June 2013
Synthesis, structural and dielectric properties of zinc sulfide nanoparticles
Zinc sulfide (ZnS) nanoparticles were synthesized by the wet chemical method. The crystal structure and grain size of the particles were determined, using X-ray diffraction (XRD). The optical properties were studied by the Ultraviolet-Visible (UV-Vis) absorption spectrum. The dielectric properties of ZnS nanoparticles were examined using a HIOKI 3532-50 LCR HITESTER over the frequency range of 50...
June 2013
Investigation of carbon monoxide concentration from anthropogenic sources in Lagos, Nigeria
The work investigated the carbon monoxide (CO) concentration from anthropogenic sources in eight, different Local Council Development Authority (LCDA) in Lagos State Nigeria. The CO concentration obtained as a result of movement of cars, trucks, motorcycles, working of generators, commercial and residential activities etc., was measured using the digital carbon monoxide detector (model: DC01001) manufactured by General...
June 2013
Harmonic curvature of the curve-surface pair under Möbius transformation
The Möbius transformation is known as a part of analysis and mostly studied by the researchers and scientist who made their investigations on analysis. But in this paper it is worked together with differential geometry. It is well known that harmonic curvature of the curve is found by Hacısalihoglu and also harmonic curvatures and of the curve-surface pair that we call the...
June 2013
Using social network systems as a tool for political change
Social network sites like Facebook, Twitter and YouTube play a significant role in the political arena nowadays. They are growing engagement tools that assist in improving the political process by helping electoral candidates in communicating their political programs and thoughts to the community, as well as in rallying their campaign supporters. On the other hand, voters can also use social media sites to...
June 2013
Detection and wavelet analysis of acoustic emission signal from partial discharge captured by multimode optical fiber and piezoelectric sensors in insulation oil
High-voltage transformer is the most critical and expensive component in a power system network in order to ensure the stability of the system. Partial discharge (PD) detection is a technique widely used for high voltage equipment insulation condition monitoring and assessment. In this paper, the characteristics of two acoustic sensors multimode fiber optical (FO) and piezoelectric (PZT) sensor have been successfully...
June 2013
Effect of fiber size on elastic constants of hybrid elliptical fiber reinforced lamina
Micromechanical analysis of an fiber reinforced polymer (FRP) lamina consisting of unequal sizes of unidirectional continuous elliptical fibers of two different materials arranged in hexagonal pattern is the present subject. The objective is to observe the change in Young’s modulii and Poisson’s ratios due to change in volume fractions and ellipse aspect ratio ‘a’ of individual fibers in a...
June 2013
Impact of dust on the photovoltaic (PV) modules characteristics after an exposition year in Sahelian environment: The case of Senegal
The objective of this paper is to find the effect of dust on the performance of photovoltaic modules. To this end, the International Center for Research and Training in solar energy at Dakar University and the Lasquo-ISTIA Laboratory of Angers University have put in place a research project in order to investigate the impact of Sahelian climatic conditions on the photovoltaic (PV) modules characteristics....
June 2013
Structural properties of binary semiconductors
Using the plasma oscillations theory of solids, 2 empirical relations have been proposed for the calculation of the structural properties such as bond-stretching central force constant (α) and bond-bending non-central force constant (β) for II-VI and III-V group binary semiconductors. We find that α =D (Ñ›ωp) 2 and β = S (Ñ›ωp) 2, where D and S are constants. The...
June 2013
Relationship between magnetospheric interplanetary parameters and radio refractivity for quiet and disturbed days at Minna
The relationship of magnetospheric interplanetary parameters with radio refractivity is investigated from hourly measurement of solar wind energy and interplanetary parameters for quiet and disturbed days during dry and rainy season in Minna (Latitude 9° 36' 50" N and Longitude 6° 33' 24" E) North central, Nigeria for the year 2008. The solar wind energy, magnetospheric interplanetary...
June 2013
Mass, energy and momentum of photon in medium
When photon travels in a medium where the velocity is lower than the speed of light, the photon possesses both the kinetic (Ek) and the potential (Ep) energy. We proved that the energy of photon (E = nEk), where (n) is the refractive index, and the effective mass of photon in medium (m' = nm), where (m) is the effective mass of photon in vacuum. Also we proved that the momentum of photon (p = E/c) inside...
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