2021 Moratuwa Engineering Research Conference (MERCon)最新文献_第3页

The Effect of Deep Defects on the Efficiency Variation of CH3NH3PbI3 Perovskite Solar Cells 深度缺陷对CH3NH3PbI3钙钛矿太阳能电池效率变化的影响

2021 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2021-07-27 DOI: 10.1109/MERCon52712.2021.9525651

N. L. Adihetty, Dinuka R Ratnasinghe, Muthuthanthrige L. C. Attygalle, Som Narayan, P. Jha

{"title":"The Effect of Deep Defects on the Efficiency Variation of CH3NH3PbI3 Perovskite Solar Cells","authors":"N. L. Adihetty, Dinuka R Ratnasinghe, Muthuthanthrige L. C. Attygalle, Som Narayan, P. Jha","doi":"10.1109/MERCon52712.2021.9525651","DOIUrl":"https://doi.org/10.1109/MERCon52712.2021.9525651","url":null,"abstract":"Three-dimensional (3D) halide perovskites as CH3NH3PbI3 (3D-MAPI) have shown high performance in the perovskite solar cells. However, deep defects due to lattice disorders in the 3D halide perovskite cause to limit the performance of the halide perovskite solar cells. We have numerically simulated and investigated the optimum deep defect density of the 3D-MAPI layer of the p-i-n solar cell model with the structure of Glass/ITO(TCO)/PEDOT: PSS(HTM)/i-2D-MAPI/i-3D-MAPI/i-2D-MAPI/PCBM(ETM)/Ag. Due to the degradation of the organic components under some environmental conditions, the Pb-based organic perovskite solar cells need protective films. This 2D-3D-2D perovskite solar cell has been modeled as a stable perovskite solar cell, by inserting thin 2D-MAPI layers on both sides of the 3D-MAPI to reduce the degradation and moisture issues. Using SCAPS-1D solar cell simulation software, the deep defect density in the 3D halide perovskite layer was optimized to obtain the best performance of the cell model. Our simulation results have indicated that the deep defect density of the 3D-MAPI layer should not exceed 1012cm−3 for high performance. Also, low dark saturation current density and low Shockley-Read-Hall (SRH) recombination current density were observed at the low deep defect density in the 3D-MAPI layer.","PeriodicalId":6855,"journal":{"name":"2021 Moratuwa Engineering Research Conference (MERCon)","volume":"34 1","pages":"659-663"},"PeriodicalIF":0.0,"publicationDate":"2021-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80351243","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 Effectiveness of Capillary Barrier in Reduction of Rainfall Infiltration on a 15° Slope 15°坡面毛细屏障减少降雨入渗效果的研究

2021 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2021-07-27 DOI: 10.1109/MERCon52712.2021.9525742

E. Havisanth, S. Kulathilaka

引用次数: 1

An MILP-based Intra-firm Smart Resource Sharing Model 基于milp的企业内部智能资源共享模型

2021 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2021-07-27 DOI: 10.1109/MERCon52712.2021.9525729

I. Mahakalanda, R. D. S. Arunapriya

引用次数: 0

Optimization of Hemicellulose Recovery from Rice Straw for Biorefinery: Dilute Acid Pretreatment at Reduced Temperatures 生物精炼稻秆半纤维素回收工艺优化:低温稀酸预处理

2021 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2021-07-27 DOI: 10.1109/MERCon52712.2021.9525638

