International Journal of
Physical Sciences

  • Abbreviation: Int. J. Phys. Sci.
  • Language: English
  • ISSN: 1992-1950
  • DOI: 10.5897/IJPS
  • Start Year: 2006
  • Published Articles: 2572

Table of Content: 23 October 2011; 6(25)

October 2011

Degradation studies of amines and alkanolamines during sour gas treatment process

Aqueous solutions of alkanolamines are widely used for the removal of acidic gases such as H2S, CO2, COS and CS2 in the sour gas treatment process. In spite of the resistance of alkanolamines to chemical breakdown, plant and laboratory reports indicate that, on prolonged use, alkanolamines may be transformed into undesirable products from which the amines are not easily recovered. This phenomenon, commonly referred...

Author(s): M. S. Islam, R. Yusoff, B. S. Ali, M. N. Islam and M. H. Chakrabarti        

October 2011

On fuzzify the notion of Grassmannianin fuzzy n-dimensional projective space

In this paper the partitions of fuzzy points of fuzzy -dimensional vector space into fuzzy 3-dimensional vector spaces and fuzzy n-dimensional projective space λ′ from fuzzy-dimensional vector space λ on V for n > 2, into fuzzy projective planes are given. Here, we restrict ourselves to the case, that a subspace should necessarily have the same values in its...

Author(s): Ziya Akça     

October 2011

Robust location algorithm based on weighted least-squares support vector machine (WLS-SVM) for non-line-of-sight environments

One of the main problems facing accurate location in wireless communication systems is non-line-of-sight (NLOS) propagation. Though learning location methods perform well in NLOS environments, learning location methods may be improved further since these methods do not consider outliers in the training data set. In this paper, we extend weighted least squares support vector machine (WLS-SVM) algorithm to mobile location...

Author(s): Huang Jiyan, Gui Guan and Wan Qun      

October 2011

Suboptimal sparse channel estimation for multicarrier underwater acoustic communications

Multipath channels often exhibit sparse structures in multicarrier underwater acoustic (MC-UWA) communication systems. Conventional linear channel estimators, such as least squares (LS) and minimum mean square error (MMSE) are considered as optimal solutions under the assumption of rich multipath. However, they often result in low spectral efficiency due to neglect of the sparsity in multipath...

Author(s): Nina Wang, Guan Gui, Zhi Zhang and Ping Zhang    

October 2011

Application of weighted average on modal parameters for damage detection algorithms: Case study on steel beam

This study verifies the use of the proposed weighting method by Fayyadh and Abdul Razak (2011a) for damage detection algorithms applied on cracked steel beam. The results of the proposed weighting method for two damage severity algorithms are presented. That is,one based on the natural frequencies and the other based on the mode shape vectors. In addition, the stiffness deterioration based on the mathematical...

Author(s): Moatasem M. Fayyadh and H. Abdul Razak   Department of Civil Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur, Malaysia.    

October 2011

An innovative new product development strategy: The Key success paths approach

Given the rapid changes in the high-tech industry and fierce global competition in the market, shortening the life cycle of a product is necessary. Such a backdrop highlights the role of new product development (NPD). Many studies have explored how the outcomes of NPD projects are affected by key success factors (KSFs). In this paper, we investigated key success paths (KSPs) approach by creating and implementing various...

Author(s): Mei-Fang Wu, Pao-Long Chang and Singa Wang Chiu  

October 2011

Overlapping Alldiff constraints: SAT versus CSP encoding application to the Sudoku

Constraint satisfaction problems (CSP) or Boolean satisfiability problem (SAT) are two well-known paradigms to model and solve combinatorial problems. Modeling and resolution of CSP is often strengthened by global constraints (e.g., Alldiff constraint). This paper highlights two different ways of handling specific structural information: a uniform propagation framework to handle (interleaved) Alldiff constraints with...

