Yazar "İçelli, Orhan" seçeneğine göre listele

Listeleniyor 1 - 6 / 6
  • Küçük Resim
    Öğe
    A Monte Carlo-based approach to determine effective atomic numbers of low-Z explosives in landmines
    (TAYLOR & FRANCIS LTD, 2-4 PARK SQUARE, MILTON PARK, ABINGDON OR14 4RN, OXON, ENGLAND, 2025) Özşahin Toker, Melis; Yavaş, Kübra; Toker, Ozan; İçelli, Orhan
    Landmines pose significant humanitarian and strategic challenges, threatening both civilian populations and military operations worldwide. This study presents a practical simulation method based on Rayleigh and Compton scattering ratios to determine the effective atomic number of low atomic number (low-Z) explosives used in landmines. Utilizing the Monte Carlo N-Particle (MCNP) simulation program, Rayleigh/Compton scattering ratios were obtained using a Ge(Li) detector at a scattering angle of 115° within a simulated geometry. The simulation results were found to be in good agreement with experimental data, confirming the reliability of the method. Pure elements with atomic numbers ranging from 3 to 20 and various explosives were irradiated with photons of 59.54 keV energy to obtain scattering spectra. The effective atomic numbers calculated using Rayleigh/Compton scattering ratios were compared with five different theoretical methods, yielding consistent results. These findings demonstrate that the proposed method can reliably determine the effective atomic number of low-Z elements and explosives containing these elements. Additionally, the study confirms that MCNP simulations can be effectively utilized in various fields such as defense industry, radiation safety, medical applications, and radiation dosimetry.
  • Küçük Resim
    Öğe
    Artificial Neural Networks Study on Prediction of Dielectric Permittivity of Basalt/PANI Composites
    (İstanbul Gelişim Üniversitesi Yayınları / Istanbul Gelisim University Press, 2016-06-22) Eyecioğlu, Önder; Karabul, Yaşar; Alkan, Ümit; Kılıç, Mehmet; İçelli, Orhan
    In the present study, the dielectric permittivity change of basalt (two type basalt; CM-1, KYZ-13) reinforced PANI composites were studied to determine the effects of PANI additivities (10.0, 25.0, 50.0 wt.%) at several frequencies from 100 Hz to 17.5 MHz by a dielectric spectroscopy method at the room temperature and artificial neural networks (ANNs) simulation. Also, the dielectric permittivity at 30.0 wt.% of PANI additivity was obtained by ANNs without experimental process. That process, a significant predictive instrument was produced which allows optimization of dielectric properties for numerous composites without substantial experimentation. It has been observed that PANI additivities decreased to dielectric constant of composites at low frequencies. Furthermore, the ANNs method have satisfactory accuracy for prediction of dielectric parameters.
  • Küçük Resim
    Öğe
    The Effects of PANI Concentration on the Mechanical Properties of PP/PANI Composites
    (Afyon Kocatepe University, 2018) Kılıç, Mehmet; Alkan, Ümit; Karabul, Yaşar; Berber Yamak, Hale; İçelli, Orhan
    In this study, the effect of PANI additive with different concentrations (0.3-3.0 wt.%) on mechanical properties of Polypropylene/Polyaniline (PP/PANI) film composites have been investigated. The composites films obtained from the hot pressing technique have been characterized to determine their surface properties and structural morphology (SEM and FT-IR), thermal properties (TG). The effects of PANI additive on mechanical properties of polypropylene have been examined by tensile tests. In particular, tensile strength, Young's modulus and percentage strain at break of the composites have been tested. According to our results, it has been observed that the PANI additive in polypropylene had a significant impact on its mechanical properties. The tensile strength has been reached highest value in PP/0.6 wt.% PANI composites.
