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N. Arlkan,A.Iyigör,A. Candan,M. Özduran,A. Karakoç,S . U ur4,G. Ugur4,A. Bouhemadou,S. Bin-Omran,N. Guechi 대한금속·재료학회 2014 METALS AND MATERIALS International Vol.20 No.4
Pseudopotential plane-wave method based on density functional theory within the generalized gradientapproximation for the exchange-correlation potential has been applied to study the structural, electronic, elasticand vibrational properties of the binary intermetallic Pd3V and Pt3V in the L12 phase. The optimized latticeconstant, bulk modulus and its pressure derivative, independent single-crystal elastic constants and elasticwave velocities in three different directions are evaluated and compared with the available experimental andtheoretical data. The polycrystalline elastic parameters, hardness coefficient, elastic anisotropy, Debye temperatureare estimated. The electronic band structure, electronic total and partial densities of states, and totalmagnetic moment of the Pd3V and Pt3V alloys are computed and analyzed in comparison with the existingtheoretical and experimental findings. Phonon-dispersion curves and their corresponding total and projecteddensities of states were obtained for the first time using a linear-response in the framework of the densityfunctional perturbation theory.
Design optimization of a fixed wing aircraft
Yayli, Ugur C.,Kimet, Cihan,Duru, Anday,Cetir, Ozgur,Torun, Ugur,Aydogan, Ahmet C.,Padmanaban, Sanjeevikumar,Ertas, Ahmet H. Techno-Press 2017 Advances in aircraft and spacecraft science Vol.4 No.1
Small aircrafts, Unmanned Aerial Vehicles (UAVs), are used especially for military purposes. Because landing fields are limited in rural and hilly places, take-off or landing distances are very important. In order to achieve a short landing or take-off distance many parameters have to be considered, for instance the design of aircrafts. Hence this paper represents a better design to enlarge the use of fixed wing aircrafts. The document is based on a live and simulated experiments. The various components of designed aircraft are enhanced to create short take-off distance, greater lift and airflow without the need for proper runway area. Therefore, created aerodynamics of the remotely piloted aircraft made it possible to use fixed wing aircrafts in rural areas.
HERMITE BASED POLY-BERNOULLI POLYNOMIALS WITH A q-PARAMETER
UGUR DURAN,MEHMET ACIKGOZ,SERKAN ARACI 장전수학회 2018 Advanced Studies in Contemporary Mathematics Vol.28 No.2
We introduce the Hermite based poly-Bernoulli polynomi- als with a q parameter and give some of their basic properties including not only addition property, but also derivative properties and integral representations. We also define the Hermite based λ-Stirling polynomi- als of the second kind, and then provide some relations. Moreover, we derive several correlations and identities including the Hermite-Kampe de Feriet (or Gould-Hopper) family of polynomials, the Hermite based poly-Bernoulli polynomials with a q parameter and the Hermite based λ-Stirling polynomials of the second kind.
Ugur Bozlar,Mehmet Sahin Ugurel,Bahri Ustunsoz,Unsal Coskun 대한영상의학회 2008 Korean Journal of Radiology Vol.9 No.5
Although the color Doppler ultrasonography diagnosis of intestinal malrotation with midgut volvulus, based on the typical “whirlpool” appearance of the mesenteric vascular structures is well-defined in the peer-reviewed literature, the combination of both the angiographic illustration of these findings and the contemporary state-of-the-art imaging techniques is lacking. We report the digital subtraction angiography and multidetector computed tomography angiography findings of a 37-year-old male with intestinal malrotation.
Association of the XRCC1 gene polymorphisms with cancer risk in Turkish breast cancer patients
Ugur Deligezer,Nejat Dalay 생화학분자생물학회 2004 Experimental and molecular medicine Vol.36 No.6
The X-ray repair cross-complementing group 1 (XRCC1) gene is believed to play an important role in base excision repair and displays genetic polymorphisms. Data on the role of XRCC1 polymorphisms in cancer susceptibility is inconsistent. In the present study, we investigated the effect of two XRCC1 polymorphisms, Arg194Trp and Arg399Gln, on breast cancer risk in a casecontrol study involving Turkish breast cancer patients and healthy women. Both alleles exhibited a similar distribution among cases and controls leading to lack of any significant association between the XRCC1 polymorphisms and breast cancer risk, either in homozygotes and heterozygotes or combined. The allele frequency of the codon 194 variant was very low in cases and healthy individuals (5.3 and 3.9%, respectively) compared to that of the variant 399Gln allele (39.7 and 37.4%). Our results do not support evidence for a role of the XRCC1 polymorphism in developing breast cancer.
UGUR DURAN,SERKAN ARACI,MEHMET ACIKGOZ 장전수학회 2019 Advanced Studies in Contemporary Mathematics Vol.29 No.2
Motivated by the construction of the generating functions of q-Bernoulli polynomials and q-Euler polynomials satisfying with their important results, we de ne a new q-class of the Fubini polynomials. We give some new properties including correlations with the number S2;q (n; k) given in the paper. We also de ne two types q-Fubini polynomials with three parameters and then provide several correlations and identities.