Poornima Wanninayake, M. Rathnayake, D. Thushara, S. Gunawardena

{"title":"Optimization of Hemicellulose Recovery from Rice Straw for Biorefinery: Dilute Acid Pretreatment at Reduced Temperatures","authors":"Poornima Wanninayake, M. Rathnayake, D. Thushara, S. Gunawardena","doi":"10.1109/MERCon52712.2021.9525638","DOIUrl":"https://doi.org/10.1109/MERCon52712.2021.9525638","url":null,"abstract":"Dilute sulfuric acid pretreatment was conducted to extract hemicellulose from rice straw at reduced temperatures (<100 °C), and the process was optimized using experimental design analysis with the response surface methodology. Fourier Transform Infrared Spectroscopy analysis was performed to verify the purity of recovered hemicellulose. Central composite design of experiments (DOE) was applied to develop a statistical model to identify the main effects and interaction effects of process parameters: acid concentration, reaction temperature, and reaction time. The proposed quadratic model showed a high adjusted determination coefficient (0.91) and Fischer's test value (22.4), indicating that the model is adequate to characterize the relationships among the process parameters and explain the variation observed in response. Acid concentration and reaction temperature have significant first order and quadratic effects on hemicellulose recovery. However, reaction time exhibited only a significant quadratic effect on hemicellulose recovery. The maximum hemicellulose yield (15.78%) was obtained at optimal conditions of 0.26 moldm−3 acid concentration, 98.1°C reaction temperature, and 30.48 min reaction time. In addition, residual analysis was carried out to check the adequacy of the proposed model.","PeriodicalId":6855,"journal":{"name":"2021 Moratuwa Engineering Research Conference (MERCon)","volume":"57 1","pages":"315-320"},"PeriodicalIF":0.0,"publicationDate":"2021-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72674425","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 Investigation of the Effect of Precipitate Size Distribution on Mechanical Properties of Aluminum 6063 Extrudates used for Window Frames 析出相粒径分布对6063铝合金窗框挤压件力学性能影响的研究

2021 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2021-07-27 DOI: 10.1109/MERCon52712.2021.9525649

Lwur Dilrukshi, G. De Silva

{"title":"An Investigation of the Effect of Precipitate Size Distribution on Mechanical Properties of Aluminum 6063 Extrudates used for Window Frames","authors":"Lwur Dilrukshi, G. De Silva","doi":"10.1109/MERCon52712.2021.9525649","DOIUrl":"https://doi.org/10.1109/MERCon52712.2021.9525649","url":null,"abstract":"This work focused on presenting an interpretation for the effect of precipitate size distribution on hardness and strength of the aluminum 6063 extrudates produced in local industry. The same heat treatment process applied in the local industry comprising solution treatment: keeping at 530°C for 4 hours, followed by age hardening treatment: keeping at 205°C for 150 minutes and air cooling, was carried out at laboratory scale. The average hardness and strength of heat-treated samples were measured as 66.5 HV and 210.5 MPa, respectively. Scanning Electron Microscopy - Energy Dispersive X-ray Spectroscopy (SEM/EDS) examination showed that secondary phase precipitates formed during this aging treatment belong to two types of precipitates, they are Silicon-Iron rich and Magnesium-Silicon-Iron rich precipitates. The average number of precipitates, precipitate size and area covered by precipitates were calculated by Image J software. Percentages of precipitates belong to three different size ranges were analyzed as 50.10 percent, 45.13 percent, and 4.77 percent for $0.0-0.2 mu mathrm{m}, 0.2-1.5 mu mathrm{m}$ and above $1.5 mu mathrm{m}$, respectively. The present work can be extended towards the development of a mathematical model to relate the ageing parameters and precipitate size distribution to hardness and strength of Al 6063 extrudates.","PeriodicalId":6855,"journal":{"name":"2021 Moratuwa Engineering Research Conference (MERCon)","volume":"80 1","pages":"676-680"},"PeriodicalIF":0.0,"publicationDate":"2021-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77364486","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

Investigation of the Effect of Solar Irradiation and Temperature on H. pluvialis Production in Photobioreactors Under Outdoor Cultivation in Sri Lanka 太阳辐照和温度对斯里兰卡室外栽培光生物反应器中雨芽孢菌生产影响的研究

2021 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2021-07-27 DOI: 10.1109/MERCon52712.2021.9525672

M.A.T.C . Perera, Kasun Muthunayaka, D. Madushanka, V. C. Liyanaarachchi, M. Premaratne, T. Ariyadasa

