Comparison of the performance of analog and digital hadronic sampling calorimeters
January 2013
By using the tungsten as passive element and the Glass Resistive Plate Chambers (GRPCs) as active element, the gaseous hadronic calorimeter is studied as a possible detector for the future International Linear Collider (ILC). The results of the numerical study, using the GEANT4 simulation package, of the performance of this calorimeter when it is exposed to a negative pion beam in an energy range from 5 GeV to 100 GeV...
Studies on mass attenuation coefficient, effective atomic number and electron density of some amino acids
January 2013
Mass attenuation coefficient (), effective atomic number () and effective electron density () were determined experimentally and theoretically for some amino acids (Glycine, L-Alanine, D-Alanine, Proline, L-Leucine and D-Leucine) at 8.04, 8.91, 13.37, 14.97, 17.44, 19.63, 22.10, 24.90, 30.82, 32.06, 35.40, 36.39, 37.26, 43.74, 44.48, 50.38, 51.70, 53.16, 80.99, 276.40, 302.85, 356.01, 383.85 and 661.66 keV photon...
Adjust of energy with compactly supported orthogonal wavelet for steganographic algorithms using the scaling function
January 2013
When RGB images are processed for the implementation of steganographic algorithms, it is important to study the quality of the cover and retrieved images, since it typically used digital filters, reaching visibly deformed images. The discrete wavelet transform is useful for adjusting the stego- image quality, because one of their principal qualities which are able to analyze different frequency levels (multi-resolution...
Probing of dielectric properties of high density poly-ethylene/calcium carbonate (HDPE/CaCO3) nano-micro composite
January 2013
In this experimental investigation, high density poly-ethylene/calcium carbonate (HDPE-CaCO3) micro/nano composite sheets were prepared by melt blending the master batch using twin screw extruder followed by injection molding. The dispersion characteristics were determined by field emission scanning electron microscope (FESEM) and were found to be reasonably uniform. These sheets were then subjected to electrical...
Heavy metals in street soil dusts of industrial market in Enugu, South East, Nigeria
January 2013
Analysis of some heavy metals present in soil dusts of Industrial Market in Enugu, South East Nigeria was carried out. Soil dust samples were collected from five different sections in the market and a control sample was collected 500 m away from the market. The samples were analyzed after aqua regia digestion with Flame Atomic Absorption Spectrophotometer for Lead, Iron, Nickel, Copper and Cadmium. The result showed a...
Application of Cyanex® extractant in Cobalt/Nickel separation process by solvent extraction
January 2013
This study presents a detailed review on the advanced hydrometallurgical treatment involving the extraction and separation of Cobalt (Co) and Nickel (Ni) by Cyanex® extractants. The structures, properties and applications of various Cyanex® extractants such as Cyanex®272, Cyanex®301, Cyanex®921, Cyanex®923 and Cyanex®421X were discussed and compared. Cyanex®272 thus proved to be the most...
Simultaneous ultraviolet-visible (UV–VIS) spectrophotometric quantitative determination of Pb, Hg, Cd, As and Ni ions in aqueous solutions using cyanidin as a chromogenic reagent
January 2013
The use of cyanidin (3, 31 41 5, 7 – pentahydroxyflavylium chloride) extracted from a tropical plant Hibiscus sabradiffa L. as a chelating reagent for simultaneous spectrophotometric determinations of ions of Pb, Hg, Cd, As and Ni in mixed aqueous solution is reported. The purified extract of the dried calyces of the Roselle plant was characterized and the results compared with literature...
Measurement of Kβ/Kα x-ray intensity ratios and K to L shell total vacancy transfer probabilities for elements in the range 40 ≤ Z ≤ 50
January 2013
The K shell x-ray intensity ratios Kβ/Kα for 9 elements in the atomic range 40 ≤ Z ≤ 50 have been determined for an excitation energy of 59.537 keV. The K-L total vacancy transfer probabilities (ηKL) for these elements have been determined, also. K x-rays emitted by samples were detected using a high resolution Si(Li) semiconductor detector. The measured...
Fourier transform infrared spectroscopic characterization of clay minerals from rocks of Lalibela churches, Ethiopia
January 2013
This study demonstrates the Fourier transform infrared (FTIR), Raman spectroscopy andscanning electron microscope - energy dispersive X-ray spectrometer (SEM-EDS) techniques which has been applied to characterize decay products and processes occurring at the surface of rock-hewn churches at the UNESCO’s World Heritage site of Lalibela, Northern Ethiopia. Spectroscopic analyses comparing the observed...
