Search results
Title Predicting Earth-Vas2 parameters of coastal plain sand aquifers using artificial neural Network(s), in the Calabar region of Nigeria Author info Emmanuel I. Akaerue ... [et al.] Author Akaerue Emmanuel I. (35%)
Co-authors Onwuka Obialo S.
George Anthony M.
Ekwok Stephen Eguba
Alarifi Saad S.
Andráš Peter 1953- (30%) UMBFP01 - Katedra geografie a geológie
Eldosouky Ahmed M.
Source document Journal of African Earth Sciences. No. 209 (2024), pp. 1-12. - Oxford : Elsevier Ltd., 2024 Keywords hydrogeológia - hydrogeology korelačné koeficienty Headings Geogr. Nigéria Language English Country Great Britian Annotation 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 Public work category ADC No. of Archival Copy 54309 Catal.org. BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici Database xpca - PUBLIKAČNÁ ČINNOSŤ References PERIODIKÁ-Súborný záznam periodika 
article
Title O vojnách vonkajších, ale aj tých vnútorných Author info Zuzana Bariaková Author Bariaková Zuzana 1978- (100%) UMBFF13 - Katedra slovenskej literatúry a literárnej vedy
Source document Glosolália : rodovo orientovaný časopis. Roč. 12, č. 4 (2023), s. 221-224. - Bratislava : Literárne informačné centrum, 2023 Review document Pod konármi udaly / Chinelo Okparanta. - Bratislava : Inaque, 2022 Person keywords Okparanta Chinelo Keywords recenzie - reviews retrospektívy vojnové obdobie Headings Geogr. Nigéria Form. Descr. recenzie - reviews Language Slovak Country Slovak Republic URL Link na zdrojový dokument Public work category EDI No. of Archival Copy 53956 Catal.org. BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici Database xpca - PUBLIKAČNÁ ČINNOSŤ References PERIODIKÁ-Súborný záznam periodika article
Title Exploratory assessment of geothermal resources in some parts of the Middle Benue Trough of Nigeria using airborne potential field data Author info Hussain Jaber Alfaifi ... [et al.] Author Alfaifi Hussain Jaber (30%)
Co-authors 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%)
Source document Journal of King Saud University - Science. Vol. 35, no. 2 (2023), pp. [1-8]. - Amsterdam : Elsevier B.V., 2023 Keywords geotermálna energia - geothermal energy dáta - údaje - data spektrálna analýza Headings Geogr. Nigéria Form. Descr. články - journal articles Language English Country Netherlands URL Link na plný text Public work category ADM No. of Archival Copy 53319 Catal.org. BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici Database xpca - PUBLIKAČNÁ ČINNOSŤ References PERIODIKÁ-Súborný záznam periodika article
Title Towards understanding the extent of saltwater incursion into the coastal aquifers of Akwa Ibom State, Southern Nigeria using 2D ERT Author info Stephen E. Ekwok ... [et al.] Author Ekwok Stephen Eguba (30%)
Co-authors 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
Source document Journal of King Saud University - Science. Vol. 34, no. 8 (2022), pp. [1-8]. - Amsterdam : Elsevier B.V., 2022 Keywords slané vody pobrežia Headings Geogr. Nigéria Form. Descr. články - journal articles Language English Country Great Britian Annotation 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 Public work category ADM No. of Archival Copy 52293 Catal.org. BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici Database xpca - PUBLIKAČNÁ ČINNOSŤ References PERIODIKÁ-Súborný záznam periodika article
Title Nigérie - problémy a perspektivy "etnické" federace Author info Přemysl Rosůlek Author Rosůlek Přemysl
Source document Slabé státy : selhání, rozpad a obnova státnosti. S. 209-235. - Plzeň : Vydavatelství a nakladatelství Aleš Čeněk, 2007 / Ehl Martin Keywords federalizmus - federal government - federalism politický vývoj - political development politická stabilita - political stability Headings Geogr. Nigéria Language Czech Country Czech Republic systematics 321 Public work category ABD No. of Archival Copy E181 Repercussion category NAXERA, Vladimír. Subsaharská Afrika. In CABADA, Ladislav - ŠANC, David a kol. Panregiony ve 21. století : vývoj a perspektivy mezinárodních makroregionů. Plzeň : Vydavatelství a nakladatelství Aleš Čeněk, 2011. ISBN 978-80-7380-357-5, s. 79-111.
Catal.org. BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici Database xpca - PUBLIKAČNÁ ČINNOSŤ article