International Journal of Engineering - Transactions C: Aspects最新文献_第2页

Development of a Wideband Bi-layered Mantle-Cloak for Perfect Electric Conductor Cylindrical Objects under Obliquely Incident Plane Wave 斜入射平面波下完美电导体圆柱形物体宽带双层斗篷的研制

International Journal of Engineering - Transactions C: Aspects Pub Date : 2023-01-01 DOI: 10.5829/ije.2023.36.12c.04

A. Moosaei, M. H. Neshati

引用次数: 0

Prediction of the Efficiency of Hydraulic Fracturing Based on Reservoir Parameters 基于储层参数的水力压裂效率预测

International Journal of Engineering - Transactions C: Aspects Pub Date : 2023-01-01 DOI: 10.5829/ije.2023.36.12c.05

А. Dieng, G. P. Khiznyk, V. V. Poplygin

{"title":"Prediction of the Efficiency of Hydraulic Fracturing Based on Reservoir Parameters","authors":"А. Dieng, G. P. Khiznyk, V. V. Poplygin","doi":"10.5829/ije.2023.36.12c.05","DOIUrl":"https://doi.org/10.5829/ije.2023.36.12c.05","url":null,"abstract":"According to experts, the use of hydraulic fracturing can increase the oil and gas recovery factor by 10-15%. The Perm Territory belongs to the old oil-producing region of the Russian Federation. To date, more than 60% of the remaining recoverable oil reserves of the fields of the Perm region are concentrated in carbonate deposits. Most of the fields are currently in the late stages of development. These fields, as a rule, are characterized by the presence of undrained zones with residual reserves and low well flow rates. Most of the remaining reserves of the fields are concentrated in low-permeability reservoirs with a high degree of heterogeneity and difficult fluid filtration. Unfortunately, the results obtained in practice do not always correspond to preliminary calculations and do not reach the planned oil production rates. In connection with the above, the problem arises of predicting the effectiveness of hydraulic fracturing operations using mathematical methods of analysis. The effectiveness of hydraulic fracturing is undoubtedly influenced by both geological and technological parameters. In this paper, for the carbonate Kashirsky (K) and Podolsky (Pd) productive deposits of one of the oil fields in the Perm region, using step-by-step regression analysis based on geological and technological parameters, a forecast of the initial oil production rate after hydraulic fracturing was made. There was good agreement between model and experimental results obtained.","PeriodicalId":14066,"journal":{"name":"International Journal of Engineering - Transactions C: Aspects","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135909964","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

Design and Performance Analysis of 6H-SiC Metal-Semiconductor Field-Effect Transistor with Undoped and Recessed Area under Gate in 10nm Technology 10nm下无掺杂凹陷6H-SiC金属半导体场效应晶体管的设计与性能分析

International Journal of Engineering - Transactions C: Aspects Pub Date : 2023-01-01 DOI: 10.5829/ije.2023.36.12c.16

A. Krishnamurthy, D. Venkatarami Reddy, E. Radhamma, B. Jyothirmayee, D. Sreenivasa Rao, V. Agarwal, B. Balaji

{"title":"Design and Performance Analysis of 6H-SiC Metal-Semiconductor Field-Effect Transistor with Undoped and Recessed Area under Gate in 10nm Technology","authors":"A. Krishnamurthy, D. Venkatarami Reddy, E. Radhamma, B. Jyothirmayee, D. Sreenivasa Rao, V. Agarwal, B. Balaji","doi":"10.5829/ije.2023.36.12c.16","DOIUrl":"https://doi.org/10.5829/ije.2023.36.12c.16","url":null,"abstract":"In this paper, the impact of the undoped and recessed gate structure on the performance of the silicon carbide metal semiconductor field effect transistor is presented. The importance of the silicon carbide metal semiconductor field effect transistor analyzed using technology computer aided design simulations in 10 nanometer technology. The proposed undoped gate structure has minimized ionized impurity scattering, leading to increased electron mobility and improved carrier concentration. Performance metrics such as drain current, transconductance, subthreshold slope, and cutoff frequency were evaluated and compared with conventional silicon carbide metal semiconductor field effect transistor structures. The proposed device exhibits superior current driving capabilities, enhanced transconductance, and reduced leakage currents, leading to improved power efficiency. Moreover, the recessed gate structure contributes to a significant reduction in short-channel effects, making the device more suitable for high frequency applications. The simulation parameters were calculated and compared with conventional structure with the length of the source and drain in 10 nanometer node. Therefore the drain current of this proposed device has been improved by 68%.","PeriodicalId":14066,"journal":{"name":"International Journal of Engineering - Transactions C: Aspects","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135447523","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

