Ain Shams Engineering Journal最新文献

{"title":"BIM implementation in project management practices for sustainable development: Partial Least square approach","authors":"Muhammad Sajjad, Anfeng Hu, Dorin RADU, Ahsan Waqar, Hamad R. Almujibah, Abdul Mateen","doi":"10.1016/j.asej.2024.103048","DOIUrl":"https://doi.org/10.1016/j.asej.2024.103048","url":null,"abstract":"As an emerging area with far-reaching implications for project management practices, Despite the growing global adoption of Building Information Modelling (BIM), its implementation in the Pakistani construction sector faces significant challenges, particularly in relation to conflict and risk management, communication, and technical safety practices. The primary objective of this study is to identify and evaluate the key factors influencing BIM adoption in Pakistan, with a specific focus on understanding the roles of conflict and risk management, communication, technical safety management, and resource management in successful BIM implementation. The research used a combined pilot survey with 90 contributors, a prime questionnaire with 125 contributors, an exploratory factor analysis (EFA), and a structural equation modelling (SEM) approach has been used to do in depth statistical analysis. The results indicated the highest relation among planning and technical safety management and BIM implementation with path impact value of 0.613 followed by conflict and risk management with path value 272. According to the findings, every contributes appreciably to BIM’s usefulness in construction and project management. This examination contributes to the development of BIM research.","PeriodicalId":48648,"journal":{"name":"Ain Shams Engineering Journal","volume":null,"pages":null},"PeriodicalIF":6.0,"publicationDate":"2024-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142261550","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Daylighting and energy consumption in museums and bridging the gap by multi-objective optimization","authors":"","doi":"10.1016/j.asej.2024.102944","DOIUrl":"10.1016/j.asej.2024.102944","url":null,"abstract":"<div><p>Museums environment is complicated and defined by indoor air quality, thermal and lighting comfort. Artifacts deterioration is factored by extreme conditions of thermal exposure or excessive lighting. With high control required for exposed old monuments and visitor comfort, museums energy systems reach extreme levels. In this paper, we aim to find the gap in museums high energy loads and reach solutions through architectural design. The paper studies comparison results for different techniques in fifty recent case studies to identify the specific factors that matter most to museum buildings. These factors are implemented simultaneously on one base model in three climatic states by multi-objective optimization. The best option will showcase each climate optimum conditions. The paper introduces optimum architectural procedures optimizing sDA and ASE to minimum 70% and maximum 10% respectively while decreasing thermal load. The results help architects and policy makers achieve daylighting and energy optimization in museums through architecture.</p></div>","PeriodicalId":48648,"journal":{"name":"Ain Shams Engineering Journal","volume":null,"pages":null},"PeriodicalIF":6.0,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2090447924003198/pdfft?md5=c27f2a387edd980e15ea10ab0acb4173&pid=1-s2.0-S2090447924003198-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142272985","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}

