The electrostatic potential at the center of associative magic squares
January 2012
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...
Harmonic suppression of microstrip ring resonator using double spurlines
January 2012
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...
Companies’ performance in stock exchanges: Using sequential patterns-algorithm
January 2012
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...
Lanthanide complexes of {(5-phenyl-1,3,4-oxadiazol-2-yl)thio}acetic acid: Synthesis, characterization and preliminary in vitro antibacterial screening activity
January 2012
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...
Toxicity evaluation for low concentration of chlorophenols under solar radiation using zinc oxide (ZnO) nanoparticles
January 2012
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...
Molecular dynamics simulation of sodium dodecyl sulfate in the presence of bovine carbonic anhydrase: Behavior of water
January 2012
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...
Removal of Pb(II) from aqueous solution using hydrotalcite-like nanostructured material
January 2012
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...
Full non-rigid group theory and symmetry of some diborane derivatives
January 2012
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...
New variational iteration decomposition method for solving twelfth order boundary value problems
January 2012
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...
A new technique for systems of Abel-Volterra integral equations
January 2012
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...
Timelike-spacelike Mannheım partner curves in IR31
January 2012
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,...
Integrating anchored instructional strategy and modularity concept into Interactive multimedia PowerPoint presentation
January 2012
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...
Text clustering on latent semantic indexing with particle swarm optimization (PSO) algorithm
January 2012
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...
Using mobile geographic information system (GIS) techniques to develop a location-based tour guiding system based on user evaluations
January 2012
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...
Investigation of electrical treeing in cable grade crosslinked polyethylene (XLPE) insulations
January 2012
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...
Evaluation of corrosion inhibiting admixtures for steel reinforcement in concrete
January 2012
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,...
Nitrate in drinking water: A major polluting component of groundwater in gulf region aquifers, south of Togo
January 2012
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...
Examining the sensibilities of the different sectors active in Düzce concerning clean production
January 2012
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...
Sealer and coating systems for the protection of concrete bridge structures
December 2011
Concrete bridge structures most often experience different forms of deterioration, such as surface scaling, spalling, and internal frost damage due to environmental and chemical attacks. Sealers and coatings are used to reduce these forms of concrete deterioration by limiting penetration of water and water-borne deleterious agents, such as chlorides and sulphates. Moreover, sealers and coatings are used to...
Auto-Bäcklund transformation and singular solutions for the generalized coupled Camassa-Holm equation
December 2011
Auto-Bäcklund transformation and Weiss-Tabor-Carnevale (WTC)-kruskal algorithm are applied for the coupled Camassa-Holm equation in this paper. Four regular solitons including blow-up waves and compactons are given by the ansatz method. Then, an auto-Bäcklund transformation of the coupled equation is obtained. Thus, we observe that based on the solitons we get before, some singular...
Changes in local B-value prior to moderate local earthquakes: Gulf of Aqabah, northern red sea
December 2011
During the last fifteen years, the Gulf of Aqabah has been considered as one of the most seismically active zones in the Middle East region. A catalogue of 1415 events were compiled using the available data from the Seismic Studies Center Network, King Saud University and the adjacent neighboring networks. The data cover the time span that started from 1985 to 1995 and an area located between latitudes 28 to...
Glass-forming tendency in the K2O-BaO-B2O3-Al2O3-TiO2 system
December 2011
Vitrification in the system of K2O-BaO-B2O3-Al2O3-TiO2 containing (mol%): K2O (0 to 28), BaO (0 to 28), B2O3 (5 to 24), Al2O3 (7 to 25) and TiO2 (33 to 60) was investigated by fusion at 1450°C for 2 h. The fields of vitrification were analyzed with different forms of diagrams. It is shown that stable glasses can be produced with batchs containing 62 to 75 mol% of glass-formers...
