A simple model for fast correction of the horizontal position of atokamak plasma

A virtual movement of the plasma in the radial direction was studied in order to obtain the magnitude of the vertical field applied to the Tokamak de Varennes plasma for fast horizontal motion using coils inside the vacuum vessel. The developed model includes the radial dependence of several parameters     

Parallel Supercomputing PC Cluster and Some Physical Results in Lattice QCD

We describe the construction of a high performance parallel computer composed of PC components, presentsome physical results for light hadron and hybrid meson masses from lattice QCD. We also show that the smearingtechnique is very useful for improving the spectrum calculations.     

Laminar-flow bolus shapes in flow injection analysis

Bolus shapes for injected samples have been calculated for times of interest in experiments on flow injection analysis. The effect of both system and molecular parameters on the shapes and the dispersion of samples is considered. The implications for merging-zone experiments are discussed briefly.     

cis‐Dicarbonyl‐cis‐dichlorido‐trans‐bis(triphenylphosphine‐κP)iridium(III) tetrafluoridoborate,formed by reaction of (cycloocta‐1,5‐diene)bis(triphenylphosphine)iridium tetrafluoridoborate with carbonyl fluoride in dichloromethane solution

The reaction between carbonyl fluoride and [Ir(COD)(PPh₃)₂]BF₄ (COD is cycloocta‐1,5‐diene) in dichloromethane solution affords the novel title iridium salt, [IrCl₂(C₁₈H₁₅P)₂(CO)₂]BF₄. The cation lies across a twofold rotation axis in the space group P2₁2₁2 and its structure confirms the presence in a cis relationship of two metal‐bound chlorides, while the phosphine ligands occupy a trans pair of sites. The anion also lies across a twofold rotation axis, and the F atoms are disordered over two sets of sites.     

Robustness of pulsating jet-like layers in sheared nano-rod dispersions

Nano-rod dispersions in steady shear exhibit persistent transient responses both in experiments and simulations. The rotational contribution from shear flow couples with orientational diffusion, excluded-volume interactions, and distortional elasticity to yield complex dynamics and gradient morphology of the rod ensemble. The classification of sheared responses has mostly focused on “nematodynamics” of the collective particle response known as tumbling, wagging and kayaking; in heterogeneous simulations, one monitors the variability in nematodynamics across the domain. In this paper, we focus on flow coupling and non-Newtonian feedback in transient heterogeneous simulations, and in particular on a remarkable effect: the formation of localized, pulsating jet layers in the shear gap. We solve the Navier–Stokes momentum equations coupled through an orientation-dependent stress to three different orientational models (a kinetic Smoluchowski equation and two tensor models, one from kinetic closure and another from irreversible thermodynamics). A similar spurt phenomenon was reported in 1D simulations of a model for planar nematic liquids by Kupferman et al. [R. Kupferman, M. Kawaguchi, M.M. Denn, Emergence of structure in models of liquid crystalline polymers with elasticity, J. Non-Newt. Fluid Mech. 91 (2000) 255–271], which we extend to full orientational configuration space. We show: the pulsating jet layers correlate, in space and time, with the formation of a non-topological “oblate defect phase” in which the principal axis of orientation spreads from a unique direction to a circle; the jet-defect layers form where the local nematodynamics transitions from finite oscillation (wagging) to continuous rotation (tumbling), and when neighboring directors lose phase coherence; and, a negative first normal stress difference develops in the pulsating jet-defect layers. Finally, we extend one model algorithm to two space dimensions and show numerical stability of the jet-defect phenomenon to 2D perturbations.