{"title":"An Improved digital multi-resonant controller for 3 [formula omitted] grid-tied and standalone PV system under balanced and unbalanced conditions","authors":"Kamran Zeb, T.D.C. Busarello, Waqar Uddin, Muhammad Khalid","doi":"10.1016/j.asej.2024.103036","DOIUrl":"https://doi.org/10.1016/j.asej.2024.103036","url":null,"abstract":"With the exponential penetration of Photovoltaic (PV) plants into the power grid, advanced current controllers should be employed in grid-tied power converters in order to efficiently inject high quality current synchronized with the grid voltage. This research presents the modeling and design of a digital multi-resonant controller to feed-in high quality current. The novelty lies in designing the control in a superior manner to conventional techniques. As an outcome, practical engineers discover an easy, fast, robust, and accurate control method. The proposed 5-kVA PV system can inject active and reactive power effectively while staying resilient to imbalance scenarios. Synchronization is accomplished via a synchronous reference frame (SRF) based phase locked loop (PLL) that performs effectively even with distorted and nonideal grids. The practicality and efficacy of the developed controller is verified both in simulation (PSIM and code composer studio) and Hardware in Loop (HIL) via Typhoon 402 and TMS32F28335 experiments. The devised controller is evaluated in both grid-connected and standalone modes under a wide range of disturbances, distortions, and non-ideal conditions. The simulation and HIL results validate the robustness, fastness, resilience, and effectiveness of the proposed controller compared with a well-tuned conventional proportional resonant (PR) controller.","PeriodicalId":48648,"journal":{"name":"Ain Shams Engineering Journal","volume":null,"pages":null},"PeriodicalIF":6.0,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209453","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"On the modeling and computation of molecular descriptors of a novel next-generation wonder material γ-graphyne and zig-zag Gamma graphyne nanoribbon","authors":"","doi":"10.1016/j.asej.2024.102868","DOIUrl":"10.1016/j.asej.2024.102868","url":null,"abstract":"<div><p>Researchers have been trying to synthesize a novel carbon form called Graphyne. For over a decade but with no success. Recently, some researchers have made a breakthrough in generating Carbons elusive allotrope and solved a long-standing problem in carbon materials. This wonder material is created to rival the conductivity of graphene but with control. These results opened new ways of research in the fields of semiconductors, electronics and optics. Topological indices are mathematical descriptors of the Structure of a molecule that can be used to predict its properties. They are derived from the graph theory, which describes the topology of a molecule and its connectivity. γ- graphyne is a specific type of graphyne, which is a carbon-based material similar to graphene. In this paper our focus is on two structures made from hexagonal honeycomb graphite lattices, like γ- graphyne,and Zig-zag Gamma graphyne nanoribbon. The first, second, third and fourth Zagreb indices, the first and second hyper-Zagreb indices, third redefined Zagreb indices, are all computed in this paper. Furthermore mathematical closedform expressions for some of its essential degree-based molecular descriptors are derived. These obtained results will help to investigate the structure–property relationships in γ-Graphyne.</p></div>","PeriodicalId":48648,"journal":{"name":"Ain Shams Engineering Journal","volume":null,"pages":null},"PeriodicalIF":6.0,"publicationDate":"2024-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2090447924002430/pdfft?md5=668d5898645c9cb8afa085959395f065&pid=1-s2.0-S2090447924002430-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142272986","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}

{"title":"Non-Fourier heat and mass transport enhancement by hybrid nanofluid-flow over a non-linearly stretchable surface having variable thickness","authors":"","doi":"10.1016/j.asej.2024.102980","DOIUrl":"10.1016/j.asej.2024.102980","url":null,"abstract":"<div><p>This article uses non-classical Fick's law, non-Fourier's law, and conservation laws for mass and thermal transport. The hybrid nanoparticles <em>Cu</em> and <span><math><mi>A</mi><msub><mrow><mi>l</mi></mrow><mrow><mn>2</mn></mrow></msub><msub><mrow><mi>O</mi></mrow><mrow><mn>3</mn></mrow></msub></math></span> are considered. The new correlations among the thermo-physical properties of base fluid, <em>Cu</em> and <span><math><mi>A</mi><msub><mrow><mi>l</mi></mrow><mrow><mn>2</mn></mrow></msub><msub><mrow><mi>O</mi></mrow><mrow><mn>3</mn></mrow></msub></math></span> are coupled with simplified nonlinear mathematical models. The resulting models are solved numerically by the finite element method (FEM). The linear shape functions are chosen for the approximation of residual equations. This approximation leads to a nonlinear algebraic system that is linearized by the Picard scheme. The numerical results are ensured to be grid-independent, and convergence is analyzed. The results are validated, and an excellent agreement is obtained between available benchmarks and current outcomes. Thermal solutal relaxation phenomena are responsible for a significant reduction in the transport of heat and mass in Newtonian fluids. These non-Fourier's and non-classical Fick's laws are capable of capturing thermal and solutal elastic phenomena, respectively. <em>Cu</em> and <span><math><mi>A</mi><msub><mrow><mi>l</mi></mrow><mrow><mn>2</mn></mrow></msub><msub><mrow><mi>O</mi></mrow><mrow><mn>3</mn></mrow></msub></math></span> simultaneously act as good conductors of heat, and their simultaneous dispersion in base fluid results in a significant rise in thermal conductivity. Numerical experiments have shown that the transport of heat can be optimized by simultaneous suspension of <em>Cu</em> and <span><math><mi>A</mi><msub><mrow><mi>l</mi></mrow><mrow><mn>2</mn></mrow></msub><msub><mrow><mi>O</mi></mrow><mrow><mn>3</mn></mrow></msub></math></span>.</p></div>","PeriodicalId":48648,"journal":{"name":"Ain Shams Engineering Journal","volume":null,"pages":null},"PeriodicalIF":6.0,"publicationDate":"2024-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2090447924003551/pdfft?md5=b3e2670ea452be80735d290db08c0f8d&pid=1-s2.0-S2090447924003551-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142272776","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}

