Yazarlar
- Bulut, H. Alperen(11)
- Ertugay, Neşe(6)
- Gürses, Ahmet(6)
- Manga, Muge(6)
- Aka, Salih(5)
- Baş, Fatih İrfan(5)
- Destek, Mehmet Akif(5)
- Yavuz, Emre(5)
- Akoğuz, Harun(4)
- Akşit, Zeynep(4)
- Caglar, Bulent(4)
- Demirci, Oğuz Kürşat(4)
- Kandil, Ufuk(4)
- Kocakaplan, Nihal(4)
- Kumbasaroglu, Atila(4)
- Malkoç, Emine(4)
- Akın, Fatih(3)
- Açikyildiz, Metin(3)
- Bayata, Halim Ferit(3)
- Bayrak, Osman Ünsal(3)
- Dede, Tayfun(3)
- Doğan, Bilge(3)
- Doǧar, Çetin(3)
- El Nemr, Ahmed(3)
- Ertugay, Nese(3)
- Gençcelep, Hüseyin(3)
- Güner, Eda Keleş(3)
- Jagan, J.(3)
- Keleş, Ömer Faruk(3)
- Samui, Pijush(3)
- Turan, Ahmet İhsan(3)
- Ulusu, Hayati(3)
- Ulusu, İsmet(3)
- Yalciner, Hakan(3)
- Yavuz, Sevtap Caglar(3)
- Yılmaz, Mehmet(3)
- Çolak, Muhammed Ali(3)
- Özdemir, Agah Oktay(3)
- Şahin, Remzi(3)
- Acar, Filiz Nuran(2)
Yayınlar
- ArticleAçık Erişim2023Kaolin Yüzeyine Dekore Edilmiş Bakır Katkılı Çinko Oksit Nanokompoziti Kullanılarak Reaktif Mavi 21 Tekstil Boyar Maddesinin Adsorpsiyonu, Kinetiği ve Termodinamiği
Caglar, Bulent; Güner, Eda Keles; Doğan, Bilge; Özdemir, Agah Oktay
Bu çalışmanın amacı; tekstil endüstrisinde yaygın olarak kullanılan bir boyarmadde olan Reaktif Mavi 21 (RM21)’in atık sulardan adsorpsiyon yöntemiyle uzaklaştırılmasında kaolin yüzeyine dekore edilmiş bakır katkılı çinko oksit nanokompozitinin adsorban olarak kullanılabilirliğinin araştırılmasıdır. Adsorpsiyon üzerine, başlangıç RM21 konsantrasyonu, adsorban miktarı, sıcaklık ve denge süresi gibi çeşitli deneysel parametrelerin etkileri incelenmiştir. Adsorpsiyon hızının ikinci mertebeden hız ifadesine uyduğu ve kaolin yüzeyine dekore edilmiş bakır katkılı çinko oksit nanokompozitinin RM21 üzerine adsorpsiyonunun Redlich-Peterson izoterm modeliyle uyum sağladığı görülmüştür. Bu çalışmanın sonuçları, RM21’nin sulu çözeltilerden uzaklaştırılmasında kaolin yüzeyine dekore edilmiş bakır katkılı çinko oksit nanokompozitinin etkili bir adsorban olarak kullanılabileceğini göstermiştir.
RDL Kalıcı Kaydıİncele - ArticleAçık Erişim2023Microwave-Assisted Fabrication of Pd, Co and Ni Nanoparticles Modified-SiO2; as Catalysts in the Reduction Reaction of Organic Pollutants
Dayan, Serkan; Yavuz, Sevtap Çaglar; Yavuz, Emre
Nanomaterials have been used in catalytic degradation of organic pollutants also act as catalysts in for many years. Due to excellent catalytic performances of metal-based nanoparticles, these materials have been used extensively in various hybrid catalyst synthesis. The main subject of this study, heterogeneous catalysis is a low cost and multi-purpose process for many pollutants. Catalytic degradation of organic pollutants such as; 2-nitrophenol, quinolin yellow and rhodamine B was investigated by using Ni, Co, Pd nanoparticles modified SiO2 based nanomaterials. The co-doping effect on the prepared nanomaterials has been investigated with different characterization methods in terms of structural and morphological features: scanning electron microscopy, UV/vis absorption spectroscopy, energy-dispersive X-ray spectroscopy and foruier-transform infrared spectroscopy. The highest catalytic reduction efficiencies (97.6% and 97.5%) for 2-nitrophenol and rhodamine B was obtained by Pd-PEG-AP@SiO2 respectively. The synthesized Co-PEG-AP@SiO2 illustrated higher catalytic reduction efficiency for quinolin yellow (70.1%) at the end of 60s. The prepared M-PEG-AP@SiO2 nanomaterial (M: Pd,Co,Ni) can be able to utilized degradation of organic contaminants effectively.
