Now showing items 1-6 of 6

  • Collectivity in Heavy Nuclei in the Shell Model Monte Carlo Approach 

    Authors:Özen, Cem; Alhassid, Yoram; Nakada, Hitoshi
    Publisher and Date:(EDP Sciences, 2014)
    The microscopic description of collectivity in heavy nuclei in the framework of the configuration-interaction shell model has been a major challenge. The size of the model space required for the description of heavy nuclei prohibits the use of conventional diagonalization methods. We have overcome this difficulty by using the shell model Monte Carlo (SMMC) method which can treat model spaces that are many orders of magnitude larger than those that can be treated by conventional methods. We identify ...

  • Dynamic Multi Threshold Priority Packet Scheduling Algorithms 

    Authors:Daǧ, Tamer; Uzungenç, Sezer
    Publisher and Date:(EDP Sciences, 2015)
    Packet scheduling algorithms are developed in order to use shared transmission resources efficiently. Various application packets such as real and non-real time packets might have different QoS requirements and traditional scheduling algorithms might be insufficient to respond to the applications needs. In this paper two packet scheduling algorithms are proposed to overcome this problem: Dynamic multi threshold priority packet scheduling (DMTPS) and dynamic multi threshold priority with urgency ...

  • Flow Structure in a Shallow Mixing Layer Developing over 2-D Dunes 

    Authors:Kirkil, Gökhan
    Publisher and Date:(EDP Sciences, 2018)
    A high resolution Detached Eddy Simulation (DES) are used to characterize the evolution of a shallow mixing layer developing between two parallel streams in a long open channel over two-dimensional (2D) dunes. The study discusses the vertical non-uniformity in the mixing layer and provides a quantitative characterization of the growth of the large-scale quasi 2D coherent structures with the distance from the splitter plate. The presence of large-scale roughness elements in the form of an array of ...

  • Level Densities of Heavy Nuclei in the Shell Model Monte Carlo Approach 

    Nuclear level densities are necessary input to the Hauser-Feshbach theory of compound nuclear reactions. However the microscopic calculation of level densities in the presence of correlations is a challenging many-body problem. The configuration-interaction shell model provides a suitable framework for the inclusion of correlations and shell effects but the large dimensionality of the many-particle model space has limited its application in heavy nuclei. The shell model Monte Carlo method enables ...

  • Nuclear level density of 161Dy in the shell Model Monte Carlo Method 

    Authors:Özen, Cem; Alhassid, Yoram; Nakada, Hitoshi
    Publisher and Date:(EDP Sciences, 2012)
    We extend the shell-model Monte Carlo applications to the rare-earth region to include the odd-even nucleus Dy-161. The projection on an odd number of particles leads to a sign problem at low temperatures making it impractical to extract the ground-state energy in direct calculations. We use level counting data at low energies and neutron resonance data to extract the shell model ground-state energy to good precision. We then calculate the level density of Dy-161 and find it in very good agreement ...

  • Universality of elasticity on PAAM-NIPA copolymer gels 

    Authors:Evingür, Gülşen Akin; Pekcan, Önder
    Publisher and Date:(EDP Sciences, 2015)
    Polyacrylamide (PAAm)-N-isopropylacrylamide (NIPA) copolymers were prepared via free radical crosslinking copolymerization with different molar of NIPA varying in the range between 0 and 2 M. The mechanical properties of swollen PAAm-NIPA copolymers were characterized by the compressive testing technique. It is understood that the compressive elastic modulus was found to increase by increasing NIPA contents keeping temperature constant at 30 degrees C. The critical exponent of elasticity y above ...