Journal of the Nigerian Society of Physical Sciences最新文献_第2页

Stagnation point flow of viscous nanofluid towards a shrinking sheet with quadratic buoyancy and thermophoresis influence: convection through porous media 受二次浮力和热泳影响的粘性纳米流体向收缩片的滞留点流动：多孔介质对流

Journal of the Nigerian Society of Physical Sciences Pub Date : 2024-07-07 DOI: 10.46481/jnsps.2024.1970

Ademola Agunbiade, Usman Abubakar, T. Oyekunle, M. Akolade

{"title":"Stagnation point flow of viscous nanofluid towards a shrinking sheet with quadratic buoyancy and thermophoresis influence: convection through porous media","authors":"Ademola Agunbiade, Usman Abubakar, T. Oyekunle, M. Akolade","doi":"10.46481/jnsps.2024.1970","DOIUrl":"https://doi.org/10.46481/jnsps.2024.1970","url":null,"abstract":"This study investigates the dynamics of heat and mass transfer, focusing on the impact of nonlinear convection and thermophoresis in the flow of viscous nanofluid towards a shrinking sheet embedded with a porous matrix. To facilitate understanding of the flow behavior, the study employs similarity variables to simplify the resulting nonlinear partial differential equations. Numerical analysis utilizing the collocation method with Legendre polynomials as basis functions reveals distinct distributions of velocity, temperature, and concentration. The results demonstrate that the dimensionless suction coefficient amplifies nanoparticle volume fraction and momentum along the stretching surface. In addition, an increase in internal frictional force leads to heightened injection of heat energy, accelerates the temperature field, and impedes nanoparticle diffusion due to heat absorption. Elevation of convection terms augments momentum, reduces energy dispersion, and enhances nanoparticle diffusion. Moreover, an increase in the dimensionless Eckert number (Ec) correlates with intensified energy and diminished diffusion concentration of the nanoparticle volume fraction.","PeriodicalId":342917,"journal":{"name":"Journal of the Nigerian Society of Physical Sciences","volume":" 92","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141670817","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

Identifying heterogeneity for increasing the prediction accuracy of machine learning models 识别异质性以提高机器学习模型的预测准确性

Journal of the Nigerian Society of Physical Sciences Pub Date : 2024-06-16 DOI: 10.46481/jnsps.2024.2058

Paavithashnee Ravi Kumar, Majid Khan Majahar Ali, O. Ibidoja

{"title":"Identifying heterogeneity for increasing the prediction accuracy of machine learning models","authors":"Paavithashnee Ravi Kumar, Majid Khan Majahar Ali, O. Ibidoja","doi":"10.46481/jnsps.2024.2058","DOIUrl":"https://doi.org/10.46481/jnsps.2024.2058","url":null,"abstract":"In recent years, the significance of machine learning in agriculture has surged, particularly in post-harvest monitoring for sustainable aquaculture. Challenges like heterogeneity, irrelevant variables and multicollinearity hinder the implementation of smart monitoring systems. However, this study focuses on investigating heterogeneity among drying parameters that determine the moisture content removal during seaweed drying due to its limited attention, particularly within the field of agriculture. Additionally, a heterogeneity model within machine learning algorithms is proposed to enhance accuracy in predicting seaweed moisture content removal, both before and after the removal of heterogeneity parameters and also after the inclusion of single-eliminated heterogeneity parameters. The dataset consists of 1914 observations with 29 independent variables, but this study narrows down to five: Temperature (T1, T4, T7), Humidity (H5), and Solar Radiation (PY). These variables are interacted up to second-order interactions, resulting in 55 variables. Variance inflation factor and boxplots are employed to identify heterogeneity parameters. Two predictive machine learning models, namely random forest and elastic net are then utilized to identify the 15 and 20 highest important parameters for seaweed moisture content removal. Evaluation metrics (MSE, SSE, MAPE, and R-squared) are used to assess model performance. Results demonstrate that the random forest model outperforms the elastic net model in terms of higher accuracy and lower error, both before and after removing heterogeneity parameters, and even after reintroducing single-eliminated heterogeneity parameters. Notably, the random forest model exhibits higher accuracy before excluding heterogeneity parameters.","PeriodicalId":342917,"journal":{"name":"Journal of the Nigerian Society of Physical Sciences","volume":"5 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141336059","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

Throughflow effect on bi-disperse convection in Rivlin-Ericksen fluid 里夫林-埃里克森流体中双分散对流的通流效应

