Yazarlar
- Duran, Celal(26)
- Ozdes, Duygu(21)
- Baltaci, Cemalettin(10)
- Gundogdu, Ali(10)
- Gül, Abdulkadir(9)
- Çullu, Mustafa(8)
- Aksüt, Yavuz Selim(7)
- Baltacı, Cemalettin(7)
- Barut, Abdulkadir(7)
- Bozbeyoglu, Pinar(7)
- Erol, Ismail(7)
- Ozeken, Sengul Tugba(7)
- Peker, Iskender(7)
- Eker, Hasan(6)
- Külekçi, Gökhan(6)
- Altuner, Elif Esra(5)
- Ar, Ilker Murat(5)
- Güzel, Melih(5)
- Karahan, Selim(5)
- Karpuz, Ömer(5)
- Kıranşan, Murat(5)
- Odabaş, Halil İbrahim(5)
- Seferoğlu, Mehmet Tevfik(5)
- Uysal, Turan(5)
- Demir Şahin, Demet(4)
- Imamoglu, Mustafa(4)
- Karpuz, Omer(4)
- Top, Yener(4)
- Akar, Bülent(3)
- Akpinar, Muhammet Vefa(3)
- Akpınar, Özlem(3)
- Avci, Ibrahim(3)
- Aydoğmuş, Ercan(3)
- Bozbeyoğlu, Pınar(3)
- Cakir, Mehmet Ali(3)
- Camoglu, Aslihan Yilmaz(3)
- Cavusoglu, Ibrahim(3)
- Daulay, Amru(3)
- Ercikdi, Bayram(3)
- Komut, Osman(3)
Yayınlar
- MakaleAçık Erişim2025Microstructural investigation of geopolymer composites obtained from recyclable waste materials
Çavdar, Özlem; Temizer, Hülya
Today, researchers are exploring materials that could replace cement and provide solutions for utilizing waste products. In this study, a binder was formulated using 85% blast furnace slag and 15% fly ash. Three different additives—marble powder, strontium mineral waste, and titanium dioxide—were incorporated as partial replacements for blast furnace slag at ratios of 5%, 5%, and 1%, respectively, to create geopolymer mortars. The impact of these additives on the flexural and compressive strength of the mortars was evaluated. Furthermore, SEM/EDX analysis was performed to assess the microstructural effects of the additives. The findings revealed that titanium dioxide resulted in the highest compressive strength, recorded at 65.7 MPa. The SEM/EDX analysis suggested that the samples demonstrated a homogeneous internal structure, indicating a robust bond among the components of the matrix.
- MakaleAçık Erişim2025Removal of anionic and cationic dyes from aqueous solutions using drinking water treatment plant sludge (DWTS): Equilibrium and kinetic evaluation
Duran, Celal; Ozdes, Duygu; Turfan, Fatma Asya; Kılıç, Neslihan; Yaltirik, Fatma
The present research investigates the removal of Brilliant Green (BG) and Remazol Brilliant Blue R (RBBR) dyes by an adsorption system utilizing drinking water treatment sludge (DWTS) as an adsorbent. It aims to contribute to sustainable treatment methods by evaluating waste sludge as a low-cost and environmentally friendly adsorbent. In the study, the significant parameters affecting the adsorption process were systematically investigated. During the experiments, the effects of factors such as initial pH of the solution, equilibrium time, adsorbent amount and initial dye concentration on the adsorption efficiency were evaluated. The obtained data were tested with Langmuir and Freundlich isotherm models and it was determined that adsorption occurred on both homogeneous and heterogeneous surfaces. The maximum adsorption capacity of DWTS was calculated as 100.0 mg g-1 and 38.9 mg g-1 for BG and RBBR, respectively. Kinetic analyses were performed to understand the dynamics of the adsorption process. Pseudo-first order and Pseudo-second order kinetic models were evaluated and it was noticed that the pseudo-second order model explained the adsorption data better. As a result, DWTS has been proven to be an effective adsorbent in the removal of BG and RBBR. The findings indicated that DWTS has significant potential for evaluation in advanced treatment processes in terms of environmental sustainability.
