RESEARCH JOURNAL OF PURE SCIENCE AND TECHNOLOGY最新文献

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Modeling Survival Dynamics of Women at Child Birth Using Delay Differential Equation 用延迟微分方程模拟分娩妇女的生存动力学

RESEARCH JOURNAL OF PURE SCIENCE AND TECHNOLOGY Pub Date : 2023-09-25 DOI: 10.56201/rjpst.v6.no1.2023.pg1.12

Peters Nwagor

{"title":"Modeling Survival Dynamics of Women at Child Birth Using Delay Differential Equation","authors":"Peters Nwagor","doi":"10.56201/rjpst.v6.no1.2023.pg1.12","DOIUrl":"https://doi.org/10.56201/rjpst.v6.no1.2023.pg1.12","url":null,"abstract":"A numerical simulation analysis of a time delay differential equations model involving human population dynamics was carried out to quantify the impact of probability of survival of women to child bearing age on the dynamical system. The study assumed that there are three population of women of child bearing class which include the juvenile women (J w ), child bearing class of women ( ) and the menopause women ( ). A computational approach was adopted in the study which involved the numerical simulation of the human population dynamics using ODE 45 numerical scheme. Result predicted a decrease in the population of juvenile women and fluctuation in the population class of child bearing women and menopause women for a varying value of the probability of survival of women to child bearing age. Result further showed a decrease in the population of juvenile women and an increase in the population of class of child bearing women and a fluctuation in the population of menopause at t=20. However, predominantly unstable dynamical system was predicted leading to unstable steady state solution of the time delayed differential equation involving human population dynamics. The study recommended that women of menopause age should stop child bearing in order to enhance their longevity and women of juvenile age and women of child bearing age should adopt antenatal and post-natal facilities domiciled in the public health centers to curtail the death of women during child bearing.","PeriodicalId":494028,"journal":{"name":"RESEARCH JOURNAL OF PURE SCIENCE AND TECHNOLOGY","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135858839","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

Levels of Heavy Metals in Surface Water of Oge-Etche River, Etche, Rivers State, Nigeria 尼日利亚河流州Oge-Etche河地表水重金属含量

RESEARCH JOURNAL OF PURE SCIENCE AND TECHNOLOGY Pub Date : 2023-09-25 DOI: 10.56201/rjpst.v6.no1.2023.pg53.65

E.S. Edori, C. Ucheaga, M. N. Timothy

{"title":"Levels of Heavy Metals in Surface Water of Oge-Etche River, Etche, Rivers State, Nigeria","authors":"E.S. Edori, C. Ucheaga, M. N. Timothy","doi":"10.56201/rjpst.v6.no1.2023.pg53.65","DOIUrl":"https://doi.org/10.56201/rjpst.v6.no1.2023.pg53.65","url":null,"abstract":"The levels of heavy metals in surface water of Oge-Etche River, Etche, Rivers State, Nigeria was assessed. Analysis of the heavy metals was performed after due laboratory procedures with a thermo Atomic Elemental Absorption Spectrophotometer (model SE-71906). The average levels of the investigated heavy metals in the surface water of the river within the stations in the months of investigations were in the range as follows; Fe; 1.6585±0.069-3.8758±0.123mg/L, Pb; 1.7164±0.078-2.2913±0.101mg/L, Cu; 1.4271±0.068-3.7419±0.188mg/L, Cr; 4.6070±0.284- 6.2551±0.241mg/L, Cd; 0.0246±0.018-1.5386±0.051mg/L, Ni; 3.0057±0.040-4.4311±0.135mg/L, and As; 0.0473±0.056-1.3072±0.063mg/L. The average occurrence of heavy metals in the stations of the river during the period of investigation were in the order Cr > Ni > Fe > Cu > Pb > Cd > As. The pollution assessment indices adopted in the evaluation of the influence of anthropogenic input on the level of heavy metals in the river using WHO maximum acceptable limit as basis were, contamination factor, pollution load index, contamination degree, and modified contamination degree. These indices indicated that the heavy metals examined have contaminated the river to a high degree and the river may not be suitable for domestic use.","PeriodicalId":494028,"journal":{"name":"RESEARCH JOURNAL OF PURE SCIENCE AND TECHNOLOGY","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135859646","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

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