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Z. Fuat Toprak,Nizamettin Hamidi,Ozgur Kisi,Resit Gerger 대한토목학회 2014 KSCE JOURNAL OF CIVIL ENGINEERING Vol.18 No.2
Learning the Longitudinal Dispersion (LD) mechanism in natural channel is vitally important to be able to control water pollutionand to prevent different stratification in flow that crucial for water resources conservation for both human and aquatic life. Manyrelated studies can be found in the existing literature. However, almost all studies aim to investigate the mechanism of the LD innatural channels or to model dimensional LD coefficient. The main goal of this work is to develop three models based on differentartificial neural network techniques to predict dimensionless (not dimensional) LD coefficients in natural channels. Another goal ofthis study is to present a large and critical assessment on the existing studies made on both dimensional and dimensionless LD. Thedata sets obtained from the literature concerning more than 30 rivers at different times in the United States of America, include thedepth, the width, and the mean cross-sectional velocity of the flow, shear velocity, and dimensionless longitudinal dispersioncoefficient. The results have been compared with the data at hand, a fuzzy based model, and seven conventional equations proposedin literature by using statistical magnitudes, error modes, and contour map method. It is observed that the feed forward neuralnetwork yields the best reliable results.
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Arslan, Cavit,Pirinc, Abdurrahman,Eker, Nizamettin,Sur, Emrah,Undag, Ilknur,Kusat, Tansu Asian Australasian Association of Animal Productio 2022 Animal Bioscience Vol.35 No.5
Objective: The study aimed to evaluate the effects of a mixture of encapsulated essential oils (EOs) addition on nutrient digestion, serum biochemical parameters, peripheral blood alpha-naphthyl acetate esterase (ANAE), and acid phosphatase (ACP-ase) positive lymphocyte ratios and intestinal morphology in laying hens. Methods: A total of 320 laying hens of 48-wk-old were randomly allotted into 4 treatment groups with 10 replicates of 8 birds in each replicate. The birds were fed a basal diet (control) or the diet added with mixture of EOs (which consist of eugenol, nerolidol, piperine, thymol, linalool, and geraniol) at 50, 100, and 200 mg/kg for period of 84 days. Results: The addition of EOs at 100 or 200 mg/kg increased the dry matter, organic matter, and crude protein digestion as compared to control. The addition of all doses of EOs did not affect serum gamma glutamyl transferase, alanine aminotransferase, and P but increased serum asparate aminotransferase (AST) concentration. The addition of 200 mg/kg EOs increased serum creatinine, while 100 mg/kg decreased Ca concentration. The addition of 100 and 200 mg/kg EOs generally improved ANAE and ACP-ase positive peripheral blood lymphocyte ratios and intestinal morphology. Conclusion: It can be concluded that, the addition of 100 or 200 mg/kg encapsulated EOs generally increased apparent nutrient digestion and serum AST concentration, improved ANAE and ACP-ase positive peripheral blood lymphocytes and intestinal morphology in laying hens.
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Dissolution kinetics of calcined ulexite in ammonium carbonate solutions
As m K?nk?l,Nizamettin Demirkran 한국화학공학회 2007 Korean Journal of Chemical Engineering Vol.24 No.6
leaching kinetics of calcined ulexite in ammonium carbonate was studied in this work. The effect ofparameters of ammonium carbonate concentration, solid/liquid ratio, stirring speed, calcination temperature and reac-ammonium carbonate concentration, reaction temperature and decreasing solid/liquid ratio. However, the effect of stir-ring speed on the conversion rate was insignificant. The experimental data practised the heterogeneous and homo-geneous models, and an acceptable model for the conversion rates of ulexite was determined to be a first-order pseudo-homogeneous reaction model. The activation energy of dissolution process was determined to be 35.3 kJ/mol.
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