- MakaleAçık Erişim2025Atık bertaraf tesis yer seçiminde etkili olan kriterlerin fucom yöntemiyle değerlendirilmesi
Gergin, Ramazan Eyüp
Artan nüfusun etkisiyle birlikte oluşan atık miktarlarındaki değişim nedeniyle toplumlar çevresel, sosyal ve ekonomik anlamda çeşitli etkilerle karşı karşıya kalmaktadır. Bu nedenle atık bertaraf tesis yerleri hem bireyler hem de ülkeler açısından daha önemli bir konumda yer almaktadır. Buna paralel olarak atıklarla mücadele konusunda karşılaşılacak zorluklarla mücadele edilebilmesi için atık bertaraf tesis yer seçimi çalışmalarının arttırılması önem arz etmektedir. Bu çalışmada temel amaç atık bertaraf tesis yer seçim probleminde etkili olan kriterlerin belirlenerek önem derecelerinin hesaplanmasıdır. Bu amaç doğrultusunda atık bertaraf tesis yer seçimini etkileyen kriterler detaylı bir literatür araştırması sonucunda belirlenmiştir. İlgili kriterlerin önem derecelerinin hesaplanmasında Full Consistency Method (FUCOM) yönteminden faydalanılmıştır. Gerçekleştirilen uygulama doğrultusunda elde edilen sonuçlara göre, atık bertaraf tesis yer seçiminde etkili olan kriterler içerisinde önem ağırlığı açısından en etkili kriterin 0,33527 önem ağırlığı ile Arazi Özellikleri (K1) olduğu belirlenmiştir.
- MakaleAçık Erişim2025The impact of agricultural value added, urbanisation and renewable energy consumption on environmental quality in MINT countries
Akyol, Mehmet; Bakkaloğlu, Ayşen
In this paper, the effects of agricultural value added, urbanisation and energy consumption on environmental quality in MINT (Mexico, Indonesia, Nigeria, Turkey) countries were analysed for the period between 1992-2019. In the first stage of the study the panel analysis was used then the existence of horizontal cross-section dependence between the variables was tested and then the CIPS test, was used to test the stationarity of the series. In the paper where the existence of homogeneity was tested with the Delta test, the long-run relationship between the series was tested with the Pedroni panel cointegration test. Finally, the effects of agricultural value added, urbanisation and energy consumption on the environment were analysed by fully modified least squares estimator (FMOLS) analysis. According to the FMOLS results, the increase in agricultural value added and urbanisation rate has a negative impact on environmental quality, while renewable energy consumption has a positive impact on environmental quality. The results of the study show that more environmentally friendly policies should be developed and implemented in the agricultural production process in the country group in question, renewable energy investments and consumption should be increased, and the urbanisation rate should be taken under control and environmentally friendly new generation city plans should be put into effect urgently.
- MakaleAçık Erişim2025A New Perspective on Technology, Productivity, and Environmental Sustainability in the European Union
Cakir, Mehmet Ali; Ökte, Mehmet
This study examines the relationship between economic growth, energy consumption, technology, and productivity intensive technology in the context of environmental degradation across selected European Union countries from 1996 to 2021. Utilizing the cross sectionally augmented autoregressive distributed lag model (CS-ARDL) and the load capacity factor as an environmental proxy, the findings confirm environmental kuznets curve (EKC) hypothesis indicating that economic growth continues to exert pressure on the environment. While energy consumption significantly contributes to environmental degradation, contrary to popular belief, technological advancements alone do not mitigate this issue. Instead, the study highlights that productivity intensive technologies are more effective in reducing environmental degradation. Policy recommendations emphasize the need for green growth strategies, energy efficiency improvements, sectoral energy quotas, and international cooperation in technology sharing. Special attention should be given to ensuring that technological development increases productivity and reduces environmental degradation. The findings contribute to the literature by highlighting the significance of aligning productivity and technological advancement for sustainable environmental outcomes.
