Survey Effect Of Deoxidation Of Simple Carbon Steel Feeding In Sand Mold

, M.Sc. Thesis Sharif University of Technology Morshed, Sobhan (Author) ; Davami, Parviz (Supervisor) ; Varahram, Naser (Supervisor)

Abstract

Prevent shrinkage and porosity in the melting parts expensive attention has been cast as a piece of low cost healthy and free from defects in casting production. Calculated feeding distance and the required number of risers. Also ensure that more tests were done with computer simulation compared the results acceptable to have the cast and expensive to produce a piece has nearly no troubleshooting. Variety of factors can affect the riser effect is melting parts Read some of these factors include alloy melting, superheat and mold .... . Oxygen factor in the project as one of the molten factors between feeding distance for molten plain carbon steel melting components and parts reviews and...

Buckling behavior of the anchored steel tanks under horizontal and vertical ground motions using static pushover and incremental dynamic analyses

, Article Thin-Walled Structures ; Volume 112 , 2017 , Pages 173-183 ; 02638231 (ISSN) Sobhan, M. S ; Rahimzadeh Rofooei, F ; Khajeh Ahmad Attari, N ; Sharif University of Technology

Elsevier Ltd 2017

Abstract

This paper investigates the static and dynamic buckling of an anchored cylindrical steel tank subjected to horizontal and vertical ground acceleration. The buckling capacity of the tank is estimated using static pushover (SPO) and incremental dynamic analyses (IDA). Appropriate load patterns due to the horizontal and vertical components of ground excitations are utilized for SPO analyses. The buckling capacity curves and critical buckling loads computed using SPO analyses are compared to those obtained from IDA. A proper vertical to horizontal acceleration ratio (av/ah) for SPO analysis is proposed that leads to good agreement between SPO and IDA results. © 2017

Abortion stigma, government regulation and religiosity: findings from the case of Iran

, Article Journal of Economic Studies ; 2023 ; 01443585 (ISSN) Rasoulyan, F ; Mirnezami, R ; Khalili Nasr, A ; Morshed Behbahani, B ; Sharif University of Technology

Emerald Publishing 2023

Abstract

Purpose: Experiencing stigma after abortion may decelerate the accumulation of human capital. Despite the importance of studying the relationship between religiosity and abortion stigma, the topic is understudied, especially in Islamic contexts. Abortion was legalized in Iran in 2005. Under the new law, far more cases are allowed for abortion. This change provided an opportunity to explore the interplay of abortion stigma, legalization and religiosity in Iran. Design/methodology/approach: Using regression analysis based on 291 completed questionnaires from two cities in Iran, this study analyzes the relation between abortion stigma level and religiosity in Iran, controlling for contextual...

A new hybrid model using step-wise weight assessment ratio analysis (SWARA) technique and adaptive neuro-fuzzy inference system (ANFIS) for regional landslide hazard assessment in Iran

, Article Catena ; Volume 135 , 2015 , Pages 122-148 ; 03418162 (ISSN) Dehnavi, A ; Aghdam, I. N ; Pradhan, B ; Morshed Varzandeh, M. H ; Sharif University of Technology

Elsevier 2015

Abstract

In recent years, Iran has experienced many landslides due to high tectonic activity, and a variety of geological and climatic conditions. This paper proposes a novel hybrid model based on step-wise weight assessment ratio analysis (SWARA) method and adaptive neuro-fuzzy inference system (ANFIS) to evaluate landslide susceptible areas using geographical information system (GIS). At first, based on an inventory map, landslide locations were randomly divided into two parts, 70% of which were used for generating the landslide hazard map and 30% of which were used for the validation of the model. Then, twelve landslide predisposing factors, such as lithology, slope angle, slope aspect, plan...

Investigating the Effect of Soil-Structure Interaction on the Buckling Behavior of Anchored Steel Cylindrical Tanks using Absorbing Boundaries

, M.Sc. Thesis Sharif University of Technology Khaki, Taha (Author) ; Rahimzadeh Rofooei, Fayaz (Supervisor) ; Sobhan, Mohammad Saeed (Supervisor)

Abstract

This research investigates the effect of soil-structure interaction on the buckling behavior of an above-ground storage tanks. For this purpose, a steel tank with a height-to-diameter ratio of 0.4 was selected. Four types of support conditions including a fixed-based condition and three soil islands with a depth of 30 meters, assuming a uniform stiff soil and a two-layered soil consisting of stiff and medium soil, and a three-layer soil with stiff, medium, and soft layers. The tank and soil were modeled using the finite element method, and absorbing boundaries were applied around the soil island to simulate the semi-infinite soil domain. After validating the modeling through parametric and...

Modeling of Heat Transfer Mechanism in Porous Media Combustion Chamber

, M.Sc. Thesis Sharif University of Technology Arzhangnia, Yousef (Author) ; Ghafourian Morshed Yazdi, Akbar (Supervisor) ; Saeedi, Mohammad Hassan (Supervisor)

Abstract

Combustion procedure in porous media is of great importance and also has numerous technical applications. Currently several usages of porous burners in thermodynamic engineering and thermal industries have been identified, in which they perform based on stabilized combustion in porous media. Among the advantages that porous burners have over conventional burners are pollution reduction, decrease in burner dimension, enhanced flame stabilization and also noise reduction.
According to physical and chemical attributes of porous material, combustion can occur in one of the three main types of media including: inert, catalytic, combustible. The concepts mentioned in this proposal are...

Seismic Response and Buckling behavior of Aboveground Cylindrical Steel Tanks

, Ph.D. Dissertation Sharif University of Technology Sobhan, Mohammad Saeed (Author) ; Rahimzadeh Rofooei, Fayaz (Supervisor) ; Khaje Ahmad Attari, Nader (Co-Advisor)

Abstract

In this study, the seismic response of aboveground, anchored cylindrical steel tanks subjected to horizontal and vertical ground acceleration is investigated. The buckling capacity of the steel tanks is estimated using static pushover (SPO) and incremental dynamic analyses (IDA). Finite element models of a broad tank and a tall tank with height to diameter ratios (H/D) of 0.40, 0.80 and with a liquid level of 90% of the height of the cylinder were used in this study. Appropriate load patterns due to the horizontal and vertical components of ground excitations are utilized for SPO analyses. The influence of the vertical component of ground acceleration on buckling capacity curve of the tank...