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Self-Diffusion of Iron in Nano-Crystalline Iron Nitride (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 480-481 (Mar. 2005), p. 557-564 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/10/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.480-481.557.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    A Study of the Effect of Polymer Matrix on the Ultrasonic Propagation in Silver Nanoparticles (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Journal of metastable and nanocrystalline materials Vol. 23 (Jan. 2005), p. 319-322 
    Details
    ISSN: 1422-6375
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In the present work, ultrasonic velocity measurements have been carried out in solutions of silver nanoparticles in the polymer matrix of poly(sodium, 4-styrenesulphonate) using Sing-Around technique, operated at 2 MHz.. The ultrasonic velocity of propagation shows an abnormal behaviour, indicating the existence of the phase separations in nano-colloidal solution. The effect of polymer is observed to be predominant in the phase separation at the lower concentrations of polymer in the mixture. At higher concentrations of the polymer in the mixture the phase separation seems to subside at higher temperature
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/43/transtech_doi~10.4028%252Fwww.scientific.net%252FJMNM.23.319.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Properties of spatial temperature derivatives in the atmospheric surface layer (1979)
    Springer
    Boundary layer meteorology 17 (1979), S. 101-118 
    Details
    ISSN: 1573-1472
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract A pair of parallel cold wires separated in either the vertical or lateral direction was used to obtain the three components θx, θy, θz of the temperature derivative in the streamwise, lateral and vertical directions, respectively. The average absolute skewness values of θx and θz are nonzero and approximately equal, while the skewness of θy is approximately zero. These results appear to be consistent with the presence of a large, three-dimensional organised structure in the surface layer. There is an apparent low-frequency contamination in the spectral density of θy and θz due mainly to small errors in estimating the sensitivity of the cold wires. The temperature derivatives were high-pass filtered, the filter being set to remove possible contributions from the large structure and to minimise low-frequency sensitivity contamination. The filtered rms ratios \~θx/\~θy and \~θx/\~θz were in the range 0.7 to 0.9, a result in qualitative agreement with that obtained in the laboratory boundary layer by Sreenivasan et al. (1977). The skewness of filtered θx or θz is negligible, consistent with local isotropy of small-scale temperature fluctuations and in support of the high wavenumber spectral isotropy discussed in Antonia and Chambers (1978).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00121939
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Die Glykoside der Samen von Calotropis procera R. Br. Glycoside und Aglykone, 154. Mitteilung (1955)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 38 (1955), S. 1809-1824 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Zwei Samenproben von Calotropis procera, R. Br. (Asclepiadaceae) (aus Eritrea bzw. Nyassaland stammend) gaben nach Einwirkung ihrer Enzyme die folgenden Glykoside und Aglykone: 1. Samenprobe von Eritrea: Coroglaucigenin (0,437%), Frugosid (0,0224%), Corotoxigenin (0,00665%) und ein neuer krist. Stoff, der Subst. B (0,00103%) genannt wird. Ein weiterer Stoff, der Subst. D genannt wird, konnte bisher nicht kristallisiert, sondern nur stark angereichert werden. 2. Samenprobe aus Nyassaland: Frugosid (0,231%), Subst. B (0,00082%) und ein Stoff, der höchstwahrscheinlich mit Calotropin (0,00094%) identisch ist. Subst. B zeigt im Papier-chromatogramm andere Laufstrecken als die verglichenen krist. Stoffe des Milchsafts von C. procera und gigantea von G. Hesse und Mitarb. Dabei zeigte sich, dass die letzteren Substanzen sich zum Teil im Papierchromatogramm nicht völlig einheitlich verhalten.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19550380718
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Performance Optimization of Metallized Solid Propellants (1978)
    Weinheim : Wiley-Blackwell
    Propellants, Explosives, Pyrotechnics 3 (1978), S. 150-155 
    Details
    ISSN: 0721-3115
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The object of this paper is to present a method for determining, for a typical metallized solid propellant system, the optimum combination of the reactants so as to arrive at a composition which can yield the maximum specific impulse. A direct approach of this kind for optimization of propellants does not appear to have been attempted so far. The optimization is sought to be carried out by expressing the theoretical specific impulse of the propellant under frozen flow conditions as a function of the different variables involved and maximizing the same, subject to the usual linear and non-linear constraints of mass balance, mass action, pressure balance, energy conservation and entropy conservation. The gradient projection technique due to Rosen has been adopted for carrying out this optimization. The method was programmed on the IBM 360/Model 44 Computer in FORTRAN IV language and the results of the computations for a typical metallized solid propellant system are presented in the paper. The investigations reveal that the gradient projection technique can be a useful computational device for determining the optimum composition and the corresponding performance parameters of propellant systems containing a large number of reactants and products with or without condensed phases.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prep.19780030505
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...