Engineering Reports最新文献

Development and characterization of in‐situ nickel aluminide reinforced Al‐Si matrix composites by stir casting 通过搅拌铸造开发原位铝化镍增强铝硅基复合材料并确定其特性

Engineering Reports Pub Date : 2024-07-25 DOI: 10.1002/eng2.12966

A. Saiyathibrahim, V. Jatti, P. Dhanapal, D. Mohan

{"title":"Development and characterization of in‐situ nickel aluminide reinforced Al‐Si matrix composites by stir casting","authors":"A. Saiyathibrahim, V. Jatti, P. Dhanapal, D. Mohan","doi":"10.1002/eng2.12966","DOIUrl":"https://doi.org/10.1002/eng2.12966","url":null,"abstract":"Aluminium matrix composites (AMCs) exhibit promising mechanical properties that are required for the aeronautical and automotive industries. In the current research, A413 (eutectic AlSi) alloy is employed as matrix material, and nickel based trialuminide (Al3Ni) with primary Si particles as reinforcements to manufacture aluminium matrix composites through the stir casting process. A total of three varieties of composite alloys containing 3, 6, and 9 wt% of nickel were used to fabricate stir cast composites, and their microstructural features, along with mechanical properties, such as tensile strength, impact strength, and hardness, were evaluated. Furthermore, the dry sliding wear behavior for three different applied loads (10, 20, and 30 N) was studied. Scanning electron microscopy (SEM) revealed nucleation of Al3Ni nickel trialuminide and increase of primary Si phases as well as exhibited even dissemination of such reinforcements in α‐Al. The composite with the highest nickel content (9 wt%) had a microstructure that consisted of 31 vol% in‐situ Al3Ni intermetallic and 8.1 vol% primary Si particles. This composite demonstrated a maximum increase of 25.93% in hardness and 40.30% in tensile strength. The quality index values of composites with in‐situ reinforcements were higher compared to that of A413 alloy, which had the lowest quality index value of 248.83 MPa, representing a 9.91% decrease. The impact strength of the composite was found to be reduced by a maximum of 50% and showed a significant loss in ductility also when compared with A413 aluminium alloy. Wear resistance was found to be increased with the evolution of in‐situ reinforcements inside the matrix, whereas an increase in applied load resulted in a higher wear rate. The uniform dispersion and good interfacial bonding between the aluminium matrix and in‐situ reinforcements (nickel trialuminide and primary Si) are showing preeminent mechanical properties and can be a novel composite material for industrial applications.","PeriodicalId":11735,"journal":{"name":"Engineering Reports","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141803090","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An AI based cross‐language aspect‐level sentiment analysis model using English corpus 利用英语语料库建立基于人工智能的跨语言方面情感分析模型

Engineering Reports Pub Date : 2024-07-25 DOI: 10.1002/eng2.12969

Jing Chen, Li Pan

{"title":"An AI based cross‐language aspect‐level sentiment analysis model using English corpus","authors":"Jing Chen, Li Pan","doi":"10.1002/eng2.12969","DOIUrl":"https://doi.org/10.1002/eng2.12969","url":null,"abstract":"Accurate cross‐language aspect‐level sentiment analysis methods can provide accurate decision support for social networks, e‐commerce platforms, and other platforms, thereby providing users with higher quality services. However, actual data is very complex and contains a large amount of redundant information. Existing methods face challenges in extracting semantic association information and deep emotional features when dealing with this complex data. To address these issues, an aspect‐level sentiment analysis model (called Multi‐XLNet‐RCNN) is proposed that integrates multi‐channel XLNet and RCNN. First, a multi‐channel XLNet (Multi XLNet) network model is used to perform autoregressive encoding operations on different languages, fully extracting contextual information from the text and better characterizing the ambiguity of the text. Then, in the RCNN module, the contextual features output by the BiGRU layer are concatenated with the pre trained input features to extract deeper emotional features. Finally, in response to the issue of inconsistent aspect‐level information in sentence features extracted from different language channels, a multi head attention mechanism based on aspect class interaction is utilized to obtain a text attention emotion representation for a given aspect, thereby improving the accuracy of aspect‐level emotion classification. The experiment uses the public English corpus provided by SemEval 2016 as the source language, and Chinese comment data on Dianping and JD E‐commerce platforms as the target language. The experimental results show that the proposed Multi XLNet‐RCNN sentiment analysis method can achieve accurate aspect‐level Sentiment analysis, and the accuracy rates on the two data sets of Dianping and Jingdong E‐commerce can be as high as 0.851 and 0.792, respectively, superior to other advanced comparison models. This model has good application value in cross‐language analysis of social networks and e‐commerce platforms.","PeriodicalId":11735,"journal":{"name":"Engineering Reports","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141802443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Evaluating ground vibration attenuation through leca‐filled trenches: A support vector machine approach 评估 Leca 填充沟槽的地面振动衰减：支持向量机方法

