Causal analysis and calculation of the steam turbine efficiency of a thermal power plant
October 2012
After a presentation of the functionality of steam turbines of thermal power plants, we present the method of enthalpy difference used for the calculation of the steam turbine efficiency. This is why we present a stratification survey by circuit, by equipment and by organ. The objective is to determine the possible reasons for the deterioration of the heat rate of a thermal power plant at the level of a steam...
An alternative approach for unsupervised cluster based image retrieval
October 2012
In this research, we proposed an alternative method to retrieve images from its clusters which is determined by its color histogram. In other approach, it is called cluster based image retrieval model. One common problem with conventional content based image retrieval (CBIR) system is that the output data contains too many non-relevant feedbacks due to the indistinct symmetry of semantic gap. In this paper,...
An adaptive neuro-fuzzy digital filter
October 2012
This work describes the neural net as identification process, considering an adaptation that adjusts the parameters in dynamical form using a proportional condition. Neural nets have problems when the weight gains are dynamically modified in a specific environment with stochastic smooth conditions adjusting in some sense in accordance with a reference signal. This output and identification error has...
Research on indoor positioning algorithm based on powerline
October 2012
In this research, the basic principle of data acquisition based on powerline is introduced.Probabilistic neural network (PNN) is applied to indoor location system aiming at environment of strong noise indoor and the reason of PNN applied to indoor location system based on powerline is discussed in detail. According to characteristics of transmitted signal by powerline, the signal is...
Shell model calculations on even nuclei near 208Pb
October 2012
Binding energy of the ground state, energy levels and the B(E2) values of both positive and negative parities for 202,204Au, 202-206Hg, 202-206Tl and 202-206Pb isotopes have been calculated through shell model calculations using the shell model code OXBASH for Windows employing the Modified Kuo-Herling interaction (khhe) for neutron and proton hole orbits in 208Pb. The binding...
First principles study of some thermodynamic properties of Calcium Indium (CaIn) intermetallic compound
October 2012
Calculations of some thermodynamic properties of Calcium Indium (CaIn) intermetallic compounds are carried out using the quasi harmonic Debye model. The Debye temperature was studied as a function of both lattice temperature and unit cell volume. The calculations showed that the Debye temperature decreases slowly with elevation of the temperature. It was found that the Debye temperature varies from 130...
Forecasting the output of Taiwan’s integrated circuit (IC) industry using empirical mode decomposition and support vector machines
October 2012
As the production values in the integrated circuit (IC) industry are inherently nonlinear and non-stationary, it is regarded as one of the most challenging tasks for practitioners and academics. This study proposed a hybrid methodology by combining empirical mode decomposition (EMD) and support vector regression (SVR) in production values forecasting. The proposed approach first...
Electrochemical polymerization and Raman study of polypyrrole and polyaniline thin films
October 2012
In this paper we present thin films of polypyrrole (PPY) and polyaniline (PANi) which have been synthesized electrochemically on Gold electrode by direct oxidation of pyrrole and aniline in Acetonitrille using three electrodes. Raman spectroscopy results were analyzed in terms of normal modes, and spectra were obtained using 633 nm He-Ne laser. It was found that Raman spectra depend on the doping level of PPY...
Biodegradation of oil spill dispersants in natural aquatic ecosystem
October 2012
The biodegradability of three oil spill dispersants (teepol, sodium dodeocyl sulphate (SDS) and corexit 9527) in a brackish water were monitored using the ratio of dissolved organic carbon (DOC) to total organic carbon (TOC) (primary biodegradation), the ratio of inorganic carbon to total organic carbon (mineralization) and total microbial (bacteria and fungi) population. The study lasted for 20 days....
Approximate analytic solutions for non-linear oscillators with fractional-order restoring force by means of the optimal variational iteration method
September 2012
In this paper, a new approach, namely the optimal variational iteration method (OVIM) was proposed to investigate oscillators with fractional-power nonlinearities. It was illustrated that this approach is very effective and convenient and does not require linearization or small parameter. Unlike other classical iteration methods, only one iteration leads to highly accurate results, due to a rigorous procedure...
