International Journal of Physical Sciences最新文献_第10页

Assessment of outdoor radiation levels and radiological health hazards in Emene Industrial Layout of Enugu State, Nigeria 尼日利亚埃努古州埃梅内工业布局的室外辐射水平和放射性健康危害评估

International Journal of Physical Sciences Pub Date : 2018-12-30 DOI: 10.5897/IJPS2018.4763

F. Ugbede, I. Benson

{"title":"Assessment of outdoor radiation levels and radiological health hazards in Emene Industrial Layout of Enugu State, Nigeria","authors":"F. Ugbede, I. Benson","doi":"10.5897/IJPS2018.4763","DOIUrl":"https://doi.org/10.5897/IJPS2018.4763","url":null,"abstract":"A study to assess the outdoor Background Ionizing Radiation (BIR) levels in Emene Industrial Layout of Enugu State, Nigeria has been conducted. An in-situ measurement of BIR exposure rate in mRh-1 for 30 locations was done using a well calibrated portable GQ GMC-320 PLUS nuclear radiation detector at an elevation of 1.0 m above ground level with a geographical positioning system (GPS) for geographical location. The measured BIR exposure rates were used to evaluate the radiological health hazards and radiation effective doses to different body organs using well established radiological relations. The obtained values were compared with recommended permissible limits to ascertain the radiological health status of the environment. The mean values of BIR exposure levels (0.015±0.001 mRh-1), absorbed dose rates (126.15±5.10 ηGyh-1) and excess lifetime cancer risk (0.541±0.032×10-3) are higher than their recommended safe limits of 0.013 mRh-1, 84.0 ηGyh-1, 0.29×10-3 respectively as recommended by ICRP and UNSCEAR. The mean annual effective dose equivalent (0.155±0.006 mSvy-1) is within recommended permissible limits of 1.00 mSvy-1 for general public exposure. Also, the effective doses to different body organs are all below the recommended limits of 1.0 mSvy-1. Generally, the study shows that Emene Industrial Layout is radiologically contaminated due to industrial activities taking place. However, the contamination does not constitute any immediate radiological health effect on resident of the area but there is the potential for long-term health hazards in the future such as cancer due to accumulated doses. \u0000 \u0000 Key words: BIR exposure level, effective dose, industrial activities, Emene Industrial Layout.","PeriodicalId":14294,"journal":{"name":"International Journal of Physical Sciences","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83514117","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: 19

Magnetosphere convection electric field (MCEF) time variation from 1964 to 2009: Investigation on the signatures of the geoeffectiveness coronal mass ejections 1964 - 2009年磁层对流电场(MCEF)时间变化:地球有效性日冕物质抛射特征的研究

International Journal of Physical Sciences Pub Date : 2018-12-30 DOI: 10.5897/IJPS2018.4759

Kaboré Salfo, Ouattara Frédéric

{"title":"Magnetosphere convection electric field (MCEF) time variation from 1964 to 2009: Investigation on the signatures of the geoeffectiveness coronal mass ejections","authors":"Kaboré Salfo, Ouattara Frédéric","doi":"10.5897/IJPS2018.4759","DOIUrl":"https://doi.org/10.5897/IJPS2018.4759","url":null,"abstract":"The signatures of the geoeffectiveness solar disturbed events on the Magnetosphere Convection Electric Field (MCEF) universal time variation from 1964 to 2009 are investigated. Here, attention is focused our on the periods concerned by the whole shock activity and by the different types of the geoeffectiveness Coronal Mass Ejections (CMEs) which are one-day-shock, two-days-shock and three-days-shock. The investigation is made with respect to the orientation of the Interplanetary Magnetic Field (IMF). The MCEF time profiles show three different trends except for one-day-shock activity and for three-days-shock activity where we have four trends and one trend, respectively. The MCEF time profiles of the whole disturbed activity, the all shock activity and the one-day-shock activity present the initial phase where the Interplanetary Magnetic Field (IMF) is southward. During the two-days-shock activity, the initial phase of the MCEF shows a non-sensitive trend to the change of the direction of the IMF z-component while for the three-days-shock activity, the MCEF always exhibits the signature of the northward IMF. The last trend of the MCEF time profile shows the southward IMF signature except for the one-day-shock and the three-days-shock activities where that of the northward IMF was seen. \u0000 \u0000 Key words: Magnetosphere convection electric field, interplanetary magnetic field, shock activity, coronal mass ejections (CMEs).","PeriodicalId":14294,"journal":{"name":"International Journal of Physical Sciences","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74357519","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: 3