  • Küçük Resim
    Öğe
    Effects of the γ-irradiation strength and basalt additive content on the mechanical performance and dielectric response of polypropylene films
    (WILEY, 111 RIVER ST, HOBOKEN 07030-5774, NJ, 2019) Kılıç, Mehmet; Güven Özdemir, Zeynep; Alkan, Ümit; Karabul, Yaşar; İçelli, Orhan
    In this study, we investigated the effects of high-dose ?-ray irradiation on the mechanical and dielectric properties of polypropylene (PP)–basalt thick films. PP–basalt thick-film composites with various basalt contents from 0.5 to 10.0% were prepared by a hot-press method. The samples were exposed to ? radiation at different doses in the range 3–25 kGy. The mechanical properties of the samples, such as the Young’s modulus, tensile strength, percentage strain at break, and energy at break, were examined in the context of the ?-irradiation process. Although the maximum elasticity was obtained for the unirradiated 0.5% basalt-added composite, the 6 kGy ?-irradiated PP–1.0% basalt sample exhibited the highest elasticity properties among all of the composites. The best mechanical properties, including the ultimate tensile strength and energy at break values, were achieved for the 12 kGy ?-irradiated neat PP. The dielectric properties of the PP–basalt composites were also investigated in the 100 Hz to 15 MHz frequency region at room temperature. According to the analysis of the dielectric properties, the 3 kGy ?-irradiated neat PP may have potential for microelectronic device applications that require low dielectric constant and dielectric loss materials.
  • Küçük Resim
    Öğe
    Gamma-Ray Irradiation Effect on Mechanical and Dielectric Properties of Volcanic Basalt Mineral Reinforced Low Density Polyethylene Films
    (OFICYNA WYDAWNICZA POLITECHNIKI WROCLAWSKIEJ, WYBRZEZE WYSPIANSKIEGO 27, 50-370 WROCLAW, POLAND, 2017) Kılıç, Mehmet; Karabul, Yaşar; Alkan, Ümit; Yağcı, Özlem; Okutan, Murat; Okutan, Mustafa; İçelli, Orhan
    The aim of the work is to study the mechanical and dielectric properties of low density polyethylene (LDPE) that can be modified by basalt mineral under low dose gamma irradiation. The composite films are prepared by a hot pressing method (15 MPa, 418 K, for about 10 min), and then irradiated by Co-60 gamma-rays in the dose range varied between 6 and 24 gray (Gy). Mechanical and dielectric properties of these samples are examined by means of stress-strain measurements and dielectric spectroscopy in the frequency range of 100 Hz –15 MHz at the room temperature. Experimental measurements evidence that the mechanical properties of LDPE were weakened by basalt additives and radiation. The tensile strength of 0.5 wt.% basalt additivity, which has an optimum value increased by 30 percent when compared to pure LDPE without radiation. When LDPE and LDPE/basalt composites were radiated between 6 to 24 Gy, the mechanical properties of both samples decreased at almost the same rate. The LDPE/ 0.5wt.% basalt composite sample without gamma-irradiation was the one with the highest mechanical strength. In the absence of radiation, the low (static) frequency real part of dielectric constant is increased with basalt additives. The dielectric strength reached a maximum value up to 20.0 wt.% basalt additive at 6 Gy dose. However, the polymeric structure of the sample was deteriorated.
  • Küçük Resim
    Öğe
    X-ray irradiated LDPE/PP blends with high mechanical and dielectric performance
    (WILEY, 111 RIVER ST, HOBOKEN 07030-5774, NJ, 2018) Alkan, Ümit; Kılıç, Mehmet; Karabul, Yaşar; Çağlar, Mustafa; İçelli, Orhan; Güven Özdemir, Zeynep
    In this study, the influences of polypropylene (PP) additive (varying from 20% to 80% wt) and low dose X-ray irradiation (changing from 25 to 100 Gy) on the mechanical and dielectric properties of low-density polyethylene (LDPE) were investigated. LDPE/PP film blends were prepared by hot press technique. While the highest Young modulus and tensile strength were observed for the 20%LDPE/80%PP blend at 25 Gy X-ray irradiation, the same blend had the highest energy at break and percentage strain at break values for 50 Gy X-ray exposure. These results also indicated a chain scission in the material. The differential scanning calorimetry curves also indicated a chain scission and crosslinking effects in the blends due to X-ray irradiation. Hence, the higher concentration of PP additive and exposure of low dose X-ray resulted in a polymer composite with high mechanical performance. On the other hand, the dielectric investigations revealed that the 25 Gy X-ray irradiated 20%LDPE/80%PP blend may also attract attention for capacitor applications due to its increased static dielectric constant and reduced dielectric loss.