Výsledky vyhľadávania
Názov Predicting Earth-Vas2 parameters of coastal plain sand aquifers using artificial neural Network(s), in the Calabar region of Nigeria Aut.údaje Emmanuel I. Akaerue ... [et al.] Autor Akaerue Emmanuel I. (35%)
Spoluautori Onwuka Obialo S.
George Anthony M.
Ekwok Stephen Eguba
Alarifi Saad S.
Andráš Peter 1953- (30%) UMBFP01 - Katedra geografie a geológie
Eldosouky Ahmed M.
Zdroj.dok. Journal of African Earth Sciences. No. 209 (2024), pp. 1-12. - Oxford : Elsevier Ltd., 2024 Kľúč.slová hydrogeológia - hydrogeology korelačné koeficienty Heslá geogr. Nigéria Jazyk dok. angličtina Krajina Veľká Británia Anotácia This study employs artificial neural networks (ANNs), specifically the Nonlinear Autoregressive with External Input (NARX) model as an ANN add-on for Matlab, to forecast Earth-Vas2 parameters. The model leverages a time series approach, with the Earth-Vas2 index (y(t)) as the predictive target and various parameters (eleva tions, static water level, aquifer material thickness, transmissivity, hydraulic conductivity, specific capacity, vadose media) denoted as x(t) to facilitate accurate predictions. The Levenberg-Marquardt training algorithm was applied to the ANN using geo-hydraulic data from 56 boreholes for training and 24 boreholes for validation and testing. Validation metrics such as mean square error (MSE), correlation coefficient (R), and coefficient of determination (R2 ) were utilized. The results indicate a high degree of accuracy, with low MSE values of 0.0171 (training), 0.0087 (validation), and 0.0327 (testing). Strong correlation coefficients (R) of 0.9882, 0.9898, and 0.9844, along with high R2 values (97.66%), emphasize the robustness of the ANN model. Actual and predicted Earth-Vas2 values exhibit a similar pattern, affirming the model’s effectiveness. The R-value of 0.9882 signifies a strong positive correlation within the model, validating its ability to capture variable interactions in fluid migration control. Geo-hydraulic Earth-Vas2 maps identify areas with varying migration efficiency, guiding groundwater management. The study emphasizes routine subsurface assessments for crucial data in environ mental planning and risk reduction in industrial and municipal activities. This method provides cost-effective estimation of key geo-hydraulic properties for aquifer vulnerability assessments, with far-reaching implica tions for groundwater management, environmental protection, and land use planning. URL Link na plný text Kategória publikačnej činnosti ADC Číslo archívnej kópie 54309 Katal.org. BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici Báza dát xpca - PUBLIKAČNÁ ČINNOSŤ Odkazy PERIODIKÁ-Súborný záznam periodika 
článok
Názov Exploratory mapping of the geothermal anomalies in the neoproterozoic Arabian shield, Saudi Arabia, using magnetic data Aut.údaje Kamal Abdelrahman ... [et al.] Autor Abdelrahman Kamal (20%)
Spoluautori Ekwok Stephen Eguba (15%)
Ulem Christian Atelwhobel (10%)
Eldosouky Ahmed M. (5%)
Al-Otaibi Naif (5%)
Hazaea Bashar Y. (10%)
Hazaea Saddam Ali (5%)
Andráš Peter 1953- (20%) UMBFP01 - Katedra geografie a geológie
Akpan Anthony E. (10%)
Zdroj.dok. Minerals : international, peer-reviewed, open access journal of natural mineral systems, mineral resources, mining, and mineral processing. Vol. 13, no. 5 (2023), art. no. 694, pp. [1-15]. - Basel : Multidisciplinary Digital Publishing Institute, 2023 Kľúč.slová mapovanie - mapping anomálie geotermálna energia - geothermal energy Heslá geogr. Saudská Arábia Form.deskr. články - journal articles Jazyk dok. angličtina Krajina Švajčiarsko URL Link na plný text Kategória publikačnej činnosti ADC Číslo archívnej kópie 53318 Kategória ohlasu OUALID, Melouah - EBONG, Ebong D. Lithospheric and asthenospheric properties of the saharan platform inferred from potential field, geoid and heat flow data. In Journal of african earth sciences. ISSN 1464-343X, 2024, vol. 209, art. no. 105124, pp. 1-13.
