Some new classes of analytic functions defined using convolution
September 2011
In this paper, we introduce and study some new subclasses of analytic functions defined in the open unit disc using the convolution technique. Inclusion results, radius problems and several other properties of these classes are discussed. Key words: Convolution integral operator, functions with positive real part, alpha-starlike, bounded Mocanu variation, univalent.
Behavior and performance of a photovoltaic generator in real time
September 2011
Solar photovoltaic is of great importance for developing countries like Mauritania and Senegal, without which many villages in these countries would still be facing lack of electricity services for many years to come. The use of solar energy can contribute to the improvement of the living conditions of these populations. This work presents the development of a simulation model for predicting the performance of a solar...
A metamaterials inspired miniaturized phi-shaped antenna
September 2011
This paper introduces a new low cost, robust miniaturized microstrip antenna inspired with metamaterial split ring resonator structure (SRR). Because of metamaterials property there has been considerable reduction in size. The overall antenna structure is phi shaped which is equivalent to two SRRs placed back to back. This phi shaped antenna (PSA) thus obtained has been simulated on EM solver Ansoft HFSS and scattering...
Design of new square-lattice photonic crystal fibers for optical communication applications
September 2011
In this paper, two new square-lattice photonic crystal fibers (PCFs) are designed and proposed. Both fibers have identical structures with five air-hole rings, yet the diameter of air-holes differ in their structures. Finite-difference time-domain (FDTD) method with the perfectly matched layers (PML) boundary conditions has been used to investigate these fibers. The proposed photonic crystal fibers exhibit properties of...
Signature verification using rules 3-ext inductive learning system
September 2011
This paper presents an alternative technique for “signature verification”. The technique employs template matching for feature extraction and Rules 3-ext inductive learning algorithm to extract the necessary set of rules and to verify a signature. 15 of 3 × 3 masks were used to represent a signature. Each signature (or pattern) is presented by the frequencies of the masks used. The system was trained...
Influence of tensile force of agave and tea plants roots on experimental prototype slopes
September 2011
The study is aimed to determine the influence of tensile force of roots of agave (Angustifolio marginata) and tea (Acalypha siamensis) plants on landslide in prototype slopes. The plants of agave and tea were planted in different prototype slopes and the corresponding tensile forces were measured with the installed strain gauge in-situ. The study found that the tensile force of tea plants increase with...
A constrained equalization scheme for mobile location in non-line-of-sight environments
September 2011
Mobile location techniques in wireless communication networks have received significant attention in recent years. One of the main problems impeding accurate location estimation is non-line-of-sight (NLOS) propagation. In this paper, we propose a novel method by incorporating constrained optimization algorithm with an equalization scheme, where the weights are derived from root mean square delay spread, which is an...
Analysis of transient heating due to exothermic reaction in a stockpile of combustible material
September 2011
In this paper, the transient heating in a stockpile of combustible material due to an exothermic reaction in the presence of convective heat loss to the ambient is analyzed. The transient heating in a slab due to an exothermic chemical reaction with the possibility of heat loss to the ambient is considered. The chemistry involved in the problem is simplified by assuming a one-step finite-rate irreversible Arrhenius...
Strength development of mortar and concrete containing fly ash: A review
September 2011
Among the construction materials; concrete, steel, timber and glass, concrete has gained popularity all over the world due to its durable properties in normal environment and easiest construction procedure. Compare to others constituent, cement performs a vital role for the production of concrete. Due to continuous increasing demand and the cost of cement, recently, the utilization of supplementary cementing materials...
Compensation effect of implementation of filters in use of unsuitable collimator in SPECT images
September 2011
Use of digital filters to improve the visual quality of SPECT images is a well-established technique. The goal of the filtering is to compensate for loss of detail in an image while reducing noise and improving of image quality. In this paper we studied the results of SPECT one and two line sources (contained with Tc-99 m) images obtained by SPECT equipped with unsuitable collimators (Low Energy General Purpose (LEGP)...
