Journal of Engineering Research and Sciences最新文献_第10页

Determining the Parameters of the Sine-Wave Filter Factors Affecting Filtration Quality 确定影响滤波质量的正弦波滤波器参数

Journal of Engineering Research and Sciences Pub Date : 2022-04-01 DOI: 10.55708/js0104015

P. Mikhail

引用次数: 1

MC-SPWM and MC-THIPWM Methods for Symmetric and Asymmetric Design of CHB-MLI: A Study CHB-MLI对称与非对称设计的MC-SPWM和MC-THIPWM方法研究

Journal of Engineering Research and Sciences Pub Date : 2022-04-01 DOI: 10.55708/js0104017

Jigneshkumar Patel, Vijay K. Sood

{"title":"MC-SPWM and MC-THIPWM Methods for Symmetric and Asymmetric Design of CHB-MLI: A Study","authors":"Jigneshkumar Patel, Vijay K. Sood","doi":"10.55708/js0104017","DOIUrl":"https://doi.org/10.55708/js0104017","url":null,"abstract":": Cascaded H-bridge multilevel inverters (CHB-MLI) are employed in a variety of medium/high power applications. These inverters are known to inject unwanted harmonics into the grid, which negatively affects the grid and connected loads. CHB-MLI topology can reduce many of these harmonics by producing multiple output voltage levels and improves the fundamental component using a suitable modulation technique. However, the CHB-MLI topology configuration requires multiple isolated input sources which must be balanced either with the modulation technique or with an additional method. This paper analyzes multi-carrier pulse width modulation (MC-PWM) techniques for CHB-MLIs. In this study, two basic configurations of CHB-MLI symmetrical and asymmetrical are reviewed, followed by their mathematical analysis. Also, this paper analyses multi-carrier based sinusoidal pulse width modulation (MC-SPWM) and multi-carrier based third-harmonic injected pulse width modulation (MC-THIPWM) techniques with phase-shifted (PS) and level-shifted (LS) carrier arrangements for the CHB-MLI. Moreover, a simulation study has been conducted using MATLAB Simulink to analyze the performance of MC-PWM techniques for the symmetrical and asymmetrical type CHB-MLIs. The 7-level and 9-level CHB-MLIs were evaluated for the stated MCPWM techniques in terms of harmonics and fundamental components. In addition, discharging current of all input sources was checked to verify the ability of all MC-PWM techniques to balance all input sources.","PeriodicalId":156864,"journal":{"name":"Journal of Engineering Research and Sciences","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122615652","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

Methodology for Learning Mathematics Based on Collaborative Work with the Support of ICT Tools and Virtual Environments of the UCN Campus UCN校园信息通信技术工具和虚拟环境支持下的协同学习数学方法

Journal of Engineering Research and Sciences Pub Date : 2022-04-01 DOI: 10.55708/js0104011

Carlos Huerta Briones

引用次数: 0

A Review on the Effect of Varied Sand Types in Concrete at High Temperature 高温下不同型砂对混凝土性能影响的研究进展

Journal of Engineering Research and Sciences Pub Date : 2022-04-01 DOI: 10.55708/js0104005

S. Hachemi, Z. Rahmouni

{"title":"A Review on the Effect of Varied Sand Types in Concrete at High Temperature","authors":"S. Hachemi, Z. Rahmouni","doi":"10.55708/js0104005","DOIUrl":"https://doi.org/10.55708/js0104005","url":null,"abstract":": In fact, aggregates in concrete generally occupied a considerable proportion of volume (60%-75%); sand constitutes about 30% to 50% of aggregates volume. It is well known that the nature of aggregates plays an important role on quality and properties of concrete. This suggests that the behavior of concrete exposed to high temperature is strongly linked to the nature and mineralogy of aggregates (coarse and fine aggregates). Furthermore, the description of the effect of high temperature on the components of concrete is intended to improve understanding of how concrete responds when it is exposed to elevated temperature. The fire performance of concrete depends on the thermal, physical and mechanical properties of its components. Sand can be classified into two groups according to its mineralogical nature: Siliceous and Calcareous, these two types of sand undergo different reactions when they are exposed to high temperature. Few studies have been published and showed that the nature of sand affects the concrete behavior at high temperature. This paper summaries the states-of-the-art studies on the mechanical and physical behavior of concrete made with different types of sand after being exposed to elevated temperature. It is revealed that the fire-response of concrete made with calcareous sand is different from that of concrete made with siliceous sand.","PeriodicalId":156864,"journal":{"name":"Journal of Engineering Research and Sciences","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125533889","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: 1

Evolutionary Learning of Fuzzy Rules and Application to Forecasting Environmental Impact on Plant Growth 模糊规则的进化学习及其在环境对植物生长影响预测中的应用

