International Journal of
Physical Sciences

  • Abbreviation: Int. J. Phys. Sci.
  • Language: English
  • ISSN: 1992-1950
  • DOI: 10.5897/IJPS
  • Start Year: 2006
  • Published Articles: 2556

Table of Content: 16 September; 6(19)

September 2011

A critical review of parallel distributed computing and the Lyapunov criterion for multiple time-delay fuzzy systems

This work reviews some important Lyapunov criterion results based on which we address the stability problems of multiple time-delay Takagi-Sugeno (T-S) fuzzy systems. A delay-dependent stability criterion is derived using the fuzzy Lyapunov method that will ensure the asymptotic stability of the multiple time-delay T-S fuzzy systems. Furthermore, the parallel distributed compensation (PDC) scheme is used to achieve a...

Author(s): Cheng-Wu Chen    

September 2011

A new approach for interval type-2 by using adaptive network based fuzzy inference system

In this paper, adaptive network based fuzzy inference system (ANFIS) was used in control applications of different type nonlinear systems as interval type-2 fuzzy logic controller (IT-2FL). Two adaptive network based fuzzy inference systems were chosen to design type-2 fuzzy logic controllers for each control applications. Membership functions in interval type-2 fuzzy logic controllers were set as an area called...

Author(s): Mustafa TINKIR      

September 2011

Thermal insulation and physical properties of particleboards from pineapple leaves

The aims of this research were to study the production processes and properties of thermal insulation produced from pineapple leaves using natural rubber latex as a binder. Thermal insulation boards were made by spraying the pretreated natural rubber latex onto pineapple fiber to form a squared thermal insulation with the size of 20 and 1.5 cm thickness.  Test results on thermal and physical properties showed that...

Author(s): S. Tangjuank    

September 2011

Capability measures for Weibull processes with mean shift based on Erto’s-Weibull control chart

Process capability indices (PCIs), which are effective tools for quality assurance and are guidance for process improvement, have been proposed in the manufacturing industry to provide numerical measures on process reproduction capability. PCIs are calculated under the assumption that the process is stable while the process mean and variation are not changeable. However, in practice, the process is dynamic. Under the...

Author(s): Ya-Chen Hsu, W. L. Pearn and Chun-Seng Lu        

September 2011

Self-managing defense against SYN-flooding attacks

SYN-flooding attack uses the weakness available in TCP’s three-way handshake process to keep it from handling legitimate requests. This attack causes the victim host to populate its backlog queue with forged TCP connections. In other words it increases PSA (probability of success of attack) and decreases BUE (buffer utilization efficiency) in the victim host and results to decreased performance of the host. This...

Author(s): Gholam Shaker and Shahram Jamali        

September 2011

Investigation of induction motor parameter identification using particle swarm optimization-based RBF neural network (PSO-RBFNN)

High dynamic performance of induction motor drives is required for accurate system information. From the actual parameters, it is possible to design high performance induction motor drive controllers. In this paper, improving the induction motor performance using intelligent parameter identification was proposed. First, machine model parameters were presented by a set of time-varying differential equations. Second,...

Author(s): Hassan Farhan Rashag, S. P. Koh, S. K. Tiong, K. H. Chong and Ahmed N. Abdalla        

September 2011

Quantum hybrid genetic algorithm based on simulated annealing and its application

Quantum genetic algorithm (QGA) is firstly improved for numerical optimization with real coding, where populations are updated by a simple rotation method which inspires a real quantum genetic algorithm (RQGA), then simulated annealing (SA) is reasonably introduced in the optimizing process of RQGA, and a hybrid quantum genetic algorithm (HQGA) is presented, which could not only effectively avoid the premature...

Author(s): Airong Nie    

September 2011

Correlation of UV irradiation-induced wettability characteristics by factorial design of experiments on Ti6Al4V

Biomimetic surface roughness and UV irradiation time will greatly affect their use of hydrophilic and hydrophobic surface of biological material, and then in turn affect cell adhesion, cell growth quality. Therefore, the main purpose of this study in different surface modification treatments on Ti6Al4V discs which around irradiation with UV light influence the wettability on the material surface. Then, Factorial design...

Author(s): Ching-Cheng Wang and Yi-Hsien Huang        

September 2011

Computerized nuchal translucency three dimensional reconstruction, visualization and measurement for trisomy 21 prenatal early assessment

Conventionally, measurement of ultrasonic marker, nuchal translucency or NT is accomplished by manual assessment in two dimensional ultrasound images for trisomy 21 early detection. Nonetheless, the efficiency of 2D measurement depends heavily on the image position and any deviation will prompt inaccurate measurement. Therefore, in this paper we proposed the reconstruction, visualization and measurement of nuchal...

Author(s): Lai Khin Wee, Hum Yan Chai and Eko Supriyanto        

September 2011

Sensitivity analysis of slopes affected by possible earthquake loading and heavy rainfall: Case study

The effect of seismic loading on slope failure is studied both experimentally and analytically to establish the spatial and temporal process of failure initiation and propagation during possible earthquake loading or heavy rainfall. For such purpose different limit equilibrium modeling were carried out and factor of safeties against sliding caused by both excess earthquake loading and heavy rainfall were found. As for...

Author(s): Bujang B. K. Huat, Hossein Moayedi, Afshin Asadi, Sina Kazemian and Hamed A. Keykha        

September 2011

A hybrid Ant algorithm for the set covering problem

Set covering problem is the model for many important industrial applications. In this paper, we solve some benchmarks of this problem with ant colony optimization algorithms using a new transition rule. A look-ahead mechanism was incorporated to check constraint consistency in ant computing. Computational results are presented showing the advantages to use this additional mechanism to ant system and ant colony...

