Timuçin Çiçek | Okan University (original) (raw)

Papers by Timuçin Çiçek

Research paper thumbnail of Observation on the age, growth and somatic condition of Carasobarbus luteus (Heckel, 1843) and Capoeta trutta (Heckel, 1843) (Cyprinidae) in the Tigris River, Turkey

Iranian Journal of Fisheries Sciences, 2017

This study was carried out to determine some biological characteristics including age, growth and... more This study was carried out to determine some biological characteristics including age, growth and somatic condition of Carasobarbus luteus and Capoeta trutta in the Turkish part of the Tigris River. The examined samples of C. luteus were distributed between II-IX years of age. The length-weigth relations of females and males were calculated as Log W =-4.7314 +3.0113 Log FL and Log W = -4.7631 +3.0263 Log FL respectively. Von Bertalanffy growth equations were estimated as Lt=40.09 [1-e^-0.087036 (t+1.55004)] for females and Lt=38.14 [1-e^-0.080056 (t+2.34838)] for males. The somatic condition was 1.9667 ± 0.1751 for females and 1.9967 ± 0.4205 for males. The observed samples of C. trutta were distributed between I-VI years of age. The length-weigth relationship of females and males were calculated as Log W = -4.6845 + 2.9303 Log FL, Log W = -4.7784 + 2.9746 Log FL, respectively. Von Bertalanffy growth equations were estimated as Lt=35.36 [1-e^-0.082817 (t+4.82738)] for females and Lt...

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Research paper thumbnail of Applicability of multi-gravity separation to KOP chromite concentration plant

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Research paper thumbnail of The Characteristics of Health Care Workers with COVID-19 and Relationship Between COVID-19 Mortality and BCG/Tuberculosis History: a multi-center study

BackgroundToday, COVID-19 pandemic has brought countries’ health services into sharp focus. Despi... more BackgroundToday, COVID-19 pandemic has brought countries’ health services into sharp focus. Despite the low incidence of cases(1.2%) and high mortality rate(2.4%) among Turkish population, the low mortality rate(0.3%) despite the high incidence(11.5%) declared in healthcare workers drew our group’s attention. Therefore, we aimed to report the characteristics of infected health-care workers and investigate the relationship between BCG vaccine and tuberculosis history with COVID-19 mortality in infected health-care worker population.MethodThis study was conducted in three hospitals to assess the clinical presentations, disease severity and correlation with BCG vaccine and tuberculous history in COVID-19 positive health-care workers by an online questionnaire platform. The relationship between characteristics and tuberculosis history were investigated according to hospitalization status of the patients.ResultTotal of 465 infected healthcare workers included in the study. The rate of hi...

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Research paper thumbnail of Discrimination of Capoeta trutta (Heckel, 1843) and Capoeta umbla (Heckel, 1843) from scales by Geometric Morphometric Methods

Journal of Survey in Fisheries Sciences

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Research paper thumbnail of Morphological differences among the Garra variabilis populations (Cyprinidae) in Tigris River system of South East Turkey

Journal of Survey in Fisheries Sciences

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Research paper thumbnail of New record and range extension of the big-scale sand smeltAtherina boyeriRisso, 1810 (Atherinidae) in the Devegecidi Dam Lake, Tigris River basin, Turkey

Journal of Applied Ichthyology

Summary The big-scale sand smelt, Atherina boyeri, is recorded from the Devegecidi Dam Lake in 20... more Summary The big-scale sand smelt, Atherina boyeri, is recorded from the Devegecidi Dam Lake in 2016, the first record of this invasive species in the Tigris River basin, with potential to extend to all countries in the Middle East. The smelts were caught with a trawl net mesh size of 6 mm. The captured specimens are described and compared. Records of A. boyeri from Turkish inland waters are summarised from the literature.

