Ain Shams Engineering Journal最新文献_第2页

Exploring the structural features of Triangular fractal antenna for detection of brain tumor

IF 6 2区工程技术

Ain Shams Engineering Journal Pub Date : 2025-03-28 DOI: 10.1016/j.asej.2025.103369

P. Bini Palas, K. Rahimunnisa

{"title":"Exploring the structural features of Triangular fractal antenna for detection of brain tumor","authors":"P. Bini Palas, K. Rahimunnisa","doi":"10.1016/j.asej.2025.103369","DOIUrl":"10.1016/j.asej.2025.103369","url":null,"abstract":"<div><div>Fractal antennas are being more widely employed in medical imaging, notably microwave imaging for brain tumour detection. The characteristics they possess make them an excellent choice for identifying tumours of varying sizes and depths. This article introduces an innovative Sierpinski Trio fractal antenna (STFA) designed for the detection of brain tumours and showcases improved antenna performance metrics. The STFA has been designed using the CST simulation tool, achieving a maximum return loss of −77.38 dB, a gain of 14.13 dBi, and a directivity of 15.73 dB at a frequency of 4.72 GHz. In addition to the fractal antenna construction, the simulation tool is used to build the five-layered head phantom. Parametric research was conducted to optimise the embedded structure of the STFA and head phantom for diverse tumour sizes, and the antenna performances were examined. The STFA structure detects tumour sizes ranging from 5 to 20 mm and delivers return loss of −57.28 dB, −45.23 dB, −51.62 dB, and −47.59 dB. The suggested antenna has applications in the medical field, particularly in the detection of kidney stones, breast tumours, and tumour cells in the human brain.</div></div>","PeriodicalId":48648,"journal":{"name":"Ain Shams Engineering Journal","volume":"16 5","pages":"Article 103369"},"PeriodicalIF":6.0,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143725246","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Urban identity in Da Lat: An inquiry into how the city is perceived?

IF 6 2区工程技术

Ain Shams Engineering Journal Pub Date : 2025-03-28 DOI: 10.1016/j.asej.2025.103353

Duy Thinh Do , Thuy Dung Tran , Thi Thuy Trang Nguyen , Trong Tin Tran , Dinh Tan Vo , Xuan Son Do , Thanh Hai Truong

{"title":"Urban identity in Da Lat: An inquiry into how the city is perceived?","authors":"Duy Thinh Do , Thuy Dung Tran , Thi Thuy Trang Nguyen , Trong Tin Tran , Dinh Tan Vo , Xuan Son Do , Thanh Hai Truong","doi":"10.1016/j.asej.2025.103353","DOIUrl":"10.1016/j.asej.2025.103353","url":null,"abstract":"<div><div>The concept of urban identity remains a subject of debate among scholars and across various scientific disciplines. Researchers have explored urban identity through multiple approaches, including the visual perception theory of imageability, pattern language theory, and psychological theories. Meanwhile, social identity theory, self-categorization theory, and identity process theory have provided a foundation for constructing a comprehensive conceptual framework for urban identity. Unlike prior research, this study integrates urban identity, social identity theory, and identity process theory, bridging tangible and intangible aspects of urban space. It refines a conceptual framework of urban identity by identifying key contributing factors and assessing their impact based on residents’ perceptions. Additionally, it supports Da Lat’s urban identity preservation amid urbanization, aiding urban planning, management, and heritage conservation. This research is grounded in environment–behavior studies, providing a platform to explore urban identity in social, personal, and temporal dimensions based on urban dwellers’ perceptions. Using a mixed-methods approach, including Group Focused Discussions, In-depth Interviews, and Questionnaires, the study identifies six dimensions of urban identity, further categorized into 17 conceptual groups. Additionally, it defines 19 main categories comprising 93 specific elements, offering a scientific foundation for theoretical urban identity structures in Da Lat and guiding its urban planning and development.</div></div>","PeriodicalId":48648,"journal":{"name":"Ain Shams Engineering Journal","volume":"16 5","pages":"Article 103353"},"PeriodicalIF":6.0,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143715070","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Comprehensive TCAD simulation and optimization of lead-free AgBiI4 solar cells: Migration from single cell to high-performance indoor photovoltaic modules

IF 6 2区工程技术

Ain Shams Engineering Journal Pub Date : 2025-03-28 DOI: 10.1016/j.asej.2025.103371

