International Journal of Natural Sciences Research最新文献_第2页

Comparative Study of the Error Trend and Seasonal Exponential Smoothing and ARIMA Model using COVID-19 Death Rate in Nigeria 尼日利亚COVID-19死亡率误差趋势与季节指数平滑和ARIMA模型的比较研究

International Journal of Natural Sciences Research Pub Date : 2022-06-23 DOI: 10.18488/63.v10i1.3031

Samuel Olorunfemi Adams, Godwin Somto

{"title":"Comparative Study of the Error Trend and Seasonal Exponential Smoothing and ARIMA Model using COVID-19 Death Rate in Nigeria","authors":"Samuel Olorunfemi Adams, Godwin Somto","doi":"10.18488/63.v10i1.3031","DOIUrl":"https://doi.org/10.18488/63.v10i1.3031","url":null,"abstract":"In the last two years, COVID-19 had claimed millions of life in Nigeria and the world at large. It is an established global health emergency of our time and an ongoing threat faced by the world up till now. This study aims to determine the trend, fit an appropriate Error Trend and Seasonal (ETS) exponential smoothing and ARIMA model to the COVID-19 daily deaths in Nigeria. Dataset on the daily COVID-19 confirmed death cases were utilized in the study. The data was extracted from the Nigerian Centre for Disease Control (NCDC) online database from 10th July 2020 to 2nd December 2021. Autoregressive Integrated Moving Average (ARIMA) and twelve (12) (ETS) exponential smoothing techniques were compared based on the dataset. The performance of the ARIMA and ETS exponential smoothing methods was investigated using the Akaike Information Criterion (AIC), Bayesian Information Criterion (BIC), Hannan Quinn Information Criterion (HQC), and AMSE selection criteria. The best time series modeling for the coronavirus (COVID-19) epidemic in Nigeria was the ARIMA (0,1,0) because its model selection criteria showed that it had the lowest value of; AIC=2863.51, BIC= 2866.90, HQ = 2866.90, and AMSE = 0.55471. ARIMA (0,1,0) model is preferred among the thirteen (13) competing models based on daily confirmed deaths due to COVID-19 in Nigeria.","PeriodicalId":182680,"journal":{"name":"International Journal of Natural Sciences Research","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126231052","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

Microbial Assessment of Fura-Nunu Sold in Eiyenkorin, Kwara State, Nigeria 尼日利亚夸拉州Eiyenkorin销售的Fura-Nunu的微生物评估

International Journal of Natural Sciences Research Pub Date : 2022-05-23 DOI: 10.18488/63.v10i1.3000

Edem Ve, Abubakar Aw, Etukakpan Mn, el-Desouky Ai

{"title":"Microbial Assessment of Fura-Nunu Sold in Eiyenkorin, Kwara State, Nigeria","authors":"Edem Ve, Abubakar Aw, Etukakpan Mn, el-Desouky Ai","doi":"10.18488/63.v10i1.3000","DOIUrl":"https://doi.org/10.18488/63.v10i1.3000","url":null,"abstract":"Food-borne diseases are the global public health problems encountered as a result of consumption of contaminated foods. To this end, this study was designed to evaluate the microbial quality of fura-nunu sold in Eiyenkorin, Kwara State, Nigeria. Samples of fura-nunu were collected at different locations within Eiyenkorin and were transported to laboratory for analyses. Microbiological analyses were performed using standard methods. Data obtained from microbial counts were subjected to analysis of variance (ANOVA). Results of total heterotrophic bacteria count (THBC), total coliform count (TCC) and total fungal count (TFC) of fura-nunu indicated that THBC ranged from 1.6 ± 0.03 × 107 - 2.3 ± 0.01 × 107cfu/ml, TCC ranged from 2.5 ± 0.71 - 15.0 ± 1.41 cfu/100ml while TFC was between 4.0 ± 0.41 × 106 and 5.0 ± 5.58 ×107 cfu/g. There were significant differences (P<0.05) in THBC, TCC and TFC of fura-nunu samples. pH values ranged from 4.25 ± 0.31 – 5.30 ± 0.21. The identified bacteria with percentage occurrence (%) include; Lactobacillus spp. (14.81%), Staphylococcus aureus (12.96%), Escherichia coli (17.59%), Bacillus subtilis (6.48%), Pseudomonas aeruginosa (3.70%), Enterococcus spp. (8.33%), Micrococcus spp. (6.48%), Salmonella spp. (13.88%), Klebsiella spp. (4.62%) and Lactobacillus plantarium (11.11%). Fungi species and prevalence (%) were Aspergillus flavus (21.21%), Aspergillus niger (30.30%), Saccharomyces cerevisiae (16.66%), Penicillium spp. (12.12%) and Mucor spp. (19.69%). Results of handling and hygienic practices showed poor handling, storage and hygienic practices by fura-nunu vendors. Hence, there is need for proper education of the vendors on general food safety practices.","PeriodicalId":182680,"journal":{"name":"International Journal of Natural Sciences Research","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125915436","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

