A study has been initiated to investigate interactions between low-energy xenon ions and molybdenum using molecular dynamics (MD) simulation. An MD code, Simulation Kit, designed for simulation of atomic collisions in solid lattices was used in this study. The ion energies ranged from 150 to 500 eV. The ions impinged on the target normal to the (110) plane. The target consisted of 6 layers, eac...

The environment dependent interatomic potential (EDIP) including ZieglereBiersackeLittermark (ZBL) interactions for close encounters is applied to cascades starting from a host atom and from an interstitial atom. We find the room temperature displacement threshold to be 25 eV, increasing to 30 eV at 900 K. The latter correlates well with the measured threshold for vacancy production. Additional...

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In studying the complexity of iterative processes it is usually assumed that the arithmetic operations of addition, multiplication, and division can be performed in certain constant times. This assumption is invalid if the precision required increases as the computation proceeds. We give upper and lower bounds on the number of single-precision operations required to perform various multiple-pre...

Silicon sputter yield under medium energy Ar+ ion bombardment is calculated via molecular dynamics, using a highly accurate interatomic potential for Ar–Si interactions derived from first-principles calculations. Unlike the widely used universal repulsive potentials such as the Moliere or ZBL parameterizations, this new potential, referred to as DFT-ArSi, is developed via localized basis densit...

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two iranian strains of brachionus rotifers were cultured under different food and salinity regimes. the rotiferswere fed with five algal types (freshwater and marine chlorella vulgaris, nannochloropsis occulata, isochrysisgalbana and scenedesmus obliquus) at three different salinities (5, 15 and 25 g/l) and their reproductive and growth parameters were assessed. the maximum number of ovigerous ...