Enhancing low-temperature ethanol-selective catalytic reduction over Ag/TiO2-cordierite catalysts via cerium addition
Enhancing low-temperature ethanol-selective catalytic reduction

Resitoglu, Ibrahim Aslan

The purpose of this study is to investigate the NOx reduction activity of Ag/TiO2-Cordierite catalysts enhanced with cerium (Ce) under varying operational temperatures and engine loads. The aim is to improve the low-temperature activity of the catalyst in an ethanol-selective catalytic reduction system using real exhaust gases. During the catalyst production process, Ag and Ce were used as active components, TiO2 as the secondary support material, and cordierite as the primary carrier structure material. Catalysts with 1 wt%, 3 wt%, and 5 wt% Ce-doped Ag/TiO2/Cordierite were synthesized using the washcoating method and characterized through X-Ray Diffraction, Brunauer-Emmett-Teller analysis, and Scanning Electron Microscopy (SEM). Performance test results demonstrated that the NOx conversi...

The effects of Fe2O3 based DOC and SCR catalyst on the exhaust emissions of diesel engines

Resitoglu, Ibrahim Aslan

The effects of Fe2O3 based DOCs (Diesel Oxidation Catalyst) and SCR (Selective Catalytic Reduction) catalysts on the exhaust emissions of diesel engine were investigated in this experimental study. The investigated catalysts, Al2O3 - TiO2/CeO2/Fe2O3 (ATCF) and Al2O3- Nb2O5/CeO2/Fe2O3 (ANCF), were produced with impregnation method and aged for 6 h at 600 degrees C. FE-SEM (Field Emission Scanning Electron Microscopy), XRD (X-Ray Diffraction), XRF (X-Ray Fluorescence) and BET (Brunauer-Emmett-Teller) Surface Area analyzes were carried out to determine the specifications of catalysts. The catalytic performances of the DOCs were tested for the oxidation of CO, HC, PM, NO while SCR catalysts were tested for SCR of NOx using NH3. An individual exhaust system was built up and mounted to the engin...

Development of Fe2O3 based catalysts to control pollutant emissions in diesel engines

Resitoglu, Ibrahim Aslan | Yıldırımcan, Saadet

Exhaust after treatment systems have become a necessity to eliminate pollutant emissions as required by standard. Nowadays, DOC and SCR are widely used after treatment technologies in diesel vehicles. In this experimental study carried on DOC and SCR systems, two different catalysts as Al2O3-TiO2/Fe2O3 and Al2O3-Pt/Fe2O3 were produced with impregnation method. The catalysts were characterized by Field Emission-Scanning Electron Microscope (FE-SEM), X-ray diffraction (XRD), X-ray fluorescence (XRF) and Brauner-Emmett-Teller (BET). Each catalyst was tested as DOC and SCR in real working state to see the effect of catalyst on pollutant emissions in diesel engine. Results showed that the use catalysts as DOC led to significant decrease in CO, HC, NO and smoke emissions. The exhaust temperature...

Hydrogen applications in selective catalytic reduction of NOx emissions from diesel engines

Resitoglu, Ibrahim Aslan

Diesel engines have been considered as a major source in nitrogen oxide (NOx) formation worldwide. The widespread use of diesel engines in consequence of their low fuel consumption, high durability and efficiency increases NOx emissions day by day. NOx emissions from diesel engines cause unavoidable damage on environment and people health. Although so many technologies such as exhaust gas recirculation (EGR), lean burn combustion, electronic controlling fuel injection systems, etc. have been developed to control NOx emissions from diesel engines, they couldn't meet the desired reduction in NOx emissions. In any case, Selective Catalytic Reduction (SCR) as one of the most promising aftertreatment-emission control technologies is an effective solution in restriction of NOx emissions. Th...

