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Extraction of ionospheric vertical total electron content (VTEC) using global navigation satellite system-continuously operating reference station (GNSS-CORS) data from station BF01 in Ouagadougou 利用瓦加杜古 BF01 站的全球导航卫星系统连续运行基准站数据提取电离层垂直电子总含量(VTEC
Pub Date : 2024-03-31 DOI: 10.5897/ijps2023.5065
Ouédraogo Pouraogo, G. Karim, Diabaté Abidina, Fleury Rolland, Ouattara Frédéric
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引用次数: 0
Effect of basalt on the mechanical and thermal behavior of a lightweight concrete based on Typha australis 玄武岩对基于香蒲的轻质混凝土的力学和热学行为的影响
Pub Date : 2024-02-29 DOI: 10.5897/ijps2023.5058
Oumar Abdelhakh Azibert, Hisseine Issaka Alhadj, Soultan Malloum, Sow Djibril, Gaye Salif
This article examines the impact of integrating basalt aggregates into concrete based on Typha australis for housing applications. We conducted an experimental study focusing on mechanical and thermal characterization to analyze the influence of basalt aggregates compared to the results of previous work on T. australis concrete without basalt. The results indicate that both density and mechanical resistance to compression decrease with the dosage of Typha, yet the values obtained are significantly higher than those of concrete without basalt. Additionally, thermal resistance increases with the Typha dosage. However, for low Typha dosages, the thermal resistance is slightly higher than that of concrete without basalt, whereas for high dosages, it is slightly lower. Nevertheless, this finding allows for a reduction in the building's thermal load and an enhancement of thermal comfort. However, it's important to note that the mechanical strength remains relatively low for a high-strength structure.
本文探讨了将玄武岩骨料融入以香蒲为基础的混凝土中对房屋应用的影响。我们进行了一项实验研究,重点关注力学和热学特征,以分析玄武岩骨料与之前不含玄武岩的香蒲混凝土研究结果相比所产生的影响。结果表明,随着香蒲掺量的增加,密度和机械抗压性能都会降低,但所获得的数值明显高于不含玄武岩的混凝土。此外,热阻也随着香蒲掺量的增加而增加。不过,在低掺量的情况下,热阻略高于不含玄武岩的混凝土,而在高掺量的情况下,热阻则略低。尽管如此,这一发现还是降低了建筑物的热负荷,提高了热舒适度。不过,值得注意的是,对于高强度结构而言,机械强度仍然相对较低。
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引用次数: 0
Mapping of geological structures controlling mineralization in parts of the Lower Benue Trough, Nigeria, using high resolution aeromagnetic data 利用高分辨率航空磁数据绘制控制尼日利亚下贝努埃海槽部分地区矿化的地质结构图
Pub Date : 2024-02-29 DOI: 10.5897/ijps2023.5047
J. M. Chukwuebuka, C. E. Chukwudi
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引用次数: 0
Variability of the electric field of magnetospheric convection in recurrent activity during the solar cycle 24 太阳周期 24 期间周期性活动中磁层对流电场的可变性
Pub Date : 2023-12-31 DOI: 10.5897/ijps2023.5039
Alfred Stephane Dama, Salfo Kaboré, Sibri Alphonse Sandwidi, Frédéric Ouattara
This paper employs a statistical approach to investigate the diurnal variability of the magnetospheric convective electric field (MCEF) during recurrent activity, considering the phases of solar cycle 24. This study reveals that the magnetosphere exhibits greater dynamism during the maximum and descending phases on recurrent days. The diurnal variability of the MCEF on days of recurrent geomagnetic activity indicates the following trends: (a) An increasing trend followed by a decreasing trend at the phase minimum of the solar cycle; (b) A decreasing trend followed by an increasing trend during the ascending phase and the phase maximum, and (c) five trends during the descending phase. From the minimum phase of the solar cycle to the falling phase, the daily mean values of the MCEF are 0.07428018, 0.10682778, 0.14172194, and 0.11505584 mV/m, respectively. Night-time magnetic reconnections with a southern interplanetary magnetic field (IMF) occur at the phase maximum of the solar cycle and during all-phase periods. Daytime magnetic reconnections occur during the ascending phase at 0700 UT and during the descending phase at 1000 UT.