- MakaleAçık Erişim2025Sürdürülebilirlik ve ESG Kapsamında Tedarik Zincirlerinde Özen Yükümlülüğü
Beken, Hıkmet Gülçın
Karmaşık ve dinamik tedarik zincirleri içerisinde insan hakları ve çevreye ilişkin ihlaller sıklıkla görülmektedir. Küresel düzeyde yaşanan çevresel, ekonomik, sosyal ve iklim değişikliği kaynaklı riskler ve sorunlar karşısında şirketler faaliyetlerini çevresel-sosyal-yönetimsel (ESG) bağlamda gerçekleştirmelidir. Tedarik zincirlerinin sürdürülebilirliği ve etik tedarik zincirlerinin oluşumunda kurumsal hesap verebilirliğin tedarik zincirlerine yansıması iş dünyasına yönelik uluslararası standartlar, rehber ilkeler ya da günümüzde sıklıkla benimsenmeye başlayan özen yükümlülükleri üzerinden gerçekleştirilmektedir. Özen yükümlülükleri bu bağlamda, kurumsal anlamda gönüllü hesap verebilirlikten zorunlu hesap verebilirliğe geçişi de nitelemektedir. Hem Avrupa hem de Avrupa dışı bölgelerde zorunlu insan hakları özen yükümlülüklerinin artarak benimsendiği görülmektedir. Hesap verebilirliğin küresel tedarik zincirlerindeki yansıması olan bu zorunlu özen yükümlülükleri insan haklarının korunması kadar çevresel konuları da kapsar hale gelmiştir. Çalışmada karşılaştırmalı olarak incelenen Alman Tedarik Zinciri Özen Yükümlülüğü Kanunu (LkSG) ve AB Kurumsal Sürdürülebilirlik Durum Tespiti Direktifinin gerçekleştirilmesinin temel motivasyonlarına ve bu düzenlemelerin beklenen ekonomik ve ticari etkilerine yer verilmektedir.
- MakaleAçık Erişim2025A General Assessment of the Retail Price Premiums of Organic Food Products in Türkiye
Adanacioglu, Hakan; Doğan, Nilgün
Organic agricultural production has emerged as an alternative to conventional production and aims to promote a sustainable production approach based on the health of soil, the protection of nature and human well-being factors with an environmentally friendly production method. Organic production combines traditional knowledge with scientific innovation to benefit the natural environment and promote a higher quality of life for all. Organic agricultural products, which have gained significant market share globally and expanded into various markets, are mainly produced for export in Türkiye. The growth of the organic market depends on the balance between supply and demand. In this respect, the aim of this study is to examine the product market prices, which is a key factor affecting the purchasing behaviour of consumers in order to grow the organic market and reach the desired level. Price premiums were examined for the following food groups: cereals/legumes, fruit, vegetables, milk, dairy products and eggs, dried fruit and nuts. This study relies on secondary data and retail prices were collected through online websites. According to the results, the price premium, which was calculated by comparing the prices of organic and conventional versions of selected food products, was found to be in favour of organic products. This price premium was found to be particularly high for noodles, dry beans, buckwheat and rice from the cereals/legumes group; grapefruit, apple and pear from the fruit group and yellow chickpeas, pumpkin seeds from the nuts group. These results provide useful insights for food producers, marketers and policy makers when making decisions about organic food.
- MakaleAçık Erişim2025Sürdürülebilirliğin sosyal medyadaki temsili: greenfluencer paylaşımları üzerinden bir değerlendirme
Okur, Hatice Duran
Bu çalışma ekonomik sistemin öne sürdüğü sürdürülebilirlik söylemlerindeki ve pratiklerindeki çelişkileri, Greenfluencer’ların Instagram’daki sürdürülebilir yaşamla ilgili paylaşımları üzerinden analiz etmeyi amaçlamaktadır. Nitel araştırma yöntemiyle yapılan bu çalışmada, amaçlı örnekleme yöntemlerinden ölçüt örnekleme yöntemi kullanılarak 01.01.25-15.05.25 tarihleri arasında 10 yeşil etkileyicinin yaptığı paylaşımlardan veriler elde edilmiştir. Veriler nitel içerik analiziyle, “sürdürülebilirliğin çerçevesi”, “sürdürülebilirliğin inşası” ve “sürdürülebilirlik çelişkileri” olarak üç tema altında çözümlenmiştir. Greenfluencer’ların paylaşımlarında sürdürülebilirliği bireysel tüketimle ve bireysel sorumluluklarla ilgili pratiklerle çerçeveledikleri ve sürdürülebilir yaşam sunumunu bilgilendirici içeriklerle, tüketim alternatifleriyle, reklam ve işbirliğiyle, pratik çözüm önerileriyle, başarı tasvirleriyle inşa ettikleri görülmüştür. Ayrıca greenfluencer’ların sürdürülebilir yaşam sunumunu, bazı belirsizlik ve şeffaflık boşluklarıyla, sistem eleştirisinin sınırlılığıyla, orta-üst sınıf perspektifini yansıtan tüketim kültürü temsili ile çelişkili olarak devam ettirme çabaları olduğu bulgulanmıştır. Greenfluencer’ların ürettikleri içerikler önemli olmakla birlikte, ekolojik sorunların oluşmasında ve çözümünde bireysel sorumlulukların ve bireysel tüketimin ön plana çıkarılması, sistemsel sorunların göz ardı edilmesine neden olabilmektedir. Ayrıca tüketim kültürünün temsiline yönelik paylaşımlarla tüketim ideolojisinin yeniden üretilebileceği, sınıfsal ve kültürel ayrımların derinleşebileceği sonucuna ulaşılmıştır.