Stratification strength and light climate explain variation in chlorophyll a at the continental scale in a European multilake survey in a heatwave summer

Alp, Mehmet Tahir

To determine the drivers of phytoplankton biomass, we collected standardized morphometric, physical, and biological data in 230 lakes across the Mediterranean, Continental, and Boreal climatic zones of the European continent. Multilinear regression models tested on this snapshot of mostly eutrophic lakes (median total phosphorus [TP] = 0.06 and total nitrogen [TN] = 0.7 mg L−1), and its subsets (2 depth types and 3 climatic zones), show that light climate and stratification strength were the most significant explanatory variables for chlorophyll a (Chl a) variance. TN was a significant predictor for phytoplankton biomass for shallow and continental lakes, while TP never appeared as an explanatory variable, suggesting that under high TP, light, which partially controls stratification streng...

Hydropower's Role in Enhancing Energy Justice: Preliminary Insights from the EU and Turkey

Telli, Azime | Kırışık, Avnihan

This study examines recent energy transition policies and the conceptual framework of energy justice, emphasizing the role of hydropower, in ensuring the equitable distribution of energy services and burdens. The analysis focuses on the EU’s energy mix, highlighting the capacity of hydropower and its impact on energy justice, and examines the relationship between migration and energy poverty in countries such as Poland, the Czech Republic and Turkey. In addition to their role as a source of renewable energy, hydropower offer a range of other benefits, including irrigation, flood control, water supply and fisheries. Despite these benefits, the construction of dams can also give rise to several social impacts, including environmental degradation, displacement of local communities and disrupt...

SINIF ÖĞRETMENLERİNİN DOĞAYLA İLİŞKİ VE ÇEVRE BİLİNÇ DÜZEYLERİ ARASINDAKİ İLİŞKİNİN İNCELENMESİ
Examination Of The Relationship Between Primary School Teachers' Nature Relatedness And Environmental Consciousness

Onbaşılı, Ümit İzgi

Bu araştırma 2020-2021 öğretim yılı Mersin merkez ilçelerinde (Akdeniz, Mezitli, Toroslar, Yenişehir) görev yapan sınıf öğretmenlerinin doğayla ilişki ve çevre bilinç düzeyleri arasındaki ilişkinin incelenmesi amacıyla yapılmıştır. Araştırmada nicel araştırma yöntemlerinden tarama modeli kullanılmıştır. Veri toplama aracı olarak; Nisbet ve arkadaşları tarafından 2009 yılında geliştirilip Çakır ve diğerleri tarafından (2015) Türkçeye uyarlaması gerçekleştirilen Doğayla İlişki Ölçeği ve Şaşmaz Ören ve diğerleri (2010) tarafından geliştirilen Çevre Bilincine Sahip Öğretmen Nitelikleri Ölçeği kullanılmıştır. Araştırmanın örneklemini uygun örnekleme yöntemi kullanılarak seçilen Mersin ili merkez ilçelerindeki MEB e bağlı devlet okullarında görev yapan 345 sınıf öğretmeni oluşturmuştur. Araştırm...

SOSYAL PSİKOLOJİ VE DİJİTALLEŞME İLİŞKİSİNE APOKALİPTİK DİSTOPYA ÜZERİNDEN BİR YAKLAŞIM: AVENUE 5 DİZİSİ

Yegen, Ceren

Bilim kurgu türde sıkça gözlenen distopya, teması ve kurgusu çerçevesindeki alt bağlamıyla bir eleştiridir. Karamsarlık, olumsuzluk üzerinden bir hikâye anlatan ya da (olası) görünüm sunan distopik medya çıktıları toplumun, sistemin bulunduğu ya da vardığı noktayı korku, panik gibi argümanlar üzerinden yordadığı gibi zaman zaman absürtlükler üzerinden de yordar. Distopik evrenin yarattığı gelecek apokaliptik ve post-apokaliptik nitelikler taşır. Teknoloji ile yaratılan sona ilişkin çıkış yolu, kurtulma aracı da yine teknolojidir. Diyalektik görünen bu ilişki, zaman zaman fantazmagorik anlatıları da kullanır. Nitekim bazı distopik medya çıktılarında aldatıcı görüntüler, sonu gelen ya da gelmiş olan evrende olan biteni hakikat algısını sorgulatarak verir; distopazlar, otoriter karakterler di...