RDL Kalıcı Kaydıİncele - ArticleAçık Erişim2023Evaluation of energy and nutrient content of fruit juices and similar beverages in Türkiye and their investigation in terms of sustainability
Özenir, Çiler; Kaçar, Mihrican; Berk, Gizem; Kayhan, Beyza
This study aims to evaluate the contents of fruit juices and similar beverages in the Turkish market and to examine them in line with the Sustainable Development Goals. Within the scope of the study, the researchers examined the label information of 187 fruit juices and similar beverages from 26 different brands in four different product types. It was determined that all fruit nectars (100%) and almost all fruit and flavored beverages contain added sugar (92.8% for fruit beverages and 70.0% for flavored beverages). It was further detected that 17.5% of fruit nectars and 20.3% of fruit beverages contain sweeteners. Moreover, more than 100% of the daily sodium requirement is met by consuming 100 ml of fruit juice, nectar, or beverages. It was determined that orange and apple juices, apricot, peach, and cherry fruit nectars, and peach, sour cherry, and orange fruit beverages contain more sugar than freshly squeezed fruit juices (p<0.05). The high-fructose syrup manufacturing industry produces large volumes of waste liquid containing various waste carbohydrates, which has a significant environmental impact. Greenhouse gas emission sources are also released to the environment in sugar production processes. On the other hand, it was determined that most of the products examined were packaged in Tetra Pak® packaging. More sustainable product supply chains are those that optimize the use of materials, water, and energy throughout their lifecycle while minimizing waste from products and used packaging. In light of the data obtained from this study, it would be useful for the fruit juice industry to make regulations to ensure sustainable production and consumption patterns in order to ensure a healthy and quality life at all ages.
RDL Kalıcı Kaydıİncele - Review ArticleAçık Erişim2023Katı atık yönetimi: balıkesir büyükşehir belediyesi örneği
Ekinci, Elif; Bilgin, Hande
Atık yönetimleri, tüm ülkelerin çevre politikaları içerisinde önemli bir yer edinmiştir. Katı atık yönetimleri ve çevre koruma faaliyetleri ülkelerin ekonomik, siyasi ve sosyal durumlarına göre farklılık arz etmektedir. Dünya hızla kentleşmekte ve artan nüfus; daha fazla üretim yapılması daha fazla doğal kaynağın kullanılması anlamına gelmektedir. Artan tüketim sonucu katı atık oranı da çoğalmaktadır. Belediyeler, yerel halkını, katı atıklardan ve çevre sorunlarından korumakla yükümlüdür.Çalışmanın ilk bölümünde kavramsal çerçeve başlığı altında katı atık yönetimi ve çeşitlerinden, entegre katı atık yönetimi ve sürdürülebilir katı atık yönetiminden bahsedilecektir. İkinci bölümde Türkiye’ de katı atık yönetiminin tarihsel çerçevesinden bahsedilerek, katı atıklarla ilgili kanunlara ve kalkınma planlarına değinilecektir. Üçüncü bölümde Balıkesir Büyükşehir Belediyesi katı atık çalışmaları incelenecektir. Balıkesir Büyükşehir Belediyesi’nin çalışma içerisinde incelenmesinin nedeni özellikle büyükşehir belediyesine geçiş noktasında katı atık hizmetleri ile ilgili yapmış olduğu başarılı projelerini inceleyebilmektir. Büyükşehir olmadan önce ve Büyükşehir Belediyesine geçmesinden itibaren katı atık yönetimi ile ilgili nelerin değiştiği, hangi alanlarda ilerleme katettiği ve nerelerde halen sorun yaşandığını tespit edebilmek açısından karşılaştırma yapılarak, literatüre katkıda bulunulacaktır
RDL Kalıcı Kaydıİncele - ArticleYalnız künye2023Chemical composition, nutritional values, elemental analysis and biological properties of Prunus mahaleb L.: From waste to new potential sources for food, cosmetic and drug industry
Bayrakçeken Güven, Zühal; Alshehri, Osama; Yüce, Neslihan; Bakan, Ebubekir; Demirci, Betül; Yilmaz, Mustafa Abdullah; Ertas, Abdulselam; Basaran, A.Ahmet
Prunus mahaleb L. seeds are widely used in the baking industry as spice for flavouring. While achieving the mahaleb powder for commercial use in local companies, the seeds are sometimes mixed unintentionally with their kernels (stony shell) during sieving procedure. As the chemical and biological properties of the kernel of seeds are not well known, the kernel, seeds and the market sample obtained from a local supplier are decided to investigate individually. The antioxidant capacity and the trace element analyses of the seeds and kernels were performed by TEAC and CUPRAC assays and ICP-MS. The market sample was analysed for nutrient and oil composition. Fatty acid composition of the oil was determined with GC-FID and GC-MS methods. The chemical composition of the methanol extract of the seeds and kernels was studied by LC-MS/MS. Trace elements Mn, Co, Ni, Cu, Zn and Se were determined in the methanol extracts, ethyl acetate and water fractions. Mushroom tyrosinase enzyme inhibitions of 33 different extracts and fractions of various waste parts of the plant (kernel, fruit, twigs, flos, leaves) were investigated. The nutritional values showed that the market sample had high nutritious properties. The fatty acid content of the oil was found to be valuable in remedying dysfunctions of the body. Kernel ethylacetate fraction showed the highest tyrosinase enzyme inhibition. The role of copper element on enzyme activity was determined. The kernels are accepted as a waste material may also be evaluated as a good promising choice for food, cosmetic and drug industry.