Marwa S. Salem , Ahmed Shaker , Mostafa M. Salah , Mona El Sabbagh , Michael Gad

{"title":"Comprehensive TCAD simulation and optimization of lead-free AgBiI4 solar cells: Migration from single cell to high-performance indoor photovoltaic modules","authors":"Marwa S. Salem , Ahmed Shaker , Mostafa M. Salah , Mona El Sabbagh , Michael Gad","doi":"10.1016/j.asej.2025.103371","DOIUrl":"10.1016/j.asej.2025.103371","url":null,"abstract":"<div><div>The growing demand for sustainable power sources for IoT devices highlights the need for eco-friendly, efficient, and lead-free indoor photovoltaic (IPV) technologies, as current lead-based perovskites pose environmental and health risks. This study presents a comprehensive TCAD simulation of lead-free AgBiI<sub>4</sub> (ABI) perovskite-based photovoltaic cells and modules optimized for indoor energy harvesting. The simulation model was initially validated through calibration against an experimental AgBiI<sub>4</sub>-based solar cell, featuring the structure ITO/SnO<sub>2</sub>/AgBiI<sub>4</sub>/PTAA/Au. Loss analysis of the calibrated cell revealed that the cell suffers from different issues, including high defects and low absorption capabilities. To address these issues, we investigated some potential routes for performance enhancement through critical parameter optimizations such as absorber thickness, carrier lifetime, and band alignment. These improvements led to a significantly enhanced ABI-based cell design under white LED illumination. Furthermore, the study extended to the design of an ABI-based mini-module, analyzing the effects of gap width, geometric fill factor (GFF), and ITO sheet resistance on module efficiency. Module efficiencies of 5.15 % and 23.58 % under 2700 K LED illumination (1000 lx) were achieved for initial and optimized designs, respectively, with a total gap width of 0.9 mm in a four-cell series configuration. This research introduces a novel approach to optimizing ABI perovskite materials for IPVs, addressing the critical need for eco-friendly and lead-free alternatives to traditional lead-based perovskite technologies. By demonstrating significant improvements in efficiency and applicability, this study establishes ABI-based solar modules as promising candidates for powering indoor IoT devices.</div></div>","PeriodicalId":48648,"journal":{"name":"Ain Shams Engineering Journal","volume":"16 5","pages":"Article 103371"},"PeriodicalIF":6.0,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143725245","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Development of automatic rebar layout algorithms considering design characteristics of reinforced concrete members

IF 6 2区工程技术

Ain Shams Engineering Journal Pub Date : 2025-03-27 DOI: 10.1016/j.asej.2025.103367

Daniel Darma Widjaja , Lwun Poe Khant , Titi Sari Nurul Rachmawati , Sunkuk Kim

{"title":"Development of automatic rebar layout algorithms considering design characteristics of reinforced concrete members","authors":"Daniel Darma Widjaja , Lwun Poe Khant , Titi Sari Nurul Rachmawati , Sunkuk Kim","doi":"10.1016/j.asej.2025.103367","DOIUrl":"10.1016/j.asej.2025.103367","url":null,"abstract":"<div><div>Rebar layout is crucial for structural integrity, cost efficiency, and accurate estimation in construction. This paper presents advanced algorithms for optimizing rebar cutting lengths and automating structural drawings. Utilizing structural design outputs, the approach integrates special length rebar concepts and shape codes for precise bend deductions. Algorithms were developed to calculate rebar lengths for structural elements like columns and beams, addressing longitudinal continuous, discontinuous, and confinement rebars. This resulted in a 10.56% reduction in column rebar quantities and a 2.22% reduction for beams compared to the original design. Automated rebar layout algorithms also established equations for determining rebar coordinates and arrangements, facilitating efficient structural drawing generation. This reduces manual drafting, streamlines rebar workflows, and enhances project efficiency. The findings highlight the potential of computational techniques in rebar layout optimization, enabling cost-effective, sustainable construction practices while improving accuracy and efficiency.</div></div>","PeriodicalId":48648,"journal":{"name":"Ain Shams Engineering Journal","volume":"16 5","pages":"Article 103367"},"PeriodicalIF":6.0,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143705820","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A hybrid model for extractive summarization: Leveraging graph entropy to improve large language model performance

IF 6 2区工程技术

Ain Shams Engineering Journal Pub Date : 2025-03-27 DOI: 10.1016/j.asej.2025.103348

Taner UÇKAN

引用次数: 0

Design and implementation of a medium frequency direct current resistance spot welding system integrated with welding control interface

IF 6 2区工程技术

Ain Shams Engineering Journal Pub Date : 2025-03-26 DOI: 10.1016/j.asej.2025.103357