Experimental study of structural and optical band gap of nickel doped tin oxide nanoparticles
September 2012
Nickel-doped tin oxide nanoparticles were synthesized by a simple co-precipitation method. The structural, morphological and optical properties of these nanoparticles were investigated using X-ray diffraction, transmission electron microscopy and UV-Vis spectroscopy. The X-ray diffraction revealed that all samples are pure rutile-type tetragonal phase; and the nickel doping did not change the...
Application of geographical information system (GIS) to groundwater quality investigation: A case study of Mardan district, Pakistan
September 2012
A study was conducted to determine the groundwater quality of Mardan salinity control and reclamation project (SCARP) area and its suitability for irrigation purposes. A total of 18 villages were selected and water samples were taken from each one. Spatial data of the locations were taken by Magellan GPS Receiver. These samples were analyzed in the laboratory and then compared with the irrigation water...
Geomagnetic field variations at dip equatorial latitudes of West Africa
September 2012
A comprehensive study of geomagnetic field variations has been carried out at the dip equatorial latitudes of West Africa. The data obtained during the 1993 French participation in the International Equatorial Electrojet Year experiment in Africa was used for the analysis. Only the quiet condition was examined. Variation in the three geomagnetic field elements (H, D, and Z) showed more variability in D...
Calculation of two-center overlap integrals over slater-type orbitals via fourier transform convolution theorem
September 2012
Formulas for two-center overlap integrals over slater type orbitals are presented. The established formula contains Gaunt coefficients and auxiliary functions. Analytical and recurrence relations for these auxiliary functions have been presented. The efficiency of the presented algorithm for the evaluation of two-center overlap integrals depends strictly on the accurate calculation of these auxiliary...
Statistical evaluation of hardness behavior in a thermally aged A356.0-type Al-Si-Mg alloy
September 2012
A statistical study has been made on the isothermal treatments of A356.0-type Al-Si-Mg alloy. The reprocessed alloy was subjected to hardness evaluation. The values obtained were processed using statistical package for social scientists (SPSS) software to compare all tempers and multiple-step thermal ageing treatment (MSTAT) values by analysis of variance (ANOVA) and Pearson Correlation Index. Equally, a...
Propagation of a pulsed laser through a plasma based waveguide with a parabolic profile of the electron density
September 2012
The paper presents a numerical study of the periodic self focusing behavior of a laser pulse propagation in a gas filled capillary plasma with a parabolic electron density profile. An implicit and inherently stable Crank-Nicholson method was used to demonstrate the periodic laser beam waist behavior inside the tube discharge. The dependence of the tube radius and beam waist on maximum intensity delivered to...
Analysis of well log and pressure data of the gas-bearing sand reservoirs of Kafr El-Sheikh formation: Case study from the off-shore Nile Delta-Egypt
September 2012
The off-shore Nile Delta is one of the most promising areas for gas exploration and production in Egypt and the Middle East. The present study deals with evaluation of the gas-bearing sand anomalies at the off-shore Nile Delta of Egypt using the available well logging and the pressure datasets. The early to middle Pliocene sediments (Kafr El Sheikh Formation) of eleven wells scattered in the Darfeel and Port...
Spectral discrimination between mining blasts and natural earthquakes: Application to the vicinity of Tunçbilek mining area, Western Turkey
September 2012
The objective of our paper is to develop time and frequency techniques to characterize mine or quarry blasts and discriminate these events from natural earthquakes. We are examining well documented mine blasts in the Kütahya Province in western Turkey that is an ideal case study since there are frequent confirmed routine mining blasts at Tunçbilek mining area. Particularly, Turkey’s richest...
Solvent effect on absorption and fluorescence of 1-1` binaphtalene aromatic molecule
September 2012
The absorption and fluorescence spectra of 1-1` Binaphthalene (1-1` BN) molecule have been studied at different solution states in polar and non polar solvents at room temperature. It is noticed that the absorption spectrum of this molecule is similar to that of Naphthalene molecule at this temperature. The fluorescence spectrum of 1-1`BN molecule differs from that of the Naphthalene molecule. It is also...