RDL Kalıcı Kaydıİncele - ArticleYalnız künye2023Is export quality a viable option for sustainable development paths of Asian countries?
Manga, Muge; Cengiz, Orhan; Destek, Mehmet Akif
This paper investigates the role of export quality in climate action goal of the sustainable development goals in emerging Asian countries. For this purpose, the empirical model that observes the impact of real GDP, energy use and export quality index on carbon emissions is constructed and is analyzed by ARDL bounds testing approach for the period from 1970 to 2014. We also include the square of real GDP as independent variable to observe the existence of environmental Kuznets curve (EKC) hypothesis which implies the parabolic relationship between economic growth and environmental degradation. The findings show that increase in export quality leads to a fall in CO2 emissions for China and India. In contrast, the effect of increasing export quality increases CO2 emissions in Thailand and the Philippines. Lastly, our asymmetric causality results show that the positive shocks of export quality causes positive shocks of CO2 emissions in Thailand and Indonesia. Furthermore, we found that positive export quality shocks cause negative CO2 emissions shocks in India while negative export quality shocks cause positive CO2 emissions shocks in China. We also confirm the inverted U-shaped EKC hypothesis in China and Thailand.
RDL Kalıcı Kaydıİncele - Book ChapterYalnız künye2023Which barriers need more attention in food waste management and blockchain integration?
Aka, Salih
Blockchain is a digital innovative technology that is decentralized, open to the use of all stakeholders, does not allow data manipulation, and has many more features. Blockchain, which has the potential to solve problems in food safety, is attracting more and more attention from researchers in this field. In this study, a conceptual model for the integration of blockchain and food waste management is proposed. The combination of blockchain and food waste management has economic, social, and environmental dimensions that will serve the purpose of reducing food waste. However, some blockchain barriers make it difficult to integrate with food waste management. Blockchain barriers that affect the success of this integration are examined with the BEST-Worst Method (BWM). As a result of the analysis, infrastructure setup and adaptation challenges stand out as the most important barrier. The study would be a starting point for practitioners working on food waste management and the blockchain system, and government officials planning regulations in this area.
RDL Kalıcı Kaydıİncele - ArticleAçık Erişim2023Using Grapefruit and Tomato Waste in O/W Type Chicken Meat Emulsion
Akşit, Zeynep; Gençcelep, Hüseyin
Utilizing food waste is crucial for several reasons, including preserving valuable ingredients, lowering formulation costs, taking advantage of its functional properties, and preserving the environment. Grapefruit waste (GW) and Tomato waste (TW) are used in oil-in-water (O/W) emulsion formulation to investigate their contributions to emulsion stability, textural parameters, and steady shear rheological properties of the model system. O/W emulsions were formed with four different concentrations (0.5%, 1%, 2%, and 3%) of GW and TW, and chicken breast meat and corn oil were the main components of emulsions. Both food wastes increased emulsion stability (ES) in most concentrations compared to the control. The best ES of 86.35 was observed at a concentration of 1% TW emulsion. Emulsions were subjected to texture profile analysis as both row and heat-treated. Heat-treated emulsions had higher hardness values (241.2-518.6 g) than the row emulsions (149.7-247.2 g). All emulsions were found to have pseudoplastic character and exhibit shear thinning behavior. All emulsion samples' apparent viscosity fit well with the Ostwald-de-Waele model (R2>0.9). Food waste samples used in the study improved the chicken-type O/W emulsion properties in terms of emulsion stability and textural properties.
