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: 9 March, 2012; 7(11)

March 2012

A study on the deconfined degree of freedom (g1) and the running coupling constant ()

  The quark-gluon plasma is a novel state of matter in which quarks are no longer confined to bound states such as baryons and mesons. the freezing of quark–gluon deconfined degrees of freedom is the essential ingredient in determining the conditions in a transition between phases that has time to develop into equilibrium. The degree of freedom in the confined hadronic matter phase and...

Author(s): A. G. Shalaby

March 2012

Nonlinear dynamic analysis and chaos control for third order sub-harmonic in a ferroresonant circuit

  In this paper, the nonlinear dynamics of a non-autonomous system model for third order sub-harmonic in a basic ferroresonant circuit are analyzed in details, including phase trajectory, Poincaré map, bifurcation diagram, dissipativity analysis and Spectrogram map. Furthermore, a sliding mode controller of the system is designed and both theory analysis and numerical simulation are presented,...

Author(s): Yanping Wu and Guodong Wang

March 2012

Micro and nano thermal flow characteristics of a flat plate heat pipe heat spreader

  The present study investigates the characteristics and heat transfer performance of a flat heat pipe (FHP) heat spreader with various wick structures. A flat heat pipe heat spreader exemplifies successful heat transfer applications for highly efficient devices in space, energy technology, electronics cooling etc. The present experimental and simulation results reveal the heat transfer characteristics of a...

Author(s): In Seon Yu, Seok Ho Rhi and Kyoung Il Cha

March 2012

Study of high power light emitting diode (LED) lighting system in accelerating the growth rate of Lactuca sativa for indoor cultivation

  The experimental study of indoor cultivation using high power light emitting diode (LED) lighting system to accelerate the growth rate of Lactuca sativa plant is presented in this article. A novel high power LED lighting system with the use of aluminum indium gallium phosphide (AlInGaP) and indium gallium nitrate (InGaN) LEDs to produce photosynthetically active radiation (PAR) light source required...

Author(s): Le-Yan Chin and Kok-Keong Chong

March 2012

Development of 0.5 HP induction motor with reduced slots in rotor and stator core and its performance evaluation

  In this paper, we have developed a new prototype of 0.5 hp induction motor with reduced slots in rotor bar and stator core in comparison to the conventional induction motor. The conventional induction motor usually uses 30 slots of aluminum rotor bar and 36 slots in the stator core. In our developed prototype, we used 10 slots of copper rotor bar and 24 slots in the stator core. In order to evaluate the...

Author(s): I. Daut, K. Anayet, N. Gomesh, M. Irwan, M. Asri and M. A. Rashid

March 2012

Rheological and electrokinetic properties of carboxymethylcellulose-water dispersions in the presence of salts

    The purpose of this work is to investigate the effect of the addition of salts in the form of calcium chloride, sodium chloride and potassium chloride on the rheological and electrokinetic properties of diluted sodium carboxymethylcellulose (Na-CMC) dispersions (0.50%). The rheological data of a water-CMC-salt system were obtained using coaxial cylinder viscometer covering a wide range of shear...

Author(s): Benyounes Khaled, and Benmounah Abdelbaki

March 2012

Certain subclasses of analytic functions

  The aim of present paper is to define certain subclasses of analytic functions in connection with the convolution operator. Moreover, some inclusion relationships, radii problems and a sharp coefficient bound have been successfully derived. These innovations are of extreme importance for a wide range of physical problems. Results are very encouraging.   Key words: Bounded boundary and...

Author(s): Muhammad Arif, Saqib Hussain and Syed Tauseef Mohyud-Din

March 2012

Weighted pseudo almost periodic solutions for differential equations involving reflection of the argument

  By means of the fixed point methods and the properties of the weighted pseudo almost periodic functions, the existence and uniqueness of weighted pseudo almost periodic solutions are obtained for differential equations involving reflection of the argument.   Key words: Almost periodic functions, weighted pseudo almost periodic functions, fixed point methods, differential equations,...

Author(s): Na Xin and Daxiong Piao

March 2012

Design of fuzzy algorithms locomotion for six legged walking robot

  One of the most relevant topics in the design of legged robots is to perform movements. The aim of this article is to present a set of algorithms that allow a six-legged walking robot to achieve the mobility of its different legs among irregular or no established actions, this gait is known as: free locomotion. The development of these algorithms using fuzzy logic allows the system to have a redundant...

Author(s): Emilio Vargas-Soto, Efren Gorrostieta, Artemio Sotomayor-Olmedo, Juan-Manuel Ramos-Arreguin and Saul Tovar-Arriaga

March 2012

Morphology and properties of radio frequency (RF) sputtered cobalt thin films

  Cobalt (Co) films prepared by radio frequency (RF) sputtering for 5 to 55 min were studied by atomic force microscopy (AFM) and vibrating sample magnetometry. The root mean square surface roughness quantified from 1 ´ 1 µm2 AFM images tended to increase with increasing sputtering time above 20 min. Compared to hysteresis loops in the case of perpendicular magnetic field, the ferromagnetic Co...

