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Effect of Y_2O_3 stabilized ZrO_2 coating with tri-model structure on bi-layered thermally grown oxide evolution in nano thermal barrier coating systems at elevated temperatures

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Journal of Rare Earths 2014年第1期32卷 57-77页

作者： Mohammadreza Daroonparvar Muhamad Azizi Mat Yajid Noordin Mohd Yusof Hamid Reza Bakhsheshi-rad Z.Valefi Esah Hamzah Department of Materials Manufacturing and Industrial Engineering Faculty of Mechanical Engineering Universiti Teknologi Malaysia School of Metallurgy and Materials College of Engineering University of Tehran

Bi-layered thermally grown oxide （TGO） layer plays a major role in the spallation of Y2O3 stabilized ZrO2 （YSZ） layer form the bond coat in the thermal barrier coating （TBC） systems during oxidation. On the other hand, bi-layered TGO formation and growth in the TBC systems with nanostructured YSZ have not been deeply investigated during cyclic oxidation. Hence, Inconel 738/NiCrAlY/normal YSZ and Inconel 738/NiCrAlY/nano YSZ systems were pre-oxidized at 1000 °C and then subjected to cyclic oxidation at 1150 °C. According to microstructural observations, nanostructured YSZ layer over the bond coat should have less mi-cro-cracks and pinholes, due to the compactness of the nanostructure and the presence of nano zones that resulted in lower O infiltration into the nanothermal barrier coating system, formation of thinner and nearly continuous mono-layered thermally grown oxide on the bond coat during pre-oxidation, lower spinels formation at the Al2O3/YSZ interface and finally, reduction of bi-layered thermally grown oxide thickness during cyclic oxidation. It was found that pre-heat treatment and particularly coating microstructure could influence microstructural evolution （bi-layered TGO thickness） and durability of thermal barrier coating systems during cyclic oxidation.

关键词： spinels oxidation three stages TGO growth pre-heat treatment rare earths

DFT and TD-DFT Calculations of Orbital Energies and Photovoltaic Properties of Small Molecule Donor and Acceptor Materials Used in Organic Solar Cells

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Journal of Renewable Materials 2022年第10期10卷 2553-2567页

作者： Daniel Dodzi Yao Setsoafia Kiran Sreedhar Ram Hooman Mehdizadeh-rad David Ompong Vinuthaa Murthy Jai Singh College of Engineering IT and EnvironmentPurple 12Charles Darwin UniversityDarwinNT 0909Australia Energy and Resources Institute Charles Darwin UniversityDarwinNT 0909Australia

DFT and TD-DFT calculations of HOMO and LUMO energies and photovoltaic properties are carried out on four selected pentathiophene donor and one IDIC-4F acceptor molecules using B3LYP and PBE0 functionals for the ground state energy calculations and CAM-B3LYP functional for the excited state *** discrepancy between the calculated and experimental energies is reduced by correlating them with a linear *** fitted energies of HOMO and LUMO are used to calculate the Voc of an OSC based on these donors and acceptor blend and compared with experimental *** the Scharber model the calculated PCE of the donor-acceptor molecules agree with the *** has been found that fluorine substitution can be used to improve charge transport by reducing the electron and hole reorganization energies of the *** is also found that the introduction of fluorine onto the donor pentathiophene unit of the donor molecule results in a change of polarity of the distributed charges in the molecule due to the high electronegativity of the fluorine *** quantum chemical potential(μ),chemical hardness(η)and electronegativity(χ),and electrostatic potential maps(EPMs)are also calculated to identify different charge distribution regions in all five molecules.

