Search results for: Ali Nazari

Items from 1 to 20 out of 159 results

article

An experimental investigation on the flexural and wear properties of multiscale nanoclay/basalt fiber/epoxy composites

Ali Nazari

Polymer Composites > 42 > 11 > 5755 - 5762

In this work, multiscale basalt fiber/epoxy composites were fabricated using silane‐modified Na⁺‐montmorillonite nanoclay, at various contents (0.5, 1, 3, and 5 wt% with respect to the matrix). Flexural and tribological characteristics of the composites were studied. First of all, a silane coupling agent, namely 3‐aminopropyltriethoxysilane (3‐APTS), was applied onto the surface of the nanoclay particles,...

article

Post-fire impact behavior and durability of steel fiber-reinforced concrete containing blended cement-zeolite and recycled nylon granules as partial aggregate replacement

Mahdi Nematzadeh, Ali Nazari, Morteza Tayebi

Archives of Civil and Mechanical Engineering > 2022 > Vol. 22, no. 1 > art. no. e5, 2022

Recycling polymeric waste in concretes to replace a portion of the stone aggregate volume can improve some of the mechanical features of concrete such as impact resistance, while also helping mitigate the associated environmental problems. Thus, this research was aimed at exploring the combined effect of nylon granules (0, 10, and 20%) as a replacement for fine aggregate, steel fibers (0, 0.75, and...

article

Homogeneous Coatings of Titanium Dioxide Nanoparticles on Corona-Treated Cotton Fabric for Enhanced Self-Cleaning and Antibacterial Properties

Mojtaba Aalipourmohammadi, Abolfazl Davodiroknabadi, Ali Nazari

Autex Research Journal > 2021 > Vol. 21, no. 1 > 101--107

This study discusses the effect of corona pretreatment and subsequent loading of titanium dioxide nanoparticles on self-cleaning and antibacterial properties of cellulosic fabric. The corona-pretreated cellulosic fabrics were characterized by fi eld emission scanning electron microscopy, and X-ray mapping techniques revealed that layers of the titania deposited on cellulose fi bers were more uniform...

article

Transcranial near-infrared photobiomodulation could modulate brain electrophysiological features and attentional performance in healthy young adults

Ali Jahan, Mohammad Ali Nazari, Javad Mahmoudi, Farzad Salehpour, more

Lasers in Medical Science > 2019 > 34 > 6 > 1193-1200

The aim of the present study was to investigate the electrophysiological effects of the photobiomodulation (PBM) by the quantitative electroencephalography (qEEG) as a diagnostic method. The neurotherapeutic potential of transcranial PBM has been recently investigated in preclinical and clinical studies. According to the PBM mechanisms of action on increasing the cerebral blood flow and the neuronal...

article

Fibre-reinforced boroaluminosilicate geopolymers: A comparative study

Ali Bagheri, Ali Nazari, Jay G. Sanjayan

Ceramics International > 2018 > 44 > 14 > 16599- 16605

This paper investigates the effect of fibres on the physical and mechanical behaviour of boroaluminosilicate geopolymers (BASG) compared to conventional aluminosilicate binders. The use of various types of fibres by the means of reinforcing geopolymers against flexural loads is very common. In this work, fly ash and ground granulated blast furnace slag (GGBS) are utilised as raw materials to generate...

article

The behaviour of iron in geopolymer under thermal shock

Ali Nazari, Ali Bagheri, Melissa Dao, Chathumini Mallawa, more

Construction and Building Materials > 2017 > 150 > C > 248-251

In this paper, alkali-activated fly ash (geopolymer) samples were microstructurally analysed after thermal shock. The prepared samples were heated at 1000°C, and then quenched in water to room temperature. X-ray diffraction (XRD), and energy dispersive spectroscopy (EDS) were used to analyse the samples. The colour of the interior and exterior section of samples were different, where the former was...

article

Alkali activated materials vs geopolymers: Role of boron as an eco-friendly replacement

Ali Bagheri, Ali Nazari, Jay G. Sanjayan, Pathmanathan Rajeev

Construction and Building Materials > 2017 > 146 > C > 297-302

In this paper, the influence of boron ions on the strength development and microstructure variations of fly ash-based geopolymers and alkali-activated slag (AAS) was investigated through utilizing borax-based alkali-activators. In addition to cost-effective aspects, the substitution of boron ions in geopolymer and AAS matrixes meant to minimize the downside of the silicate compounds on the environment...

article

Fuel Cell Power Management Using Genetic Expression Programming in All-Electric Ships

Alireza Tashakori Abkenar, Ali Nazari, Shantha D. Gamini Jayasinghe, Ajay Kapoor, more

IEEE Transactions on Energy Conversion > 2017 > 32 > 2 > 779 - 787

All-electric ships (AES) are considered as an effective solution for reducing greenhouse gas emissions as they provide a better platform to use alternative clean energy sources such as fuel cells (FC) in place of fossil fuel. Even though FCs are promising alternative, their response is not fast enough to meet load transients that can occur in ships at sea. Therefore, high-density rechargeable battery...

