International Journal of
Physical Sciences

  • Abbreviation: Int. J. Phys. Sci.
  • Language: English
  • ISSN: 1992-1950
  • DOI: 10.5897/IJPS
  • Start Year: 2006
  • Published Articles: 2542

IJPS Articles

A supplement to the Michelson-Morley experiment

October 2013

Based on the great Michelson-Morley experiment and predecessors’ analyses, this famous experiment was reviewed under the principle that velocity of light is independent of the motion of the light source emitting or reflecting it, mainly on time difference or optical path difference (OPD). We will discover in this work that predecessors’ analysis on the famous experiment may be improper, and that there is no...

Author(s): Lewin Lee

Solution and dynamics of a fourth rational difference equation

October 2013

In this paper, we get the form of the solutions of the following nonlinear recursive sequences of order four  where the initial conditionsare arbitrary real numbers. Also, we study some qualitative behaviors of the solutions as periodicity character of the solutions of these different equations and we obtain the equlibrium points of considered difference equations in order to investigate the local...

Author(s): E. M. Elsayed

Vibration reduction and stability study of a dynamical system under multi-excitation forces via active absorber

October 2013

An active vibration absorber for suppressing the vibration of the nonlinear system when subjected to external and parametric excitations forces will be studied. The aim of this paper is to study the effect of the nonlinear controller on the vibrating system. The approximate solutions up to the second order are derived using the method of multiple scale perturbation technique near the primary, principal parametric...

Author(s): E. E. El Behady and E. R. El-Zahar

Electrical, structural and thermal properties of graphite/silicone blends

October 2013

We report the results of electrical, structural and thermal investigations on graphite/Silicone blends (G/Silicone), obtained by dispersion of graphite powder in an insulating matrix of rubber silicone. The X-ray diffraction analysis showed crystalline structure for our all studied (G/Silicone) blends. Conductivity measurements were reported in the temperature range of 298 to 423 K. The blends showed percolation...

Author(s): Aymen MannaÏŠ, Fethi Gmati, Sami SaÏŠdi and Abdellatif Belhadj Mohamed

Seismic refraction and resistivity imaging for assessment of groundwater seepage under a Dam site, Southwest of Saudi Arabia

October 2013

Seismic refraction and resistivity imaging methods were used to investigate a Dam site in Southwest Saudi Arabia to delineate the source and pathway of groundwater seepage in the site. The selected methods have the possibility to give an image of the subsurface and map lateral and vertical variations in the subsurface geology of the site. For this purpose, 48-channels seismograph with geophone spacing of 5 m,...

Author(s): Sayed S. R. Moustafa, Elkhedr H. Ibrahim, Eslam Elawadi, Mohamed Metwaly,and Naser Al Agami

Role of Rose Bengal-Mannitol system for generation of electrical energy in photogalvanic cell

September 2013

Photogalvanic effect was studied in photogalvanic cells containing Rose Bengal as dyes and Mannitol as reductants. The photogalvanic cells were determined by the photo potential, photocurrent, conversion efficiency, power of cell and performance of cell. The effects of various parameters like pH, light intensity, diffusion length, reductant concentration and dye concentration on the electrical output of the cell is...

Author(s): Mahesh Chandra, Anoop Singh and R. C. Meena

A nonlocal integral boundary value problem of nonlinear integro-differential equations of fractional order

September 2013

This study discussed the existence of solutions for a nonlinear fractional integro-differential equation of order  with four-point nonlocal integral boundary conditions. The given problem is transformed to an equivalent fixed point problem in terms of an operator equation. Then, by means of Banach contraction principle and a fixed point theorem due to Krasnoselskii, the existence results are obtained. The last...

Author(s): Bashir Ahmad, Ahmed Alsaedi and Safa Alsulami

Earthquake precursory studies at Amritsar Punjab, India using radon measurement techniques

September 2013

The continuous soil gas radon and daily monitoring of radon concentration in water is carried out at Amritsar (Punjab, India), a well known seismic zone to study the correlation of radon anomalies in relation to seismic activities in the study area. In this study, radon monitoring in soil was carried out by using barasol probe (BMC2) manufactured by Algade France whereas the radon content in water was recorded using...