关键词： Acceptor donor DFT excitons HOMO LUMO small molecule electrophilic nucleophilic and reorganization energy

Cobalt（Ⅲ） Complex [CoL3] Derived from an Asymmetric Bidentate Schiff Base Ligand L （L=（5-Bromo-2- hydroxybenzyl-2-furylmethyl）-imine）： Synthesis, Characterization and Crystal Structure

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Chinese Journal of Chemistry 2011年第8期29卷 1613-1616页

作者： Khalaji, Aliakbar D. Maghsodlou rad, Sepideh Grivani, Gholamhossein Rezaei, Morteza Gotoh, Kazuma Ishida, Hiroyuki Department of Chemistry Faculty of Science Golestan University Gorgan Iran School of Chemistry Damghan University Damghan P. O. Box 36715-364 Iran Department of Chemistry Faculty of Science Okayama University Okayama 700-8530 Japan

Cobalt（Ⅲ） complex [CoL3], where L=（5-bromo-2-hydroxybenzyl-2-furylmethyl）imine, has been synthesized by reacting cobalt（Ⅱ） nitrate with L. The complex has been characterized by elemental analysis and FT-IR spectroscopy. The crystal structure of [CoL3]_was determined by X-ray crystallography from single crystal data. It crys- tallizes in the triclinic space group P1 with unit cell parameters： a=9.6644（10）A, b--11.5657（11）A, c= 16.5809（17）A, a= 102.833（4）°,β= 102.999（3）°, γ= 105.480（3）°, V= 1659.9（3）A3 and Z=2. Thermal decomposition of [COL3] was studied by thermogravimetry in order to evaluate its thermal stability and thermal decomposition pathways.

关键词： Cobat(Ⅲ) spectroscopy crystal structure thermogravimetry

Occurrence of trichoepithelioma in a cat:Histopathologic and immunohistochemical study

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Asian Pacific Journal of Tropical Biomedicine 2013年第5期3卷 413-415页

作者： Abbas Tavasoli Hannaneh Golshahi Maryam Nobakht rad Afra Taymouri Department of Pathology Faculty of Veterinary MedicineUniversity of Tehran Division of General Surgery Department of SurgeryFirouzgar Hospital Faculty of Veterinary Medicine University of Tehran

Trichoepitheliomas are benign follicular appendage tumors with differentiation to all three segments of the hair follicle.A 2 years old female domestic short hair cat presented with a mass on the *** mass was surgically excised and for histopathologic and immunohistochemical studies,was sent to Department of ***,the tumor was encapsulated and consisted of many islands of follicular epithelium and also cysts structures which varied in size and *** cells of epithelium islands were round to oval and had variable amounts of slightly,eosinophilic cytoplasm and euchromatic *** cystic structures were lined by a complex layer of squamous ***,cells under went an abrupt transition between basal layers and keratinization without the development of a granular cell *** tendency of malignancy was seen in this *** to mentioned characteristics,trichoepitlielioma was *** immunohistochemical study it was confirmed that this tumor had epithelial origin because squamous tumor cells reacted with the pan-cytokeratin *** expression of p-catenin was predominately cytoplasmic and also together with numerous positive nuclei but membranous expression was *** of neoplastic cells with P-catenin expression was more than 75%and labeling intensity was strong in both cytoplasm and *** to author's knowledge,this is the first report of trichoepithelioma in cat in Iran and also investigation of P-catenin expression in feline trichoepithelioma in veterinary literature.

关键词： Trichoepithelioma Catβ-catenin Pan-cytokeratin

MgO-attached graphene nanosheet(MgO@GNS)reinforced magnesium matrix nanocomposite with superior mechanical,corrosion and biological performance

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International Journal of Minerals,Metallurgy and Materials 2024年第9期31卷 2062-2076页

作者： S.Abazari A.Shamsipur H.R.Bakhsheshi-rad M.S.Soheilirad F.Khorashadizade S.S.Mirhosseini Department of Materials and Metallurgical Engineering Amirkabir University of TechnologyTehran ***Iran Iranian National Standards Organization of Hormozgan HormozganIran Advanced Materials Research Center Department of Materials EngineeringNajafabad BranchIslamic Azad UniversityNajafabadIran Department of Materials and Metallurgical Engineering Iran University of Science and TechnologyTehranIran