- MakaleAçık Erişim2025Plentmiks Temel Tabakası Yapımında Krom Pasa Malzemesi Kullanımı ve Ekonomik Analizi
Seferoglu, Mehmet Tevfik; Acı, Elif Nur
Bu araştırmanın amacı, Karayolu Teknik Şartnamesi (KTŞ) standartlarına uygun tasarlanacak olan bir plentmiks temel (PMT) tabakası için Kop Dağı (Bayburt) krom maden sahasında cevher üretim faaliyetleri sonucu ortaya çıkan ve ekonomik değeri bulunmayan atıl durumdaki krom (Cr) pasa malzemesinin belirli oranlarda kullanımının sağlayacağı mali faydaların belirlenmesidir. Pasa karışım oranlarının maliyet analizleri yapılarak bir karayolunun PMT tabakası yapım maliyetleri de dahil olmak üzere krom pasasının temin noktasına olan mesafeye bağlı ekonomiklik değerlendirmesi yapılmıştır. Çalışma neticesinde %100 Cr içerikli karışımının PMT tip-1 tabakalarında kullanımının mümkün olduğu ve %100 doğal agrega (Da) ile tasarlanan tabakaya kıyasla en uzak mesafe için bile %18’in üzerinde mali kazanç sağladığı belirlenmiştir. Cr pasa malzemelerinin, PMT tip-1 tabakaları için Da yerine alternatif olabileceği ve çevresel faydaların yanısıra tatmin edici ölçüde ekonomik fayda da sağlayacağı sonucuna varılmıştır.
- MakaleAçık Erişim2025Sumak ekşisi üretiminde ohmik ısıtma destekli evaporasyonun kullanımı: Kalite parametreleri ve proses koşulları üzerindeki etkileri
Baltaci, Cemalettin; Odabaş, Halil İbrahim; Tunç, Merve Tuğçe
Bu çalışma ile ohmik ısıtma destekli evaporasyonun sumak şurubu üretimi üzerindeki etkilerinin incelenmesi amaçlanmıştır. Bu amaçla hem geleneksel evaporasyon hem de ohmik ısıtma destekli evaporasyon yöntemleri kullanılmıştır. Ohmik ısıtma destekli evaporasyon işleminde 20 V/cm (188 V) ve 25 V/cm (235 V) olmak üzere iki farklı voltaj gradyanı uygulanmıştır. Çalışmada, örneklerin fizikokimyasal parametreleri, HMF (5-hidroksimetilfurfural) miktarları, antioksidan özellikleri, reolojik karakteristikleri ve uygulanan metotların enerji tüketimi ile diğer proses parametreleri incelenmiştir. Ohmik ısıtma destekli ve geleneksel evaporasyon yöntemleriyle üretilen sumak şurupları arasında antioksidan özellikleri veya HMF miktarları açısından önemli bir farklılık bulunmamıştır. Ancak enerji verimliliği açısından incelendiğinde, ohmik ısıtma destekli evaporasyon işlemi sırasında enerji tüketiminin (20 ve 25 V/cm için sırasıyla 121,93±5,98 ve 95,00±3,08 kj), geleneksel yönteme göre (1331,00±101,82 kj) yaklaşık on bir kat daha düşük olduğu hesaplanmıştır. Elde edilen sonuçlar incelendiğinde, ohmik ısıtma destekli evaporasyon ile üretilen sumak ekşilerinin kalite özelliklerini korunurken, enerji tüketimini, CO₂ emisyonlarını ve proses parametrelerinin önemli ölçüde azaldığını göstermiştir.