Author(s): Arvind Kumar, Vivek Walia, Surinder Singh, Bikramjit Singh Bajwa, Sandeep Mahajan, Sunil Dhar and Tsanyao Frank Yang

A new approach on production of slope map using autonomous Unmanned aerial vehicle

September 2013

Many studies have been done previously to generate a slope map at the area of interest. However, most of these methods can be time consuming and they require huge cost. Currently, aerial mapping using Unmanned aerial vehicle (UAV) is very popular in the mapping field. UAV can promise a high accuracy data with low cost and less time needed to produce a slope map at certain area. Therefore, a scientific approach needs to...

Author(s): Khairul Nizam Tahar, Anuar Ahmad, Wan Abdul Aziz Wan Mohd Akib and Wan Mohd Naim Wan Mohd

A multilevel fast multiple method for computing the propagation of multiply scattered 2.5-D teleseismic surface waves underneath a linear or quasi-linear seismic station array

September 2013

We introduce an algorithm for the forward modeling of multiple scattering of teleseismic surface waves where the underground structure beneath the linear (or quasi-linear) seismic station array is assumed two-dimensional and the teleseismic surface waves may be approached from an arbitrary direction. The current algorithm is two-and-half-dimensional since even though the structure is two-dimensional, the displacements...

Author(s): Özcan Çakir

Coupled-operations model and a conditional differential evolution algorithm for improving reservoir management

September 2013

This paper proposes a flexible methodology for finding the optimal control of reservoir operations, which is adopted for simulating a storage system including a large reservoir simulation model and a numerical search method for searching decision variables. The optimization model used was a conditional differential evolution algorithm (CDE). The model was connected to reservoir simulation model for searching the...

Author(s): Rattana Hormwichian, Anongrit Kangrang, Alongkorn Lamom, Chavalit Chaleeraktrakoon and Sanguan Patamatamkul

A note on dynamical systems satisfying the Wünschmann-type condition

September 2013

Dynamical systems of second order ordinary differential equations (SODEs) satisfying the Wünschmann-type condition are presented, with a special emphasis on SODEs provided by Euler-Lagrange equations, particularly, geodesics on surfaces. Some remarkable facts are to be pointed: three of our examples are of quasi Euler-Lagrange nature; also, except one example that leads to classical Euclidean 2D metric, all yields...

Author(s): Mircea Crăşmăreanu and Vlad Enache

Numerical and experimental evaluation of bearing capacity factor Nγ of strip footing on sand slopes

September 2013

Results of laboratory model tests and numerical studies on the behavior of a strip footing adjacent to a sand slope are investigated and presented in this paper. The investigated parameters include the effects of depth of the first reinforcement layer, vertical spacing, number of reinforcement layers, and distance between the edges of footings on bearing capacity. Results were analyzed to determine the effects of each...

Author(s):   Mohd Raihan Taha and Enas B. Altalhe

Determination of the vertical variations in temperature and longwave radiation within the gray Earth’s troposphere using radiative equilibrium profile model

September 2013

This study estimated the vertical variation in mean temperatures within the tropospheric layer using the radiative equilibrium profile model and longwave radiation with Stefan-Boltzmann equation at a tropical meteorological station located besides Physics Building (7.55°N:4.56°E), Obafemi Awolowo University, Ile-Ife, Nigeria. In the model, the height of the troposphere was assumed to be...

Author(s): Mudasiru A. Olajire and Olaniran J. Matthew

Magneto hydrodynamic (MHD) squeezing flow of a Casson fluid between parallel disks

September 2013

Squeezing flow of a Casson fluid is considered between two parallel disks. Upper disk is taken to be impermeable but capable of moving towards or away from the lower fixed and porous disk. Governing equations are derived with the help of conservation laws combined with suitable similarity transforms. Homotopy analysis method (HAM) is then been employed to determine the solution to resulting ordinary differential...

