Scientia Iranica最新文献_第8页

Effects of the microchannel shape upon droplet formations during synthesis of nanoparticles 纳米颗粒合成过程中微通道形状对液滴形成的影响

IF 1.4 4区工程技术

Scientia Iranica Pub Date : 2023-07-08 DOI: 10.24200/sci.2023.60984.7089

F. Raji, M. Kazemeini

{"title":"Effects of the microchannel shape upon droplet formations during synthesis of nanoparticles","authors":"F. Raji, M. Kazemeini","doi":"10.24200/sci.2023.60984.7089","DOIUrl":"https://doi.org/10.24200/sci.2023.60984.7089","url":null,"abstract":"Advances in nanotechnology have made it possible to produce minimal tools and equipment that can be used to control tiny volumes of fluids. Currently, at the center of attention of scientists in various fields, such systems are referred to as microfluidic systems. Also, the ability to synthesize nanoparticles with precise control over the particle's form and size is crucial. The primary goal of this research was to see if the nozzle-focused microchannels could have been used to synthesize the Polycaprolactone (PCL) polymer nanoparticles through the COMSOL Multiphysics 5.4 software medium. In this study, the velocity and static pressure of the droplet after leaving the nozzle and entering the main channel, as well as the size, shape, distribution, and weight of the droplet in terms of the time step, were understudied. It was revealed that the channel's design allowed the droplets to keep their steady structure at its conclusion. Finally, it was shown that the droplet possessed a dual functionality of place and time in terms of size and weight distribution after a time step of 0.00305 seconds. The maximum drop saturation mass was formed, and the droplet diameter size displayed a plateau after 0.01 seconds.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84622603","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: 3

Entropy generation analysis for chemically reactive flow of Sutterby nanofluid considering radiation aspects 考虑辐射因素的萨特比纳米流体化学反应流的熵产分析

IF 1.4 4区工程技术

Scientia Iranica Pub Date : 2023-07-08 DOI: 10.24200/sci.2023.60105.6594

W. Khan, N. Anjum, A. Hobiny, Mehboob Ali

{"title":"Entropy generation analysis for chemically reactive flow of Sutterby nanofluid considering radiation aspects","authors":"W. Khan, N. Anjum, A. Hobiny, Mehboob Ali","doi":"10.24200/sci.2023.60105.6594","DOIUrl":"https://doi.org/10.24200/sci.2023.60105.6594","url":null,"abstract":": Nanofluids show greater heat transfer rate and characteristics of mechanical friction diminution using nano-sized hard elements to fluid. Moreover, regarding the working of heat transfer fluid, nanofluid is widely used in areas of refrigeration, shipping, automobile, chemical industry, energy, electronics, air conditioning, computer, and many other areas to cope heat transference issues. The aforesaid utilizations motivated us to encounter entropy generation aspects for Sutterby nanofluid flow configured by permeable surface. Moreover, well-known Buongiorno's model capturing same attributes of Brownian and thermophoretic-diffusions is presented for modeling and investigation. Additionally, (MHD) as well as thermal radiation effects are the part of current work. Here, we have also considered the viscous dissipation aspects. Similarity variable are used to decrease set of nonlinear PDEs into set of ODEs then resolved numerically by using bvp4c algorithm, besides the pertinent parameters are addressed graphically. The physical aspect of fluid flow, temperature, concentration for variation of involved parameters is explained with the help of graphs.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81297322","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: 1

A robust-fuzzy-probabilistic optimization model for the multi-objective problem of a sustainable green integrated production system under uncertainty 不确定条件下可持续绿色集成生产系统多目标问题的鲁棒模糊概率优化模型