Metal-based additives "acetylferrocene and ruthenium polypyridyl complex" to improve performance and emission characteristics of ci engine

Resitoglu, Ibrahim Aslan

Metal-based fuel additives have been promising alternative choice to improve diesel engine performance and emission characteristics. Many studies have been performed on use of metal-based fuel additives such as magnesium, platinum, titanium, and cerium in diesel engine. Unlike conventional metal-based additives, Acetylferrocene and Ruthenium polypyridyl complex may be alternative metal-based additives for diesel. This study intends to investigate performance and emission variations of a diesel engine powered by diesel blended with Acetylferrocene and Ruthenium polypyridyl complex additives. In accordance with this purpose, a single cylinder, direct injection diesel engine was used to test these alternative metal additives. Results showed that Acetylferrocene and Ruthenium polypyridyl compl...

119Sn Element-Specific Phonon Density of States of BaSnO3

Erat, Selma | Aycibin, Murat

Vibration spectroscopy is routinely used in analytical chemistry for molecular speciation. Less common is its use in studying the dynamics of reaction and transport processes. A shortcoming of vibration spectroscopies is that they are not inherently specific to chemical elements. Progress in synchrotron radiation-based X-ray technology has developed nuclear resonance vibration spectroscopy (NRVS), which can be used to produce element-specific vibration spectra and partial vibrational density of states (PVDOS), provided the material under investigation contains a Mössbauer-active element. While the method has been recently used successfully for protein spectroscopy, fewer studies have been conducted for condensed matter. We have employed NRVS on the BaSnO3 perovskite structure, which...

Solution-Processable Growth and Characterization of Dandelion-like ZnO:B Microflower Structures

Yıldırımcan, Saadet | Erat, Selma | Çetinkaya, Samed

Intrinsic and dandelion-like microflower nano-rod structures of boron-doped ZnO thin films were synthesized with an ecofriendly and cost-effective chemical bath deposition technique from an aqueous solution of zinc nitrate hexahdyrate [Zn(NO3)2.6H2O] as a precursor solution and boric acid as a doping solution. The boron concentrations were 0.1, 0.3, 0.5, 1.0, 3.0, 5.0, and 7.0 by volume. Scanning electron micrographs showed that doping with boron appears to hinder the vertical alignment of crystallites. Additionally, independent hexagonal nano-rod structures were observed to coalesce together to form dandelion-like structures on the film’s surface. The atomic ratio of the elements was determined via the X-ray photoemission spectrum technique. There were no substantial changes in th...

Exploring pre-service teachers’ experiences of engaging in sustainable environment: a Turkey-Italy eTwinning Project
COMPROMISO EN SOSTENIBILIDAD POR PARTE DE DOCENTES EN FORMACIÓN: UN PROYECTO eTWINNING ENTRE TURQUÍA E ITALIA

Onbaşılı, Ümit İzgi

The research initially delves into the outcomes of an international eTwinning project focused on heightening awareness among future primary school teachers about the causes and consequences of climate change within the framework of sustainable environmental education1 . Employing qualitative research methodologies, the investigation took the form of a case study. The participant group consisted of 13 pre-service teachers studying at Mersin and Balıkesir Universities in Turkey as well as the University of Palermo in Italy in the academic year 2021- 2022. Researchers utilized a semi-structured interview format crafted specifically for the study. The objectives encompassed enhancing the understanding of pre-service teachers regarding sustainable environmental education, fostering their famili...