Asphaltic concrete facing for rockfill dams in arid and semi-arid countries: A case study of Alsourani Dam, Syria
December 2011
Asphaltic concrete lining for dams and storage reservoirs are today classified as state of the art technology. Storage reservoirs and dams are sealed with asphaltic concrete –world-wide. However, certain prerequisites are absolutely necessary for the successful use of this sealing method. First, there must be careful selection and suitability testing of the construction materials and then the subsequent...
Stability of DNA binding with dipyrandium: A theoretical study
December 2011
Recent analysis on structure and dynamics of nucleic acid suggest that the DNA helix undergoes conformational transition as function of salt and solvent. This flexibility leads folding of DNA either smoothly or its chain direction changes abruptly by the generation of kinks. The steroid diamine binds to DNA through the minor groove at the kink site and stabilized the complex. In the present study, we reported...
Quality factor, static and dynamic responses of miniature galfenol actuator at wide range of temperature
December 2011
In this research, galfenol (iron-gallium alloy) is exploited to make a miniature actuator. The relationship between displacement and the applied current is measured. Furthermore, the dynamic behaviors of the actuator in wide range of temperature from cryogenic environment (77 K) to room temperature (RT) are investigated numerically and experimentally. Although, the length of galfenol bar is 10 mm and the...
An enhanced embedding method using inter-sentence, inter-word, end-of-line and inter-paragraph spacing
December 2011
This paper discusses a novel embedding mechanism which uses hybrid methods of inter-sentence, inter-word, end-of-line and inter-paragraph spacing to embed the secret message. From the test cases analysis, the proposed system has proven that it is able to hide larger capacity compared to other current steganographic tools such as wbStego4open, SNOW and Spacemimic. From the experimental results, the proposed...
Linear probability based admission control policy for video on demand system
December 2011
In this paper, we propose a dynamic admission control policy for distributed video on demand system, based on linear probability function. The probability of accepting a video request is calculated by using a liner mathematical formula. Quality of service (QoS) is granted by restricting the requests on the basis of popularity of request and availability of resources. The popular video request will get better...
Synchronous Nyquist folding receiver using dual harmonics local oscillator signals
December 2011
A synchronous Nyquist folding receiver (SNYFR) could intercept wideband signals in multi-Nyquist zones with two analog-to-digital converters. The instantaneous Nyquist zone (INZ) of the SNYFR may not exist or is not unique, and the dual local harmonics was presented to improve the stability of the SNYFR. It was found that the existence and unique conditions of the INZ determined that the frequency of the...
Self-decision route selection for energy balancing in wireless sensor networks
December 2011
In many wireless sensor network (WSN) applications, data from the monitored environmental phenomenon only need to be sampled intermittently and transmitted to the base station. Hence, an intelligent protocol that balances the traffic load among the nodes and minimizes their energy usage, especially during routing and idle listening, which is necessary to extend the network lifetime. In this paper, a load...
Thermographic analysis of Wi-Fi frequencies exposed to unrestrained Swiss albino mice
December 2011
Effects of electromagnetic field exposure due to Wi-Fi frequency were presented. A total of 72 unrestrained Swiss albino mice were used as surrogate and were divided into two groups of sham exposed and 2.46 GHz exposure group. The exposure duration was for 7 h/day, 7days/week for 4 consecutive weeks. Thermographic pictures of both groups were taken to obtain the body temperature of the mice before and after...
Mannheim partner curves in 3-dimensional Heisenberg group
December 2011
In this study, we give some basic theorems for Mannheim partner curves in three dimensional Heisenberg group. We also found the relations between the curvatures and torsions of these associated curves. Key words: Heisenberg group, Mannheim curve.
Effects of promoters on methane dry reforming over Ni catalyst on a mixed (a-Al2O3+TiO2-P25) support
December 2011
Carbon dioxide reforming of methane to synthesis gas over Ni on a mixed (α-Al2O3 and TiO2-P25) support was investigated. The effect of adding Zr and Ce promoters to the supported catalyst was studied. Catalytic testes were performed at atmospheric pressure, flow rate of 33 ml/min and various reaction temperatures in the range of 500 and 800°C. The influence of several operating conditions such...
