More than half of fatalities to seat-belt-wearing drivers in frontal crashes occur at impact speeds below 55km/h. Pedestrians and other vulnerable road users are at risk at much lower speeds. The impact speed depends on the timing and degree of braking, if any, that occurs before the crash. The resulting impact speed is highly dependent on the initial travel speed. Small increases in travel spe...

in this paper, dynamic analysis of the composite truncated sandwich conical shells (stcs) with various boundary conditions subjected to low velocity impact was studied analytically, based on higher order sandwich panel theory. impact was assumed to occur normally over to the top face-sheet and the contact force history is predicted using two solution models of the motion are derived based on ha...

the direction and speed of winds play an important role in the occurrence of pollutions and dust stormas well as location placement for the establishment of industries and the expansion of cities. yazd is a dry area of iran, and constantly exposed to the dust particles in the air; and this in terms of human life and health issues are of special importance. in this paper a day when due to the am...

Escape analysis can improve the speed and memory efficiency of garbage collected languages by allocating objects to the call stack, but an offline analysis will potentially interfere with dynamic class loading and an online analysis must sacrifice precision for speed. We describe a technique that permits the safe use of aggressive, speculative offline escape analysis in programs potentially loa...

Classical dynamic fracture theories predict the surface wave speed to be the limiting speed for propagation of in-plane cracks in homogeneous, linear elastic materials subjected to remote loading. This report presents experimental evidence to the contrary. Intersonic shear-dominated crack growth featuring shear shock waves was observed along weak planes in a brittle polyester resin under far-fi...

In order to study the influence of sudden change loading rate on crack propagation and failure mode rock bridge fractured mass, specimens used in this paper were rock-like materials containing two prefabricated fractures. The mechanical properties under different constant rates changes tested. photographic monitoring acoustic emission carried out at same time. results show that: (1) process loa...

Disagreements exist regarding the manner in which weight should be dynamically shared both withinand between-feet to generate maximal golf clubhead speed. The purpose of this study was test the null hypothesis that maximum plantar pressure (PP) distributions do not correlate with clubhead speed. Thirty-two amateur golfers (handicaps: 2.7-25) performed 10 swings with a driver. Clubhead speed was...