The modified (G'/G)-expansion method for the (1+1) Hirota-Ramani and (2+1) breaking soliton equation
January 2013
In this article, we apply the modified (G'/G)-expansion method to construct hyperbolic, trigonometric and rational function solutions of nonlinear evolution equations. This method can be thought of as the generalization of the (G'/G)-expansion method given recently by Wang et al. (2008). To illustrate the validity and advantages of this method, the (1+1)-dimensional Hirota-Ramani equation and the...
Experimental study of the elastic multiple scattering by a two-dimensional (2D) periodic array in the case of empty cavities
January 2013
In this work, we study the propagation of the plane waves in a solid medium (Aluminium) which contains a periodic two-dimensional (2D) array of cylindrical inclusions using a multiple scattering theory. The aim of this study is to validate the experience of certain theoretical predictions such as the frequential positions of the stop-bands and their widths like their evolution according to the geometrical...
On the behavior of the solutions of the system of rational difference equations
January 2013
There has been a great interest in studying difference equations and systems. One of the reasons for this is a necessity for some techniques which can be used in investigating equations arising in mathematical models describing real life situations in population biology, geometry, economics, probability theory, genetics, physics etc. In this paper, we investigate the solutions of the system of rational difference...
Double soliton solutions for some nonlinear partial differential equations (PDEs) in mathematical physics
January 2013
In this article, the extended coupled sub-equations expansion method was used to construct a series of double soliton-like solutions, double triangular function solitons and complexiton solitons for some nonlinear partial differential equations (NLPDEs) via the (2+1)-dimensional breaking soliton equations and the (2+1)-dimensional Nizhnik-Novikov-Vesselov equations. With the help of symbolic computation as...
Digital in-line holography for blood cell
January 2013
This paper investigates the application of Fresnel based numerical algorithms for the reconstruction of Gabor in-line holograms. A simple in-line digital holographic system was used to record blood cell. The Fresnel transformation (FS) method was used for reconstruction of the hologram. High contrast blood cell images were used to demonstrate numerical reconstruction process by Matlab. Sine, cosin, and amplitude...
Mechanical properties of Rowan wood impregnated with various chemical materials
January 2013
The aim of this research was to determine some of the mechanical properties of Rowan wood impregnated with various impregnation materials. For this purpose, the test samples were prepared from Rowan (Sorbus aucuparia Lipsky) wood materials that are of common use in the forest products industry of Turkey according to TS 345. The test samples were treated with Tanalith-E, Vacsol Azure, Imersol-Aqua, and Boron...
Twenty-five years of wind data in south-eastern locations of Nigeria: Modeling and prediction of wind potential
January 2013
Weibull distribution is often invoked to interpret and predict wind characteristics needed for effective design of wind power systems for different locations. In this paper, daily average wind data for Enugu (6.4°N; 7.5°E), Onitsha (6.8°N; 6.1°E) and Owerri (5.5°N; 7.0°E) over a 25-year period is modeled in terms of the Weibull distribution in order to accurately predict wind potentials for the...
Timelike tubes with Darboux frame in Minkowski 3-space
January 2013
In this study, we define a timelike tube around a spacelike curve with timelike binormal by taking Darboux frame instead of Frenet frame in Minkowski 3-space QUOTE . Subsequently, we compute the Gaussian curvature, the mean curvature, and the second Gaussian curvature of timelike tube with Darboux frame and obtained some characterizations for special curves on this timelike tube around a spacelike...
Introducing mole fraction in the density calculations of liquid-liquid solutions
January 2013
The densities of an ideal and a non-ideal liquid-liquid solution were determined experimentally. The experimental results were then compared to calculated values using two mathematical expressions for density, employing partial densities in one and mole fraction in the other. Results were presented in form of tables and graphs, indicating the validity of applying mole fractions in the estimation of liquid-liquid...
Dye-sensitized solar cells (DSSCs) based on poly(3-hexylthioacetate thiophene)
January 2013
This work details the synthesis of a functionalized all-donor polymer, poly(3-hexylthioacetate thiophene) (P3HTT). The spectrophotometry analysis of the polymer showed absorption bands at 450 and 536 nm in the liquid and solid states, respectively with optical band gap ( QUOTE ) of 1.9 eV. In addition, the polymer emits in the green region of the emission spectrum with photoluminescence (PL)...
Synthesis and crystal structure of (Nitrato-O, O')-bis(triphenylphosphine)-silver(I) toluene mono-solvate
January 2013
The reaction of Ag(I) nitrate with triphenylphosphine in methanol in 1:1 molar ratios and recrystallization in toluene resulted in complex of the formula [Ag(PPh3)2NO3]∙C7H8. The compound is a mononuclear neutral complex in which the Ag atom is in a tetrahedral environment consisting of two triphenylphosphine ligands and a nitrate ion acting as a bidentate ligand. The compound crystallizes in the triclinic P`1 space...