Author(s): Eric Monfroy, Broderick Crawford, Ricardo Soto, and Fernando Paredes      

October 2011

Development and application of an integrated multi-objective methodology for supplier selection

This study developed a hybrid supplier selection model, which combines multi-objective data envelopment analysis (MODEA) and multi-objective genetic algorithm (MOGA), called as MODP. MODEA involved the consideration of several supplier selection factors. In addition to maximizing the efficiency of the decision making unit (DMU) itself, the approach also took into account other DMUs, enabling minimization of the total...

Author(s): Z. H. Che, Tzu-An Chiang, H. S. Wang and Y. F. Chang      

October 2011

Hybrid differential evolution and gravitation search algorithm for unconstrained optimization

This paper proposed an algorithm called DE-GSA. The proposed algorithm incorporates both the concepts from Differential evolution algorithm (DE) and Gravitation search algorithm (GSA), updating particles not only by DE operators but also by GSA mechanisms. The proposed algorithm is tested on several benchmark functions including unimodal and multimodal test functions, multimodal test function with fix dimension, and...

Author(s): Xiangtao Li, Minghao Yin and Zhiqiang Ma      

October 2011

Characterization of a composite material in adobe subjected to natural weathering: The case of El Hara Djelfa- Algeria

This work presents an experimental study carried on the characterization of a local material polyphasic used for the interior temperature control in a climatic environment subjected to very important temperature variations. The physical and structural properties of the composite allowed a durability of the buildings during millenia. However, the raw ground is weakened by deterioration due to the effect of the...

Author(s): Lakhdar Salim Guebboub, Massaoud Hamiane, Mouhyddine Kadi-Hanifi and Said Kamel      

October 2011

Prototype expert system for material selection of polymeric composite automotive dashboard

As a consequence of rapid development in material technology, determination of the right material for a given engineering application was viewed as a crucial decision. Various polymer materials selection methods have been developed to assist designers to determine the right polymer for a given engineering application. This paper presents a new natural fibre composite material selection process for automotive dashboard...

Author(s): S. M. Sapuan, N. K. Mun, A. Hambali, H. Y. Lok, A. M. Fairuz and M. R. Ishak    

October 2011

Artificial-Neural-Network modeling of the compressive uniaxial stress dependence of ferroelectric hysteresis: An application to soft lead zirconate titanate ceramics

In this work, artificial neural network (ANN) modeling was used to model ferroelectric hysteresis under the influence of compressive uniaxial stress using the hysteresis data obtained from soft lead zirconate titanate as an application. The main objective is to model the role of external stress, including electric field perturbation, on the complex hysteresis properties, which are hysteresis area, remnant polarization,...

Author(s): Wimalin Laosiritaworn, Supattra Wongsaenmai, Rattikorn Yimnirun and Yongyut Laosiritaworn,    

October 2011

Generation of land cover map using geospatial tools: A case study from Ardebil, Iran

Remote sensing and geographical information system (GIS) have gained importance as powerful and efficient tools for land cover mapping. Digital image classification is generally performed to produce land cover maps from remote sensing data, particularly for large areas. In this study, IRS LISS III data was prepared for producing land cover map of study area, Ardebil, Iran. Digital image processing techniques were...

Author(s): Ehsan Sahebjalal and Ahmad Heidari      

October 2011

Evaluation of a collapsed anchored bored pile retaining system by using finite elements method

This study evaluates and investigates a collapsed retaining system constituted with anchored bored files, with the aim of presenting an example for the damages caused by the errors made in a project and construction phase. For determining the reasons for the collapse occurred in retaining system, field evaluations were implemented, calculations in the project were checked through and re-analyses...

Author(s): Devrim ALKAYA and Burak YEŞİL      

October 2011

Performance improvement for pipe breakage prediction modeling using regression method

In water distribution systems, the challenge was always to develop reliable models for predicting the failures for each individual pipe in their lifetime to keep the system reliable. The ability of predicting the pipe failure is one of the most important fundamentals for the effective rehabilitation strategy. Statistical methods are the most used techniques in this field. The prediction accuracy reflects the reliability...

