Derya Turhan - Academia.edu (original) (raw)
Papers by Derya Turhan
Journal of the Institute of Science and Technology
Çevresel bozulmalar, artan sera gazları, hammaddelerin bilinçsizce ve hızla tüketilmesi gibi soru... more Çevresel bozulmalar, artan sera gazları, hammaddelerin bilinçsizce ve hızla tüketilmesi gibi sorunlar toplumları sürdürülebilir yeşil bina ve inşaat malzemeleri üretmeye zorlamaktadır. Sürdürülebilir kalkınma ve döngüsel ekonominin çevresel ve finansal faydaları büyük ölçüde atıkların yeniden kullanılması, geri dönüştürülmesi veya bertaraf edilmesine bağlıdır. Bu bağlamda geopolimer beton üstün mekanik ve durabilite özellikleri ve birçok atığı öncül olarak kullanma yetenekleri nedeniyle çevre dostu bir malzeme olarak son yıllarda ilgi görmüştür. Düşük karbon ayak izine sahip olması ve uçucu kül, öğütülmüş granül yüksek fırın cürufu gibi endüstriyel yan ürünlerin ve volkanik esaslı küllerin kullanılması, geopolimer betonun (GPC) geleneksel betona sürdürülebilir bir alternatif olmasını sağlar. Katı atık tesislerinde artan inşaat yıkım atıkları ve doğal kaynakların aşırı kullanımı ekolojik denge için endişe verici seviyeye ulaşmıştır. Bu nedenle beton atıkların geri dönüşümü; katı atık...
International Journal of Educational Research
Burnout symptoms are prevalent among university students. This study examined students' understud... more Burnout symptoms are prevalent among university students. This study examined students' understudied profiles of burnout symptoms and their relation to procrastination, dropout intentions, and study-and life satisfaction. We used cross-sectional data from two online-studies conducted in Germany in April 2020 amid the COVID-19 pandemic (N study1 = 597, N study2 = 857). Latent profile analyses indicated three profiles in both studies: (1) well-functioning, (2) moderately exhausted-inefficacious, and (3) burned-out. Most students belonged to Profiles 1 and 2 with low to moderate burnout symptoms. Students in Profile 3 reported the highest symptoms, most procrastination, strongest dropout intentions, and lowest study-and life satisfaction. The distinct profiles broaden knowledge about intra-individual differences in students' burnout experiences and underpin the need for tailored interventions.
Frontiers in Psychology, Aug 22, 2022
understanding that study satisfaction could diminish in the face of challenging situations such a... more understanding that study satisfaction could diminish in the face of challenging situations such as in this pandemic. The present study also highlights certain personal and contextual factors that relate to study satisfaction and calls for intensive research into the multidimensional construct of study satisfaction.
European Journal of Health Psychology, 2021
. Background: Higher education is a challenging context in which students – particularly those en... more . Background: Higher education is a challenging context in which students – particularly those endowed with a small array of resources – are susceptible to suffer from burnout. To screen, identify, and support students that are at risk of burnout, psychometrically robust instruments are essential. To this end, we extended the validation of the German short version of the Maslach Burnout Inventory – Student Survey (MBI-SS-KV) that allows measuring burnout among German-speaking university students. Method: We conducted a longitudinal study and analyzed the factorial validity, reliability, measurement invariance, and convergent as well as discriminant validity of the MBI-SS-KV in a sample of German university students ( N = 1,435). Results: Our results replicated the original three-factor structure of the MBI-SS-KV. Yet, a bi-factor structure of the MBI-SS-KV – composed of a general factor (i.e., student burnout) and three domain-specific factors (i.e., emotional exhaustion, cynicism, and reduced professional efficacy) – revealed a comparable fit and was used for further analyses due to theoretical and methodological advantages. Based on the bi-factor structure of the MBI-SS-KV, nested models with increasing invariance constraints provided support for measurement invariance of this instrument across female and male university students and across time. Besides, the average variance extracted estimates and the comparisons of these estimates with shared variances demonstrated convergent and discriminant validity of the factors emotional exhaustion and cynicism, but not for the factor reduced professional efficacy. Conclusion: To sum up, we found that the MBI-SS-KV is a reliable and for the most part valid instrument for the assessment of student burnout in German higher education.
Geopolymer, Perlite, Red Mud, Elevated temperature, Acid effect, Sulfate effect, Freeze-thaw, Sus... more Geopolymer, Perlite, Red Mud, Elevated temperature, Acid effect, Sulfate effect, Freeze-thaw, Sustainability, Global warm Due to the increasing CO2 emission resulting from cement production in recent years, researchs on the use of alternative binders to cement have increased and one of the most important binders have become geopolymer binders. Many different natural or waste materials are used as alumino-silicate sources in geopolymer production. In this study, the production of geopolymer concrete with perlite (a natural source of alumino-silicate) and red mud (a waste material) were investigated. Red mud was utilized at 10%, 20%, and 30% of the total mass of binder. In the mixtures, the solution/binder and NaOH/Na2SO3 ratios were selected as 0.50 and 1/1, and the produced samples were cured at 90°C for 72 hours. After heat curing, 3, 7, 28, and 90 days’ compressive strengths of all mixtures were determined. In addition, the samples from each mixture were exposed to 5% HCl and 5% M...