{"title":"Investigation of the Effect of Solar Irradiation and Temperature on H. pluvialis Production in Photobioreactors Under Outdoor Cultivation in Sri Lanka","authors":"M.A.T.C . Perera, Kasun Muthunayaka, D. Madushanka, V. C. Liyanaarachchi, M. Premaratne, T. Ariyadasa","doi":"10.1109/MERCon52712.2021.9525672","DOIUrl":"https://doi.org/10.1109/MERCon52712.2021.9525672","url":null,"abstract":"The complicated and varying weather conditions and contamination from fungi, protozoa, and bacteria are major problems associated with outdoor microalgae cultivation. In this study, outdoor microalgae cultivation was investigated in a 3.2 L vertical tubular photobioreactor in Moratuwa, Sri Lanka. During December, when both the solar irradiation and temperature were high, the water spray system in combination with two agro shading nets (each with a shading rate of 40-50%) could effectively reduce the temperature to $2 pm 2 {}^{0}mathrm{C}$ and control solar irradiation below 13500 lux. Under an initial biomass density of 0.2875 g/L and an atmospheric air flow rate of 1 vvm, Haematococcus pluvialis showcased a maximum biomass accumulation of 0.45 g/L and the maximum productivity of 20 mg/L/day. In addition, the reactor system and its design exhibited good performance, implying a potential scale-up opportunity. However, operation under outdoor conditions showed slightly poorer performance due to the light inhibition effect.","PeriodicalId":6855,"journal":{"name":"2021 Moratuwa Engineering Research Conference (MERCon)","volume":"1 1","pages":"327-332"},"PeriodicalIF":0.0,"publicationDate":"2021-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90899162","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 Modeling of Drying Behavior of Sri Lankan Kaolin 斯里兰卡高岭土干燥特性的数值模拟

2021 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2021-07-27 DOI: 10.1109/MERCon52712.2021.9525774

J. Jayaweera, M. Narayana, S. Adikary

{"title":"Numerical Modeling of Drying Behavior of Sri Lankan Kaolin","authors":"J. Jayaweera, M. Narayana, S. Adikary","doi":"10.1109/MERCon52712.2021.9525774","DOIUrl":"https://doi.org/10.1109/MERCon52712.2021.9525774","url":null,"abstract":"Drying process of green ceramic bodies are complicated due to simultaneous and coupled heat and mass transfers. Dimensional variations and mechanical stresses occur within the ceramic body during drying may create defects in the final product if drying conditions are not carefully controlled. In this study, the drying behavior of Sri Lankan Kaolin was investigated. Initially, Kaolin was characterized using wet chemical analysis and X-ray diffraction to investigate structure and composition. Two batches of Kaolin with different particle size distributions were prepared using wet ball mill grinding with average particles size (D50) of $4.07 mumathrm{m}$ and $3.57 mumathrm{m}$ respectively. Green ceramic samples were obtained using extrusion process. Samples were dried in oven at 60°C and moisture variation of the green product was measured with time. Critical moisture content of the Sri Lankan Kaolin was 1.50%. Mathematical relationship was formulated to determine drying behavior of Sri Lankan Kaolin. An unsteady three-dimensional (3D) model was developed and simulated in Computational Fluid Dynamics (CFD) framework. Simulation results developed by the model were compared with data obtained by experiments conducted using Sri Lankan Kaolin. The model results were validated and comply with experiments results and R2 value was 0.9.","PeriodicalId":6855,"journal":{"name":"2021 Moratuwa Engineering Research Conference (MERCon)","volume":"60 1","pages":"48-53"},"PeriodicalIF":0.0,"publicationDate":"2021-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88763730","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

Rare earth element potential in the beach placers along the southwest coast of Sri Lanka 斯里兰卡西南海岸沙滩砂矿的稀土元素潜力

2021 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2021-07-27 DOI: 10.1109/MERCon52712.2021.9525678

