Sürdürülebilir Kalkınma Amaçları

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• MakaleAçık Erişim2025/r/munzur/4629
  EFFECT OF GRAPHITE AND MAX PHASE ON THE THERMAL AND DIELECTRIC PROPERTIES OF N-VINYL CARBAZOLE AND BENZYL METHACRYLATE COPOLYMER

  Barim, Esra; Gundogdu, Emrah

  In this study, the P(N-vinyl carbazole-co-benzyl methacrylate) copolymer was synthesized, characterized by FT-IR/1H-NMR spectroscopic methods, and its composition was calculated from 1H NMR spectra. Composites of the copolymer with four different ratios of graphite (GR) and MAX phase (Ti3AlC2) by weight were prepared to obtain functional and novel electronic components for energy storage applications. Scanning electron microscopy, X-ray diffraction analyses were performed for some samples. Differential scanning calorimetry, thermogravimetric analysis curves were used to determine the thermal behavior of the materials. It was concluded that the composite with the highest glass transition temperatures and thermal stability was the composite with 10wt%GR/10wt%MAX additive. The thermal degradation kinetics of the copolymer and the composite containing 10wt%GR/10wt%MAX were investigated by applying the Flynn-Wall-Ozawa (FWO), Kissinger-Akahira-Sunose (KAS) methods and it was found that the thermal degradation activation energy of the composite was lower than that of the polymer. The dielectric properties of the materials were investigated at room temperature and between 0.1 kHz and 5 kHz. At 1 kHz the dielectric constants of the copolymer and 10wt%GR-doped composite were found to be 2.22 and 12.31, respectively. The composites doped with 10wt%GR and 10wt%GR/10wt%MAX were confirmed to be semiconductors.

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• MakaleAçık Erişim2024/r/munzur/4367
  ASSESSMENT OF URBAN FLOOD RISKS OF THE CITIES USING ENTROPY-VIKOR METHODS IN TURKIYE

  Derse, Onur; Polat, Elifcan Gocmen

  In recent years, there is growing interest for evaluation of urban flood risks of cities over the past decade due to rapid urbanization and climate change. The optimal flood risk assessment is strategically achieved not only with classical risk modelling approaches but also with holistic and comprehensive framework. This paper focuses on a detailed flood assessment providing risk database for policymakers and urban planners to decide the flood prone areas in Turkey. In this context, the Entropy based VIKOR (VIseKriterijumska Optimizacija Kompromisno Resenje) was provided to evaluate a range of flood risk criteria named number of floods, population density and number of buildings, flood protection area which are under the concept of risk dimension including hazard, exposure and vulnerability aspects. Computational results demonstrate that the provinces of & Scedil;anl & imath;urfa, Ordu, Zonguldak and Van are assigned with higher urban risk values, respectively and the ranking of the cities was presented with different q values. The findings should support practitioners and researchers for land use planning and risk reduction works as the detailed flood risk evaluation was presented in terms of the flood management.

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  AtıfWoS4·OpenAlex5

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• MakaleYalnız künye2020/r/munzur/5903
  Investigation of Phase Change Materials on the Use of Trombe Walls for Thermal Energy Storage Systems

  Erdem, Necla Seval; Orhon, Ahmet Vefa

  This study is conducted to determine the contribution of phase change materials (PCM) and trombe walls (TW) for energy efficiency and it is aimed to identify the criterias that is required during design process. In this study, after giving general definitions about PCM and TW, domestic and foreign literature is searched and application examples are analyzed and compared. It is observed that phase changing trombe wall (PCTW) application alleviated the heavy mass of the wall unlike the traditional methods and PCM increased the efficiency of heating and cooling applications by providing latent heat storage to the massive wall. Although TW has simple application schemes, there are some difficulties in achieving full efficiency. It can be confusing to predict how a PCTW, whose details are decided, will respond to environmental conditions throughout the whole year. Accordingly, considering the criteria that will affect the system before designing the PCTW, it will increase efficiency to see possible problems that the wall may face. In the PCTW system, which is planned to be designed in a specific climate zone, the most efficient result can be achieved by optimization of these criterias.

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  AtıfOpenAlex1

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