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Probabilistic stability of uncertain composite plates and stochastic irregularity in their buckling mode shapes:A semi-analytical non-intrusive approach

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Frontiers of Structural and Civil Engineering 2023年第2期17卷 179-190页

作者： Arash Tavakoli MALEKI hadi parviz Akbar A.KHATIBI Mahnaz ZAKERI Advanced Structures Research Laboratory K.N.Toosi University of TechnologyTehran 16569-83911Iran Faculty of New Sciences and Technologies University of TehranTehran 16569-83911Iran School of Engineering RMIT UniversityMelbourne VIC 3001Australia

In this study,the mechanical properties of the composite plate were considered Gaussian random fields and their effects on the buckling load and corresponding mode shapes were studied by developing a semi-analytical nonintrusive *** random fields were decomposed by the Karhunen−Loève *** strains were defined based on the assumptions of the first-order and higher-order shear-deformation *** equations of motion were extracted using Euler-Lagrange *** probabilistic response space was obtained by employing the nonintrusive polynomial chaos ***,the effect of spatially varying stochastic properties on the critical load of the plate and the irregularity of buckling mode shapes and their sequences were studied for the first *** findings showed that different shear deformation plate theories could significantly influence the reliability of thicker plates under compressive *** is suggested that a linear relationship exists between the mechanical properties’variation coefficient and critical loads’variation ***,in modeling the plate properties as random fields,a significant stochastic irregularity is obtained in buckling mode shapes,which is crucial in practical applications.

关键词： uncertain composite plate stochastic assume mode method Karhunen−Loève theorem polynomial chaos approach plate buckling irregularity in buckling mode shapes

Cracks coalescence mechanism and cracks propagation paths in rock-like specimens containing pre-existing random cracks under compression

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Journal of Central South University 2014年第6期21卷 2404-2414页

作者： hadi Haeri Kourosh Shahriar Mohammad Fatehi Marji parviz Moarefvand Department of Mining Engineering Science and Research BranchIslamic Azad University Department of Mining and Metallurgical Engineering Amirkabir University of Technology Mine Exploitation Engineering Department Faculty of Mining and MetallurgyInstitution of EngineeringYazd University

The mechanism of cracks propagation and cracks coalescence due to compressive loading of the brittle substances containing pre-existing cracks （flaws） was modeled experimentally using specially made rock-like specimens from Portland Pozzolana Cement （PPC）. The breakage process of the specimens was studied by inserting single and double flaws with different inclination angles at the center and applying uniaxial compressive stress at both ends of the specimen. The first crack was oriented at 50＆#176; from the horizontal direction and kept constant throughout the analysis while the orientation of the second crack was changed. It is experimentally observed that the wing cracks are produced at the first stage of loading and start their propagation toward the direction of uniaxial compressive loading. The secondary cracks may also be produced in form of quasi-coplanar and/or oblique cracks in a stable manner. The secondary cracks may eventually continue their propagation in the direction of maximum principle stress. These experimental works were also simulated numerically by a modified higher order displacement discontinuity method and the cracks propagation and cracks coalescence were studied based on Mode I and Mode II stress intensity factors （SIFs）. It is concluded that the wing cracks initiation stresses for the specimens change from 11.3 to 14.1 MPain the case of numerical simulations and from 7.3 to 13.8 MPa in the case of experimental works. It is observed that cracks coalescence stresses change from 21.8 to 25.3 MPa and from 19.5 to 21.8 MPa in the numerical and experimental analyses, respectively. Comparing some of the numerical and experimental results with those recently cited in the literature validates the results obtained by the proposed study. Finally, a numerical simulation was accomplished to study the effect of confining pressure on the crack propagation process, showing that the SIFs increase and the crack initiation angles change in this case.