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

September 2011

Statistical evaluation of wind speed and energy potential for the construction of a power plant in Baladeh, Nur, Northern Iran

Renewable energy does not pollute the environment and it has an endless and free primary source and save fossil fuel reserves for future generations. Finding and confirming the appropriate potential areas for installing wind turbines is the first and the most important step for constructing wind power plants. Hence, installing a standard anemometer station and checking wind flow regime is essential. In...

Author(s): Gholamreza Janbaz Ghobadi, Bahram Gholizadeh and Bagher Soltani

September 2011

An analysis on the application of PID controller in the frequency contribution of gas turbine power plant

Conventionally, frequency correction is made by water turbine power plants. This paper addresses the role of the gas turbine power plants in frequency correction within the power networks. It gives those conditions that are necessary for a gas turbine power plant that attends in frequency correction task. It studies the functional behavior of the governor system by using extensive simulations in MATLAB environment and...

Author(s): Behnam Jamshidzadeh and Shahram Jamali        

September 2011

The worst case upper bounds in #3-SAT with the number of clauses as the parameter

The rigorous theoretical analyses of algorithms for #SAT problem had been proposed in recent years. However, as far as we know, all algorithms for solving #SAT had been analyzed using the number of variables as parameter. In this paper, an algorithm for #3-SAT with rigorous complexity analyses using the number of clauses as parameter was presented. By analyzing the algorithm, the worst-case upper...

Author(s): Zhou Junping, Ma Zhiqiang and Yin Minghao        

September 2011

Effect of soil water retention model on slope stability analysis

Understanding of the relationship between volumetric water content (q) and soil capillary pressure (ψ), and between unsaturated hydraulic conductivity K and ψ is important in the analysis of rainwater infiltration into soil and its effect to slope stability. These relationships are known as the water retention curve and the hydraulic conductivity function, respectively. Much soil water...

Author(s): Muhammad Mukhlisin, Marlin Ramadhan Baidillah, Mohd. Raihan Taha andAhmed El-Shafie        

September 2011

The role of global warming in the reservoir storage drop at Kainji dam in Nigeria

Statistical analysis of hydrometeorological data (temperature, relative humidity, rainfall, reservoir inflow, reservoir storage and turbine release) at Kainji dam was done with the aim of detecting trends.  The non parametric Man-Kendall test was used to detect monotonic trends.  The Sen’s slope estimator and regression analysis were used to develop models for the variables.  A Man-Kendall statistic...

Author(s): Oluwatosin Olofintoye and Josiah Adeyemo        

September 2011

Effects of friction stir welding process parameters on appearance and strength of polypropylene composite welds

Friction stir welding is a solid-state joining process that has gained acceptable progress in recent years. This method which was first used for welding of aluminum and its alloys is now employed for welding of other materials such as polymers and composites. In this article, friction stir welding has been used for butt joining polypropylene composite plates having 30% glass fiber by weight. The effects of important...

Author(s): G. H. Payganeh, N. B. Mostafa Arab, Y. Dadgar Asl, F. A. Ghasemi and M. Saeidi Boroujeni            

September 2011

Hub location selection of third-party logistics service on multiple countries consolidations for ocean freight forwarders by using fuzzy multiple criteria decision-making (MCDM) approach

Since a good location will effectively help expand agglomeration economy effects and increase competitive advantages, there is a need to proceed with a study on effects from various perspectives and evaluate proper location objectively. Hence, the main purpose of this paper is to use a fuzzy multiple criteria decision-making (MCDM) approach to select a hub location of third-party logistics service on multiple countries...

Author(s): Tzay-An Shiau, Li-Mei Lin, Ji-Feng Ding and Chien-Chang Chou        

September 2011

Quantum mechanical disclosure of the classical adiabatic constancy of pvg for both an ideal and a photon gas

In our recent paper (Yarman et al., 2010), we established a connection between the macroscopic adiabatic transformation law (Pressure ´ Volume5/3= Constant) of an ideal gas and the quantum mechanical description of its molecules. This connection was unique in embodying just the Planck contant and quantum numbers, instead of the classical temperature quantity and Boltzmann constant. It was...

Author(s): Tolga Yarman, Alexander L. Kholmetskii and Metin Arik        

September 2011

Investigation of discrepancies of some geoids determined using various methods for Turkey

In this study, the causes and size of discrepancies between various geoid models were investigated. Local geoid models (Turkish Geoid-1991, Turkish GPS/Leveling Geoid, Updated Turkish Geoid-1999, Turkish Geoid-2003, Turkish Hybrid Geoid Model-2009)  and global geoid models (EIGEN-GL04C, EIGEN-GL04S1, EIGEN-5C) were used in Turkey. Thirty different points were selected in Turkey. The geoid heights of the points in...

Author(s): Nazan Yilmaz and Celalettin Karaali        

September 2011

An investigation of carburization resistance performance of ethylene furnace tube alloys

Carburization tests and analysis were performed on some samples of radiant tube alloys of ethylene furnaces at three petrochemical plants. These tubes had undergone carburization in service with some losing their structural integrity. This study evaluates and compares the carburization resistance performances of some of these tubes in service and identifies the cause of their degradation. The polished surfaces of the...

Author(s): Loto, C. A., Loto, R. T. and Popoola, A. P. I.