本文考虑到太阳周期 24 的各个阶段,采用一种统计方法来研究磁层对流电场(MCEF)在周期性活动期间的日变化。这项研究表明,磁层在周期日的最大阶段和下降阶段表现出更大的活力。地磁活动反复日的 MCEF 日变化趋势如下:(a)在太阳周期的阶段性最小值时呈上升趋势,随后呈下降趋势;(b)在上升阶段和阶段性最大值时呈下降趋势,随后呈上升趋势;(c)在下降阶段呈五种趋势。从太阳周期的最小阶段到下降阶段,MCEF 的日平均值分别为 0.07428018、0.10682778、0.14172194 和 0.11505584 mV/m。夜间磁场与南行星际磁场(IMF)的重新连接发生在太阳周期的相位最大值和全相位期间。昼间磁场重新连接发生在世界标准时间 7 时的上升阶段和世界标准时间 10 时的下降阶段。
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引用次数: 0
Contribution of solar quiet (Sq) daily current variations to the deep earth conductivity within the Southern African Region 日静(Sq)流日变化对南部非洲地区深层地球电导率的贡献
Pub Date : 2023-11-30 DOI: 10.5897/ijps2023.5027
A. O. Ngozi, N. Francisca, Emmanuel Awucha Igwe
This work focuses on determining the source current systems by applying the method of spherical harmonic analysis (SHA) to geomagnetic field data obtained from ground measurements. The objectives are to establish the mantle conductivity-depth profile and to compare the results of the profiles from four stations with other research findings. The study utilizes magnetometer data obtained for the year 2011 from geomagnetic stations located in Hermanus, Maputo, Tsumeb, and Hartebeesthoek within the Southern African region. The Gauss SHA method, along with Matlab software, is employed to separate the internal and external field contributions to solar quiet (Sq) current variations. Subsequently, a transfer function is used to calculate the electrical conductivity-depth profile of the region. The results show that, across all the stations, the highest seasonal Sq current was recorded in the month of June for Hartebeesthoek, Hermanus, and Tsumeb regions. Maputo, however, exhibited an exception with nearly triple peaks in the months of March, June, and December, with the highest occurring during the December solstice. The evaluated maximum values for seasonal Sq current in Hartebeesthoek, Hermanus, Maputo, and Tsumeb are approximately 16.0, 12.5, 12.0, and 14.8 nT, respectively. An equinoxial maximum with a value of 2.1 × 103 A was observed in the seasonal external Sq current in March within the Maputo region, while a solsticial minimum with a value of 0.75 × 103 A occurred in June in the Hartebeesthoek region. The seasonal separated external Sq current system pattern appears to be the same as that of the seasonal Sq current system, indicating that the source of the Sq current system is external to the Earth. The study reveals the greatest depth of Sq current penetration and the highest electrical conductivity values within the Southern African region when compared with other research. Finally, this research contributes to establishing the electrical conductivity of Maputo and Hartebeesthoek regions, where no prior work has been conducted.
这项工作的重点是通过对地面测量获得的地磁场数据应用球谐波分析(SHA)方法来确定源电流系统。目的是确定地幔传导深度剖面,并将四个站点的剖面结果与其他研究成果进行比较。这项研究利用了 2011 年从南部非洲地区的赫曼努斯、马普托、楚姆布和哈特比斯托克地磁站获得的磁强计数据。利用高斯 SHA 方法和 Matlab 软件,分离了内部和外部磁场对日静(Sq)电流变化的贡献。随后,利用传递函数计算该地区的电导率-深度剖面。结果表明,在所有观测站中,哈特比斯特胡克、赫曼努斯和楚姆布地区在 6 月份记录到的季节性 Sq 电流最高。然而,马普托的情况例外,在 3 月、6 月和 12 月出现了近三倍的峰值,其中最高值出现在 12 月的日至日。哈特比斯特胡克、赫尔马努斯、马普托和楚梅布的季节性 Sq 海流最大值分别约为 16.0、12.5、12.0 和 14.8 nT。在马普托地区,3 月份观测到季节性外部 Sq 海流的赤经最大值(2.1 × 103 A),而在哈特比斯索克地区,6 月份观测到赤纬最小值(0.75 × 103 A)。季节性分离的外部 Sq 海流系统模式似乎与季节性 Sq 海流系统模式相同,表明 Sq 海流系统的源头在地球外部。与其他研究相比,该研究揭示了南部非洲地区最大的 Sq 电流渗透深度和最高的导电率值。最后,这项研究有助于确定马普托和哈特比斯图克地区的电导率,此前在这两个地区还没有开展过相关工作。
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引用次数: 0
foF2 diurnal variation at Dakar station during the period of geomagnetic shock of variable duration over solar cycle 21 and 22: Prediction with IRI 2016 太阳周期 21 和 22 期间持续时间不等的地磁冲击期间达喀尔站的 foF2 日变化:利用 IRI 2016 进行预测
Pub Date : 2023-11-30 DOI: 10.5897/ijps2023.5048
Mahamat Nour Ali, Gouara Douzane, Alphonse Sandwidi Sibri, Ouattara Frederic
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引用次数: 0
Hydrogeological assessment of groundwater resources within Isuikwuato and environ South Eastern Nigeria: Agenda for food agriculture and clean water policies 伊苏克沃托和尼日利亚东南部周边地区地下水资源水文地质评估:粮食农业和清洁水政策议程