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Research paper thumbnail of Briquetting Fine Chromite Concentrates

ABSTRACT

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Research paper thumbnail of Bayer- Al(OH)3'in Kalsiyum Aluminat Çimentosu Üretiminde Kullanilabilirliğinin Araştirilmasi

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Research paper thumbnail of Morphological differences among the Cyprinion macrostomus (Cyprinidae) populations in the Tigris River

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Research paper thumbnail of Kömür Biriketleme ve Ülkemizin Yakacak ihtiyacındaki Önemi

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Research paper thumbnail of Use of fly ash in production of light-weight building bricks

Construction and Building Materials, 2015

Abstract Fly ash is one of the coal combustion products (CCPs) of coal burning power plants and i... more Abstract Fly ash is one of the coal combustion products (CCPs) of coal burning power plants and it contains substantial amounts of potentially harmful constituents to the environment. It is known that nearly 600 million tons of fly ash is produced in the world per-annum. In Turkey, the annual production of fly ash is, on average, 13 million tons and only a small amount of this is utilized. This study examines the production of light-weight, high thermal insulating bricks made out of the fly ash and lime. Cylindrical brick samples were produced through steam curing of Seyitomer thermal power plant fly ash and lime mixtures in an autoclave in order to determine the optimum conditions for mechanically sound bricks. Subsequently, at the optimum conditions determined, real-size bricks were produced and subjected to standard tests. The findings of this paper suggest that fly ash/lime bricks can be an alternative product to aerated cellular concrete.

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Research paper thumbnail of Investigation of Heavy Media Separation Conditions of Soma-Eynez Coal Soma-Eynez Kömürünün Ağır Ortamla Yıkanma Şartlarının İncelenmesi

In this study, the conditions of heavy media separation of Soma-Eynez coal, which is mined by the... more In this study, the conditions of heavy media separation of Soma-Eynez coal, which is mined by the Hüstaş Mining Com¬pany, are investigated. For this purpose, a se¬ries of separation tests were conducted using a pilot scale heavy media separation drum. Based on the obtained upgrading results the washability of the test coal is evaluated. Fur¬thermore, for different clean coal qualities, the expected upgrading results are computed un¬der consideration of the actual test results.

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Research paper thumbnail of Study on Efem Cukuru Gold Ore Deposit and Recovery of Gold by Flotation

Asian Journal of Chemistry

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Research paper thumbnail of An efficient process for the beneficiation of a low grade chromite ore

Mineral Processing and Extractive Metallurgy, 2010

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Research paper thumbnail of Technical and economical applicability study of centrifugal force gravity separator (MGS) to Kef chromite concentration plant

Mineral Processing and Extractive Metallurgy, 2008

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Research paper thumbnail of Daha önce geçirilen açık cerrahinin perkütan nefrolitotomi sonuçları üzerine etkileri

Türk Üroloji Dergisi, 2009

... Percutaneous nephrolithotomy in patients who previously underwent open nephrolithotomy. J End... more ... Percutaneous nephrolithotomy in patients who previously underwent open nephrolithotomy. J Endourol 2005;19:1161-4. 6. Tuğcu V, Su FE, Kalfazade N, Şahin S, Özbay B, Taşçı AI. ... J Endourol 2006;20:17-20. Yazışma (Correspondence): Dr. Murat Gönen. ...

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Research paper thumbnail of Investigation into Utilization of Bayer- Al(OH) 3 in Production of Calcium Aluminate Cements

Key Engineering Materials - KEY ENG MAT, 2004

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Research paper thumbnail of Range extension of the exotic Indian stinging catfish, Heteropneustes fossilis (Bloch, 1794) (Heteropneustidae) into the Turkish part of the Tigris River watershed

Journal of Applied Ichthyology, 2011

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Research paper thumbnail of An Efficient Process for Recovery of Fine Coal from Tailings of Coal Washing Plants

Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2008

Gravity concentration of hard lignites using conventional jigs and heavy media separation equipme... more Gravity concentration of hard lignites using conventional jigs and heavy media separation equipment is prone to produce coal-rich fine tailings. This study aims to establish a fine coal recovery process of very high efficiency at reasonable capital investment and operational costs. The technical feasibility to upgrade the properties of the predeslimed fine refuse of a lignite washing plant with 35.9%

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Research paper thumbnail of Applicability of Mozley multigravity separator (MGS) to fine chromite tailings of Turkish chromite concentrating plants

Minerals engineering, 2002

The total amount of fine chromite gravity tailings in Turkey is around 3,000,000 tons with a quit... more The total amount of fine chromite gravity tailings in Turkey is around 3,000,000 tons with a quite high Cr2O3 content of about 9–20%. These fines are produced as a result of the inefficiency of conventional separation equipment at fine particle size due to finely grained ...