Analysis of precipitation in Central México: Trends, self-affinity and important frequencies
September 2012
Long–term monthly precipitation series registered at 56 meteorological stations located within Mexico’s state of Zacatecas were analyzed in order to identify their trends. We analyzed the power spectrum signals of precipitation anomaly series in order to identify their important frequencies and its possible connection with periodic phenomena. We found negative linear trends for 28 out of 56...
Estimation of permeability using artificial neural networks and regression analysis in an Iran oil field
September 2012
Porosity and permeability are two important parameters to be considered in evaluating the characteristics of an oil field. The permeability is the key parameter in describing a hydrocarbon reservoir. In fact, knowing the exact values of permeability is an effective, efficient and important tool for engineers in the oil production process and management of a field. Over the years, these two petrophysical...
Mineral analysis of an artificial pond sediment samples from the Western Cape Province, South Africa
September 2012
Hussein K. Okoro1*, Olalekan S. Fatoki1, Folahan A. Adekola2, Bhekumusa J. Ximba1and Reinette G. Snyman3
A multi-agent-based model for distributed system processing
September 2012
Distributed systems have several challenges related to large datasets and numerous communication channels, and it is desirable to design systems that optimize the quality of services within the system and improve throughput to come up with the optimal result. In this paper, we present a model for multiagent system for distributed processing of tasks, where the processes continue to operate despite network...
Investigation of structural, morphological and optical properties of electrodeposited SnO2 thin films
September 2012
In this study, we investigated the deposition time effects on structural, morphological and optical properties of electrodeposited SnO2 thin films. Tin oxide thin films were deposited at 10, 15 and 20 min deposition times and characterized using X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive X-ray spectrometer (EDX) and UV-VIS spectrometer. XRD results showed that...
Particle-in-cell Monte Carlo simulation using free path method for radio frequency argon discharge modelling: Comparison with experiment
August 2012
A specific particle-in-cell Monte Carlo model which is based on an optimized free path method for collision treatment has been used to simulate a radiofrequency (RF) argon discharge at low pressure for parallel-plate geometry. In this model, the free path determination is independent of the electron energy; it depends only on the maximum of the total cross sections. The obtained results are in excellent...
Residual chlorine modeling in water distribution system: A case study of defence housing scheme (DHS), Lahore
August 2012
This Aricle is retracted
Estimation of global solar radiation on horizontal surface in Erzincan, Turkey
August 2012
In the applications of solar energy, the solar radiation data and their components in a region must be known for the design of a system. In the locations where no solar radiation data is available, this parameter can be determined by performing a reasonable correlation. In the study, the models of global solar radiation on the horizontal surface in the literature are investigated, and new empirical models...
Effects of different combinations of Hoagland’s solution and Azolla filiculoides on growth and development of Beta vulgaris subsp. cycla ‘Fordhook Giant’ grown in hydroponic cultures
August 2012
The comparisons of plant height, leaf number, foliage colour, fresh and dry weight of Beta vulgaris subsp. cycla ‘Fordhook Giant’ were evaluated in the glasshouse over a period of 8 week. The B. vulgaris plants were exposed to different nutrient solutions in which some contained Azolla filiculoides. Each treatment was replicated four times. The aim of this study...
Multipath adaptive tabu search: Its convergence and application to identification problem
August 2012
This article presents new metaheuristics denoted as multipath adaptive tabu search (MATS). The algorithms employ adaptive tabu search (ATS) as the main search heuristics, and incorporate partitioning, sequencing, and discarding mechanisms, respectively. The algorithms are explained in details with their convergence analyses presented. The article also gives an illustrative application of...
Collapse settlement behaviour of remoulded and undisturbed weathered quartzite
August 2012
The behaviour of semi arid residual soils derived from the weathering of Johannesburg quartzite are difficult to predict because of their heterogeneous particle constitution and weakly bonded structure. The collapse behaviour of undisturbed and remoulded weathered Johannesburg quartzite was investigated; and the reliability of the collapse settlement data was also evaluated. The results showed that a...