Local magnitude calibration of Kuwait national seismic network
September 2011
A magnitude formula is preliminarily developed from Kuwait national seismic network (KNSN) data which is proposed and intended for application by the network in its seismic monitoring activities. This is an adapted local magnitude scale of measurement, which is empirically determined and expressed as: ML = log (A) + 1.43 log (Δ) + 1.0 + Di. The magnitude formula is as a result of applying multiple regression...
The accuracy of the absolute NAA method based on the analysis of standard reference materials (SRMs)
September 2011
The aim of this study was to demonstrate and validate the use of the absolute NAA method, inside the Malaysian nuclear agency (MNA) research reactor, by analyzing the IAEA SRMs; soil-1 and soil-7. The analytical results showed that the deviations between experimental and certified values were mostly less than 10% with Z-score ranging from 0 to 2, and only for few element it exceeds 20%. In general, the results for...
Growth of nanostructured CdO by solid-vapor deposition
September 2011
Cadmium oxide (CdO) nanostructure was synthesized by solid-vapor deposition. Cadmium powder was heated to 1274 K in a tube furnace, and the resultant vapor was carried to the silicon substrate zone by an argon flow with a trace amount of oxygen. Field emission scanning electron microscopy revealed that the product was grass-like of Cadmium oxide nanostructure. X-ray diffraction and energy dispersive X-ray techniques...
Gas waste, local or global problem
September 2011
Production of bricks is one of the most spreaded industries worldwide. At the same time, it is one of the large energy power consumers, where the energy has a large share in the price of product. It is natural that more efficient exploitation of energy has an impact on decrease in cost price making the final product more competitive. An attempt to exploit waste heat energy of smoke emitting gases led to significant...
Development of a hovercraft prototype with an aluminium hull base
September 2011
A study was undertaken to construct an economical and robust hovercraft by using the aluminium Al 6061-T6 (marine). In this study, the stability and ultimate strength of the aluminium Al 6061-T6 was tested to find its stands as the material for the hovercraft hull base development. Structural analysis by using NASTRAN/PATRAN software was carried out to see the suitability and the reliability of the alloy. The...
Proximal algorithms for solving mixed bifunction variational inequalities
September 2011
In this paper, we suggest and analyze some proximal methods for solving mixed bifunction variational inequalities using the auxiliary principle technique. Convergence of these methods is considered under some mild suitable conditions on the bifunction and the operators. Several cases are also discussed. Results in this paper include some new and known results as special cases. Key...
On topological covering-based rough spaces
September 2011
Rough set theory, a mathematical tool to deal with vague concepts, has originally described the indiscernibility of elements by equivalence relations. Covering-based rough sets are a natural extension of classical rough sets by relaxing the partitions arising from equivalence relations to coverings. Recently, some topological concepts such as subbase, neighborhood and separation axioms have been applied to study...
Quartic spline method for solving second-order boundary value problems
September 2011
In this paper, uniform quartic spline polynomial functions are used to develop some consistency relations which are then used to derive a numerical method for approximating the solution and its first, second, third and fourth derivatives of second order boundary value problems. The present method is capable of producing fourth order accurate approximations for the solution, as well as its first and second derivatives,...
Analytical solutions for heat transfer flows of a third grade fluid in case of posttreatment of wire coating
September 2011
The steady flow of a third grade fluid which belongs to non-Newtonian fluid mechanics deserves more attention than it has been to date, because in the nonlinear systems, the literature is scarce. In this paper, we develop a formulation suitable for solution in the case of posttreatment of wire coating containing thermal effects of third grade fluids. The optimal homotopy asymptotic method (OHAM) and regular perturbation...
Ontology mapping using bipartite graph
September 2011
Fast improvement of web technologies have caused a problem of semantic integration between distributed applications. In this respect, sharing and distribution of information are of vital importance for ontologies. Ontologies may be improved by any independent association and still be used by another association. In case an association decides to use an ontology improved by another association, they should make mapping...
Cross-layer based security solutions for wireless sensor networks
September 2011
Wireless sensor networks (WSNs) were often used to collect sensitive data and the entire network was particularly vulnerable to various threats at different layers of the protocol stack. With this in mind, there was need to improve security solutions that were inevitable and advantageous to the successful deployment of the wireless sensor networks. The vast research conducted to provide security solutions against...