Author(s): T. Chanthong, W. Rattanasakulthong, C. Sirisathitkul and S. Pinitsoontorn

March 2012

Investigation of channel shear connectors for composite concrete and steel T-beam

  This paper evaluates the behavior of channel shear connectors, embedded in a concrete slab, with different concrete materials. The results of a series of limited push-out specimens were presented and discussed. The push-out tests comprise of channel shear connectors in different types of concrete. Reinforcement was included in some specimens, as well. The results showed that using reinforcements in concrete...

Author(s): Ali Shariati, N. H. Ramli Sulong, Meldi Suhatril and Mahdi Shariati

March 2012

Porous and non-porous electrospun fibres from discarded expanded polystyrene

  In this study, we report the electrospinning of expanded polystyrene (E-PS) in xylene and tetrahydrofuran to produce microfibres. The aim is to develop a viable technique for waste polystyrene electrospun fibers for various applications. The E-PS was dissolved in xylene and tetrahydrofuran (THF), spun at voltage range of 10 to 28 kV keeping the spinning distance constant. The E-PS was characterized with...

Author(s): Oluwagbemiga Alayande, Samuel Olatubosun, Oluwaseun Adedoyin, Olalekan Deborah, ,Olayinka Sanda , Adeniyi Fasasi, Olugbenga Dare, Gabriel Osinkolu, John Ajao and David Pelemo

March 2012

Effect of Twist Drill Bit and Feeding Speed on Air Dust During Boring Process of Solid Wood and Wood-Based Composite Panels

  A study was carried out to analyze the particles produced during drilling process with twist drills with one and two spirals (length 70 mm, diameter 8 mm) with different feeding speeds, executed in beech (Fagus sylvatica), pine (Pinus sylvestris) and oak (Quercus petraea) woods, and also, medium density fiberboard (MDF), particleboard and poplar plywood panels. Drilling of solid woods was performed by...

Author(s): Holta COTA, Dritan AJDINAJ, Entela LATO, Zeki CANDAN, Doklea QUKU, Agron BAJRAKTARI and Süleyman KORKUT

March 2012

Multilevel input signal for multivariable state-space identification of wastewater treatment plant

  The purpose of this work is to identify a linear time-invariant dynamic model of wastewater treatment plants with multilevel pseudo random signals as an excitation input. The plants naturally aim to remove suspended substances, organic material and phosphate. An activated sludge process becomes the best technology available to control the discharge of pollutants. For this purpose, state-space models that...

Author(s): Sharatul Izah Samsudin, Mohd Fua’ad Rahmat, Norhaliza Abdul Wahab, Muhamad Sani Gaya and Irma Wani Jamaludin

March 2012

Analysis of noise levels in corrugated board factories

  Increasing demand for goods due to population growth, national and international competition and developing technology result in intensive machine usage. Increasing usage of machinery may cause noise pollution in our environment and may adversely affect employees, leading to physiological and psychological problems. Recently, national and international environmental regulations have become widespread, due to...

Author(s): Hasan Serin

March 2012

Rule based fuzzy logic (FL) time series prediction

  The singleton and non-singleton type-1 back propagation (BP) designed sixteen rule fuzzy logic system (FLS) on hourly averaged wind data for the years 1985 to 2004 are studied. The BP designed 16 rule non-singleton-type-1 FLS was found relatively a better forecaster than singleton-type-1. There are too many hidden or unraveled uncertainties, such as non-stationarity and stable attractors. These uncertainties...

Author(s): Yasmin Zahra Jafri, Lalarukh Kamal, Amir Waseem and S. Masood Raza

March 2012

Prevalence of iron deficiency in adult population: A case study from Khyber Pakhtunkhwa (KPK), Pakistan

  Iron deficiency (ID) is the most common cause of nutritional anaemia in world and it is recognized as a major public health problem throughout the globe, especially in the developing countries. Infants, young children and pregnant women are most frequently affected by iron deficiency, which is the most commonly form of nutritional deficiency. The aim of present study was to determine iron deficiency anaemia...

Author(s): Mohammad Ilyas Mahmood Qureshi, Shujaat Ali Khan, Kalsoom Farzana, Ghulam Murtaza, Saira Azhar, Sobia Noreen, Syed Tauqir Ali Sherazi, Amara Mumtaz, Syed Haider Shah, Abdul Malik, Nisar Ali, Rehmana Rasheed, Rabia Razzaq and Muhammad Hassham Hassan Bin Asad