Özbayoğlu, Gülhan

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https://hdl.handle.net/20.500.14411/8014
Name Variants
Gulhan, Ozbayoglu
O.,Gulhan
O., Gulhan
Ö.,Gülhan
Ozbayoglu,G.
G., Ozbayoglu
Özbayoğlu,G.
G.,Özbayoğlu
Özbayoğlu, Gülhan
G.,Ozbayoglu
Ozbayoglu, Gulhan
Gülhan, Özbayoğlu
Ozbayoglu, G.
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Profesör Doktor
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Main Affiliation
Energy Systems Engineering
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Former Staff
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Sustainable Development Goals

2

ZERO HUNGER
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0

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11

SUSTAINABLE CITIES AND COMMUNITIES
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1

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14

LIFE BELOW WATER
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1

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6

CLEAN WATER AND SANITATION
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1

NO POVERTY
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5

GENDER EQUALITY
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9

INDUSTRY, INNOVATION AND INFRASTRUCTURE
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16

PEACE, JUSTICE AND STRONG INSTITUTIONS
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17

PARTNERSHIPS FOR THE GOALS
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15

LIFE ON LAND
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10

REDUCED INEQUALITIES
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7

AFFORDABLE AND CLEAN ENERGY
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8

DECENT WORK AND ECONOMIC GROWTH
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4

QUALITY EDUCATION
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12

RESPONSIBLE CONSUMPTION AND PRODUCTION
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3

GOOD HEALTH AND WELL-BEING
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Scholarly Output

12

Articles

8

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WoS Citation Count

117

Scopus Citation Count

133

WoS h-index

6

Scopus h-index

7

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WoS Citations per Publication