RDL Kalıcı Kaydıİncele - ArticleAçık Erişim2023In vitro genotoxicity assessment of biosynthesized zinc oxide nanoparticles
Demir, Abdussamed Yasin; Karadayi, Mehmet; Isaoglu, Mine; Karadayi, Gokce; Gulluce, Medine
There are various studies on the toxicological potentials of conventionally synthesized zinc oxide (ZnO) nanoparticles, which are useful tools for many medical applications. However, knowledge about the biologically synthesized ones is still limited. In this study, the potential of producing ZnO nanoparticles via a green synthesis method, which enables safer, environmentally, economical and controlled production by using the Symphoricarpos albus L. plant, was investigated. For this purpose, aqueous extract was obtained from the fruits of the plant and reacted with zinc nitrate precursor. Characterization of the synthesized product was carried out by SEM and EDAX analyzes. In addition, the biosafety of the product was also investigated by using the Ames/Salmonella, E. coli WP2, Yeast DEL, seed germination, and RAPD test systems. The results obtained from SEM studies showed that spherical nanoparticles with an average diameter of 30 nm were synthesized as a result of the reaction. EDAX findings confirmed that these nanoparticles were composed of Zn and O elements. On the other hand, according to the findings of the biocompatibility tests, the synthesized nanoparticle did not show any toxic and genotoxic effects up to a concentration of 640 μg/ml in any of the test systems. Accordingly, considering the findings of our study, it was concluded that the aqueous extract of S. albus fruits can be used for the green synthesis of ZnO nanoparticles, the products obtained successfully passed the biocompatibility tests in our study, and additionally, more comprehensive biocompatibility tests should be performed before industrial scale production.
RDL Kalıcı Kaydıİncele - ArticleYalnız künye2023Mechanical, durability and microstructural characteristics of Portland pozzolan cement (PPC) produced with high volume pumice: Green, cleaner and sustainable cement development
Ulusu, Hayati; Yılmaz Aruntaş, Hüseyin; Burcu Gültekin, Arzuhan; Dayı, Mustafa; Çavuş, Murat; Kaplan, Gokhan
Nowadays, it is frequently preferred to use pozzolans instead of clinker to reduce the CO2 emissions that increase with cement production. Because in the future, the release of artificial pozzolans, such as fly ash and blast furnace slag, will decrease. Therefore, the demand for natural pozzolanic cement will increase. This study aimed to produce Portland Pozzolan Cement (PPC) by using pumice instead of clinker up to 40%. The Chemical, physical, mechanical, durability, microstructure, and carbon footprint characteristics of PPCs were investigated experimentally. As the pumice volume in the PPCs increased, the CaO/SiO2 ratio and specific gravity decreased. Due to the hygroscopic moisture of the pumice, its grindability has become difficult. While the 40 µm sieve residue of PPCs ranges from 0.8 to 1.7%, the sieve residue ratio generally increases as the pumice volume increases. The porous structure of pumice led to an increase in Blaine fineness as the replacement ratio increased. The Blaine fineness of PPCs containing 40% pumice rose by about 20% more than the reference cement. The consistency water of PCs varies between 29 and 36%. As the water consistency increased, the setting time of the pastes was prolonged. Initial setting times of PPCs are between 150 and 220 min. If the CaO/SiO2 ratio decreased with the pumice volume, the compression strength of the mortars decreased. While the 28-day compression strength of PPC containing 10% pumice was measured as 36.2 MPa, this value was measured as 21.6 MPa for PPC containing 40% pumice. As the pumice volume increased, the mortars' drying shrinkage and sulfate-induced expansion values decreased significantly. According to the sustainability analysis, the CO2 emissions of cement vary between 518 and 880 kg CO2/t. By using pumice instead of clinker, CO2 emissions of cement can be reduced. In SEM examinations, it was determined that pumice concentrated the microstructure. As a result, it has been determined that eco-friendly cement can be obtained by using 10% and 20% pumice in PPC production.
