Cogent Engineering最新文献

{"title":"Modeling optical gap of cupric oxide nanomaterial semiconductor using hybrid intelligent method","authors":"Abdullah Alqahtani","doi":"10.1080/23311916.2023.2283287","DOIUrl":"https://doi.org/10.1080/23311916.2023.2283287","url":null,"abstract":"Abstract Copper II oxide (CuO) semiconductor belongs to the compound of metal oxide with abundant uniqueness and features which facilitate its wider applicability. The nature of the optical band gap of this semiconductor strengthens its usage for many technological and industrial applications while chemical doping mechanisms through breaking of symmetry of the host semiconductor have proven successful for its energy gap tuning for meeting the desired demand. This work proposes hybrid particle swarm optimization-based support vector regression (PBSVR) as an effective intelligent algorithm for determining optical band gap using lattice parameters (distorted) as input predictors. The developed PBSVR model demonstrates low mean absolute error (MAE) of 0.287 eV, low root mean square error (RMSE) of 0.367 eV and high correlation coefficient (CC) of 90.3 % while validating on testing samples. PBSVR model performs better than three existing models in the literature which include stepwise regression model (SWR), extreme learning machine model with sigmoid function (ELM-IP-Sig) and sine function (ELM-IP-Sine). On the basis of MAE, the developed PBSVR model outperforms ELM-IP-Sig, ELM-IP-Sine and SWR models with performance improvement of 33.7%, 26.93% and 67.6%, respectively. The PBSVR model further investigates the influence of iron and aluminum on the semiconductor energy gap while the predicted optical band gaps agree excellently with the experimental optical gaps. The experimental stress circumvention potentials of the developed PBSVR model coupled with its superior performance over the existing models are of great importance in ensuring precise and quick characterization of CuO optical gap for desired applications.","PeriodicalId":10464,"journal":{"name":"Cogent Engineering","volume":"214 ","pages":""},"PeriodicalIF":1.9,"publicationDate":"2023-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139251242","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}

{"title":"Study of welding parameters’ effects on residual stress and hardness in 316 stainless steel pipes: Experimental and analytical investigations","authors":"Haider Maath Mohammad, Usama J. Naeem, Nuha Hadi Jasim Al Hasan","doi":"10.1080/23311916.2023.2283343","DOIUrl":"https://doi.org/10.1080/23311916.2023.2283343","url":null,"abstract":"Abstract During service, residual stresses are generated as a result of plastic deformation induced by mechanical loads, thermal loads, or variations in the applied welding. Despite extensive research on welding processes, there remains a significant gap in understanding the combined effects of different welding parameters on the residual stresses and hardness of welded 316 stainless steel pipes. This study addresses this gap by systematically examining parameters of welding currents (90, 100, 110, 120, 140, and 160A), metal wire types (6010, 6013, and 7018), and wire diameters (3.2 and 2.25 mm), to provide a comprehensive analysis of their impact on mechanical properties. As part of the experimental work, arc welding, hardness tests, and X-ray diffraction tests were conducted. In different welding conditions, residual stresses increase as the hardness decreases, according to theoretical calculations based on X-ray diffraction analysis. It is observed that as residual stresses increase, hardness levels decrease, providing valuable insight into the relationship between these factors. In this systematic investigation, existing knowledge is extended.","PeriodicalId":10464,"journal":{"name":"Cogent Engineering","volume":"128 5","pages":""},"PeriodicalIF":1.9,"publicationDate":"2023-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139252657","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}

