February 2011
Improvement of gas turbine performance based on inlet air cooling systems: A technical review
Performance of a gas turbine is mainly depends on the inlet air temperature. The power output of a gas turbine depends on the flow of mass through it. This is precisely the reason why on hot days, when air is less dense, power output falls off. A rise of 1°C temperature of inlet air decreases the power output by 1%. The aim of this paper is to review up to date techniques that were developed to cool...
February 2011
Spatial analysis of a post-socialist city: Case of Tirana-Albania
This study proposes an analysis model to see how urban spatial configuration in case of post-socialist Tirana City transformed over time. The analysis of city network road and comercial facilities distribution of Tirana City helps us to examine urban land use variation and the urban spatial structure. The study also reviews urban spatial structure model of the city as well. The main principles of space...
February 2011
Synthesis and characterization of gold nanoparticles using 1-alkyl, 3-methyl imidazolium based ionic liquids
The formation of gold nanoparticles has been studied via the reduction of the metal salts in different Ionic Liquids (Ils) based on the 1-alkyl-3-methyl-imidazolium cation and different anions. Particles were grown at different temperatures for 24 h. The structure and morphology of the resulting nanomaterials has been studied via wide angle x-ray scattering (WAXS), transmission electron microscopy (TEM),...
February 2011
Use of K-means clustering in migraine detection by using EEG records under flash stimulation
In this study, a new migraine analysis method was proposed by using EEG (electroencephalography) signals under flash stimulation in time domain. EEG signal is one of the most complex biomedical signals due to its complex nature. Therefore, these types of signals are commonly pre-processed before the analysis procedure. Since, pre-processing techniques affect the analysis results positively or negatively, the...
February 2011
A bounded random process model and its application in heart rate variability analysis
A bounded random process (BRP) model was developed in this paper to interpret why approximate entropy (ApEn) can not describe the stochastic characteristic of Brownian motion time series correctly. Low ApEn value, generally implying presence of determinacy, also existed in Brownian motion series, a stochastic process. The BRP model investigated this phenomenon through quantifying the relationship between ApEn...
February 2011
A microstrip metamaterial split ring resonator
This paper introduces a new low cost, robust microstrip structure, exhibiting metamaterial property, as a replacement of conventional bulky metamaterials structures. These types of planar microstrip structures are very useful for applications where space of equipment is a constraint. Although, the structure is inspired by Split-Ring resonator (SRR), it does not incorporate additional metallic rod for...
February 2011
Enhancement of real-time multi-patient monitoring system based on wireless sensor networks
Portable patient monitoring device has become increasingly important in Hospital wards to record real-time data during normal activity for better treatment. However, the current quality and reliability have not been satisfactory due to the size, weight, distance of coverage and also high power consumption. This paper provides several solutions for enhancing the reliability and improving the power management...
February 2011
Equations of unsteady flow in curved trapezoidal channels
Investigation of unsteady flows in curved channels and solving the related equations are one of the main issues in hydraulics. In this study, the numerical model proposed by ‘beam and warming’ using the finite difference method is presented to solve unsteady flow equations in curved-trapezoidal channels and it has been used by taking advantage of modified Model (regarding some...
February 2011
Effects of different irrigation regimes and nitrogenous fertilizer on yield and growth parameters of maize
A field experiment was carried out to find out the response on yield and yield contributing parameters of maize (cv. Bornali) to water stress and nitrogenous fertilizer. The experiment included two factors such as five irrigation regimes and four nitrogen levels. Texturally, the soil was silty loam. Yield and yield contributing characters were significantly affected due to the application of irrigation and...
February 2011
Effect of crumb rubber concentration on the physical and rheological properties of rubberised bitumen binders
The increase use of crumb rubber in flexible pavements requires the better understanding of its effect on physical and rheological properties of rubberised bitumen binders. The performance properties of rubberised bitumen binder are influenced by the blending conditions and crumb rubber content. The main objective of this research is to investigate the effect of various crumb rubber content on the physical,...