Author(s): Naveed Ahmed, Umar Khan, Sheikh Irfanullah Khan, Yang Xiao-Jun, Zulfiqar Ali Zaidi, and Syed Tauseef Mohyud-Din

Excessive correlated shifts in pH within distal solutions sharing phase-uncoupled angular accelerating magnetic fields: Macro-entanglement and information transfer

September 2013

Entanglement or “excess correlation” between physical chemical reactions separated by significant distances has both theoretical and practical implications. In 24 experiments, the inverse shifts in pH were noted in two quantities of spring water separated by 10 m that shared rotating magnetic fields (0.5 µT) with changing angular velocities when one solution was injected with proton donors (weak acetic...

Author(s): Blake T. Dotta, Nirosha J. Murugan, Lukasz M. Karbowski and Michael A. Persinger

Comparison of selected physical properties of deep peat within different ages of oil palm plantation

September 2013

The environment of young and mature oil palm plantation were found to be different due to the size of the oil palms and the depth of water tables applied. The environments in both sites have probably influenced the changes of peat soil physical properties towards the peat land degradation. A study was carried out to compare selected physical properties of deep peat between two different ages of oil palm plantation...

Author(s):

Synthesis and use of hydrotalcites as heat stabilisers in thermally processed powdered polyvinylchloride (PVC)

September 2013

Lead-based stabilisers, such as lead sulphate and lead stearate, currently used in the processing of polyvinylchloride (PVC) products are being substituted with more environmentally safe, economically viable and higher quality materials. This study aimed to use hydrotalcites (HTs), which are environmentally non-hazardous and simple to synthesise, to effectively quench the HCl gas evolved during the degradation of PVC....

Author(s): A. Bissessur and M. Naicker

Motion groups and circular helices in Lorentz 3-space

September 2013

In this paper, we find the curves which are orbits of points under the homothetic and helicoidal motion groups in Lorentz 3-space. Also, we show that if these curves are Frenet curves then their curvature and torsion are constant. So we can say that these curves are circular helix in Lorentz 3-space.   Key words: Helix, homothetic motion groups, helicoidal motion groups, Frenet curves.

Author(s): Esma Demir and Yusuf Yayli

Geoelectrical studies for the delineation of potential groundwater zones at Oduma in Enugu State, Southeastern Nigeria

September 2013

This work evaluates the use of geoelectrical method in the delineation of potential groundwater zones at Oduma in Enugu state, Southeastern Nigeria. Oduma lies within latitudes 6°02Ë¡ N to 6°07Ë¡ N and longitudes 7°35Ë¡ E to 7°41Ë¡ E with an area extent of about 102.6 km2. The area is underlain by Awgu Shale group with its lateral arenaceous facie; Owelli Sandstone outcropping south...

Author(s): Austin, C. OKONKWO and Isaac, I. UJAM

Performance analysis of a Ĉuk regulator applying variable switching frequency

September 2013

This paper examines the performance of Ĉuk regulator to convert three phase alternating current (ac) to direct current (dc). Firstly, three phase ac is rectified with bridge diode. The rectified dc voltage is applied to input of a Ĉuk regulator.  Three phase harmonics filter is introduced at the input of the diode rectifier to improve the shape of the input current. The main technique applied here to improve the...

Author(s): Md. Nazmul Hasan, Md. Shamimul Haque Choudhury, M. Shafiul Alam, and Muhammad Athar Uddin,

Wavelet based dynamic Mel Frequency Cepstral Coefficients (MFCC) and block truncation techniques for efficient speaker identification under narrowband noise conditions

September 2013

Speaker identification strategies are well convincing in their performance when clean speeches are scrutinized. But the performance degrades when speech samples are corrupted by narrowband noise. Block truncation of the cepstral coefficients ensures that not all the features are affected by narrowband noise but it cannot reduce the extent of degradation. This work is focused towards improving the performance of speaker...