RDL Kalıcı Kaydıİncele - ArticleAçık Erişim2023Classification of waste materials with a smart garbage system for sustainable development: a novel model
Kaya, Volkan
In today’s conditions, where the human population is increasing, environmental pollution is also increasing around the world. One of the most important causes of environmental pollution is the waste materials in the garbage. Misuse of waste materials causes significant damage to both the environment and human health. With the developing technology, the recyclability of the raw material used in the production of waste materials significantly affects both the raw material needs of the countries and the energy savings. Therefore, many traditional activities are carried out in recycling facilities in order to reuse the waste materials that can be recycled in many countries. At the beginning of these activities is manual waste collection and pre-processing depending on the human workforce. This process poses a serious threat to both the environment and human health. For this reason, there is a need for a smart system that automatically detects and classifies the waste materials in the garbage. In this study, Xception, InceptionResNetV2, MobileNet, DenseNet121 and EfficientNetV2S deep learning methods based on artificial intelligence, which automatically classify the waste materials in the garbage, were used and in addition to these methods, Xception_CutLayer and InceptionResNetV2_CutLayer based on transfer learning techniques were proposed. The proposed methods and artificial intelligence-based deep learning methods were trained and tested with a dataset containing 6 different waste materials. According to the findings obtained as a result of training and testing, a classification success rate of 89.72% with the proposed Xception_CutLayer method and 85.77% with the InceptionResNetV2_CutLayer method, a better success rate was obtained than the other artificial intelligence-based methods discussed in the study.
RDL Kalıcı Kaydıİncele - ArticleAçık Erişim2023Investigation of Physical and Chemical Properties of Bitumen Modified with Waste Vegetable Oil and Waste Agricultural Ash for Use in Flexible Pavements
Çolak, Muhammed Ali; Zorlu, Elif; Çodur, Muhammed Yasin; Baş, Fatih İrfan; Yalçın, Özgen; Kuşkapan, Emre
The rapid growth of the world population and the rapid diversification of consumption habits due to technological advancements have increased waste production. An investigation of the effects of biomass products, such as waste vegetable oil and waste agricultural ash, on bitumen’s physical and chemical properties was conducted in this study. By recycling biomass products, this study aimed to improve the performance and stability of bituminous hot mixtures, optimize the number of additives, and create more economical designs. Using the Taguchi method, 0%, 2%, 4% by weight of waste vegetable oil and 0%, 3%, and 6% by weight of waste agricultural ash were added to 70/100 penetration pure bitumen with an orthogonal array of L9. For 10, 20, and 30 min, modified bitumen samples were prepared at 170 °C, 180 °C, and 190 °C with a constant mixing speed of 3000 RPM. The samples were tested for penetration, softening point, flash point, rolling thin film oven (RTFOT), FTIR, and Marshall Design stability and flow. Based on the obtained performance statistics, 95% confidence levels were assigned to the predictions. The stability and softening point values decreased as the oil content increased, while flash and penetration values increased. With increasing ash content, stability, flash, and softening point values increased, and penetration values decreased. Compared to oil and ash additives, mixing temperature and time had relatively little effect on the modification process. Overall, the optimum parameter levels were 4% for oil, 0% for ash, 170 °C for temperature, and 10 min for time.
RDL Kalıcı Kaydıİncele - ArticleAçık Erişim2023Removal of Cr6+ ions and mordant violet 40 dye from liquid media using Pterocladia capillacea red algae derived activated carbon-iron oxides
Mohamed, Soha Mahrous Ismail; Güner, Eda Keleş; Yılmaz, Murat; El Nemr, Ahmed
In recent years, water pollution has become one of the most dangerous problems facing the world. Pollution of water with heavy metals and different dyes has caused many harmful effects on human health, living organisms and our environment. In this study, iron oxide nanomagnetic composite from Pterocladia Capillacea red algae-derived activated carbon (PCAC-IO) was synthesized by co-precipitation method using different iron salts and different base solutions. The synthesized nanocomposite was investigated with various characterization techniques such as FTIR, BET, SEM-EDX, TEM, XRD, and VSM. The obtained PCAC-IO adsorbent was used for Cr6+ ions and Mordant Violet 40 (MV40) dye removal. The adsorption mechanism of Cr6+ ions and MV40 dye on PCAC-IO was examined using several adsorption and kinetic isotherm models. Langmuir and Freundlich models were investigated using experimental data. Pseudo-first-order (PFO), Pseudo-second-order (PSO) and intraparticle diffusion models (IPDM) were applied to identify the adsorption mechanism. It has shown that the PSO kinetic model fits better with the experimental data obtained from PCAC-IO. This result can be interpreted as the adsorption of the adsorbate on the nanocomposite as chemical adsorption. The optimum conditions for maximum Cr6+ ions removal (96.88%) with PCAC-IO adsorbent occur at room temperature, 5 g L−1 adsorbent concentration, 100 mg L−1 initial pollutant concentration, pH 1 and at the end of 180 min, while maximum MV40 dye removal (99.76%), other conditions being the same, unlikely it occurred at pH 2.06 and after 45 min. The most suitable model for Cr6+ ions removal under the conditions of 1 L−1 g adsorbent concentration and 400 mg L−1 adsorbate concentration was Langmuir (Qmax = 151.52 mg g−1), while for MV40 removal it was Freundlich (Qmax = 303.03 mg g−1). We propose the use of activated carbon-supported iron oxide prepared from bio-waste material, especially from Pterocladia Capillacea red algae, as a promising adsorbent with high efficiency in the removal of Cr6+ ions and MV40 dye from aqueous media.