Journal of Engineering Research and Sciences Pub Date : 2022-04-01 DOI: 10.55708/js0104006

C. Nikolopoulos, Ryan Koralik

引用次数: 0

An Elaborate Breakdown of the Essentials of Biogas Production 沼气生产要素的详细分析

Journal of Engineering Research and Sciences Pub Date : 2022-04-01 DOI: 10.55708/js0104013

A. Abubakar, Kiman Silas, M. M. Aji

{"title":"An Elaborate Breakdown of the Essentials of Biogas Production","authors":"A. Abubakar, Kiman Silas, M. M. Aji","doi":"10.55708/js0104013","DOIUrl":"https://doi.org/10.55708/js0104013","url":null,"abstract":": World search for ways to properly manage rural and urban waste generated on daily basis from domestic and industrial buildings, perhaps leads to the adoption of the anaerobic digestion (AD) systems. The system utilizes microorganisms such as viruses, fungi, helminths, bacteria and protozoa to degrade waste so as to generate useful by-products such as biogas, used in heating, lighting and as fuel. Research on ways to effectively generate biogas from different feedstock had been serious in recent years, especially the study of the process kinetics to maximize production. This review seeks to provide details on feedstock type, pretreatment, substrate degradation, biogas properties, biogas utilization and factors influencing its production. Conclusion is drawn, noting that maximum biogas yield can only be obtained if the production parameters are carefully selected. Pressure being among the factors affecting the microclimate of digesters, is often uncontrolled in most biogas production facilities being slightly above the atmospheric pressure. Recent findings shows that biogas/methane amounts is increased with decreased internal gas pressure and could be a new efficient and effective process control strategy together with pH and temperature. This work will equip researchers and biogas plant developers with the rudiments of the technology which will eliminate the lack of technological know-how often experienced in some realms; in order to breach the gap in production and create a balance between waste generation, recycle and reuse.","PeriodicalId":156864,"journal":{"name":"Journal of Engineering Research and Sciences","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121495066","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: 1

System Identification of FIR Filters FIR滤波器的系统辨识

Journal of Engineering Research and Sciences Pub Date : 2022-04-01 DOI: 10.55708/js0104010

Sudheesh Kannur Vasudeva Rao, K. Kiran, N. Kumar, M. Mahadevaswamy

引用次数: 0

Human-Computer Interaction for Older Adults - a Literature Review on Technology Acceptance of eHealth Systems 老年人的人机交互——电子卫生系统技术接受的文献综述

Journal of Engineering Research and Sciences Pub Date : 2022-04-01 DOI: 10.55708/js0104014

Awais Ahmad, Peter Mozelius

{"title":"Human-Computer Interaction for Older Adults - a Literature Review on Technology Acceptance of eHealth Systems","authors":"Awais Ahmad, Peter Mozelius","doi":"10.55708/js0104014","DOIUrl":"https://doi.org/10.55708/js0104014","url":null,"abstract":": The population of older adults globally increased during the last couple of decades. Due to these demographic changes, the need for medical care has also significantly increased. Despite the age-related disabilities and chronic diseases, most older adults prefer independent living in their home environment. Technology-enhanced systems and eHealth applications seem to provide some p romising solutions for older adults’ well -being and independent living. However, the adoption and acceptance of these applications for older adults are unclear and further research is needed in this area. This study was carried out as a literature review, to meet the aim of identifying and discussing important factors in the Human-computer interaction of eHealth for older adults. The overall research question for this study was: What are the critical factors to consider for an improved human-computer interaction in technology-enhanced health care systems for older adults? Findings indicate some important factors to address: personal integrity, trust, technology acceptance, accessibility of ICT and eHealth literacy. If the presented factors are considered and addressed, it would be easier to achieve the desired aim of independent living. The authors recommend a human-computer interaction that is older adults centred, with the involvement of older adults users in the design process. Proper education and training on the use of eHealth services are also of great importance. Finally, the technology-enhanced system should also provide good social and technological support to the users.","PeriodicalId":156864,"journal":{"name":"Journal of Engineering Research and Sciences","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124909319","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: 4

Modelling and Comparative Study for Deep Groove Ball Bearing Based on Structural Analysis using FE Simulation 基于结构分析的深沟球轴承有限元模拟建模与对比研究

Journal of Engineering Research and Sciences Pub Date : 2022-04-01 DOI: 10.55708/js0104009

Avinash Galande, S. Pachpore, Ashish R. Pawar

引用次数: 0

Factors Determining Political Socialization in Young People (A Case of Pakistani University Students) 影响青年政治社会化的因素(以巴基斯坦大学生为例)

Journal of Engineering Research and Sciences Pub Date : 2022-04-01 DOI: 10.55708/js0104007

Salita Salita, Khoula Maryam

引用次数: 0