May 2013
Numerical investigation on the effect of different parameters on the performance and the emission of a spark ignition (SI) engine
In this work, NISSAN Z24 engine was simulated numerically and valves and ignition timings were modified in order to improve the engine performance and emissions. The engine was simulated using a version of the Los Alamos code KIVA-3V2 which is a computer program for the numerical calculation of transient, two and three dimensional chemically reactive flows with sprays. The computational grid was generated by the...
May 2013
Unsteady magnetohydrodynamic (MHD) thin film flow of a third grade fluid with heat transfer and no slip boundary condition down an inclined plane
An investigation is made for unsteady magnetohydrodynamic (MHD) thin film flow of a third grade fluid down an inclined plane. The non-linear partial differential equation governing the flow and heat transfer are reduced to a system of non-linear algebraic equations using implicit finite difference approximation to obtain velocity and temperature profile. The effect of various physical parameter on both velocity and...
May 2013
Water defluoridation by bauxite-gypsum magnesite (B-G-Mc) based filters calcined at 350 – 500°C
Research was carried out at Ngurdoto research station in Tanzania to ascertain the potential development of a water filter made of bauxite, gypsum and magnesite in an attempt to enhance the availability of low-fluoride water. The materials were sourced within Tanzania. The X-Ray fluorescence technique showed that the major components of the materials were: bauxite: Al2O3 (30.33%), SiO2 (15.0%) and...
May 2013
Mineral and heavy metal by inductively coupled plasma optical emission spectrometer in traditional Turkish yogurts
Yogurt, a traditional Turkish dairy product is common in all region of Turkey. The different heavy metals were determined in commercial yogurts by inductively coupled plasma optical emission spectrometer (ICP–OES). Concentrations of calcium (Ca), phosphorus (P), sodium (Na), magnesium (Mg), aluminum (Al), zinc (Zn), iron (Fe), copper (Cu), manganese (Mn), boron (B), molybdenum (Mo), cadmium (Cd), cobalt (Co),...
May 2013
Principally supplemented module and lifting property
The purpose of this paper is to further study the concept of a very important module theory namely principally supplemented modules. Therefore, our work presents some properties of the relation between lifting property and principally supplemented module. Also we will focus on quasi-discrete module to study principally supplemented in general way. We prove that if R be principal ideal ring and if M be indecomposable...
May 2013
Fuzzy cell mapping on dynamical systems
Fuzzy cell mapping is a novel computational technique that combines fuzzy logic and a simple cell mapping method. In a simple cell mapping method, the information about mapping locations of image cells is never incorporated into the method. This limits the usage of a simple cell mapping method. In our fuzzy cell mapping method, we account for the mapping locations of image cells and incorporate the information by...
May 2013
Iris localization through Hough clustering
Occlusion, reflections and iris shape deformations are the obstacles that stand in the way of a complete solution to iris localization problem. How to reject outliers caused by occlusion and reflections as much as possible before ellipse or spline fitting is a key challenge. For this reason, we proposed a Hough clustering method, which utilizes the shape configuration of iris edge points and their local appearance...
May 2013
Enhancement of cutting tool surface coating quality using ionized gaseous medium (IGM)
The use of ionized gaseous medium (IGM) to prepare a hard alloy material surface by grinding and its effect on the coating quality was investigated. During grinding, IGM was fed to the cutting area by different methods namely: clockwise (longitudinal), anticlockwise (opposed) and transverse (Cross) feeding, respectively. Thereafter, the samples were coated with a titanium nitride on a modern vacuum, ionizing apparatus...
May 2013
Dimensional stability of mirror materials for opto-mechanical reference system
Sensors, IR beams and lasers used in many opto-mechanical systems have stringent alignment retention requirements for use over an extended temperature range. Thermal effects are the primary cause for alignment drift during operation. Thermal expansion and contraction of materials can result in dimensional instability of mirror surfaces. This paper focuses on the importance of dimensional stability of mirror materials in...
May 2013
The effects of various drip fertigated water quantities on flavonoid and anthocyanin content on hydroponically cultivated Cucumis sativa L.
The effects of various quantities of water were assessed on their potential to influence the content of flavonoid and anthocyanin contents in different tissues of cucumber plants grown hydroponically in the greenhouse. The treatments included supplying eight different water quantities 2, 4, 6, 8, 10, 12, 14 and 16 L/h. The plants received water five times a day, making it 10, 20, 30, 40, 50, 60, 70 and 80 L/day. The...
May 2013
The effects of adding the aluminum sulfate to the urea formaldehyde adhesive applied on plywood
In the present study, the effects of adding the aluminum sulfate to the urea-formaldehyde (UF) adhesive, on the bonding characteristics and free formaldehyde content, have been studied. Experiments were conducted on the three layered plywood of ekaba (Tetraberlinia bifoliolata) and poplar (Populus x eureamericana), prepared by adding aluminum sulfate to the adhesive mixtures of these tree species in certain amounts....
May 2013
Combustion properties of Rowan wood impregnated with various chemical materials
The common use of Rowan wood (Sorbus aucuparia Lipsky) in the forest products industry of Turkey, was evaluated for some of the combustion properties after impregnation with various chemical materials. For this purpose, the wood test samples prepared from Rowan wood materials according to TS 345 were treated with Tanalith-E, Vacsol-Azure, Imersol-Aqua and Boron compounds (Borax and Boric asid) by the vacuum...
May 2013
The effects of heat treatment on some mechanical properties of laminated black pine (Pinus nigra)
Black pine (Pinus nigra) has high industrial usage potential and large plantation in Turkey. Larch wood was treated with heat to determine its mechanical properties, such as bending strength and pressure and order to determine its adhesion strength. Laminating adhesives are used for the construction of polyvinyl acetate and polyurethane. Heat treatment was applied to the samples at 100-150°C for 4 h in drying oven....
May 2013
Production and evaluation of activated carbon from palm kernel shells (PKS) for economic and environmental sustainability
Activated carbon (AC) was produced from palm kernel shells (PKS) by acid activation method at temperature of 600°C. The effects of carbonization and acid impregnation time on the adsorption potential of the ACs on purification of contaminated rain and flowing river water bodies were examined. The results were compared with results of similar analysis based on commercial AC purchased from a nearby chemical shop. The...
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