January 2012
An overview of crumb rubber modified asphalt
Roadways are considered one of the most important elements of infrastructure and they play an essential role in our daily lives. In road pavement construction, the use of crumb rubber in the modification of bitumen binder is considered as a smart solution for sustainable development by reusing waste materials. It is believed that crumb rubber modifier (CRM) could be one of the alternative polymer materials in improving...
January 2012
Enhanced superconducting properties of the Pb doped trilayer high-temperature (Bi2Sr2Can-1CunO2n+4δ) cuprate superconductor
A ceramic superconductor compounds with the composition Bi2Sr2Can-1CunO2n+4δ were prepared by solid state reaction from the principle routs like Bi-2212,Ca2CO3 and CuO with high purity of 99.99%. Different measurement such as resistivity measurement, X-ray diffraction (XRD) and scanning electron microscope (SEM) were made to show the improvement in the superconductivity of the high phase. The lattice...
January 2012
Microscopic dynamics of a large-scale pedestrian evacuation model
Numerous models have been developed for estimating the time required to evacuate from a variety of places under various conditions. For high-traffic places, such as commercial and industrial buildings, it is vital to be able to accurately calculate the evacuation time required in order to ensure the safety of the occupants. To this end, various models of pedestrian dynamics have been proposed, either as a whole system...
January 2012
Effects of induced magnetic field and slip condition on peristaltic transport with heat and mass transfer in a non-uniform channel
We study the effects of induced magnetic field and slip on the peristaltic flow of Jeffrey fluid in a non-uniform channel. Flow analysis is discussed in the presence of heat and mass transfer. Main emphasis is given to the study of stream function, the longitudinal pressure gradient, the magnetic force function, the axial induced magnetic field, the current density, the temperature and concentration. Numerical...
January 2012
Radioactivity of local tobacco and some selected brands of cigarettes
This study investigated the radioactivity levels of locally consumed tobacco and three (3) popular brands of cigarettes. The Ortec X-ray fluorescence spectroscopy (XRF) with model number XL12170 was used to determine the radioactivity and elemental composition of each of the samples. All the samples were found to be radioactive with the following elements, including-K, Ca, Ti, Cr, Mn, Fe, Pb, Rb, Sr, Zr and Nb. From the...
January 2012
Nanocarbonfibril in rice flour charcoal
This paper presents the results of a study of nanocarbonfibrils in charcoals, which were prepared from rice flour with diameters of 90, 75 and 38 µm, respectively. The rice flours were carbonized for 30 min at a temperature of 600 to 800°C. The carbonized products were characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), Fourier transform infrared spectrometer (FTIR),...
January 2012
Study on unified implicit methods for solving variational inequalities
In this paper, we suggest and analyze some new implicit methods for solving the variational inequalities. These new methods include the extra gradient method of Korpelevich (1976) and the modified extra gradient method of Noor (2004, 2010) as special cases. We also consider the convergence of this new implicit iterative method under some conditions. The ideas and techniques of this paper may stimulate further research...
January 2012
Operational matrix approach for the nonlinear Volterra-Fredholm integral equations: Arising in physics and engineering
An approximation method based on hybrid Legendre polynomials and Block-Pulse functions used for the solution of nonlinear Volterra-Fredholm integral equations (NV-FIEs). The operational matrices of these functions are utilized to reduce a nonlinear Volterra-Fredholm integral equation to a system of nonlinear algebraic equations. In addition, convergence analysis and numerical examples that illustrate the pertinent...
January 2012
Study of nonlinear KdV type equations via homotopy perturbation method and variational iteration method
The Korteweg-de Vries (KdV) equation is the champion of model equations of nonlinear waves. In fact, it is from numerical experiments of a water wave equation. The objective of this paper is to present a comparative study of He's homotopy perturbation method (HPM) and variational iteration method (VIM) for the semi analytical solution of three different Kortweg-de Vries (KdV) type equations called KdV, K(2,2,) and...
January 2012
Ordering a class of unicyclic graphs with respect to Merrifield-Simmons index
The Merrifield-Simmons index is one of the most popular topological indices in chemistry and in mathematical properties; there is a correlation between this index and boiling points. The Merrifield-Simmons index of a graph is defined as the total number of its independent sets, including the empty set. This paper proposed an edge grafting theorem operation, which is certain kind of edge moving between two vertices...
