January 2012
Trace and determinant inequalities for Hadamard products
In this paper, several inequalities involving positive integer powers of the Hadamard product of two matrices are presented. Firstly, a new upper bound for the product of their determinants and an inequality that relates the trace of the power of the Hadamard product of two matrices are given. Also, an alternative proof of the theorem established by Ulukok and Turkmen (2010) was given on the Frobenius norm of the power...
January 2012
An accurate numerical model for charge density in ballistic carbon nanotube field effect transistors (CNTFETs)
Since the discovery of carbon nanotube (CNT), a great deal of groups pays more attention to it due to its unique properties. The theory of ballistic transport carbon nanotube field effect transistors (CNTFETs) is presented in the paper, and then a numerical model based on Newton-Raphson and linear approximation method for charge densities in CNTFET is proposed. The model could efficiently provide accurate solution to...
January 2012
The electrostatic potential at the center of associative magic squares
Magic squares are one of the most wonderful math discussions which make a lot of scientific questions and problems in math and other sciences, very difficult to solve. With such a great world and with such history and long antiquity, their usages in physics are not so much. This work studies magic squares together with some physical concepts and in fact it analyzes the electrostatic potential at the center of natural...
January 2012
Harmonic suppression of microstrip ring resonator using double spurlines
This paper presents a new design of microstrip ring resonator with harmonic suppression using double spurlines. Double spurlines are introduced for harmonic suppression in the proposed ring resonator with the purpose of circuit size miniaturization. The spurline structures force the proposed resonator to resonate only at the fundamental mode. It is shown that the harmonics can be suppressed by introducing double...
January 2012
Companies’ performance in stock exchanges: Using sequential patterns-algorithm
This paper communicates the overall behaviour of the stock exchange. Basically, stock exchange is marketing for companies/group(s) assets to sell their shares and in-return generates revenues to invest and grow their company/business. The attitude of giant investors keeps on changing their move to destabilise the market so that the trivial investors cannot become stable/grow and compel to sell their shares on less...
January 2012
Lanthanide complexes of {(5-phenyl-1,3,4-oxadiazol-2-yl)thio}acetic acid: Synthesis, characterization and preliminary in vitro antibacterial screening activity
A total of four new lanthanide complexes of {(5-phenyl-1,3,4-oxadiazol-2-yl)thio}acetic acid (ligand, HL) with the metal ions [La(III), Nd(III), Gd(III) and Dy(III)] have been successfully prepared in alcoholic medium. The complexes obtained are characterized quantitatively and qualitatively by using microelemental analysis, Fourier transform infrared spectroscopy (FTIR) spectroscopy, ultraviolet-visible...
January 2012
Toxicity evaluation for low concentration of chlorophenols under solar radiation using zinc oxide (ZnO) nanoparticles
Photo catalytic degradation of chlorophenols in aqueous solution by ZnO nanoparticles under sunlight was investigated. The toxicity of chlorophenols was evaluated by agar plates technique with paper discs in the presence of Escherichia coli. The relative toxicity data of chlorophenols, before and after degradation, was used in comparing between them. The degree of toxicity was estimated by...
January 2012
Molecular dynamics simulation of sodium dodecyl sulfate in the presence of bovine carbonic anhydrase: Behavior of water
The subject of this study is on the effect of sodium dodecyl sulfate (SDS) on water properties. We have studied the structure and dynamic behavior of water at different concentrations of sodium dodecyl sulfate in the presence of bovine carbonic anhydrase (BCA) by means of molecular dynamics simulation. The water oxygen to SDS oxygen radial distribution function, the relative frequency of water hydrogen forming none, 1...
January 2012
Removal of Pb(II) from aqueous solution using hydrotalcite-like nanostructured material
Novel nanostructured hydrotalcite (HT) adsorption medium was prepared and its ability to remove Pb(II) from aqueous solution was demonstrated. The media was characterized using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), transmission electron microscope (TEM) and Themogravimetric Analysis (TGA). Batch adsorption was chosen in which changes in solution pH, initial concentration and...
