Yazar "Ersoy, Adem" seçeneğine göre listele

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    Applied Genetic Programming for Predicting Specific Cutting Energy for Cutting Natural Stones
    (Taylor & Francis Inc, 2017) Atici, Umit; Ersoy, Adem
    In the processing of marbles and other natural stones, the major cost involved in sawing with circular diamond sawblades is the energy cost. This paper reports a new and efficient approach to the formulation of SEcut using gene expression programming (GEP) based on not only rock characteristics but also design and operating parameters. Twenty-three rock types classified into four groups were cut using three types of circular diamond saws at different feed rates, depths of cut, and peripheral speeds. The input parameters used to develop the GEP-based SEcut prediction model were as follows: physicomechanical rock characteristics (uniaxial compressive strength, Shore scleroscope hardness, Schmidt rebound hardness, and Bohme surface abrasion), operating parameters (feed rate, depth of cut, and peripheral speed), and a design variable (diamond concentration in the sawblade). The performance of the model was comprehensively evaluated on the basis of statistical criteria such as R-2 (0.95).
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    Geochemical modelling and mapping of Cu and Fe anomalies in soil using combining sequential Gaussian co-simulation and local singularity analysis: a case study from Dedeyazi (Malatya) region, SE Turkey
    (Geological Soc Publ House, 2019) Ersoy, Adem; Yunsel, Tayfun Y.
    Mapping and modelling of the spatial distribution of geochemical anomalies is a key task for geochemical exploration. This case study explores mapping and modelling of Cu and Fe geochemical anomalies combining the Sequential Gaussian Co-simulation (SGCS) method and Local Singularity Analysis (LSA) in the Malatya region, SE Turkey. A total of 652 topsoil samples were collected on a regular grid design from the study area. A cell declustering technique was applied to the raw data. Both geometric and zonal anisotropy exist in the directional variogram of Cu and Fe. SGCS was applied to create maps representing an equally probable spatial distribution of Cu and Fe geochemical anomalies. SGCS results have been validated by a variety of tests including the reproduction of the variograms, histograms, descriptive statistics and contour plots. LSA is based on a sliding window estimation approach applied to the grid data created for SGCS realization. LSA was carried out and mapped via the results of the realization on the same grid layout. Critical anomaly threshold values of the variables were identified using the singularity and quantile plot. Integration of SGCS and LSA results provides quantification of the uncertainty of spatial distribution and determination of Cu and Fe critical thresholds.
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    Geological modeling of rock type domains in the Balya (Turkey) lead-zinc deposit using plurigaussian simulation
    (De Gruyter Poland Sp Z O O, 2013) Yunsel, Tayfun Y.; Ersoy, Adem
    Mineral resource evaluation requires defining geological rock-type domains. The traditional simulation methods have serious limitations for applications to large numbers of domains, which have complex contact relations. Plurigaussian simulation is an effective method which can be applied, in a simple way, to any number of domains, using both local and global geological information to infer the distributions of rock types. This work not only presents the application of the plurigaussian simulation method to the Balya lead-zinc deposit, but also assesses the spatially varying rock type proportions, and accounts for uncertainties between them. These parameters are extremely important for mining deposits, since the mineralizations of interest generally occur only in certain rock types. Furthermore, being able to model the different geological rock types is vital to good mine operations, production planning, and management. The results indicate that the plurigaussian method correctly reproduces the different orientations of the individual rock types, as seen in drill holes, and the proportion of each rock type, even if this varies in space.
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    The assessment of soil contamination by heavy metals using geostatistical sequential Gaussian simulation method
    (Taylor & Francis Inc, 2018) Ersoy, Adem; Yunsel, Tayfun Yusuf
    Soil contamination by heavy metals is continuously increasing with a great attention in the world. Because, these elements negatively affect living life and the ecosystem. A total of 652 surface soil samples were collected at 100, 200, 400m regular grid intervals from the study area in Turkey. The observed data does not show normal distribution. Cell declustering was done due to fact that data are not normal. Directional experimental semivariogram of the Cu and Ni showed that both geometric and zonal anisotropy exists in the data. Pb, Zn, Cr and Ba are qualified with omnidirectional experimental semivariogram models. The semivariograms characterized by spherical and Gaussian models of the elements were achieved. Geostatistical sequential Gaussian simulation (SGS) was applied to the study. A hundred simulated realizations depicted the spatial distribution and uncertainty of the elements in the site using a probabilistic approach which produced maps of the heavy metals. These maps showed contaminated and uncontaminated areas in the study site. The results revealed that 23%, 27%, and 24% of the study area at 60% probability were contaminated by the heavy metals including Cu, Cr, and Ni respectively. SGS results have been verified by a number of tests.
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    The current status of gold mining in Turkey: An overview
    (2022) Ersoy, Adem
    Gold has been treasured since ancient time for its beauty, purity, power, valuable asset and investment, accomplishment, and many more. However, gold also appeared in the last quarter of 20 th century as a basic metal due to its superior electrical conductivity, resistance to corrosion and required combinations of physical and chemical properties. Turkey has many gold deposits, which generally occurred in Late Mesozoic and Tertiary formations, and related to Mesozoic and Cenozoic volcano plutonic acts. However, the most economic porphyry, epithermal including both low and high sulphidation systems, volcanic associated massive sulphide gold deposits are abundantly found. Orogenic, placer and skarn host gold deposits are relatively less significant in terms of their abundance and reserve/resource sizes. Gold is embedded in Turkish life and plays a significant and innovative role in Turkey’s economy. Gold production has increased almost every year since 2001, rising from 1.4 tons to 45 tons in 2021. However, gold consumption does not meet gold production. Because Turkey is the fifth largest gold consumer in the world. The gold consumption is about 6 % of global demand. The review currently outlines a focus on geological and mining characteristics of gold deposits and features of gold such as its use, import, export and price.