{"title":"Assessment of shear strength characteristics of the unsaturated gypseous soil at various saturation degrees","authors":"Ahmed Salah Abood, Mohammed Y. Fattah, Aqeel Al-Adili","doi":"10.1080/23311916.2023.2283303","DOIUrl":"https://doi.org/10.1080/23311916.2023.2283303","url":null,"abstract":"Abstract The purpose of this study is to determine whether or not unsaturated gypseous soil can function well as a substrate for the foundations of carrying loads. A comprehensive program of testing was carried out with the objective of validating the geotechnical parameters and behavior of the unsaturated gypseous soils. The testing program included specific gravity, moisture content, classification tests, Proctor’s compaction, relative density, and the triaxial test. Additionally, chemical analysis was performed on the samples as well. This approach was employed in a granular soil suction process to eliminate gaps of air in the soil until the soil grains held together. The sample was prepared by using a pump of vacuum with a suction process (approximately −20.0 kPa), and this method was used in the granular soil suction process. As a consequence of this, the suction prevents a specimen from collapsing when it is removed from the apparatus. The next step consisted of conducting a consolidated-undrained triaxial test on the soil. Experiments were performed on materials with a relative density of 35% and several degrees of saturation, such as normal saturation (6%), unsaturated (30, 60, 80%), and 100% saturated. It was shown that there is a reduction in the internal friction angle for the effective and total stresses is caused by an increase in the water content of the soil at any saturation degree. This occurs in both the unsaturated and saturated states of the soil. The angle of friction decreased by 80% of the natural value for both stresses, effective and total. As gypseous soil moisture increases up to the saturation degree of 60%, the soil cohesion for the total and effective stresses rises, where it increased by (220% and 125%) of the natural value for both the effective stress and the total stress, respectively, leading to an increase in the soil’s shear strength (ϕ and c). After then, there was a steady weakening of the force when it reached saturation degrees of 80% and 100%, where it decreased by (44% and 47%) of the maximum value at 60% saturation degree for both the effective stress and the total stress, respectively.","PeriodicalId":10464,"journal":{"name":"Cogent Engineering","volume":"62 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2023-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139258878","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}

{"title":"A user-friendly Bees Algorithm for continuous and combinatorial optimisation","authors":"A. H. Ismail, Wegie Ruslan, D. Pham","doi":"10.1080/23311916.2023.2278257","DOIUrl":"https://doi.org/10.1080/23311916.2023.2278257","url":null,"abstract":"Abstract This paper introduces a new variant of the Bees Algorithm (BA) called Bees Algorithm with 2-parameter (BA2), which is a population-based metaheuristic algorithm designed to solve continuous and combinatorial optimisation problems. The proposed algorithm simplified the BA’s parameters by combining exploration and exploitation strategies while preserving the algorithm’s core principles to efficiently search for optimal solutions. The paper provides a detailed description of the algorithm’s core principles and its application to two engineering problems, the air-cooling system design (ACSD) and the printed circuit board assembly sequence optimisation (PASO). The results show that BA2 outperforms previous versions of the basic BA in terms of convergence speed and solution quality. However, the authors acknowledge that further research is needed to test the scalability and generalisability of the algorithm to larger and more diverse optimisation problems. Overall, this paper provides valuable insights into the potential of metaheuristics for solving real-world optimisation problems.","PeriodicalId":10464,"journal":{"name":"Cogent Engineering","volume":"4 4","pages":""},"PeriodicalIF":1.9,"publicationDate":"2023-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139257352","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}

{"title":"Optimal fault resilient autonomous quadcopter control based on dynamic partial reconfigurable FPGA","authors":"Harish S. Bhat, Shreesha Chokkadi, Satish Shenoy","doi":"10.1080/23311916.2023.2276503","DOIUrl":"https://doi.org/10.1080/23311916.2023.2276503","url":null,"abstract":"Abstract Quadcopters are in enormous demand in mission-critical applications where there is a large risk to human life, such as border patrolling, emergency rescue, and production monitoring in chemical industries. Autonomously flying quadcopters can ensure higher levels of safety than remotely controlled quadcopters. Due to the complexity of autonomous quadcopters, there is a risk of failure, posing an enormous challenge to successful mission completion. Additionally, due to space constraints and the need for extended operation, the controller area and propulsion power are to be lower along with higher speeds of tracking for reaching the destination as early as possible. With these conflicting requirements, these metrics can be optimized in stages by reconfiguring the controllers on FPGA-based systems. Different controllers and suitable references are chosen and brought into action based on the metric that is lagging once they are found suitable to operate safely. This combination of control and reference reconfiguration and switching of main/auxiliary controllers is expected to ensure speed, area, and power optimization with improved fault resilience, ensuring better mission completion possibilities. This has been verified with Simulink-based algorithms of both continuous systems and fixed point-based digital systems and FPGA-based system co-simulation with the Simulink-based quadcopter model. Finally, the synthesis and implementation of the FPGA-based system is also taken up on Zynq Ultrascale±based devices with Vivado v2018.3-based IDE.","PeriodicalId":10464,"journal":{"name":"Cogent Engineering","volume":"40 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2023-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139259475","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}

