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Z Boson Production in pp Collisions in the Range of the Center-of-Mass Energy from 7 to 100 TeV
Hasan Ogul 한국물리학회 2018 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.73 No.3
High energy physics colliders have been contributing discoveries of and judgments on particles since the early 20th century. One of the well-known high-energy particle colliders is the large hadron collider (LHC), and its proton-proton collision energies have recently been 7, 8 and 13 TeV with the goal of reaching 14 TeV, which is the maximum capacity of the LHC. However, more physics are still to be explored and tested beyond the energy region of the LHC. Therefore, a new collider bigger than the LHC machine, which will be able to collide protons at a 100-TeV center-of-mass energy, is under consideration by the high-energy physics community. To provide insight into the transition from the LHC to the 100-TeV collider, we investigated some properties of the Z process in the collision-energy range from 7 to 100 TeV by using the HERAPDF2.0, MMHT2014, NNPDF3.1 and CT14 next-to-next-to-leading order (NNLO) parton distribution function (PDF) models at NNLO quantum chromodynamics (QCD). The considered properties are the production rate of the Z boson, the change in the uncertainties caused by the collision energy (PDF, renormalization and factorization scales, strong coupling constant, model and parameterization), the forward-backward asymmetry, and the k-factor of the Z boson.
Detailed k-Factor Studies Using Inclusive Production of W Bosons in pp Collisions
Hasan Ogul 한국물리학회 2018 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.72 No.11
The theoretical k-Factor describes the difference between leading and higher order cross sections and its proper usage has a crucial importance for theoretical predictions. In this paper, three different ways are considered to define the k-Factor of W bosons at √ s = 14 TeV in proton-proton collisions. First, we calculate k-Factors using inclusive W± boson leading order (LO), next-toleading order (NLO) and next-to-next-to-leading order (NNLO) quantum chromodynamics (QCD) cross sections with LO, NLO, NNLO parton distribution function (PDF) models, respectively. The second approach used is the calculation of k-Factors based on LO, NLO and NNLO QCD cross sections with the NNLO PDF model. The last method used here is the calculation of k-Factors using the LO QCD cross section with LO, NLO and NNLO PDF models. We further investigated the dependencies of the k-Factor on the renormalization (μR) and the factorization (μF) scales, the strong coupling constant (α s ), the charges of W boson and the collision energy of protons in a range of 7 to 100 TeV.
Hayri Ogul,Leyla Karaca,Cahit Emre Can,Berhan Pirimoglu,Kutsi Tuncer,Murat Topal,Aylin Okur,Mecit Kantarci 대한영상의학회 2014 Korean Journal of Radiology Vol.15 No.4
The purpose of this review was to demonstrate magnetic resonance (MR) arthrography findings of anatomy, variants, and pathologic conditions of the superior glenohumeral ligament (SGHL). This review also demonstrates the applicability of a new MR arthrography sequence in the anterosuperior portion of the glenohumeral joint. The SGHL is a very important anatomical structure in the rotator interval that is responsible for stabilizing the long head of the biceps tendon. Therefore, a torn SGHL can result in pain and instability. Observation of the SGHL is difficult when using conventional MR imaging, because the ligament may be poorly visualized. Shoulder MR arthrography is the most accurately established imaging technique for identifying pathologies of the SGHL and associated structures. The use of three dimensional (3D) volumetric interpolated breath-hold examination (VIBE) sequences produces thinner image slices and enables a higher in-plane resolution than conventional MR arthrography sequences. Therefore, shoulder MR arthrography using 3D VIBE sequences may contribute to evaluating of the smaller intraarticular structures such as the SGHL.
Ferdi. Akman,H. Ogul,I. Ozkan,M.R. Kaçal,O. Agar,H. Polat,K. Dilsiz 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.1
Advanced radiation applications have been widely used and extended to many fields. As a result of thisfact, choosing an appropriate shielding material based on the radiation application has become vital. Inthis regard, the integration of elements into polymer composites has been investigated and contributedto the quantity and quality of radiation shielding materials. This study reports photon attenuation parametersand electromagnetic shielding effectiveness of a novel polymer composite prepared with amatrix reinforced with three different proportions (5, 10, and 15 wt%) of niobium content. Addition of Nbdopant improves both photon attenuation and electromagnetic shielding effectiveness for the investigatedcomposites. Therefore, Nb(15%) polymer composite with highest concentration has been found tobe the best absorber for ionizing and non-ionizing radiations. Consequently, the performed analyzesprovide evidences that the prepared Nb-reinforced polymer composite could be effectively used asphoton radiation attenuator and electromagnetic shielding material
Non-deformable support system application at tunnel-34 of Ankara-Istanbul high speed railway project
C.O. Aksoy,G.G. Uyar,E. Posluk,K. Ogul,I. Topal,K. Kucuk 국제구조공학회 2016 Structural Engineering and Mechanics, An Int'l Jou Vol.58 No.5
Non-Deformable Support System (NDSS) is one of the support system analysis methods. It is likely seen as numerical analysis. Obviously, numerical modeling is the key tool for this system but not unique. Although the name of the system makes you feel that there is no deformation on the support system, it is not true. The system contains some deformation but in certain tolerance determined by the numerical analyses. The important question is what is the deformation tolerance? Zero deformation in the excavation environment is not the case, actually. However, deformation occurred after supporting is important. This deformation amount will determine the performance of the applied support. NDSS is a stronghold analysis method applied in full to make this work. While doing this, NDSS uses the properties of rock mass and material, various rock mass failure criteria, various material models, different excavation geometries, like other methods. The thing that differ NDSS method from the others is that NDSS makes analysis using the time dependent deformation properties of rock mass and engineering judgement. During the evaluation process, NDSS gives the permission of questioning the field observations, measurements and timedependent support performance. These transactions are carried out with 3-dimensional numeric modeling analysis. The goal of NDSS is to design a support system which does not allow greater deformation of the support system than that calculated by numerical modeling. In this paper, NDSS applied to the problems of Tunnel 34 of the same Project (excavated with NATM method, has a length of 2218 meters), which is driven in graphite schist, was illustrated. Results of the system analysis and insitu measurements successfully coincide with each other.
Gultekin Batuhan,Bulut Fatih,Yildiz Hatice,Us Hakan,Ogul Hasan 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.12
Radiation is the main safety issue for almost all nuclear applications, which must be controlled to protect living organisms and the surrounding materials. In this context, radiation shielding materials have been investigated and used in nuclear technologies. The choice of materials depends on the radiation usage area, type, and energy. Polymer materials are preferred in radiation shielding applications due to their superior characteristics such as chemical inertness, resistivity, low weight, flexibility, strength, and low cost. In the presented work, ABS polymer material, which is possibly the most commonly used material in 3D printers, is mixed with Gd2O3 and Er2O3 nanoparticles. ABS filaments containing these rare-earth elements are then produced using a filament extruder. These produced filaments are used in a 3D printer to create shielding samples. Following the production of shielding samples, SEM, EDS, and gamma-ray shielding analyses (including experiments, WinXCOM, GEANT4, and FLUKA) are performed. The results show that 3D printing technology offers significant enhancements in creating homogeneous and well-structured materials that can be effectively used in gamma-ray shielding applications.