Journal of the Nigerian Society of Physical Sciences Pub Date : 2024-06-04 DOI: 10.46481/jnsps.2024.2052

P. Sharma, Deepak Bains Sharma, Dr Pankaj Thakur

引用次数: 0

The dynamics of hybrid-immune and immunodeficient susceptible individuals and the three stages of COVID-19 vaccination 混合免疫和免疫缺陷易感个体的动态变化以及 COVID-19 疫苗接种的三个阶段

Journal of the Nigerian Society of Physical Sciences Pub Date : 2024-06-04 DOI: 10.46481/jnsps.2024.2001

E. A. Nwaibeh, M. K. M. Ali, M. O. Adewole

{"title":"The dynamics of hybrid-immune and immunodeficient susceptible individuals and the three stages of COVID-19 vaccination","authors":"E. A. Nwaibeh, M. K. M. Ali, M. O. Adewole","doi":"10.46481/jnsps.2024.2001","DOIUrl":"https://doi.org/10.46481/jnsps.2024.2001","url":null,"abstract":"The World Health Organization has disclosed that the hybrid-immune and immunodeficient individuals are two distinct classes of individuals susceptible to the COVID-19 virus. To model this unique characteristics of two distinct categories of susceptible individuals and the dynamics of the three phases of a vaccination program implemented by the World Health Organization in Malaysia, which have not been accounted for in previous studies, a twelve compartmental SSVEIHQR-D epidemiological model was developed. This model aimed to accurately capture the spread of the COVID-19 virus by fitting real-life data to the model and obtaining updated estimates of the reproduction number. The study also focused on assessing current control measures and exploring strategies to eradicate the virus and mitigate future outbreaks. Mathematical analyses of the model included investigations into stability, equilibrium points, the basic reproduction number R0, optimal control strategies, and sensitivity analyses. Estimation and fitting of the model parameters were conducted using daily situation reports from the Ministry of Health of Malaysia. The obtained value of the basic reproduction number, based on fitted parameter values, indicated stability and reflected the current pandemic situation more realistically. Additionally, the herd immunity threshold was calculated and interpreted in the context of the study findings. Finally, practical insights and recommendations derived from the model’s results were provided to inform government agencies, public health organizations, and intervention bodies, aimed at controlling the spread of the COVID-19 virus.","PeriodicalId":342917,"journal":{"name":"Journal of the Nigerian Society of Physical Sciences","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141266355","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

Constructive approach and randomization of a two-parameter chaos system for securing data 用于数据安全的双参数混沌系统的建设性方法和随机化

Journal of the Nigerian Society of Physical Sciences Pub Date : 2024-05-21 DOI: 10.46481/jnsps.2024.1747

Olalekan Taofeek Wahab, Salaudeen Alaro Musa, Abdulazeez Jimoh, K. Dauda

{"title":"Constructive approach and randomization of a two-parameter chaos system for securing data","authors":"Olalekan Taofeek Wahab, Salaudeen Alaro Musa, Abdulazeez Jimoh, K. Dauda","doi":"10.46481/jnsps.2024.1747","DOIUrl":"https://doi.org/10.46481/jnsps.2024.1747","url":null,"abstract":"Secure communication techniques are important due to the increase in the number of technology users across the world. Likewise, a more random encryption algorithm suitable to secure data from unauthorised users is highly expected. This paper proposes a two-parameter nonlinear chaos map that is sensitive to the trio seed (s0, alpha, lambda) and has better information encryption. We introduce the parameter alpha to linearise the conventional chaos system, which in turn brings a delay in the cryptosystems. The delay is a phenomenon that changes the chaotic features of a system. A small delay in the system leads to more aperiodicity and the unpredictability of the chaotic attractions. We normalise the new chaos map and use the Lipschitz and pseudo-contractive operators to obtain its irregularity region in Hilbert spaces. We also analyse the chaos map in terms of trajectory, Lyapunov exponent, complexity, and information entropy. Results obtained show that the new chaos map has a wide chaotic range and better statistical properties. It also maintains low complexity due to its linearity and produces more key spaces than most existing chaotic maps.","PeriodicalId":342917,"journal":{"name":"Journal of the Nigerian Society of Physical Sciences","volume":"8 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141117592","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

A model for the control of transmission dynamics of human monkeypox disease in Sub-Saharan Africa 撒哈拉以南非洲人类猴痘传播动态控制模型

Journal of the Nigerian Society of Physical Sciences Pub Date : 2024-05-13 DOI: 10.46481/jnsps.2024.1800