article

Modified 3D printed powder to cement-based material and mechanical properties of cement scaffold used in 3D printing

Pshtiwan Shakor, Jay Sanjayan, Ali Nazari, Shami Nejadi

Construction and Building Materials > 2017 > 138 > Complete > 398-409

Additive manufacturing is a common technique used to produce 3D printed structures. These techniques have been used as precise application geometry in different fields such as architecture and medicine, and the food, mechanics and chemical industries. However, in most cases only a limited amount of powder has been used to fabricate scaffold (structure). In this study, a unique mix of cements (calcium...

article

Asymptotic Distribution of the Sum of Skew-Normal Random Variables: Application in Data Envelopment Analysis

Ali Nazari, Mohammad Hassan Behzadi

Iranian Journal of Science and Technology, Transactions A: Science > 2017 > 41 > 1 > 199-207

This paper provided the asymptotic distribution of the sum of random variables with skew-normal (SN) distribution and used it in data envelopment analysis (DEA). DEA is a nonparametric approach to evaluate the efficiency of decision-making units using mathematical programming techniques. DEA in previous studies with stochastic data is often assumed that the input and output variables are normally...

chapter

A constructive genetic algorithm for LBP in face recognition

Ali Nazari, Saeed Bagheri Shouraki

2017 3rd International Conference on Pattern Recognition and Image Analysis (IPRIA) > 182 - 188

2017 3rd International Conference on Pattern Recognition and Image Analysis (IPRIA)

LBP coefficients are essential and determine the priority of gray differences. The objectives of this paper are to reveal this and propose a method for finding an optimal priority through the genetic algorithm. On the other hand, the genetic operators such as initialization and cross-over operators, generate invalid coefficients, defective chromosomes. This paper also recommends a rectifying method...

article

Fly ash-based boroaluminosilicate geopolymers: Experimental and molecular simulations

Ali Bagheri, Ali Nazari, Jay G. Sanjayan, Pathmanathan Rajeev, more

Ceramics International > 2017 > 43 > 5 > 4119-4126

Geopolymers are cement-free construction materials which are produced by mixing an aluminosilicate source such as fly ash with an alkali activator. Despite their eco-friendly nature, geopolymers suffer the negative impact of the sodium silicate part of the alkali activator on the environment. The use of borax, one of the eco-friendly salts of boric acid, as an activator can potentially lead to the...

article

Microstructure, electrical and mechanical properties of steel fibres reinforced cement mortars with partial metakaolin and limestone addition

Graciela Lopez Alvarez, Ali Nazari, Ali Bagheri, Jay G. Sanjayan, more

Construction and Building Materials > 2017 > 135 > C > 8-20

This paper investigates binary and ternary binders of ordinary Portland cement, metakaolin and limestone as a possible solution to reduce the amount of cement content in mortar mixes. Furthermore, the mortar mixtures were reinforced with steel fibres and their properties were investigated. The effectiveness of metakaolin and limestone on compressive and flexural strength of mortar samples as mechanical...

article

Real-time ocular artifacts removal of EEG data using a hybrid ICA-ANC approach

Aysa Jafarifarmand, Mohammad-Ali Badamchizadeh, Sohrab Khanmohammadi, Mohammad Ali Nazari, more

Biomedical Signal Processing and Control > 2017 > 31 > C > 199-210

Removal of ocular artifacts (OA) in real-time is an essential component in electroencephalography (EEG) based brain computer interface (BCI) applications. However, many proposed artifact removal methods are not applicable in real-time applications due to their time-consuming process. In this paper we propose a hybrid approach based on a new combination of independent component analysis (ICA) and adaptive...

article

Identification of nontuberculous mycobacteria by high-performance liquid chromatography from patients in tehran

Ali Mirzapour, Ali Nazari Alam, Saeed Z. Bostanabadi, Abdolrazagh H. Shahraki, more

International Journal of Mycobacteriology > 2016 > 5 > S1 > S214

The genus Mycobacterium contains over 140 species comprises pathogenic and nonpathogenic strains. Nontuberculous mycobacteria (NTM) causing clinical disease have become increasingly common and more diverse. Widespread features of NTM infection can make the diagnosis difficult. Precise species-level detection can aid in distinguishing environmental contamination from actual infection and, furthermore,...

article

Fractional-Order Adaptive Backstepping Control of Robotic Manipulators in the Presence of Model Uncertainties and External Disturbances

Nazila Nikdel, Mohammadali Badamchizadeh, Vahid Azimirad, Mohammad Ali Nazari

IEEE Transactions on Industrial Electronics > 2016 > 63 > 10 > 6249 - 6256

In this paper, the problem of finite-time stabilization and control of an n-degree of freedom (DOF) robotic manipulator is concerned. Factors such as model nonlinearity, uncertainties, and external disturbances can interfere in a closed-loop system performance. In order to attenuate these effects and improve the response characteristics of the system, a proper controller is developed. This paper is...