{"title":"Review on electronic waste used as construction materials - a scientometric analysis","authors":"M. Vishnupriyan, R. Annadurai, K. Onyelowe, Nakkeeran Ganasen","doi":"10.1080/23311916.2023.2283307","DOIUrl":"https://doi.org/10.1080/23311916.2023.2283307","url":null,"abstract":"Abstract Concrete, a widely used building material, should minimize its environmental impact to align with the construction sector’s Sustainable Development Goals. Researchers worldwide are investigating the possibility of e-waste in building materials incorporating various recyclable elements. This paper conducts a thorough review of research on e-waste as a building material. Various E-waste products are used as fine and coarse aggregate replacements in concrete. The study uses a bibliographic approach with the Scopus database to delve into the literature discussing E-waste in construction materials from 2007 to 2022. Data are extracted specifically from Scopus, which identifies 731 papers based on the keyword “Electronic waste used as building materials”. The second step involves scientometric analysis, which focuses on patterns within the articles, such as the most prolific countries, sources, frequently used keywords, and reports containing relevant research. Each research phase contains a summary of the results obtained at various stages. Detailed quantitative and qualitative discussions are also conducted to achieve the three primary goals: a summary of quantitative data, a discussion of the existing application, and identifying future research directions. These findings will be useful for subsequent academic studies on transforming e-waste into building materials. The scientometric review provides a path for researchers from various countries to share new ideas and information while encouraging research collaboration.","PeriodicalId":10464,"journal":{"name":"Cogent Engineering","volume":"145 11","pages":""},"PeriodicalIF":1.9,"publicationDate":"2023-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139260885","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}

{"title":"Statistical analysis of storage capacity increment effect in micro-grid management with simultaneous use of reconfiguration and unit commitment","authors":"Behzad Ehsan-Maleki, Hamid Ghafi, Morteza Azimi Nasab, Mohammad Zand, P. Sanjeevikumar, Baseem Khan","doi":"10.1080/23311916.2023.2280290","DOIUrl":"https://doi.org/10.1080/23311916.2023.2280290","url":null,"abstract":"Abstract This paper aims to provide a model that combines reconfiguration with Unit Commitment (UC) and analytically examine Storage Capacity Increment Effects (SCIEs) in Micro-Grid (MG) operation. The case study includes batteries as the storage system and a conventional 10-bus MG with Wind Turbine (WT) and Micro-Turbines (MTs) as energy sources. The load demand and energy estimation of the Wind Unit (WU) with respect to wind speed changes are considered uncertain parameters. Additionally, a newly introduced algorithm and an objective function based on MG’s day-ahead benefit are employed to tackle the problem. According to Monte Carlo Simulation (MCS), a few scenarios are created for modeling uncertainties, and the MG’s optimal operation is examined under these situations. This study is based on two cases: the first examines the MG’s scheme with just one battery, and the second investigate SCIEs. This paper seeks to maximize MG’s benefit and optimize power exchange with increasing storage capacity. The statistical analysis results show that the proposed strategy can offer more cost-effectiveness, reliability, and power quality, though challenges remain.","PeriodicalId":10464,"journal":{"name":"Cogent Engineering","volume":"64 17","pages":""},"PeriodicalIF":1.9,"publicationDate":"2023-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139275666","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}