Bolarinwa Bolaji, Abdullahi Ibrahim, Favour Ani, B. Omede, Godwin Acheneje

{"title":"A model for the control of transmission dynamics of human monkeypox disease in Sub-Saharan Africa","authors":"Bolarinwa Bolaji, Abdullahi Ibrahim, Favour Ani, B. Omede, Godwin Acheneje","doi":"10.46481/jnsps.2024.1800","DOIUrl":"https://doi.org/10.46481/jnsps.2024.1800","url":null,"abstract":"The Human Monkeypox virus has received significant research interest in recent times. While few researchers have studied the effects of vaccination on human-to-animal or animal-to-human Monkeypox transmission, others just studied the effects of treatment on human Monkeypox. In this article, we made the proposition of a deterministic vaccine model that deals with the dynamics of the effects of vaccination and treatment on human Monkeypox in sub-Saharan Africa. We investigated the effects of vaccination on the various epidemiological classes qualitatively. The findings from the analysis of the model are that the model possesses two equilibria, locally asymptotically stable disease-free equilibrium (DFE) when an epidemiological threshold - the effective reproductive number is less than unity, and locally asymptotically stable endemic equilibrium when the number is greater than unity. We then corroborated the theoretical findings with numerical simulations, which reveal that when the rate of vaccination is increased resulting in many newly born persons in the populace being vaccinated, the prevalence of the deadly scourge is significantly reduced, while newly born individuals that miss vaccination experience a drastic torment of the deadly disease that often occasion death. Further revelation from the simulations is that when greater efforts","PeriodicalId":342917,"journal":{"name":"Journal of the Nigerian Society of Physical Sciences","volume":"100 48","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140984427","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

Deep convolutional neural network based synthetic minority over sampling technique: a forfending model for fraudulent credit card transactions in financial institution 基于合成少数过度采样技术的深度卷积神经网络：金融机构欺诈性信用卡交易的防范模型

Journal of the Nigerian Society of Physical Sciences Pub Date : 2024-05-12 DOI: 10.46481/jnsps.2024.2037

L. G. Salaudeen, D. Gabi, M. Garba, H. Suru

{"title":"Deep convolutional neural network based synthetic minority over sampling technique: a forfending model for fraudulent credit card transactions in financial institution","authors":"L. G. Salaudeen, D. Gabi, M. Garba, H. Suru","doi":"10.46481/jnsps.2024.2037","DOIUrl":"https://doi.org/10.46481/jnsps.2024.2037","url":null,"abstract":"\u0000\u0000\u0000Fraudulent credit card transactions are committed by unauthorized individuals and organizations employing methods such as phishing and social engineering fraud tactics. Researchers propose several Machine Learning (ML) techniques to deter the challenges of credit card fraud. However, the ML approaches are endorsed with some challenges, which makes the detection of credit card fraud extremely difficult. This study proposes a Deep Convolutional Neural Network (DCNN) with Synthetic Minority Oversampling Techniques (SMOTE) as an ideal solution. Kaggle datasets with 284,807 records and 31 features were exploited. Implementation was performed on the Google Colab cloud-based platform, embedding a Jupyter notebook setting with Graphical Processing Units (GPUs). Two experiments were conducted; the first was probed to determine suitable models among baseline models: Logistic Regression (LR), Random Forest (RF), Isolation Forest, and a single Deep Learning (DL) model of Multiple Layer Perceptron (MLP). The baseline models yielded an overfitting accuracy score, with recall, specificity, precision, and F1-score all presenting 1.00% respectively. This outcome is not sufficient in establishing findings on imbalanced data distribution as it's biased. This led to the construction of a new ML model incorporating Light Gradient Boosting Machine (LGBM), with Artificial Neural Network (ANN) and the proposed DCNN+SMOTE for the second experimental phase alongside baseline models. Experimental results via simulation show the proposed DCNN+SMOTE yielded awesome superclass performance across the board, displaying 1.00% results respectively. Its Error Rate (ER) and Null Error Rate (NER) are 0.00% distinctly. Meanwhile, the False Positive Rate (FPR) yields a 0.001% result, lesser and better than the baseline models.\u0000\u0000\u0000","PeriodicalId":342917,"journal":{"name":"Journal of the Nigerian Society of Physical Sciences","volume":"122 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140986387","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

Modelling the co-infection of malaria and zika virus disease 模拟疟疾和寨卡病毒疾病的共同感染

Journal of the Nigerian Society of Physical Sciences Pub Date : 2024-05-12 DOI: 10.46481/jnsps.2024.1938