Author(s): Abdelwahab M. Bubtiena, Ahmed H. ElShafie and Othman Jaafar      

October 2011

Variability of El Niño-Southern oscillation from 1880 to 2010 revealed by wavelet analysis

The El Niño-Southern oscillation (ENSO) is shown to have undergone significant changes in variance and coherency over the last 130 years. Wavelet analysis is applied to sea surface temperature anomalies (Niño3 SSTA) index to obtain frequencies of the temporal variations in the signal. This technique works in terms of specific events while allowing a researcher to keep an eye on the ensemble properties. By...

Author(s): Mahdi Haddad, Mohamed Faouzi Belbachir and Salem Kahlouche      

October 2011

Investigation of the effect of climatic adaptation on users’ thermal comfort requirement in outdoor space

With the increasing demand for leisure outdoor spaces, understanding the occupants’ thermal comfort requirement outdoors is an essential and forward-looking matter for designers to design more new attractive spaces. This paper presents the results of a long-term field comfort survey in shaded outdoor spaces, which primarily concerned with the comfort conditions of open spaces in cities. The database consists of...

Author(s): Ming-Jen Cheng, Jen-Hao Lo and Shang-Yuan Chen        

October 2011

Analysis of entropy generation in a variable viscosity fluid flow between two concentric pipes with a convective cooling at the surface

Entropy generation rate in a variable viscosity liquid flowing steadily through two concentric cylindrical pipes with convective cooling at the pipe surface, are studied using the second law analysis. The outer system is assumed to exchange heat with the ambient following Newton’s cooling law, and the fluid viscosity model varies as an inverse linear function of temperature. The resulting equations and the...

Author(s): M. S. Tshehla and O. D. Makinde      

October 2011

Modified Kudryashov method for generalized forms of the nonlinear heat conduction equation

An analytic study on the two generalized forms of the nonlinear heat conduction equations is presented in this paper. The modified Kudryashov method is employed to construct exact solitary wave solutions of these equations. The results reveal that the modified Kudryashov method is a powerful mathematical tool to solve nonlinear partial differential equations (NPDEs) in terms of accuracy and...

Author(s): M. M. Kabir    

October 2011

Comparison between the image qualities obtained with low energy high-resolution (LEHR) and LEGP collimators in single-photon emission computed tomography (SPECT) under implementation of different filters

The aim of a single-photon emission computed tomography (SPECT) filter is to use the sharpest filter/smooth combination consistent with getting quality images. Fourier filtering technique has been shown to greatly improve image quality in both the spatial and temporal domain. An optimal filter manipulates the image in such a way that the image quality is enhanced without losing the basic components of the...

Author(s): Alireza Sadrmomtaz      

October 2011

An augmented Lagrangian method of optimization problems with cone constraints

A deterministic global optimization algorithm based on augmented Lagrangian is proposed for solving the nonlinear programming with cone constraints, which is often encountered in technical design and operational research. At each outer iteration, the method requires the -global minimization of the augmented Lagrangian of problems with cone constraints, where. The convergence to an-global minimizer of the original...

Author(s): Wenling Zhao, Ranran Li and Jinchuan Zhou        

October 2011

A new support vector machine- genetic algorithm (SVM-GA) based method for stock market forecasting

Since analysis of time series is so hard to do, a support vector machine can be more proper for the purpose of forecasting in field of stock market. The support vector machine (SVM) can explore suitable knowledge from so vague data, which usually is necessary to interpret the financial data. But single SVM cannot achieve accurate results. Subsequently, in this paper a combinational intelligent strategy is presented. The...

Author(s): Vahid Khatibi, Elham Khatibi and Abdolreza Rasouli        

October 2011

Free vibration of symmetric angle-ply laminated cylindrical shells of variable thickness including shear deformation theory

Free vibrational study of symmetric angle-ply laminated cylindrical shells of variable thickness including first order shear deformation theory using spline function approximation is studied. The equations of motion for the cylindrical shells are derived using first order shear deformation theory. The solutions of displacement functions are assumed in a separable form to obtain a system of coupled differential equations...

Author(s): K. K. Viswanathan, Saira Javed, Zainal Abdul Aziz and I. Hossain      

October 2011

Interacting fading memory modified input estimation for maneuvering target tracking

The modified input estimation (MIE) has been introduced recently and it provides fast initial convergence rate as well as satisfactory tracking performance in low and medium maneuvering target cases. Unfortunately, it fails to track a high maneuvering target accurately due to modeling errors relating to the target acceleration dynamics. In this paper, an improvement on the MIE is proposed for maneuvering target...

