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Journal of the National Science Foundation of Sri Lanka最新文献

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Assessment of marine turtle nesting habitats from Tangalle to the Kumbukkan Oya estuary in south-eastern Sri Lanka 斯里兰卡东南部Tangalle至Kumbukkan Oya河口海龟筑巢栖息地评估
IF 0.5 4区 综合性期刊 Q4 MULTIDISCIPLINARY SCIENCES
Journal of the National Science Foundation of Sri Lanka
Pub Date : 2022-12-31 DOI: 10.4038/jnsfsr.v50i4.10674
SJ Perera, W. Perera, S. Goonatilake, K. Ekaratne, D. Wijesinghe, LV Perera, D. Chandranimal, A. Ediriweera
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引用次数: 0
Empiricism and non-empirical research 经验主义和非经验研究
IF 0.5 4区 综合性期刊 Q4 MULTIDISCIPLINARY SCIENCES
Journal of the National Science Foundation of Sri Lanka
Pub Date : 2022-12-31 DOI: 10.4038/jnsfsr.v50i4.11580
A. Abeysekera
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引用次数: 0
Anomalous propagation pathway of the Sri Lanka Dome in summer 2014 2014年夏季斯里兰卡巨蛋的异常传播路径
IF 0.5 4区 综合性期刊 Q4 MULTIDISCIPLINARY SCIENCES
Journal of the National Science Foundation of Sri Lanka
Pub Date : 2022-12-31 DOI: 10.4038/jnsfsr.v50i4.10636
G. Pathirana, G. Chen, D. Wang, MK Abeyratne, T. Priyadarshana
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引用次数: 0
Synthesis of polyethylene glycol-grafted graphite and effect of its loading on properties of natural rubber composites 聚乙二醇接枝石墨的合成及其负载对天然橡胶复合材料性能的影响
IF 0.5 4区 综合性期刊 Q4 MULTIDISCIPLINARY SCIENCES
Journal of the National Science Foundation of Sri Lanka
Pub Date : 2022-12-31 DOI: 10.4038/jnsfsr.v50i4.10902
W. Sampath, Candida E. C. Fernando, D. Edirisinghe
{"title":"Synthesis of polyethylene glycol-grafted graphite and effect of its loading on properties of natural rubber composites","authors":"W. Sampath, Candida E. C. Fernando, D. Edirisinghe","doi":"10.4038/jnsfsr.v50i4.10902","DOIUrl":"https://doi.org/10.4038/jnsfsr.v50i4.10902","url":null,"abstract":"","PeriodicalId":17429,"journal":{"name":"Journal of the National Science Foundation of Sri Lanka","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44626408","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A new multivariate transmuted family of distributions: theory and application for modelling of daily world COVID-19 cases 一种新的多变量变换分布族:全球日常COVID-19病例建模的理论与应用
IF 0.5 4区 综合性期刊 Q4 MULTIDISCIPLINARY SCIENCES
Journal of the National Science Foundation of Sri Lanka
Pub Date : 2022-12-31 DOI: 10.4038/jnsfsr.v50i4.10621
Jaser Darwish, LI Al-Turk, MQ Shahbaz
Multivariate distributions are helpful in the simultaneous modeling of several dependent random variables. The development of a unique multivariate distribution has been a difficult task and different multivariate versions of the same distribution are available. The need is, therefore, to suggest a method of obtaining a multivariate distribution from the univariate marginals. In this paper, we have proposed a new method of generating the multivariate families of distributions when information on univariate marginals is available. Specifically, we have proposed a multivariate family of distributions which provides a univariate transmuted family of distributions as marginal. The proposed family is a re-parameterization of the Cambanis (1977) family. Some properties of the proposed family of distributions have been studied. These properties include marginal and joint marginal distributions, conditional distributions, and marginal and conditional moments. We have also obtained the dependence measures alongside the maximum likelihood estimation of the parameters. The proposed multivariate family of distributions is studied for the Weibull baseline distributions giving rise to the multivariate transmuted Weibull (MTW) distribution. Real data application of the proposed MTW distribution is given in the context of modeling the daily COVID-19 cases of the World. It is observed that the proposed MTW distribution is a suitable fit for the joint modeling of the COVID-19 data. © 2022, National Science Foundation. All rights reserved.