E. C. Duru, Godwin Christopher Ezike Mbah, M. Anyanwu, Nicholas Topman Nnamani

{"title":"Modelling the co-infection of malaria and zika virus disease","authors":"E. C. Duru, Godwin Christopher Ezike Mbah, M. Anyanwu, Nicholas Topman Nnamani","doi":"10.46481/jnsps.2024.1938","DOIUrl":"https://doi.org/10.46481/jnsps.2024.1938","url":null,"abstract":"In this work, a new model for the co-infection of malaria and zika virus disease incorporating vaccination, treatment and vector control using sterile-insect technology (SIT) is formulated. The importance of this study is to highlight the possibility of the co-infection of humans with malaria and zika virus disease in any environment where both diseases co-circulate. Also, to suggest a new and comprehensive method for controlling the individual diseases and their co-infection. Through stability analysis, we showed that the disease-free equilibrium, (DFE) point of the co-infection model is locally asymptotically stable when the basic reproduction numbers, Rmz is less than one, and unstable otherwise. But, the DFE failed to be globally stable when Rmz < 1 which is an indication of existence of backward bifurcation in the model. This shows that bringing down the reproduction number, Rmz to less than one is not enough to eradicate the co-infection of the two diseases. Furthermore, it is shown that the two diseases have positive impact on the spread of each other, which could be attributed to misdiagnoses of one disease as the other. We also showed that effective treatment of infectious humans, increasing the rate of vaccination and employing sterile-insect technique to control the vectors significantly helped to control the individual diseases as well as the co-infection. From the results obtained in the study, it can be concluded that effective control of malaria and zika virus disease requires measures that will control their spread in both human and mosquito populations.","PeriodicalId":342917,"journal":{"name":"Journal of the Nigerian Society of Physical Sciences","volume":"115 40","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140986294","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

Enhancing cellulose fiber properties from chromolaena odorata and anana comosus through novel pulping chemical mixtures 通过新型制浆化学混合物提高臭椿和芒果的纤维素纤维性能

Journal of the Nigerian Society of Physical Sciences Pub Date : 2024-05-08 DOI: 10.46481/jnsps.2024.2033

O. Oluwasina, Mochamad Zakki Fahmi, O. Oluwasina

{"title":"Enhancing cellulose fiber properties from chromolaena odorata and anana comosus through novel pulping chemical mixtures","authors":"O. Oluwasina, Mochamad Zakki Fahmi, O. Oluwasina","doi":"10.46481/jnsps.2024.2033","DOIUrl":"https://doi.org/10.46481/jnsps.2024.2033","url":null,"abstract":"The production of cellulose with exceptional properties has led to the modification of chemical pulping methods and the development of newer chemical pulping methods. This study developed mixtures of sodium hydroxide, ethanol, and anthraquinone as new pulping chemicals to produce alpha-cellulose from pineapple leaves and Saim weed stems. The addition of anthraquinone was noticed to influence the pulp yield positively and the FTIR of all the cellulose has the characteristic cellulose bands. Calculated Total crystallinity index (TCI), (Lateral order index) LOI., and Hydrogen bond intensity (HBI) from the FTIR presented PLSHAEC (68.38 %) and SWSHQEC (67.74 %) having high crystallinity. From the XRD, the 2? by all the materials is attributed to cellulose I diffraction, and the crystallinity index aligned with FTIR determined crystallinity. The determined particle average diameter using ImageJ software showed that PLSHQEC 3.00 had the smallest value, followed by 5.17 for PLSHQC, 5.32 for SWSHQEC, and 6.03 for SWSHQEC. From the thermal analysis, the onset of the degradation of all the cellulose occurred at different temperatures: 247.10? (PLSHQC), 253.38? (PLSHQEC), 240.20? (SWSHQC) and 242.58? (SWSHQEC). The increase in yield, higher crystallinity index, and smaller fiber diameter of the cellulose demonstrated anthraquinone as a better additive to produce quality cellulose that would undergo easy chemical modification.","PeriodicalId":342917,"journal":{"name":"Journal of the Nigerian Society of Physical Sciences","volume":" 68","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141000057","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

Iterative method for the numerical solution of optimal control model for mosquito and insecticide 蚊虫和杀虫剂优化控制模型数值求解的迭代法

Journal of the Nigerian Society of Physical Sciences Pub Date : 2024-04-23 DOI: 10.46481/jnsps.2024.1965

S. Adamu, O. Aduroja, A. S. Onanaye, M. R. Odekunle, Pankaj Thakur

引用次数: 0