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Heavy-quark meson spectrum tests of the Oktay–Kronfeld action
Bailey, Jon A.,DeTar, Carleton,Jang, Yong-Chull,Kronfeld, Andreas S.,Lee, Weonjong,Oktay, Mehmet B. Springer-Verlag 2017 European Physical Journal C Vol.77 No.11
<P>The Oktay-Kronfeld (OK) action extends the Fermilab improvement program for massive Wilson fermions to higher order in suitable power-counting schemes. It includes dimension-six and -seven operators necessary for matching to QCD through order O(A(QCD)(3)/m(Q)(3)) in HQET power counting, for applications to heavy-light systems, and O(upsilon(6)) in NRQCD power counting, for applications to quarkonia. In the Symanzik power counting of lattice gauge theory near the continuum limit, the OK action includes all O(a(2)) and some O(a(3)) terms. To assess whether the theoretical improvement is realized in practice, we study combinations of heavy-strange and quarkonia masses and mass splittings, designed to isolate heavy-quark discretization effects. We find that, with one exception, the results obtained with the tree-level-matched OK action are significantly closer to the continuum limit than those obtained with the Fermilab action. The exception is the hyperfine splitting of the bottom-strange system, for which our statistical errors are too large to draw a firm conclusion. These studies are carried out with data generated with the tadpole-improved Fermilab and OK actions on 500 gauge configurations from one of MILC's a approximate to 0.12 fm, N-f = 2 + 1-flavor, asqtad-staggered ensembles.</P>
Inverse Design and Flow Distribution Analysis of Carreau Type Fluid Flow through Coat-Hanger Die
Oktay Yilmaz,Kadir Kirkkopru 한국섬유공학회 2020 Fibers and polymers Vol.21 No.1
An analytical/numerical method is revisited and proposed for process material specific design of coat-hanger dies. For this aim, both representative viscosity approach (RVA) and electrical network method (ENM) are employed incombination within an iterative calculation process. Under favour of RVA, any viscosity model from the family ofgeneralized Newtonian fluid models such as that of Carreau-Yasuda can be used within broad extrusion rate range in ENMwithout limitation in low and high values of shear rates. This provides great flexibility and accuracy in ENM which is arelatively simple and fast numerical method. First, this method is employed to design die geometry for a specificthermoplastic melt that provides uniform flow rate at the die exit. Later, the same method is modified and used to investigatethe effects of non-newtonian fluids with varying power-law indices on the die performance. Evaluation of the performance ofENM coupled with RVA (ENM-RVA) is made by computational fluid dynamics (CFD) analyses. CFD analyses indicated thatthe method is very successful in designing die geometry for a specific fluid. Flow distributions predicted by the method forvarious fluids are in accordance with those of CFD runs. The ENM-RVA is a design/analysis technique which can beemployed to see effects of material rheology and throughput on the coat-hanger die performance in a short time and can beused as an auxiliary tool which can provide the preliminary design geometry for the advanced design softwares working withoptimization algorithms.
Oktay Üçer,Ömer Demir,Mehmet Fatih Zeren,Yasin Ceylan,İlker Çelen,Ali Ersin Zümrütbaş,Gökhan Temeltaş,Ozan Bozkurt,Bülent Günlüsoy,Orçun Çelik,Gökhan Ekin,Oğuz Mertoğlu,Aegean Study Group of Society o 대한배뇨장애요실금학회 2016 International Neurourology Journal Vol.20 No.1
Purpose: To determine the proportion of patients with undetected symptoms of overactive bladder by using the overactive bladder-validated 8 (OAB-V8) screening questionnaire and investigate these symptoms were undetected in female patients who were hospitalized. Methods: We invited 2,250 female patients hospitalized in the Aegean region of Turkey to answer a self-administered questionnaire. The questionnaire included questions on evidence of lower urinary tract symptoms (OAB-V8), relevant medical history, and demographic data. Patients with a total OAB-V8 score≥8 were defined as having OAB symptoms. Results: The proportion of patients with OAB symptoms in this study was 40.6%. Nearly 57% of the patients with OAB symptoms had not been previously admitted to any hospital for lower urinary tract symptoms (LUTS). The two most common reasons why women with OAB symptoms did not admit themselves to a hospital because of LUTS were as follows: “I did not think I had a disease” and “The symptoms did not bother me,” with a response rate of 74.7%. The mean OAB-V8 scores of the patients with these two responses were significantly lower than those of the other patients (P<0.001). Conclusions: This is the first study to demonstrate a significant proportion of women with undetected OAB symptoms. The main reasons the women did not admit themselves to a hospital were their unawareness of the disease and because the LUTS were not bothersome. Public awareness programs on this disease may resolve this problem.