Magnesium(Mg)alloys are gaining great consideration as body implant materials due to their high biodegradability and ***,they suffer from low corrosion resistance and antibacterial *** this research,semi-powder metallurgy followed by hot extrusion was utilized to produce the magnesium oxide@graphene nanosheets/magnesium(MgO@GNS/Mg)composite to improve mechanical,corrosion and cytocompatibility *** have revealed that the incorporation of MgO@GNS nanohybrids into Mg-based composite enhanced microhardness and compressive *** vitro,osteoblast cell culture tests show that using MgO@GNS nanohybrid fillers enhances osteoblast adhesion and apatite *** presence of MgO@GNS nanoparticles in the composites decreased the opening defects,micro-cracks and micro-pores of the composites thus preventing the penetration of the corrosive solution into the *** demonstrated that the MgO@GNS/Mg composite possesses excellent antibacterial properties because of the combination of the release of MgO and physical damage to bacterium membranes caused by the sharp edges of graphene nanosheets that can effectively damage the cell wall thereby facilitating penetration into the bacterial lipid ***,the MgO@GNS/Mg composite with high mechanical strength,antibacterial activity and corrosion resistance is considered to be a promising material for load-bearing implant applications.

关键词： metal matrix composites MgO@GNS nanohybrid strengthening mechanisms antibacterial activity biocompatibility

Effect of Multi-Step Tempering on Retained Austenite and Mechanical Properties of Low Alloy Steel

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Journal of Iron and Steel Research International 2011年第12期18卷 49-56页

作者： Hamid Reza Bakhsheshi-rad Ahmad Monshi Hossain Monajatizadeh Mohd Hasbullah Idris Mohammed Rafiq Abdul Kadir Hassan Jafari Materials Engineering Department Islamic Azad University Materials Engineering Department Faculty of Mechanical EngineeringUniversity Technology Malaysia Materials Engineering Department Faculty of Mechanical EngineeringShahid Rajaee Teacher Training University

The effect of multi-step tempering on retained austenite content and mechanical properties of low alloy steel used in the forged cold back-up roll was *** evolutions were characterized by optical microscope,X-ray diffraction,scanning electron microscope and Feritscope,while the mechanical properties were determined by hardness and tensile *** results revealed that the content of retained austenite decreased by about 2% after multi-step ***,the content of retained austenite increased from 3.6% to 5.1% by increasing multi-step tempering *** hardness and tensile strength increased as the austenitization temperature changed from 800 to 920 ℃,while above 920 ℃,hardness and tensile strength *** addition,the maximum values of hardness,ultimate and yield strength were obtained via triple tempering at 520 ℃,while beyond 520 ℃,the hardness,ultimate and yield strength decreased sharply.

关键词： cold back-up roll retained austenite mechanical property austenite grain size

Evaluation of preventable trauma death in emergency department of Imam Reza hospital

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World Journal of Emergency Medicine 2016年第2期7卷 135-137页

作者： Changiz Gholipour Bahram Samadi rad Samad Shams Vahdati Amir Ghaffarzad Armita Masoud Road Traffic Injury Research Center Tabriz University of Medical Science Tabriz Iran Legal Medicine Research Center Legal Medicine Organization. Tehran Iran Emergency Department Tabriz University of Medical Science Tabriz Iran