Artificial bee colony search algorithm for examination timetabling problems
September 2011
Artificial bee colony is a population-based search algorithm that mimics a natural behavior of real honey bees to find rich food sources to obtain maximum quantity of nectar and share the information of food sources with other bees in the hive. This paper concerns primarily about how to use artificial bee colony to solve examination timetabling problems which it is known as a NP-hard problem. It deals with assigning...
Security constrained economic dispatch using multi-thread parallel computing
September 2011
This paper presents the development of an efficient security constrained economic dispatch using multi-thread parallel computations. One of the main obstacles in wide application of economic dispatch is the slowness of algorithm execution time, especially when a large system is utilized. Aside from the model development to overcome this, we have proposed a technique to perform parallel computing of the problem which can...
Design of airport enclosures remote laser intrusion detection and alarm system
September 2011
An airport enclosures intrusion detection system was proposed. Laser was used as detection means of alarm information in the system, intrusion event and region were detected through various means such as laser signal processing, visual information, information fusion and decision, etc., the alarm will be send to monitor center in time through CAN (Controller-area network) bus network and ethernet. The system has the...
Satellite Image Encryption for C4I System
September 2011
Global command and control system (GCCS-Joint) is a command, control, communications, computers and intelligence (C4I) system which consists of hardware, software, procedures and standards and which provides directory services, enterprise services and security services by exchanging imagery, intelligence, status of forces and planning information. In order to secure this exchange of imagery and information, we need more...
Effect of non sway and sway methods for analysis and design of reinforced concrete frames for multi-storey building
September 2011
This paper investigates the numerical modelling analysis and design of non-sway and sway method for multi-storey reinforced concrete frames. Multi-storey buildings having a height of 57.7 and 23.5 m consisting of 15 storeys' and 6 storeys, respectively have been analysed for non-sway and sway condition by using software STAAD. Pro V8i. Column sizes have been changed in every three storeys interval and beam sizes...
Controlling crystallization and morphologies of monoclinic bismuth vanadate (BiVO4) dendrite with enhanced photocatalytic activities
September 2011
The monoclinic BiVO4 dendrites constructed by Bismuth vanadate (BiVO4) branches with average diameters of about 100 nm have been successfully fabricated by Sodium dodecyl sulfate (SDS) assistant hydrothermal process. The monoclinic BiVO4 dendrites were characterized by X-ray diffraction, scanning electron microscopy, Raman spectroscopy and transmission electron microscopy. The monoclinic...
Bridge architecture in Japan
September 2011
A bridge is a structure built to span physical obstacle such as a body of water, city, or road, for the purpose of providing passage over the obstacle. Bridges are a unique offshoot of architecture and possess their own associated terms, components and styles. This paper presents the second part of Japanese bridges by investigating architectural aspects of its design. Limited usable land in heavily populated areas of...
Improvement of granular soils by low pressure grouting
September 2011
Permeation grouting is a deep-soil improvement technique in which grout is injected into the voids, fissures and cavities in a soil formation in order to improve resistance to liquefaction, strength and durability and to reduce its permeability and deformability. The objective of this research is to investigate the parameters that affect the strength of cement grouted granular soils through laboratory testing. With this...
A review of audio based steganography and digital watermarking
August 2011
With the increasing usage of digital multimedia, the protection of intellectual property rights problem has become a very important issue. Everyday, thousands of multimedia files are being uploaded and downloaded. Therefore, multimedia copyrights become an important issue to protect the intellectual property for the authors of these files. In this paper, the domains of digital audio steganography, the properties of...
A distributed transmission line model of cloud-to-ground lightning return stroke: Model verification, return stroke velocity, unmeasured currents and radiated fields
August 2011
Among the various models for lightning return strokes (LRS) that exist, the lossy distributed transmission line (DLCR) model, it is shown herein, is a dependable, comprehensive and accurate model. The model contains inductance (L), capacitance (C), and the heat-loss resistance (R). Recently, many alternative models have been proposed, and the adequacy of the DLCR model (DLCRM) has been questioned because of some...