Can Özensoy , Murat Uyar

{"title":"Design and implementation of a medium frequency direct current resistance spot welding system integrated with welding control interface","authors":"Can Özensoy , Murat Uyar","doi":"10.1016/j.asej.2025.103357","DOIUrl":"10.1016/j.asej.2025.103357","url":null,"abstract":"<div><div>The increasing demand for high-precision welding requires advanced systems with real-time feedback control. Traditional resistance spot welding (RSW) technologies struggle with managing complex welding profiles and ensuring consistent weld quality. This study presents a medium-frequency direct current (MFDC)-RSW system integrated with a Python-based welding control interface (WCI) to enhance precision and adaptability. The system enables real-time parameter optimization and closed-loop current regulation using a LaunchXL-F28069M microcontroller. Experimental validation demonstrated high accuracy, achieving 97–98 % tracking accuracy in welding current and reducing RMSE from 0.178 kA to 0.109 kA. Closed-loop control outperformed open-loop configurations, enhancing process stability. The WCI facilitated efficient parameter adjustments and robust operation under varying conditions. By improving weld precision, process consistency, and adaptability, the proposed system overcomes limitations of traditional RSW, contributing to the advancement of adaptive welding technologies. Future research may explore enhanced feedback mechanisms and broader industrial applications.</div></div>","PeriodicalId":48648,"journal":{"name":"Ain Shams Engineering Journal","volume":"16 5","pages":"Article 103357"},"PeriodicalIF":6.0,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143697344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An optimized preprocessing Gauss-Seidel iterative detection algorithm for massive MIMO systems

IF 6 2区工程技术

Ain Shams Engineering Journal Pub Date : 2025-03-26 DOI: 10.1016/j.asej.2025.103358

Haitao Liu , Xuchao Cheng , Wenqing Li , Liguo Wang , Linglin Zhang

{"title":"An optimized preprocessing Gauss-Seidel iterative detection algorithm for massive MIMO systems","authors":"Haitao Liu , Xuchao Cheng , Wenqing Li , Liguo Wang , Linglin Zhang","doi":"10.1016/j.asej.2025.103358","DOIUrl":"10.1016/j.asej.2025.103358","url":null,"abstract":"<div><div>The mini-mum mean square error(MMSE) algorithm nearly achieves optimal performance in massive Multiple-Input Multiple-Output (MIMO) detection, but its direct application is limited by the computational burden of high-dimensional matrix inversions. we propose an Optimized Preprocessing Gauss-Seidel (OPGS) iterative detection algorithm in this paper. The OPGS algorithm transforms the MMSE filter matrix into a linear equation, reducing complexity and eliminating the need for direct inversion. Additionally, by introducing a banded matrix to optimize the filter vector, we derived a novel iterative method that significantly improves both performance and convergence speed. We tested the proposed algorithm under various conditions, and simulations show that it requires fewer iterations to achieve detection performance similar to the MMSE algorithm under the same conditions. Specifically, in system with <span><math><mrow><mn>256</mn><mo>×</mo><mn>32</mn></mrow></math></span>, after two iterations, the performance between our algorithm and the MMSE method is only 0.04 dB. Notably, this result was accomplished with a minimal iteration.</div></div>","PeriodicalId":48648,"journal":{"name":"Ain Shams Engineering Journal","volume":"16 5","pages":"Article 103358"},"PeriodicalIF":6.0,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143697345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Utilizing neutral GRC modeling based on resistive network for detecting geo-electrical structures and analyzing its impact on HVDC power grids

IF 6 2区工程技术

Ain Shams Engineering Journal Pub Date : 2025-03-25 DOI: 10.1016/j.asej.2025.103375

Lijun Duan , Binghua Shi , Qiankun Zuo , Ruiheng Li , Hao Tian , Chao Wang , Haiyang Wang

{"title":"Utilizing neutral GRC modeling based on resistive network for detecting geo-electrical structures and analyzing its impact on HVDC power grids","authors":"Lijun Duan , Binghua Shi , Qiankun Zuo , Ruiheng Li , Hao Tian , Chao Wang , Haiyang Wang","doi":"10.1016/j.asej.2025.103375","DOIUrl":"10.1016/j.asej.2025.103375","url":null,"abstract":"<div><div>Ground return currents (GRCs) induced by monopole power grids provide insights into subsurface geoelectrical structures. However, accurately modeling GRCs is challenging due to ultralong-distance power lines with resistivity contrasts between conductors and the ground. To address this, we propose a novel calculation method using a node voltage (NV) resistance network (RN) approach, leveraging an expandable octree grid inspired by Kirchhoff’s RN (KRN). The NV method ensures conservation of current and voltage equations, preserving complete geoelectric information. By integrating a symmetric system and adaptive octree grid, the method achieves higher accuracy and computational efficiency. Numerical examples show accuracy improvement from 1 % to 0.1 %, a reduction of computation time by 80 %, and 78 % fewer elements. Validation through a bedrock investigation demonstrates inversion results consistent with independent surveys, confirming the method’s applicability.</div></div>","PeriodicalId":48648,"journal":{"name":"Ain Shams Engineering Journal","volume":"16 5","pages":"Article 103375"},"PeriodicalIF":6.0,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143697346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Proposed Arabic word lists for subjective speech intelligibility tests via a communication system