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Názov Direct detection of groundwater accumulation zones in saprock aquifers in tectono-thermal environments Aut.údaje Anthony E. Akpan ... [et al.] Autor Akpan Anthony E. (20%)
Spoluautori Ekwok Stephen Eguba (10%)
Ben Ubong Camilus (5%)
Ebong Ebong Dickson (5%)
Thomas Jewel Emem (5%)
Ekanem Aniekam Martin (5%)
George Nyaknno J. (5%)
Abdelrahman Kamal (5%)
Fnais Mohammed S. (5%)
Eldosouky Ahmed M. (5%)
Andráš Peter 1953- (20%) UMBFP01 - Katedra geografie a geológie
Alarifi Saad S. (10%)
Zdroj.dok. Water. Vol. 15, no 22 (2023), pp. 1-21. - Basel : Multidisciplinary Digital Publishing Institute, 2023 Kľúč.slová podzemné vody podzemné termálne vody saprockové vodonosné vrstvy - saprock aquifers Form.deskr. články - journal articles Jazyk dok. angličtina Krajina Švajčiarsko Anotácia VES data acquired in tectono-thermally disturbed environments sometimes contain outliers when plotted on a bi-logarithmic graph. These noisy datasets usually distort the discernible trend of the VES curve, by plotting abnormally above or below its dominant trend at the point of their occurrence. This type of distortion is different from those arising from other causes such as galvanic and static distortions, which usually affect a segment of a curve without changing the curve’s trend. Allowing these unusual points to remain within the datasets during the data processing and modelling phases always produces unsatisfactory results because their presence usually causes the root-mean-square error to exceed the preset acceptable limit. Consequently, such data points are usually deleted to recover the trend of the curve and generate interpretable models during the traditional curve-smoothening (data processing) phase. This study has shown that these unusual data points are indicative of groundwater accumulation zones in porous medium and can also estimate likely borehole productivities in tectono-thermally disturbed environments. A single-point drop signifies a low-yielding fracture characterized by small apertures. The groundwater yield from this group of fractures can barely support the daily domestic water needs of some families. However, VES curves where two or more points break away from the trend of the curve indicate high-yielding fractures or nonconformities, provided that the resistivity value of the first break-point is lower than those of subsequent ones. The productivity level of this category of fractures is high enough to support the water needs of families. The apparent resistivities of these saturated fractures usually vary between 40 and 500 Wm, depending on the nature of the host rock. These qualitative interpretations have been confirmed by drilling and Water 2023, 15, 3946 17 of 21 pumping test results. Depths to these water-filled fractures, though location-dependent, typically vary between 40 and 100 m in the study area. These saturated fractures are common in locations with high lineament density. Optimal data-quality-management practices—including determining the sensitivity level of the equipment, repeating the measuring process, and changing the potential electrode positions and, where possible, the VES profile orientation—must be implemented to confirm the integrity and subterranean nature of the break-off points. URL Link na plný text Kategória publikačnej činnosti ADC Číslo archívnej kópie 53990 Katal.org. BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici Báza dát xpca - PUBLIKAČNÁ ČINNOSŤ Odkazy PERIODIKÁ-Súborný záznam periodika článok
Názov Exploratory assessment of geothermal resources in some parts of the Middle Benue Trough of Nigeria using airborne potential field data Aut.údaje Hussain Jaber Alfaifi ... [et al.] Autor Alfaifi Hussain Jaber (30%)
Spoluautori Ekwok Stephen Eguba (10%)
Ulem Christian Atelwhobel (5%)
Eldosouky Ahmed M. (5%)
Qaysi Saleh (5%)
Abdelrahman Kamal (5%)
Andráš Peter 1953- (25%) UMBFP01 - Katedra geografie a geológie
Akpan Anthony E. (15%)
Zdroj.dok. Journal of King Saud University - Science. Vol. 35, no. 2 (2023), pp. [1-8]. - Amsterdam : Elsevier B.V., 2023 Kľúč.slová geotermálna energia - geothermal energy dáta - údaje - data spektrálna analýza Heslá geogr. Nigéria Form.deskr. články - journal articles Jazyk dok. angličtina Krajina Holandsko URL Link na plný text Kategória publikačnej činnosti ADM Číslo archívnej kópie 53319 Katal.org. BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici Báza dát xpca - PUBLIKAČNÁ ČINNOSŤ Odkazy PERIODIKÁ-Súborný záznam periodika článok
Názov Towards understanding the extent of saltwater incursion into the coastal aquifers of Akwa Ibom State, Southern Nigeria using 2D ERT Aut.údaje Stephen E. Ekwok ... [et al.] Autor Ekwok Stephen Eguba (30%)
Spoluautori Ben Ubong Camilus (10%)
Eldosouky Ahmed M. (10%)
Qaysi Saleh (5%)
Abdelrahman Kamal (10%)
Akpan Anthony E. (10%)
Andráš Peter 1953- (25%) UMBFP04 - Katedra životného prostredia