Pub Date : 2023-10-31 DOI: 10.5897/ijps2023.5035
Chima CHIZOBA Joshua, Ojonugwa USMAN Ayatu, Chris EZEH Chukwudi, Augustine CHINWUKO Ifeanyi, AZUOKO George-Best, Chigoziem AKAKURU Obinna, Obinna IHEME Kenneth
Groundwater resources of the Isuikwuato area, south eastern Nigeria, have been evaluated using integrated geophysical and hydrogeochemical techniques, to determine the quality and usability of the groundwater for domestic and agricultural purposes. Twenty Vertical Electrical Soundings (VES) physicochemical analyses were done. Depth to aquiferous unit varies from 38 to 148 m. The hydrogeochemical characterization shows that anion area, 85% of the total water sample in the area is Cl- dominant, whereas 10% are HCO3- dominant and 5% of the sample had mixed dominant ionic specie. In the cation area, 75% of the total water samples had Ca2+ as their dominant ionic specie, while 25% of the samples had mixed dominant ionic specie. According to the Piper diagram, the region is in the geochemical zone 1 (Alkalines earth exceeds Akalines). The Durov plot demonstrates that there is ionic exchange occurring within the groundwater zone with a hydrogeochemical evolution trend of Cl-> HCO3-+CO32-> Ca2+>Na++K+> SO42-> Mg2+. Principal Component Analysis (PCA) values indicated loadings were present for 37.42% of the parameters (PP) in PP1, 65.60% of the parameters in PP2 and in PP3, it had 75.23 loadings. The water is suitable for agriculture giving the value of calculated Sodium Adsorption Ratio (SAR) that ranges from 0.20 – 0.56. This study recommends that the government should leverage this to availability of clean water and food to the people to enable it to achieve its sustainable development goals (SDGs).   Key words: Groundwater, hydrogeochemistry, geophysical, aquiferous zone, Isuikwuato.
利用综合地球物理和水文地球化学技术对尼日利亚东南部Isuikwuato地区的地下水资源进行了评价,以确定用于家庭和农业目的的地下水的质量和可用性。进行了20次垂直电测深(VES)物化分析。含水单元的深度从38米到148米不等。水文地球化学表征表明,阴离子区85%的水样以Cl-为主,10%的水样以HCO3-为主,5%的水样以混合离子为主。在阳离子区,75%的水样以Ca2+为优势离子种,25%的水样以混合优势离子种。根据Piper图,该区域位于地球化学1区(碱性地球超过碱性地球)。Durov图表明,地下水区存在离子交换,其水文地球化学演化趋势为Cl->HCO3 - + CO32→Ca2 +祝辞Na + + K +比;SO42→Mg2 +。主成分分析(PCA)结果表明,PP1中37.42%的参数(PP)、PP2中65.60%的参数(PP)、PP3中75.23%的参数(PP)均存在负荷量。计算得出的钠吸附比(SAR)值在0.20 ~ 0.10;0.56. 本研究建议,政府应利用这一点,为人民提供清洁水和食物,使其能够实现其可持续发展目标(SDGs)。关键词:地下水;水文地球化学;地球物理;
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引用次数: 0
Geo-spatial distribution of radio refractivity and the influence of fade depth on microwave propagation signals over Nigeria 尼日利亚上空无线电折射率的地理空间分布以及衰减深度对微波传播信号的影响
Pub Date : 2023-07-31 DOI: 10.5897/ijps2023.5036
Lawrence Ojo Olalekan
The need for more bandwidth for a broad range of purposes necessitates research into how radio refractivity, multipath fading, and geoclimatic variables affect terrestrial and satellite propagation links. In this study, a geographical distribution approach to radio refractivity and fade depth over five locations in Nigeria—Akure, Enugu, Jos, Minna, and Sokoto based on five-year (2017–2021) measured data of atmospheric pressure, relative humidity, and temperature—at two levels (ground surface and 100 m heights). The results demonstrated the percentage occurrence of the dry terms dominating the radio refractivity constituent at the surface level, with a minimum and maximum contributions of about 78 and 92%, while at heights of 100 m, the percentage occurrence of the dry terms dominated the radio respectively refractivity constituent, contributing a minimum of about 79% and a maximum of about 92%. The spatial distribution reveals that, regardless of height, the tropical rainforest (TRF) and freshwater swampy mangrove (FWSM) regions reported the highest values of radio refractivity. The statistical estimate shows that fading values can differ by as much as 1.5 dB, especially near the TRF and FWSM coastlines, even during clear air conditions. The current findings will be helpful for budgeting Earth-space microwave links, particularly for the rollout 5G and future-generation microcellular networks in Nigeria.
