Research Article:

Isam Mohamad Ali^a*, Ali Hadi Adheem^b

^{a, b} Karbala Technical Institute, Al-Furat Al-Awsat Technical University, Karbala, Iraq

E-mail addresses: ali_isam@ymail.com

ABSTRACT

Historically, the flexural behavior of hybrid fiber cement composites is not completely understood using the traditional test methods. This research presents the results of an experimental investigations on a high performance cement composites (HPCC) containing both micro steel fibers (SF) and micro polypropylene fibers (PP) before and after elevated temperature exposure. The experimental program was developed to study the flexural performance (flexural strength, toughness and stiffness) under high temperature using mono and hybrid (SF) and (SF + PP) fibers. Mixtures were divided into eight different groups, with constant w/c of 0.28 and different fibers content.
Based on the results of this research, the replacing of micro (SF) in high performance cement composites by 15 % of micro (PP) fibers is recommended at high temperature exposure due to the fact that all hybrid fiber HPCC specimens show slight decreasing in flexural behavior compared to samples reinforced with 1% volume fraction of mono steel fibers after high temperature exposure.

Keywords:  flexural strength, cementitious composites, mono and hybrid fibers, elevated temp, FRC, steel fiber, polypropylene fiber.

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Research Article:

Hassan F. Faisal^a, Khearia A. Mohammed Ali^a

Electrical Engineering Department, Basrah University, Basrah, Iraq

E-mail addresses: hassanfalih583@gmail.com

ABSTRACT

ABSTRACT

Cathodic Protection (CP) is an effective method to reduce the corrosion of metallic structures that submerged in water or buried in soil. In order to reduce the corrosion of any structure, the voltage between the metal to be protected and a reference electrode must be controlled on a preset level called the full protection level. In this paper, a boost converter circuit and

L298N integrated circuit were used as a control system to regulate the protection voltage on a preset identified range. The boost converter has been used to raise the supply voltage, while the L298N circuit has been used to regulate the boost converter voltage automatically by adjusting the duty cycle through the Arduino microcontroller.

Before the designing and implementing of the proposed controller, the effect of some different factors should be studied to understand the nature of the system and determine the controller voltage and current ranges. These factors are: The solution temperature, The dissolved oxygen, the anode-cathode distance and the power of hydrogen. The photovoltaic array was employed to impress the electrical current to the system.

Keywords: Boost Converter, Cathodic Protection, Corrosion, Impressed Current, Solar Power.

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Research Article:

Ameen Mohammed Abd-Alsalam Selami

College of Engineering, Electrical, Department, University of Kirkuk

E-mail addresses: ameen.selami@yahoo.com

ABSTRACT

It is necessary to know how a camera resolution and/or its flashlight may affect the captured image properties and features, this is essential especially for those who work in the field of image processing. If the features are modified according to the mentioned two factors, they won’t be valid for processing and analysis, therefore a study should be planed to discover the impact of the presence or absence of those two factors on image features and this was implemented by this paper. Using 11 different digital and cell phone cameras (with and without the flashlight), some histogram and texture image features showed that they change in value and level according to these factors. The Mean feature remains in the high level and does not affect when the resolution of the camera changes from the low to high resolution, but in the cell phone it almost gives medium to high levels in all cases. The Variance of an image showed that in low resolution without flashlight, the camera and cell phone give the same result which is a high level, while the Entropy feature is not affected when the device changes from the normal camera to cell phone camera. More histogram features also are studied later. Contrast feature, as being a texture feature, has a low level in high resolution without a flashlight, Energy, correlation and Homogeneity features are studied and many results were concluded to the researchers who are concerned in image processing.

Matlab 2015 and Microsoft Excel are used to complete this work

Keywords:  Image Features, Flash light, Histogram Features,Texture Features.

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Research Article:

Ala’a Hamed Emran Al-Husseini*

College of Engineering , Babylon University, Babil, Iraq

E-mail addresses: a_alhusseini16@yahoo.com

ABSTRACT

The objective of this study is to show the connection among an air pollution parameter and meteorological factors in Al-Hilla town. Data consists of daily averages of three meteorological factors (1.wind speed WS (m/s), 2.air temperature T (°C) and 3.relative humidity RH ({1524fc3db9b9185e4da51c194ca3b05c06ae483421403c447a0666442f370a52})) also, an air pollution parameter (carbon dioxide CO₂) for the period 2015-2016. In order to describe the connection between the 4 variables, the multivariate statistical analysis is used. Multiple linear regression equations are used to express the connection between meteorological parameters which represent the independent variables and concentration of air pollutant which is the dependent variable, by SPSS and Excel software. The result is: decreasing in wind speed and air temperature be accompanied by moderate decreased in CO₂ values. Increasing relative humidity be accompanied by moderate increased in CO₂ values. Linear regression analysis indicates a moderate level of connection between carbon dioxide CO₂ concentrations and the meteorological parameters in Al-Hilla city.

Keywords:  Air pollutants, meteorological parameters, correlation coefficient, regression model.

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Research Article:

Forat Yasir AlJaberi ^a* , Wadood T. Mohammed^b

^a Chemical Engineering Department, Engineering College, AL Muthanna University , Iraq.

^b Chemical Engineering Department, Engineering College, University of Baghdad

E-mail addresses: furat_yasir@yahoo.com

ABSTRACT

The aim of the present work is to analyze the phenomenon of electrodes consumption (i.e. anode and cathode electrodes) when it used in a batch electrocoagulation reactor for the removal of lead from a synthesis wastewater. The studied operational parameters were the electrolysis time (5-60) minute, pH value (2-12), applied current (0.2-2.6)Amperes, and the initial concentration of lead and the stirring speed were fixed at 155ppm and 150rpm respectively. Aluminum concentric tubes were used as electrodes by making the outer and inner as the anode electrode and the rest in between as the cathode electrode. Statistica-10 and Minitab-17 statistical programs were used to analyze responses via response surface methodology (RSM) technique to find the correlations that relate to all variables. The results show that both of electrodes had consumed and increased or decreased in that way belong to the operating variables. Applied current and pH value of the simulated solution were founded as the main effect of electrode consumption.

Keywords:  Simulated wastewater, Electrocoagulation, Electrodes consumption.

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