Physical and Mechanical Properties of Al–Si–Ni Eutectic Alloy
Ugur Böyük 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.6
Al–11.1wt%Si–4.2wt%Ni alloy was directionally solidified upward under different conditions, with different growth rates (V=4.60–243.33 μm/s) at a constant temperature gradient (G=5.82 K/mm) and with different temperature gradients (G=2.11–5.82 K/mm) at a constant growth rate (V=11.63 μm/s) by using a Bridgman type directional solidification furnace. The microstructure of directionally solidified Al–11.1wt%Si–4.2wt%Ni alloy was observed to be irregular plates of Al3Ni and Si within an α–Al matrix from quenched samples. The microhardness, tensile strength and electrical resistivity of the alloy were measured from directionally solidified samples. The dependency of the microhardness, tensile strength and electrical resistivity for directionally solidified Al–Si–Ni eutectic alloy on the solidification parameters were investigated and the relationships between them were experimentally obtained by using regression analysis. Additionally, the variation of electrical resistivity with temperature in the range of 300-825 K for the Al–Si–Ni eutectic cast alloy was also measured using a standard d.c. four-point probe technique. The enthalpy of fusion and specific heat for the same alloy were determined by a differential scanning calorimeter from the heating curve during the transformation from eutectic solid to eutectic liquid. The results obtained in the present work were compared with previous similar experimental results.
ON SOLVABILITY OF A CLASS OF DEGENERATE KIRCHHOFF EQUATIONS WITH LOGARITHMIC NONLINEARITY
Ugur Sert Korean Mathematical Society 2023 대한수학회지 Vol.60 No.3
We study the Dirichlet problem for the degenerate nonlocal parabolic equation u<sub>t</sub> - a(||∇u||<sup>2</sup><sub>L<sup>2</sup>(Ω)</sub>)∆u = C<sub>b</sub> ||u||<sup>β</sup><sub>L<sup>2</sup>(Ω)</sub> |u|<sup>q(x,t)-2</sup> u log |u| + f in Q<sub>T</sub>, where Q<sub>T</sub> := Ω × (0, T), T > 0, Ω ⊂ ℝ<sup>N</sup>, N ≥ 2, is a bounded domain with a sufficiently smooth boundary, q(x, t) is a measurable function in Q<sub>T</sub> with values in an interval [q<sup>-</sup>, q<sup>+</sup>] ⊂ (1, ∞) and the diffusion coefficient a(·) is a continuous function defined on ℝ<sub>+</sub>. It is assumed that a(s) → 0 or a(s) → ∞ as s → 0<sup>+</sup>, therefore the equation degenerates or becomes singular as ||∇u(t)||2 → 0. For both cases, we show that under appropriate conditions on a, β, q, f the problem has a global in time strong solution which possesses the following global regularity property: ∆u ∈ L<sup>2</sup>(Q<sub>T</sub>) and a(||∇u||<sup>2</sup><sub>L<sup>2</sup>(Ω)</sub>)∆u ∈ L<sup>2</sup>(Q<sub>T </sub>).
Numerical modelling of stress and deflection behaviourfor welded steel beam-column
Ugur Soy 국제구조공학회 2012 Steel and Composite Structures, An International J Vol.12 No.3
In this study, stress and deflection behaviours of T-type welding joint applied to HE200M steel beam and column were investigated in finite element method (FEM) under different distributed loads. In the 3D-FEM modelling, glue option was used to contact between steel materials and weld nuggets. Geometrical model was designed as 3-dimensional solid in ANSYS software program. After that, homogeneous, linear and isotropic properties were used to design to materials of model. Solid-92 having 3-dimensional, 4 faced and 10-noded was selected as element type. In consequence of mesh operation, elements of 13285 and nodes of 28086 were occurred. Load distribution was applied to top surface of steel beam to determine behaviours of stress and deflection. As a result of FEM analysis applied with the loads of 55,000 N, 110,000 N and 220,000 N, maximum values were obtained as 116 N/mm2, 232 N/mm2 and 465 N/mm2 for stress and obtainedas 1,083 mm, 2,166 mm and 4.332 mm for deflection, respectively. When modelling results and classical calculation values were compared, it was obtained difference of 10 % for stress values and 2.5% for deflection values.
Comparison of steels via SMAW and MIG welding methods under industrial loads
Ugur Soy 국제구조공학회 2011 Steel and Composite Structures, An International J Vol.11 No.3
In this study, the deflection and deformation behaviours of IPN80 steel beam and column were investigated under the different industrial loads. Single-sided welds were applied to IPN80 steel beams using shielded metal arc (SMAW) and metal inert gas welding (MIG) method in the form of T-type. After that, the performance of SMAW and MIG welded joints were identified using beam bending test under 500 and 3000 N loads. SMAW and MIG methods were compared with each other to understand the deflection and deformation behaviours of the welded steel structures. Lower deformation and deflection were obtained in MIG welded steel beams. The results show that, steel beams welded MIG method has higher load capacity than SMAW welded ones. MIG welding method is more reliable than the SMAW method for the combining performance and load capacity.