Volume 7, Issue 6, June 2018


Dielectric Properties of Transparent CdS Nanofibers Synthesized Via Dc-Sputtering Technique

Author: Pradip Kumar Ghosh

Abstract- CdS nanofibers have been prepared by direct current-sputtering technique without using any catalyst or matrix. X-ray diffraction patterns and selected area electron diffraction patterns confirmed the cubic CdS phase formation in the thin films although; the initial target material was hexagonal CdS powder. TEM micrographs have confirmed the nanofiber formation with diameters in the range 2 - 4.3 nm and length a few microns. XRD patterns showed the crystal size increased with the increase of deposition time. UVVis spectra of the films have showed nearly 90 % transparency in the visible range and bandgap is higher compared to that of the bulk material. The direct bandgap increased from 3.06 eV to 3.56 eV with decrease of deposition time 20 to 7 min. The crystallite sizes have also been determined from the shift of direct bandgap with that of bulk CdS and they lie in the range 2.82 - 3.65 nm. The dielectric constant for thin films of CdS nanofibers have been measured under vacuum by using an L-C-R meter and the value of it lies in the range 55 to 73 at higher frequencies.

Keywords- CdS nanofibres; Dc-sputtering; Nanostructural; Optical, Dielectric properties


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Dynamic Modeling of Induction Machine Incorporating Transmission Line Impedance

Authors: E. J Akpama, K. M. Udoka, O. I. Okoro

Abstract- Induction motors are widely used mostly in the industry for process control. It has almost replaced the dc motor due to its simplicity in construction, reliability, efficiency and simple methods of speed control mostly the present hi-tech microprocessors. Other advantages include; low initial cost, easy operation and simple maintenance. A good mathematical model is therefore required in predicting the behavior of the induction machine under different dynamic conditions. In this paper, the effect of incorporating transmission line impedances in the modeling of the dynamic of the induction motor is investigated and the result deduced. A commercial software package, MATLAB, is used to simulate the dynamic behavior of a three phase 7.5kW induction motor with and without transmission line impedance. Results of the simulation of the conventional machine model are compared with the results of the simulation of the machine model with transmission line impedance.

Keywords- Dynamic analysis, Induction motor, MATLAB, Transmission line impedance.


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Outrigger Ships: Two Concept Designs.

Author: Victor A. Dubrovsky

Abstract- Brief description of multi-hull ship types, specificity of ships with outriggers, selected (as the base of comparison) built outrigger ship, concept designs of two type of outrigger ships: with traditional and with small water-plane area main hulls.


[1] Dubrovsky, V., “Specificity and designing of multi-hull ships and boats”, 2016, Nova Science Publishers, ISBN 9781634846158, USA, 210 p.

[2] Dubrovsky, V., Matveev, K., Sutulo, S., “Ships with small waterplane area”, 2007, Backbone Publishing Co., ISBN-13978- 09742019-3-1, Hoboken, USA, 256 p.

[3] Dubrovsky, V., “Ships with outriggers”, 2004, ISBN 0-9742019-0-1, Backbone Publishing Co., Fair Lawn, USA, 88 p.

[4] Dubrovsky. V, Lyakhovitsky, A., “Multi-hull ships”, 2001, ISBN 0-9644311-2-2, Backbone Publishing Co., Fair Lawn, USA, 495 p


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