关键词： crack propagation crack coalescence rock-like specimen numerical simulation experiment

Application of graphite screen printed electrode modified with dysprosium tungstate nanoparticles in voltammetric determination of epinephrine in the presence of acetylcholine

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Journal of Rare Earths 2018年第7期36卷 750-757页

作者： hadi Beitollahi Zahra Dourandish Somayeh Tajik Mohammad Reza Ganjali parviz Norouzi Farnoush Faridbod Environment Department Irtstitute of Science and High Technology and Environmental SciencesGraduate University of Advanced Technology Department of Chemistry Graduate University of Advanced Technology NanoBioElectrochemistry Research Center Bam University of Medical Scicnce Center of Excellence in Electrochemistry Faculty of ChemistryUniversity of Tehran Biosensor Research Center Endocrinology & Metabolism Molecular-Cellular Sciences InstituteTehran University of Medical Sciences

The current work focuses on the development of a sensitive and selective electrochemical device based on a graphite screen printed electrode modified with Dy2（WO4）3 nanoparticles（DWO/SPE） for the analysis of epinephrine in samples also containing acetylcholine. The study proves that the sensor has excellent electron-mediating behavior in the oxidation of epinephrine in a 0.1 mol/L phosphate buffer solution（PBS）（pH 7.0）. The application of the DWO/SPE in differential pulse voltammetry（DPV） is found to lead to distinct response for the oxidation of epinephrine and acetylcholine, with the potentials of the epinephrine and acetylcholine peaks（△Ep） to be 550 mV apart. The detection limits of the method for epinephrine and acetylcholine are 0.5 and 0.7 μmol/L（S/N = 3） and the responses are found to be linear in the concentration ranges of 1.0-900.0 μmol/L and 1.0-1200.0 μmol/L in a PBS buffer（pH = 7.0）respectively. The modified electrode was used for the detection of epinephrine and acetylcholine in real samples and found to produce satisfactory results. These results can be a proof that Dy2（WO4）3 nanoparticles can find promising applications in electrochemical sensors to be used for the analysis of（bio）chemical species.

关键词： Epinephrine Acetylcholine Dy2(WO4)3 nanoparticles Graphite screen printed electrode Rare earths

Combination therapy using evening primrose oil and electrical stimulation to improve nerve function following a crush injury of sciatic nerve in male rats

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Neural Regeneration Research 2017年第3期12卷 458-463页

作者： Omid Badri parviz Shahabi Jalal Abdolalizadeh Mohammad Reza Alipour hadi Veladi Mehdi Farhoudi Mohsen Sharif Zak Tabriz University of Medical Sciences International Branch ArasTabrizIran Neuroscience Research Center Tabriz University of Medical SciencesTabrizIran Immunology Research Center Tabriz University of Medical SciencesTabrizIran Drug Applied Research Center Tabriz University of Medical SciencesTabrizIran Microsystem Fabrication Laboratory Tabriz UniversityTabrizlran Department of Biochemistry Faculty of MedicineTabriz University of Medical SciencesTabrizIran

Peripheral nerve injuries with a poor prognosis are *** primrose oil（EPO） has beneficial biological effects and immunomodulatory *** electrical activity plays a major role in neural regeneration,the present study investigated the effects of electrical stimulation（ES）,combined with evening primrose oil（EPO）,on sciatic nerve function after a crush injury in *** anesthetized rats,the sciatic nerve was crushed using small haemostatic forceps followed by ES and/or EPO treatment for 4 *** recovery of the sciatic nerve was assessed using the sciatic functional *** changes of gastrocnemius muscle atrophy were investigated by light *** changes were assessed by the nerve conduction velocity of sciatic *** was used to determine the remyelination of the sciatic nerve following the *** ＋ ES,EPO,and ES obviously improved sciatic nerve function assessed by the sciatic functional index and nerve conduction velocity of the sciatic nerve at 28 days after *** of the peripheral nerve remyelination marker,protein zero（P0）,was increased in the treatment groups at 28 days after *** atrophy severity was decreased significantly while the nerve conduction velocity was increased significantly in rats with sciatic nerve injury in the injury ＋ EPO ＋ ES group than in the EPO or ES *** speaking,the combined use of EPO and ES may produce an improving effect on the function of sciatic nerves injured by a *** increased expression of P0 may have contributed to improving the functional effects of combination therapy with EPO and ES as well as the electrophysiological and histopathological features of the injured peripheral nerve.