Author(s): Li-ping Song and Hong-bing Ji        

October 2011

Soft ordered Abel-Grassman's groupoid (AG-groupoid)

In 1999, Molodtsov developed the theory of soft sets involving enough parameters, which is relatively free from complexities when dealing with uncertainties. Most of the applications of soft sets towards algebraic structures stress on associativity of the binary operations (e.g., semigroups, groups, modules and rings etc.). In this study, we aim to apply Molodtsov's notion of soft sets to a class of non-associative...

Author(s): Tariq Shah, Inayatur-Rehman and Asima Razzaque      

October 2011

A study of the optical properties of semi-organic crystals doped with erbium

Organic crystals have nonlinear optical effects (NLO) that make them attractive for applications in frequency conversion and optical processing. Among these we find the amino acids. glycine is the simplest of all amino acids in the crystalline form, has three different polymorphs a, b and g in which the molecules exist in the dipolar form (NH3+CH2COO-). In this work, we obtained glycine crystals...

Author(s): J. Parra Berumen, E. Orrantia Borunda, A. Duarte Moller and R. A. Silva Molina    

October 2011

Estimation of domestic and industrial emissions in Côte d’Ivoire (West Africa)

The domestic and industrial gaseous emissions are estimated in order to complete the high resolution inventory of biogenic and pyrogenic emissions performed over the Côte d’Ivoire (Ivory Coast). In this study, domestic emissions are estimated from the regional population density including rural or urban character, the amount of fuel (wood and charcoal) used per cape per year and emission factors. The...

Author(s): F. X. D. Bouo Bella, Y. Tchétché, P. Assamoi, J. K. Kouamé and S. Cautenet      

October 2011

Utilization of activated carbon produced from Sago hampas (Metroxylon sagu) to reduce ammonia loss from urea

Surface-applied urea contributes to NH3 loss of N through ammonia volatilization, especially in warm and humid regions. Ammonia loss has been a major problem confronting farmers because additional urea is applied to compensate for the loss which increases cost of fertilization. Activated carbon (AC) produced from Sago hampas (SH) could be capable of absorbing N in the form of NH4+ to minimize ammonia...

Author(s): Regis Bernard, Osumanu Haruna Ahmed and Nik Muhamad Ab Majid      

October 2011

Analysis of inorganic profile of Tribulus terrestris

Tribulus terrestris belonging to the family Zygophyllaceae, grows in tropical climates. T. terrestris is used in treating sexual deficiencies. It has been used in Asia and Europe for years to treat libido and infertility problems. People from around the world used T. terrestrisplant to promote overall health. T. terrestris has antimicrobial, anti-hypertension, diuretic, anti-actylcholine...

Author(s): Iqbal Hussain, Farhat Ali Khan, Naeem Khan, Murad Ali Khan, Hamayun Khan, Muhammad Khurram, Shan Zeb, RiazUllah and Majed Ahmad    

October 2011

Automatic disease diagnosis systems using pattern recognition based genetic algorithm and neural networks

This paper presented three disease diagnosis systems using pattern recognition based on genetic algorithm (GA) and neural networks. All systems dealt with feature selection and classification. GA chose subsets of features for the input of the classifier (neural network) and the accuracy of the classifier determined the percentage of effectiveness of each subset of features. The classifiers using in this paper were...

Author(s): Mahdieh Adeli and Hassan Zarabadipour        

October 2011

An evaluation of Iranian banking system credit risk: Neural network and logistic regression approach

The current study seeks to provide a new solution for evaluation of banking system customers risk by integrating different scientific methodology. Evaluation of banking system customers risk in Iranian banks relies on experts judgment and fingertip rule. This type of evaluation resulted in high rate of postponed claims; therefore, designing new intelligent model for credit risk evaluation will be helpful, thus in this...

Author(s): Mahdi Salehi and Ali Mansoury