February 2011
Use of the simplex method to optimize analytical condition in structural analysis
The nonlinear behavior is approximated as a sequence of successively changing linear systems over a short time interval. Solution of nonlinear equations needs to iterative method such as Iterative algorithm. Iterative method attempts to solve a problem by finding successive approximations. The present study is concerned with methods of nonlinear static and dynamic analysis of structures,...
February 2011
Optimization of the configuration of infill walls in order to increase seismic resistance of building structures
The behavior of empty frames and infilled frames is very different. The infill walls are considered as non-structural elements and are ignored in the analysis; these elements tend to interact with the frame in case of lateral load effect. The aim of this paper is to indicate the contribution of infill walls in the earthquake resistant building design. Three different type of configuration of infill walls are...
February 2011
Effect of calcium chloride and kaolinite on shear strength and shrinkage of cement grout
Grouting is injecting a liquid (cement and additives) into voids within a structure or soft soils for displacing the gases and liquids from within these. The varieties of additives for different grouting purposes are using with cement. Calcium chloride is known as accelerator in the grout, it causes to decrease the set time of grout and it has a minor effect on fresh grout properties. Kaolinite or some other fine...
February 2011
Green transportation planning and regional sustainable development within metropolitan regions: The role of traffic pollutant inventory in decision making
Increasingly, the Chinese metropolitan transportation organizations face many challenges ahead, as they try to meet the Nation's mobility requirements, decrease congestion impacts, and improve the level of air quality. However, the previous modeling tools (for example, land use, travel demand, and emission models) were not designed, nor do they generally provide visible feedback between adjacent...
February 2011
Experimental research on high-fluidity and super high-early strength concrete for cement pavement repairing
The concrete used for pavement repair must have a very high-early strength for opening to traffic, good anti-shrinkage and anti-cracking performance, and interfacial bond between old and new concrete surface, besides the basic pavement performance. High fluidity is also needed for simplifying repairing operation and for guaranteeing the repair quality. In a sense, high fluidity is conflict with super...
February 2011
Long term behaviour of a retaining wall resting on clayey soil
The magnitude and distribution of lateral earth pressure acting on a retaining wall due to dry cohesionless backfilling material and existence of saturated consolidated clay in the foundation are studied by a series of two-dimensional plane-strain analyses. For the particular wall geometry and soil condition, effects of wall height and elapsed time of consolidation are investigated and discussed. The analysis...
February 2011
Experimental study of a multi-purpose PV-refrigerator system
Refrigerators used in daily life are one of the indispensable tools. Uninterrupted power should be supplied to refrigerators in order to maintain cooling service. Photovoltaic (PV) systems provide an independent, reliable electrical power source at the point of use, making it particularly suited to remote locations. For this reason, nowadays, the use of PV solar energy in refrigeration has been increasing in...
February 2011
Investigation of the relationship between some basic flow properties of shea butter biodiesel and their blends with diesel fuel
In this study, the density, viscosity, cloud and pour points of shea butter biodiesel-diesel fuel blends were measured following ASTM test methods. In order to predict these properties, mixing rule was evaluated as a function of the volume fraction of biodiesel in the blend. The effects of biodiesel fraction on each of these properties in addition to the effects of temperature on density and viscosity were...
February 2011
A novel design of lower vehicle arm based on optimization technique
In the automotive industry, the riding comfort and handling qualities of an automobile are greatly affected by the suspension system. The scenario of this paper presents the Robust Design of suspension arm using a technique Stochastic Design Improvement (SDI) based on Monte Carlo Simulation (MCS) then also to identify the critical location and to find optimum result and suitable materials for the suspension arm. The...
February 2011
Anthropometric study among adults of different ethnicity in Malaysia
A study was done to determine the differences of anthropometrics data among three ethnic populations in Malaysia. Measurements were collected among 300 respondents representing 150 males and 150 females ranging from the age of 18 to 24 years. A total of thirty-three body dimensions were measured. The statistical test includes, mean, standard deviation, standard error of mean, coefficient of variation,...