Author(s): S. Selva Nidhyananthan, R. Shantha Selva Kumara and D. S. Roland

Plasma properties of nano-second laser ablated iron target in air

September 2013

In the present work, we studied the optical emission spectra of iron (Fe) plasma produced by the fundamental (1064 nm) and second (532 nm) wavelengths of an Nd: YAG laser. The plasma emission has been recorded spatially using five spectrometers covering the spectral region from 200 to 720 nm. The laser beam was focused on target material by placing it in air at atmospheric pressure. The experimentally observed line...

Author(s): Muhammad Salik, Muhammad Hanif , Jiasheng Wang and Xiqing Zhang

Second-order kinetic model for the adsorption of divalent metal ions on Sida acuta leaves

September 2013

The removal of metal ions from effluents is of importance to many countries of the world both environmentally and for water re-use. A comparison was made of the linear least-squares method of the widely used pseudo-second order kinetic model for the sorption of some divalent metal ions onto Sida acuta leaves. Four pseudo-second order kinetic linear equations were used for this study. The results obtained from...

Author(s): Oboh I. O., Aluyor E. O. and Audu T. O. K.

Structural health monitoring and damage assessment Part I: A critical review of approaches and methods

September 2013

Aging and deterioration of existing structures and the need for rapid assessment and evaluation of these structures for hazard mitigation have significantly expanded the research efforts in the field of structural health monitoring (SHM). SHM involves monitoring of a structure using periodically sampled measurements, extraction of damage sensitive features from these measurements, and assessment of the current health...

Author(s): Burcu Gunes and Oguz Gunes

Singulo oscillatory – stiff rational integrators

September 2013

In this paper, we derive a general singulo oscillatory – stiff rational integrator of order (S+3) for s = 0, 1, 2, 3, 4,… for the solution of initial value problems in ordinary differential systems that are singular, oscillatory or stiff. We compared our integrators with certain maximum order second derivative hybrid multi-step methods, certain Tau and Euler methods, the adaptive implicit and classical...

Author(s): Elakhe O. A. and Aashikpelokhai U. S. U.

Effect of dielectric constant on energy losses in lead sulphide thin films grown by solution method at room temperature

September 2013

Thin films of lead sulphide (PbS) were deposited using chemical bath deposition (CBD) at different lead ion concentrations. A mixture of  sodium hydroxide, varied concentrations of lead nitrate, triethanolamine (TEA), ammonia solution, thiourea, di-ionized and distilled water were used. A dip time of 120 min and pH of 9 at room temperature were maintained. It was found out that dielectric constants of the films...

Author(s): Mosiori, Cliff Orori

Influence of fuel in the microwave assisted combustion synthesis of nano α-alumina powder

September 2013

Microwave assisted combustion synthesis is used for fast and controlled processing of advanced ceramics. Single phase and sinter active nano crystalline alpha alumina powders were successfully synthesized by different fuel-to-oxidant molar ratios using aluminium nitrate as an oxidiser, glycine as a reducing agents and millipore water as a solvent by microwave assisted combustion synthesis. Thermodynamic modelling of the...

Author(s): Ramesh G., Mangalaraja R. V., Ananthakumar S. and Manohar P.

Almost quaternionic integral submanifolds and totally umbilic integral submanifolds

August 2013

In this work, we consider a Riemannian manifold which admits an integrable distribution  with an almost quaternionic structure V. We show that the torsion tensor of an almost quaternionic structure  is independent of the choice of bases. We prove that the integral submanifolds are totally umbilic under the condition of the conjugate shape operator is skew-adjoint. We give another condition...

Author(s): Fatma Özdemir

Synthesis and characterization of nano-hydroxyapatite (n-HAP) using the wet chemical technique

August 2013

Hydroxyapatite nanoparticles were synthesized, using a wet chemical technique with diammonium hydrogen phosphate and calcium nitrate tetrahydrate precursors, respectively. The pH of the system was maintained at 10.8 throughout the stirring process, by using 0.1 M sodium hydroxide. The mixture was allowed to remain stirred overnight and a white precipitate was formed. The precipitate was vacuum dried and cleaned with...