RDL Kalıcı Kaydıİncele - ArticleAçık Erişim2022Evaluation of Irreversibility Analysis for Different Coal Types of a Thermal Power Plant
Uzun, Sinem
In this study, first law (energy conservation) and second law (exergy) analyzes of thermodynamics were performed for a thermal power plant. It is very important to perform energy and exergy analyzes in industrial plants. These analyzes can provide guidance on improving energy efficiency and recycling waste energy. In this study, energy and exergy analyzes were made for coals with different chemical contents in nine different countries. According to the results of the analysis, the highest first-law efficiency was found in Serbian coal (second type), as 53.61%. The second highest law efficiency was determined as 46.67% in Bangladesh coal (sixth type). Environmental Destruction Index (EDI) and Sustainability Index (SI) values were determined for all coal types. According to the results of the analysis, the highest EDI value was obtained as 4.00 at the temperature of 305 K for the 2nd coal type, and the highest SI value was obtained as 1.91 at the temperature of 293 K for the 6th coal type, according to the changing reference temperature values. According to this study, the highest second law efficiency was obtained from Bangladesh coal with a carbon (C) content of 77.84%.
RDL Kalıcı Kaydıİncele - ArticleAçık Erişim2022Giysi uygulamalarında tasarım işbirliklerinin önemi
Elıbol, Betül; Sari, Safiye
Çalışmanın amacı, farklı tasarımcıların ortak yürüttükleri giysi uygulamalarında ortak hareket etme,\rortak paylaşım ve ortak gelişim sağlayan tasarım işbirliklerinin öneminin araştırılmasıdır. Bu amaçla, çalışma\riki aşamada yürütülmüştür. Çalışmanın ilk bölümünde konunun kavramsal ve kuramsal yönden açıklanmasını\rsağlayan literatür taraması, kaynak kişi görüşmesi ile kişisel fotoğraf arşivlerinden yararlanılmıştır. İkinci\rbölümde, çalışmayı yürüten tasarımcıların, tasarımsal süreçlerde kendi bağımsız fikirlerini kullandıkları ancak\rtasarıma karar verme sürecinde ortak hareket ettikleri bir ‘kapsül koleksiyon’ hazırlanmıştır. Koleksiyonda yer\ralan üç adet özgün giysi tasarımı, sanatın modaya kaynaklık ettiği bir üslupla ele alınmış ve çalışmanın teması\r“sürdürülebilirlik” konusu üzerine yapılandırılmıştır. Koleksiyonda materyal olarak geleneksel ‘Şile bezi’\rkullanılmış, böylece dokumanın sürdürülebilirlik yönü de aynı zamanda incelenmiştir. Araştırmaya katılan\rtasarımcıların ortak kanaatlerinin esas alındığı uygulama sonuçlarından; tasarım işbirliklerinin tasarım da\rkullanılan unsurları zenginleştirdiğini ve yeni ve özgün fikirlerin ortaya çıktığını, edinilen mesleki bilgilerin\rpaylaşılması yoluyla var olan yeteneklerin etkin olarak kullanıldığını ve muhtemel tasarım risklerinin en aza\rindirildiği gözlemlenmiştir. Koleksiyonun tasarımsal süreçleri ile araştırmayı yürüten tasarımcıların ortak\rkanaatinden çıkan sonuca göre, çalışmanın bölgesel - yerel markalarla farklı tasarımcıların katılacağı yeni\rişbirlikleri ile kapsamının genişletilerek yeni koleksiyonların geliştirebileceği konusuna dikkat çekilmiştir.
