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Ali Ebrahimpoor Gorji,Zahra Eshaghi Gorji,Siavash Riahi 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.5
Different types of physical solvents have been utilized for CO2 removal from natural gas in the sweetening process. In this work, quantitative structure-property relationship (QSPR) method is suggested to build powerful models to predict Henry’s law constant (HLC) for CO2 in physical solvents. Modeling the HLC for CO2 as a function of molecular descriptors was achieved by multiple linear regression and descriptor selection was by genetic algorithm. The main proposed model has two simple descriptors, including the number of hydroxyl groups and molecular weight of solvents at fixed temperature. Also, the effect of temperature was studied, and this operational variable was added to the mentioned simple descriptors. In this case, the data set is comprised of 77 HLC for CO2 in solvents and at different temperatures. Several internal and external validation methods demonstrated the excellent ability for prediction, and the average relative deviation of main model was 6.48.
Micro-finite element and analytical investigations of seismic dampers with steel ring plates
Ali Mohammad Rousta,Mojtaba Gorji Azandariani 국제구조공학회 2022 Steel and Composite Structures, An International J Vol.43 No.5
This study investigated the yielding capacity and performance of seismic dampers constructed with steel ring plates using numerical and analytical approaches. This study aims to provide an analytical relationship for estimating the yielding capacity and initial stiffness of steel ring dampers. Using plastic analysis and considering the mechanism of plastic hinge formation, a relation has been obtained for estimating the yielding capacity of steel ring dampers. Extensive parametric studies have been carried out using a nonlinear finite element method to examine the accuracy of the obtained analytical relationships. The parametric studies include investigating the influence of the length, thickness, and diameter of the ring of steel ring dampers. To this end, comprehensive verification studies are performed by comparing the numerical predictions with several reported experimental results to demonstrate the numerical method's reliability and accuracy. Comparison is made between the hysteresis curves, and failure modes predicted numerically or obtained/observed experimentally. Good agreement is observed between the numerical simulations and the analytical predictions for the yielding force and initial stiffness. The difference between the numerical models' ultimate tensile and compressive capacities was observed that average of about 22%, which stems from the performance of the ring-dampers in the tensile and compression zones. The results show that the steel ring-dampers are exhibited high energy dissipation capacity and ductility. The ductility parameters for steel ring-damper between values were 7.5 to 4.1.
Ali Safavi,Mohsen Gorji,Roohollah Bagherzadeh,SAEEDEH MAZINANI,Masoud Latifi 한국섬유공학회 2023 Fibers and polymers Vol.24 No.11
In this research, the thermoregulation behavior of layered arrangement of fabric containing microencapsulated phase change materials (mPCMs) is mathematically modeled based on a previously developed theoretical model of monolayer fabric—mPCMs. This work considers a thermal range for mPCMs instead of just a melting point. The skin temperature is calculated for a simulated situation when a person moves from 35 to 0 °C atmosphere. The results show that the location of layers containing mPCMs has the primary effect on skin temperature. This study defines the effectiveness intensity index (EII) and effectiveness time index (ETI) to describe the dynamic thermal behavior of fabric settings. The proposed model, which is also validated by experimental results, can be used to estimate the thermal behavior of clothing systems containing mPCMs and design protective clothing systems with proper dynamic thermal insulation for different climates. This study presents the model that can be useful for design the garment layers containing mPCMs. Due to considering the melting range instead of just melting point for mPCMs, it seems that this simple model can predict the thermal behavior of garments close to real condition.
Ali Mohammad Rousta,Hamid Shojaeifar,Mojtaba Gorji Azandariani,Sajad Saberiun,Hamid Abdolmaleki 국제구조공학회 2021 Structural Engineering and Mechanics, An Int'l Jou Vol.80 No.2
The use of displacement-dependent steel curved dampers as fuse or interchangeable element in the beam-to-column connection region is one of the newest methods for improving the seismic performance of semi-rigid moment steel frames (SRMF). In the present study, performance of low-yield strength curved dampers in MRSF has been investigated. These dampers are inactive and install in the beam-to-column connection region. Variable parameters of this study involve the damper width (75, 100 and 125 mm), damper thickness (10, 15, 20, 25 and 30 mm) and the damper steel type (SN400YB and LY160). Evaluation of MRSF models were performed using finite element method by ABAQUS. For validation, a MRSF with curve dampers was modeled that had been experimentally tested and reported in previous experimental research and a good agreement was observed. The results show that the use of low-yield strength steel in curved steel dampers, depending on the damper thickness, can lead to an increase in the hysteresis equivalent damping ratio, ductility parameter and total energy dissipated compared to the steel with higher yield stress.