{"title":"A new Bell-exponential model: Properties and applications","authors":"M. Imran, H. Bakouch, M. Tahir, Muhammad Ameeq, Farrukh Jamal, John T. Mendy","doi":"10.1080/23311916.2023.2281062","DOIUrl":"https://doi.org/10.1080/23311916.2023.2281062","url":null,"abstract":"Abstract In this paper, we propose a tractable Kumaraswamy Bell exponential (KwBE) distribution as a submodel of the Kumaraswamy Bell-G family of distributions. Several well-established properties are obtained for the KwBE distribution, such as the linear functional representation, $r$rth moment, incomplete moment, moment generating function using Wright generalized hyper-geometric function, conditional moment and Réyni entropy. Based on the KwBE model, a group acceptance sampling plan (GASP) for the truncated life test is presented using median life as a quality index. Moreover, the essential design parameters are derived by defining the consumer risk and the test termination duration. The comparative study of GASP with ordinary sampling plan (OSP) is performed. A simulation study is performed to highlight the behavior of the estimates. On the inferential side, the associated parameters are estimated using a well-established maximum likelihood estimation method. The detailed model’s comparison analysis, graphical as well as numerical evidence to real-data applications, supports the theoretical work.","PeriodicalId":10464,"journal":{"name":"Cogent Engineering","volume":"67 1","pages":""},"PeriodicalIF":1.9,"publicationDate":"2023-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139274672","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}

{"title":"Test case generation and history data analysis during optimization in regression testing: An NLP study","authors":"Atulya Gupta, Rajendra Prasad Mahapatra","doi":"10.1080/23311916.2023.2276495","DOIUrl":"https://doi.org/10.1080/23311916.2023.2276495","url":null,"abstract":"The generation of test cases to verify and validate the actions of software or an application, as per the customers’ requirements, is an indispensable activity in software industries. A tester could construct test cases to suffice various objectives, which could be random or task-oriented at times. Most of the time, test cases are generated based on clients’ specifications or requirements. These requirements are structured in natural language, and manual derivation of test cases from such client-stated requirements could be a cumbersome and time-absorbing activity for testers. Until recently, many practitioners have proposed a natural language processing (NLP)-oriented solution to automate or semi-automate the manual process of generating test cases from requirements; nevertheless, such studies imposed a restriction on how the clients should document or represent their requirements. This study, on the contrary, suggested an NLP solution that considers free-format user requirements and applies text pre-processing, a combination of dependency parser and RAKE process, along with a statistical similarity measure and template-based natural language generation (NLG) to translate them into detailed test cases. Apart from test case generation, with the aid of NLP tactics, this study has also proposed a solution for encoding the historical data of test cases into numerical values. Such numerical scores serve as valuable data and create the proper insight for testers during test case optimization.","PeriodicalId":10464,"journal":{"name":"Cogent Engineering","volume":"25 6","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135038311","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}

{"title":"Experimental investigation of mechanical properties and morphology of bamboo-glass fiber-nanoclay reinforced epoxy hybrid composites","authors":"Syed Mansoor Ahmad, Gowrishankar M C, Manjunath Shettar, Sathyashankara Sharma","doi":"10.1080/23311916.2023.2279209","DOIUrl":"https://doi.org/10.1080/23311916.2023.2279209","url":null,"abstract":"In the present work, the mechanical and morphological characterization of bamboo-glass fiber-nanoclay epoxy hybrid composites is carried out. Materials are prepared using a hand lay-up process with different wt.% of bamboo fiber, glass fiber, nanoclay, and epoxy. As per ASTM standards, fabricated composite laminates are cut and tested for tensile and flexural properties. The bamboo fiber epoxy composites (BFEC) display the tensile and flexural strength of 137 and 170 MPa, respectively. Hybrid composites, viz. bamboo-glass fibers epoxy composites (BGFEC), display improved tensile (180–240 MPa) and flexural (225 to 320 MPa) strengths compared to BFECs. Glass fiber epoxy composites (GFEC) display maximum tensile (265 MPa) and flexural (360 MPa) strengths among all the composites. Furthermore, the addition of nanoclay improves the tensile (by 6 to 8%) and flexural (by 8 to 10%) strengths of epoxy, BFEC, BGFEC, and GFECs. SEM analysis is conducted for fractured tensile specimens to understand the reasons for specimen failure.","PeriodicalId":10464,"journal":{"name":"Cogent Engineering","volume":"26 12","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135038303","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}