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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
Pub Date : 2018-12-30 DOI: 10.5897/IJPS2018.4763
F. Ugbede, I. Benson
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. Key words: BIR exposure level, effective dose, industrial activities, Emene Industrial Layout.
开展了一项评估尼日利亚埃努古州埃梅内工业布局地区室外背景电离辐射水平的研究。利用GQ GMC-320 PLUS便携式核辐射探测器,在距地面1.0 m的高度,利用GPS定位系统,对mRh-1地区30个地点的BIR暴露率进行了原位测量。利用已建立的放射学关系,利用测量的BIR照射率来评价辐射对人体不同器官的健康危害和辐射有效剂量。将所得值与建议允许限值进行比较,以确定环境的放射健康状况。BIR暴露水平平均值(0.015±0.001 mRh-1)、吸收剂量率平均值(126.15±5.10 ηGyh-1)和终生癌症风险平均值(0.541±0.032×10-3)均高于ICRP和UNSCEAR推荐的安全限值0.013 mRh-1、84.0 ηGyh-1、0.29×10-3。平均年有效剂量当量(0.155±0.006毫西维-1)在一般公众暴露的建议允许限度1.00毫西维-1之内。此外,对人体不同器官的有效剂量均低于1.0毫西维-1的建议限值。总体而言,研究表明,由于工业活动的发生,Emene工业布局受到辐射污染。然而,该污染不会对该地区居民的健康造成任何直接的辐射影响,但未来可能会因累积剂量而对健康造成长期危害,例如癌症。关键词:BIR暴露水平;有效剂量;工业活动;
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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
Pub Date : 2018-12-30 DOI: 10.5897/IJPS2018.4759
Kaboré Salfo, Ouattara Frédéric
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. Key words: Magnetosphere convection electric field, interplanetary magnetic field, shock activity, coronal mass ejections (CMEs).
研究了1964 ~ 2009年地球有效性太阳扰动事件对磁层对流电场(MCEF)通用时变化的特征。在这里,我们的注意力集中在整个冲击活动所涉及的周期和不同类型的地球有效性日冕物质抛射(cme),即一天冲击,两天冲击和三天冲击。对行星际磁场的方向进行了研究。MCEF时间曲线显示了三种不同的趋势,除了一天的冲击活动和三天的冲击活动,我们分别有四个趋势和一个趋势。整个扰动活动、全部激波活动和一天激波活动的MCEF时间剖面均呈现行星际磁场(IMF)向南的初始阶段。在2天震荡活动期间,MCEF的初始阶段对IMF z分量方向变化的趋势不敏感,而在3天震荡活动期间,MCEF始终表现出IMF向北的特征。MCEF时间曲线的最后一个趋势显示,除了在一天冲击和三天冲击活动中可以看到北向IMF的特征外,IMF的特征是向南的。关键词:磁层对流电场,行星际磁场,激波活动,日冕物质抛射
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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
Pub Date : 2018-12-16 DOI: 10.5897/IJPS2018.4775
T. T. Ogunseye, N. Jibiri, V. K. Akanni
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 Key words: Noise exposure level, roundabout,  noise health effects, road side petty traders.
对伊巴丹市五个主要环形交叉路口的日常路边商贩的噪音暴露水平进行了评估。采用精密多功能声级计进行噪声测量。测量是在一天中的三个不同时段进行的;上午(7:30至11:30)、下午(12:00至3:00)和晚上(4:00至5:00),连续10天。Ojo、Iwo road和Dugbe环形交叉路口的平均最大噪声水平最高,分别为87.19 dBA(傍晚)、87.14 dBA(早晨)和87.35 dBA(下午),而Sango环形交叉路口的平均最小噪声水平最低。所获得的结果在职业安全与健康管理局推荐的8小时暴露噪声水平90 dBA的安全范围内。然而,考虑到日常路边商业活动的特殊性,以及在这些回旋处靠近车辆噪声源,超过8小时的时间可能会对这些小贩造成有害的声学影响。关键词:噪音暴露水平,回旋处,噪音健康影响,路边小商贩。
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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
Pub Date : 2018-11-30 DOI: 10.5897/ijps2018.4741
M. M.
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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
Pub Date : 2018-10-30 DOI: 10.5897/ijps2018.4750
Garba Lurwan
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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
Pub Date : 2018-10-16 DOI: 10.5897/IJPS2018.4758
D. Ogagarue, J. Ebeniro
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). Key words: Velocity anisotropy, interval velocity, vertical seismic profile (VSP), anisotropic parameters, well velocity.