RDL Kalıcı Kaydıİncele - ArticleYalnız künye2022Post-fire Seismic Behavior of RC Columns Built with Sustainable Concrete
Demir, Ugur; Unal, Goktug; Goksu, Caglar; Saribas, Ilyas; Ilki, Alper
In this study, four full-scale reinforced concrete columns were built replacing 50% of natural coarse aggregates in concrete mix by recycled aggregates. Three of the columns were exposed to standard ISO-834 fire for 30, 60 or 90 minutes, while the reference specimen was not exposed. Sixty days after fire exposure, the columns were tested under constant axial load and reversed cyclic lateral displacements simulating earthquakes. Test results are evaluated in terms of lateral load capacity, ductility, stiffness and energy dissipation. In addition, an analytical study was conducted to predict the lateral load-displacement response of fire-damaged columns built with recycled aggregates.
RDL Kalıcı Kaydıİncele - ArticleAçık Erişim2022Direct Blue 71 Degradation in the Presence of ZVI and H2 O2 Advanced Fenton Process: Determination of Optimum Conditions and Kinetics
Ertugay, Neşe; Acar, Filiz Nuran
This study investigated color and COD removal of azo dye Direct Blue 71 (DB71) by a Fenton-like process in zero-valent iron (Fe0 = ZVI). The UV–vis spectra of DB71 exhibit three main absorption bands – two in the UV region and one in the visible region. UV–vis spectra showed that the azo linkages in the molecule structure of the dyes were destroyed during the decolorization. The influence of various operational parameters such as pH, ZVI dosages, hydrogen peroxide (H2 O2) concentrations and temperature are studied to determine the optimum conditions for color and COD removal. pH is highly effective parameter of decolorization and COD destruction in this work. However, H2 O2 concentration and ZVI dosages were not only effective in the removal of COD for 100 mgL-1 initial DB71 concentration. Therefore, the optimum ZVI:H2 O2 ratio is based on determining the value of COD removal. Optimum conditions were accepted to be pH of 2.5, ZVI:H2 O2 ratio 4:1 and 20ºC temperature. The result indicated that 100% of decolorization efficiency was achieved within 20 min in the range of 150-400 mg/L initial DB71 concentrations by using optimal conditions. Residual COD values were 15.38, 22.35, 22.58, 27.04, 31.86 mg/L for 150, 200, 250, 300, 400 mg/L initial DB71 concentrations at the end of reaction time, respectively. Additionally, increasing the reaction temperature from 20 to 40ºC negatively affected the decolorization and degradation rate DB71. The experimental kinetic data are fitted very well the Behnajady–Modirshahla–Ghanbery model for color removal of DB71 dye.
RDL Kalıcı Kaydıİncele - ArticleYalnız künye2022Radiological characteristics of Self-Compacting Concretes incorporating fly ash, silica fume, and slag
Bulut, H. Alperen; Şahin, Remzi
This article presents the results of a comprehensive study investigating the hypothesis that higher concentrations of natural radionuclides, that are harmful to human health, may be present in Self-Compacting Concretes (SCCs) due to its higher powder material content compared to conventional concretes. The fresh (slump-flow, T500 time, V-funnel) concrete and compressive strength of SCCs prepared by replacing Portland cement with fly ash (FA), silica fume (SF), and ground granulated blast furnace slag (GGBFS) in the respective range of 5%, 12.5%, and 20% were determined. The radionuclide activity concentration of all solid concrete components and SCCs were determined using the gamma spectrometry method. Radioactivity analyses including the calculation of the activity concentration index and annual effective dose equivalents were also performed. The findings showed that the specimens with the highest average compressive strength at the end of 120th day were, respectively, SF (54.2 MPa), FA (52.2 MPa) and GGBFS (46.1 MPa) added to the SCC. The obtained concentration of the Radium-226 value (41.1) of 20% UK with added SCC was 1.8 times higher than the control concrete (22.7) and 2 times higher than 20% SF added SCC (19.7). The highest Radium equivalent activity (Raeq) values were FA20 (89.52), GGBFS20 (72.05), control concrete (70.86) and SF20 (68.01). It was determined that the FA selected for the study exceeded the limit specified for structural material (3.38 > 1) and fell in the radiologically hazardous class. It has been proven that SF can be used as a radioactivity reducing material of concretes. The results revealed that the research hypothesis was confirmed in terms of FA.