Mojtaba Gorji Azandariani,Majid Gholhaki,Mohammad Ali Kafi,Tadeh Zirakian,Afrasyab Khan,Hamid Abdolmaleki,Hamid Shojaeifar 국제구조공학회 2021 Steel and Composite Structures, An International J Vol.39 No.1
This research endeavor intends to use the implicit finite element method to investigate the structural response of steel shear walls with partial plate-column connection. To this end, comprehensive verification studies are initially performed by comparing the numerical predictions with several reported experimental results in order to demonstrate the reliability and accuracy of the implicit analysis method. Comparison is made between the hysteresis curves, failure modes, and base shear capacities predicted numerically using ABAQUS software and obtained/observed experimentally. Following the validation of the finite element analysis approach, the effects of partial plate-column connection on the strength and stiffness performances of steel shear wall systems with different web-plate slenderness and aspect ratios under monotonic loading are investigated through a parametric study. While removal of the connection between the web-plate and columns can be beneficial by decreasing the overall system demand on the vertical boundary members, based on the results and findings of this study such detachment can lower the stiffness and strength capacities of steel shear walls by about 25%, on average.
Steel dual-ring dampers: Micro-finite element modelling and validation of cyclic behavior
Mahdi Usefvand,Ali Mohammad Rousta,Mojtaba Gorji Azandariani,Hamid Abdolmaleki 국제구조공학회 2021 Smart Structures and Systems, An International Jou Vol.28 No.4
Extensive studies have been performed by researchers to increase the ductility and energy-absorption of concentrically braced frames. One of the most widely used strategies for increasing ductility and energy-absorbing is the utilization of energy-dissipation systems. In this regard, the energy-dissipation system consisting of a steel dual-ring damper (SDRD) with different construction details is presented, to improve hysteresis behavior and performance of steel ring dampers (SRD). The most important cause of energy-dissipation in SRDs are the development of bending plastic hinges in the rings. Therefore, by adding an inner ring to the SDR system, it increases the number of moment plastic hinges and in turn increases energy dissipation. Parametric studies havse been performed applying the nonlinear micro-finite element (MFE) procedure to investigate the improved models. The parametric studies comprise examining the efficacy of thickness parameters and the inner ring diameters of the improved models. The SRD models was selected as the base model for comparing and evaluating the effects of improved dampers. MFE models were then analyzed under cyclic loading and nonlinear static methods. Confirmation of the results of the MFE models were performed against the test results. The results indicated that the diameter to the thickness ratio of inner ring of SDRDs has a considerable influence on determining the hysteresis behavior, ductility, ultimate capacity and performance, as well as energy dissipation. Also, the results show that the details of the construction of the internal and external ring connections were a considerable effect on the performance and hysteresis behavior of SDRDs.
Submental intubation in maxillofacial fracture: a case report
Akbari, Hooshang,Heidari-Gorji, Mohammad Ali,Poormousa, Rostam,Ayyasi, Mitra The Korean Association of Oral and Maxillofacial S 2016 대한구강악안면외과학회지 Vol.42 No.3
It can be challenging to create a safe airway in maxilla facial fracture and some skull surgeries. In this case study, the patient experienced jaw fractures that disturbed the dental occlusion and associated fracture of the base of the skull. Neither nasal nor oral intubation was possible based on the side effects of tracheotomy; therefore, submental intubation was applied successfully. The procedure and results are presented in the text.
Bijan Rezaei,Siavash Riahi,Ali Ebrahimpoor Gorji 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.1
The growing threat of global warming has raised more attention towards carbon capture. Current amine plants used for carbon removal suffer from great costs inflicted by high energy demand of the solvent regeneration step. Recently, looking for amines with proper performance in reduced temperatures has been the subject of many researches. Clearly, conducting these researches without any criterion and based only on trial and error wastes large amounts of money and time; thus, it is highly needed that the effect of different amine structural parameters be studied on the amine’s cyclic capacity. Quantitative structure property relationship (QSPR) provides an effective method for predicting amines capacity for CO2 absorption. In this work, density functional theory (DFT) was employed for optimization of the molecular geometries, and linear and nonlinear models based on parameters related to the molecular structure are presented. The value of the square of the correlation coefficient (R2) for the MLR and SVM models are 0.894 and 0.973, respectively. Developed models can be used as a criterion for amine selection. Reliability and high predictability of the models are confirmed based on statistical tests. Moreover, mechanistic interpretation of models for better understanding of the reaction mechanism of carbon capture was discussed.