Engineering Reports Pub Date : 2024-07-25 DOI: 10.1002/eng2.12960

Mohsen Naghizadeh Rokni, Omid Tavasoli, Reza Esmaeilabadi, Amirpouya Saraf

引用次数: 0

Performance of dual‐chamber oscillating water column device under irregular incident waves using Reynolds averaged Navier–Stokes model 使用雷诺平均纳维-斯托克斯模型分析双腔振荡水柱装置在不规则入射波下的性能

Engineering Reports Pub Date : 2024-07-22 DOI: 10.1002/eng2.12970

S. Koley, Parothidil Anjusree Krishnan, Amya Ranjan Ray, Artem Krasovsky

引用次数: 0

Performance of multilayered porous breakwater under irregular waves having different wave spectrum 多层多孔防波堤在不同波谱的不规则波下的性能

Engineering Reports Pub Date : 2024-07-18 DOI: 10.1002/eng2.12964

Santanu Kumar Dash, S. Koley, Subhendu Paul, Rajdip Dey, Maheswaran S

{"title":"Performance of multilayered porous breakwater under irregular waves having different wave spectrum","authors":"Santanu Kumar Dash, S. Koley, Subhendu Paul, Rajdip Dey, Maheswaran S","doi":"10.1002/eng2.12964","DOIUrl":"https://doi.org/10.1002/eng2.12964","url":null,"abstract":"In this present work, the performance of a two‐layered thick porous breakwater of trapezoidal structure is investigated under the action of irregular waves. To investigate the physical problem, the classical linear water wave theory has been taken into consideration. To analyze the effect of irregular waves on the multilayered structure, two unidirectional wave spectra, namely the Pierson–Moskowitz and JONSWAP spectra based on the frequency domains are considered. Three different sea states are taken to analyze the impact of irregular waves on the multilayered porous breakwater. The constant boundary element method is used to handle the aforementioned boundary value problem, which is considered one of the most efficient numerical tools for handling complex structured open sea problems. Several wave characteristics associated with the spectral density functions are demonstrated and analyzed for a variety of structural and spectral parameters. The findings suggest that the adoption of suitable porous material for the construction of these breakwaters can significantly enhance the energy dissipation and thereby minimize the wave force on the structure.","PeriodicalId":11735,"journal":{"name":"Engineering Reports","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141827259","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Significance of addition of carbon nanotubes and fly ash on the wear and frictional performance of aluminum metal matrix composites 添加碳纳米管和粉煤灰对铝金属基复合材料磨损和摩擦性能的影响