Author(s): Arunseshan Chandrasekar, Suresh Sagadevan and Arivuoli Dakshnamoorthy

Multiband fractal based reconfigurable antenna with introduction of RF MEMS switches for next generation devices

August 2013

Next generation network’s main requirements are compact size and also support to heterogeneous network. Fractal antennas have useful applications in cellular telephone and microwave communications. Video conferencing, streaming video are main applications that are included in next generation networks and requirements for these applications are high data rates require to have high bandwidth. But as size of antenna...

Author(s): Paras Chawla and Rajesh Khanna

Effect of stabilizers on stiffness modulus of soil layers: A review

August 2013

Subgrade layer has a significant contribution in the pavement structure, and the quality of this layer has a great impact on the subsequent pavement design. Pavement design guide as specified in the AASHTO (2002), incorporates engineering properties of unbound and stabilized subgrade soils, since in many cases fatigue or rutting failure in pavements are due to insufficient stiffness modulus in soil layers. Subgrade...

Author(s): Dariush Moazami, Zainuddin Md. Yusoff, Ratnasamy Muniandy and Hussain Hamid

Synthesis and characterization of polyindole with liquid crystalline azobenzene as side chains

August 2013

In this study, a series of azobenzene-functionalized liquid crystalline (LC) polyindole derivatives: poly{2-[N-ethyl-N-[4-[4'-(nitrophenyl)azo]phenyl]amino]ethyl-3-indolyl acetate}, poly(In3AA-RedI), poly{2-[N-ethyl-N-[4-[4'-(nitrophenyl)azo]phenyl]amino]ethyl-3-indolyl acetate-co-indole}, poly(In3AA-RedI-co-In), poly{2-[N-ethyl-N-[4-[4'-(nitrophenyl)azo]phenyl] amino]ethyl-3-indolyl...

Author(s): Seyed Hossein Hosseini and Maryam Ashjari

Structural and DC Ionic conductivity studies of carboxy methylcellulose doped with ammonium nitrate as solid polymer electrolytes

August 2013

Solid polymer electrolytes have been prepared by solution casting technique. Carboxy methylcellulose (CMC)-ammonium nitrate (AN) films were studied with varied AN salt concentration from 5-50 wt.% at ambient temperature. X-ray diffraction (XRD) pattern shows the amorphous nature of polymer electrolyte samples. IR-spectra confirm the polymer-salt complexes in the range of 1633 - 829 cm-1. Impedance analysis reveals that...

Author(s): K. H. Kamarudin and M. I. N. Isa

Optical properties of as-deposited TiO2 thin films prepared by DC sputtering technique

August 2013

Amorphous titanium dioxide TiO2 thin films have been deposited using the dc sputtering technique. The structure of the films was analyzed by X-ray diffraction and the results showed non-crystalline behavior. The optical properties of these thin films have been investigated by means of optical reflectance and transmittance spectra. The optical energy gap Eg, the Urbach tails Eu, the single oscillator energy Eo, the...

Author(s): M. M. Abd El-Raheem, and Ateyyah M. Al-Baradi

Flow behaviour of polyvinyl alcohol (PVOH) modified blends of polyvinyl acetate (PVAc)/natural rubber (NR) latexes

August 2013

During compounding processes, polymer latexes are mixed with various colloidal systems (in particular, PVOH) or surface-active agents to modify the flow behaviour in order to suit the manufacturing process. In this study, the flow behaviour of aqueous dispersed PVAc, NR and different mixed dispersions were investigated both in the absence and presence of PVOH as flow modifier, using an Ostwald glass capillary...

Author(s): Stephen Shaibu Ochigbo

Synthesis, structural and optical characterizations of cadmium oxide (CdO) thin films by chemical bath deposition (CBD) technique

August 2013

Thin films of cadmium oxide (CdO) were synthesized and characterized using chemical bath deposition (CBD) technique. The XRD studies revealed amorphous CdO thin films which upon annealing at 623K transformed to polycrystalline structure. The optical studies showed that the CdO films have high average transmittance over 60% in the visible region and direct optical bandgaps of 2.02 ± 0.05 eV, 2.03 ± 0.05eV...