IF 1.4 4区工程技术

Scientia Iranica Pub Date : 2023-07-08 DOI: 10.24200/sci.2023.59428.6239

Saeed Shahdoust, M. Fallah, S. E. Najafi

{"title":"A robust-fuzzy-probabilistic optimization model for the multi-objective problem of a sustainable green integrated production system under uncertainty","authors":"Saeed Shahdoust, M. Fallah, S. E. Najafi","doi":"10.24200/sci.2023.59428.6239","DOIUrl":"https://doi.org/10.24200/sci.2023.59428.6239","url":null,"abstract":"The design of a problem involving a sustainable integrated production system under uncertainty are covered in this article. The presented model aims to create an integrated production system that will lower costs across the board and greenhouse gas emissions. The robust-fuzzy-probabilistic (RFP) optimization method is used to control the non-deterministic parameters of the problem. The model's exact solution yielded calculation results that demonstrate that as greenhouse gas emissions have decreased, the production system's costs have increased as a result of changes in the number of machines and their technological capabilities. The outcome also demonstrates that as the uncertainty rate rises, the production system's level of demand also rises, which results in a rise in production. Costs and greenhouse gas emissions rise as a result of this increase in production. Additionally, the findings demonstrate that raising the average recycling rate improves the production system's stability. Because this is an NP-hard issue, many different optimization strategies have been tried, including the multi objective grey wolf optimizer (MOGWO) and the Non-dominated Sorting Genetic II (NSGA II). looking at the numerical examples of various sizes reveals that these algorithms have near-optimal solutions much more quickly and with much higher efficiency than the exact method.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73422872","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

Investigation on Flow Characteristics of Generic Car Body with Different Boundary Conditions 不同边界条件下通用车身流动特性研究

IF 1.4 4区工程技术

Scientia Iranica Pub Date : 2023-07-08 DOI: 10.24200/sci.2023.59961.6523

S. Keiyinci, O. Baş, Mustafa Atakan Akar

{"title":"Investigation on Flow Characteristics of Generic Car Body with Different Boundary Conditions","authors":"S. Keiyinci, O. Baş, Mustafa Atakan Akar","doi":"10.24200/sci.2023.59961.6523","DOIUrl":"https://doi.org/10.24200/sci.2023.59961.6523","url":null,"abstract":"In automotive aerodynamics, it is not common to focus on a specific vehicle due to restricted access to the CAD geometries, their short life span, and limited validation data. For this reason, researchers prefer generic bodies that look like automobiles such as Ahmed Body in their investigations. However, the absence of moving ground and rotating wheels makes these generic bodies unrealistic for aerodynamic studies. In this context, including wheels in CFD simulations, varying ground, and wheel boundary conditions, and comparing their qualitative and quantitative flow parameters with the original Ahmed Body experiment is the main objective of this paper. Results have shown that changing stationary ground and wheel boundaries into moving and rotating boundaries do have minor effects on wake characteristics and drag coefficients. However, just the presence of wheels on the model increases force coefficients significantly (increment in drag and lift coefficients by 27.32% and 188.5 counts, respectively.) even though these boundaries are stationary. As a result, the absence of moving ground and rotating wheels can be tolerated to some extent (especially for experimental studies in which inclusion of moving and rotating boundaries may have difficulties). However, a study cannot be evaluated exactly with a model without wheels.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-07-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74631247","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

Fabrication of a Solution-Processed IGZO/NiO P-N Diode 溶液处理IGZO/NiO P-N二极管的制备

IF 1.4 4区工程技术

Scientia Iranica Pub Date : 2023-06-28 DOI: 10.24200/sci.2023.57301.5166

N. Arjmandi, Mohamad Seraj

引用次数: 0

Adaptive Inverse Deep Reinforcement Lyapunov learning control for a floating wind turbine 浮式风力发电机的自适应逆深度强化Lyapunov学习控制