Journal of the Institute of Science and Technology
Çevresel bozulmalar, artan sera gazları, hammaddelerin bilinçsizce ve hızla tüketilmesi gibi soru... more Çevresel bozulmalar, artan sera gazları, hammaddelerin bilinçsizce ve hızla tüketilmesi gibi sorunlar toplumları sürdürülebilir yeşil bina ve inşaat malzemeleri üretmeye zorlamaktadır. Sürdürülebilir kalkınma ve döngüsel ekonominin çevresel ve finansal faydaları büyük ölçüde atıkların yeniden kullanılması, geri dönüştürülmesi veya bertaraf edilmesine bağlıdır. Bu bağlamda geopolimer beton üstün mekanik ve durabilite özellikleri ve birçok atığı öncül olarak kullanma yetenekleri nedeniyle çevre dostu bir malzeme olarak son yıllarda ilgi görmüştür. Düşük karbon ayak izine sahip olması ve uçucu kül, öğütülmüş granül yüksek fırın cürufu gibi endüstriyel yan ürünlerin ve volkanik esaslı küllerin kullanılması, geopolimer betonun (GPC) geleneksel betona sürdürülebilir bir alternatif olmasını sağlar. Katı atık tesislerinde artan inşaat yıkım atıkları ve doğal kaynakların aşırı kullanımı ekolojik denge için endişe verici seviyeye ulaşmıştır. Bu nedenle beton atıkların geri dönüşümü; katı atık...
International Journal of Educational Research
Burnout symptoms are prevalent among university students. This study examined students' understud... more Burnout symptoms are prevalent among university students. This study examined students' understudied profiles of burnout symptoms and their relation to procrastination, dropout intentions, and study-and life satisfaction. We used cross-sectional data from two online-studies conducted in Germany in April 2020 amid the COVID-19 pandemic (N study1 = 597, N study2 = 857). Latent profile analyses indicated three profiles in both studies: (1) well-functioning, (2) moderately exhausted-inefficacious, and (3) burned-out. Most students belonged to Profiles 1 and 2 with low to moderate burnout symptoms. Students in Profile 3 reported the highest symptoms, most procrastination, strongest dropout intentions, and lowest study-and life satisfaction. The distinct profiles broaden knowledge about intra-individual differences in students' burnout experiences and underpin the need for tailored interventions.
Frontiers in Psychology, Aug 22, 2022
understanding that study satisfaction could diminish in the face of challenging situations such a... more understanding that study satisfaction could diminish in the face of challenging situations such as in this pandemic. The present study also highlights certain personal and contextual factors that relate to study satisfaction and calls for intensive research into the multidimensional construct of study satisfaction.
European Journal of Health Psychology, 2021
. Background: Higher education is a challenging context in which students – particularly those en... more . Background: Higher education is a challenging context in which students – particularly those endowed with a small array of resources – are susceptible to suffer from burnout. To screen, identify, and support students that are at risk of burnout, psychometrically robust instruments are essential. To this end, we extended the validation of the German short version of the Maslach Burnout Inventory – Student Survey (MBI-SS-KV) that allows measuring burnout among German-speaking university students. Method: We conducted a longitudinal study and analyzed the factorial validity, reliability, measurement invariance, and convergent as well as discriminant validity of the MBI-SS-KV in a sample of German university students ( N = 1,435). Results: Our results replicated the original three-factor structure of the MBI-SS-KV. Yet, a bi-factor structure of the MBI-SS-KV – composed of a general factor (i.e., student burnout) and three domain-specific factors (i.e., emotional exhaustion, cynicism, and reduced professional efficacy) – revealed a comparable fit and was used for further analyses due to theoretical and methodological advantages. Based on the bi-factor structure of the MBI-SS-KV, nested models with increasing invariance constraints provided support for measurement invariance of this instrument across female and male university students and across time. Besides, the average variance extracted estimates and the comparisons of these estimates with shared variances demonstrated convergent and discriminant validity of the factors emotional exhaustion and cynicism, but not for the factor reduced professional efficacy. Conclusion: To sum up, we found that the MBI-SS-KV is a reliable and for the most part valid instrument for the assessment of student burnout in German higher education.
Geopolymer, Perlite, Red Mud, Elevated temperature, Acid effect, Sulfate effect, Freeze-thaw, Sus... more Geopolymer, Perlite, Red Mud, Elevated temperature, Acid effect, Sulfate effect, Freeze-thaw, Sustainability, Global warm Due to the increasing CO2 emission resulting from cement production in recent years, researchs on the use of alternative binders to cement have increased and one of the most important binders have become geopolymer binders. Many different natural or waste materials are used as alumino-silicate sources in geopolymer production. In this study, the production of geopolymer concrete with perlite (a natural source of alumino-silicate) and red mud (a waste material) were investigated. Red mud was utilized at 10%, 20%, and 30% of the total mass of binder. In the mixtures, the solution/binder and NaOH/Na2SO3 ratios were selected as 0.50 and 1/1, and the produced samples were cured at 90°C for 72 hours. After heat curing, 3, 7, 28, and 90 days’ compressive strengths of all mixtures were determined. In addition, the samples from each mixture were exposed to 5% HCl and 5% M...