Author(s): B. A. Ezekoye, V. A. Ezekoye, P. O. Offor and S. C. Utazi

Performance of community based organizations in managing sustainable urban water supply and sanitation projects

August 2013

The advocacy of climatic change and ever increasing poverty has its impact on environmental degradation. Most of underdeveloped countries have experienced this impact through technical, economic, institutional and social constraints on water supply and sanitation infrastructures. The impact has much effect in urban areas (informal settlements) due to the nature of such settlements. Lack of a sustainable approach and an...

Author(s): G. E. Kifanyi, B. M. B. Shayo and J. M. Ndambuki

Studies on drying rates of brined and spiced Clarias gariepinus (Catfish) using solar dryer

August 2013

The objective of this study was to determine the effect of brining and spicing with ginger or garlic on the drying rate of cat fish in a passive solar dryer. Samples of cat fish were solar dried under three different conditions: brine only, spiced with garlic and spiced with ginger. Their respective weight losses were used to determine the reduction in moisture contents. Graphs of drying rate versus time were plotted in...

Author(s): Oparaku, Nkiruka and Ojike, Onyekwere

trans-[PtCl2(NH2C6H4CO2H)2]: a platinum complex forming a two-dimensional hydrogen-bonded network

August 2013

The compound trans-[PtCl2(NH2C6H4CO2H)2] has been prepared from the hydrolysis of a platinum diimine complex, and has been characterised by X-ray crystallography. The crystal structure revealed that the compound forms a two-dimensional hydrogen-bonded network in the solid state, with pairs of O–H···O hydrogen bonds between carboxylic acid groups linking the molecules into zigzag tapes,...

Author(s): Ayi A. Ayi, Andrew D. Burrows, Mary F. Mahon and Anna J. Warren

Experimental determination of layers films thicknesses

August 2013

The determination of particle induced x-ray emission (PIXE) cross sections and the concentration of elements in a material require the knowledge of the target sample thickness. In this aim, measurements of the thickness by three different methods have been performed. These are absorption of X-rays by a 55Fe source, transmission of alpha particles by a 241Am source and Rutherford backscattering of alpha...

Author(s): S. Ourabah, A. Amokrane,  and M. Abdesselam

Role of finite element method (FEM) in predicting transverse modulus of fiber-reinforced polymer (FRP) composites: A revelation

August 2013

The present investigation aims to validate finite element method (FEM) in micromechanical analysis of a unidirectional continuous fiber reinforced composites and experimental verification of results in case of fiber-matrix debond. Available analytical models are reviewed, compared and are seldom in agreement with each other in case of transverse modulus of unidirectional continuous fiber reinforced composites. Reasons...

Author(s): Srihari P. Anne, Ramana K. V., Balakrishna Murthy V. and Rao G. S.

Improved energy efficiency of photogalvanic cell with four dyes as photosensitizers in Tween 60- Ascorbic acid system

August 2013

The objective of this work was to increase the energy efficiency of photogalvanic cell using four dyes; Amido Black 10B, Bromocresol purple, Carmine and Biebrich scarlet as photosensitizers in Tween 60-Ascorbic acid system. Observed values of photopotential, photocurrent, fill factor, conversion efficiency and storage capacity for Tween 60 -  Amido Black 10B - Ascorbic acid system were 996 mV, 420 µA, 0.38,...

Author(s): K. R. Genwa and C. P. Sagar

Evaluation of extraction methods for the analysis of selected polybrominated diphenyl ethers and hexabromobiphenyl (BB-153) – application to aqueous environmental samples

August 2013

The increasing evidence of the presence of organic pollutants in different aqueous matrices has led to the development of many analytical techniques. The isolation of these compounds from the aqueous matrices remains an integral component of these techniques. In this study, the performance of three different extraction methods, namely separatory funnel, magnetic stirring and solid-phase extraction methods commonly...

