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Yapici, Kerim 한국유변학회 2012 Korea-Australia rheology journal Vol.24 No.1
In this computational study, the convergence, stability and order of accuracy of several different numerical schemes are assessed and compared. All of the schemes considered were developed using a normalized variable diagram. Two test cases are considered: (1) two-dimensional steady incompressible laminar flow of a Newtonian fluid in a square lid-driven cavity; and (2) creeping flow of a PTT-linear fluid in a lid-driven square cavity. The governing equations are discretized to varying degrees of refinement using uniform grids, and solved by using the finite volume technique. The momentum interpolation method (MIM) is employed to evaluate the face velocity. Coupled mass and momentum conservation equations are solved through an iterative SIMPLE (Semi-Implicit Method for Pressure-Linked Equation) algorithm. Among the higher-order and bounded schemes considered in the present study, only the CLAM, COPLA, CUBISTA, NOTABLE, SMART and WACEB schemes provide a steady converged solution to the prescribed tolerance of $1{ \times}10^{-5}$ at all studied Weissenberg ($We$) numbers, using a very fine mesh structure. It is found that the CLAM, COPLA, CUBISTA, SMART and WACEB schemes provide about the same order of accuracy that is slightly higher than that of the NOTABLE scheme at low and high Weissenberg numbers. Moreover, flow structures formed in the cavity, $i.e.$ primary vortex, are captured accurately up to $We$ = 5 by all converged schemes.
Rheological characterization of polyethylene glycol based TiO2 nanofluids
Kerim Yapici,Nese K. Cakmak,Naciye Ilhan,Yusuf Uludag 한국유변학회 2014 Korea-Australia rheology journal Vol.26 No.4
Rheological characterization of TiO2 nanoparticle dispersions in polyethylene glycol (PEG 200) is presentedover 1-10 wt% particle mass fraction range in terms of shear viscosity, thixotropy and linear viscoelasticity. A stress controlled rheometer fitted by a cone-and-plate system was employed for the rheologicalmeasurements between –10oC and 40oC. The non-linear viscoelastic experiments revealed that TiO2-PEG200 nanofluid exhibits a shear thinning behavior when particle mass fraction exceeds 1%. No appreciablechange in the shear viscosity versus shear rate behavior was detected over the course of four days ofdispersion storage. At high particle concentrations the dispersions had a yield stress that was determined byfitting the results through Herschel-Bukley model. Within the studied range of particle concentration, noevidence of thixotropic behavior was observed. In addition, relative viscosity measured at high shear regionwas found to be independent of the temperature. On the other hand, strong temperature dependency wasobserved at low shear region particularly at high temperatures. Storage and loss moduli of the TiO2-PEG200 nanofluid were determined by frequency sweep measurements with applied stresses in the linearviscoelastic region. It was found that when the applied stress is lower than the corresponding yield stressTiO2-PEG 200 nanofluid showed a gel structure especially at high particle mass concentration.
Kerim Yapici,Yusuf Uludag 한국유변학회 2013 Korea-Australia rheology journal Vol.25 No.4
Computational results for steady laminar flow of three different shear thinning fluids lid-driven square cavity are presented. The viscoelastic nature of the fluids is represented by linear and exponential Phan-Thien Tanner (PTT) and Giesekus constitutive models. Computations are based on finite volume technique incorporating non-uniform collocated grids. The stress terms in the constitutive equations are approximated by higher-order and bounded scheme of Convergent and Universally Bounded Interpolation Scheme for the Treatment of Advection (CUBISTA). Effects of the elasticity, inertia as well as constitutive model parameters on the stress and velocity fields, size and intensity of the primary and secondary vortexes are investigated and discussed in detail. Moreover highly accurate benchmark numerical solutions are provided for each considered constitutive model.
Kerim Yapici 한국유변학회 2012 Korea-Australia rheology journal Vol.24 No.1
In this computational study, the convergence, stability and order of accuracy of several different numerical schemes are assessed and compared. All of the schemes considered were developed using a normalized variable diagram. Two test cases are considered: (1) two-dimensional steady incompressible laminar flow of a Newtonian fluid in a square lid-driven cavity; and (2) creeping flow of a PTT-linear fluid in a lid-driven square cavity. The governing equations are discretized to varying degrees of refinement using uniform grids, and solved by using the finite volume technique. The momentum interpolation method (MIM) is employed to evaluate the face velocity. Coupled mass and momentum conservation equations are solved through an iterative SIMPLE (Semi-Implicit Method for Pressure-Linked Equation) algorithm. Among the higher-order and bounded schemes considered in the present study, only the CLAM, COPLA, CUBISTA, NOTABLE, SMART and WACEB schemes provide a steady converged solution to the prescribed tolerance of 110-5 at all studied Weissenberg (We) numbers, using a very fine mesh structure. It is found that the CLAM, COPLA, CUBISTA, SMART and WACEB schemes provide about the same order of accuracy that is slightly higher than that of the NOTABLE scheme at low and high Weissenberg numbers. Moreover, flow structures formed in the cavity, i.e. primary vortex, are captured accurately up to We = 5 by all converged schemes.