Noise exposure levels and health implications on daily road side petty traders at some major roundabouts in Ibadan, Nigeria 尼日利亚伊巴丹一些主要环岛上日常路边小商贩的噪音暴露水平和健康影响

International Journal of Physical Sciences Pub Date : 2018-12-16 DOI: 10.5897/IJPS2018.4775

T. T. Ogunseye, N. Jibiri, V. K. Akanni

{"title":"Noise exposure levels and health implications on daily road side petty traders at some major roundabouts in Ibadan, Nigeria","authors":"T. T. Ogunseye, N. Jibiri, V. K. Akanni","doi":"10.5897/IJPS2018.4775","DOIUrl":"https://doi.org/10.5897/IJPS2018.4775","url":null,"abstract":"The level of noise exposure to daily road side traders at five major roundabouts in Ibadan metropolis was assessed. Noise measurements were made using a precision multi-function sound level meter. Measurements were made at three different periods of the day; morning (7:30 to 11:30 a.m.), afternoon (12:00 to 3:00 p.m.) and evening (4:00 to 5.00 p.m.) for a consecutive period of ten days. The highest mean maximum noise levels of 87.19 dBA (evening), 87.14 dBA (morning) and 87.35 dBA (afternoon) were obtained at Ojo, Iwo road and Dugbe roundabouts respectively while all the lowest mean minimum noise level for the periods of measurements were obtained at Sango roundabout. The results obtained were within the safe recommended 90 dBA for an 8 h exposure noise level by Occupational Safety and Health Administration. However, longer periods beyond 8 h may portend deleterious acoustic effects to these traders given the peculiar nature of the daily road side business activities and also being close to sources of noise from vehicles at these roundabouts \u0000 \u0000 Key words: Noise exposure level, roundabout, noise health effects, road side petty traders.","PeriodicalId":14294,"journal":{"name":"International Journal of Physical Sciences","volume":"46 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89229927","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: 5

Mathematical modeling and numerical simulation for the formation process of nanofilms 纳米膜形成过程的数学建模与数值模拟

International Journal of Physical Sciences Pub Date : 2018-11-30 DOI: 10.5897/ijps2018.4741

M. M.

引用次数: 0

Deriving an expression for electron-reflection-coefficient at metal-semiconductor-interface of dye-sensitized solar cells 导出染料敏化太阳能电池金属-半导体界面电子反射系数表达式

International Journal of Physical Sciences Pub Date : 2018-10-30 DOI: 10.5897/ijps2018.4750

Garba Lurwan

引用次数: 0

Quantification and correction of the Thomsens Delta Anisotropy for improved quantitative seismic interpretation in AMFO Field, Western Niger Delta 西尼日尔三角洲AMFO油田汤姆逊三角洲各向异性量化与校正改进定量地震解释

International Journal of Physical Sciences Pub Date : 2018-10-16 DOI: 10.5897/IJPS2018.4758

D. Ogagarue, J. Ebeniro

{"title":"Quantification and correction of the Thomsens Delta Anisotropy for improved quantitative seismic interpretation in AMFO Field, Western Niger Delta","authors":"D. Ogagarue, J. Ebeniro","doi":"10.5897/IJPS2018.4758","DOIUrl":"https://doi.org/10.5897/IJPS2018.4758","url":null,"abstract":"The Niger Delta is a sedimentary deposit with continuing sediment deposition to date. In a stratified earth, seismic waves tend to propagate faster along layers than across layer boundaries. Shales, due to the clay minerals they contain, exhibit similar behavior. As a result, velocities derived from surface seismic are often faster than well-derived velocities, causing depths of structures from surface seismic interpretations to be much shallower than their true depths. Reservoir characterization workflows such as amplitude-versus offset (AVO) analysis, seismic inversion and pore pressure prognosis, which make use of seismic velocities to accurately delineate and define exploration targets, would be seriously impacted if velocity anisotropy is not quantified and the seismically-derived velocities corrected. Accurate quantification and correction of velocity anisotropy requires the use of offset vertical seismic profile (VSP) data to aid the estimation of the Thomsen’s anisotropic parameters, and . Unfortunately, such data are rarely acquired in many exploration projects and when they are available, they are often limited in areal coverage. In this study, an integrated approach using well and seismic data, based on the degree to which check shot and stacking interval velocity trends diverge with increasing depths, was utilized to quantify and correct seismically-derived velocity in AMFO field for improved quantitative seismic interpretation. Estimated anisotropy is between 2 and 22%, and becomes apparent at about 1,100 m true vertical depth subsea (TVDss). \u0000 \u0000 Key words: Velocity anisotropy, interval velocity, vertical seismic profile (VSP), anisotropic parameters, well velocity.","PeriodicalId":14294,"journal":{"name":"International Journal of Physical Sciences","volume":"112 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80869780","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