IF 1.4 4区工程技术

Scientia Iranica Pub Date : 2023-06-28 DOI: 10.24200/sci.2023.61871.7532

Hadi Mohammadian KhalafAnsar, J. Keighobadi

{"title":"Adaptive Inverse Deep Reinforcement Lyapunov learning control for a floating wind turbine","authors":"Hadi Mohammadian KhalafAnsar, J. Keighobadi","doi":"10.24200/sci.2023.61871.7532","DOIUrl":"https://doi.org/10.24200/sci.2023.61871.7532","url":null,"abstract":"Offshore floating wind turbines (FWT) decrease climate change adversial effects without occupying significant land and harvesting fields. Owing to the earth planet unexpected climate, online adaptive feedback control of FWTs will be effective in the sense of optimal and uniform energy capture. In this paper, a deep reinforcement learning (DRL)-based control system is proposed to offset both the disturbance and noise effects. Large variations of wind and water waves generate enormous information give rise to convergent learning of deep neural networks model of the wind turbine. As a result of the disturbance and wind sudden variations, an adaptive inverse control equipped with DRL could easily cope with the inherent drawback of DRL i.e., tracking error. Furthermore, received rewards in the DRL algorithm are passed through the newly designed training algorithm to predict control actions such that the loss function is decreased. The attenuation of disturbance and noise on the tracking performance of closed-loop FWT is clarified through software implementation tests while the weight’s convergency and update rules are proved by the direct Lyapunov theorem.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2023-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77152144","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: 1

An Optimal Scenario-Based Scheduling Method for an SOP-included Active Distribution Network Considering Uncertainty of Load and Renewable Generations 考虑负荷和可再生发电不确定性的有源配电网场景调度方法

4区工程技术

Scientia Iranica Pub Date : 2023-06-28 DOI: 10.24200/sci.2023.60823.7005

Pezhman Khalouie, Payam Alemi, Mojtaba Beiraghi

{"title":"An Optimal Scenario-Based Scheduling Method for an SOP-included Active Distribution Network Considering Uncertainty of Load and Renewable Generations","authors":"Pezhman Khalouie, Payam Alemi, Mojtaba Beiraghi","doi":"10.24200/sci.2023.60823.7005","DOIUrl":"https://doi.org/10.24200/sci.2023.60823.7005","url":null,"abstract":"The high penetration of renewable Distributed Generators (DGs) in the Active Distribution Network (ADN) in addition to its advantages brings great challenges for the ADN, due to their intermittent and uncertain generations. Increasing network flexibility using Soft Open Points (SOPs) is an effective solution to overcome these challenges. However, an SOP-based ADN may contain various renewable or Controllable DGs (CDGs), and autonomous interconnected Microgrids (MGs). Accordingly, the uncertainty of load and renewable generation makes its scheduling more complex. In this paper, a novel optimal scenario-based framework is proposed to schedule an SOP-included ADN with multi-interconnected microgrids, based on the forecasted scenarios of demand and renewable DGs generation. In the proposed framework, all technical constraints, such as AC load flow equations, SOP's operational limitations, and DG's production range, are modeled in a Second-Order Cone (SOC) programming format. The energy transaction between the ADN and the other agents, i.e., MGs, and Upstream Network (UN) is also considered. This model can be optimally solved in an acceptable time. To show the effectiveness of the proposed method, it is implemented on the IEEE 33-bus distribution network. The simulation results confirm its high accuracy and speed.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135354069","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 electroosmotic flow in a rectangular microchannel with use of magnetic and electric fields 利用磁场和电场对矩形微通道内电渗透流动进行数值模拟

IF 1.4 4区工程技术

Scientia Iranica Pub Date : 2023-06-26 DOI: 10.24200/sci.2023.58474.5742

M. Saghafian, Hossein Seyedzadeh, Abolfazl Moradmand

引用次数: 0

CFD Analysis of Liquid-Cooled Heatsink Using Nanofluids in Computer Processors 计算机处理器中使用纳米流体的液冷散热器的CFD分析

IF 1.4 4区工程技术

Scientia Iranica Pub Date : 2023-06-26 DOI: 10.24200/sci.2023.60327.6739

Gulnaz Topcu, U. Ercetin, Cisil Timuralp

引用次数: 0

Comprehensive Stochastic Analysis Method for Tree-Type PDNs and Ground Pollution on Mixed-Signal PCBs 树型多氯联苯与混合信号多氯联苯地面污染的综合随机分析方法

IF 1.4 4区工程技术

Scientia Iranica Pub Date : 2023-06-26 DOI: 10.24200/sci.2023.57864.5448

M. Mehri

引用次数: 0