RDL Kalıcı Kaydıİncele - ArticleAçık Erişim2021Erzincan ili hayvansal atık kaynaklı biyogaz potansiyelinin değerlendirilmesine yönelik biyogaz tesisi senaryoları
Badem, Anıl; Kurnuç Seyhan, Aslıhan
Hayvan atıklarından biyogaz üretimi gibi atıkların enerji teknolojisine uygulanması, Türkiye de dâhil olmak üzeregelişmekte olan birçok ülkede sürdürülebilir enerji geliştirme hedeflerine ulaşmak için en iyi araçlardan biri olarak kabuledilmektedir. Türkiye, çok sayıda hayvan çiftliği ile önemli bir potansiyele sahip olsa da bugüne kadar biyogaz üretimiiçin potansiyel gerçekleşmemiştir. Bu makale, Türkiye'de alternatif bir enerji üretimi kaynağı olarak hayvan atıklarındanbiyogaz üretimi yoluyla atıkların enerji teknolojisine potansiyel uygulanmasının vurgulanmasını amaçlamaktadır. Hayvanatıkları gibi yenilenebilir hammaddelerin anaerobik sindirimi, biyogaz şeklinde temiz enerji üretimi için ileriye dönük birteknoloji olarak bilinmektedir. Bu çalışmada Erzincan ilinin hayvansal atık kaynaklı enerji potansiyeli hesaplanmıştır.Bulgular, Erzincan'daki hayvan atıklarından yaklaşık 15.5 milyon m3/yıl biyogaz potansiyelinin üretilebileceğinigöstermektedir. Bu doğrultuda, Erzincan ve ilçelerinin mesafeleri, atık kapasiteleri ve ekonomik verimliliği göz önünealındığında, 0.5 MW, 1.2 MW ve 2.4 MW kurulu güce sahip 3 farklı biyogaz santrali senaryosu hazırlanmıştır. Butesislerin yatırım maliyetleri ve her bir tesis için gerekli olan yatırımın geri ödeme süreleri hesaplanmıştır. Araştırmayadayanarak, Erzincan'da biyogaz üretimi ile hayvan atıklarının enerjiye dönüştürülmesi açısından birçok fırsataraştırılabilir. Bölgede, küçük boyutlarda olmak üzere, önerilen sayıdan daha fazla sayıda biyogaz tesisi kurmak damümkündür.
RDL Kalıcı Kaydıİncele - Review ArticleAçık Erişim2021Sosyal imalat: sosyal ağ temelli kaynak paylaşımı
Aka, Salih
Üretim sistemleri teknolojik yeniliklerin ve ulaşım alternatiflerinin iyileştirilmesinin paralelinde sürekli gelişim göstermektedir. Özellikle ticaretin sınırları aşması ve üretim organizasyonlarının küreselleşmesi ile beraber imalata dayalı sektörler daha da rekabetçi hale gelmektedir. Nitekim kaynaklarını verimli şekilde kullanamayan ve talebe hızlı cevap veremeyen şirketler ve hatta ülkelerin başarılı olması daha da zorlaşmaktadır. Sosyal imalat çeşitli alanlarda üretim kabiliyetine sahip ve üretim kaynaklarını paylaşmak isteyen görece küçük imalatçılar ile ürününün üretilmesi görevlerini dış kaynak hizmeti kullanarak gerçekleştirmek isteyen büyük çaplı ana üretici işletmelerin internet tabanlı bir bulut sistemi içerisinde bir araya getirilmesini sağlayan etkin ve yenilikçi bir platform olarak öne çıkmaktadır. Sosyal imalat, özellikle Endüstri 4.0 devrimi ile gelen üretimdeki paradigma değişimlerinin sonuçlarından birisi olarak ortaya çıkmaktadır. Geleneksel tedarikçi-üretici arasındaki daha fazla sipariş odaklı, tesisler arası mesafeler ve karşılıklı güven ilişkilerinden etkilenen üretim koşulları, sosyal imalat ile her aşamada şeffaflık sunan, fiziki ortamlardan bağımsız, tüm paydaşların ortak karını en iyileyen, tam olarak imalatçının istediği hizmeti bulmaya odaklı ve zaman tasarrufu sağlayan bir platforma taşınmaktadır. Bu çalışmada sosyal imalat kavramı anlatılmış, sosyal imalatı oluşturan alt fonksiyonlar sunulmuş ve sosyal imalatın çalışma mekanizması ile kullanım alanları tanıtılmıştır. Çalışmanın amacı üretim verimliliğini artıracak yenilikçi ve dijital teknolojilerden birisi olan sosyal imalatın ülkemizdeki kullanım alanlarına uyarlanmasına yardımcı olmaktır. Bu açıdan, çalışmanın, tedarik zinciri organizasyonlarının oluşturulmasında ve üretim kaynaklarının etkin kullanım yollarının araştırılmasında faydalı olması beklenmektedir
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