9.75

Scopus Citations per Publication

11.08

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JournalCount
Physicochemical Problems of Mineral Processing3
26th International Mineral Processing Congress, IMPC 2012: Innovative Processing for Sustainable Growth - Conference Proceedings -- 26th International Mineral Processing Congress, IMPC 2012: Innovative Processing for Sustainable Growth -- 24 September 2012 through 28 September 2012 -- New Delhi -- 976541
International Journal of Coal Preparation and Utilization1
Journal of Alloys and Compounds1
Journal of Rare Earths1
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Now showing 1 - 10 of 12
  • Thumbnail Image
    Article
    Citation - WoS: 22
    Citation - Scopus: 21
    Synthesis and Thermoluminescence Properties of Rare Earth Oxides (y, Ce-Lu) Doped Lithium Triborate
    (Elsevier Science Bv, 2011) Depci, Tolga; Ozbayoglu, Gulhan; Yilmaz, Aysen
    Lithium triborate (LiB(3)O(5)) was synthesized by high temperature solid-state reaction method, and then rare earth oxides were doped into LiB(3)O(5) to enhance its thermoluminescent (TL) properties. The identification and characteristics of the obtained compounds were determined by X-ray diffraction (XRD), Fourier transform infrared (FTIR) analyses, differential thermal analyses (DTA) and scanning electron microscopy (SEM). The glow curves were obtained using a thermoluminescent (TL) reader. The results revealed that all the rare earth oxides were not good activators for lithium triborate and the obtained compounds could not be used for dosimetric applications.
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    Book Part
    Commercial Coal Preparation Plants Capability for the Removal of Trace Elements
    (Springer International Publishing, 2016) Özbayoğlu,G.
    Işiklar and Dereköy coal preparation plants clean lignite coals produced in Soma district. Run-ofmine coals contain trace elements and major elements that are associated with coal and inorganic matter. Trace elements are potentially harmful for human health and ecosystem. Physical coal cleaning is effective in reducing the concentration of many trace elements. In this study, the samples were collected from run-ofmine lignite (feed), coal preparation plant products, namely coarse (+18 mm) clean coal, fine (10-18mm, 0.5- 10mm) clean coals, middlings, coarse and fine refuses and slimes from the Dereköy and Işiklar plants systematically and chemical analyses of ash, trace and major elements were performed on each sample. Trace elements contents and distributions in each product were determined. During the cleaning of run-of-mine lignites in Işiklar and Dereköy coal preparation plants, 54.69% and 72.04% ash have been removed from the plants, respectively. Around 1/3 of Ga and Rb contents of Işiklar feed and more than 1/3 of Ga, Rb, Sr, contents of Dereköy feed could be removed by ash. Referring to major elements, rejection of 60% Ca and 53% Mg from Işiklar, and 69% Ca and around 80% Mg from Dereköy plants have been achieved. © Springer International Publishing Switzerland 2016.
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    Conference Object
    Citation - WoS: 7
    Citation - Scopus: 7
    Synthesis, Characterizations and Investigation of Thermoluminescence Properties of Strontium Pyrophosphate Doped With Metals
    (Pergamon-elsevier Science Ltd, 2014) Ilkay, L. S.; Ozbayoglu, G.; Yilmaz, A.
    Strontium pyrophosphate, Sr2P2O7, was synthesized by solid-state synthesis method; the product was co-doped with copper-silver (Cu-Ag), copper-indium (Cu-In) and manganese-praseodymium (Mn-Pr) oxides (CuO, MnO, In2O3, Pr6O11 and AgNO3) by solid-state reaction method. The variation of dopant concentrations was investigated from 0.5 to 15% by weight. In addition to these processes, chemical characterizations of samples and the investigation of thermoluminescence (TLD) properties of strontium pyrophosphate with and without dopants were conducted. For the characterization; powder X-ray Diffraction (XRD) were implemented for phase purity of samples. Fourier Transform Infrared Spectroscopy (FTIR) was used to determine whether the bond structures were affected from the doping or not. Thermoluminescence (TLD) analyses were conducted on strontium pyrophosphate doped with different amounts of dopants for the first time. Glow curves showed that intensities were affected by different amounts of dopants. It can be concluded from that strontium pyrophosphate doped with 7% MnO and 1% Pr6O11 had the most powerful peak intensity around 160 degrees C and dosimetric property for promising application. (C) 2014 Elsevier Ltd. All rights reserved.
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    Article
    Citation - Scopus: 10
    Removal of hazardous air pollutants based on commercial coal preparation plant data
    (2013) Ozbayoglu,G.
    This paper investigates the concentration, distribution, and rejection of hazardous air pollutants, specifically identified by the US Clean Air Act Amendments of 1990, based on commercial coal preparation plant data obtained on-site. The samples were collected from the products of the different cleaning circuits of the operating plant. The concentrations of twelve potentially hazardous trace elements, including As, Cd, Co, Cr, Hg, Mn, Ni, Pb, Se, Th and U in those samples were determined. Compared with the average concentration of the trace elements in Turkish coals, the run-of-mine coal fed to the existing plant appears to contain higher concentrations of Cd, Hg, Mn, Th and V. However, the concentrations of As, Cd, Cr, Mn, Se, Th, U and V of the run-of-mine coal are above the world averages. Cd, Cr, Hg, Mn, Pb and Th concentrations of run-of-mine coal were easily removed at commercial coal preparation plant refuse in the range of 51.8% to 77.4 %, while only a small reduction was achieved for U and V as they were concentrated in clean coals. The present study reveals that conventional coal preparation technologies could significantly reduce hazardous air pollutants concentrations in coal.
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    Article
    Citation - WoS: 6
    Removal of Hazardous Air Pollutants Based on Commercial Coal Preparation Plant Data
    (oficyna Wydawnicza Politechniki Wroclawskiej, 2013) Ozbayoglu,G.