BACKGROUND: Trauma is considered as a worldwide problem despite socio-economic development. Motor vehicle accidents(MVAs) are the most important cause of trauma. Trauma related deaths are mostly preventable. This study aimed to investigate the causes and prevention of death in trauma ***: This retrospective, descriptive-analytic study assessed 100 trauma patients referred to our emergency department(ED) from January 2013 to Januanry 2015. The included patients were those with trauma died after arrival at our ED. Age, sex, cause of trauma, clinical causes of death, causes of death def ined by autopsy, way of transfer to the ED, time of ambulance arrival at the scene of trauma, and time elapsed to enter the ED from the scene of trauma were ***: In the 100 patients, 21(21%) patients were female and 79(79%) male. Fortythree patients were older than 60 years. Trauma was largely due to pedestrian accidents in 31% of the patients, and 33% had a hypo-volemic shock. About 80% of deaths were due to intra-cranial hemorrhage(ICH) or intra-ventricular hemorrhage(IVH), and spinal injuries were not preventable. Autopsy revealed that 28% of the patients suffered from internal injuries. Autopsy revealed that 19% of the deaths were not preventable and 81% were considered preventable. In our patients, 76 were transferred to the hospital by emergency medicine services(EMS). Analysis of time for ambulance arrival to the scene and frequency of death revealed that 52.2% of the deaths occurred between 11 and 15 minutes. Analysis of time for admission to the ED from the scene of trauma showed that 74.6% deaths occurred between 6 and 10 ***: The rate of hospital preventable deaths is about 80%, a high mortality rate, which denotes a lack of proper diagnosis and treatment. The time for arrival of EMS at the scene of trauma is longer than that in other countries.

关键词： Trauma Preventable death

磺酸基修饰的纳米Fe_3O_4包覆二氧化硅颗粒作为可磁分离催化剂高效催化芳香醛与1,3-环二酮的Knoevenagel缩合反应和Michael加成反应(英文)

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催化学报 2012年第11期33卷 1825-1831页

作者： Firouzeh NEMATI Majid M.HERAVI Raheleh SAEEDI rad Department of Chemistry Semnan UniversitySemnanIran Department of Chemistry School of ScienceAzzahra UniversityVanakTehranIran

Sulfonic acid-functionalized silica-coated nano-Fe3O4 particles(Fe3O4@SiO2-SO3H) have been prepared as a novel heterogeneous acid using a facile *** material was subsequently identified as an efficient catalyst for the synthesis of a variety of tetraketone derivatives via the Knoevenagel condensation and Michael addition reactions of aromatic aldehydes to dimedone,1,3-indanedione,and 1,3-dimethyl barbituric *** catalyst could be readily recovered using a simple external magnet and reused several times without any significant loss in *** current catalytic process is both sustainable and economical because it operates under aqueous conditions,the catalyst can be recovered and reused,and the reactions themselves require only a short time and provide the products in high yield.

关键词： LFCO XRD 化学化学动力学

基于信息势能的鲁棒估计器及其在同时定位与地图构建问题中的应用

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控制理论与应用 2011年第7期28卷 901-906页

作者：刘龚任雪梅 A.B.rad 北京理工大学自动化科学院北京100081 西蒙菲沙大学机械电子系加拿大素里V3T0A3

提出了一种基于信息势能鲁棒估计器来解决机器人室内的同时定位与地图构建(SLAM)问题.结构化的室内环境可以用线段近似表示.然而动态环境中,测距传感器测得的数据通常湮没在大量的噪声信号中.本文采用"分割与合并"(split-and-merge)方... 详细信息

提出了一种基于信息势能鲁棒估计器来解决机器人室内的同时定位与地图构建(SLAM)问题.结构化的室内环境可以用线段近似表示.然而动态环境中,测距传感器测得的数据通常湮没在大量的噪声信号中.本文采用"分割与合并"(split-and-merge)方法进行线段的分类,根据信息势能的性能指标衡量每个采样数据对该线段的信息贡献量.按照信息优化理论设计估计器,选择信息量贡献大的样本点作为信息内点提取线段参数,构建局部地图.采用粒子滤波器进行地图及机器人路径的更新.采用递推的方法估计信息势能,降低了对样本点的信息量贡献做估计时的复杂度.仿真和实验结果证明.本文所提出的方法具有较强的鲁棒性,提高了SLAM策略的准确性和实时性.

关键词：信息势能自主机器人鲁棒估计定位与地图构建