Structural, mechanical, optical and second harmonic generation (SHG) studies of gamma glycine single crystal
January 2013
Single crystals of γ-glycine were grown by submerged seed solution method, hanging seed solution growth method and solvent evaporation method. Powder X-ray diffraction (XRD) studies were carried out to confirm the crystalline gamma phase and to find out the lattice parameters of the grown crystals. The presence of various functional groups was determined by Fourier transform infrared (FTIR) spectroscopic analysis....
Removal of 2-Nitrophenol by Linde Type A (LTA) zeolites
January 2013
The adsorption of 2-nitrophenol on zeolites 3A (KA) and 5A (CaA), the general name of which is Linde Type A (LTA), have been investigated by using fourier transform infrared (FT-IR) spectroscopy and scanning electron microscope (SEM) analysis. Nitrophenols can be regarded as both occupational and environmental pollutants. In this work, LTA zeolites which are commercially suitable media for environmental pollutants are...
Evaluation of groundwater potential and aquifer protective capacity assessment at Tutugbua-Olugboyega area, off Ondo road, Akure Southwestern Nigeria
January 2013
A total of thirty-two (32) vertical electrical sounding (VES) data were acquired using R 50 d.c. Resistivity meter within the Precambrian basement geology of part of Akure metropolis southwestern Nigeria. The VES data were interpreted; eight type curves were identified, from the geoelectric section the subsurface was characterized into four lithologies namely topsoil, weathered layer (clay /lateritic clay),...
Study of performance of CeO2/ZnO nanocatalysts for the oxidative coupling of methane using carbon dioxide as oxidant
December 2012
This study shows how CeO2/ZnO nanocatalysts were prepared by combining homogeneous precipitation with micro emulsion using a conventional heating technique. The catalysts were then used in a conventional fixed bed reactor for the oxidative coupling of methane using carbon dioxide as an oxidant. Catalyst performance tests were carried out at atmospheric pressure, feed gas of 33 and 45 ml/min, and reaction temperatures...
Experimental approach to mechanical properties of natural rubber mixing with Calcium carbonate powder
December 2012
Mechanical properties of natural rubber (NR) and calcium carbonate as additive filler with amounts of 5, 10, 15, 20, and 25 parts per hundred (pphr) were studied. The influence of calcium carbonate content on hardness and tensile strength of NR were investigated. The results were obtained from the tests shown. NR hardness and tensile strength was enhanced after adding calcium carbonate powder and...
Landslide investigation study using seismic refraction and 2D electrical resistivity imaging (ERI) technique in Ooty, Nilgiri District, Tamilnadu
December 2012
The aim of this paper is to investigate landslide prone areas in Nilgiri hills which have caused damage to people and properties and to devise preventive steps to be taken in the events of future landslides. Our study area was situated at Ooty region, Nilgiri District, Tamilnadu. In this study we use the seismic refraction survey carried out across landslides located near the villages in Allanchi, Kundha, The...
Estimation of aquifer characteristics using vertical electrical soundings (VES) data from Enugu State University of Science and Technology, Agbani, Nigeria
December 2012
Vertical electrical soundings (VES) were carried out in order to determine the groundwater potential of the Enugu State University of Science and Technology, Agbani, Nigeria. The instrument used was the ABEM Terrameter SAS 300B, employing the Schlumberger electrode configuration. Interpretation of the VES data by partial curve matching technique aided by computer modeling showed that the sampled earth subsurface can be...
Effect of gate electrode work function in conventional and junctionless FinFETs
December 2012
This paper investigates the effect of gate electrode work function in 30 nm gate length conventional and junctionless FinFETs using technology computer-aided design (TCAD)simulations. DC parameters, threshold voltage (vt), drive current (Ion) and output resistance (Ro), and RF parameters, unity gain cut-off frequency (ft), non-quasi static (NQS) delay and input impedance (Z11) are investigated. Junctionless...
Suicide incidents in India in relation with solar activity parameters and cosmic ray intensity (1989 to 2011)
December 2012
We studied the relation between the death due to suicide in India and of various solar activity (SA) parameters, for example, sunspot numbers (SSN), solar flare index (SFI), coronal index (CI) and cosmic ray intensity (CRI), observed during the period of 1989 to 2011. It is seen that the number of suicide incidents of male, female, and average is well correlated with yearly average of SSN, SFI, and CI and positively...