Engineering Reports Pub Date : 2024-02-14 DOI: 10.1002/eng2.12865

Udaya Devadiga, Peter Fernandes, A. Buradi, Addisu Frinjo Emma

{"title":"Significance of addition of carbon nanotubes and fly ash on the wear and frictional performance of aluminum metal matrix composites","authors":"Udaya Devadiga, Peter Fernandes, A. Buradi, Addisu Frinjo Emma","doi":"10.1002/eng2.12865","DOIUrl":"https://doi.org/10.1002/eng2.12865","url":null,"abstract":"In order to improve the wear and frictional behavior of the aluminum metal matrix composites, carbon nanotube, and fly ash were added as reinforcements. Powder metallurgy technique was used to fabricate the hybrid metal matrix composites. Experimentations were carried out using pin on disc type wear test rig. The analyzed experimental results showed that, in comparison to the pure aluminum and mono reinforcement combination, the wear loss and coefficient of friction of hybrid metal matrix composites were greatly reduced. It was noted that compared to pure aluminum wear loss was decreased to 89.58%, 86.97%, 83.3% by adding 0.25, 0.5, 0.75 wt% carbon nanotube (CNT), respectively. By the addition of 4, 8 and 16 wt% FA to pure Al wear loss was decreased to 83.85%, 89.58%, and 78.12%, respectively. It was also noted that compared to Al/8 wt% FA mono reinforced composites, wear loss was decreased to 77%, 71.26%, and 53.22% with the addition of 0.25, 0.5, 0.75 wt% CNT, respectively. With the addition of 4, 8, 16 wt% FA, wear loss decreased to 81%, 88%, and 75% over Al/0.25 wt% CNT composites, respectively. The microstructural study of the worn‐out surfaces revealed low abrasive and adhesive wear by the presence of carbon nanotubes and fly ash in aluminum metal matrix. The reinforcing mechanisms of the wear and frictional properties were also discussed.","PeriodicalId":11735,"journal":{"name":"Engineering Reports","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139838472","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A proposal of teaching operational research in online contexts: An experience with SageMath in Brazil 在线运筹学教学建议：巴西 SageMath 的经验

Engineering Reports Pub Date : 2024-02-13 DOI: 10.1002/eng2.12863

Georgia de Souza Assumpção, Carolina Maia dos Santos, Daniele de Lima Campello, Leonardo Silva de Lima, Alexandre de Carvalho Castro

{"title":"A proposal of teaching operational research in online contexts: An experience with SageMath in Brazil","authors":"Georgia de Souza Assumpção, Carolina Maia dos Santos, Daniele de Lima Campello, Leonardo Silva de Lima, Alexandre de Carvalho Castro","doi":"10.1002/eng2.12863","DOIUrl":"https://doi.org/10.1002/eng2.12863","url":null,"abstract":"The paper analyzes how to improve the teaching of Operational Research, focusing on distance learning courses where professors and students are separated through space and time. This case study was done in a public Industrial Engineering undergraduate course, and the work structure is divided into three main parts: an exploratory‐descriptive documentary analysis, application of free software, and evaluation of learning. The authors showed the feasibility of using the SageMath tool in the teaching‐learning process. The study revealed the importance of developing alternative solutions to educational realities marked by economic and financial constraints, where structure teaching with free software is a ruling factor once Engineering education is not a similar global event everywhere. Distance learning is a phenomenon that has been growing over the last 20 years in Brazil, but this was one of the first experiences with the use of SageMath. So, it can serve as a reference for countries with socioeconomic conditions similar to Brazil. Also, this case study can help other professors to enhance their teaching in a distance learning context even in scarcity scenarios of educational resources. The software implementation would be justified in part of the groups studied.","PeriodicalId":11735,"journal":{"name":"Engineering Reports","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139780897","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Propionic acid production by Propionibacterium acidipropionici CDBB‐B‐1981 from enzymatic hydrolysates of Agave bagasse pretreated by steam explosion 酸性丙酸丙酸杆菌 CDBB-B-1981 从经蒸汽爆炸预处理的龙舌兰甘蔗渣酶水解物中生产丙酸的情况

