Autor: Çetin, I.B. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Competitiveness of Turkish Coaster Merchant Fleet: A Qualitative Analysis By Short Sea Shipping Perspective
Autorzy:: Çetin, I.B.
Akgül, E.F.
Koçak, E.
Powiązania:: https://bibliotekanauki.pl/articles/117315.pdf
Data publikacji:: 2018
Wydawca:: Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
Tematy:: Turkish coaster merchant fleet
short sea shipping
maritime industry
mediterranean sea
black sea
seafarers
Turkish
coaster merchant fleet
coaster vessel
Opis:: There is an intense competition across many sectors in the maritime industry. Coaster owners being in a market where perfect competition rules apply has to be competitive in order to survive. This study aims to analyze the competitiveness of Turkish coaster merchant fleet that consists of the vessels whose cargo carrying capacity differs from 1.000 dwt to 12.000 dwt and that carries dry bulk goods and general cargo based on short sea shipping concept covering Black Sea, Mediterranean and Continental Europe. Based on a qualitative research methodology, interviews were held and data were collected by using semi-structured questionnaire, and the data collected from the interviews was categorized in order to describe and explain patterns and themes. The findings of the interviews were analyzed within the context of sector-specific external factors and company-specific internal factors, and the competitiveness of shipowners operating in the Turkish coaster market was analyzed in detail. It is expected that the findings and implications will especially shed light on the decision makers and policy makers in the sector and contribute to the current literature.
Źródło:: TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2018, 12, 2; 389-396
2083-6473
2083-6481
Pojawia się w:: TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Determination of natural radioactivity and associated radiological hazard in excavation field in Turkey (Oluz Höyük)
Autorzy:: Çetin, B.
Öner, F.
Akkurt, İ.
Powiązania:: https://bibliotekanauki.pl/articles/1070198.pdf
Data publikacji:: 2016-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 29.40.-n
29.85.Fj
Opis:: The level of natural radioactivity may be varied with the increase in dependence of the depth into the earth. In present study, soil samples from different depths were collected in Oluz Höyük excavation area. The radionuclide concentrations in soil samples were determined by gamma-ray spectrometer which contains 3" × 3" NaI(Tl) detector connected to multichannel analyser. The photopeaks at 1460, 1764, and 2615 keV due to ⁴⁰K, ²²⁶Ra and ²³²Th, respectively, have been used. The obtained activity concentrations of ⁴⁰K, ²²⁶Ra and ²³²Th ranged from 656.03 to 1791.85 Bq/kg, 62.39 to 180.93 Bq/kg and 48.31 to 125.43 Bq/kg, respectively. To assess the radiological hazard of the natural radionuclides content in the soil samples of these area, the radium equivalent activities (the minimum value was 181.99 Bq/kg and the maximum value was 497.97 Bq/kg), the absorbed dose rate (the minimum value was 86.83 nGy/h and the maximum value was 237.22 nGy/h), annual effective dose rate (the minimum value was 0.11 mSv/y and the maximum value was 0.29 mSv/y) and external hazard index (the minimum value was 0.49 and the maximum value was 1.35) were calculated using measured activities.
Źródło:: Acta Physica Polonica A; 2016, 130, 1; 475-478
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Calculations of Double Differential Cross Sections on ⁵⁶Fe, ⁶³Cu and ⁹⁰Zr Neutron Emission in Proton Induced Reactions
Autorzy:: Karpuz Demir, N.
Çetin, B.
Akkurt, İ.
Noori, S.
Powiązania:: https://bibliotekanauki.pl/articles/1031939.pdf
Data publikacji:: 2017-09
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 13.85.Lg
13.87.Ce
Opis:: In general, the deep understanding of proton-induced reactions is a crucial step for the further development of nuclear reactions theory. However there has been an interesting focus in nuclear physics. Some applications require accurate nuclear reaction data of common cross sections and especially need the data of neutron and proton induced energy-angle correlated spectra of secondary particles, as well as double differential cross sections. Double-differential nucleon-production cross-sections of ⁵⁶Fe, ⁶³Cu and ⁹⁰Zr targets, bombarded with protons are calculated based on the nuclear theoretical models. Monte Carlo calculations with the TALYS 1.6 nuclear reaction simulation code are performed. Theoretical calculated results are compared with existing experimental data in EXFOR library.