February 2011
A comparison of geoid height obtained with adaptive neural fuzzy inference systems and polynomial coefficients methods
Three-dimensional (horizontal, vertical and ellipsoidal heights) coordinates of a point can be obtained using the GNSS (global navigation satellite system) systems. Although, ellipsoid heights have a geometrical meaning, height is actually a geopotential value. Therefore, determination of physical reference surface (sea level or geoid) is of particular importance in geodetic studies. Although, GNSS...
February 2011
Conformally Osserman Lorentzian manifolds satisfying a certain condition on the Ricci tensor
Let , , be an n-dimensional homogeneous Lorentzian manifold of which the Jacobi operator associated to the Weyl conformal curvature tensor has constant eigenvalues on the bundle of unit timelike (spacelike) tangent vectors (known as conformally Osserman Lorentzian manifolds). Then is a conformally Osserman Lorentzian manifold if and only if is a conformally flat...
February 2011
Sâlâgean-type harmonic univalent functions
The purpose of the present paper is to introduce new classes of harmonic univalent functions defined by using the Sâlâgean differential operator and to investigate various properties of these classes. Key words: Harmonic functions, Sâlâgean derivative, coefficient bounds, distortion bounds, extreme points, neighborhood.
February 2011
Estimating future development of the Turkish plywood sector by the use of models affecting this forest industry sector
In order to benefit more rationally from the wood raw material, a very important natural source today, we should especially deal with the industrial branch processing it. Change and development in the production, import and export quantity and values of Turkish forestry and forest industrial sector has eventually required planning both national forest resources and the sector using these resources on...
February 2011
Matrix stability of the difference schemes for nonlocal boundary value problems for parabolic differential equations
In this work, a first order and second order difference schemes, namely Rothe and Crank-Nicholson, respectively, for solving nonlocal boundary value problems for parabolic differential equations are presented. The stability of the difference schemes are proved by using the matrix stability approach. Numerical results are provided to illustrate the accuracy and efficiency of the schemes. Key words: Matrix...
February 2011
A genetic algorithms based approach for conflicts resolution in requirement
With the improvements of technologies, software systems have been more complex then ever before. This requires new approaches to improve software development processes so that they sufficiently and efficiently meet these challenges. Requirement engineering in this regard facing many problems in which conflicts resolution gained very little popularity. In this paper we present motivation toward requirement...
February 2011
Hybrid model of chaotic signal and complete binary tree for image encryption
In this paper, a new method was proposed for image encryption using chaotic signals and complete binary tree. In this method, perfect binary tree was utilized for further complexity of the encryption algorithm, higher security and changing the amount of gray scale of each pixel of the original image. Studying the obtained results of the performed experiments, high resistance of the proposed method against...
February 2011
Application of GIS for determination of groundwater quality suitable in crops influenced by irrigation water in the Damghan region of Iran
In order to evaluate the quality of groundwater in Damghan plain for irrigation purposes, 199 surveyed wells with GPS data used to produce the map. The features that generally had considered for evaluation of the suitable quality of groundwater for irrigation are salinity, water infiltration rate, and specific ion toxicity. The SAR , ions Ca2+,Mg2+, Na+, K+, CO3 2-, HCO3-– , SO42- ,...
February 2011
Porous ferrite synthesis and catalytic effect on benzene degradation
In this study, feasibility of porous ferrite (MFe2O4) synthesis and catalytic effect on benzene degradation was evaluated. Various types of ferrites were synthesized by CuO, ZnO, NiO, and Fe2O3 under different Fe/M molar ratios and sintering temperatures. Porous ferrite synthesized by NiO, Fe2O3, polyvinyl alcohol (PVA) and kaolinite addition with appropriate sintering conditions were used in column...
February 2011
Reducing ammonia loss from urea and improving soil exchangeable ammonium and available nitrate in non waterlogged soils through mixing zeolite and sago (Metroxylon sagu) waste water
Ammonia loss from urea significantly reduces urea-N use efficiency. The objective of this study was to determine the effect of mixing urea with zeolite and sago (Metroxylon sagu) waste water on ammonia volatilization, soil exchangeable ammonium and available nitrate compared with urea alone. The mixtures significantly reduced ammonia loss by 22 to 41% compared with urea alone (straight urea, 46% N)....