    This paper investigates the concentration, distribution, and rejection of hazardous air pollutants, specifically identified by the US Clean Air Act Amendments of 1990, based on commercial coal preparation plant data obtained on-site. The samples were collected from the products of the different cleaning circuits of the operating plant. The concentrations of twelve potentially hazardous trace elements, including As, Cd, Co, Cr, Hg, Mn, Ni, Pb, Se, Th and U in those samples were determined. Compared with the average concentration of the trace elements in Turkish coals, the run-of-mine coal fed to the existing plant appears to contain higher concentrations of Cd, Hg, Mn, Th and V. However, the concentrations of As, Cd, Cr, Mn, Se, Th, U and V of the run-of-mine coal are above the world averages. Cd, Cr, Hg, Mn, Pb and Th concentrations of run-of-mine coal were easily removed at commercial coal preparation plant refuse in the range of 51.8% to 77.4 %, while only a small reduction was achieved for U and V as they were concentrated in clean coals. The present study reveals that conventional coal preparation technologies could significantly reduce hazardous air pollutants concentrations in coal.
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    Article
    Citation - WoS: 4
    Citation - Scopus: 8
    Partitioning of major and trace elements of a Turkish lignite with size and density
    (oficyna Wydawnicza Politechniki Wroclawskiej, 2011) Ozbayoglu, Gulhan; Energy Systems Engineering
    This research was devoted to determine the concentration and distribution of major and trace elements in a Turkish lignite and to investigate the partitioning behaviour of them in various size and density fractions to estimate the possibility of removal of trace elements by conventional coal cleaning. Three size fractions which were used in industrial coal cleaning processes were chosen. Each size fraction was separated into various density fractions by float and sink tests, which were evaluated for major and trace elements. These tests showed that by applying the same size and density fractions of industrial coal cleaning processes, more than 70% of Mo, Nb, Nd, W, Hg and Zr could be removed, which were approximately equal to the result achieved for ash removal.
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    Article
    Citation - WoS: 50
    Citation - Scopus: 54
    The Effect of Synthesis and Doping Procedures on Thermoluminescent Response of Lithium Tetraborate
    (Elsevier Science Sa, 2011) Pekpak, E.; Yilmaz, A.; Ozbayoglu, G.
    Lithium tetraborate has been a scientific focus since 1960s by the courtesy of the thermoluminescence property it possesses. Moreover, it is utilized in surface acoustic wave apparatuses, in sensor sector and in laser technology owing to its non-linear optical characteristics. For the uses in thermoluminescence dosimetry lithium tetraborate is activated by addition of a variety of metals as dopants. This study includes the synthesis of lithium tetraborate by two methods (high temperature solid state synthesis and water/solution assisted synthesis), doping of activators into the matrix material synthesized and characterization of the products. Lithium tetraborate is readily commercially available in TL (Themoluminescence) dosimetry; hence, the main aim in this study was to specify the effect of synthesis and doping methods on the TL response. The heating temperature for the synthesis was 750 degrees C and the retention time as selected as 4 h for both methods. The synthesis stages were followed by doping step where the compounds of Cu, Ag and In in different proportions were doped in lithium tetraborate by solid state and solution assisted doping techniques. Characterization of the product was achieved by X-ray diffraction (XRD). Fourier transform Infra Red Spectroscopy (FT-IR) and Scanning Electron Microscopy (SEM) techniques. All samples prepared displayed TL response and the best TL signal was obtained from the sample produced by solid state synthesis and doped by solution assisted method with 0.1% Cu and 0.004% Ag. (C) 2010 Elsevier B.V. All rights reserved.
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    Article
    Citation - WoS: 6
    Citation - Scopus: 8
    Potential of Removing Trace Elements From a Turkish Lignite
    (Taylor & Francis inc, 2010) Ozbayoglu, Gulhan
    Lignite is a significant source for producing electricity in Turkey. However, the hazardous trace elements content, namely, vanadium (V), chromium (Cr), copper (Cu), arsenic (As), thorium (Th), and uranium (U), are much higher than those observed around the world. In this article, the potential of removing the trace elements from the Lignite obtained from the Soma mine using the gravity separation principles is discussed. The float-sink studies conducted using heavy liquid of 1.3 and 1.9 specific gravities identified that removal of the trace elements from the Soma lignite ranged from 15% to 83%.
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    Conference Object
    Citation - Scopus: 2
    Comparison of Gross Calorific Value Estimation of Turkish Coals Using Regression and Neural Networks Techniques
    (2012) Ozbayoglu,A.M.; Ozbayoglu,M.E.; Ozbayoglu,G.
    Gross calorific value (GCV) of coals was estimated using artificial neural networks, linear and non-linear regression techniques. Proximate and ultimate analysis results were collected for 187 different coal samples. Different input data sets were compared, such as both proximate and ultimate analysis data, and only proximate analysis data and only ultimate analysis data. It was observed that the best results were obtained when both proximate analysis and ultimate analysis results were used for estimating the gross calorific value. When the performance of artificial neural networks and regression analysis techniques were compared, it was observed that both artificial neural networks and regression techniques were promisingly accurate in estimating gross calorific values. In general, most of the models estimated the gross calorific value within ±3% of the expected value.
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    Conference Object
    Maghemite - a Source of Heavy Medium for Coal Washeries
    (2010) Arol,A.; Ozbayoglu,G.; Anaç,S.; Bulut,M.
    Use of magnetite as heavy medium in coal preparation plants has been increasing steadily in recent years. It might be in short supply in some areas or excessively costly in certain times. In Turkey, the cost of heavy medium magnetite has almost tripled since 2003. As a result, alternative sources of heavy medium material have been evaluated. A maghemite ore from Elbistan-Kahramanmaras was found to be an interesting source. Tests showed that the maghemite ore can be enriched via magnetic separation at 1556 gauss to obtain a heavy medium material with 4.93 g/cm3 density and 97.22 per cent magnetic recovery. Further tests were conducted to determine the optimum fi eld strength for magnetic separation, friability and regeneration recovery.