关键词： nerve regeneration peripheral nerve injury sciatic nerve injury evening primrose oil electrical stimulation sciatic functional index cuff electrode neural regeneration

An Effort Towards Full Graphene Photodetectors

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Photonic Sensors 2022年第1期12卷 31-67页

作者： Farhad LARKI Yaser ABDI parviz KAMELI hadi SALAMATI Department of Physics Isfahan University of TechnologyIsfahan 84156-83111Iran Nanophysics Research Lab Department of PhysicsUniversity of TehranTehran 84156-83111Iran

Graphene as a truly 2-dimensional(2D)system is a promising candidate material for various optoelectronic *** graphene as the main building material in ultra-broadband photodetectors has been the center of extensive research due to its unique absorption spectrum which covers most of the electro-magnetic ***,one of the main challenges facing the wide application of pure graphene photodetectors has been the small optical absorption of monolayer *** novel designs were proposed to overcome this drawback,they often need complicated fabrication processes in order to integrate with the graphene *** this regard,fabrication of purely graphene photodetectors is a promising approach towards the manufacturing of simple,in expensive,and high photosensitive *** fabrication of full graphene photodetectors(FGPDs)is mainly based on obtaining an optimal technique for the growth of high quality graphene,modification of electronic and optical properties of the graphene,appropriate techniques for transfer of graphene from the grown substrate to the desire position,and a proper design for ***,the available states of the art techniques for each step of device fabrication,along with their pros and cons,are reviewed and the possible approaches for optimization of FGPDs have been proposed.

关键词： Graphene photodetectors graphene growth photodetection

Antimicrobial resistance pattern in ventilator-associated pneumonia in an intensive care unit of Babol, northern Iran

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Journal of Acute Disease 2018年第2期7卷 74-77页

作者： Mahmoud Sadeghi-Haddad-Zavareh hadi Ahmadi Jouybari Mostafa Javanian Mehran Shokri Masomeh Bayani Mohammad Reza Hasanjani Roushan Arefeh Babazadeh Soheil Ebrahimpour parviz Amri Maleh Infectious Diseases and Tropical Medicine Research Center Health Research InstituteBabol University of Medical SciencesBabolI.R.Iran Department of Anesthesiology School of MedicineBabol University of Medical SciencesBabolI.R.Iran

Objective:To investigate antibiotic resistance pattern of ventilator-assiated pneumonia (VAP) generating microorganisms,and quantitative culture and determining antibiotic ***:This cross sectional study was performed on 50 patients suffering from VAP in intensive care unit of Ayatollah Rouhani Hospital,Babol,Iran during *** was probable for them based on clinical signs and the criteria of Clinical Pulmonary Infection Score *** respiratory samples were given under bronchoalveolar lavage and quantitative culture was done on *** by microdilution method,minimal inhibitory concentration based on respective microorganisms,considering clinical pulmonary infection score were ***:From 50 investigated samples in this study,the most common microorganisms were Acinetobacter baumannii (***) (70%) then Pseudomonas aeruginosa (12%),Staphylococcus aureus (8%) and Klebsiella pneumonia (3%).In our study *** showed approximate 100% resistance to all antibiotics,in a way that *** resistance to imipenem and meropenem and piperacillin/tazobactam each was 97.1%.The most resistance of Pseudomonas aeruginosa was 66.7% to each cefepime and ceftazidime and clavulanate/*** aureus showed 75% resistance to nafcillin,cloxacillin and resistance in case of vancomycin was not ***:In current study,*** had the most prevalence among VAP and this species is resistant to most of *** ceftazidime,cefepime and clavulanate/ticarcillin,in treatment of the patients suffering VAP is not reasonable.

关键词： Antibacterial resistant Ventilator-associated pneumonia Intensive care unit

Erratum to: Cracks coalescence mechanism and cracks propagation paths in rock-like specimens containing pre-existing random cracks under compression

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Journal of Central South University 2014年第10期21卷 4052-4052页

作者： hadi Haeri Kourosh Shahriar Mohammad Fatehi Marji parviz Moarefv Department of Mining Engineering Science and Research Branch Islamic Azad University Department of Mining and Metallurgical Engineering Amirkabir University of Technology Mine Exploitation Engineering Department Faculty of Mining and Metallurgy Institution of EngineeringYazd University

Erratum to:*** Univ.(2014)21:2404-2414DOI:10.1007/s11771-014-2194-yThe original version of this article unfortunately contained a *** E-mail addresses of the corresponding author are *** corrected information of the c... 详细信息

关键词： Cracks coalescence mechanism and cracks propagation paths in rock-like specimens containing pre-existing random cracks under compression Erratum to