IF 6 2区工程技术

Ain Shams Engineering Journal Pub Date : 2025-03-25 DOI: 10.1016/j.asej.2025.103312

Ahmed Elkhateeb , Majed Attia , Soha Eldakdoky , Mostafa Sabbagh , Abdulrahman L. Balkhoyor , Nawaf Alharthi , Mohamed M. Labib

{"title":"Proposed Arabic word lists for subjective speech intelligibility tests via a communication system","authors":"Ahmed Elkhateeb , Majed Attia , Soha Eldakdoky , Mostafa Sabbagh , Abdulrahman L. Balkhoyor , Nawaf Alharthi , Mohamed M. Labib","doi":"10.1016/j.asej.2025.103312","DOIUrl":"10.1016/j.asej.2025.103312","url":null,"abstract":"<div><div>This study addresses the critical gap in speech intelligibility testing for Arabic-speaking regions by introducing the first standardized, phonetically balanced Arabic word lists, aligned with ANSI S3.2. We curated 20-word lists, totalling 1,000 words, selected for their phonetic representation and frequency in the Modern Standard Arabic. These words were refined from an initial pool of 1,200 words through systematic evaluations of difficulty and familiarity. A key innovation here is the development of the Word Selector Application (WSA), a Python-based tool that facilitates randomized word selection, ensuring diversity and phonetic balance. The WSA significantly contributes to standardizing speech intelligibility tests in Arabic, enhancing the accuracy and reliability of assessments in many acoustic disciplines. Not only does this work pave the way for inclusion in international standards but it also underscores the need for comprehensive Arabic standards in subjective speech intelligibility testing, marking foundational steps towards bridging linguistic disparities in acoustic assessment.</div></div>","PeriodicalId":48648,"journal":{"name":"Ain Shams Engineering Journal","volume":"16 5","pages":"Article 103312"},"PeriodicalIF":6.0,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143697343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental research on mechanism of scour by submerged jets in consolidated clay

IF 6 2区工程技术

Ain Shams Engineering Journal Pub Date : 2025-03-24 DOI: 10.1016/j.asej.2025.103356

Xing Zhao , Dong Chen , Lianjun Zhao , Wenjiao Zhang , Zhongmei Wang , Caiping Wu

{"title":"Experimental research on mechanism of scour by submerged jets in consolidated clay","authors":"Xing Zhao , Dong Chen , Lianjun Zhao , Wenjiao Zhang , Zhongmei Wang , Caiping Wu","doi":"10.1016/j.asej.2025.103356","DOIUrl":"10.1016/j.asej.2025.103356","url":null,"abstract":"<div><div>This study presents a rapid consolidation device for clay, coupled with a systematic investigation of submerged jet scouring behavior in consolidated clay under varying parametric conditions (soil strength: 25–40 kPa; jet velocity: 7.5–12.5 m/s; nozzle diameter: 5–7 mm; target distance: 0–3 cm). The developed graded vacuum preloading method demonstrates remarkable efficiency in producing hardened sediment specimens (compaction time <192 hr) that exhibit comparable physical properties to naturally consolidated reservoir deposits that have formed over many years. Experimental findings reveal a linear proportionality between shear strength and dry density. Notably, the cohesive nature of consolidated clay fundamentally alters scouring mechanisms through interparticle cementation effects, distinguishing it from non-cohesive soil behavior. Temporal evolution analysis shows the scouring depth follows a second-order exponential growth pattern, progressing through four characteristic phases: (Ⅰ) short start stage (0–3 s), (Ⅱ) rapid development stage (3–35 s), (Ⅲ) slow expansion stage (35–60 s), and (Ⅳ) stable stage (>60 s). Parametric sensitivity studies establish positive correlations between scouring efficiency and jet velocity as well as nozzle diameter, while demonstrating inverse relationships with both target distance and soil strength.</div></div>","PeriodicalId":48648,"journal":{"name":"Ain Shams Engineering Journal","volume":"16 5","pages":"Article 103356"},"PeriodicalIF":6.0,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143683360","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0