Scientia Iranica最新文献_第6页

Analysis of Natural Convective Flow of Casson Fluid around an Inclined Rectangular Cylinder 卡森流体绕斜矩形圆柱自然对流流动分析

4区工程技术

Scientia Iranica Pub Date : 2023-08-30 DOI: 10.24200/sci.2023.60747.6968

Olalekan Adebayo Olayemi, Tomisin Favour Ajide, Adebowale Martins Obalalu, Muneer A. Ismael

{"title":"Analysis of Natural Convective Flow of Casson Fluid around an Inclined Rectangular Cylinder","authors":"Olalekan Adebayo Olayemi, Tomisin Favour Ajide, Adebowale Martins Obalalu, Muneer A. Ismael","doi":"10.24200/sci.2023.60747.6968","DOIUrl":"https://doi.org/10.24200/sci.2023.60747.6968","url":null,"abstract":"This paper presents the natural convection around a tilted hot cylinder immersed in Casson fluid and enclosed by a square container. The parameters of Casson fluid are set to be (0.1≤η ≤ 1.0), aspect ratio (0.1≤AR ≤ 0.7), tilt angle (0^°≤γ ≤ 90^° ) and Rayleigh number (10^3≤Ra ≤ 10^6) are inspected to reveal their influences on Casson fluid flow and heat transfer. The governing equations were solved with COMSOL Multiphysics 5.6 software. The walls of the enclosure and the cylinder are fixed as T_c and T_h. Findings are delineated as stream functions, isothermal contours, and average Nusselt numbers. The study reveals that for the range of η, AR and Ra investigated, the rate of heat transfer of the enclosure wall increases with increasing η, AR and Ra; while for the heated rectangular obstacle, the rate of heat transfer decreases with AR growth but improves with increasing η and Ra. At Ra=106, γ increment results in heat transfer enhancement for the enclosure and cylinder walls. For Ra in the interval of 10^3≤Ra ≤ 10^5, the response of the thermal profiles of both the rectangular cylinder and enclosure walls to cylinder orientation depends on the value of Ra and γ considered.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136241017","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analyzing the Impacts of Gasoline Price Change on Nationwide Trip Demand and Drivers’ Behavior Using Regression Discontinuity Design 用回归不连续设计分析汽油价格变动对全国出行需求和驾驶员行为的影响

4区工程技术

Scientia Iranica Pub Date : 2023-08-30 DOI: 10.24200/sci.2023.58931.5973

Sepehr Saeidi, Zahra Amini

{"title":"Analyzing the Impacts of Gasoline Price Change on Nationwide Trip Demand and Drivers’ Behavior Using Regression Discontinuity Design","authors":"Sepehr Saeidi, Zahra Amini","doi":"10.24200/sci.2023.58931.5973","DOIUrl":"https://doi.org/10.24200/sci.2023.58931.5973","url":null,"abstract":"Gasoline is one of the essential commodities in today's societies and its price can affect different aspects of citizens' lives. This article studies the impacts of the sudden increase in gasoline price on the volume of intercity traffic at national and provincial scales, along with the changes in driving speed distribution and the percentage of speeding violations. The studied period includes four months in two consecutive years. Data was collected from more than 2400 loop detectors placed on the roads of 31 provinces of Iran. This data is used for implementing Regression Discontinuity Design (RDD) on traffic volume and speeding violation percentage. Statistical measures of speed distribution are also used to examine changes in driving speed. According to the literature, the optimal driving speed for fuel consumption is about 50 to 70 km/h. This study showed a 7.4% increase in the probability of driving in the 50 to 70 km/h range after the price increase. Also, according to research results, the volume of intercity traffic and the percentage of speeding violations has decreased due to the rise in gasoline price.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136240875","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical simulation of laminar flow and free convection heat transfer from an isothermal vertical flat plate 等温垂直平板层流和自由对流换热的数值模拟

