Search results for: A Shafiei

Items from 1 to 20 out of 26 results

article

How different are Te clusters—a first-principles study

V. S. Ghemud, H. A. Shafiei Gol, Anjali Kshirsagar

Journal of Nanoparticle Research > 2018 > 20 > 7 > 1-19

Density functional theory-based electronic structure calculations are carried out to obtain the geometries corresponding to the lowest three energy values for Te_y (y = 2 − 20) clusters. A comparison of the stability from binding energy curve of these clusters with exchange-correlation energy functional approximated within the local density approximation (LDA), generalized gradient approximation (GGA)...

article

A numerical simulation of the water vapor bubble rising in ferrofluid by volume of fluid model in the presence of a magnetic field

A. Shafiei Dizaji, M. Mohammadpourfard, H. Aminfar

Journal of Magnetism and Magnetic Materials > 2018 > 449 > C > 185-196

Multiphase flow is one of the most complicated problems, considering the multiplicity of the related parameters, especially the external factors influences. Thus, despite the recent developments more investigations are still required. The effect of a uniform magnetic field on the hydrodynamics behavior of a two-phase flow with different magnetic permeability is presented in this article. A single...

article

Dynamic crack propagation in plates weakened by inclined cracks: an investigation based on peridynamics

A. Shafiei

Frontiers of Structural and Civil Engineering > 2018 > 12 > 4 > 527-535

Peridynamics is a theory in solid mechanics that uses integral equations instead of partial differential equations as governing equations. It can be applied to fracture problems in contrast to the approach of fracture mechanics. In this paper by using peridynamics, the crack path for inclined crack under dynamic loading were investigated. The peridynamics solution for this problem represents the main...

article

A non-equilibrium relaxation model for fast depressurization of pipelines

A. Nouri-Borujerdi, A. Shafiei Ghazani

Annals of Nuclear Energy > 2018 > 111 > C > 1-11

In this paper, transient depressurization of high pressure pipelines containing initially subcooled liquid is simulated numerically by using thermodynamic non-equilibrium and choking condition model. The numerical method relies on finite volume. The convective terms of cell boundaries are discretized by Advection Upstream Splitting Method (AUSM+ - up) with a proposal of partially implicit approach...

article

Equilibrium and non‐equilibrium gas–liquid two phase flow in long and short pipelines following a rupture

A. Nouri‐Borujerdi, A. Shafiei Ghazani

AIChE Journal > 63 > 7 > 3214 - 3223

The two‐phase flow following the blowdown of pipeline carrying flashing liquid is numerically investigated by using thermodynamic equilibrium and non‐equilibrium models. Model equations are solved numerically by the finite volume method. The values of fluxes at cell boundaries are obtained by AUSM+‐up. To obtain proper values for the coefficients of dissipation, both single phase liquid and two phase...

article

A comparative study of the effects of constructional elements on the mechanical behaviour of dragonfly wings

H. Rajabi, M. Rezasefat, A. Darvizeh, J.-H. Dirks, more

Applied Physics A > 2016 > 122 > 1 > 1-13

Although wings of insects show a large variation in morphology, they are all made from a network of irregular veins interconnected through membranous areas. Depending on their shape, size, and position, wing veins are usually divided into three different groups: longitudinal veins, cross-veins and ambient veins. The veins together with the membrane and some other elements such as spines, nodus and...

article

Experimental investigation on the effect of hydrated lime on mechanical properties of SMA

A. Shafiei, M. Latifi Namin

Construction and Building Materials > 2014 > 70 > Complete > 379-387

One of the most important and costly damages to the pavements, especially in high traffic areas is rutting. An optimal use of lime is significantly important with regard to expensive cost of the lime and its improving properties in stone matrix asphalt (SMA). In this paper, simple performance tests (i.e. dynamic modulus, dynamic creep, and static creep) were used based on NCHRP-465 report. In which...

article

Experimental and numerical investigations of Otala lactea's shell–I. Quasi-static analysis

H. Rajabi, A. Darvizeh, A. Shafiei, Sh. Eshghi, more

Journal of the Mechanical Behavior of Biomedical Materials > 2014 > 32 > C > 8-16

At the first glance, mollusk shells may seem complex spatial structures with interesting shapes, forms and colors. However, from an engineering point of view, they are mechanical barriers which provide remarkable protection against environmental factors. These biological composites which exhibits an attractive combination of stiffness, strength and toughness, may be mimicked in bio-inspired materials...

article

Investigation of EEG changes during exposure to extremely low-frequency magnetic field to conduct brain signals