January 2012
Hopf bifurcation analysis of a food web of four species
In this paper, we analyze the Hopf bifurcation of basic food web of four species based on standard normal form theory. The basic model we consider is owed to a bottom prey X, two competing predators Y and Z on X, and a super-predator W only on Y. It is found that periodic solutions arise from the main parameter values and through through a Hopf bifurcation point. The...
January 2012
Fast Fourier transform technique for the European option pricing with double jumps
In this paper, we provided a fast algorithm for pricing European options under a double exponential jump-diffusion model based on Fourier transform. We derived a closed-form (CF) representation of the characteristic function of the model. By using fast Fourier transform (FFT) technique, we obtained an approximation numerical solution for the prices of European call options. Our numerical results show that our method is...
January 2012
Optimizing a multi-product and multi-supplier the economic production quantity model using genetic algorithm
In order to make the economic production quantity (EPQ) model more applicable to real-world production and inventory control problems, in this paper, we expand this model by assuming that some imperfect items of different product types are being produced such that reworks are allowed. In addition, we may have more than one product and supplier along with warehouse space and budget limitation. We show that the model of...
January 2012
Anti-synchronization of chaotic neural networks with time-varying delays via linear matrix inequality (LMI)
In this paper, anti-synchronization problem of two identical chaotic neural networks with time-varying delays is proposed. By using time-delay feedback control technique, mean value theorem and the Leibniz-Newton formula, and by constructing appropriately Lyapunov-Krasovskii functional, sufficient condition is proposed to guarantee the asymptotically anti-synchronization of two identical chaotic neural networks. This...
January 2012
Applying the fuzzy analytic network process to the selection of an advanced integrated circuit (IC) packaging process development project
In the modern business environment, process technology evaluation and selection (PTES) is a crucial component of innovation in new product development (NPD). The most difficult task for project managers in PTES is to make the optimal technology choice for a Research and Development (R&D) project, and there are many attendant uncertainties and risks in process technology R&D projects for NPD. Recently, Integrated...
January 2012
Modeling the machining parameters of AISI D2 tool steel material with multi wall carbon nano tube in electrical discharge machining process using response surface methodology
This work investigates the machining characteristics of American Iron and Steel Institute (AISI) D2 tool steel with copper as a tool electrode during electrical discharge machining (EDM) process. The multi wall carbon nano tube (MWCNT) is mixed with dielectric fluids in EDM process to analyze the surface characteristics of surface roughness. Regression model were developed to predict the surface roughness (SR) in EDM...
January 2012
Capacitor bushing optimization via electrostatic finite element analysis
In high-voltage capacitor bushings, there is maximum field intensity at the edge of the aluminum foil and where foils overlap. Any technique decreasing much field intensity in those regions will significantly optimize the bushings’ electrostatic characteristics. This paper presents the study of the effect of edge diversion in the overlapped region of an aluminum foil and of the shape of aluminum foil edge in...
January 2012
Groundwater exploration using geoelectrical resistivity technique at Al-Quwy’yia area Central Saudi Arabia
Geoelectrical resistivity surveys were carried out in Al Quwy’yia area, located at the centeral part of Saudi Arabia, to map the acquifer and estimate the groundwater potentiality. The acquired vertical electrical sounding (VES) data sets have been collected along three longitudinal profiles trending East-West, perpendicular to the basement/sedimentary contact. The data sets have been analysed using 1D...
January 2012
Modeling flow regime transition in intermittent water supply networks using the interface tracking method
For several ailing water distribution networks in the world, during conditions of excessive withdrawals or insufficient water production, pressures fall to very low or even negligible values and consequently, no water can be supplied. Usually, most pipes have water which either fills or nearly fills their cross sectional areas but the pressure to push it out is absent. With conditions changing from pressurized to no...
January 2012
Assessment of industrial and adaptable building components for a residential layout
From environmental point of view, building waste is a critical issue in present construction. In order to reduce the depletion of valuable materials and natural resources, waste management of constructions needs to be considered in the early stages of design. This requires innovative design strategies that take into account the future demolition and provide flexible and versatile structures. Industrial, flexible and...
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