4区工程技术

Scientia Iranica Pub Date : 2023-08-30 DOI: 10.24200/sci.2023.61098.7139

Ali Belhocine, N. Stojanovic, O. I. Abdullah

{"title":"Numerical simulation of laminar flow and free convection heat transfer from an isothermal vertical flat plate","authors":"Ali Belhocine, N. Stojanovic, O. I. Abdullah","doi":"10.24200/sci.2023.61098.7139","DOIUrl":"https://doi.org/10.24200/sci.2023.61098.7139","url":null,"abstract":"In this modest work, we present a numerical study of the phenomenon of laminar natural convection in a vertical plate, whose wall was maintained at a constant temperature.It was assumed that the boundary layer problem was initially given in a two-dimensional flow even though the physical properties of the fluid were considered to be constant except for the density change with the temperature.The governing equations of the model have been transformed and simplified into a non-linear system of ordinary differential equations (ODE) through the use of similarity variables which we were able to solve numerically using the Runge-Kutta method. This method has better opted for the numerical resolution of this system which was developed in FORTRAN code on the computer. The numerical results of the model were presented in tabular form and the velocity and temperature profiles for various Prandtl numbers were analyzed and depicted graphically. Also, the expressions of the mean heat transfer rate and the average Nusselt number for the whole plate were obtained in the analysis. The results were compared at the end with the numerical results obtained in the literature, showing that they were in good agreement.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136240873","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A novel BIM strategic plan development method for the water industry of Iran 一种新的伊朗水务行业BIM战略规划开发方法

4区工程技术

Scientia Iranica Pub Date : 2023-08-30 DOI: 10.24200/sci.2023.60629.6903

Amin Alvanchi, Mohammad Amin Jafari, Nasim Didehvar

{"title":"A novel BIM strategic plan development method for the water industry of Iran","authors":"Amin Alvanchi, Mohammad Amin Jafari, Nasim Didehvar","doi":"10.24200/sci.2023.60629.6903","DOIUrl":"https://doi.org/10.24200/sci.2023.60629.6903","url":null,"abstract":"Cost overrun and time delays in water industry construction projects persuade the authorities to improve the project management approach by adopting building information modeling (BIM). However, BIM is new in the water industry and, with the many aspects and extensive details involved, its successful implementation requires an effective strategic plan. To address this need, in this project a customized BIM strategic plan development method is proposed and followed for the water industry projects in Iran. As a result, two 5-year implementation phases are proposed and specifications of the required infrastructures are outlined. The first phase targets the implementation of BIM maturity level one in pilot projects and BIM maturity level two becomes mandatory at the end of phase two. To the best of the authors' knowledge, for the first time, a systematic method for the BIM strategic plan development in an industry, with multiple organizations involved, is proposed in this research. The two types of BIM committees introduced and utilized in this research can inspire other BIM strategic plan development efforts for large industries, e.g. transportation industry, the electric power industry, and the oil and gas industry, with multiple organizations in charge and different types of construction projects implemented.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136241015","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Short Term Forecasting of Power Quality Distortions in Electrical Energy Systems with LSTM and GRU Networks 基于LSTM和GRU网络的电能系统电能质量畸变短期预测

4区工程技术

Scientia Iranica Pub Date : 2023-08-23 DOI: 10.24200/sci.2023.61430.7300

Ismail Bozdag, Serhat Berat Efe, Ilyas Ozer

{"title":"Short Term Forecasting of Power Quality Distortions in Electrical Energy Systems with LSTM and GRU Networks","authors":"Ismail Bozdag, Serhat Berat Efe, Ilyas Ozer","doi":"10.24200/sci.2023.61430.7300","DOIUrl":"https://doi.org/10.24200/sci.2023.61430.7300","url":null,"abstract":"Technological development has led to a diversification of loads in transmission and distribution systems. The rise of non-linear loads in the system is one of the biggest effects of this variation as semiconductor technology develops. Nonlinear loads are characterized by current and voltage characteristics that are not purely sinusoidal, also known as harmonics. Harmonics cause the system insulation to degrade and increase energy loss. Therefore, it's crucial to get rid of harmonics before they occur. This study intends to lower the risk of distribution system damage by employing complex harmonic forecasting methods. An RNN-based forecasting algorithm has been created by using actual system power quality data obtained from the Organized Industrial Zone in Bandırma, Turkey. Parameters that are most likely to be neglected in simulation studies are also taken into account in the calculation by using actual data. Active power data, current harmonic data and calendar data were used together to design harmonic forecasting model. Graphs and calculations were used to discuss the results. The obtained minimum values of the RMSE, MAE, and MAPE are 2,116, 0,666 and 11,619, respectively. The convergence as a result of these calculations has allowed high forecasting performance of power quality distortions.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135621545","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optimized Deep Networks Structure to Improve the Accuracy of estimator algorithm in Deep Networks learning 优化深度网络结构以提高深度网络学习中估计器算法的准确性

