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A first comparison of bone histomorphometry in extant domestic horses(Equus caballus)and a Pleistocene Indian wild horse(Equus namadicus)

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Integrative Zoology 2020年第6期15卷 448-460页

作者： Marco ZEDDA Vijay SATHE prateek chakraborty Maria Rita PALOMBO Vittorio FARINA Department of Veterinary Medicine University of SassariItaly Department of AIHC&Archaeology Deccan College Postgraduate and Research InstitutePuneIndia CNR-IGAG c/o Department of Earth SciencesSapienza UniversityRomaItaly

The microstructural features of the tissue of long bones subjected to different biomechanical stresses could be a helpful tool for a better understanding of locomotor behavior in extant and extinct mammals,including ***,few researches have attempted to describe the bone tissue of extinct *** our study,we analyze and compare the histomorphometric features of the bone tissue in extant modern horses,Equus caballus,and Equus namadicus,a Pleistocene Indian extinct wild *** number,position,and size of the osteons and Haversian canals of the bone tissue,classifiable as dense Haversian tissue,were considered for the *** results obtained highlight some differences between the analyzed species,*** having fewer and bigger osteons than *** microstructural differences may depend on the different lifestyles and environmental conditions characterizing the two *** results obtained suggest that comparing the biomechanical properties of extinct and modern horse species may provide indirect information on their paleoenvironment.

关键词： bone tissue Equus caballus Equus namadicus histomorphometry horse

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Time Dependent Gaussian Equivalent Linearization of Duffing Oscillator Using Continuous Wavelet Transform

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Journal of Civil Engineering and Architecture 2013年第8期7卷 1006-1017页

作者： Arunasis chakraborty prateek Mittal Sabarethinam Kameshwar Department of Civil Engineering Indian Institute of Technology Guwahati Guwahati 781039 India Department of Urban and Regional Planning University of Illinois at Urbana-Champaign Urbana IL 61801 USA Department of Civil Engineering Rice University Houston TX 77251 USA

Evolutionary response analysis of Duffing oscillator using Gaussian equivalent linearization in wavelet based time-frequency frame work is presented here. Cubic （i.e., odd type） non-linearity associated with stiffness and damping is modeled. The goal of this research is to develop the mathematical model of an equivalent linear system which is applicable for different non-stationary input processes （i.e., either summation of amplitude modulated stationary orthogonal processes or digitally simulated non-stationary processes）. The instantaneous parameters of the ELTVS （equivalent linear time varying system） are evaluated by minimizing the error between the displacements of non-linear and equivalent linear systems in wavelet domain. For this purpose, three different basis functions （i.e., Mexican Hat, Morlet and a modified form of Littlewood-Paley） are used. The unknown parameters （i.e., natural frequency and damping） of the ELTVS are optimized in stochastic least square sense. Numerical results are presented for different types of input to show the applicability and accuracy of the proposed wavelet based linearization technique.

关键词： Statistical linearization wavelet analysis Duffing oscillator evolutionary process.

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