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Mechanical properties and in vivo biodegradability of Mg-Zr-Y-Nd-La magnesium alloy produced by a combined severe plastic deformation

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Rare Metals 2021年第3期40卷 651-662页

作者： a.torkian G.Faraji M.S.Pedram School of Mechanical Engineering College of EngineeringUniversity of TehranTehran 11155-4563Iran Department of Veterinary Surgery and Radiology Faculty of Veterinary MedicineUniversity of Tehran14199-63111Iran

Permanent implants are going to be replaced by the implementation of biodegradable magnesium-based implants in fixation of internal bone fractures because of many concerns associated with conventional ***,biodegradable magnesium-based biomaterials exhibit higher biodegradation rate and low mechanical properties which are the main *** work aims to almost overcome both disadvantageous by grain refining of a WE43 magnesium alloy containing 93.04 wt% Mg,4.12 wt% Y,2.15 wt% Nd,0.43 wt% Zr,and 0.26 wt%*** this study,the consequences of combined severe plastic deformation(SPD) on the mechanical properties,microstructure,and in vivo degradation behavior of WE43 magnesium alloy were *** do so,WE43 magnesium alloy was chosen and processed through multipass equal channel angular pressing(ECAP) at 330℃ for up to four passes followed by an extrusion *** results showed that higher strength and hardness with minimum ductility less was obtained in the sample processed via two-pass ECAP followed by *** vivo biodegradation experiments showed higher degradation rate for the unprocessed coarse-grained(CG) WE43 *** two-pass ECAP and extruded sample with ultrafine-grained(UFG) structure exhibited the lowest in vivo biodegradation rate besides appropriate mechanical *** may be concluded that the WE43 magnesium alloy processed via two-pass ECAP and extrusion could be a very promising candidate for biodegradable implants from both mechanical and biocorrosion viewpoints.

关键词： Implant Severe plastic deformation WE43 Grain refinement Hardness Mechanical properties

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微波辅助燃烧法制备镁铝尖晶石纳米粉体的研究(英文)

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无机材料学报 2011年第5期26卷 550-554页

作者： Leila.torkian Mostafa M Amini Zohreh Bahrami Department of Applied Chemistry Islamic Azad University Department of Chemistry Shahid Beheshti University School of Chemistry Collage of ScienceUniversity of Tehran

Stoichiometric MgAl2O4 spinel nanoparticles were synthesized by microwave assisted combustion reaction from aluminium nitrate nanohydrate(Al(NO3)3.9H2O) and Sol-Gel prepared magnesium hydroxide(Mg(OH)2) in the presence of urea((NH2)2CO) as a fuel,in about 20 min of irradiation.X-ray diffraction(XRD) studies reveal that mi-crowave assisted combustion synthesis route yields single-phase spinel nanoparticles with larger crystalline size(around 75 nm) than other conventional heating *** electronic microscope(SEM) images show nanoparticles with spherical shape and homogenous *** surface area measurements(SBET) show crystals with 2.11 m2/g and 0.0033 mL/g pore volume.

关键词：微波辅助燃烧法制备镁铝尖晶石纳米粉体研究纳米材料

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The relationship between abduction deficit and reoperation among patients with infantile esotropia

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International Journal of Ophthalmology(English edition) 2018年第3期11卷 478-483页

作者： Zhale Rajavi Hamideh Sabbaghi Pooya.torkian Narges Behradfar Mehdi Yaseri Mohadeseh Feizi Mohammad Faghihi Kourosh Sheibani Ophthalmic Epidemiology Research Center Shahid Beheshti University of Medical Sciences Department of Ophthalmology School of Medicine Shahid Beheshti University of Medical Sciences Ophthalmic Research Center Shahid Beheshti University of Medical Sciences Department of Optometry School of Rehabilitation Shahid Beheshti University of Medical Sciences School of Medicine Shahid Beheshti University of Medical Sciences Department of Epidemiology and Biostatistics Tehran University of Medical Sciences Torfeh Eye Hospital Shahid Beheshti University of Medical Sciences Basir Eye Health Research Center Basir Eye Clinic

AIM： To determine the relationship between abduction deficit and reoperation among patients with infantile esotropia （IET）. METHODS： The records of 216 patients （432 eyes） with lET who underwent surgery, from 2010 to 2015 were studied. Patients with lET whose deviation appeared before 6mo of age and had stable preoperative deviation in two examinations with at least 2wk apart and a minimum 3too postoperative follow up were included. Cases with early onset accommodative esotropia, congenital cataract, retinopathy of prematurity （ROP）, manifest nystagmus, fundus lesions, neurologic and ophthalmic anomalies, 6th nerve palsy and Duane＇s syndrome were excluded. Preoperative abduction deficit was considered from -1 to -3 grading scale. Three months after surgery, children were classified into no-need reoperation [deviation〈15 prism diopters （PD）], and need-reoperation groups （deviaUon〉15 PD）. RESULTS： In this retrospective study, 117 female and 99 male patients with the mean surgical age of 4.7±6.4y were included. Reoperation rate was 33.3% and 16.0% in lET patients with and without abduction deficit, respectively in patients who had a history of late surgery. Abduction deficit increased the odds of reoperation by 82% [OR=1.82, 95% confidence interval （CI） =1.05 to 3.19, P=0.003] in patients who had a history of late surgery （〉2 years old, P=0.021）. Abduction deficit was improved significantly after operation （P〈0.001）. CONCLUSION： Based on our results, abduction deficit can be considered as a risk factor of reoperation in lET patients who are operated at the age of more than 2y.

关键词： infantile esotropia abduction deficit reoperation rate

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Petrography and Tectonic Setting of Dykes in the Granitoid Intrusive, South to East-Qorveh(Kurdistan Province), Iran

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Acta Geologica Sinica(English Edition) 2016年第S1期90卷 93-页

作者： Ashraf torkian Department of Geology Faculty of Science Bu–Ali Sina University

The studied area is located in the south to east of the Qorveh city(Kurdistan Province)in the Sanandaj-Sirjan *** on field observations,the dykes are mafic to dioritic in composition,and followed by granitic dykes

关键词： Petrography and Tectonic Setting of Dykes in the Granitoid Intrusive Kurdistan Province South to East-Qorveh Iran

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