- MakaleAçık Erişim2025Particle board production using paper mill waste sludge and European black pine (Pinus nigra A.) wood chips
Karahan, Selim; Tekel, Muharrem
Paper mills use excessive amounts of water throughout production to produce paper. While mills treat water for reuse, sludge is generated and must be processed as a waste, along with some washing water. In this study, waste sludge from a kraft process mill mixed with up to 40% black pine (Pinus nigra) wood chips was investigated for multi-purpose board production using urea formaldehyde resin and ammonium chloride as a hardener. The panels were pressed at 150 degrees C for 7 minutes between 2.4 MPa and 2.6 MPa. The resulting panels were 18 mm thick, with a density of from 0.69 gr/cm3 to 0.71 g/cm3. Measurements of density, moisture, water absorption, thickness swelling, modulus of rupture, modulus of elasticity and internal bond strength to the surface were carried out on the particle board panels. The results indicated that panels could be used for general purposes.
- MakaleAçık Erişim2025Optimal Ratio of Steel and Polyester Fibers on the Mechanical Behavior of Alkali-Activated Concrete Produced by Industrial Waste Minerals
Aksüt, Yavuz Selim; Çullu, Mustafa; Yetgin, Şükrü
Alkali Activation Concretes (AAC) have many superior properties compared to Ordinary Portland Cement Concrete (OPC). However, it shows traditional concrete behavior with its brittleness. In this case, the tensile strength and flexural strength which are weak in addition to ductility is being studied to be increased by using various artificial and natural fibers. In this context, it is inevitable to conduct multifaceted research to improve the behavior of Fiber Alkali Activated Concrete (FAAC). In this study, 13 different mixes were made using steel and polyester fibers in different proportions by volume (0%; 0.25%; 0.50%; 0.75%; 1%) separately and hybrid. The mechanical properties of cubic (150 × 150 × 150 mm), cylindirical (100 × 200 mm) and prismatic (150 × 150 × 600 mm) specimens were determined including compressive strength, modulus of elasticity and poison ratio, splitting tensile strength and flexural strength (toughness-energy absorption capacity and modulus of rupture). crack formation in concrete occurs early and a significant decrease in strength is observed due to the high flexibility and low flow resistance of polyester fibers. Steel fibers with high strength and higher yield strength were used in hybrid form to solve this problem. It was revealed that the blend ratio that contributed the most to the mechanical behavior of the specimens was the case where the fibers were used as hybrid at a ratio of 1% by volume evaluation from both the experimental results and the optimization.
- MakaleAçık Erişim2025A strategy for the one-pot direct production of 5-hydroxymethylfurfural (HMF) from sucrose using organic weak acid in situ as a catalyst
Gül, Abdulkadir; Tanyıldızı, Muhammet Şaban
5-Hydroxymethylfurfural (HMF), which can be produced in high yields by acid-catalyzed dehydration of carbohydrates, is used as a feedstock in biofuel and biopolymer production. However, these acidic catalysts are usually added externally, which increases HMF production costs. Furthermore, other important parameters for high yields of HMF production are raw material selection, reaction medium, and separation-purification processes. The aim of this study is to produce HMF in one-pot without the addition of any exogenous catalyst by evaluating the fructose remaining in the production medium in which the glucose from sucrose hydrolysis is microbially fermented into gluconic acid (GA). HMF production from fructose in a biphasic system consisting of a fermentation liquid containing GA and fructose and 2-Methyltetrahydrofuran (2-MeTHF) was optimized using Central Composite Design (CCD). The variables examined included reaction time, reaction temperature, solvent type, salt type, and organic/aqueous phase ratio. In the study, by chelating GA and calcium ions, the low degree of ionization of GA was increased, and HMF was produced in high yields without the addition of a catalyst. Under optimum conditions, using 2-MeTHF/ fermentation liquid (6:1) and 7.56 wt% CaCl2, the yield of HMF produced in pressurized (hydrothermal) vessels at about 147 °C for 158 min reached 77.6 % of the theoretical yield. The amount of GA in the production medium was 92.64 % preserved from degradation. GA and HMF in different phases of the biphasic system were purified from the production medium in high yields. Furthermore, 2-MeTHF, which constitutes the organic phase of the biphasic system, was recovered at approximately 95 % by vacuum evaporation. As a result, HMF production from sucrose, which is a more economical and abundant raw material compared to glucose and fructose, was realized in one-pot without the addition of any catalyst.