Author(s): Daso, Adegbenro P.,, Fatoki, Olalekan S. and Odendaal, James P.

Theoretical study on structural and electronic properties of 4-[(E)-[4-(trifloromethyl)-1,3-benzothiazol-2-yl]azo]naphthalen-1-ol and 1-[(E)-[4-(trifloromethyl)-1,3-benzothiazol-2-yl]azo]naphthalen-2-ol using density functional theory (DFT)

August 2013

In this work, the structural and electronic properties of 4-[(E)-[4-(trifloromethyl)-1,3-benzothiazol-2-yl]azo]naphthalen-1-ol (ortho-OH) and 1-[(E)-[4-(trifloromethyl)-1,3-benzothiazol-2-yl]azo]naphthalen-2-ol (para-OH) using density functional theory (DFT) were presented. The calculated vibrational frequencies were compared very well with experimental. The total energy for the isomers A and B were -4277242.55 and...

Author(s): Bello Isah Adewale and Semire Banjo

Assessment of leachate effects to the drinking water supply units in the down slope regions of municipal solid waste (MSW) dumping sites in Lahore Pakistan

July 2013

The aim of this study was to evaluate seasonal as well as moderate temporal effects on deep groundwater quality by the dumpsites leachate in the Lahore Metropolitan with a population of about 8 million. Groundwater samples for this study ware drawn from groundwater supply units installed by local government for the provision of drinking water to the residents. The groundwater in down slope regions from municipal solid...

Author(s): Khalid Mahmood, Syeda Adila Batool, Asim Daud Rana, Salman Tariq, Zulfiqar Ali, and Muhammad Nawaz Chaudhry

Modelling of solar radiation for West Africa: The Nigerian option

July 2013

The United Nations Framework Convention on Climate Change (UNFCCC) reports indicate that those who are least responsible for climate change are also the most vulnerable to its projected impacts. In no place is this more evident than in Sub Saharan Africa, where greenhouse gas (GHG) emissions are negligible from a global scale. In Africa, energy demands could be the major factor that may lead to the increase of its...

Author(s): Cecily Nwokocha, Raymond Kasei and Urias Goll

Study of the effect of particles size and volume fraction concentration on the thermal conductivity and thermal diffusivity of Al2O3 nanofluids

July 2013

In this study we present new data for the thermal conductivity enhancement in four nanofluids containing 11, 25, 50, and 63 nm diameter Aluminum oxide (Al2O3) nanoparticles in distilled water. The nanofluids were prepared using single step method (that is, by dispersing nanoparticle directly in base fluid) which was gathered in ultrasonic device for approximately 7 h. The transient hot-wire laser beam displacement...

Author(s): Faris Mohammed Ali, W. Mahmood Mat Yunus and Zainal Abidin Talib

Novel method of iron removal from underground dug well waters in communities around Okada town, Ovia North-East L.G.A. Edo State

July 2013

Some indices of pollution were studied in water samples from 25 dug wells randomly selected from Okada town and it’s environ. Physicochemical parameters measured include temperature, pH, colour, turbidity, total dissolved solids (TDS), toxic shock syndrome (TSS), total hardness, Ca, Mg, Fe, Mn, nitrate and phosphate etc. The results of the study showed that dug wells from this area contain Fe and Mn concentrations...

Author(s): Chike Luke Orjiekwe,  Kehinde Oguniran and Solola Saheed Abiodun

Application of regression and multiple correlation analysis to morning hours solar radiation in Lapai

July 2013

Solar radiation in Lapai within the morning hours has been estimated by correlating meteorological parameters. This was achieved by applying the first and second order regression and multiple correlation analysis method. The correlation coefficient based on the first and second order equations in temperature and relative humidity were 0.828, 0.692, 0.860 and 0.622 while the correlation coefficient based on the multiple...

Author(s): Agbo G. A., Alfa B., Ibeh G. F. and Adamu I. S.

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