N. Batapola, N. Dushyantha, N. Ratnayake, R. Premasiri, B. Abeysinghe, O. Dissanayake, S. Rohitha, Saman Ilankoon, P. Dharmaratne

{"title":"Rare earth element potential in the beach placers along the southwest coast of Sri Lanka","authors":"N. Batapola, N. Dushyantha, N. Ratnayake, R. Premasiri, B. Abeysinghe, O. Dissanayake, S. Rohitha, Saman Ilankoon, P. Dharmaratne","doi":"10.1109/MERCon52712.2021.9525678","DOIUrl":"https://doi.org/10.1109/MERCon52712.2021.9525678","url":null,"abstract":"In the recent few years, rare earth elements (REEs) were considered as critical metals with strategic importance due to their high usage in modern technology and green energy applications. Currently, with the unexpected increase of rare earth element (REE) demand and China's market dominance, many REE processing projects are being launched or revived. In this regard, the present work is focused on assessing the REE potential in the beach placers along the southwest coastline in Sri Lanka. The collected 36 beach sand samples from the mean sea-level in the southwest coast during both southwestern and northeastern monsoons were subjected to both elemental and mineralogical analyses. Based on the findings, Galle, Ginthota, Wadduwa, and Thelwatta areas were found with significant contents of REEs ranging from 32.8-1,359.1 mg/kg. Moreover, the results suggest that REE-bearing heavy minerals are heavily concentrated in the beach face due to stronger oceanic currents generated by the strong winds of the southwestern monsoon along with the increased sediment supply by inland rivers. The findings in this study would provide insights for future REE prospecting studies, which is helpful in unraveling the hidden potential of REE resources in Sri Lankan beach placer deposits.","PeriodicalId":6855,"journal":{"name":"2021 Moratuwa Engineering Research Conference (MERCon)","volume":"74 1","pages":"415-420"},"PeriodicalIF":0.0,"publicationDate":"2021-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81624793","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

MERCon 2021 Committee

2021 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2021-07-27 DOI: 10.1109/mercon52712.2021.9525688

引用次数: 0

Development of Design Guidance for Circular Reinforced Concrete Columns Incorporating Crack Width 考虑裂缝宽度的钢筋混凝土圆形柱设计指南的编制

2021 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2021-07-27 DOI: 10.1109/MERCon52712.2021.9525676

G. C. S. Jayaweera, H. D. Hidallana-Gamage, W. P. R. Indrajith

{"title":"Development of Design Guidance for Circular Reinforced Concrete Columns Incorporating Crack Width","authors":"G. C. S. Jayaweera, H. D. Hidallana-Gamage, W. P. R. Indrajith","doi":"10.1109/MERCon52712.2021.9525676","DOIUrl":"https://doi.org/10.1109/MERCon52712.2021.9525676","url":null,"abstract":"Maximum crack width of reinforced concrete (RC) structures should be controlled for satisfying the serviceability and durability requirements of the structures. However, the crack width analysis of RC structures is not much easy because of the complexity of the parameters which affect the crack width. In the Sri Lankan context, there is no specific simplified guidance in terms charts and tables for crack width calculations of circular RC columns. Hence, it is important to develop such guidance. This research deals with the crack width analysis of circular RC columns in straight viaduct sections. A comprehensive study was carried out regarding the behaviour of the cracks in circular RC columns in viaduct sections as per the design standard, BS 5400. Autodesk Structural Bridge Design software was used to perform crack width calculations and MIDAS Civil software was used to do the Finite Element Analysis (FEA) and validation process. The comprehensive design charts developed in this research will be useful in calculating the crack widths in circular RC columns without following any time-consuming methods. Therefore, the findings of this research will be helpful to enhance the efficiency of the design work related to the crack width calculations of circular RC columns.","PeriodicalId":6855,"journal":{"name":"2021 Moratuwa Engineering Research Conference (MERCon)","volume":"163 1","pages":"148-153"},"PeriodicalIF":0.0,"publicationDate":"2021-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86422880","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