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Research paper thumbnail of Observation on the age, growth and somatic condition of Carasobarbus luteus (Heckel, 1843) and Capoeta trutta (Heckel, 1843) (Cyprinidae) in the Tigris River, Turkey

Iranian Journal of Fisheries Sciences, 2017

This study was carried out to determine some biological characteristics including age, growth and... more This study was carried out to determine some biological characteristics including age, growth and somatic condition of Carasobarbus luteus and Capoeta trutta in the Turkish part of the Tigris River. The examined samples of C. luteus were distributed between II-IX years of age. The length-weigth relations of females and males were calculated as Log W =-4.7314 +3.0113 Log FL and Log W = -4.7631 +3.0263 Log FL respectively. Von Bertalanffy growth equations were estimated as Lt=40.09 [1-e^-0.087036 (t+1.55004)] for females and Lt=38.14 [1-e^-0.080056 (t+2.34838)] for males. The somatic condition was 1.9667 ± 0.1751 for females and 1.9967 ± 0.4205 for males. The observed samples of C. trutta were distributed between I-VI years of age. The length-weigth relationship of females and males were calculated as Log W = -4.6845 + 2.9303 Log FL, Log W = -4.7784 + 2.9746 Log FL, respectively. Von Bertalanffy growth equations were estimated as Lt=35.36 [1-e^-0.082817 (t+4.82738)] for females and Lt...

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Research paper thumbnail of Applicability of multi-gravity separation to KOP chromite concentration plant

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Research paper thumbnail of The Characteristics of Health Care Workers with COVID-19 and Relationship Between COVID-19 Mortality and BCG/Tuberculosis History: a multi-center study

BackgroundToday, COVID-19 pandemic has brought countries’ health services into sharp focus. Despi... more BackgroundToday, COVID-19 pandemic has brought countries’ health services into sharp focus. Despite the low incidence of cases(1.2%) and high mortality rate(2.4%) among Turkish population, the low mortality rate(0.3%) despite the high incidence(11.5%) declared in healthcare workers drew our group’s attention. Therefore, we aimed to report the characteristics of infected health-care workers and investigate the relationship between BCG vaccine and tuberculosis history with COVID-19 mortality in infected health-care worker population.MethodThis study was conducted in three hospitals to assess the clinical presentations, disease severity and correlation with BCG vaccine and tuberculous history in COVID-19 positive health-care workers by an online questionnaire platform. The relationship between characteristics and tuberculosis history were investigated according to hospitalization status of the patients.ResultTotal of 465 infected healthcare workers included in the study. The rate of hi...

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Research paper thumbnail of Discrimination of Capoeta trutta (Heckel, 1843) and Capoeta umbla (Heckel, 1843) from scales by Geometric Morphometric Methods

Journal of Survey in Fisheries Sciences

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Research paper thumbnail of Morphological differences among the Garra variabilis populations (Cyprinidae) in Tigris River system of South East Turkey

Journal of Survey in Fisheries Sciences

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Research paper thumbnail of New record and range extension of the big-scale sand smeltAtherina boyeriRisso, 1810 (Atherinidae) in the Devegecidi Dam Lake, Tigris River basin, Turkey

Journal of Applied Ichthyology

Summary The big-scale sand smelt, Atherina boyeri, is recorded from the Devegecidi Dam Lake in 20... more Summary The big-scale sand smelt, Atherina boyeri, is recorded from the Devegecidi Dam Lake in 2016, the first record of this invasive species in the Tigris River basin, with potential to extend to all countries in the Middle East. The smelts were caught with a trawl net mesh size of 6 mm. The captured specimens are described and compared. Records of A. boyeri from Turkish inland waters are summarised from the literature.