Experimental analysis of hydrophobic characteristics of Silicone rubber (SiR) insulators under different climatic conditions
December 2012
The electrical performance of polymeric insulators depends on the hydrophobicity of their surfaces. In this study, the contact and / or receding angle of a water droplet at the surface of Silicone rubber insulators is measured under different climatic conditions of Egypt. This paper experimentally investigates the effects of various environmental factors (e.g desert’s dust, cement and fertilizer) on the...
Virtual power plant (VPP) and economic dispatch (ED)
December 2012
In this paper, general concept of a virtual power plant (VPP) and its model is developed. In the proposed model for the VPP, power system is divided into smaller subsystems, and it is called the power system cells. Each cell is a small network that has a control center and management system. The concept...
On regression analysis using modified bivariate ranked set sampling design (BVRSS)
December 2012
Research on several forms of ranked set samples had been done by many researchers recently for estimating the population mean and other parameters. The results have ascertained that the ranked set samples are proven to be more efficient than the simple random samples in many situations. In this paper, modified bivariate ranked set sample (MBVRSS) was introduced to estimate a simple linear regression model when the...
Translation surfaces according to Frenet frame in Minkowski 3-space
December 2012
In this paper, using non-planar space curves, the translation surfaces were investigated according to Frenet frames in Minkowski 3-space and some properties of these surfaces were given. Furthermore, we calculated first fundamental form, second fundamental form, Gaussian curvature and mean curvature of the translation surface. Also, the Darboux frame of the generator curves of the translation surfaces in Minkowski...
An efficient numerical integration algorithm for single-layer Raster cellular neural networks simulator
December 2012
An efficient numerical integration algorithm for single layer Raster cellular neural networks(CNN) simulator is presented in this paper. The simulator is capable of performing CNN simulations for any size of input image, thus a powerful tool for researchers investigating potential applications of CNN. This paper reports an efficient algorithm exploiting the latency properties of CNN along with numerical...
Effects of different impregnation chemicals on combustion characteristics and decay resistance of wood
December 2012
This study was aimed to determine combustion characteristics and decay resistance of Spruce [Picea orientalis (L.)], Fir (Abies nordmanniana), Alder [Alnus glutinosa (L.)], and Iroko (Milicia excelsa) woods impregnated with ammonium tetrafluoro borate (1 to 3%) and the mixture of cement and borax (6% to 9%). The combustion test method was performed in three stages: flame stage, without...
Dielectric properties of spray pyrolized Aluminum doped Cadmium sulfide (Al-doped CdS) thin films
December 2012
Spray pyrolysis has been applied to deposit of Cadmium sulfide (CdS) and Aluminium doped Cadmium sulfide (Al-doped CdS) thin films. These films were used in various devices such as solar cells, sensors, and solid oxide fuel cells. Optical and dielectric properties such as transmittance (T%), absorption coefficient (α), real dielectric constant (), imaginary dielectric constant (), and dielectric loss (δ)...
Numeric and experimental survey of a condenser to porous media of granite
November 2012
This article evaluates the numeric and experimental survey of a distiller's condenser for brackish water whose saltiness varies between 5 to 10 g/L. The condenser is a cylindrical tank, in which is vertically arranged and the pieces of granite constituent of porous media. The governing equations that describe the transfers are deduced from a thermal and mass global balance within the condenser. Finite difference...
Alternating current (AC) electroosmotic flow of generalized Maxwell fluids through a circular microtube
November 2012
An analytical solution for the time periodic electroosmotic flow (EOF) of the generalized Maxwell model through a circular microtube is presented by solving the linearized Poisson-Boltzmann equation, together with Cauchy momentum equation and General Maxwell constitutive equation. By numerical calculations, we find that for lower Ω and smaller De, classical plug-like profile of Newtonian fluids is reduced. At...
Transient magnetohydrodynamic (MHD) flow of a visco-elastic fluid past an infinite vertical porous plate embedded in a porous medium with Hall current and slip condition in a rotating system
November 2012
An attempt is made to present a theoretical analysis of a transient magnetohydrodynamic (MHD) flow of a visco-elastic fluid (Walter’s B’) past an infinite vertical porous plate embedded in a porous medium with constant permeability in a rotating system in the presence of Hall current when the plate temperature varies periodically with time. The expressions for the non-dimensional velocity field, temperature...