Myocardial ischemia diagnosis by pulse wave derived form factor analysis
August 2012
Pulse wave analysis with computerized diagnosis was used for myocardial ischemia patients. Novel feature derived from form factor of pulse signal was investigated. Form factor is estimated from variance of pulse signal waveform. Pulse waves were measured using newly developed three-axis sphygmography. Three groups participated in this study: 16 patients diagnosed with myocardial ischemia (positive), 19...
Investigation of strain rate and temperature effects on mechanical behavior of functionally graded steels (FGSs) under hot compression
August 2012
Hot deformation behavior of functionally graded steels (FGSs) has been investigated via conducting hot compression tests at different temperatures and strain rates by the researchers. FGSs are a group of functionally graded materials (FGMs) consisting of ferrite (α), austenite (γ), bainite (β) and martensite (M) phases placed over each other in different configurations and produced...
Incremental Fourier transform of triangular closed 2-manifolds
August 2012
In this paper we present a technique for the calculation of the Fourier transform for functions defined on oriented closed 2-manifolds. The objects are given as oriented triangular meshes. Our focus in this paper is on the characteristic function of the model, that is, the function that is equal to one inside the model and zero outside. The advantage of our approach is that it provides an automatic, simple,...
Comparative evaluation of rectangular and pyramid-shaped solar stills using saline water
August 2012
The long-term aim of this study is to develop low cost technology for the poor rural dwellers of Nigeria along the coastal areas. To this end, a comparative evaluation of two basin type passive solar stills was undertaken by distillation of salty water. The solar stills were rectangular-shaped and pyramid-shaped type. Both stills were made of the same material and of the same size. The top of the...
Metal content determination and antimicrobial properties of ochre from North-central Nigeria
August 2012
Metal content of the ochre was determined by Flame photometry and atomic adsorption spectroscopic technique while the antimicrobial activity of ochre from North-Central Nigeria against selected organisms were investigated using standard methods. The results revealed the presence of Fe, Mg, Na, K, Ca, Mn, Cu, and Zn in ochre. Fe had the highest concentration (1122.7 mg/kg) followed by Mg (193.0 mg/kg). The...
Investigation of hospital wastewater treatment plant efficiency in north of Iran during 2010-201
August 2012
Hospital wastewater contains pathogenic agents and hazardous compounds; so, it will cause many risks on environmental and human health of different communities. The aim of this research was to investigate the efficiency of hospital wastewater treatment plant in north of Iran. This cross-sectional descriptive research was done on four hospital wastewater treatment plant in north of Iran during 2010 to...
A new method for least squares identification of parameters of the transcendental equations
August 2012
Transcendental models are often solved by using a different approach, which can be a derivative free, direct optimisation or iterative linearization method. All these approaches require guess values for the unknown parameters to start the iteration procedure. However, if the transcendental model involves several parameters, some of these methods become very cumbersome and computationally expensive. A new...
Prediction of concrete compressive strength in buildings that would be reinforced by fuzzy logic
August 2012
In this study, core samples were taken from column or reinforced wall in order to make reinforcement or restoration. The effect of the element height and volume of voids of these samples to the compressive strength were investigated. C25 type ready to use concrete was used and a column without steel was produced. During the production process, 15 cm reference cube samples were taken from the fresh...
Study of calcined halloysite clay as pozzolanic material and its potential use in mortars
August 2012
In this research, we will try to understand the mechanisms involved in the introduction of calcined clays in substitution for a portion of cement in the manufacture of mortars. This experimental work focuses on the recovery of a clay type haloysite quality three, from eastern Algeria. This clay comes from a region called Djbel Debbagh hence its name (DD3). The main objective of this study is to see the...
A seismological view to Gökova region at southwestern Turkey
August 2012
Recent seismic activity in Gökova region can be characterized by earthquake swarms, which mostly occured during 2004 and 2005. This activity was continued for seven months and 1558 seismic events were recorded at this period. The b-value of Guthenberg-Richter relation is investigated for this earthquake swarm and a high b-value is found as 1.73±0.08 using the maximum likelihood method. In...