Radionuclide concentration: The coal ash effect 放射性核素浓度:煤灰效应

International Journal of Physical Sciences Pub Date : 2018-08-16 DOI: 10.5897/IJPS2018.4718

Amakom M. Chijioke, Orji E. Chikwendu, I. Chinedu, Eke C. Benedict, N. Amarachi, Madu D. Afam, Ugochuwu G. Kosisochukwu, Oforma J. Tochukwu

引用次数: 1

Mineralogical and geochemical properties of clay deposits in parts of Southeastern Nigeria 尼日利亚东南部部分地区粘土矿床的矿物学和地球化学性质

International Journal of Physical Sciences Pub Date : 2018-07-30 DOI: 10.5897/IJPS2018.4733

S. Onyekuru, P. O. Iwuoha, C. J. Iwuagwu, K. Nwozor, K. D. Opara

{"title":"Mineralogical and geochemical properties of clay deposits in parts of Southeastern Nigeria","authors":"S. Onyekuru, P. O. Iwuoha, C. J. Iwuagwu, K. Nwozor, K. D. Opara","doi":"10.5897/IJPS2018.4733","DOIUrl":"https://doi.org/10.5897/IJPS2018.4733","url":null,"abstract":"The rocks underlying many parts of Southeastern Nigeria had undergone extensive alterations to form considerable clay deposits. The mineralogical compositions of some of these clay deposits were evaluated with the X-Ray Diffraction (XRD) method to ascertain the suitability of the deposits as raw materials. Results of the analyses indicated that kaolinite (Al2Si2O5 (OH)4) is the dominant clay mineral. Traces of bentonite and dickite were also observed, while the identified non-clay minerals were quartz and iron. Chemical analysis of the clays revealed the predominance of SiO2, Al2O3, Fe2O3 and TiO with values ranging from 31.70 to 56.45%, 19.30 to 29.30%, 3.11 to 29.42% and 2.21 to 7.04%, respectively, while the compositions of CaO, MgO, Na2O, and MnO in the analyzed samples were relatively lower with values ranging from 0.19 to 0.29%, 0.13 to 0.19%, 0.11 to 0.70% and 0.01 to 0.03%, respectively. The Al2O3/TiO2 ratio (3.7 to 13.5) of the studied clays indicated a mafic to intermediate igneous rock origin. Binary plots of TiO2 versus Al2O3 to distinguish between granitic and basaltic sourced clays indicated basalt-rhyolite/granite provenances. The high chemical index of alteration (95.8%), chemical index of weathering (98.3%) and low contents of alkali and alkali earth elements (averaging 0.11%) of the clay-rich sediments, is indicative of a relatively intense weathering source area. The SiO2-K2O/Na2O plots suggested that the sediments in the study area were deposited between passive and active continental margins. In comparison with other reference clays and standard specifications, the clay deposits in the study area possess characteristics satisfactory for economic and some engineering purposes. \u0000 \u0000 Key words: Chemical, clay, deposits, economic, mineralogical, potentials, provenance.","PeriodicalId":14294,"journal":{"name":"International Journal of Physical Sciences","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76282657","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: 3

Theoretical models for prediction of methane production from anaerobic digestion: A critical review 预测厌氧消化产甲烷的理论模型:综述

International Journal of Physical Sciences Pub Date : 2018-07-16 DOI: 10.5897/ijps2018.4740

M. Mohamed, Dia Nourou, Bilal Boudy, N’Dongo Mamoudou

引用次数: 32

Energy and exergy analysis of a solar photovoltaic module performance under the Sahelian Environment 萨赫勒地区环境下太阳能光伏组件性能的能量和火用分析

International Journal of Physical Sciences Pub Date : 2018-06-30 DOI: 10.5897/ijps2018.4739

S. Ahmed, Ndiaye Diene, Kobor Diouma, E. Menny, Bouhamady Sidi

引用次数: 3