Ecological Footprint Evaluation for Environmental Sustainability in Ijebu Ode, Ogun State, Nigeria 尼日利亚奥贡州Ijebu Ode环境可持续性生态足迹评价

International Journal of Natural Sciences Research Pub Date : 2022-04-28 DOI: 10.18488/63.v10i1.2979

Edet Otto, H. Sawyerr, O. Opasola

{"title":"Ecological Footprint Evaluation for Environmental Sustainability in Ijebu Ode, Ogun State, Nigeria","authors":"Edet Otto, H. Sawyerr, O. Opasola","doi":"10.18488/63.v10i1.2979","DOIUrl":"https://doi.org/10.18488/63.v10i1.2979","url":null,"abstract":"The aim of this study was to evaluate the Ecological Footprint (EF) for Environmental Sustainability in Ijebu Ode. The study adopted a descriptive cross-sectional study design and the objectives were, to assess the average EF of Ijebu Ode. Both primary and secondary data were employed, and the primary data for this study was collected from four hundred (400) systemically sampled households through structured questionnaires, and analysed descriptively using the Statistical Package for Social Sciences (version 20.0). The findings revealed the average ecological footprint of the Ijebu Ode to be 0.3gha per capita, with the footprint of water as the highest contributor to the EF, with 0.9gha (86.5%) of the total footprint. Thus, the study concluded that, the average EF of Ijebu Ode is 0.3 gha and therefore sustainable. However, it was recommended that, sustainable consumption must be encouraged, implemented and demonstrated to sustain the current EF of Ijebu Ode and public campaigns should be encouraged and implemented adequately in light of increasing awareness of the adverse environmental impacts of unsustainable consumption.","PeriodicalId":182680,"journal":{"name":"International Journal of Natural Sciences Research","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116995460","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

A Strategy to Strengthen and Enhance the Telecommunication Network in Sri Lanka by Using Concepts of Graph Theory and Linear Programming Models 利用图论和线性规划模型的概念加强和提高斯里兰卡电信网络的战略

International Journal of Natural Sciences Research Pub Date : 2022-01-27 DOI: 10.18488/63.v10i1.2913

T. A. H. Dilpriya, G. Lanel, B. V. N. C. Vidanage

{"title":"A Strategy to Strengthen and Enhance the Telecommunication Network in Sri Lanka by Using Concepts of Graph Theory and Linear Programming Models","authors":"T. A. H. Dilpriya, G. Lanel, B. V. N. C. Vidanage","doi":"10.18488/63.v10i1.2913","DOIUrl":"https://doi.org/10.18488/63.v10i1.2913","url":null,"abstract":"The telecommunication sector in Sri Lanka is one of the most dynamic sectors, contributing significantly, both directly and indirectly, to investment, employment, productivity, and overall economic growth. According to the transformation of the telecommunication network of Sri Lanka, this study proposes a structure to increase the average upload and download speeds by using some concepts in pure Mathematics. The research design has aligned into two categories as interpretation and optimization. They established by using the concept of Graph Theory and linear programming models respective. We forecast the public switched telephone network (PSTN) model for the local network. Then we ranked carrier systems of Sri Lanka according to their services without violating privacy. Next, we created the minimum traffic flow, local model, based on the traffic flows. Then we proposed cable systems around Sri Lanka. After that, we calculated the required signal towers for the uniform coverage by considering the population density. Linear programming models had generated to optimize the traffic flows. We could obtain six hundred twenty-five linear programming models due to different coefficients in each case. So, we have separated those models into three sectors: low, moderate, and high. Three examples had discussed by considering them. The solutions had evaluated by using the PHP Simplex calculator.","PeriodicalId":182680,"journal":{"name":"International Journal of Natural Sciences Research","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121184201","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

Intelligent Systems for the Internet of Things: Essence, Perspectives and Problems 物联网智能系统:本质、观点和问题

International Journal of Natural Sciences Research Pub Date : 2021-11-04 DOI: 10.18488/journal.63.2021.91.17.25

S. Mahmudova

引用次数: 0

Study of Graphene-MoS2 Based SPR Biosensor with Graphene Based SPR Biosensor: Comparative Approach 石墨烯-二硫化钼基SPR生物传感器与石墨烯基SPR生物传感器的比较研究

International Journal of Natural Sciences Research Pub Date : 2019-03-29 DOI: 10.18488/journal.63.2019.71.1.9

Md. Mortuza Habib, Ruddro Roy, Md. Mojidul Islam, M. Hassan, Md. Muztahidul Islam, M. B. Hossain

