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Öğe ASSESSMENT OF PILLAR DIMENSIONS OF CANKIRI-TURKEY ROCK SALT MINE BY NUMERICAL ANALYSES(INT SCIENTIFIC CONFERENCE SGEM, 2011) Ozsen, Hakan; Ozkan, Ihsan; Sensogut, CemCankiri rock salt formation is one of the most important rock salt sources of Turkey. Rock salt production in this area is performed by underground room and pillar mining method approximately 150 m under existing topography. However, pillar dimensions which are used in Cankiri rock salt mine are determined by trial and error method. Aim of this study is to create a model which will overlap long and short term rock mechanics analysis results with in-situ stresses and in-situ deformations. By the evaluation of these results pillar dimensions were determined by numerical methods. Numerical analyses were carried out with PHASE(2) software which uses a hybrid numerical modeling method. Firstly the pillar dimensions applied at the present time were investigated then different pillar dimensions were tested in order to investigate the boundary conditions of safe pillar dimensions.Öğe DETERMINATION OF COMBUSTION DEGREE OF SOME COAL SAMPLES FROM THE SHORT AND SULPHUR ANALSIS RESULTS BY USING ARTIFICIAL NEURAL NETWORKS(INT SCIENTIFIC CONFERENCE SGEM, 2011) Ozsen, Seral; Ozsen, Hakan; Sensogut, CemCoal is the most consumed fossil fuel in the world. Determination of the thermal properties of coal is a very important matter and it is not straightforward because of the heterogeneous structure of the coal. The short and elementary analysis results of coals with different carbonization degrees are different. The mineral composition of a coal also affects the thermal behavior. To detect thermal properties of coals, thermal analysis devices are generally used in many widespread methods. The most widely used methods in thermal analysis of coals are Differential Thermal Analysis (DTA) and Thermogravimetry (TG). In this study however, a different analysis method to determine combustion degree of coals was applied. By utilizing from some properties of coals obtained by short analysis and sulphur analysis, an Artificial Neural Network (ANN) was trained to predict the combustion degrees of coals. For this application 84 coal samples were prepared from 28 different locations in TURKEY. Among these, 67 samples were used in training ANN and the remaining 17 were used in test procedure. For the test samples, the trained ANN was used to predict the combustion degrees of them by presenting 8 different properties obtained from short and Sulphur analysis results. Then the mean squared error (mse) was calculated between the real combustion degrees which were also determined from the TG method and predicted combustion degrees of ANN. The test mse was found to be 2.9x10(-4). This result means that the trained ANN could predict combustion degree of a coal sample with a mean error of 2.9x10(-4). When the time and effort spend on determining thermal property of a coal sample with a classical method is considered, this gives another alternative to the experimenter for determining combustion degree of that sample in more short and effortless manner.Öğe An empirical model for the noise propagation in open cast mines - A case study(ELSEVIER SCI LTD, 2007) Sensogut, Cem; Cinar, IbrahimData obtained from 312 measurement stations of sound propagation in panel 48 of the Tuncbilek open cast mine, Western Lignite Corporation, Turkey have been used to create an empirical model for such propagation. As well as the noise level recorded at these stations, atmospheric conditions were recorded also by the meteorological station located at the same panel. A total of 95,000 noise values were recorded at these stations. In addition the distances of the measurement stations to the effective source of noise and to the working slope, the meteorological effects and the number of noise sources were defined for each of 312 measurement stations. Using these data, the proposed model was tested against the noise measurements. (C) 2006 Elsevier Ltd. All rights reserved.Öğe Evaluation of environmental factors affecting noise propagation(SPRINGER, 2009) Cinar, Ibrahim; Sensogut, CemIn this work, experiments were undertaken in an open field having 10,000 m(2) area purified from any noise on 121 survey stations using the central frequencies of seven different octave bands with a single and double artificially formed sources of noise. Meteorological parameters such as temperature, humidity, atmospheric pressure, velocity and direction of wind were also taken into consideration. Additionally, the effect of reflecting waves from any surface was also experimentally examined. To evaluate the data obtained, the statistical program of SPSS 9.05 was utilized. From this research, an equation utilising all the parameters was developed.Öğe INVESTIGATION OF THE OIL AGGLOMERATION OF ESKICELTEK LIGNITES IN TURKEY(STEF92 TECHNOLOGY LTD, 2014) Duzyol, Selma; Sensogut, CemOil agglomeration is one of the effective separation techniques that can be performed for the beneficiation of the fine particles in mineral processing. The oil agglomeration behavior of Eskiceltek, Amasya lignites was investigated in the present work. Raw lignite sample having an upper calorific value of 3046.8 kcal/kg has 51.03% of ash content. The experimental conditions were conducted as taking kerosene concentration, pH and agglomeration time into consideration. After realizing the oil agglomeration experiments, lignite sample was enriched with the ash content of 29.4% and 78% of combustible recovery.Öğe Investigation of the Thermal Improvement and the Kinetic Analysis of the Enriched Coal(HINDAWI LTD, 2018) Duzyol, Selma; Sensogut, CemThe present research work is comprised of three main parts. The first part is about the enrichment of lignite coal by the utilization of dense medium separation called float and sink method. The second part deals with the investigation of the thermal behaviour for the coals enriched while the last part is concerned with the kinetic analysis of the coal combustion. The float and sink method is the mostly used technique for low-rank coal beneficiation in coal preparation plants of Turkey. In order to realize this process, the coal samples were, at first, fractioned to five different sizes which were -32+ 25 mm, -25+ 16 mm, -16+ 8 mm, -8+ 4.75 mm, and -4.75+ 2 mm. Each fraction was, then, processed in the dense mediums with the specific gravities of 1.20, 1.30, 1.40, 1.50, and 1.60 g/cm(3), respectively. The thermal behaviour of the floated materials from the float and sink process was investigated in detail with the thermogravimetric analysis (TG) and the differential thermogravimetric analysis (DTG). The ignition and peak temperatures for the samples were also ascertained and correlated with the float and sink test results. In the final part of the study, the kinetic analysis of the coal samples was carried out by the Coats-Redfern method and the activation energies of the enriched coals were determined. The activation energies of the raw and the enriched coals were assessed and compared. The calculated activation energy values for the combustion reactions of the coal samples ranged were found to be between 15.17 kJ/mol and 97.45 kJ/mol. The strong correlation was obtained between the float and sink test results especially with the ash content of the coal samples and the combustible characteristic of the floated materials such as ignition temperatures, peak temperatures, and activation energies. The combustion characteristics of the coal samples were resultantly ascertained to be very dependent on the coal structure.Öğe Measurement and mathematical modelling of the creep behaviour of Tuzkoy rock salt(PERGAMON-ELSEVIER SCIENCE LTD, 2014) Ozsen, Hakan; Ozkan, Ihsan; Sensogut, Cem[Abstract not Available]
