This paper describes a sliding friction model for an electro-deposited coating. Reciprocating sliding tests using ball-on-flat plate test apparatus are performed to determine an evolution of the kinetic friction coefficient. The evolution of the friction coefficient is classified into the initial running-in period, steady-state sliding, and transition to higher friction. The friction coefficien...

In this research, the efficiency of the comminution circuit as well as the efficiency of size classification equipment of the concentrator plant 2 of Sarcheshmeh copper complex was studied. The comminution circuit of this plant includes one SAG mill in a closed circuit with a vibrating screen and one ball mill with a size classification system of hydrocyclone. The goal of this work was to calcu...

We study two fundamental problems in computational geometry: finding the maximum inscribed ball (MaxIB) inside a bounded polyhedron defined bym hyperplanes in a d-dimensional space, and finding the minimum enclosing ball (MinEB) of a set of n points in a d-dimensional space. We translate both these geometric problems into optimization problems and apply firstorder methods for smooth and saddle-...

objectives: the incidence of stereotyped behaviors is one of the major symptoms of diagnosis of individuals with autism spectrum disorder that causes disruption in daily life. this study aimed at evaluating the effectiveness of ball exercises on the reduction of stereotypical behavior of children with autism spectrum disorder. methods: in this study, 16 children (boys) with autism spectrum diso...

We studied the following two geometric optimization problems with cardinality constraints. • Capacitated covering with unit balls: Given a set of n points in R and a positive integer L, partition them into a minimum number of groups such that each group contains at most L points, and can be covered by a unit ball in R. • Capacitated connected dominating set in unit disk graph: Given a positive ...

Abstract: The specific rate of breakage is one of the most important factors in evaluation of grinding process especially in ball mill. In this article the effect of ball size and feed size on selection function were investigated using batch grinding circuit on two-iron ore anomaly (B, C) from sangan mine in north of Iran. Eight different monosize fractions were prepared between 2000 and 50...

The inflaton condensate associated with a global symmetry can fragment into quasistable Q balls, provided the inflaton oscillations give rise to an effective equation of state with negative pressure. We study chaotic inflation with a running inflaton mass and show that, depending on the sign of the radiative mass correction, the process of fragmentation into inflatonic Q balls can actually take...

Ball game players frequently perform changes of direction (CODs) while running; however, there has been little research on the physiological impact of CODs. In particular, the effect of running velocity on the physiological and energy demands of CODs while running has not been clearly determined. The purpose of this study was to examine the relationship between running velocity and the energy c...

This paper presents the creation of the Pong game running on an FPGA with a computer display connected to it. The game is optimized to work on both LCD and CRT displays too. The game is implemented from scratch, it has the two pads (one read and one blue) drawn on the screen, the green ball is also drawn and the background is painted in white. Everything is implemented in hardware on an FPGA, s...