4区工程技术

Scientia Iranica Pub Date : 2023-08-23 DOI: 10.24200/sci.2023.62337.7782

Hamideh Rezaei Nezhad, Farshid Keynia, Amir Sabagh Molahosseini

引用次数: 0

A Novel Memristive Chaotic System with Hidden Attractors and a Line of Equilibria 一种具有隐吸引子和平衡线的记忆混沌系统

4区工程技术

Scientia Iranica Pub Date : 2023-08-16 DOI: 10.24200/sci.2023.61440.7307

Zhen Wang, Sridevi Sriram, Huaigu Tian, Karthikeyan Rajagopal

引用次数: 0

Reduced-Order Approximation of Bilinear Systems Using a New Hybrid Method based on Balanced Truncation and Iterative Rational Krylov Algorithms 基于平衡截断和迭代有理Krylov算法的双线性系统降阶逼近新方法

4区工程技术

Scientia Iranica Pub Date : 2023-08-16 DOI: 10.24200/sci.2023.61596.7394

H. Nasiri Soloklo, N. Bigdeli

{"title":"Reduced-Order Approximation of Bilinear Systems Using a New Hybrid Method based on Balanced Truncation and Iterative Rational Krylov Algorithms","authors":"H. Nasiri Soloklo, N. Bigdeli","doi":"10.24200/sci.2023.61596.7394","DOIUrl":"https://doi.org/10.24200/sci.2023.61596.7394","url":null,"abstract":"This paper proposes a hybrid method for order reduction of the bilinear system model using Balanced Truncation (BT) and Bilinear Iterative Rational Krylov Algorithm (BIRKA). Bilinear BT (BBT) has low accuracy but guarantees stability, while BIRKA convergence suffers from sensitivity to initial choice of reduced-order system. The proposed method first determines the order of the reduced bilinear model by minimizing the index of Integral Square Error (ISE). Then, the initial guess of reduced-order system is provided via two approaches, BBT and Linear BT (LBT), to guarantee the convergence of BIRKA. The result of BBT is a good stable initial guess for BIRKA, but it is very computationally expensive to solve the generalized Lyapunov equations to find the solution. LBT decreases the computational complexity by providing the initial guess via solving the Lyapunov equations. To further decrease the complexity, the condition number is substituted in place of the eigenvalues in BIRKA. Three bilinear test systems are considered to show the efficiency of proposed method. Finally, the performance of the proposed method is compared with some classical methods. The results show that the convergence probability of BIRKA increases. Also, the time for the determining the model order reduction decreases.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135022828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Visual Creativity through Concept Combination Using Quantum Cognitive Models 基于量子认知模型的概念组合视觉创意

4区工程技术

Scientia Iranica Pub Date : 2023-08-16 DOI: 10.24200/sci.2023.61494.7340

Mozhdeh Ahrabi Tabriz, Tayebe Rafiei Atani, Mehrdad Ashtiani, Mohammad Reza Jahed-Motlagh

{"title":"Visual Creativity through Concept Combination Using Quantum Cognitive Models","authors":"Mozhdeh Ahrabi Tabriz, Tayebe Rafiei Atani, Mehrdad Ashtiani, Mohammad Reza Jahed-Motlagh","doi":"10.24200/sci.2023.61494.7340","DOIUrl":"https://doi.org/10.24200/sci.2023.61494.7340","url":null,"abstract":"Computational creativity modeling, including concept combination, enables us to foster deeper abilities of AI agents. Although concept combination has been addressed in a lot of computational creativity studies, findings show incompatibility amongst empirical data of concept combination and the results of the used methods. In addition, even though recent neuroscientific studies show the crucial impact of retrieving concepts’ relations explicitly stored in episodic memory, it has been underestimated in modeling creative processes. In this paper, a quantum cognition-based approach is used to more effectively consider the context and resolve logical inconsistencies. Also, episodic memory is leveraged as the basis for the concept combination modeling process based on the created context. The result of the proposed process is a set of meaningful concepts and expressions as a combination of stimuli and related episodes which are used to depict a visual collage as an image. The significant improvement in the quality of results in comparison with the existing methods suggests that quantum-like modeling can be considered as the foundation for developing AI agents capable of creating artistic images or assisting a person during a creative process.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135022829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical Simulation of Water Drop Deformation Under Electrical Fields in Oil Fields 油田电场作用下水滴变形的数值模拟

4区工程技术

Scientia Iranica Pub Date : 2023-08-16 DOI: 10.24200/sci.2023.60920.7057

M. Taghian, S. Yaghoubi

引用次数: 0