{"title":"Stability enhancement and EMI mitigation in SSBC by soft switching and slope compensation techniques","authors":"","doi":"10.1016/j.asej.2024.102969","DOIUrl":"10.1016/j.asej.2024.102969","url":null,"abstract":"<div><p>This paper proposes a control technique of soft switching operation or quasi-resonance intrusion along with slope compensation in a conventional Hard Switched Boost Converter (HSBC) to realize the proposed Soft Switched Boost Converter (SSBC) under Current Mode Control (CMC for a part of the switching cycle to mitigate intermittent instabilities, Electro Magnetic Interference (EMI) and to extend the stable operating region. An intensified stability analysis was performed and the viability of the converter was tested with the effect of diversified periodic interference signals and comparative analysis was made between HSBC and SSBC. The impact of switching manifold due to the increase in modes of operation by soft switching was considered. The system dynamics were captured using MATLAB/Simulink, and the results were validated using appropriate experimental setup results. Furthermore, to demonstrate the proposed control technique’s improved stability, theoretical bifurcation analysis was performed in SSBC as Power Factor Correction (PFC) converter.</p></div>","PeriodicalId":48648,"journal":{"name":"Ain Shams Engineering Journal","volume":null,"pages":null},"PeriodicalIF":6.0,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2090447924003447/pdfft?md5=7e6acd92aca7bfadc679133ee2008406&pid=1-s2.0-S2090447924003447-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142272885","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}

{"title":"Soret-Dufour mechanisms and thermal radiation effects on magnetized SWCNT/MWCNT nanofluid in a convective transport and solutal stratification analysis","authors":"","doi":"10.1016/j.asej.2024.102853","DOIUrl":"10.1016/j.asej.2024.102853","url":null,"abstract":"<div><p>This research elucidates the mechanisms of Soret-Dufour on magnetized SWCNT/MWCNT nanofluid in a convective transport and solutal stratification analysis. The solutal stratification plays a significant role in this study's heat and mass transfer process. The solutal stratification involves the distribution of nanoparticles within the boundary layer flow regime. The fluid flow was considered to<!--> <!-->rotate vertically downward/upward in a disk and the physical interpretation is presented as partial differential equations (PDEs). The set of PDEs was first changed into total differential equations before applying the numerical scheme of the spectral relaxation method (SRM). The magnetized SWCNT/MWCNT's numerical simulations were<!--> <!-->rigorously examined using the iterative techniques of SRM. The crucial role of pertinent flow parameters is graphically illustrated while the calculated values of engineering quantities of interest are tabulated. The azimuthal profile increases due to an increase in the magnetic parameter. An increase in the Prandtl number was found to depreciate the velocity alongside the temperature profile because of the low thermal conductivity possessed by water. A rise in thermal radiation increases the fluid thermal condition by enhancing the temperature profile. The present analysis was compared with the analysis in the literature and was found to be in good agreement.</p></div>","PeriodicalId":48648,"journal":{"name":"Ain Shams Engineering Journal","volume":null,"pages":null},"PeriodicalIF":6.0,"publicationDate":"2024-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2090447924002284/pdfft?md5=204cb8ffb77957074eb617e50769348f&pid=1-s2.0-S2090447924002284-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142272847","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}

