November 2011
Polarization synthetic aperture radar (SAR) data for mapping coastal zone vegetation
Coastal vegetation is one of the important natural ecosystems that act as protection from sea wave erosion phenomena and supply oxygen to the surrounding organisms. POLSAR data with multi-band and multi-polarization is selected for these studies which are acquired on September 19, 2000, for coastal vegetation mapping. Two methods are performed to CVV, LHH and LHV bands: Polarization signature...
November 2011
Developing robust model for retrieving sea surface current from RADARSAT-1 SAR satellite data
This paper introduces a new approach for retrieving sea surface current from RADARSAT-1 SAR standard beam mode (S2) data. In doing so, the robust algorithm that involves the wavelength diversity ambiguity resolving (WDAR) and multi look beat frequency (MLBF) algorithms was used to remove Doppler Centroid ambiguity. The result shows that the proposed robust algorithm can acquire accurate Doppler...
November 2011
The effect of top quark mass on three jet rate and measurement of strong coupling constant
We present the calculation of top quark mass corrections to three-jet rates in electron-positron annihilation at center of mass energies of 60 and 206 GeV. Furthermore, we also calculate the effects of quark-antiquark interactions on QCD model for three-jet rates. We extract the strong coupling constant, αs, through our results from the massive three-jet rate and the massless one. We observe that the...
November 2011
Eigen spectra for Manning-Rosen potential including a Coulomb-like tensor interaction
We have obtained analytically the approximate energy equation and the corresponding wave functions of the Dirac equation for the Manning-Rosen potential coupled with a Coulomb-like tensor under the condition of the pseudo-spin symmetry using the parametric generalization of the Nikiforov-Uvarov method. The special cases of the Manning-Rosen potential for spin-1/2 particle were briefly discussed. Numerical...
November 2011
Three-dimensional coastal water front reconstruction from RADARSAT-1 synthetic aperture radar (SAR) satellite data
This paper presents work done to utilize RADARSAT-1 synthetic aperture radar (SAR) data to reconstruct 3-D of coastal water front. The velocity bunching model was used to extract the significant wave height from RADARSAT-1 SAR, while the Volterra model was used to model the front movements. B-spline also was implemented to reconstruct the front into 3-D. This study shows that the integration between...
November 2011
Structural, optical and electrical properties of ZnO thin films grown by radio frequency (rf) sputtering in oxygen atmosphere
Growth conditions for ZnO thin films were found for their potential use as a buffer layer in CdTe/CdS solar cells. Electrical, optical and structural properties were investigated as a function of the oxygen pressure during the growth of ZnO by radio frequency (rf) sputtering. The electrical behavior is explained in terms of the structural properties. Our results suggest that optimal oxygen partial pressure is...
November 2011
Study of the electrochemical redox characteristics of some thiadiazoles and their derivatives
An electrochemical study related to the redox characteristics of 2-arylaldehydehydrazono-3-phenyl-5-substituted-2,3-dihydro-1,3,4-thiadiazoles (1a-h) in nonaqueous solvents such as 1,2-dichloroethane (DCE), dichloromethane (DCM), acetonitrile (AN),dimethylsulphoxide (DMSO) and tetrahydrofurane (THF) using 0.1 mol dm-3 tetrabutylammonium perchlorate (TBAP) as a supporting electrolyte at platinum...
November 2011
Experimental investigation of spray characteristics of refined bleached and deodorized palm oil and diesel blends using phase Doppler particle analyzer
The unstable oil prices in the world market lead many countries to seek an alternative fuel to substitute petroleum oil. Palm oil derived fuel is one of such alternatives, which can be used as fuel in several methods, such as preheating, blending with other petroleum fuels, trans-esterification and etc. The objective of this paper is to characterize the spray of the refined, bleached, and deodorized palm oil...
November 2011
Study of bioactivity, biodegradability and mechanical properties of polyurethane/nano-hydroxyapatite hybrid composites
The present research is focused on the study of a series of polyurethane/nano-hydroxyapatite composites with different nano-hydroxyapatite (nHA) compositions (0, 10, 20, 30 and 40 %wt). Mechanical, biodegradability and bioactivity properties of composites were evaluated. Tensile tests were performed using a dynamic mechanical analyzer (DMA). Biodegradability and bioactivity studies were done by immersion into...
