Potential field data play a vital role in mineral resource mapping, especially in deriving the lithological information of poorly mapped terrains. The Mundiyawas-Khera area of the Alwar basin in Rajasthan, India, is known for Cu mineralization hosted within the felsic volcanic rocks. However, much of the area is covered with soil and needs detailed lithological mapping. In this study, different machine learning (ML) algorithms have been employed to integrate the digital elevation, drilling wells, gravity, and magnetic data, together with their derivatives, for obtaining accurate lithology information of the area. Initially, five different ML algorithms, random forest (RF), K-nearest neighbor, support vector machine, multi-layer perceptron (MLP), and gradient boosting (GB) were employed using 540 samples from six lithological units to obtain the refined lithologic map of the area. Subsequently, a stacking classifier was built, considering the best-performing ML models in the base learner. Comparison of evaluation matrices (precision, recall, and confusion matrix) of these ML algorithms suggests that RF, GB, and stack model (RF + GB + MLP with RF meta-classifier) provide the highest accuracy score (RF: 74.69%, GB: 74.69%, and stack: 75.31%) and class membership probabilities in predicting the lithology. Adding derivatives and analytic signal information to the input data improves the classification accuracy of ML models by ~ 5-8%. Overall the study results demonstrate that ensemble ML algorithms can aid in creating the first-pass lithology map of areas with limited outcrops, drilling, and geochemical data.
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W odniesieniu do odpowiednich przepisów i wytycznych w artykule opisano sposoby umieszczania wewnętrznych linii zasilających i obwodów instalacji elektrycznych oraz związanego z nimi osprzętu. Autor analizuje szczegółowe wytyczne i normy w tym zakresie i dokładnie objaśnia, jak należy rozmieszczać strefy instalacyjne w pomieszczeniach.
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In relation to relevant regulations and guidelines, the article describes the ways of installing internal power supply lines, electricity installation circuits and equipment related to them. The author analyzes detailed guidelines and norms in the area and explains how installment zones in rooms should be located.
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Przedstawiono montażowe i spawalnicze aspekty budowy rurociągu podmorskiego w Morzu Bałtyckim. Omówiono zalety bębnowej metody wykonania rurociągu oraz zagadnienia prefabrykacji odcinków rurociągu na lądzie.
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The assembly method and welding technique problems concerning construction of the oil pipeline linking Baltic Beta platform with the town Władystawowo are presented. The advantages of "drum" method of pipeline assembly and problems of prefabrication of pipeline elements on land are also produced.
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