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Research paper thumbnail of Briquetting Fine Chromite Concentrates

ABSTRACT

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Research paper thumbnail of Bayer- Al(OH)3'in Kalsiyum Aluminat Çimentosu Üretiminde Kullanilabilirliğinin Araştirilmasi

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Research paper thumbnail of Morphological differences among the Cyprinion macrostomus (Cyprinidae) populations in the Tigris River

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Research paper thumbnail of Kömür Biriketleme ve Ülkemizin Yakacak ihtiyacındaki Önemi

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Research paper thumbnail of Use of fly ash in production of light-weight building bricks

Construction and Building Materials, 2015

Abstract Fly ash is one of the coal combustion products (CCPs) of coal burning power plants and i... more Abstract Fly ash is one of the coal combustion products (CCPs) of coal burning power plants and it contains substantial amounts of potentially harmful constituents to the environment. It is known that nearly 600 million tons of fly ash is produced in the world per-annum. In Turkey, the annual production of fly ash is, on average, 13 million tons and only a small amount of this is utilized. This study examines the production of light-weight, high thermal insulating bricks made out of the fly ash and lime. Cylindrical brick samples were produced through steam curing of Seyitomer thermal power plant fly ash and lime mixtures in an autoclave in order to determine the optimum conditions for mechanically sound bricks. Subsequently, at the optimum conditions determined, real-size bricks were produced and subjected to standard tests. The findings of this paper suggest that fly ash/lime bricks can be an alternative product to aerated cellular concrete.

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Research paper thumbnail of Investigation of Heavy Media Separation Conditions of Soma-Eynez Coal Soma-Eynez Kömürünün Ağır Ortamla Yıkanma Şartlarının İncelenmesi

In this study, the conditions of heavy media separation of Soma-Eynez coal, which is mined by the... more In this study, the conditions of heavy media separation of Soma-Eynez coal, which is mined by the Hüstaş Mining Com¬pany, are investigated. For this purpose, a se¬ries of separation tests were conducted using a pilot scale heavy media separation drum. Based on the obtained upgrading results the washability of the test coal is evaluated. Fur¬thermore, for different clean coal qualities, the expected upgrading results are computed un¬der consideration of the actual test results.

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Research paper thumbnail of Study on Efem Cukuru Gold Ore Deposit and Recovery of Gold by Flotation

Asian Journal of Chemistry

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Research paper thumbnail of An efficient process for the beneficiation of a low grade chromite ore

Mineral Processing and Extractive Metallurgy, 2010

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Research paper thumbnail of Technical and economical applicability study of centrifugal force gravity separator (MGS) to Kef chromite concentration plant

Mineral Processing and Extractive Metallurgy, 2008

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Research paper thumbnail of Daha önce geçirilen açık cerrahinin perkütan nefrolitotomi sonuçları üzerine etkileri

Türk Üroloji Dergisi, 2009

... Percutaneous nephrolithotomy in patients who previously underwent open nephrolithotomy. J End... more ... Percutaneous nephrolithotomy in patients who previously underwent open nephrolithotomy. J Endourol 2005;19:1161-4. 6. Tuğcu V, Su FE, Kalfazade N, Şahin S, Özbay B, Taşçı AI. ... J Endourol 2006;20:17-20. Yazışma (Correspondence): Dr. Murat Gönen. ...

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Research paper thumbnail of Investigation into Utilization of Bayer- Al(OH) 3 in Production of Calcium Aluminate Cements

Key Engineering Materials - KEY ENG MAT, 2004

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Research paper thumbnail of Range extension of the exotic Indian stinging catfish, Heteropneustes fossilis (Bloch, 1794) (Heteropneustidae) into the Turkish part of the Tigris River watershed

Journal of Applied Ichthyology, 2011

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Research paper thumbnail of An Efficient Process for Recovery of Fine Coal from Tailings of Coal Washing Plants

Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2008

Gravity concentration of hard lignites using conventional jigs and heavy media separation equipme... more Gravity concentration of hard lignites using conventional jigs and heavy media separation equipment is prone to produce coal-rich fine tailings. This study aims to establish a fine coal recovery process of very high efficiency at reasonable capital investment and operational costs. The technical feasibility to upgrade the properties of the predeslimed fine refuse of a lignite washing plant with 35.9%

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Research paper thumbnail of Applicability of Mozley multigravity separator (MGS) to fine chromite tailings of Turkish chromite concentrating plants

Minerals engineering, 2002

The total amount of fine chromite gravity tailings in Turkey is around 3,000,000 tons with a quit... more The total amount of fine chromite gravity tailings in Turkey is around 3,000,000 tons with a quite high Cr2O3 content of about 9–20%. These fines are produced as a result of the inefficiency of conventional separation equipment at fine particle size due to finely grained ...

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