Scientia Iranica最新文献_第7页

Force Ripple Reduction Methods for Tubular Permanent Magnet Linear Machines 管状永磁直线电机的力脉动减小方法

4区工程技术

Scientia Iranica Pub Date : 2023-08-16 DOI: 10.24200/sci.2023.61143.7165

A. Ashouri-Zadeh, Z. Nasiri-Gheidari

{"title":"Force Ripple Reduction Methods for Tubular Permanent Magnet Linear Machines","authors":"A. Ashouri-Zadeh, Z. Nasiri-Gheidari","doi":"10.24200/sci.2023.61143.7165","DOIUrl":"https://doi.org/10.24200/sci.2023.61143.7165","url":null,"abstract":"This paper presents some novel force ripple reducing techniques for tubular permanentmagnetlinear machines (TPMLMs) with the square-shaped cross section. These methods are verystraightforward, so their implementation in TPMLMs with the square cross section is easy. Ananalytical form of machine parameters such as the thrust force is obtained by solving the analyticalfield. A modular configuration for permanent-magnet pole is used to reduce teeth coggingforce. Furthermore, the manufacturing cost of TPMLMs can be reduced by using modular polepermanent-magnet. In this method, the width of permanent-magnets (PMs) is calculated by usingFourier analysis and a sensitivity analysis has been conducted to identify the robustness of thistechnique. Additional stator side methods are used to decrease the end face cogging force. Moreover,the stator teeth shifting method is proposed to reduce the electromagnetic force ripples. Also,the produced electromagnetic force of the machine is increased by using a delay in the power supply.3 -D non-linear finite-element analyses and experimental tests are performed to investigatethe effectiveness and performance of proposed techniques.","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":"135022830","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

Introducing a new shimming method based on combination of axial and radial Halbach arrays to have a uniform flux density for a low-field portable MRI system 介绍了一种基于轴向和径向哈尔巴赫阵列组合的低场便携式磁共振成像系统均匀磁通密度的新方法

4区工程技术

Scientia Iranica Pub Date : 2023-08-08 DOI: 10.24200/sci.2023.58266.5647

M. Shiravi, B. Ganji

引用次数: 0

Doctor Code: A Machine Learning-Based Approach to Program Repair 医生代码:基于机器学习的程序修复方法

4区工程技术

Scientia Iranica Pub Date : 2023-08-08 DOI: 10.24200/sci.2023.54718.3884

Sharmin Moosavi, Mojtaba Vahidi-Asl, Hassan Haghighi, Mohammad Rezaalipour

{"title":"Doctor Code: A Machine Learning-Based Approach to Program Repair","authors":"Sharmin Moosavi, Mojtaba Vahidi-Asl, Hassan Haghighi, Mohammad Rezaalipour","doi":"10.24200/sci.2023.54718.3884","DOIUrl":"https://doi.org/10.24200/sci.2023.54718.3884","url":null,"abstract":"To address the problems of automatic repair techniques, we present Doctor Code, a new APR technique that chooses repair operators by systematically learning from the features of the most common bugs in different programs, using machine learning. The wise selection of repair operators reduces the number of candidate patches. We compare our technique against Mutation repair, a test suite-based APR technique, using the Siemens suite. The experiment results indicate that our technique can fix 41 bugs while the baseline only repairs 22. In addition, Doctor Code can produce patches that do not exist in the search space of the three test suite-based techniques called SPR, Prophet, and SemFix. We also experiment with Doctor Code utilizing three buggy versions of a program called Space (9K LOC), to indicate its capability of repairing large-sized programs. In addition, we compare Doctor Code against 7 state-of-the-art APR tools like Elixir, using the Defects4j dataset. The experiment results indicate that our technique outperforms the other tools regarding the number of fixed bugs and overfitted patches.Comparing Doctor Code with RAPR as the baseline indicates that using machine learning reduces the number of overfitted patches and the time of patch production by 33.33% and 82.68%, respectively.","PeriodicalId":21605,"journal":{"name":"Scientia Iranica","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135841568","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

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":null,"pages":null},"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":null,"pages":null},"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":null,"pages":null},"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