Źródło:: Acta Physica Polonica A; 2017, 132, 3; 1181-1185
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Effects of Terpolymer Addition on the Thermal and Termomechanical Properties of Poly(Phenylene Sulfide)
Autorzy:: Cetin, B.
Sahin, A.
Yilmaz, T.
Sinmazcelik, T.
Curgul, I.
Powiązania:: https://bibliotekanauki.pl/articles/1033681.pdf
Data publikacji:: 2017-03
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 81.70.Pg
83.85.Vb
61.41.+e
Opis:: Poly(phenylene sulfide) (PPS) is one of the high-performance engineering polymers and it exhibits superior behavior, such as electrical insulation, dimensional and thermal stability, chemical resistance for various industrial applications. In addition to this, PPS has a high degree of crystallinity and it maintains these properties at high temperatures. These advantageous properties of PPS can be dependent on its chemical structure, composed of phenyl groups linked by a sulfur atom, which gives rigidity to the polymer chains. Owing to these properties, PPS is widely used in electrical and electronic components, automobile industry and mechanical applications. On the other hand, brittleness of PPS restricts its further applications. For this reason, ethylene-acrylic ester-glycidyl methacrylate terpolymer (Lotader®-AX8900) was used to overcome the brittleness of PPS. The effects of terpolymer addition on the thermal and thermomechanical properties of blends were investigated in this study. PPS/Lotader (0, 2, 5, 10 wt.% Lotader®) blends of various compositions were prepared. The blends were prepared by using laboratory scale micro compounder and injection molding machine. Thermomechanical and thermal properties of blends were investigated by means of dynamic mechanic analysis and differential scanning calorimeter test methods. As a result of this study, it was found that increasing loading level of Lotader® significantly decreased the crystallinity and increased glass transition temperature of PPS. On the other hand, Lotader® addition did not affect the melting temperature of PPS considerably. Results of dynamic mechanic analysis test revealed that while damping factor peak and loss modulus values of blends increased with the addition of Lotader®, storage modulus of blends decreased with the increasing loading level of Lotader®. When all test results are considered, it can be concluded that Lotader addition changes the brittle nature of PPS to ductile nature. In addition to this, 2 wt.% Lotader addition to PPS enables the optimum ductility for PPS without deteriorating its other properties.
Źródło:: Acta Physica Polonica A; 2017, 131, 3; 598-600
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Improvement of the Toughness and Crack Propagation Resistance Properties of Poly(Phenylene Sulfide)
Autorzy:: Cetin, B.
Sahin, A.
Karsli, N.
Yilmaz, T.
Sinmazcelik, T.
Curgul, I.
Powiązania:: https://bibliotekanauki.pl/articles/1398748.pdf
Data publikacji:: 2016-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 81.05.Qk
62.25.Mn
62.20.mm
Opis:: Poly(phenylene sulfide) (PPS) is a high-performance thermoplastic engineering polymer, which exhibits outstanding properties such as electrical insulation, dimensional and thermal stability, chemical resistance, etc. In addition to this, PPS has a high degree of crystallinity and it exhibits good physical properties at elevated temperatures. Owing to these properties, PPS is widely used in electrical and electronic components, automobile industry and mechanical applications. These outstanding properties of PPS can be attributed to its chemical structure, composed of phenyl groups linked by a sulfur atom, which gives rigidity to the chain. On the other hand, the brittleness with low elongation strain, toughness and crack propagation resistance also restricts its further applications. Several methods are used to overcome these undesirable properties of PPS. Blending of PPS with other polymers is one of these methods. In this study, Ethylene-Acrylic Ester-Glycidyl Methacrylate terpolymer (Lotader®-AX8900) was used to improve the toughness and crack propagation resistance properties of PPS. For this purpose, PPS/Lotader (0, 2, 5, 10 wt.% Lotader) blends were prepared at various compositions. The blends were manufactured using laboratory scale twin screw extruder and injection molding machine. Mechanical properties of blends were investigated by using tensile test method. In addition to this, crack propagation and toughness of samples were investigated by using essential work of fracture (EWF) method. As a result of this study, it was found that Lotader addition significantly increases the toughness and crack propagation resistance of PPS.
Źródło:: Acta Physica Polonica A; 2016, 129, 4; 683-686
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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