Zdroj.dok. Journal of King Saud University - Science. Vol. 34, no. 8 (2022), pp. [1-8]. - Amsterdam : Elsevier B.V., 2022 Kľúč.slová slané vody pobrežia Heslá geogr. Nigéria Form.deskr. články - journal articles Jazyk dok. angličtina Krajina Veľká Británia Anotácia The hydro-lithostratigraphic units of the coastal area of Akwa Ibom State, Southern Nigeria were investigated involving electrical resistivity tomography (ERT) and Wenner array. This procedure and electrode configuration were adopted because of their wide range of sensitivity and inherent characteristics to geological materials. This study is aimed at defining the extent of saltwater invasions into the coastal and inland aquifers. The investigated area is divided into three zones A ( 0 < 20 km), B (<20 < 40 km), and C (>40 km)) based on the distance from the survey locations to the shoreline. The saline aquifer of the control tomogram obtained at the shoreline (Ibeno Beach) is characterized by the electrical resistivity of 0.159–3.55 Om. Within Zone A, (Ukpenekang, Eastern Obolo, and Okoro Ette), the saline aquifer is defined by electrical resistivity values of 0.33–44.0 Om, 2.07–48.5 Om, and 8.0–60.0 Om respectively. In general, the Zone B saline aquifers are defined by electrical resistivity values of 0.602–64.5 Om. Furthermore, the third zone which is situated a distance >40 km from the shoreline, is described by relatively higher electrical resistivity values (38.9–3260 Om) and indicates a region free from saltwater incursions. Generally, the 2D ERT models showed that electrically resistivity values increase progressively inland. URL Link na plný text Kategória publikačnej činnosti ADM Číslo archívnej kópie 52293 Katal.org. BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici Báza dát xpca - PUBLIKAČNÁ ČINNOSŤ Odkazy PERIODIKÁ-Súborný záznam periodika článok
Názov Towards understanding the source of brine mineralization in Southeast Nigeria: evidence from high-resolution airborne magnetic and gravity data Aut.údaje Stephen Eguba Ekwok ... [et al.] Autor Ekwok Stephen Eguba (20%)
Spoluautori Akpan Anthony E. (10%)
Achadu Ogiji-Idaga M. (20%)
Thompson Cherish E. (10%)
Eldosouky Ahmed M. (10%)
Abdelrahman Kamal (10%)
Andráš Peter 1953- (20%) UMBFP04 - Katedra životného prostredia
Zdroj.dok. Minerals : international, peer-reviewed, open access journal of natural mineral systems, mineral resources, mining, and mineral processing. Vol. 12, no. 2 (2022), pp. [1-18]. - Basel : Multidisciplinary Digital Publishing Institute, 2021 Kľúč.slová kvapaliny - liquids magnetizmus - magnetism gravitácia - gravity - gravitation mineralizácia - mineralization Jazyk dok. angličtina Krajina Švajčiarsko Anotácia Investigation into understanding the genesis of brines in southeast Nigeria was carried out utilizing high‐resolution potential field (HRPF) data. This study reveals that igneous intrusions and associated hydrothermal fluids are responsible for brine generation. The obtained result of the analytic signal revealed the locations and spatial distribution of short‐ and long‐wavelength geologic structures associated with igneous intrusions. The low pass filtering, upward continuation, and 2D modelling procedures showed key synclinal structures which coincided well with the location of brine fields. The results showed that salt ponds are common in the neighborhood of igneous intrusions. To validate this finding, a conceptual model describing igneous‐related hydrothermal circulation systems that are driven by convective cells of the hydrothermal fluid and overburden loads was generated. This model fits reasonably well into the overall stratigraphic and geologic framework of the study area. URL Link na plný text Kategória publikačnej činnosti ADC Číslo archívnej kópie 51523 Kategória ohlasu OGUNGBEMI, Oluwaseun Samuel - OYEBODE, Kazeem - BADMUS, Ganiyu Olabode - OGUNYEMI, Adebayo Tajudeen. Modeling of structural features from aeromagnetic maps using an improved deep learning technique. In Earth science informatics. ISSN 1865-0473, 2022, vol. 15, no. 4, pp. 2665-2671.
SHABANI, Ali - ZIAII, Mansour - MONFARED, Mehrdad Solimani - SHIRAZY, Adel - SHIRAZI, Aref. Multi-dimensional data fusion for mineral prospectivity mapping (MPM) using fuzzy-AHP decision-making method, Kodegan-Basiran region, East Iran. In Minerals. ISSN 2075-163X, 2022, vol. 12, no. 12, pp. 1-23.
LIU, Yan-Xu - LI, Wen-Yong - LIU, Zhi-Yuan - ZHAO, Jia-Wei - CAO, An-Qi - GAO, Shan - WANG, Li-Jie - YANG, Cheng. Occurrence characteristics of magnetite and aeromagnetic prospecting Northeast of Hebei province. In Minerals. ISSN 2075-163X, 2022, vol. 12, no. 9, pp. 1-26.
KAMTO, Paul Gautier - OKSUM, Erdinc - LEMOTIO, Willy - KAMGUIA, Joseph. Structural mapping of the Goulfey-Tourba (West and Central African Rift) sedimentary basin using high-resolution gravity data. In Earth sciences research journal. ISSN 1794-6190, 2023, vol. 27, no. 3, pp. 239-249.
POUR, Amin Beiranvand - RAHMANI, Omeid - PARSA, Mohammad. Editorial for the special issue : multispectral remote sensing satellite data for mineral and hydrocarbon exploration : big data processing and deep fusion learning techniques. In Minerals. ISSN 2075-163X, 2023, vol. 13, no. 2, pp. 1-5.
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