Enhancing Comfort in Tropical Institutional Buildings: Integrating Thermal, Acoustic and Visual Performance with a Unified Index 提高热带机构建筑的舒适度:用统一的指标综合热、声、视性能

International Journal of Engineering - Transactions C: Aspects Pub Date : 2023-01-01 DOI: 10.5829/ije.2023.36.12c.15

S. Yarramsetty, MVN. Siva Kumar, P. Anand Raj

{"title":"Enhancing Comfort in Tropical Institutional Buildings: Integrating Thermal, Acoustic and Visual Performance with a Unified Index","authors":"S. Yarramsetty, MVN. Siva Kumar, P. Anand Raj","doi":"10.5829/ije.2023.36.12c.15","DOIUrl":"https://doi.org/10.5829/ije.2023.36.12c.15","url":null,"abstract":"This study explores the relationship between a country's level of development and its educational standards, emphasizing the significance of well-equipped universities in ensuring high-quality education. While research on comfort in educational buildings has often focused on individual parameters, such as thermal, acoustic, and visual elements, this paper proposes a new metric that integrates these factors to assess environmental comfort. The research was conducted in six hostel rooms at the National Institute of Technology Warangal (NITW) campus in India, utilizing both objective measurements and subjective surveys. Three single measures were introduced: a thermo-hygrometric index, an audio comfort index, and a visual illumination index, each normalized within a 0-1 range denoting comfort and discomfort conditions. A final total comfort index for each room was established by assigning appropriate weights to the three factors. The findings were compared to the questionnaire responses, evaluating the effectiveness of the proposed methodology. The results indicate a comprehensive assessment of indoor environmental comfort, with acoustic factors showing the least impact on overall comfort conditions. The study recommends equal weighting for thermal, acoustic, and lighting parameters when computing the combined comfort index. The building achieved an overall comfort rating of 0.64 out of 1, indicating a comfortable environment. The study also shows that there is a strong correlation between the new combined comfort index and the results from the questionnaire. `This research contributes a straightforward and integrated approach to gauge comfort levels in educational buildings and lays the groundwork for further assessments of institutional building performance.","PeriodicalId":14066,"journal":{"name":"International Journal of Engineering - Transactions C: Aspects","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135447525","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

Effective Blended Learning Model Selection Based on Student Learning Style using Analytic Hierarchy Process for an Undergraduate Engineering Course 基于学生学习风格的层次分析法的有效混合学习模式选择

International Journal of Engineering - Transactions C: Aspects Pub Date : 2023-01-01 DOI: 10.5829/ije.2023.36.12c.13

S. Maidin, M. A. Shahrum, L. Y. Qian, T. K. Rajendran, S. Ismail

{"title":"Effective Blended Learning Model Selection Based on Student Learning Style using Analytic Hierarchy Process for an Undergraduate Engineering Course","authors":"S. Maidin, M. A. Shahrum, L. Y. Qian, T. K. Rajendran, S. Ismail","doi":"10.5829/ije.2023.36.12c.13","DOIUrl":"https://doi.org/10.5829/ije.2023.36.12c.13","url":null,"abstract":"Blended learning is a flexible method conducted through face-to-face and online learning. It requires students to learn by attempting the classes physically and allows them to learn virtually at different times and places. It has become more evident and common after the Movement Control Order (MCO) as most of the lectures at the university are carried out in hybrid mode. The blended learning models create problems and opportunities for students as they need to explore and adapt to different lecturers' different blended learning methods in terms of teaching styles, planning, and timing. Therefore, the objective of this research is to investigate the best-blended learning models for an undergraduate engineering course based on student learning style by using the Analytic Hierarchy Process (AHP) method, as it is a big challenge to select the most effective approach for universities to educate, tutor and bring out quality students according to their learning styles. The AHP method is used to aid the students in finding the best-blended learning model based on their learning style. AHP analysis is then conducted to validate and verify its accuracy by comparing it with Visual, Auditory, Read/write, and Kinesthetic (VARK) models. As a result, most students are kinaesthetic learners (72%) based on VARK results, and the face-to-face driver model is the most preferred blended learning model with the priority vector at 31.33% through the AHP analysis. The accuracy of the AHP result is 74% by comparing it with the VARK result. In summary, the data can be deployed in the UTeM blended learning system to improve the course design and student learning experience.","PeriodicalId":14066,"journal":{"name":"International Journal of Engineering - Transactions C: Aspects","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135447527","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