{"title":"Analysis of Monte-Carlo collision method with argon and helium background gases at different RF-powers and pressures in ELTRAP device","authors":"Hassan Ali, Nisar Ali, Ahmed Sayed M. Metwally, Arshad Ali, Musarrat Jabeen","doi":"10.1016/j.asej.2024.102999","DOIUrl":"https://doi.org/10.1016/j.asej.2024.102999","url":null,"abstract":"The impact of confined excited electron with argon and helium background gases is systematically studied using Monte-Carlo particle-in-cell simulations for various low powers (1.0–8.0 V) and pressures (1.50 × 10 Torr and 3.75 × 10 Torr) in ELTRAP device. The results of these numerical studies showed that the heating effect of the excited confined electron plasma density of 5 × 10 m within the Brillouin limit () resulted a higher temperature (eV) and increased collision time in argon as a background gas as compared to helium gas. The axial temperature (eV) has a higher value than the radial temperature (eV) and increases with the increase in RF-Powers and pressures. The maximum kinetic energy of excited confined electrons occurred in the range of 0.03–0.04 m radially due to the maximum self-electric field intensity in simulation time up to 20 µs. The electric field decreases when the collision frequency is increased. The secondary electron production and ionization are higher than expected at a background pressure of 1.50 × 10 Torr as compared to 3.75 × 10 Torr. The remaining secondary electrons were always ejected from the symmetry axis of the device. It was observed that the production of secondary electrons is proportional to the ionization rate.","PeriodicalId":48648,"journal":{"name":"Ain Shams Engineering Journal","volume":null,"pages":null},"PeriodicalIF":6.0,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209455","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Normalized signature graph of analog circuits for fault classification using digital testing","authors":"","doi":"10.1016/j.asej.2024.102965","DOIUrl":"10.1016/j.asej.2024.102965","url":null,"abstract":"<div><p>This paper presents the power-on signature graph of analog circuits for fault classification. This graph can be attained using the simulation mechanism through the practical circuit simulator and the hardware mechanism through the mixed-signal design. The presented signature graph is influenced by changes in pass-band transmission and bandwidth as a result of device under test (<em>DUT</em>) component modifications. In order to exercise the frequency band of the <em>DUT</em> for fault stimulation, sinusoidal waveforms wiped at their frequencies are produced using the analog waveform generator (<em>AWG</em>). The analog compactor is devised to accumulate the output samples from the <em>DUT</em> for signature generation, compared with global signature boundaries derived from the worst-case analysis. The built-in self-test controller is devised to properly synchronize the process of analog test cycle for proper signature generation. Two <em>DUTs</em> chosen from a variety of analog circuits in frequency bands used in medical applications are subjected to this testing mechanism. Due to the difference between the wiped sinusoidal frequencies of the <em>AWG</em> in the simulation mechanism and the hardware mechanism, the normalized signature graphs of each component in <em>DUTs</em> using both mechanisms are developed to attain the approved convergences between the two mechanisms.</p></div>","PeriodicalId":48648,"journal":{"name":"Ain Shams Engineering Journal","volume":null,"pages":null},"PeriodicalIF":6.0,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S209044792400340X/pdfft?md5=61317a5c4bd00b1cf4ce9561a81f14d9&pid=1-s2.0-S209044792400340X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142272777","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}

{"title":"Theoretical and experimental study on determining the reasonable cropping process parameters of precision cropping system","authors":"","doi":"10.1016/j.asej.2024.102958","DOIUrl":"10.1016/j.asej.2024.102958","url":null,"abstract":"<div><p>A new controllable rotary bending cracking cropping method, based on V-notch stress concentration, is proposed to address the drawbacks of the metal bar separation process, such as poor cross-section quality and low material utilization. The controlled rotary bending cracking cropping experimental device is developed to implement this method. Subsequently, a mechanical model for the precision cropping process is established using material strength theory, and a load control strategy based on fracture mechanics theory is applied to predict cropping efficiency. Experimental verification is then conducted, with results indicating that increasing notch depth improves cropping efficiency and cross-section quality. Additionally, maintaining constant stress intensity factor amplitude (Δ<em>K</em> = 0.4<em>K</em>_c) and notch depth of 5 mm yields optimal cropping effects. The precision cropping process leverages the fatigue crack propagation mechanism to explain the cropping process, offering theoretical guidance for selecting appropriate parameters in subsequent precision cropping processes.</p></div>","PeriodicalId":48648,"journal":{"name":"Ain Shams Engineering Journal","volume":null,"pages":null},"PeriodicalIF":6.0,"publicationDate":"2024-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2090447924003332/pdfft?md5=70b05a02b6cdafc4690c92c1a8e2070b&pid=1-s2.0-S2090447924003332-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141964344","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}