S. A. Shafiei, S. M. Firoozabadi, K. Rasoulzadeh Tabatabaie, M. Ghabaee

Neurological Sciences > 2014 > 35 > 11 > 1715-1721

There are evidences that confirm the effect of magnetic fields (MFs) on brain signals and some psychological disorders such as headache, migraine and depression. The aim of the present study was to investigate changes in EEG power spectrum due to localized exposure in different parts of the brain by extremely low-frequency magnetic fields (ELF-MFs) to extract some protocols for treatment of some psychological...

article

Experimental investigation of the effects of water electrolysis parameters on the amount of hydrogen damage in Pb(Zr,Ti)O₃

A. Shafiei, A. Alfantazi

Journal of Materials Science > 2014 > 49 > 2 > 519-526

Water electrolysis technique has been used in this work to investigate the interactions between hydrogen and Pb(Zr,Ti)O₃ (PZT), and the effects of water electrolysis parameters on the amount of hydrogen damage have been investigated. Microstructural investigations show that increasing the current density during water electrolysis will increase the amount of hydrogen damage, while increasing the voltage...

article

Multiple hydrocarbon charging events in Kuh‐e‐Mond oil field, Coastal Fars: evidence from biomarkers in oil inclusions

Z. Shariatinia, S. Feiznia, A. Shafiei, M. Haghighi, more

Geofluids > 13 > 4 > 594 - 609

Oil inclusions were retrieved from dolomite and calcite fracture fills in upper, middle and lower reservoir zones in Kuh‐e‐Mond Field, Zagros Basin, Iran. They are assumed to be persevered samples of primary oil; hence, their biomarkers were analysed to determine the maturity gradient and source facies of petroleum at the time of migration. A variety of specific parameters were obtained including...

article

Dielectric spectroscopy study of hydrogen treated lead zirconate titanate (Pb (Zr,Ti)O₃)

A. Shafiei, T. Troczynski

physica status solidi (a) > 210 > 6 > 1228 - 1231

Dielectric spectroscopy technique is used in this work to study the structural changes inside lead zirconate titanate (Pb (Zr,Ti)O₃ or PZT) exposed to hydrogen for 24 h at 550 °C, at constant pressure p = 0.13 bar. The results show that even after hydrogen treatment, there are still spontaneous dipoles (TiO or ZrO) inside the PZT. However, the dielectric constant is only about half of that of the...

article

Effect of porous alumina coatings on decreasing hydrogen damage to Pb(Zr,Ti)O3

A. Shafiei, C. Oprea, T. Troczynski

Surface & Coatings Technology > 2013 > 224 > Complete > 29-33

Alumina coatings were applied to Pb(Zr,Ti)O ₃ plates using the sol–gel technique, to explore the possibilities of decreasing the H ₂ damage to PZT. The coating process development cycle included dip coating in 10wt.% boehmite sol and firing at 450°C in air for 5h. The functionality of the coatings against hydrogen damage was evaluated using water electrolysis in 0.1M NaOH solution,...

article

E112 Single tract access in tubeless complete supine percutaneous nephrolithotomy for complex upper urinary tract stones

S. Falahatkar, A. Sobhani, K. Gholamjani Moghaddam, M. Mohiti Asli, more

European Urology Supplements > 2011 > 10 > 7 > 518-519

article

The frequency and predictors of helmet use among Iranian motorcyclists: A quantitative and qualitative study

Fereshteh Zamani-Alavijeh, M. Bazargan, A. Shafiei, Shahrzad Bazargan-Hejazi

Accident Analysis and Prevention > 2011 > 43 > 4 > 1562-1569

This study examines the rate of helmet use and identifies barriers and facilitators of wearing helmets among Iranian motorcyclists. A mixed-method approach was used, including a structured seasonal survey with specific observations of a random sample of 6010 riders and qualitative methods that included 29 in-depth interviews and seven focus groups (n=31).Only 10% of motorcyclists wear a standard helmet...

chapter

Velocity control of a PMLSM using a brain emotional learning based intelligent control strategy

P. Ghaebi Panah, A. Shafiei, A. Parsa Pour, B. Mirzaeian Dehkordi

2011 IEEE International Conference on System Engineering and Technology > 47 - 52

2011 IEEE International Conference on System Engineering and Technology (ICSET)

A velocity controller for a permanent magnet linear synchronous motor (PMLSM) is designed using a brain emotional learning based intelligent control (BELBIC). This is performed for a comprehensive nonlinear model of PMLSM including non-idealities such as detent force, parameter uncertainty, unpredicted disturbance, and nonlinear friction. As an evaluation criterion of the performance of the proposed...