article

Suitability of Sarawak and Gladstone fly ash to produce geopolymers: A physical, chemical, mechanical, mineralogical and microstructural analysis

Hsiao Yun Leong, Dominic Ek Leong Ong, Jay G. Sanjayan, Ali Nazari

Ceramics International > 2016 > 42 > 8 > 9613-9620

Two types of fly ash sourced from Sarawak, Malaysia and Gladstone, Australia reflect differences in chemical compositions, mineral phase and particle size distributions. In this paper, the Sarawak fly ash was used to produce geopolymer in comparison to the well-developed Gladstone fly ash-based geopolymer. Characteristics of fly ash and mixtures proportions affecting compressive strength of the geopolymers...

article

Suitability of polyacrylamide superabsorbent polymers as the internal curing agent of well cement

Huajie Liu, Yuhuan Bu, Jay G. Sanjayan, Ali Nazari, more

Construction and Building Materials > 2016 > 112 > C > 253-260

The research objectives were designed to investigate polyacrylamide superabsorbent polymers as internal curing agent to mitigate autogenous shrinkage of well cement. Results show that poly acrylamide superabsorbent polymer hydrolyzes in alkaline circumstance of cement slurry at high temperature, which causes water absorption increase and then has negative effects on thickening and compressive strength...

article

Amphoteric ion polymer as fluid loss additive for phosphoaluminate cement in the presence of sodium hexametaphosphate

Yuhuan Bu, Huajie Liu, Ali Nazari, Yingjun He, more

Journal of Natural Gas Science and Engineering > 2016 > 31 > C > 474-480

The fluid loss of modified aluminate phosphate cement system with excellent CO₂ resistant ability cannot meet the demand of cementing engineering and the conventional fluid loss additive lose effectiveness in this cement system. The aim of this paper is to reveal the failure mechanisms of the conventional fluid loss additive and develop one kind of amphoteric ion polymer to control the fluid loss...

article

The effect of different Na2O and K2O ratios of alkali activator on compressive strength of fly ash based-geopolymer

Hsiao Yun Leong, Dominic Ek Leong Ong, Jay G. Sanjayan, Ali Nazari

Construction and Building Materials > 2016 > 106 > C > 500-511

Fly ash sourced from Sarawak, Borneo was alkali-activated by a combination of alkali hydroxides (i.e. NaOH, KOH or Ca(OH)₂) and sodium silicate (i.e. industrial or commercial grade Na₂SiO₃) in this research. A comprehensive overview of the compressive strength of geopolymer due to different alkali activator/fly ash and Na₂SiO₃/NaOH (Na₂SiO₃/KOH or Na₂SiO₃/Ca(OH)₂) were studied. The results show that...

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INFONA - science communication portal

Search results for: Ali Nazari

An experimental investigation on the flexural and wear properties of multiscale nanoclay/basalt fiber/epoxy composites

Post-fire impact behavior and durability of steel fiber-reinforced concrete containing blended cement-zeolite and recycled nylon granules as partial aggregate replacement

Homogeneous Coatings of Titanium Dioxide Nanoparticles on Corona-Treated Cotton Fabric for Enhanced Self-Cleaning and Antibacterial Properties

Transcranial near-infrared photobiomodulation could modulate brain electrophysiological features and attentional performance in healthy young adults

Fibre-reinforced boroaluminosilicate geopolymers: A comparative study

The behaviour of iron in geopolymer under thermal shock

Alkali activated materials vs geopolymers: Role of boron as an eco-friendly replacement

Fuel Cell Power Management Using Genetic Expression Programming in All-Electric Ships

Modified 3D printed powder to cement-based material and mechanical properties of cement scaffold used in 3D printing

Asymptotic Distribution of the Sum of Skew-Normal Random Variables: Application in Data Envelopment Analysis

A constructive genetic algorithm for LBP in face recognition

Fly ash-based boroaluminosilicate geopolymers: Experimental and molecular simulations

Microstructure, electrical and mechanical properties of steel fibres reinforced cement mortars with partial metakaolin and limestone addition

Real-time ocular artifacts removal of EEG data using a hybrid ICA-ANC approach

Identification of nontuberculous mycobacteria by high-performance liquid chromatography from patients in tehran

Fractional-Order Adaptive Backstepping Control of Robotic Manipulators in the Presence of Model Uncertainties and External Disturbances

Suitability of Sarawak and Gladstone fly ash to produce geopolymers: A physical, chemical, mechanical, mineralogical and microstructural analysis

Suitability of polyacrylamide superabsorbent polymers as the internal curing agent of well cement

Amphoteric ion polymer as fluid loss additive for phosphoaluminate cement in the presence of sodium hexametaphosphate

The effect of different Na2O and K2O ratios of alkali activator on compressive strength of fly ash based-geopolymer

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