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Anees Abdullah Khadom 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.12
This paper reports the results of mass loss measurements in the corrosion inhibition of mild steel in different concentrations of H3PO4 in the temperature range 30-60 oC using potassium iodide as an inhibitor. The present work is focused on determining the optimum mathematical equation and the ANN architecture in order to gain good prediction properties. Three mathematical equations and three ANN architectures are suggested. Computer aided program was used for developing these models. The results show that the polynomial mathematical equation and multi-layer perception are able to accurately predict the measured data with high correlation coefficients.
Corrosion Inhibition of Copper-nickel Alloy: Experimental and Theoretical Studies
Khadom, Anees A.,Yaro, Aprael S.,Musa, Ahmed Y.,Mohamad, Abu Bakar,Kadhum, Abdul Amir H. Korean Chemical Society 2012 대한화학회지 Vol.56 No.4
The corrosion inhibition of copper-nickel alloy by Ethylenediamine (EDA) and Diethylenetriamine (DETA) in 1.5M HCl has been investigated by weight loss technique at different temperatures. Maximum value of inhibitor efficiency was 75% at $35^{\circ}C$ and 0.2 M inhibitor concentration EDA, while the lower value was 4% at $35^{\circ}C$ and 0.01 M inhibitor concentration DETA. Two mathematical models were used to represent the corrosion rate data, second order polynomial model and exponential model respectively. Nonlinear regression analysis showed that the first model was better than the second model with high correlation coefficient. The reactivity of studied inhibitors was analyzed through theoretical calculations based on density functional theory (DFT). The results showed that the reactive sites were located on the nitrogen (N1, N2 and N4) atoms.
Hemodynamic Flow in a Vertical Cylinder with Heat Transfer
Farhad Ali,Anees Imtiaz,Ilyas Khan,Nadeem Ahmad Sheikh,Dennis Ling Chuan Ching 한국자기학회 2018 Journal of Magnetics Vol.23 No.2
In blood, the concentration of red blood cells varies with the arterial diameter. In the case of narrow arteries, red blood cells concentrate around the centre of the artery and there exists a cell-free plasma layer near the arterial wall due to Fahraeus-Lindqvist effect. Due to non-uniformity of the fluid in the narrow arteries, it is preferable to consider the two-phase model of the blood flow. The present article analyzes the heat transfer effects on the two-phase model of the unsteady blood flow when it flows through the stenosed artery under an external pressure gradient. The direction of the artery is assumed to be vertical and the magnetic field is applied along the radial direction of the artery. Blood is considered as a non-Newtonian Casson fluid with uniformly distributed magnetic particles. Both the blood and magnetic particles are moving with distinct velocities. This two-phase problem is modelled using the Caputo-Fabrizio derivative approach and then solved for an exact solution using joint Laplace & Hankel transforms. Effects of pertinent parameters such as Grashoff number, Prandtl number, Casson fluid parameter and fractional parameters, and magnetic field on blood velocity and particle velocity have been shown graphically for both large and small values of time. Both velocity profiles increase with the increase of Grashoff number and Casson fluid parameter and reduce with the increase of magnetic field and Prandtl number. The behaviour of temperature is studied for different values of the fractional parameter.
Khalid Hamid Rashid,Anees Abdullah Khadom 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.8
The performance of sodium molybdate (Na2MoO4) (VI) as a corrosion inhibitor for medium carbon steel corrosion in saline water containing nitrate and chloride ions was studied at various inhibitor concentrations, temperatures, exposure times and rotational velocities. Mass loss and electrochemical techniques were used to evaluate the corrosion rates. The individual and interactive effects of these four parameters were optimized for minimum response of corrosion rate using central composite design (CCD) with response surface methodology (RSM). Nonlinear regression strategy in light of Gauss-Newton technique was utilized for modeling and optimization of the corrosion inhibition experiments. Second-order polynomial model was suggested to predict the corrosion rates as a function of four variables. The individual effect of temperature on corrosion rate was higher than the individual effects of inhibitor concentration, exposure time and rotational velocity, respectively. The interaction effects of independents variables were also addressed. Open circuit potential measurements were used as a significant way to gain information about the behavior of steel corrosion. Steady state potential was reached after one hour of immersion time. Mass loss results were in a good agreement with potentiodynamic polarization technique. Optimum inhibition efficiency was 95.9% at optimum operating conditions. Polarization plots revealed that the inhibitor acts as the anodic-type inhibitor.
Naing, K. W.,Anees, M.,Kim, S. J.,Nam, Y.,Kim, Y. C.,Kim, K. Y. UNIV. OF MILAN DEPARTMENT OF FOOD SCIENCE AND MICR 2014 ANNALS OF MICROBIOLOGY Vol.64 No.1
Soilborne fungal phytopathogens cause significant losses in many economically important crops and vegetables. The only way to control these devastating pathogens is by using higher doses of fungicides which not only increase the cost of production but also cause significant damage to the environment. Therefore alternate control measures are always looked for. In the present study, an antagonistic strain was isolated from the soil of the pepper fields around the seashore of Jellanamdo, South Korea and identified as Paenibacillus ehimensis KWN38 based on 16S rRNA sequencing. The strain showed high antifungal activity against six tested fungal pathogens belonging to various taxonomic groups on dual culture plates. Furthermore, the strain produced volatile antimicrobial compounds which had strong fungal growth inhibitory effect. The strain also showed high chitinase, cellulase, glucanase and protease activities. The hyphal morphologies of Rhizoctonia solani AG-1 (IA), Fusarium oxysporum f.sp. lycopersici and Phytophthora capsici were significantly destroyed by the crude enzymes and butanol extract from the culture supernatant and the affected hyphae showed abnormal bending, tip curling, and irregular branching. Hence, Paenibacillus ehimensis KWN38 is considered as a potential biocontrol agent of the soil-borne fungi causing plant diseases which is an important perspective of the present study.