The Dirac equation with position-dependent mass for the modified Pöschl-Teller potential and its solution
November 2012
The Dirac-modified Pöschl-Teller problem with position dependent mass is investigated within the framework of the asymptotic iteration method in N dimensions. Any -state solutions are obtained by using the exponential approximation for the centrifugal term. The energy eigenvalues and two-component spinor corresponding eigenfunctions are determined for different screening...
Modeling and simulation of UPFC using PSCAD/EMTDC
November 2012
This paper proposes to model and simulate a unified power flow controller (UPFC) in power system computer aided design and electromagnetic transient direct current (PSCAD/EMTDC) environment. The series converter of the UPFC controls the transmission line real/reactive power flow and the shunt converter of the UPFC controls the UPFC bus voltage/shunt reactive power and the DC link capacitor voltage. The real power demand...
Teachers’ views about the application of secondary Physics course curriculum
November 2012
The main purpose of this study is to investigate teachers’ views about the application of secondary Physics curriculum (9, 10, and 11 grade) whose application had been started from 2008 to 2009 academic years and gradually extended to other grades. The study is a descriptive survey for determining the situation. In the study, a scanning model has been used. Sample of the study consists of 82 Physics teachers who...
Exact and explicit solutions for the discrete Burgers equation by means of the Exp-function method
November 2012
In recent years, various direct methods were proposed to find exact solutions not only for nonlinear partial differential equations but also for nonlinear differential-difference equations (NDDEs). In this paper, the Exp-function method was extended to the discrete Burgers equation for searching traveling waves in closed forms. It was shown that the equation supported discrete solitary wave solutions. Our results,...
The effect of mineral admixtures and micronized calcite on alkali silica reaction expansions in the usage of aggregates from different origin
November 2012
This paper investigates the effectiveness of two zeolites with different reactive silica content, fly ash (FA), blast furnace slag (BFC), silica fume (SF), and micronized calcite (MC) in reducing expansion of concrete due to alkali-silica reaction. Also in this research, effects of three different cement usages were investigated by using accelerated mortar bar method, ASTM C1260. Five different aggregates, three natural...
Coastal geoid improvement using airborne gravimetric data in the United Arab Emirates
November 2012
Military survey department (MSD) of The United Arab Emirates (UAE) has undertaken the Airborne Gravity Survey Project for the marine area of the country. The main purpose for the implementation of the airborne gravity survey for the marine area is to improve the existing gravimetric geoid of the UAE. The airborne gravity data was estimated to have accuracy better than 2.0 mGal. The first gravimetric geoid for the...
The algorithm of Fuzzy C-Means clustering based on non-negative matrix factorization
November 2012
Clustering analysis is an effective method to discover and identify tumor classes. So, this paper proposes a Fuzzy C-Means clustering (FCM) algorithm based on Non-negative matrix factorization (NMF). Firstly, gene expression profiling (GEP) is simply processed through mean and variance of gene expression, which can then be mapped into a low dimensional space by NMF method. Finally, for discovering and identifying cancer...
On-line drill wear monitoring in high speed machining of jute fiber-reinforced composites using virtual instrumentation
November 2012
Many challenges in machining need to be overcome in replacing fiber reinforced composites. In this work, jute fiber reinforced bioepoxy resin laminates were manufactured, drilled and inspected. The drilling operations were performed on jute fiber reinforced composites by high speed steel (HSS) drill bits. Drill wear state prediction allows the determination of the hole quality as well as tool replacement...
Application of response surface methodology for electrochemical destruction of cyanide
November 2012
This study investigated the influence of experimental factors on the electrochemical cyanide destruction efficiency in a flow-through reactor using response surface methodology. Central composite experimental design was used to obtain the four main operating factors, such as current density, initial cyanide concentration, chloride concentration, and electrolysis time, on the response surface of cyanide destruction...
Development of the sugarcane harvester using a small engine in Northeast Thailand
November 2012
This research presents the developing sugarcane harvester using small engine in order to focus on its appropriateness in sugarcane farming for farmers who are encountering problems of labor shortage and sugar factories lacking sugar cane for producing sugar. It is operated by 180 hp (134.28 kW) at 2500 rpm. Sugarcane was harvested at 12 months after planting with an average-stalk length of 1.8 m, and average-stalk...
Some oscillating motions of a Burgers' fluid
November 2012
In this work, the exact analytic solutions for some unsteady oscillating flows of an incompressible Burgers' fluid in a duct of rectangular cross-section are considered. Here, two types of flows, namely, (1) flow due to the oscillating pressure gradient, and (2) flow due to the oscillation of duct parallel to its length, were considered. The exact analytical expressions for the velocity field and the adequate shear...
Page 12 of 52, showing 50 records out of 2556 total, starting on record 551, ending on 600
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