{"title":"Study of Graphene-MoS2 Based SPR Biosensor with Graphene Based SPR Biosensor: Comparative Approach","authors":"Md. Mortuza Habib, Ruddro Roy, Md. Mojidul Islam, M. Hassan, Md. Muztahidul Islam, M. B. Hossain","doi":"10.18488/journal.63.2019.71.1.9","DOIUrl":"https://doi.org/10.18488/journal.63.2019.71.1.9","url":null,"abstract":"In this paper, we compare the sensitivity of graphene-MoS2 based surface plasmon resonance (SPR) biosensor to graphene based SPR biosensor. Here, graphene is used as biomolecular recognition element (BRE) because of its high adsorption ability and optical characteristics which helps to improve sensor sensitivity, on the other hand MoS2 is used for it has larger band gap, high fluroscence quenching ability, higher optical absorption efficiency which improves further sensor sensitivity. In DNA hybridization event, numerically achieved results show that single layer of graphene-MoS2 based SPR biosensor is 175% more sensitive than single layer of graphene coated SPR biosensor. Surface plasmon resonance angle and spectrum of reflected power are numerically investigated for different concentrated complementary DNA strands. The variations of SPR angle is significantly computable for complementary DNA strands whereas these parameters are varied negligibly for mismatched DNA strands. Thus the proposed sensor effectively differentiates hybridization and single nucleotide polymorphisms (SNP) by examining the level of changes in SPR angle and reflected power spectrum.","PeriodicalId":182680,"journal":{"name":"International Journal of Natural Sciences Research","volume":"152 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134585610","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: 6

Fuzzy Control of Hydrogen Generation by the Reaction of Activated Aluminum Particles and Water 活性铝颗粒与水反应制氢的模糊控制

International Journal of Natural Sciences Research Pub Date : 2017-01-10 DOI: 10.18488/journal.63/2017.5.1/63.1.1.7

Bui Trong Giap, K. Takahara, T. Kajiwara, K. Maekawa

{"title":"Fuzzy Control of Hydrogen Generation by the Reaction of Activated Aluminum Particles and Water","authors":"Bui Trong Giap, K. Takahara, T. Kajiwara, K. Maekawa","doi":"10.18488/journal.63/2017.5.1/63.1.1.7","DOIUrl":"https://doi.org/10.18488/journal.63/2017.5.1/63.1.1.7","url":null,"abstract":"The purpose of this paper is to design a fuzzy control system for generating hydrogen at a desired level by a reaction between water and activated aluminum particles. The activated aluminum particles are produced shredded aluminum sawdust. It is difficult to characterize the reaction quantitatively because the characteristics of hydrogen generating reaction vary as depending on the samples, the environment of the reaction and so on. The experimental system consists of a fuel cell (FC) of 100[W], a water tank, a reaction vessel, pressure sensors, a water pump, a radiator and a one-chip microcomputer. The fuzzy control system is designed to determine the quantum of water which is supplied to the activated aluminum particles. The error forms a desired value of the pressure of the reaction vessel and the change of the error are chosen as the labels of the fuzzy membership functions. The proposed fuzzy control system is applied to maintain the pressure of the reaction vessel of the developed hydrogen generation system at a certain level. The developed hydrogen generation system is confirmed to provide hydrogen to the FC by experiments under various conditions.","PeriodicalId":182680,"journal":{"name":"International Journal of Natural Sciences Research","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128036522","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

Introducing an Appropriate Geoportal Structure for Managing Wildlife Location Data 引入适当的地理门户结构来管理野生动物位置数据

International Journal of Natural Sciences Research Pub Date : 1900-01-01 DOI: 10.18488/JOURNAL.63.2019.71.32.48

Z. Mousavi, S. Behzadi

引用次数: 4

Geo-Portal Implementation with a Combined Approach of AHP and SWOT AHP与SWOT相结合的地理门户实现方法

International Journal of Natural Sciences Research Pub Date : 1900-01-01 DOI: 10.18488/journal.63.2019.71.22.31

Z. Mousavi, S. Behzadi

引用次数: 7

Optimization of the Total Annual Cost in Heat Exchanger Networks with Multiple Utilities 多电厂换热器网络年总成本的优化

International Journal of Natural Sciences Research Pub Date : 1900-01-01 DOI: 10.18488/journal.63.2021.91.1.11

E. Udochukwu, B. U. Ogbonnaya, O. Azeez

{"title":"Optimization of the Total Annual Cost in Heat Exchanger Networks with Multiple Utilities","authors":"E. Udochukwu, B. U. Ogbonnaya, O. Azeez","doi":"10.18488/journal.63.2021.91.1.11","DOIUrl":"https://doi.org/10.18488/journal.63.2021.91.1.11","url":null,"abstract":"This research work was focused on optimizing heat exchanger network problems from literature involving multiple utilities with the objective function of minimizing the Total Annual Costs of the designed networks. This was achieved through the use of pinch methodology on Aspen Pinch software, Version 11.1. Supertargeting was used to obtain the minimum temperature difference for two case studies and the networks were designed on Grid Diagrams. The design of the networks was focused on the energy-capital costs tradeoffs, preventing the use of extra heat exchanger units to reduce energy costs at the expense of capital costs. This paid off as the networks designed in this research obtained the lowest total annual costs (TACs) when compared with the results obtained by other researchers on the case studies under review. Contribution/Originality: This study contributes to the existing literature on problems involving multiple utilities and is able to achieve lower total annual costs through the optimization of the utilities usage using the combined traditional pinch technique and mathematical provisions as available in ASPEN pinch.","PeriodicalId":182680,"journal":{"name":"International Journal of Natural Sciences Research","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123698410","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