- MakaleAçık Erişim2025Some physical and mechanical properties of particle boards produced from industrial wood chips and Scots pine (Pinus sylvestris) cones
Karahan, Selim; Guler, Cengiz
This study investigated the potential use of Scots pine cones as an alternative raw material to larch wood chips for particle board production. Due to the increasing scarcity of forest resources, exploring alternative raw material for the forest industry has gained importance in in recent years. Particle boards were produced in laboratory conditions by blending industrial wood chips with Scots pine cones in varying proportions (25 %, 50 %, 75 % and 100 %) and usingr urea formaldehyde glue. The adhesice mixture contained 55 % urea formaldehyde glue and 33 % ammonium chloride as a hardener. Te production parameters included a press temperature of 150 °C, a press time was 7 minutes, and a press pressure of 2,4 MPa to 2,6 MPa. The resulting boards had a thickness of 16 mm and a density ranging from 730 kg/m3 to 740 kg/m3. Tests for thickness iswelling, water absorption, bending strength, modulus of elasticity and tensile strength perpendicular to the surface were conducted. Results showed that the physical and mechanical properties of the boards containing up to 25 % Scots pine cone met the required standards.
- MakaleAçık Erişim2025Comprehensive study on the role of mycrisparite in enhancing strength, stability, and microstructural traits of self-compacting mortars
Etli, Serkan; Yılmaz, Tekin
The present research work aims at promoting the mechanical, durability and microstructure performances of self-compacting mortars (SCMs) and lessening the cement production-induced costs and environmental difficulties, by replacing binder with definite proportions (2.5–15%) of MS. To achieve these goals, the compressive and flexural strength (UCS, FS), freeze–thaw (F–T), sorptivity (Sp), MIP (tP, psD) and SEM tests were conducted on SCMs cured for diverse (7–90 days) ages. The outcomes unearthed that replacing binder with MS at small proportions boosted the UCS/FS performances of SCMs. These improvements in strength performance compared to MS-0 were more spectacular in MS-2.5, which produced higher UCS and FS of 8.6–21.0% and 10.0–25.7%, respectively at all curing ages. Similarly, the same SCMs, which betrayed lower UCS- (10.3 < 16.7) and FS-losses (31.6 < 41.0) than the control at the end of the 200-cycle F–T test, were able to remain more endurance against F–T deterioration. Besides, MS replacement up to 10% enabled the SCMs to exhibit lower tP- (up to 11.2%) and Sp values (up to 61.2%) by ameliorating the psD (refining the larger pores into finer pores). The current research can be consequently commented to provide more beneficial SCM design on both strength/stability and microstructure, and cost and environmental troubles for the building industry.
- Kitap BölümüAçık Erişim2025Ensuring Circularity through Outsourcing Decisions in Solar Photovoltaic Supply Chains
Erol, Ismail; Peker, Iskender; Benli, Tolga; Ar, Ilker Murat
Because solar photovoltaic (SPv) panels have seen such significant cost reductions in recent years, it has proven to be by far the most dynamic forms of renewable power generation. However, the transition from linear to circular is also crucial for building sustainability in SPv supply chains. The circular economy (CE) is appealing in part because of its ability to bring economic and environmental development objectives together to ensure sustainable production and consumption. To aid in the shift to a more circular economy, several circular-based strategies for various functions such as procurement can be developed. In this study, critical success factors (CSFs) to ensure circular outsourcing structure in SPv supply chains are identified and scrutinized. To achieve this, a multi-criteria-based methodology is proposed. The findings of this study argue that understanding the actual implications of not converting to circular outsourcing (C12) is the most significant cause CSF. This study also provides several implications.