Proximate chemical analysis of nutritive contents of Jujube (Ziziphus mauritiana) seeds
December 2011
This study provided estimate of nutrient content of Ziziphus mauritiana, a lesser known tropical legume plant. Chemical analysis of the seeds collected from Bojude in Kwami local government area in Gombe State and Hanani in Bauchi local government area, Bauchi State in Nigeria, showed that, the crude protein, moisture, ash, crude fibre, lipids and carbohydrates were 36.10 ± 57, 4.21 ±...
NMR and natural bond orbital (NBO) calculation of glyoxals: Nano physical parameter investigation
December 2011
Preliminary investigation of tensile properties of welded type I collagen to be used as surgical sealant
December 2011
Type I collagen has been identified as the most abundant protein in the human body, and it has been used extensively in the healthcare industry as a biomaterial for the purposes of soft tissue repair, tissue engineering and many other areas. The aim of this study was to research the mechanical tensile strength of type I collagen when welded together for possible use as a sealant biomaterial for surgical...
Study on the frequency – amplitude relation of beam vibration
December 2011
New analytical work on the well-known preload nonlinearity using the innovative equivalent function (EF) is presented in this paper. The nonlinear vibration of cantilever beam with nonlinear boundary condition in the presence of preload spring with cubic nonlinearity is studied. The powerful analytical method, called He’s Parameter Expanding Method (HPEM) is used to obtain the exact solution of dynamic...
A new finite element investigation on pre-bent steel strips as damper for vibration control
December 2011
In this study, a new type of seismic energy-dissipative device in the form of braces based on pre-bent strips has been utilized. In this approach, moment-resistance frame systems have been used for 3, 5, 7, 9, 11 and 12 stories and various models. The height of stories and all span lengths are 3 m. In order to compare the response of models, braced (with damper) and unbraced (without damper) have been...
Oscillatory channel flow for non-Newtonian fluid
December 2011
This paper deals with an analytical solution of oscillatory flow of an incompressible second grade fluid in a channel. The flow in the channel is driven by suction at the permeable walls, whereas small amplitude time harmonic pressure waves are responsible for oscillations in the velocity field. The time independent axial velocity and the time dependent oscillatory axial velocity are calculated...
Accelerated flows of a magnetohydrodynamic (MHD) second grade fluid over an oscillating plate in a porous medium and rotating frame
December 2011
The aim of this paper is to determine the exact solutions for the velocity field related to the magnetohydrodynamic (MHD) and rotating flow of a second grade fluid in a porous medium induced by accelerated flows over an oscillating plate. This is accomplished by using the Fourier sine and Laplace transforms. Two explicit flow situations of the fluid are considered. In each case, both sine and cosine...
Study of slip and induced magnetic field on the peristaltic flow of pseudoplastic fluid
December 2011
Effects of slip and induced magnetic field on the peristaltic flow of pseudoplastic fluid have been investigated. The corresponding shear stress is employed in defining the slip condition. The fluid is considered in a channel with non-conducting walls. The arising flow problem is solved in view of the assumptions of long wavelength and low Reynolds number. The stream function, pressure gradient and magnetic...
Modified quadratic shepard and radial basis functions interpolations for determination of orthometric heights from global positioning system (GPS) heights
December 2011
We can obtain the position of any point on earth easily, accurately and quickly as geocentric coordinates (X, Y, Z) or geodetic coordinates (Ø, λ, h) in the World Geodetic System (WGS84) coordinate system with global positioning system (GPS) technique widely used in engineering studies today. However, we need to convert the ellipsoid height (h) to orthometric height to be able to...