January 2012
Full non-rigid group theory and symmetry of some diborane derivatives
The full non-rigid (f.NRG) molecules group theory is seen to be used advantageously to study the internal dynamics of such molecules. In this work, a computational method is applied to study the f.NRG of cis- and trans- dimethyl diborane, trimethyl diborane and tetramethyl diborane with different point groups. We considered the point groups of them and computed the other, conjugacy classes and the corresponding symmetry...
January 2012
New variational iteration decomposition method for solving twelfth order boundary value problems
In this paper, we introduced a new iterative method for solving twelfth order boundary value problems. The analytical results of the equations have been obtained in terms of convergent series with easily computable components. This new technique is a combination of variational iteration method and the decomposition method. We have taken two examples to illustrate the effectiveness of variational iteration decomposition...
January 2012
A new technique for systems of Abel-Volterra integral equations
Extension of a computational method for solving a special kind of singular system is the novelty of this paper. These systems are called systems of Abel Volterra integral equations. This method is based on the application of Legendre wavelets, as a basis functions for numerical solutions. Some examples are presented to illustrate the efficiency and the simplicity of the method. Key words: Systems of Abel...
January 2012
Timelike-spacelike Mannheım partner curves in IR31
In this paper, timelike-spacelike Mannheim partner curve couple was defined in Lorentzian space and the relations were given between the curvatures and torsions of these curves. Furthermore, for a given curve couple, the necassary and sufficient conditions were obtained to become timelike-spacelike Mannheim partner curve couple in . Key words: Mannheim curves,...
January 2012
Integrating anchored instructional strategy and modularity concept into Interactive multimedia PowerPoint presentation
This study is based on the cognitive theory of multimedia learning to propose an alternative presentation integrating anchored strategy and modularity concept into a Microsoft PowerPoint presentation for classroom learning. With the anchored instructional strategy and rich visual interactivity, the presentation helps students to acquire more information and remember more ideas. In addition, incorporated hyperlinks and...
January 2012
Text clustering on latent semantic indexing with particle swarm optimization (PSO) algorithm
Most of web users use various search engines to get specific information. A key factor in the success of web search engines are their ability to rapidly find good quality results to the queries that are based on specific terms. This paper aims at retrieving more relevant documents from a huge corpus based on the required information. We propose a particle swarm optimization algorithm based on latent semantic...
January 2012
Using mobile geographic information system (GIS) techniques to develop a location-based tour guiding system based on user evaluations
This study developed a mobile tour guiding system which uses mobile geographic information system (GIS) techniques to provide spatial and guiding information based on user evaluation. The system comprises four main functions, a graphic function, a global positioning system (GPS) function, a route function and a query function. A user evaluation of the system allows the voicing of different opinions and user perceptions...
January 2012
Investigation of electrical treeing in cable grade crosslinked polyethylene (XLPE) insulations
Using PC-based on-line monitoring system, extensive measurements were performed in insulation blocks cut from the crosslinked polyethylene (XLPE) insulation of 36, 69 and 132 kV rated cables produced in Saudi Arabia. A needle-plane electrode system was used with a needle radius of 10 mm. The role of 'applied voltage step-time duration' and associated time resolved initiation and growth of different types of...
January 2012
Evaluation of corrosion inhibiting admixtures for steel reinforcement in concrete
Inhibitors are added to concrete to improve its quality and integrity. The various inhibitors used in the construction industry to salvage the book or service life of steel reinforcement in concrete structures are broadly classified into organic and inorganic corrosion inhibitors and other methods which include cathodic protection, coatings to the reinforcement, penetrating sealers and chloride removal. In recent years,...
January 2012
Nitrate in drinking water: A major polluting component of groundwater in gulf region aquifers, south of Togo
Hydrochemical investigations of groundwater have been carried out on objectives of evaluating groundwater quality. Groundwater quality contaminations have emerged in many geographical areas due to natural environmental processes and human intervention in the geosystems. Geochemical evaluation of nitrate contaminated groundwater in Gulf region was investigated. Results showed that most of the...
January 2012
Examining the sensibilities of the different sectors active in Düzce concerning clean production
Industry, having become the backbone of development and economic improvement today, increases the pressure on the natural resources, but it has carried the environmental problems to unresolvable levels. Some developed countries realising the seriousness of the issue developed various methods, techniques and technologies to reduce the environmental effects of the industry. “Clean production”, which was put...
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