- Kitap BölümüYalnız künye2025Applying RATMI (Ranking by Alternatives Trace to Median Index) for Ranking Countries Based on Sustainability Performance
Simsek, Ahmet Bahadir; Simsek, Aybala
Today, global problems such as climate change, resource depletion and social inequality motivate the need for tools that can be used to measure the sustainability performance of countries. In this section, a new MCDM approach, RATMI (Ranking by Alternatives Trace to Median Index), is proposed with this motivation. RATMI uses trace and median similarity techniques to provide a balanced and accurate ranking as the median minimises the effect of outliers. In this chapter, the RATMI method is used to assess the sustainability performance of 157 countries for the period 2016-2020 on the basis of economic, social and environmental dimensions. The contributions of this study include the potential to promote RATMI as an effective tool for sustainability assessment of countries, identify role models, and inform policymakers on the development of sustainability strategies at the global level. This practice not only advances the literature on MCDM in sustainability assessments, but also provides a practical framework to guide future policy and research aimed at promoting sustainable development.
- MakaleYalnız künye2025Durability properties of fiber-reinforced geopolymer concrete with natural and industrial waste mineral admixtures
Aksüt, Yavuz Selim; Çullu, Mustafa; Yetgin, Şükrü
In this study, ground granulated blast furnace slag (GGBFS) and quarry rock dust (RD), both industrial and natural mineral wastes were used as binder materials in geopolymer concrete. The influence of these mineral admixtures on the concrete’s durability under aggressive environmental conditions was investigated. Steel, polyester, and hybrid fibers were incorporated at volume fractions of 0%, 0.25%, 0.50%, 0.75%, and 1.0% to further enhance durability performance. Freeze-thaw and sulfate resistance tests were carried out to evaluate the effects of fiber type and content on the durability behavior of the geopolymer concrete. The test results showed that the mineral waste-based binder system itself offered considerable durability while the addition of fibers significantly improved resistance to freeze-thaw cycles and sulfate attacks. Among all types, the geopolymer concrete with 0.5% polyester fiber exhibited the highest resistance to freeze-thaw while hybrid fiber usage provided a balanced enhancement across both test environments.
- Kitap BölümüYalnız künye2025Adsorption Applications of Different Clay Types for Removal of the Radioactive Wastes
Kiranşan, Murat
The nuclear fuel cycle started from the mining of uranium ore. Nuclear technology is used from medicine to agriculture, from energy to industry but it is not preferred today. Radioactive substances are used in the nuclear technology studies. Radioactive wastes emerges in different activity, physical and chemical conditions in different application field such as medicine, industry and research. Radioactive waste must be management in a safe, economical and environmentally acceptable behavior. In order to facilitate waste management, radioactive wastes are classified according to different criteria. Many different countries have developed different waste classification systems depending on the characteristics required by the waste management to be application. Wastes are processed and removal of as required by their class. Radioactive wastes are generally classified according to the level of radiation and their active time.
- MakaleAçık Erişim2025SOME PHYSICAL AND MECHANICAL PROPERTIES OF PARTICLE BOARDS PRODUCED WITH HAZELNUT HUSK AND ASTRAGALUS (Astragalus membranaceus) PLANT
Karahan, Selim; Guler, Cengiz
In this study, under laboratory conditions, hazelnut husk and astragalus plant were mixed separately into black pine wood chips, and multi-purpose boards were produced from the obtained chips with urea formaldehyde glue. After the hazelnut husk and astragalus plant were dried and ground, they were added to the chip and glue mixture in certain proportions. Hazelnut husk mixture ratios were applied as 100 %; 0 %, 75 %; 25 %, 50 %; 50 %, 25 %; 75 %, 0 %; 100 % to black pine wood chip in the particle board mixture. These ratios were made in the same way for the astragalus plant. From these mixtures, chipboard blanks of 16 mm thickness and densities between 0,68 g/cm3 and 0,72 g/cm3 were produced. Density, moisture content, thickness increase, water intake, bending strength, modulus of elasticity in bending and tensile strength perpendicular to the surface were tested in physical and mechanical experiments. According to the results obtained, as the participation rate of hazelnut shells and astragalus increased, the durability properties of the panels decreased. At the same time, it shows that the technological properties of the panels produced by adding up to 25 % astragalus plant and hazelnut shells to the mixture comply with the standards.