Wave propagation in a piecewise homegenous cantilever beam under impact force
August 2011
This paper focuses on responses of the free end of a cantilever beam made of two different materials under the effect of an impact force. The beam is excited by a transverse triangular force impulse modulated by a harmonic motion. The Kelvin–Voigt model for the material of the beam is used. The considered problem is investigated within the Euler-Bernoulli beam theory by using energy based finite element method....
Growth and characterization of glycine sodium nitrate (GSN) single crystal
August 2011
Good optical quality single crystals of glycine sodium nitrate (GSN) were grown by slow evaporation technique from its aqueous solution at room temperature. Single crystal X-ray diffraction (XRD) studies revealed the presence of monoclinic structure with space group Cc, and Fourier transform infrared transmission (FTIR) has confirmed the presence of the functional groups present in the single crystal system. The thermal...
Diversity technique for multiple input multiple output orthogonal frequency division multiplexing (MIMO-OFDM) system using a new subcarrier mapping scheme
August 2011
The objective of this research is to propose a new subcarrier mapping scheme intercarrier interference self cancellation intercarrier interference self cancellation (ICI-SC) technique using data allocation in space time frequency block codes (STFBC) multiple input multiple output orthogonal frequency division multiplexing (MIMO-OFDM) system. It aims to achieve maximum diversity order and to compensate integrated effect...
Determination of the steady state response of portal frames with intermediate viscoelastic links
August 2011
Steady state response of portal frames whose members are connected to each other continuously or by infinitesimally small rotational link elements (intermediate viscoelastic hinges) are investigated under a periodic external force within the Euler-Bernoulli beam theory by using energy based finite element method. The effect of damping of the members of portal frames, the values of rotational spring coefficient and...
The flow of a Carreau fluid down an incline with a free surface
August 2011
This paper deals with the effect of a Carreau fluid flow down an inclined plane with a free surface. The fluid film is thin, so that lubrication approximation may be applied. In general, the flow equations resulting from the variable viscosity model must be solved numerically. However, when the viscosity variation is small, then an asymptotic approximation is possible. The full solutions for the velocity and temperature...
Computational study of hydrogen bonding on calix[8]arene as nanostructure compound
August 2011
The study of organic structure to form nanoporous structures is well known in chemistry phenomena to finding crystal structure of calix[8]arene as supra molecular chemistry. The effect of hydrogen bonding on calix[8]arene was reported at Hartree Fock by Gaussian 98 program package. The self assembled nanotubes in solid state through network hydrogen bonds between the chains of this structure were...
NMR shielding tensors and thermodynamic investigation of B10N11 nanocone structures
August 2011
Density functional theory (DFT) and HF are carried out at B3LYP/3-21G/6-31G/6-31G*/6-311G* level of theory to investigate the stability and ground state of B10N11 nanocone. In present work, NMR shielding parameters were calculated based on each atom to study the active sites in this system. In thermochemistry part of study, it was found that the best molecular orbital description for this molecule is 6-311G* level...
Earthquake time history for Dhaka, Bangladesh as competent seismic record
August 2011
The time varying forces in the ground generates earthquake loads and the pattern of load specified as a time history of ground excitation is the most accurate means of representing earthquake actions. The difficulty with carrying out analysis procedures to compute the responses of a structure for this type of load is that the form of the acceleration time history is to be clearly known. As there is lack of...
Determination of concrete compressive strength of the structures in Istanbul and Izmit Cities (Turkey) by combination of destructive and non-destructive methods
August 2011
Cylindrical concrete cores of 10 cm diameter and height were taken from the columns and shear walls of randomly chosen 5-40 years old reinforced concrete (RC) buildings located in different towns of Istanbul and Izmit (Kocaeli) in Turkey from 2000 to date. The ultrasonic pulse velocity (UPV) measurements and uniaxial compressive strength (UCS) tests were conducted on 200 concrete core specimens in our laboratory. The...
Object recognitions in RADARSAT-1 SAR data using fuzzy classification
August 2011
This study is aimed to utilize fuzzy classification for different object detections that is urban, infrastructure and coastal water in RADARSAT-1 SAR S2 mode data. Prior to fuzzy classification, Lee algorithm with kernel window sizes of 7 × 7 pixels and lines is implemented to S2 mode data. Indeed, speckle reduction is performed using Lee algorithm. The results show that Lee algorithm is able to provide excellent...