Synthesis, spectral characterization and crystal structural of 1-(2-Morpholinoethyl)-3-(3-phenylacryloyl)thiourea
December 2011
Novel cinnamoyl thiourea derivative of 2-morpholino ethylamine, namely 1-(2-Morpholinoethyl)-3-(3-phenylacryloyl)thiourea have been successfully synthesized. The reaction of cinnamoylisothiocyanate with 2-morpholino ethylamine gave the compounds (I). The new compound was analyzed and characterized by typical spectroscopic techniques, namely IR and 1H and 13C multi-nuclear magnetic resonance (NMR). The...
New-generation optical access system based on the thin film filter technology
December 2011
Dense wavelength division multiplexing-direct scheme with two thin film filters (full width half maximum bandwidth 100 and 200 GHz) for broadband access has been realized to evaluate the minimal channel interval for each thin film filter needed for a satisfactory bit error ratio. From the results, the minimal channel interval has been established for both thin film filters that ensure reliable data...
Symmetry reductions and exact solutions of a variable coefficient (2+1)-Zakharov-Kuznetsov equation
December 2011
We study the generalized (2+1)-Zakharov-Kuznetsov (ZK) equation of time dependent variable coefficients from the Lie group-theoretic point of view. The Lie point symmetry generators of a special form of the class of equations are derived. We classify the Lie point symmetry generators to obtain the optimal system of one-dimensional subalgebras of the Lie symmetry algebras. These subalgebras are then used to...
The modified alternative -expansion method for finding the exact solutions of nonlinear PDEs in mathematical physics
December 2011
In this article, we construct new exact traveling wave solutions of some nonlinear evolution equations in mathematical physics with the aid of the modified alternative –expansion method. The nonlinear equations under investigation include, the (1+1)-dimensional Drinfeld-Sokolov-Wilson (DSW) equation, the travelling regularised long wave (TRLW) equation, the Caudrey-Dodd-Gibbon (CDG) equation and...
Some properties of Rad-supplemented modules
December 2011
No doubt, a notion of the Rad-supplemented modules can constitute a very important situation in the module theory, because of a generalization of the notion of supplemented modules. Therefore, our work presents a key role mainly in some properties and characterizations of Rad-supplement submodules and Rad-supplemented modules. In this paper, we show that, for a duo module M...
Design, realization and optimization of a photovoltaic system equipped with analog maximum power point tracking (MPPT) command and detection circuit of the dysfunction and convergence the system (CDCS)
December 2011
In this paper, we analyze the design, realization and optimization of a photovoltaic (PV) system equipped with a maximum power point tracking (MPPT) command and detection circuit of dysfunction and convergence the system (CDCS) to the new maximum power point (MPP) following a perturbation due to the meteorological variation (solar radiation, temperature, ..) and the load. We have analyzed in depth manner the...
Anti-swing control of a double-pendulum-type overhead crane using parallel distributed fuzzy LQR controller
December 2011
One of the common industrial structures that are used widely in many harbors and factories, and buildings is overhead crane. Overhead cranes are usually operated manually or by some conventional control methods. In this paper, we propose a hybrid controller, that includes both position regulation and anti-swing control. According to Takagi-Sugeno fuzzy model of an overhead crane, a fuzzy controller designed...
A data driven model of laser light scattering in metallic rough surfaces
December 2011
A new model of laser light scattering was obtained from experimental profilometer data and ray casting technique. Modelling was based on variables common to an angle resolved scatterometer and geometric optics. With this model, it was possible to obtain the scattering patterns, masking and shadowing effects, multiple lobes and backscattering. As advantage of the model, it was unnecessary to make statistical...
A committee machine approach to multiple response optimization
December 2011
Multiple responses optimization problems have three phases including design of experiments, modeling and optimization. Artificial neural networks and genetic algorithm are applied for second and third phases. Committee machines include some experts such as some neural networks which operate together to get response. Current article applies a committee machine including four different artificial...
Page 22 of 52, showing 50 records out of 2572 total, starting on record 1051, ending on 1100
Advertisement
Advertisement