chapter

An adaptive fuzzy sliding mode control of a permanent magnet linear synchronous motor for an inimical command velocity profile

P. Ghaebi Panah, M. Ataei, A. Shafiei

2011 IEEE International Conference on System Engineering and Technology > 41 - 46

2011 IEEE International Conference on System Engineering and Technology (ICSET)

An adaptive fuzzy variable structure velocity controller of a permanent magnet linear synchronous motor (PMLSM) is designed for a command profile which has rapid change in a wide range. This is performed for comprehensive nonlinear model of PMLSM including non-idealities such as detent force, parameter uncertainty, unpredicted disturbance, and nonlinear friction. The proposed method is based on the...

article

Wear assessment of Al/Al2O3 nano-composite surface layer produced using friction stir processing

A. Shafiei-Zarghani, S.F. Kashani-Bozorg, A. Zarei- Hanzaki

Wear > 2011 > 270 > 5-6 > 403-412

An innovative technique, friction stir processing (FSP) was employed for the fabrication of Al/Al ₂ O ₃ nano-composite surface layer on an Al alloy substrate. Aluminum work pieces with pre-placed nano-sized Al ₂ O ₃ powder which was filled in a shallow groove were subjected to various numbers of passes from one to four. Scanning electron microscopy studies showed that...

article

Radio labeling, quality control and biodistribution of ^99mTc-cefotaxime as an infection imaging agent

S. F. Mirshojaei, M. Gandomkar, R. Najafi, S. E. Sadat Ebrahimi, more

Journal of Radioanalytical and Nuclear Chemistry > 2011 > 287 > 1 > 21-25

Cefotaxime, a cephalosporin antibiotic, used to treat bacterial infections was investigated to label with ^99mTc. Labeling was performed using sodium dithionite as a reducing agent at 100 °C for 10 min and radiochemical analysis involved ITLC and HPLC methods. The stability of labeled antibiotic was checked in the presence of human serum at 37 °C up to 24 h. The maximum radiolabeling yield was 92 ± 2%...

article

An investigation of the microstructures and properties of metal inert gas and friction stir welds in aluminum alloy 5083

A R Yazdipour, A Shafiei M, H Jamshidi Aval

Sādhanā > 2011 > 36 > 4 > 505-514

Two different types of welds, Metal Inert Gas (MIG) and Friction Stir Welding (FSW), have been used to weld aluminum alloy 5083. The microstructure of the welds, including the nugget zone and heat affected zone, has been compared in these two methods using optical microscopy. The mechanical properties of the weld have been also investigated using the hardness and tensile tests. The results show that...

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INFONA - science communication portal

Search results for: A Shafiei

How different are Te clusters—a first-principles study

A numerical simulation of the water vapor bubble rising in ferrofluid by volume of fluid model in the presence of a magnetic field

Dynamic crack propagation in plates weakened by inclined cracks: an investigation based on peridynamics

A non-equilibrium relaxation model for fast depressurization of pipelines

Equilibrium and non‐equilibrium gas–liquid two phase flow in long and short pipelines following a rupture

A comparative study of the effects of constructional elements on the mechanical behaviour of dragonfly wings

Experimental investigation on the effect of hydrated lime on mechanical properties of SMA

Experimental and numerical investigations of Otala lactea's shell–I. Quasi-static analysis

Investigation of EEG changes during exposure to extremely low-frequency magnetic field to conduct brain signals

Experimental investigation of the effects of water electrolysis parameters on the amount of hydrogen damage in Pb(Zr,Ti)O₃

Multiple hydrocarbon charging events in Kuh‐e‐Mond oil field, Coastal Fars: evidence from biomarkers in oil inclusions

Dielectric spectroscopy study of hydrogen treated lead zirconate titanate (Pb (Zr,Ti)O₃)

Effect of porous alumina coatings on decreasing hydrogen damage to Pb(Zr,Ti)O3

E112 Single tract access in tubeless complete supine percutaneous nephrolithotomy for complex upper urinary tract stones

The frequency and predictors of helmet use among Iranian motorcyclists: A quantitative and qualitative study

Velocity control of a PMLSM using a brain emotional learning based intelligent control strategy

An adaptive fuzzy sliding mode control of a permanent magnet linear synchronous motor for an inimical command velocity profile

Wear assessment of Al/Al2O3 nano-composite surface layer produced using friction stir processing

Radio labeling, quality control and biodistribution of ^99mTc-cefotaxime as an infection imaging agent

An investigation of the microstructures and properties of metal inert gas and friction stir welds in aluminum alloy 5083

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