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Your search keyword '"Mohammad Reza Yavari"' showing total 7 results
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7 results on '"Mohammad Reza Yavari"'

1. Simulation of the Reactive Powder Concrete (RPC) Behavior Reinforcing with Resistant Fiber Subjected to Blast Load

Author

Habib Akbarzadeh Bengar and Mohammad Reza Yavari

Subjects
reactive powder concrete (rpc), blast load, analytical simulation, explosion charge, explosion point, Technology, Engineering (General). Civil engineering (General), TA1-2040
Abstract

In research or experimental works related to blast loads, the amount of explosion material and distance of explosion point are very important. So, in this paper has been attempted to present a parametric study of the reactive powder concrete subjected to blast load. The effect of the different amount of TNT adopted the literature, distance of explosion point from RPC slab and also the location of explosion charge (horizontal and vertical coordinates form the center of specimens) has been investigated. In order to the analytical simulation of RPC behavior against blast and also the accuracy of acquired results, at first using ABAQUS software, a RPC slab studied in the literature has been verified. The obtained results are showed that the simulated model of RPC is match with literature one. In the next stage, a case study of the effect of explosion charge and also the distance of explosion point from RPC and NSC (normal strength concrete) slabs have been examined, and the results have been compared. It’s noted that the NSC slab is supposed to be a reinforced concrete, whereas 2% volume of special short steel fibers were used in the RPC specimen. The acquired results have been showed that the RPC have better blast explosion resistance than reinforced normal strength concrete.

Published
2016
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4. The impact of religious cognitive behavioural therapy (RCBT) on general health among Iranians

Author

Seyed Mojtaba Yassini Ardekani, Jafar Amin Moghadam, Mohammad Reza Yavari, Seid Saeed Mazloomy Mahmoodabad, Mohammad Reza Rezaei, Maryam Alagheband, and Hossein Fallahzadeh

Subjects
Clinical trial, 050103 clinical psychology, Psychiatry and Mental health, Clinical Psychology, 05 social sciences, 050109 social psychology, 0501 psychology and cognitive sciences, Cognition, General health, Psychology, Clinical psychology
Abstract

The aim of this study was to determine the efficacy of religious cognitive behavioural therapy (RCBT) on general health among Iranians. This study was a randomised, single-blinded clinical trial fr...

Published
2019

5. Construction and validation of the Urban Quality of Life Scale with Islamic dimensions among Iranians

Author

Hossein Fallahzadeh, Seyed Mojtaba Yassini Ardekani, Mohammad Reza Yavari, Jafar Amin Moghadam, Seyed Saeed Mazloomy Mahmoodabad, Maryam Alagheband, and Mohammad Reza Rezaeib

Subjects
05 social sciences, 0211 other engineering and technologies, 021107 urban & regional planning, 050109 social psychology, Sample (statistics), Islam, 02 engineering and technology, Variance (accounting), Quality of life scale, humanities, Psychiatry and Mental health, Clinical Psychology, Quality of life (healthcare), Cronbach's alpha, Statistics, 0501 psychology and cognitive sciences, Cluster sampling, Psychology, Reliability (statistics)
Abstract

The aim of this study was to make and validate the Urban Quality of Life Scale (UQLS) with Islamic dimensions. This was a cross-sectional study with the descriptive-correlational method. The sample consisted of 383 Iranian Muslims (217 males, 166 females) from Yazd/Iran who was selected by multi-stage cluster sampling. Also, a subsample of 30 participants was selected to test–retest reliability in a separate study. Factor analysis results showed that UQLS is a multidimensional tool with four factors which are social, environmental, economical, and physical according to the variance percentage of Eigenvalue. Item-rest correlations (.44–.88), Cronbach’s alphas (.76–.92), and test–retest coefficients (.68–.84) were suggested good reliability of the UQLS. Finally, the results indicate that the UQLS is an effective tool for evaluating the Urban Quality of Life with Islamic dimensions in the Iranian population.

Published
2018

6. Determining the Effects of Machining Parameters and Modifier on Surface Roughness in Dry Turning of Al-20%Mg2Si-PMMC using Design of Experiments (DOE)

Author

Mohammad Reza Yavari, Noordin Mohd Yusof, and Abbas Razavykia

Subjects
Matrix (chemical analysis), Engineering drawing, Materials science, Machining, Artificial Intelligence, Design of experiments, Machinability, Composite number, Surface roughness, Fracture (geology), Composite material, Industrial and Manufacturing Engineering, Reliability (statistics)
Abstract

The machinability of particulate metal matrix composites (PMMC) is influenced by the matrix mechanical properties as well as size, distribution and volume fracture of reinforcement particles. In order to machine different PMMCs, especial machining conditions based on the type of operation must be considered. The main principle aim of this observation is to assess the effect of machining parameters involving cutting speed, feed rate and Strontium addition on surface roughness of Al-20%Mg2Si in-situ composite. In this study design of experiment (DOE) methodology was applied to design experimental trials and the results were analyzed using Analysis of Variance (ANOVA). The dry turning was done on ALPHA 1350S CNC lath machine with a new insert for each test to ensure accurate reporting. The results showed that the Mg2Si particles morphology such as size, shape and distributions have altered by Sr addition. The statistical analysis revealed that all main effects influenced the surface roughness. The predicted results are found to be so closer to actual results. Due to low proximity difference between predicted results and actual results with each other, based on confirmation tests, the predictive model is sufficient accurate at reliability of 95%.

Published
2015
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