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Design of Coanda Intakes for Optimum Sediment Release Efficiencies
Oğuz Hazar,Sebnem Elçi 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.2
When the water has to be diverted from a turbid source having a great amount of suspended materials in it, bottom intake structures such as Coanda and Tyrolean types are preferred. To perform this task, diverted water is captured by a transversal rack, and a gallery located in the control crest is utilized. This study was motivated by a search for the best design where the quality of the diverted water can be increased by screening out most of the sediments in the flow. Current work focuses on the water capture and sediment release efficiencies of both Tyrolean and Coanda type intakes through experimental work. It complements and extends existing experimental studies by considering sediment-laden flow. We used a novel sediment feeding system designed specifically for this study in the experiments. Study results pointed out that when sediment release efficiency is considered, all types of Coanda intakes having different design parameters performed better as compared to Tyrolean intakes. Water capture and sediment release efficiencies are related to parameters used in the experiments including Coanda type, rack angle, void ratio, sediment amount, and flow rate based on the statistical analyses of these parameters. An optimum design is proposed with the maximum sediment release efficiency to prevent clogging during the operation of the intakes.
A new paranormed series space using Euler totient means and some matrix transformations
G. Canan Hazar Gulec,Merve Ilkhan 강원경기수학회 2020 한국수학논문집 Vol.28 No.2
Paranormed spaces are important as a generalization of the normed spaces in terms of having more general properties. The aim of this study is to introduce a new paranormed space $ \left\vert \phi _{z}\right\vert \left( p\right) $ over the paranormed space $ \ell \left( p\right) $ using Euler totient means, where $p=\left( p_{k}\right) $ is a bounded sequence of positive real numbers. Besides this, we investigate topological properties and compute the $ \alpha -,\beta -,$ and $\gamma $ duals of this paranormed space. Finally, we characterize the classes of infinite matrices $(\left\vert \phi_{z}\right\vert \left( p\right) ,\lambda )$ and $(\lambda ,\left\vert \phi_{z}\right\vert \left( p\right) ),$\ where $\lambda $ is any given sequence space.
Meriem Laraba,Sana Hazar Tachour,Hanene Belbache,Nassima Boubekri,Radja Djebbari,Fadila Benayache,Samir Benayache,Djamila Zama 경희대학교 융합한의과학연구소 2022 Oriental Pharmacy and Experimental Medicine Vol.22 No.4
Doxorubicin (DOX) is a potent anticancer drug; its use has been limited by its hepatotoxicity, which is due to free radicals generation. This work aims to investigate whether the n-butanol soluble part of the 70% methanol extract of the aerial parts of Moricandia arvensis, alleviates doxorubicin-induced hepatotoxicity. According to the literature data, Moricandia arvensis (Brassicaceae) is renowned for its richness in flavonoid and phenolic acid glycosides. In this work, we have rightly assessed the total phenolic and flavonoid contents of the studied extract (n-butanol extract). The results obtained (TPC: 86.25 ± 0.00 μg GAE/mg; TFC: 22.54 ± 0.01 μg QE/mg) encouraged us to continue our investigations. Wistar albino rats were orally administered with n-butanol extract of M. arvensis (50 mg/kg and 100 mg/kg body weight) or vitamin E as a standard antioxidant (100 mg/kg) for 10 days; and DOX (15 mg/kg on the 8th day that was intraperitoneally injected. At the end of the experiment, blood and liver samples were analyzed for biomarker levels and histopathological changes. Liver homogenates were used to determine oxidative stress parameters such as malondialdehyde (MDA), glutathione peroxidase ( GPX) and glutathione (GSH) activity. DOX-administered rats significantly increased different levels of the serum biochemical parameters, increased TBARS level, decreased GPx activity and GSH level in the liver. In addition, M. arvensis (50 mg/ kg and100 mg/kg) n-butanol extract treatments significantly decreased the level of TBARS, increased GSH level and GPx activity compared to the DOX-treated rats (p < 0.01). The histological study revealed the hepatoprotective effects of the tested extract on DOX-induced toxicity. This was demonstrated by the preservation of hepatic architecture as well as a reduction in structural and functional changes in the liver. The obtained results indicate a protective action of n-butanol extract of M. arvensis that could be the result of the inhibition of reactive oxygen species (ROS) generation. This may be the result of the presence of phenolic compounds in M. arvensis plant.
Acetalization of Carbonyl Compounds by Using Silica-bound Sulfuric Acid under Green Condition
Mirjalili, Bi Bi Fatemeh,Zolfigol, Mohammad Ali,Bamoniri, Abdolhamid,Hazar, Azizeh Korean Chemical Society 2004 Bulletin of the Korean Chemical Society Vol.25 No.6
Aldehydes and ketones were converted to their corresponding acetals in the presence of silica-bound sulfuric acid in n-hexane under mild and heterogeneous conditions with excellent yields.
Abdurrezzak Börekçi,Mustafa Gür,Caner Türkoğlu,Ahmet Oytun Baykan,Taner Şeker,Durmuş Yıldıray Şahin,Hazar Harbalıoğlu,Zafer Elbasan,Mustafa Topuz,Murat Çaylı 대한심장학회 2016 Korean Circulation Journal Vol.46 No.1
Background and Objectives: It has been demonstrated that the neutrophil/lymphocyte ratio (NLR) might be a useful marker to predict cardiovascular risk and events. We aimed to investigate the role of the NLR to predict ventricular remodeling (VR) in patients with anterior ST-elevation myocardial infarction (STEMI) who were treated with primary percutaneous coronary intervention. Subjects and Methods: We prospectively included 274 consecutive anterior STEMI patients. Echocardiography was performed during admission and at six months after myocardial infarction. VR was defined as at least 20% increase from baseline in left ventricular end- diastolic volume. Patients were divided into two groups according to their VR status: VR (n=67) and non-VR (n=207). Total and differential leukocyte count, N-terminal pro-brain natriuretic peptide (NT-proBNP) and other biochemical markers were measured at admission and 24 hours later. Results: Compared with the non-VR group, peak creatine kinase MB (CK-MB), NT-proBNP (24 h), neutrophil/lymphocyte ratio, presence of diabetes, no-reflow frequency and wall motion score index were significantly higher in patients with VR (p<0.05 for all). On multivariate logistic regression analysis, NLR (β=2.000, 95% confidence interval=1.577-2.537, p<0.001) as well as peak CK-MB, NT-proBNP (24 h), WMSI and diabetes incidence were associated with VR. The cutoff value of the neutrophil/lymphocyte ratio obtained by receiver operator characteristic curve analysis was 4.25 for the prediction of VR (sensitivity: 79 %, specificity: 74%). Conclusion: In patients with anterior STEMI, initial NLR and NT-proBNP measured 24 hours after admission may be useful for predicting adverse cardiovascular events including left VR.