Engineering Reports Pub Date : 2024-02-13 DOI: 10.1002/eng2.12858

Veronica Duran‐Cruz, Sergio Hernández, I. Ortíz

{"title":"Propionic acid production by Propionibacterium acidipropionici CDBB‐B‐1981 from enzymatic hydrolysates of Agave bagasse pretreated by steam explosion","authors":"Veronica Duran‐Cruz, Sergio Hernández, I. Ortíz","doi":"10.1002/eng2.12858","DOIUrl":"https://doi.org/10.1002/eng2.12858","url":null,"abstract":"The biochemical pathway for propionic acid (PA) production is an interesting alternative that can include the utilization of biomass as feedstock. This study evaluated the utilization of Agave bagasse (AB), a lignocellulosic residue, to produce PA by Propionibacterium acidipropinici in batch systems (125 mL‐hermetic bottles and 1000 mL‐bioreactor). The process included a steam explosion pretreatment at 142°C for 15 min and enzymatic hydrolysis, where solid loading (2.75% and 5% in pretreatment and 2.5%, 3.75%, and 5% in enzymatic hydrolysis) was evaluated. Furthermore, the enzymatic concentrations of 18.3 filter paper unit (FPU)/gAB (1×) of Cellic® CTec2 and 1.5× and 3× were tested. The yields of total carbohydrates (TC) obtained at the two solid loadings tested in the pretreatment were statistically similar, but the 3x enzymatic concentration enhanced the yields of TC, glucose, and xylose (0.23 ± 0.01, 0.15 ± 0.01 and 0.03 ± 0.01 g/gAB, respectively). The hydrolysates obtained under these conditions were evaluated as carbon sources for PA production, obtaining a productivity of 0.069 ± 0.006 g/L h and a yield product/substrate of 0.44 gPA/gTC. The control of pH in the culture reduced the fermentation time in the bioreactor by 52% compared with the hermetic bottles without pH control. The potential of hydrolysates as carbon sources for PA production was evidenced, as approximately 50% of the initial carbon was converted to this product. The observed yield product/substrate was similar to those reported from hydrolysates of diverse biomass types, pretreatments, or enzymatic cocktails and the same or related microorganisms. However, the system studied has advantages, such as not requiring the addition of chemical or detoxification stage, and lower temperature and time compared to other pretreatments.","PeriodicalId":11735,"journal":{"name":"Engineering Reports","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139781797","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A defect location method for power cable based on Burg power spectral 基于伯格功率谱的电力电缆缺陷定位方法

Engineering Reports Pub Date : 2024-02-08 DOI: 10.1002/eng2.12859

Zhirong Tang, Kaihua Zhou, Yun Li, P. Meng

{"title":"A defect location method for power cable based on Burg power spectral","authors":"Zhirong Tang, Kaihua Zhou, Yun Li, P. Meng","doi":"10.1002/eng2.12859","DOIUrl":"https://doi.org/10.1002/eng2.12859","url":null,"abstract":"The frequency‐domain reflection (FDR) has been demonstrated to be a trustworthy technique in solving the defect location of power cable by field experiments. However, the location spectrum of the FDR requires manual window smoothing and can be disturbed by spurious peaks. Aiming at these shortcomings of FDR, a new method of cable defect location based on Burg power spectral (BPS) is introduced in this paper. The idea of this method is to use linear difference variance to fit the distribution of reflection coefficient spectrum and build an auto‐regressive (AR) model. The Burg algorithm is employed to estimate the coefficients model and calculate the power distribution of the AR model. Then, the cable defects will be located by BPS with high precision and resolution. In this method, the fast Fourier transform (FFT) with windowed function is replaced by an AR model without windowed function. This suppressed the impact of spurious peaks or spectrum leakage in FFT on the localization defects, and the localization resolution is higher. Finally, we validate the feasibility and effectiveness of BPS through experiments conducted on a 500 m laboratory cable and a 9.6 km submarine cable.","PeriodicalId":11735,"journal":{"name":"Engineering Reports","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2024-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139853716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Orientation‐dependent mechanical responses in molybdenum‐rhenium alloys evaluated via micro‐pillars 通过微柱评估钼铼合金的定向机械响应

Engineering Reports Pub Date : 2024-02-06 DOI: 10.1002/eng2.12829

Hailong Xu, Li Huang, Wen Zhang, Jing Liang, Xuanqiao Gao, Jianfeng Li

引用次数: 0