Study on Application of Arps Decline Curves for Gas Production Forecasting in Senegal Arps递减曲线在塞内加尔产气预测中的应用研究

International Journal of Engineering - Transactions C: Aspects Pub Date : 2023-01-01 DOI: 10.5829/ije.2023.36.12c.10

А. Dieng, V. V. Poplygin

{"title":"Study on Application of Arps Decline Curves for Gas Production Forecasting in Senegal","authors":"А. Dieng, V. V. Poplygin","doi":"10.5829/ije.2023.36.12c.10","DOIUrl":"https://doi.org/10.5829/ije.2023.36.12c.10","url":null,"abstract":"The purpose of this study is to evaluate the feasibility of using methods for predicting the flow rates of gas wells in fields in Senegal. Accurate forecasting of natural gas production allows you to correctly set the operating mode of wells and design onshore infrastructure. One of the gas fields of Senegal was chosen as the object of study, where deposits were discovered within the exploitation perimeters in the Campanian and Santonian sandstone horizons. Gas formations have high porosity and permeability values, as well as high formation temperatures. Gas well flow rates can be predicted using hydrodynamic models, mathematical models (hyperbolic, etc.) and other methods. This study assessed the possibility of using Arps curves for long-term forecasting of gas flow rate and comparing the forecasting results with actual data. Comparison of Arps curves and actual gas flow rates for wells made it possible to note a discrepancy in the forecast results and actual values of more than 20%. These differences arose for two reasons. Deviations at the initial stage of well operation (6 months), which is associated with the adjustment of the technological operating mode of the well and the establishment of constant parameters of rocks near the wellbore. The second reason is well repairs, which change the properties of rocks near the wellbore. In general, Arps curves of exponential type showed high convergence between predicted and actual values, which makes it possible to use them in predicting the flow rate of gas wells in Senegal.","PeriodicalId":14066,"journal":{"name":"International Journal of Engineering - Transactions C: Aspects","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135447522","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

Partial Enzymatic Hydrolysis of Glucomannan and Its Mathematical Model 葡甘露聚糖部分酶解及其数学模型

International Journal of Engineering - Transactions C: Aspects Pub Date : 2023-01-01 DOI: 10.5829/ije.2023.36.12c.11

D. H. Wardhani, H. Cahyono, H. N. Ulya, A. C. Kumoro, N. Aryant

{"title":"Partial Enzymatic Hydrolysis of Glucomannan and Its Mathematical Model","authors":"D. H. Wardhani, H. Cahyono, H. N. Ulya, A. C. Kumoro, N. Aryant","doi":"10.5829/ije.2023.36.12c.11","DOIUrl":"https://doi.org/10.5829/ije.2023.36.12c.11","url":null,"abstract":"The study of enzymatic hydrolysis of glucomannan (GM) was currently limited to obtain low molecular weight glucomannan, and was not specifically studied for spray drying feed applications. This research aimed to investigate the effect of enzyme concentration and duration of enzymatic hydrolysis of GM on the characteristics of hydrolyzed glucomannan (HGM). Moreover, the kinetic models of viscosity reduction in enzymatic hydrolysis of glucomannan were also studied. To achieve the goal, the GM was hydrolyzed using various enzyme concentrations (5 to 20 mg/l) for 300 min. Profiles of viscosity, average molecular weight (Mw), degree of polymerization, and antioxidant activity of HGM were observed. The kinetics of viscosity reduction was modeled with 1st-order kinetics, 2nd-order model, and Mahammad's order. An enzyme concentration of 20 mg/l (1% GM solution) was the fastest to reach the desired viscosity for spray drying feed purposes. The model of nth-order was the best fitted to the viscosity reduction with R2 equal to 0.9935, so the constants k = 1.1842 (Pa.s n-1.t)-1 and n = 0.6328 are obtained. The hydrolysis improved the antioxidant activity of HGM as the enzyme concentration increases. This antioxidant result highlighted the advantage of using HGM for coating and encapsulating the active compound which also offers oxidation protection.","PeriodicalId":14066,"journal":{"name":"International Journal of Engineering - Transactions C: Aspects","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135447524","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