Mercan Sevcan,Akcakaya Nihan Hande,Salman Baris,Yapici Zuhal,Ozbek Ugur,Sibel Aylin Ugur Iseri 한국유전학회 2023 Genes & Genomics Vol.45 No.1
Background Syndromic intellectual disability (ID) with accompanying primary microcephaly is a group of rare neurodevelopmental disorders exhibiting extreme genetic and clinical heterogeneity. This layered heterogeneity can partially be resolved by unbiased genetic approaches targeting the genome with next generation sequencing (NGS) technologies, including exome sequencing (ES). Objective This study was performed to dissect the clinical and genetic features in five distinct IDM cases. Methods Singleton or trio ES approach followed by in-depth variant analysis using alternative inheritance models was performed. Results We have identified biallelic loss of function variants in genes WDR62 and AP4M1 in three families, together with de novo missense variants in genes SOX11 and TRIO in two families. ES based haplotype analysis in two cases upon identification of an identical WDR62 variant in the homozygous state in two cases was suggestive of a small shared haplotype of 0.1 Mb. Additionally, we have shown a paternal origin for the de novo variant in TRIO via a polymorphic tag SNP, which enlightens the mutational mechanism for this variant. Conclusion In populations with high parental consanguinity, an autosomal recessive inheritance pattern for data analysis is usually the most obvious choice. Therefore, heterozygous variants may be overlooked in standard NGS analyses in consanguineous families. Our findings underlie the importance of using multiple inheritance models in NGS data analysis.
Relapsed Wilms' tumor with multiple brain metastasis
Akakin, Akin,Yilmaz, Baran,Eksi, Murat Sakir,Yapicier, Ozlem,Kilic, Turker The Korean Pediatric Society 2016 Clinical and Experimental Pediatrics (CEP) Vol.59 No.no.sup1
Wilms' tumor is the most common malignant renal tumor in childhood. The brain metastasis of a Wilms' tumor with anaplastic histopathology is rare. We present the case of an 8-year-old girl with Wilms' tumor, who presented with multiple brain metastases 5 years after her primary diagnosis. The brain masses were diagnosed after a generalized tonic-clonic seizure attack. The big solid mass in the cerebellum was resected, and whole-brain radiotherapy was performed, after which, she succumbed to her disease. In the case of clinical suspicion, cranial surveillance should be included in the routine clinical work-up for Wilms' tumor. Combined aggressive therapy (surgery+radiotherapy+chemotherapy) should be applied whenever possible, for both better survival and palliative aspects.
Duran, Ayse Ocak,Karaca, Halit,Besiroglu, Mehmet,Bayoglu, Ibrahim Vedat,Menekse, Serkan,Yapici, Heves Surmeli,Yazilitas, Dogan,Bahceci, Aykut,Uysal, Mukremin,Sevinc, Alper,Hacibekiroglu, Ilhan,Aksoy, Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.23
Background: XELOX plus bevacizumab (XELOX-Bev) and FOLFIRI plus Bevacizumab (FOLFIRI - Bev) treatments are an effective strategies patients with metastatic colorectal cancer (mCRC).The aim of this study was to compare efficacy of first-line XELOX-Bev treatment vs FOLFIRI-Bev treatment for mCRC. Materials and Methods: A total of 409 patients with mCRC who received chemotherapy were included and divided into 2 groups. Group 1 (n=298) received XELOX-Bev and Group 2 (n=111) FOLFIRI-Bev. Comparisons were made in terms of overall (OS) and progression-free (PFS) survival, response rate (RR), and grade 3-4 toxicity. Results: Median follow-up was 11 months in Group 1 and 15 months for Group 2. Complete remission was observed in 29 (9.7%) and 2 (1.8%) patients, partial remission in 139 (46.6%) and 27 (24.5%), stable disease in 88 (29.5%) and 49 (44.1%) and progressive disease in 42 (14.1%) and 33 (30.0%) patients in Group 1 and 2, respectively. Median OS was 25 months (range 2-57 months, 95%CI; 22.2-27.7) for Group 1 and 20 months (range 1-67 months, 95%CI; 16.8-23.1) for Group 2 (p=0.036). Median PFS was 9.6 months (range 2-36 months, 95%CI; 8.8-10.4) for Group 1 and 9 months (range 1-44 months, 95%CI; 7.4-10.5) for Group 2 (p=0.019). Objective RR was 56.4% in Group 1 and 26.1% in Group 2 (p<0.001). Conclusions: First-line XELOX-Bev is more effective with a better response rate, prolongation of median PFS/OS, and a superior safety profile compared with FOLFIRI-Bev.
Effect of Stress Aging Induced Precipitates on Corrosion Behavior of NiTi Shape Memory Alloys
A. Radi,J. Khalil‑Allafi,A. Heidarzadeh,G. G. Yapici,M. R. Etminanfar,S. Z. Mozafari,B. Rezaei‑Moghadam 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.10
In this study, the influences of the stress aging process on the electrochemical behaviors toward evaluating corrosion resistanceof NiTi shape memory alloys in the in-vitro condition have been investigated. For this approach, the samples havebeen manufactured by introducing multiple precipitation morphology in the alloy structure via applying different levels ofstresses during the aging process. The samples were characterized using multiply electron microscopy, electrochemicalmethods, X-ray diffraction, and differential scanning calorimetry. Results show that by prolonging aging time from 1 to 5 hand increasing the stress aging level (15–60-150 MPa) the corrosion resistance improves, which is implied a better formationof a protective layer. It seems that homogeneous precipitation of Ni-rich phases under the stress aging process improvesthe corrosion resistance of the alloy.