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Sep 30, 2016Open Access
The submarine cable served as one of the most
important tools of the western powers in their quest for empire-building and commercial profits in the 19th century.
Thus the construction of a submarine cable across the Pacific Ocean became a
priority for the western powers, especially the United States and the United
Kingdom, in pursuit of their commercial and political interests into the Asian
market. The construction of the Pacifi ...
Jul 26, 2016Open Access
This research presents a study of the ringing and voltage overshoot
analysis of a proposed DC/AC converter. This overvoltage is generated due to
the resonance between three passive components: transformer leakage inductances,
switch capacitances, and wiring resistances. By applying simple RLC circuit
equations, it proves possible to determine the analytic equations and reproduce
the voltage across the switche ...
Jul 26, 2016Open Access
In this paper is proposed a methodology to properly determine the leakage
and magnetizing inductance of a single-phase high-frequency coaxial
transformer. Both, leakage and magnetizing inductance equations are determined
considering the transformer dimensions, the ferromagnetic characteristics, and
the number of turners. Finite element methods (FEM) and a low scale prototype
are also used to validate the equations ...
Jul 20, 2016Open Access
This paper introduces a novelty method of using a Linear Prediction
Coefficient (LPC) filter, a digital signal processing (DSP) tool to get
accurate signal measurement in noisy mobile environment. By measuring the
received power of a mobile radio, it also measures the coverage of an area
served by several base stations. For results’ validation, the mobile received
power at user end of two Code Division Multiple Acccess-2000 (CDMA2 ...
May 27, 2016Open Access
The main problem associated with intermittent operation of the wind and
PV power plants is the lack of low cost electrical storage methods. In the
present paper a new type of solar chimney technology that we shall heretofore
call “Enclosed Solar Chimney Power Plant technology (ESCP technology) stands
for an effective alternative of combining both low cost electricity generation
as well as smooth, uninterrupted operation for 24 hou ...
Mar 04, 2016Open Access
In this paper an Enhanced Bean Optimization Algorithm (EBA) is used to
solve optimal reactive power problem. Stimulated by the diffusion of beans in
nature, a novel swarm intelligence algorithm-Bean Optimization Algorithm (BOA)
has been projected previously. In the domain of incessant optimization problems
solving, Bean Optimization Algorithm has exposed a first-class performance. In
this paper, an Enhanced Bean Optimization Algorithm is presented for solving
optimal reactive power problem. In t...
Dec 18, 2015Open Access
Use of low bend loss optical fibers in fiber-to-the-home (FTTH) networks
becomes unavoidable to improve the optical networks performance. One of the
candidates is photonic crystal fibers (PCFs) for their low bend loss
properties. This paper presents procedures for optimization of the bend loss of
PCFs with small and large mode areas by using solvers Softwares Rsoft and
Optifiber. The optimizations are performed with respect to bend radius, core
radius, photonic crystal pitch and the ratio of air...
Dec 08, 2015Open Access
The temperature and external optical feedback (OFB) effects on power
characteristics of external cavity semiconductor laser model based fiber Bragg
gratings (FBGs) are numerically analyzed. In this model, fiber Bragg grating
(FBG) is used as a wavelength selective element to control the properties of
the laser output by controlling the external OFB level. The study is performed
by modifying output laser equations that are solved by considering the effects
of ambient temperature ( T) variat...
Sep 28, 2015Open Access
Electric power is a key driver of economic growth and prosperity. But
access to electricity still remains a distant dream for majority of the
population living in the remote and arid areas of developing countries mostly
sub-Saharan Africa. With the growing demand for safe and reliable energy, solar as a source of energy remains the least
utilized energy source in the Kenyan economy and yet one of the safest
forms of energy. Solar photovoltaic (PV) systems have shown their potential in
rural elec...
Jul 22, 2015Open Access
The flexible control of DC motor has been donated in the extensive use of
DC motor in the era of industry, as the increasing usage of semiconductor power
converter units. The speed control of DC motor is very sophisticated and
specific. The speed of DC motor has been controlled by controlling the armature
voltage by using thyristors. The armature voltage is controlled by using the
different types of AC to DC semiconductor converters such as half wave
converter, semi converter and full wave conve...
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