ARDC Research Link Australia

ORCID Profile
Orcid icon. 0000-0003-2990-5084

Current Organisations
Fuzhou University , Ulster University - Jordanstown Campus , Nazarbayev University

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Publications

Publication

Mechanical properties of lithic raw materials from Kazakhstan: Comparing chert, shale, and porphyry

Publisher: Public Library of Science (PLoS)

Date: 22-04-2022

DOI: 10.1371/JOURNAL.PONE.0265640

Abstract: The study of lithic raw material quality has become one of the major interpretive tools to investigate the raw material selection behaviour and its influence to the knapping technology. In order to make objective assessments of raw material quality, we need to measure their mechanical properties (e.g., fracture resistance, hardness, modulus of elasticity). However, such comprehensive investigations are lacking for the Palaeolithic of Kazakhstan. In this work, we investigate geological and archaeological lithic raw material s les of chert, porphyry, and shale collected from the Inner Asian Mountain Corridor (henceforth IAMC). Selected s les of aforementioned rocks were tested by means of Vickers and Knoop indentation methods to determine the main aspect of their mechanical properties: their indentation fracture resistance (a value closely related to fracture toughness). These tests were complemented by traditional petrographic studies to characterise the mineralogical composition and evaluate the level of impurities that could have potentially affected the mechanical properties. The results show that materials, such as porphyry possess fracture toughness values that can be compared to those of chert. Previously, porphyry was thought to be of lower quality due to the anisotropic composition and coarse feldspar and quartz phenocrysts embedded in a silica rich matrix. However, our analysis suggests that different raw materials are not different in terms of indentation fracture resistance. This work also offers first insight into the quality of archaeological porphyry that was utilised as a primary raw material at various Upper Palaeolithic sites in the Inner Asian Mountain Corridor from 47–21 ka cal BP.

Publication

iGAIT: An interactive accelerometer based gait analysis system

Publisher: Elsevier BV

Date: 11-2012

DOI: 10.1016/J.CMPB.2012.04.004

Abstract: This paper presents a software program (iGAIT) developed in MATLAB, for the analysis of gait patterns extracted from accelerometer recordings. iGAIT provides a user-friendly graphical interface to display and analyse gait acceleration data recorded by an accelerometer attached to the lower back of subjects. The core function of iGAIT is gait feature extraction, which can be used to derive 31 features from acceleration data, including 6 spatio-temporal features, 7 regularity and symmetry features, and 18 spectral features. Features extracted are summarised and displayed on screen, as well as an option to be stored in text files for further review or analysis if required. Another unique feature of iGAIT is that it provides interactive functionality allowing users to manually adjust the analysis process according to their requirements. The system has been tested under Window XP, Vista and Window 7 using three different types of accelerometer data. It is designed for analysis of accelerometer data recorded with s le frequencies ranging from 5 Hz to 200 Hz.

Publication