November 2011
Synthesis, structure elucidation and DFT studies of new thiadiazoles
A series of previously unavailable derivatives of coumarins were synthesized via the reaction of 4-hydroxycoumarin with ethyl bromoacetate which were then cyclized with thiosemicarbazide. The structures of all synthesized compounds were confirmed by nuclear magnetic resonance (NMR) and infra red (IR) spectroscopic techniques in addition to the use of elemental analysis method (CHN). Selected optimized...
November 2011
Structure elucidation of three new diterpene glycosides from Stevia rebaudiana
Three new minor diterpene glycosides were isolated from the commercial extract of the leaves of Stevia rebaudiana and their structures were identified as 13-[(2-O-b-D-glucopyranosyl-b-D-glucopyranosyl)oxy] ent-kaur-15-en-19-oic acid b-D-glucopyranosyl ester (1),13-[(2-O-b-D-glucopyranosyl-3-O-b-D-glucopyranosyl-b-D-glucopyranosyl)oxy]ent-kaur-15-en-19-oic...
November 2011
The exp-function method for new exact solutions of the nonlinear partial differential equations
In this article, the exp-function method is used to construct some new exact solitary wave solutions of the sixth-order Boussinesq equation and the regularized long wave equations. These equations play very important role in mathematical physics, engineering sciences and applied mathematics. The exp-function method is a powerful and straightforward mathematical tool for solving nonlinear evolution...
November 2011
Flow of an incompressible micropolar fluid through an elliptic pipe under a constant pressure gradient
The study of the flow through pipes and channels either closed or open is a classical problem. In this paper, we make a theoretical investigation of the flow of an incompressible micropolar fluid through a straight elliptic pipe of uniform cross section under a constant pressure gradient. In any micropolar fluid flow problem, there is a need to determine two independent flow field vectors which...
November 2011
Frenet-Serret motion and ruled surfaces with constant slope
In this paper, we study Frenet-Serret motion and ruled surfaces with constant slope in Euclidean 3-space. By applying Frenet-Serret motion to the points of a cone, we obtain ruled surfaces with constant slope and we investigate these surfaces. We give the definition of a Smarandache curve in Euclidean 3-space. Also, we define a new type of general helix curves on a ruled surface in Euclidean...
November 2011
A novel method for object detection based on graph theory
Ideal object detection result in an image is an optimal free shape sub-window that tightly covers the object of interest. However, the sub-windows considered in widely-used sliding window method are limited to rectangles. This paper proposed a new graph-theoretic method which allowed the detection sub-window to be any shape for object detection. Firstly, local features responses were calculated by...
November 2011
Adaptive feature extraction and mapping for mobile robots in unknown environment
This paper proposes a new approach for feature and line extraction use in mobile robot mapping with high accuracy, efficient speed and low complexity to determine line boundaries. This algorithm called modified split and merge (MSAM) is robust against measurement noises and demonstrates satisfactory results on different surfaces. The method is based on the least square method to fit a line to a series of...
November 2011
Towards a more sustainable surface raw water tariff structure in the Vaal basin: A situational analysis
With an increasingly urbanised population, further study was necessary to determine if water could be used more efficiently by applying efficient tariff structures in combination with decision support tools in the form of models. This paper highlighted challenges towards establishing a sustainable surface raw water tariff structure. Limitations of using the pollute-pays principle for setting a surface raw...
November 2011
Flood management to prevent flooding damages in western Black Sea region in Turkey
River flooding is the most frequently experienced natural hazard all over the World. The effects of flooding are mainly related to the function of the intensity and distribution of precipitation, and the rate of filtration of water into the soil and rock, vegetation and topography. Flood management is considered as one of the basic strategies that can reduce flood damages and in this context, flood protection...
November 2011
Titanium dioxide as photocatalyses to create self cleaning concrete and improve indoor air quality
Air inside buildings can be more polluted than outdoor because there are various sources of pollution in some big cities. This paper presents the results of a study on the efficiency of contributing air cleaning agents such as Titanium dioxide (TiO2) into the technique of producing concrete composite panels, using local waste materials for solving the problem of carbon dioxide (CO2) in indoor air buildings....
November 2011
Removing sediment transport in open channel with submerged aquatic vegetation: Laboratory study
Vegetation affects fluvial processes and is key role in river management in particular sediment transport. Vegetation characteristics such as vegetation’s density, height and distributions have significant effect on sediment transport in vegetated channel. This paper studied the role of aquatic vegetation characteristics in sediment transport. Laboratory experiments were conducted in a fabricated...
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