Oktay Algin,Efnan Algin,Gokhan Gokalp,Gokhan Ocakoglu,Cuneyt Erdogan,Ozlem Saraydaroglu,Ercan Tuncel 대한영상의학회 2010 Korean Journal of Radiology Vol.11 No.6
Objective: To evaluate the usage of duplex power Doppler ultrasound (PDUS) for the differentiation of benign and malignant thyroid nodules. Materials and Methods: We prospectively examined 77 thyroid nodules in 60 patients undergoing ultrasound-guided fine needle aspiration biopsy (FNAB). Each nodule was described according to size, inner structure, borders, parenchymal echogenicity, peripheral halo formation, and the presence of calcification (Bmode ultrasound findings). Vascularity as determined by PDUS imaging was defined as non-vascular, peripheral, central, or of mixed type. For each nodule, the pulsatility index (PI) and resistive index (RI) values were obtained. Results of FNAB and surgical pathological examination (if available) were used as a proof of final diagnosis to categorize all nodules as benign or malignant. A receiver operating characteristic (ROC) curve analysis was performed to establish cut-off, sensitivity, and specificity values associated with RI-PI values. Results: A significant relationship was observed between malignancy and irregular margins, microcalcifications, and hypoechogenicity on ultrasound examination (p < 0.05). The pattern of vascularity as determined by PDUS analysis was not a statistically significant criterion to suggest benign or malignant disease in this study (p > 0.05). The central, peripheral, and mean RI-PI values were higher in malignant nodules when compared to the other cytologies (p < 0.05). Conclusion: Vascularity is not a useful parameter for distinguishing malignant from benign thyroid nodules. However, RI and PI values are useful in distinguishing malignant from benign thyroid nodules.
Hakki Oktay Seymen,Sabiha Civelek,Arzu Seven,Gunnur Yigit,Husrev Hatemi,Gulden Burcak 연세대학교의과대학 2004 Yonsei medical journal Vol.45 No.SUP
This study was designed to investigate the effects of iron supplementation on the parameters of oxidative stress in the skeletal muscle tissue of hyperthyroidism induced rats. Hyperthyroidism was found to cause an increase in thiobarbituric acid-reactive substances (TBARS) and copper zinc superoxide dismutase (Cu, Zn SOD) activity, but decreases in the glutathione-peroxidase (GSH Px) activity and glutathione (GSH). Iron supplementation caused an increase in TBARS and a decrease in GSH. Iron supplementation in hyperthyroid rats attenuated the hyperthyroid state, but lowered the plasma ferritin level, which is considered an indicator of thyroid hormone action. Iron supplementation caused no additional increase in the TBARS in hyperthyroid rats, ameliorated the decrease in GSH content and abolished the induction of Cu, Zn SOD. Our findings suggested no increase, but a decrease, in the risk of oxidative stress in iron supplemented hyperthyroid rats. Whether supplementation of iron would have similar effects in humans should be further investigated in clinical studies.
The effect of web-based portfolio use on academic achievement and retention
Cem Oktay Gu¨ zeller 서울대학교 교육연구소 2012 Asia Pacific Education Review Vol.13 No.3
The web-based portfolio emerged as a result of the influence of technological developments on educational practices. In this study, the effect of the web-based portfolio building process on academic achievement and retention is explored. For this purpose, a study platform known as a computer-assisted personal development portfolio was designed for 30 Turkish students who participated in a web-based portfolio process. The academic achievements of the students were examined through an experimental design in which participants were divided into an experimental group and a control group and given a pre-test and a post-test. The results of the study revealed that the levels of both academic achievement and retention in the experimental group were significantly higher than those in the control group. Similar practices can be applied to the teaching of medicine, economics, physical sciences, humanities and other subjects in order to extend students' performance and achievement levels.
Bozkurt, Oktay,Inanc, Mevlude,Turkmen, Esma,Karaca, Halit,Berk, Veli,Duran, Ayse Ocak,Ozaslan, Ersin,Ucar, Mahmut,Hacibekiroglu, Ilhan,Eker, Baki,Baspinar, Osman,Ozkan, Metin Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.21
Purpose: To investigate clinicopathological features in patients with recurrent colorectal cancer within 1 year and more than 1 year after curative resection. Materials and Methods: We retrospectively evaluated 103 patients with disease recurrence before versus after 1 year of resection. Thirty-two patients (31%) were diagnosed with recurrence less than 1 year after curative resection for colorectal cancer (early recurrence) and 71 (69%) after more than 1 year (non-early recurrence). Results: The early recurrence group displayed a significantly lower overall survival rate for both colon cancer (p=0, 01) and rectal cancer (p<0.001). Inadequate lymph node dissection was a significant predictor for early relapse. There were no statistically significant differences in clinicopathological variables such as age, sex, primary tumor localization, stage, depth of invasion, lymphovascular invasion and perineural invasion between the early and non-early recurrence groups. However, a K-ras mutation subgroup was significantly associated with early recurrence (p<0.001). Conclusions: Poor survival is associated with early recurrence for patients undergoing resection for non-metastatic colorectal cancer, as well as K-ras mutation.