由于需要更多带宽用于各种用途,因此有必要研究无线电折射率、多径衰减和地理气候变量如何影响地面和卫星传播链路。在这项研究中,根据五年(2017-2021 年)的大气压力、相对湿度和温度测量数据,在两个层面(地表和 100 米高度)对尼日利亚五个地点--阿库雷、埃努古、乔斯、明纳和索科托--的无线电折射率和衰减深度进行了地理分布分析。结果表明,在地表水平,干燥项在无线电折射成分中占主导地位,其最小和最大贡献率分别约为 78% 和 92%;而在 100 米高度,干燥项在无线电折射成分中占主导地位,其最小贡献率约为 79%,最大贡献率约为 92%。空间分布显示,无论高度如何,热带雨林(TRF)和淡水沼泽红树林(FWSM)地区的无线电折射率值最高。统计估算表明,即使在晴朗的空气条件下,衰减值也会相差 1.5 分贝,尤其是在热带雨林和淡水沼泽红树林海岸线附近。目前的研究结果将有助于编制地空微波链路的预算,特别是在尼日利亚推出 5G 和未来一代微蜂窝网络时。
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引用次数: 0
Mannheim partner curves in the special linear group 特殊线性群中的Mannheim伙伴曲线
Pub Date : 2023-03-31 DOI: 10.5897/ijps2023.5023
DE ThiagoA., A. Mendonça
In this study, we state some basic results about the geometry of the special linear group SL(2,R), seen as a subset of , in terms of the left invariant fields, such as bracketing, Levi Civita connection ∇ and Riemann curvature tensor R, we give some basic theorems for Mannheim partner curves in the special linear group. We also find the relations between the curvatures and torsions of these associated curves and we give necessary and sufficient conditions for a given curve to be a Mannheim partner curve of another given curve through a relation between its curvature and torsion.
在本文中,我们给出了作为子集的特殊线性群SL(2,R)的几何的一些基本结果,在左不变域,如bracketing, Levi Civita连接∇和Riemann曲率张量R方面,我们给出了特殊线性群中Mannheim伴曲线的一些基本定理。我们还发现了这些关联曲线的曲率与扭转之间的关系,并通过曲率与扭转之间的关系,给出了一个给定曲线是另一个给定曲线的曼海姆伙伴曲线的充分必要条件。
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引用次数: 0
A mathematical model development to investigate the impact of key parameters on the generated voltage hysteresis of silicon anode based lithium half cells 建立了一个数学模型,研究了关键参数对硅负极半锂电池产生电压滞后的影响
Pub Date : 2023-03-31 DOI: 10.5897/ijps2022.5003
Abir Hossain Al-Mustasin
Lithium-ion batteries are widely used in various energy storage systems. In this article, a physics-based mathematical model of silicon micro-particle (SiMP) anode is developed to identify the principal reasons of voltage hysteresis occurrence during lithiation and delithiation battery cycling of silicon (Si) anode-based lithium half cells. Firstly, lithium diffusion, reaction kinetics, thermodynamics and mechanical stress and strain are selected, and relevant mathematical equations are developed. To examine the impact of hydrostatic stresses on electrochemical reactions in battery electrodes, a modified version of Butler-Volmer (BV) kinetics equation including hydrostatic stress induced voltage term is implemented. For model development, essential parameters are identified and sensitivity analysis is conducted to figure out the best fitted parametric values. Finally, a physics-based mathematical model is developed to investigate the impact of key parameters on generated voltage hysteresis of the SiMP half cells. Using this mathematical model, voltage curves are generated and fitted with the experimental results. In addition, the model is used to identify performance limitations. By examining the influence of the key parameters on the voltage curves during battery cycling, the model exhibits the principal causes of voltage differences during lithiation and delithiation. The detail of this article will provide more crucial information.
锂离子电池广泛应用于各种储能系统中。本文建立了硅微粒子(SiMP)阳极的物理数学模型,以确定硅(Si)阳极基锂半电池在锂化和耗竭电池循环过程中电压滞后发生的主要原因。首先,选取了锂扩散、反应动力学、热力学和机械应力应变等参数,建立了相应的数学方程;为了研究静水应力对电池电极电化学反应的影响,建立了一个包含静水应力诱导电压项的改进的Butler-Volmer (BV)动力学方程。在模型开发中,识别必要的参数并进行灵敏度分析,找出最适合的参数值。最后,建立了一个基于物理的数学模型,研究了关键参数对SiMP半电池产生电压迟滞的影响。利用该数学模型生成了电压曲线,并与实验结果进行了拟合。此外,该模型还用于识别性能限制。通过考察电池循环过程中关键参数对电压曲线的影响,该模型揭示了锂化和衰减过程中电压差异的主要原因。本文的细节将提供更重要的信息。
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引用次数: 1
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International Journal of Physical Sciences
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