The study of coefficient of friction for light motorcycle sliding on asphalt road
August 2012
The very high number of motorcycles in Taiwan contributes to its high accident rate. Handling a two-wheeled motorcycle during an accident is difficult, frequently resulting in falls and sliding along the road surface. Speed is often used to identify the party at fault. The friction coefficient and scrape mark length are typically used to estimate vehicle speed. Most literature focused on heavy motorcycles,...
Macrophyte waste stabilization ponds: An option for municipal wastewater treatment
August 2012
The objective of this research is to evaluate the performance of macrophyte waste stabilization pond system for municipal wastewater collected from Taxila (Pakistan). A model of macrophyte waste stabilization pond system was operated for six trials with each trials comprising different detention times that is 3, 5, 7 and 10 days, respectively. For the treatment, locally available macrophyte (water hyacinth)...
Characteristics of total solar radiation in an urban tropical environment
August 2012
The maximum total solar radiation in Ibadan (7.38° N, 3.93° E), Nigeria occurred around 13 and 14 h local time (LT) and it varied from an average value of 584.3±10.9 Wm-2 in the wet season (April to October) to 642.5±10.8 Wm-2 in the dry season (November to March) throughout the period of 1997 to 2001. Maximum total solar radiation had two peaks, one in March/April/May...
A novel study in relation between the mass and gravity
August 2012
In this paper, by reviewing old as well as modern controversial findings, it was shown that gravity is a single unique phenomenon that after appearance attracts mass and particles around itself. This makes a misunderstanding of mass-gravity relation as cause and effect. Here, a discussion was put ahead, which concludes that mass; and actually energy condensation, cannot create gravity and it would be shown...
A survey of job recommender systems
July 2012
The Internet-based recruiting platforms become a primary recruitment channel in most companies. While such platforms decrease the recruitment time and advertisement cost, they suffer from an inappropriateness of traditional information retrieval techniques like the Boolean search methods. Consequently, a vast amount of candidates missed the opportunity of recruiting. The...
Unattached fractions and aerosol attached of radon progeny in indoor air
July 2012
The present study summarizes the experimental data on the activity concentrations of222Rn gas , unattached and attached short-lived222Rn progeny 218Po, 214Pb and 214Po in indoor air of Jeddah City, K.S.A. Jeddah city lies on the eastern bank of the red sea, South West the Kingdom of Saudi Arabia. The city is located between latitudes 21°...
Internal flow patterns behavior of a top heat mode closed-loop oscillating heat pipe with check valves (THMCLOHP/CV)
July 2012
An experimental study of the internal flow patterns of a top heat mode closed-loop oscillating heat pipe with check valves (THMCLOHP/CV) was carried out. In this study, the heat pipe was made of a Pyrex tube with an inner diameter of 2.4 mm which was bent into 10 meandering turns and filled with ethanol, R141b and R123 at a filling ratio of 50% by total volume. The number of check valves was 2 sets. The...
Estimating suspended sediment concentration using neural differential evolution (NDE), multi layer perceptron (MLP) and radial basis function (RBF) models
July 2012
Sediment transport has attracted the attention of engineers from various aspects and different methods have been used for its estimation. So, several experimental equations have been submitted by experts. Though the results of these methods have considerable differences with each other and with experimental observations, because the sediment measures have some limits, these equations can be used in...
Quality of irrigation and drinking water in Nangarparkar Region of Thar Desert of Pakistan
July 2012
The pioneer study evaluates water quality status in Nangarparkar area of Thar Desert of Pakistan. Water samples obtained from wells, ponds and storage tanks greatly varied in their chemical composition and nutrient contents. Percentage of hazardous well water samples for irrigation purpose were: pH: 30%; electrical conductivity (EC): 27%; total soluble salts (TSS): 100%; CO3–: 70%; HCO3–:...
Quantum simulation study of gate-all-around (GAA) silicon nanowire transistor and double gate metal oxide semiconductor field effect transistor (DG MOSFET)
July 2012
In this paper, electrical characteristics of the double gate metal oxide semiconductor field effect transistor (DG MOSFET) and that of gate all around silicon nanowire transistor (GAA SNWT) have been investigated. We have evaluated the variations of the threshold voltage, the subthreshold slope, drain-induced barrier lowering, ON and OFF state currents when channel length decreases. Quantum mechanical...
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