Yazar "Cinar, Ibrahim" seçeneğine göre listele

Listeleniyor 1 - 3 / 3
  • Küçük Resim Yok
    Öğe
    An empirical model for the noise propagation in open cast mines - A case study
    (ELSEVIER SCI LTD, 2007) Sensogut, Cem; Cinar, Ibrahim
    Data 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.
  • Küçük Resim Yok
    Öğe
    Evaluation of environmental factors affecting noise propagation
    (SPRINGER, 2009) Cinar, Ibrahim; Sensogut, Cem
    In 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.
  • Küçük Resim Yok
    Öğe
    Investigation of gasification characteristics of some coals in Turkey by the thermogravimetric analysis method
    (TAYLOR & FRANCIS INC, 2018) Cinar, Ibrahim; Altun, Mustafa
    When the coal is heated, conversion process starting with moisture loss passes through pyrolysis, burning and gasification processes depending on the atmosphere, temperature rise rates, final temperature and other parameters. Since coal has a heterogeneous structure, interpretation of these phases is difficult. Thermogravimetric analysis, on the other hand, has a wide range of applications and allows valid approaches to the physical and chemical properties of coal. Therefore, the thermogravimetric analysis makes it possible to analyze the characteristics of the coal gasification phase in a practical and rapid manner.In this study, the gasification characteristics of coal samples taken from Ilgn, Ermenek and Zonguldak regions in Turkey were determined. Conversion time and gasification rates of Ilgn and Ermenek coals were investigated using thermogravimetric analyzer at 700 degrees C, 750 degrees C, 800 degrees C and 850 degrees C in CO2 atmosphere and comparisons were made between samples. In addition, conversion and gasification rates of coal samples taken from Zonguldak region at 1150 degrees C were investigated. It was observed that the conversion time of the Ilgn coal at 800 degrees C and the Ermenek coal at 850 degrees C was shorter than the other temperatures. When the 80% conversion rates of Ilgn coal at 800 degrees C, Ermenek coal at 850 degrees C, and Zonguldak at 1150 degrees C, are compared; it is observed that there exist a 1,2 min difference between Ilgn-Zonguldak, 1,05 min between Ilgn-Ermenek and 1,96 min between Ermenek and Zonguldak coals.