Digital Image Analysis (DIA) has been employed to characterize the time evolution of a bubble injected from a single orifice into a pseudo 2-dimansional gas-solid fluidized bed. The injected bubble diameter increased with the square root of time before detachment. During bubble free flight in the bed, its diameter remains approximately constant. The center of mass of the bubble increases with t...

introduction: the selection of suitable beam angles and weights in external-beam radiotherapy is at present generally based upon the experience of the planner. therefore, automated selection of beam angles and weights in forward-planned radiotherapy will be beneficial. material and methods: in this work, an efficient method is presented within the matlab environment to investigate how to improv...

Changes in landscape structure can greatly affect biological evolution, but the role of such changes in generating macroscopic patterns is still poorly understood [1]. Recent studies suggest that principal processes in species evolution in landscapes are an instance of a mechanism observed in a wide range of complex systems, which we have termed Dual Phase Evolution (DPE) ([2], [3], [6]). Here,...

the pre.sent rep.or,t describes the morphological and if nod h pron erative aspects of lymph es iii odgkin s disease grown in tissue culture. the development of hodgkin's lymph-nodes grown in vitro seems to depend upon the  a~e of t~e person and the stage of the hodgkin's disease at the time the i h is obtained. ymp - the morphological and the proliferative aspects ('helralcterizi~d of hodgkin'...

We analyse the evolution of scalar and gauge fields during a second order phase transition using a Langevin equation approach. We show that topological defects formed during the phase transition are stable to thermal fluctuations. Our method allows the field evolution to be followed throughout the phase transition, for both expanding and non-expanding Universes. The results verify the Kibble me...

Knowledge of the behavior of stochastic optical fields can aid the understanding of the scintillation of light propagating through a turbulent medium. For this purpose, we perform a numerical investigation of the evolution of the scintillation index and the optical vortex density in a speckle field after removing its continuous phase. We find that both the scintillation index and the vortex den...

We present a modeling approach that enables numerical simulations of a boiling Van der Waals fluid based on the diffuse interface description. A boundary condition is implemented that allows in and out flux of mass at constant external pressure. In addition, a boundary condition for controlled wetting properties of the boiling surface is also proposed. We present isothermal verification cases f...