Uplift response of square anchor plates in dense sand
August 2011
The behavior of square anchor plates during vertical pullout was studied by experimental data and finite element analyses in dense sand. Validation of the analysis model was also carried out with 100 mm x 100 m square plates in dense sand. Agreement between the uplift capacities from the experimental tests and finite element modeling using PLAXIS 2D, based on 0.2 m computed maximum displacements was excellent for square...
Three dimensional reconstruction of coastal bathymetry using TOPSAR c-band
August 2011
This paper reports on a study carried out for the generation of three-dimensional (3D) ocean bathymetry using airborne TOPSAR data. The main objective of this study is to utilize fuzzy arithmetic for constructing ocean bathymetry from polarized remote sensing data such as a TOPSAR image. In doing so, two three-dimensional surface models, the Volterra model and a fuzzy B-spline model which construct a global topological...
Numerical analysis of the load bearing capacity of pin-ended hybrid headed columns under uniaxial loading
August 2011
The behaviour of fully encased composite columns loaded in axial compression through the concrete core and whole cross-section was studied. The primary objective is to develop a complete non-linear finite element model that could represent the behaviour of fully encased composite columns tested under uniaxial compression in the laboratory. A total of 10 models were analyzed using finite element simulations and the...
Investigating the effectiveness of aquatic plants (Echinocloa L and Cyperus L) in removing nutrients from wastewater: The case of Chemelil constructed wetland- Kenya
August 2011
This study focused on the effectiveness of wetland plants: Echinocloa pyramidalis (L) andCyperus papyrus (L) in purifying wastewater from sugar factory stabilization pond effluent. This study was performed in a pilot-scale Free Water Surface Constructed Wetland (FWSCW) system in Chemelil sugar factory, Kenya. Four of the eight constructed wetlands (CWs) were planted with C. papyrus and the other half...
Elevation of spatio-temporal variation of recent and future evapotranspiration trends in arid areas of Iran (Case study: Yazd)
August 2011
The present research has been conducted aiming at simulation of the effect of climate changes on evaporation in Yazd. This research considers both the changes of the trend of the observational meteorological data in the past decades and the changes of the future decades. In evaluation of the evaporation data of the Yazd in the past decades, the statistical period of 1953 to 2009 has been considered. In the next...
Electrical and optical properties of nanostructured copper (I) iodide (CuI) incorporated with ligand agent for dye sensitized solar cell applications (DSSC)
August 2011
Dispersion of CuI solution incorporated with ligand or stabilizer in acetonitrile solvent has been deposited on glass substrates, where it formed a mixture of inorganic/organic thin film in order to study its characteristics for dye sensitized solar cell applications (DSSC). CuI thin film has been prepared by sol-gel process with incorporation of TMED as a ligand into the CuI solution. Particle size of the solution is...
Prediction of a diesel engine characteristics by using different modelling techniques
August 2011
In this study, the characteristics of a four-stroke internal combustion diesel engine have been investigated by means of artificial neural networks (ANNs) and adaptive neuro-fuzzy inference system (ANFIS) modelling techniques, using injection pressure, engine speed and torque. Injection pressure of diesel engine has been designed with a pressure of 150 bars for the turbo charger and pre-combustion chamber. The...
Impact of distributed generations on power system protection performance
August 2011
Though distributed generators (DGs) have significant economic and environmental benefits, increased penetration of DGs will impose significant technical barriers for the efficient and effective operation of bulk power systems. Increased fault current contribution and load flow changes are the major two impacts on utility systems, and these will affect existing protective relaying, especially overcurrent relays. To...
Optimization of harmonics formed in asynchronous motors through SPWM and genetic algorithms
August 2011
This study on the elimination of harmonics which form in three-phase asynchronous motors driven by inverters uses genetic algorithms (GA), one of the optimization methods, to suppress the undesired harmonics. By the use of Matlab/Simulink program, the study aims to identify the optimum switching angles in the optimum number. Optimum switching angles are the angles which make the first harmonic amplitude the biggest and...
Page 31 of 52, showing 50 records out of 2572 total, starting on record 1501, ending on 1550
Advertisement
Advertisement
