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  • 1985-1989  (2)
  • 25.70.Cd  (1)
  • equation of state  (1)
  • Antiaggregating drugs
  • Ehrlich ascites tumor
  • Polymer and Materials Science
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Material
Years
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Positron lines from subcritical heavy ion-atom collisions (1987)
    Springer
    The European physical journal 328 (1987), S. 129-145 
    Details
    ISSN: 1434-601X
    Keywords: 14.60.Cd ; 25.70.Cd ; 25.70.Ef
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Positron lines were observed in heavy ion-atom collisions at bombarding energies close to the Coulomb barrier in subcritical systems with the sum of the atomic numbers of the colliding nucleiZ u =Z 1+Z 2 being smaller thanZ u =172. Each collision system, studied,208Pb +208Pb(Zu=164),238U+181Ta(Zu=165), and238Au(Zu=171), exhibits the emission of two positron lines withZ u -independent c.m. energies of ∼ 258 keV and ∼ 340 keV, and with widths of about 30 keV, superimposed on continuous positron spectra from nuclear pair decay and pair emission induced by the time changing Coulomb field of the collision. The production cross section of thee +-lines rises with a high power ofZ u (ocZ u 22), which is comparable to theZ u 20-dependence for the collision induced positrons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01290655
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A new method for optimizing the structure of thermodynamic correlation equations (1989)
    Springer
    International journal of thermophysics 10 (1989), S. 1103-1126 
    Details
    ISSN: 1572-9567
    Keywords: correlation equation ; equation of state ; least-squares principle ; optimization method ; search method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An optimization strategy is presented for optimizing the structure of empirical thermodynamic correlation equations. Based on a comprehensive functional expression for the physical dependence considered, which is called a “bank of terms,” the new procedure optimizes the structure and the length of the equation as well. The application of this method results in an equation which meets the quality wanted for representing the experimental data with the lowest number of fitted coefficients. The procedure can be used for the determination of the structure of any equation where the method of the linear least squares is applicable. A detailed description of the algorithm is given which includes values for the control parameters for different applications in the field of thermodynamics (vapor pressure equations, equations of state, etc.) and also for applications in other fields. The optimization steps are described using an equation which represents a relationship between variables in a general form. It is demonstrated how even the complex problem of the optimization of a fundamental equation for the Heimholtz energy can be written in terms of this general equation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00500566
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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