Person: BEYİT, ALİ
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BEYİT
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ALİ
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Publication Metadata only Investigation of electromagnetic shielding properties of needle-punched nonwoven fabrics with stainless steel and polyester fiber(SAGE PUBLICATIONS LTD, 2013) BEYİT, ALİ; Ozen, Mustafa Sabri; Sancak, Erhan; Beyit, Ali; Usta, Ismail; Akalin, MehmetIn this study, electromagnetic shielding properties of needle-punched nonwoven fabrics were investigated. The paper evaluates and compares the electromagnetic shielding of needle-punched nonwoven fabrics produced from stainless steel/polyester and normal polyester fibers. Stainless steel/polyester fiber and normal polyester fiber were blended at specified ratios in the experimental study. Webs were produced from the fibers with the carding machine and then bonded with the needle-punching machines. The thickness and electromagnetic shielding properties of the needle-punched fabrics were tested. An electromagnetic shielding effectiveness (EMSE) device was used for measuring the electromagnetic shielding. The experimental study indicated that as the conductive stainless steel fiber ratio in nonwoven fabrics increases, the EMSE also increases at low, medium and high frequencies. Satisfactory electromagnetic shielding values were obtained at wide bandwidth, i.e. 1200-3000 MHz. The highest EMSE values of the needle-punched nonwoven fabric with 25% conductive steel fiber were, respectively, 6 dB at 0-300 MHz low frequency, 12 dB at 300-1200 MHz medium frequency and 18 dB at 1200-3000 MHz high frequency. It was found that 90% of electromagnetic waves were shielded by nonwoven fabric at high frequencies, 85% at medium frequencies and 80% at low frequencies.Publication Metadata only Development of bio-composite structures for Interior noise reduction in automobiles(2018-12-07) PARS, ABDULKADİR; SANCAK, ERHAN; BEYİT, ALİ; ÖZEN, MUSTAFA SABRİ; YÜKSEK, METİN; USTA, İSMAİL; PARS A., SANCAK E., BEYİT A., ÖZEN M. S. , YÜKSEK M., USTA İ.Publication Metadata only Electrospinning of single and multilayered scaffolds for tissue engineering applications(TAYLOR & FRANCIS LTD, 2017) BEYİT, ALİ; Erdem, Ramazan; Yuksek, Metin; Sancak, Erhan; Atak, Onur; Erginer, Merve; Kabasakal, Levent; Beyit, AliOptimized electrospinning conditions were applied to produce single and multilayered (ML) scaffolds composed of polycaprolactone, collagen and elastin. The ML scaffold was cross-linked with glutaraldehyde to increase the stability. Morphological and structural characteristics of the scaffolds were measured by SEM and FTIR analyses. Results revealed that polymers combined to each other well and uniform fibers were obtained with the diameters ranging from 156 +/- 53 to 1536 +/- 293 nm. Contact angle measurements were performed to investigate the hydrophilic character of each structure. It was observed that incorporation of the natural polymers into the blends increased the hydrophilicity. Mechanical tests proved that collagen contributed to fabricate stiffer structures while elastin provided more elasticity. Biocompatibility of the scaffolds was examined by SEM analysis and WST-1 test with mouse fibroblast cells (L929) in vitro. Results exhibited that the addition of natural polymers increased the cell growth, and none of the single and ML scaffolds presented cytotoxic effect.Publication Open Access Thermal and Mechanical Properties of Walnut Shell and Glass Fiber Reinforced Thermoset Polyester Composites(ASIAN JOURNAL OF CHEMISTRY, 2013) BEYİT, ALİ; Onat, Ayhan; Pazarlioglu, S. Serdar; Sancak, Erhan; Ersoy, Sezgin; Beyit, Ali; Erdem, RamazanRecent studies have shown that focusing on industrial waste materials will enable us to recover the economical. values. In line with the objective of present study, walnut shell is a waste material was selected to ensure economic recovery. Furthermore, biaxial fiber glass based fabrics were used in order to improve the mechanical properties of the composite materials to be produced. Thermosetting polyester resin was used as matrix material in producing composite materials. Nine different composite materials were produced as a result of addition of walnut shells at different sizes and ratios. Mechanical tests and thermal conductivity tests of these composite materials were carried out and the results were assessed.