Mersin sahilinde Dağılımı Bulunan Ulva rigida (C. Agardh 1823)'nın Yağ Asidi Profilinde Bölge Farklılıklarına Bağlı Değişimler

Alp, Mehmet Tahir | Börekçi, Nahit Soner | Ayas, Deniz

Çalışmada kullanılan Ulva rigida örnekleri Mersin sahilinin farklı noktalarından (1. istasyon; Çamlıbel, 2. istasyon; Karaduvar, 3. istasyon; Marina, 4. istasyon; Hilton) 2016 yılında ilkbahar mevsiminde toplanmıştır. U. rigida’nın toplam yağ ve yağ asidi düzeyleri belirlenmiştir. Toplam yağ düzeyi için sırasıyla 1. istasyon %0.87, 2. istasyon %1.03, 3. istasyon %0.41, 4. istasyon %4.99 olarak bulunmuştur. Dominant doymuş yağ asitleri (SFA) palmitik asit ve stearik asittir. Palmitik asidin en yüksek düzeyi 4. istasyon örneklerinde %40.64, en düşük düzeyi ise 1. istasyon örneklerinde %27.78 olarak bulunmuştur. Stearik asidin en yüksek düzeyi 4. istasyon örneklerinde %12.49, en düşük düzeyi 2. istasyon örneklerinde %2.71 olarak bulunmuştur. ΣSFA düzeyi istasyonlarda sırası ile %36.47, %41.32...

A hybrid MCDM approach for optimizing fuel consumption and mitigating air pollution in shipping: A case study using DEMATEL and ANP

Fuel consumption represents a pivotal factor in determining operational costs within maritime transportation, with direct implications for energy efficiency, environmental sustainability, and air pollution. This study aims to identify and evaluate the key determinants influencing fuel consumption, with the objective of optimizing these factors to enhance overall energy efficiency. A Multi-Criteria Decision-Making (MCDM) methodology was employed to systematically rank and prioritize the most significant criteria impacting fuel efficiency. The findings of the study indicate that compliance with sea conditions, optimal ship speed and the expertise of shipmasters (C3.2) are the most influential factors, followed by voyage planning that accounts for sea and weather conditions (C3.7). Thes...

Assessment of the detection efficiency calibration of high-resolution gamma-ray spectrometers by EGSnrc and MCNP6.2 Monte Carlo codes

Sayın, Sefa

Determination of the activity content of radionuclides with high accuracy and precision with gamma-ray spectrometry is strongly based on the detection efficiency calibration of the detector. The detector efficiency calibration is determined with standard reference sources and/or Monte Carlo codes. The current study provides methodology that can be used to generate efficiency curve with simulations instead of experiments. As a result, the need for additional experiments can be reduced. The implementation of a specific script written on EGSnrc Monte Carlo code was investigated to calculate the detection efficiency with high-level accuracy for high-purity germanium (HPGe) spectrometry. For this purpose, two HPGe detectors (ORTEC and PGT) used routinely in the activity measurement of gamma emi...

Valorization of loquat seeds by hydrothermal carbonization for the production of hydrochars and aqueous phases as added-value products

Gözmen, Belgin | Görmez, Özkan | Saçlı, Barış | Çalhan Doğan, Selda

In the framework of circular bio-economy, waste loquat seeds were utilized for the production of two addedvalue products. The seeds were hydrothermally carbonized at a temperature range of 150–250 ◦C and time range 2–6 h and the resultant hydrochars and aqueous phases were characterized using various methods. The optimum higher heating value of 30.64 MJ kg− 1 , ash content of 1.99 wt % and alkali index of 0.05 were achieved for the hydrochar prepared at 250 ◦C and 6 h, establishing its suitability for energy-related applications. The aqueous phase obtained at 250 ◦C and 6 h achieved 90% scavenging of the 2,2-diphenyl-1-picryl-hydrazyl-hydrate (DPPH) radical and had a IC50 value of 43.71 μg mL− 1 . Principal component analysis showed that the production of phenols, ketones, alkenes a...