尼日尔三角洲是一个沉积矿床,至今仍在继续沉积。在分层的地球中,地震波沿层传播的速度往往比跨层传播的速度快。页岩由于含有粘土矿物,表现出类似的行为。因此,由地面地震得到的速度往往比准确得到的速度快,导致地面地震解释得到的结构深度比实际深度浅得多。利用地震速度准确圈定和确定勘探目标的储层表征工作流程,如振幅相对偏移量(AVO)分析、地震反演和孔隙压力预测,如果不量化速度各向异性并对地震导出的速度进行校正,将受到严重影响。速度各向异性的精确量化和校正需要使用偏置垂直地震剖面(VSP)数据来帮助估计Thomsen各向异性参数。不幸的是,在许多勘探项目中很少获得这种数据,即使可以获得,它们的覆盖范围也往往有限。在本研究中,利用井震资料的综合方法,根据检井和叠加层段速度趋势随深度增加的差异程度,对AMFO油田的地震导出速度进行了量化和校正,以提高定量地震解释。估计各向异性在2%到22%之间,在水下1100米的真实垂直深度(TVDss)时变得明显。关键词:速度各向异性,层速度,垂直地震剖面,各向异性参数,井速。
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引用次数: 0
Radionuclide concentration: The coal ash effect 放射性核素浓度:煤灰效应
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
Radionuclide concentrations in coal ash, soil mixed with coal ash and soil were determined using the gamma spectroscopic method. The average activity concentrations of 226Ra, 232Th, and 40K in coal ash samples were found as 35.0, 5.8, and 109.4 Bq/kg, respectively. The average activity concentrations of 226Ra, 232Th and 40K in soil mixed with coal ash samples varied from 21.2 to 30.8, 48.6 to 82.7, and 162.5 to 180.1 Bq/kg, respectively. The activity concentrations of radionuclides from the non-mixed soil area, which serves as a control to this study ranged from 123.95 to 128.82, 16.33 to 18.38, and 46.63 to 50.30 Bq/kg, respectively for radionuclides 40K, 226Ra, and 232Th, respectively. From the radiological calculations, it was found that the use of coal ash as a soil additive contributed slightly to the radionuclide concentrations of the area under study. Key words: Radionuclide, coal ash, radium equivalent, external and internal hazard index.
用伽马光谱法测定了煤灰、煤灰混合土壤和土壤中的放射性核素浓度。煤灰样品中226Ra、232Th和40K的平均活性浓度分别为35.0、5.8和109.4 Bq/kg。煤灰混合土壤中226Ra、232Th和40K的平均活性浓度分别为21.2 ~ 30.8、48.6 ~ 82.7和162.5 ~ 180.1 Bq/kg。作为对照的非混合土壤区放射性核素40K、226Ra和232Th的活度浓度分别为123.95 ~ 128.82、16.33 ~ 18.38和46.63 ~ 50.30 Bq/kg。从放射学计算中发现,使用煤灰作为土壤添加剂对所研究地区的放射性核素浓度有轻微影响。关键词:放射性核素,煤灰,镭当量,内外危害指数。
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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
Pub Date : 2018-07-30 DOI: 10.5897/IJPS2018.4733
S. Onyekuru, P. O. Iwuoha, C. J. Iwuagwu, K. Nwozor, K. D. Opara
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. Key words: Chemical, clay, deposits, economic, mineralogical, potentials, provenance.
尼日利亚东南部许多地区的岩石经过了广泛的变化,形成了相当多的粘土沉积物。用x射线衍射(XRD)方法对部分粘土矿床的矿物学成分进行了评价,以确定其作为原料的适宜性。分析结果表明,高岭石(Al2Si2O5 (OH)4)是主要粘土矿物。此外,还发现了膨润土和地基土的痕迹,而鉴定的非粘土矿物为石英和铁。化学分析结果显示,SiO2、Al2O3、Fe2O3和TiO含量占主导地位,分别为31.70 ~ 56.45%、19.30 ~ 29.30%、3.11 ~ 29.42%和2.21 ~ 7.04%,而CaO、MgO、Na2O和MnO含量相对较低,分别为0.19 ~ 0.29%、0.13 ~ 0.19%、0.11 ~ 0.70%和0.01 ~ 0.03%。黏土的Al2O3/TiO2比值(3.7 ~ 13.5)表明其成因为基性—中火成岩。TiO2与Al2O3的二元图用于区分花岗岩和玄武岩源粘土,表明玄武岩-流纹岩/花岗岩物源。富粘土沉积物的蚀变化学指数高(95.8%),风化化学指数高(98.3%),碱和碱土元素含量低(平均0.11%),表明其风化源区相对强烈。SiO2-K2O/Na2O图表明研究区沉积介于被动大陆边缘和活动大陆边缘之间。与其他参考粘土和标准规格相比,研究区粘土矿床具有令人满意的经济和工程特性。关键词:化学,粘土,矿床,经济,矿物学,潜力,物源。
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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
Pub Date : 2018-07-16 DOI: 10.5897/ijps2018.4740
M. Mohamed, Dia Nourou, Bilal Boudy, N’Dongo Mamoudou
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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
Pub Date : 2018-06-30 DOI: 10.5897/ijps2018.4739
S. Ahmed, Ndiaye Diene, Kobor Diouma, E. Menny, Bouhamady Sidi
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引用次数: 3
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