Numerical/Experimental Studies on Performance at Low Engine Speeds: A Case study Downsized Iranian National Engine (EF7) 低转速下发动机性能的数值/实验研究:以伊朗小型国家发动机(EF7)为例

International Journal of Engineering - Transactions C: Aspects Pub Date : 2021-09-01 DOI: 10.5829/IJE.2021.34.09C.11

null Namar, null Jahanian, null Shafaghat, Kamyar Nikzadfar

{"title":"Numerical/Experimental Studies on Performance at Low Engine Speeds: A Case study Downsized Iranian National Engine (EF7)","authors":"null Namar, null Jahanian, null Shafaghat, Kamyar Nikzadfar","doi":"10.5829/IJE.2021.34.09C.11","DOIUrl":"https://doi.org/10.5829/IJE.2021.34.09C.11","url":null,"abstract":"Engine downsizing is a trusted method to reduce fuel consumption and pollution emitted from internal combustion engines. In this method, engine displacement volume is reduced while maintaining the same power/torque characteristics. However, there still exist several limitations to utilize this technology. In this paper, the naturally aspirated type of Iranian national engine (EF7-NA) for a possible downsized version is investigated. A one-dimensional engine model equipped with a zero-dimensional two-zone combustion sub-model was developed and validated via experimental results for both natural aspirated and turbocharged engine types. Then experimental and numerical studies were carried out for the primary concept, deactivation of one cylinder besides using a turbocharger. To overcome the concept shortages, especially in lower ranges of engine speed, numerical studies were extended. Deployment of several turbochargers with different performance maps and different valve timing via a dual continuous variable valve timing (CVVT) system were investigated. The results showed that there is a feasible method for EF7 engine downsizing via a 3-cylinder type equipped with a modified turbocharger and valve timing. The maximum difference between base-engine and downsized version torque is about 7% in low engine speeds.","PeriodicalId":14066,"journal":{"name":"International Journal of Engineering - Transactions C: Aspects","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74805183","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 the Reliability of PwCOV: A Loosely Coupled Software as a Service for COVID-19 Data Processing System PwCOV的可靠性评估:一种新型冠状病毒数据处理系统的松耦合软件即服务

International Journal of Engineering - Transactions C: Aspects Pub Date : 2020-01-01 DOI: 10.5829/ije.2020.33.12c.09

A. Bora, T. Bezboruah

{"title":"Evaluating the Reliability of PwCOV: A Loosely Coupled Software as a Service for COVID-19 Data Processing System","authors":"A. Bora, T. Bezboruah","doi":"10.5829/ije.2020.33.12c.09","DOIUrl":"https://doi.org/10.5829/ije.2020.33.12c.09","url":null,"abstract":"The pandemic coronavirus diseases 2019 are generating different data sets in different regions of the world The data sets are observed to be available in geographically separated medical entities However, the demand for accessing and reliable delivery of such datasets through a web-based module is increasing gradually In this work, we propose a novel cycle of reliability evaluation model for deployment of Software as a Service-based prototype for the coronavirus disease data processing system We call it as PwCOV The prototype generates clinical remarks through the paradigm of service-oriented computing, cluster-based load balancing web servers, and loosely coupled software principles The applicability of PwCOV for processing isolated disease datasets is discussed against different stress of set of user entities The validity and applicability of the proposed model are evaluated through statistical analysis The reliability of the PwCOV is observed by evaluating the recorded status of the business logic execution, failure count and failure rate The study reveals that the PwCOV is affective for processing disease data set for a collaborative set of tenants A novel methodology is designed for the deployment of software as a service for the COVID-19 data processing system using a load balancing cluster base web server, where the roles of service-oriented computing are segregated among different layers The limitation of such deployment is also discussed for multi-tenant environment © 2020, Materials and Energy Research Center All rights reserved","PeriodicalId":14066,"journal":{"name":"International Journal of Engineering - Transactions C: Aspects","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81187606","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: 2

A 3D Numerical and Empirical Study on the Effects of Injection Pressure and Temperature on the Quality of Produced Mold 注射压力和温度对成型模具质量影响的三维数值与实证研究

International Journal of Engineering - Transactions C: Aspects Pub Date : 2017-10-12 DOI: 10.5829/ije.2018.31.03c.12

S. Rahimi, Z. Baniamerian, S. Mazdak, E. S. Tashnizi

引用次数: 2