February 2011
Effective characterization of specific hydrocarbon and their mixtures using LIR
Linear Isotherm Regularity (LIR) is a statistical based valid method for a wide range of applications. This method depends much on the p-v-T experimental data. The determined data for certain hydrocarbons and their mixtures studied in this paper are scares. Hence we try to use LIR method for the prediction of the packing fraction and structure factor S(Q), of specific pure...
February 2011
The role of pH on the second harmonic response of glycine sodium nitrate (GSN)
In this work we have done a study of RAMAN spectroscopy on glycine sodium nitrate crystals. This study was supported with the respective X-ray diffraction and second-harmonic generation signal detection. The goal of this work is to modify the charge of glycine sodium nitrate in order to obtain three electric behaviors (Zwitterionic, Cationic, and Anionic) and perform the vibrational study on the...
February 2011
Relativistic scattering state solutions of the Makarov potential
In this article, we exactly investigate scattering states solutions of the Klein-Gordon equation with the Makarov potential. The normalized polar angle wave functions are obtained by using the Nikiforov-Uvarov method and the normalized radial wave functions of scattering states are expressed in terms of confluent hypergeometric functions. We have also discussed analytical properties of the scattering...
February 2011
First principles studies of band structure calculations of 6H-SiC and 4C-SiC using pseudopotential approches
We have studied the band structure properties of SiC in wurtzite and zincblende crystal structures. In our calculations, we have adopted a pseudopotential approach based on the Density Functional Theory (DFT). We have calculated the band structure and density of state (DOS) and therefore, the changes of the energy gap of this compound with crystal structure. The quality of the used pseudopotential was tested...
February 2011
Calculation of 8+ Isomers of even-even Nuclei 76Ni to 94Pd for N = 48 neutrons
Study of the properties of nuclear isomers is a current research focus. We have studied the systematic 8+ isomeric levels, half-lives, deformation parameters, and reduced transition probabilities between QUOTE state of even-even 76Ni to 94Pd nuclei for N = 48 neutrons. The calculated half-lives and quadrupole moments are compared with the experimental values....
February 2011
Amplitude versus offset (AVO) analysis modelling in hydrocarbon exploration: A case study
In this study, the geological model used for amplitude versus offset (AVO) analysis, was created by synthetic well logs. The geological model is comprised of shale, gassy-sand, clay and sand layers. The synthetic seismic records including 230 shooting and 60 folds were constructed over the model. The data processing has been applied to the synthetic records. After the data processing, AVO analysis has been...
February 2011
Using spectral mapping techniques on short wave infrared bands of ASTER remote sensing data for alteration mineral mapping in SE Iran
Spectral mapping techniques were applied on shortwave infrared of advanced spaceborne thermal emission and reflection radiometer (ASTER) data for discriminating between hydrothermal alteration zones, and the identification of high potential mineralized lithologic unit associated with hydrothermal porphyry copper mineralization in the Central Iranian Volcanic Belt. In this study, shortwave infrared radiations...
February 2011
Securing peer-to-peer mobile communications using public key cryptography: New security strategy
Mobile phones are considered to be the most common communication devices in history. Recently, mobile phones are not only used for casual greetings but also, sending and receiving important data such as, social security numbers, bank account details and passwords. Public key cryptography is a proven security solution, which can be used to secure the mobile communications. Several researchers have...
February 2011
Physics in preschool
Even though physics and preschool are two concepts not generally used in the same context, physics is an issue of importance in the preschool period. Physics activities stimulate children’s inquiry and problem solving skills, and also support children’s social and language skills. This paper presents a conceptual framework about using physics in preschool settings. It shows techniques that may be...
February 2011
The use of ICT tools in physical sciences education
ICT are nowadays, a reality in Spanish education. Although it has been a tough job, their use in physical sciences education has also increased in the last few years. But even with that, it is not clear whether students like them, use them and get any real profit from them. In this work we tried to analyse several aspects of the use of ICT in Spanish physical sciences education system, as which tools are used...
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