The reaction process A + B → ∅ is modelled for ballistic reactants on an infinite line with particle velocities vA = c and vB = −c and initially segregated conditions, i.e. all A particles to the left and all B particles to the right of the origin. Previous models of ballistic annihilation have particles that always react on contact, i.e. pair-reaction probability p = 1. The evolution of such s...

The fine structure of the superficial layers of the tablet-forming micro-organism, Lampro­ pedia hyalina, has been studied by several electron microscopical techniques. The outer envelope is distinct from the cell wall and surrounds not individual cells but groups of cells (tablets). This envelope appears to embody two complex layers, both possessing a regularpatterned structure. One layer (the...

Most cell of the dorsal laterial geniculate nucleus of rats are generated on fetal days 12 to 14. Their axons invade the telencephalon on fetal day 16 and run in the intermediate zone just below the cortical plate, reaching the visual area of fetal day 18. The axons do not invade the cortical plate significantly until close to birth (day 22 of gestation) and reach their zone of terminal distri...

The morphology of injection moulded samples of polyamide-polybutadiene blends (85.15) with an average particle size of 0.3 pm was studied. The samples were fractured in a notched tensile test at crosshead speeds of 10m4 and 1 rns-’ and the structure of the deformation zone was studied using various techniques: polarized light microscopy, scanning electron microscopy, transmission electron micro...

We investigate fluid motions near the midplane of vertically stratified accretion disks with highly resistive midplanes. In such disks, the magnetorotational instability drives turbulence in thin layers surrounding a resistive, stable dead zone. The turbulent layers in turn drive motions in the dead zone. We examine the properties of these motions using three-dimensional, stratified, local, she...

Magneto-convection simulations on meso-granule and granule scales near the solar surface are used to study small scale dynamo activity, the emergence and disappearance of magnetic flux tubes, and the formation and evolution of micropores. From weak seed fields, convective motions produce highly intermittent magnetic fields in the intergranular lanes which collect over the boundaries of the unde...

The fine structure of the superficial layers of the tablet-forming micro-organism, Lampro­ pedia hyalina, has been studied by several electron microscopical techniques. The outer envelope is distinct from the cell wall and surrounds not individual cells but groups of cells (tablets). This envelope appears to embody two complex layers, both possessing a regularpatterned structure. One layer (the...

In this research, St37 and 316L steel sheets were welded using friction stir welding (FSW) process and effective parameters such as the rotational speed, linear speed of the tool, pin diameter, and their appropriate values were studied. The microstructure, hardness, and strength of the different welding regions were investigated. It was observed that in the stir zone (SZ), a mechanical operatio...

ni-p and ni layers multilayer coatings were applied to az31 magnesium alloy utilizing electroless and electrodeposition procedures. the aim of the project was to decrease cracks and increase corrosion resistance of the coatings. in order to compare the coatings, the effect of single layer electroless ni-p coatings with different thicknesses was also investigated. the microstructure and phase co...

A tugh resolution (2/am) acousUc step-wave probing techmques has been developed to investigate the lnhomogeneous dtstnbutlon of the piezoelectric response of incompletely corona poled 85/am ttuck PVDF films We observe persistent polanzaUon zones or layers of 20-40/am width within the films wtuch are electrostatlcally compensated by charge accumulaUon at the polanzaUon zone boundaries The zone d...