多变量分布有助于同时对几个因变量进行建模。开发独特的多变量分布一直是一项艰巨的任务，并且可以获得相同分布的不同多变量版本。因此，需要提出一种从单变量边际获得多变量分布的方法。在本文中，我们提出了一种在单变量边际信息可用的情况下生成多变量分布族的新方法。具体地说，我们提出了一个多变量分布族，它提供了一个单变量转化的边际分布族。提议的家族是对Cambanis（1977）家族的重新参数化。研究了所提出的分布族的一些性质。这些性质包括边际和联合边际分布、条件分布以及边际和条件矩。我们还获得了参数的依赖性度量和最大似然估计。研究了所提出的多变量分布族的威布尔基线分布，产生了多变量转换威布尔（MTW）分布。在对世界每日新冠肺炎病例建模的背景下，给出了拟议MTW分布的真实数据应用。据观察，所提出的MTW分布适合于新冠肺炎数据的联合建模。©2022，国家科学基金会。保留所有权利。
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引用次数: 0
Designing a closed-loop information flow model in bridging the market information gap among agriculture stakeholders in Sri Lanka 设计闭环信息流模型，弥合斯里兰卡农业利益相关者之间的市场信息差距
IF 0.5 4区 综合性期刊 Q4 MULTIDISCIPLINARY SCIENCES
Journal of the National Science Foundation of Sri Lanka
Pub Date : 2022-12-31 DOI: 10.4038/jnsfsr.v50i4.10418
T. B. Mallikaarachchi, G. Samaraweera, A. Walisadeera, L. De Silva, S. Munasinghe
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引用次数: 0
Developing a model to predict the propagation of sulphide stress corrosion of steel used for petroleum pipelines 建立了石油管道用钢硫化物应力腐蚀扩展预测模型
IF 0.5 4区 综合性期刊 Q4 MULTIDISCIPLINARY SCIENCES
Journal of the National Science Foundation of Sri Lanka
Pub Date : 2022-12-31 DOI: 10.4038/jnsfsr.v50i4.10586
A. Manimendra, I. de Silva, R. Jayasundara
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引用次数: 0
Simulation of coloured particles radiation spectra from black holes 黑洞彩色粒子辐射光谱的模拟
IF 0.5 4区 综合性期刊 Q4 MULTIDISCIPLINARY SCIENCES
Journal of the National Science Foundation of Sri Lanka
Pub Date : 2022-12-31 DOI: 10.4038/jnsfsr.v50i4.10608
Cnt Wijewardhana, K. Gamalath
{"title":"Simulation of coloured particles radiation spectra from black holes","authors":"Cnt Wijewardhana, K. Gamalath","doi":"10.4038/jnsfsr.v50i4.10608","DOIUrl":"https://doi.org/10.4038/jnsfsr.v50i4.10608","url":null,"abstract":"","PeriodicalId":17429,"journal":{"name":"Journal of the National Science Foundation of Sri Lanka","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46611017","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Analysis of instantaneous, daily and monthly statistics 2017-2021 of rooftop solar energy 2017-2021年屋顶太阳能瞬时、日、月统计分析
IF 0.5 4区 综合性期刊 Q4 MULTIDISCIPLINARY SCIENCES
Journal of the National Science Foundation of Sri Lanka
Pub Date : 2022-12-31 DOI: 10.4038/jnsfsr.v50i4.11079
JR Lucas
{"title":"Analysis of instantaneous, daily and monthly statistics 2017-2021 of rooftop solar energy","authors":"JR Lucas","doi":"10.4038/jnsfsr.v50i4.11079","DOIUrl":"https://doi.org/10.4038/jnsfsr.v50i4.11079","url":null,"abstract":"","PeriodicalId":17429,"journal":{"name":"Journal of the National Science Foundation of Sri Lanka","volume":" ","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49302244","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Investigation of oil level and type of solid insulator on creeping discharges propagating under an ac electric field 交流电场作用下蠕变放电的油位和固体绝缘子类型研究
IF 0.5 4区 综合性期刊 Q4 MULTIDISCIPLINARY SCIENCES
Journal of the National Science Foundation of Sri Lanka
Pub Date : 2022-12-31 DOI: 10.4038/jnsfsr.v50i4.10641
S. Ediriweera, P.B. Jayarathna, R. Samarasinghe, R. Lucas
{"title":"Investigation of oil level and type of solid insulator on creeping discharges propagating under an ac electric field","authors":"S. Ediriweera, P.B. Jayarathna, R. Samarasinghe, R. Lucas","doi":"10.4038/jnsfsr.v50i4.10641","DOIUrl":"https://doi.org/10.4038/jnsfsr.v50i4.10641","url":null,"abstract":"","PeriodicalId":17429,"journal":{"name":"Journal of the National Science Foundation of Sri Lanka","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41469349","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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