LITHIUM ISOTOPIC CONSTRAINTS ON THE ORIGIN OF I- AND A-TYPE GRANITES FROM EAST JUNGGAR (NW CHINA) OF THE CENTRAL ASIAN OROGENIC BELT: IMPLICATIONS FOR LI ISOTOPIC FRACTIONATION DURING CRUSTAL ANATEXIS

Though Li isotope fractionation during mantle melting and differentiation of basaltic melts have been proved insignificant, Li isotopic systems during crustal processes remain unclear. To study this, we report combined petrological, Nd-Sr and Li isotopic data for the late Paleozoic coexisting I- and A-type granites in the East Junggar orogen of the Central Asian Orogenic Belt. The granites were formed responding to underplating of mafic magmas in the lower crust in a postcollisional, extensional regime, and intruded into the Paleozoic foldbelts that formed due to extensive oceanic subduction-accretion processes.Though Li isotope fractionation during mantle melting and differentiation of basaltic melts have been proved insignificant, Li isotopic systems during crustal processes remain unclear. To study this, we report combined petrological, Nd-Sr and Li isotopic data for the late Paleozoic coexisting I- and A-type granites in the East Junggar orogen of the Central Asian Orogenic Belt. The granites were formed responding to underplating of mafic magmas in the lower crust in a postcollisional, extensional regime, and intruded into the Paleozoic foldbelts that formed due to extensive oceanic subduction-accretion processes

THE EFFECT OF THE PLANTAR PLATE ON PLANTAR APONEUROSIS STRAIN: 3D FlNlTE ELEMENT MODELING OF FOOT AND ANKLE

Experimental measurements of stresses and strains for the Lower Extremity Injuries (LEI) are invasive, and therefore, predictions require physiologically accurate 3D Finite Element (FE) models of the foot and ankle. Previous FE models of foot and ankle in the literature neglect the function of the plantar plate, and therefore, these models underestimate the Plantar Aponeurosis (PA) strain. In this study the effect and function of the plantar plate on PA strain and other biomechanical parameters of foot and ankle are studied. The Soft Tissue (ST) and PA are analysed as hyperelastic materials supplemented by material sensitivity analysis. The plantar plate Is contributlng towards more accurate prediction of PA strain (1-1.4% at full body weight during balanced standing). Material properties of ST also highly affect the PA strain, and it is a primary feature in validating FE models

Rear-Surface Collapse of Finite Thickness Concrete Targets under Internal Explosion

An experimental investigation on the buried internal explosion in finite thickness concrete targets was carried out, with the aim at developing an available criterion for the critical collapse of rear-surface to determine the critical collapse thickness and the critical amount of explosive charge under different depth of buried. It is found, under a certain density and diameter of explosive charge, the critical collapse thickness increases monotonically with the length-to-diameter ratio or the amount of the explosive charge, but the increasing becomes slower down after the length-to-diameter ratio of the explosive charge is larger than about 5, which implies that the geometry of the explosive charge can have much influence on the damage and failure of concrete targets due to different mechanism of energy dissipation. Moreover, by using the dimensional analysis approach, the function relation between the dimensionless critical collapse thickness and the length-to-diameter ratio was obtained, which shows that the dimensionless critical collapse thickness depends on both the amount and the length-to-diameter ratio of the charge.Defence Science Journal, 2012, 62(5), pp.295-299, DOI:http://dx.doi.org/10.14429/dsj.62.123