Scientia Iranica最新文献_第6页

Using Neural Network for Predicting Hourly Origin-Destination Matrices from Trip Data and Environmental Information 利用神经网络从行程数据和环境信息中预测每小时出发地-目的地矩阵

IF 1.4 4区工程技术

Scientia Iranica Pub Date : 2023-07-18 DOI: 10.24200/sci.2023.58193.5608

Ehsan Hassanzadeh, Zahra Amini

引用次数: 0

Angle-monotonicity of theta-graphs for points in convex position 凸位置点的θ图的角度单调性

IF 1.4 4区工程技术

Scientia Iranica Pub Date : 2023-07-18 DOI: 10.24200/sci.2023.61034.7110

D. Bakhshesh, M. Farshi

引用次数: 0

Free Vibrations Analysis of Stepped Nanobeams Using Nonlocal Elasticity Theory 利用非局部弹性理论分析阶梯纳米梁的自由振动

IF 1.4 4区工程技术

Scientia Iranica Pub Date : 2023-07-18 DOI: 10.24200/sci.2023.61602.7395

M. Nalbant, S. Bağdatlı, A. Teki̇n

{"title":"Free Vibrations Analysis of Stepped Nanobeams Using Nonlocal Elasticity Theory","authors":"M. Nalbant, S. Bağdatlı, A. Teki̇n","doi":"10.24200/sci.2023.61602.7395","DOIUrl":"https://doi.org/10.24200/sci.2023.61602.7395","url":null,"abstract":". Free vibration of stepped nanobeams was investigated using Eringen's nonlocal elasticity theory. Beam analysis is based on Bernoulli-Euler theory and nanoscale analysis is based on Eringen's nonlocal elasticity theory. The system boundary conditions were determined as simple-simple. The equations of motion of the system were obtained using Hamilton's principle. For the solution of the obtained state equations, a multi-time scale, which is one of the perturbation methods, was used. The results part of the study, it is aimed to observe the nano-size effect and the effects of the step state. For this purpose, the natural frequency values of the first three modes of the system were obtained for different non-local parameter values, step rates, and step positions. When the results were examined, it was determined that the non-local parameter value, step ratio, and natural frequency were inversely proportional to each other. In addition, to strengthen the accuracy of the results, the results obtained were compared with the results of other studies in the literature conducted under the specified conditions, and a perfect agreement was observed. The current beam model, on the other hand, could help design and manufacture ICs such as nano-sensors and nano-actuators.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":"48 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139358193","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

Statistical Analysis Based Load Frequency Control of multi-area system with Nonlinearities using 2-DOF-PID controller with Application of Improved Sine-Cosine Algorithm optimizer 基于统计分析的非线性多区域系统负载频率控制，使用 2-DOF-PID 控制器，并应用改进的正弦余弦算法优化器

IF 1.4 4区工程技术

Scientia Iranica Pub Date : 2023-07-18 DOI: 10.24200/sci.2023.60059.6574

N. Gupta, M. M. Kar, Arun Kumar Singh

{"title":"Statistical Analysis Based Load Frequency Control of multi-area system with Nonlinearities using 2-DOF-PID controller with Application of Improved Sine-Cosine Algorithm optimizer","authors":"N. Gupta, M. M. Kar, Arun Kumar Singh","doi":"10.24200/sci.2023.60059.6574","DOIUrl":"https://doi.org/10.24200/sci.2023.60059.6574","url":null,"abstract":"In this article, for load frequency control(LFC) in power system an improved sine-cosine algorithm is proposed with 2-DOF-PID controller. To facilitate the inspection, a multi-area test system(three area) has been developed. Additionally, several physical restrictions have been taken into account while investigating practical power system analysis. For every scenario considered for the experiment, the suggested approach has been employed as the optimizer of parameter of the controller of LFC. 2-DOF-PID controllers has the ability to quickly reject disturbances without noticeably increasing overshoot in set point tracking, have been utilised as the controller of LFC. The PIDF and FOPID controllers has been compare with 2-DOF-PID controller to evaluate the usefulness of it. The simulation results of SCA, SSA, ALO, and PSO are some of the algorithm with which of the proposed modified algorithm were compared, in three distinct scenarios: disturbance in three areas, disturbance in two areas, and the final scenario with physical restrictions. Wilcoxon Sign Rank Test (WSRT) has been use for the statistical analysis and 20 separate times was carried out in order to further prove the supremacy of the suggested strategy.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":"40 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139357879","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

In-hospital mortality prediction model of heart failure patients using imbalanced registry data: A machine learning approach 使用不平衡登记数据的心衰患者院内死亡率预测模型：机器学习方法

IF 1.4 4区工程技术

Scientia Iranica Pub Date : 2023-07-18 DOI: 10.24200/sci.2023.61637.7412

H. Sabahi, M. Vali, D. Shafie

引用次数: 0

Sustainable pomegranate supply chain network design considering cultivation process and water consumption 考虑栽培过程和耗水量的可持续石榴供应链网络设计

IF 1.4 4区工程技术

Scientia Iranica Pub Date : 2023-07-18 DOI: 10.24200/sci.2023.60251.6688

Mohammad Pourmehdi, Seyed Hossein Hosseinian-Kashani, M. Paydar, A. Divsalar

{"title":"Sustainable pomegranate supply chain network design considering cultivation process and water consumption","authors":"Mohammad Pourmehdi, Seyed Hossein Hosseinian-Kashani, M. Paydar, A. Divsalar","doi":"10.24200/sci.2023.60251.6688","DOIUrl":"https://doi.org/10.24200/sci.2023.60251.6688","url":null,"abstract":"Agricultural activities have adverse effects on the environment by emitting greenhouse gases and consuming great deals of freshwater. In addition, fruits constitute a substantial part of agricultural products used for balancing diets. In particular, pomegranate is one of the most used products by people of different cultures. In this study, a multi-objective mathematical model was developed to balance sustainability dimensions by focusing on selecting the optimal cultivation process and determining the optimal material flows between pomegranate supply chain facilities. The proposed model maximizes the total profit and the number of created job opportunities due to cultivation process selection and the establishment of plants. It also addresses the environmental impacts by minimizing fertilizer, pesticide, and water consumption in pomegranate cultivation. The model also considers the reverse flow of pomegranate peel and seeds to recapture the value of these products, commonly known as waste. A real case in the Mazandaran province of Iran was considered for validating the developed model. Finally, comprehensive sensitivity analyses were performed on the influential factors of the problem, and managerial implications are presented.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":"73 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2023-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139358051","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

Computing the population mean on the use of auxiliary information under ranked set sampling 在排序集抽样下，利用辅助信息计算总体均值

IF 1.4 4区工程技术

Scientia Iranica Pub Date : 2023-07-08 DOI: 10.24200/sci.2023.57385.5213

G. Vishwakarma

引用次数: 0

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":"12 1","pages":""},"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

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":"113 1","pages":""},"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

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":"1 1","pages":""},"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