Archives-April 2012

A general framework for the development of a new generation of PM Linear Oscillating Machine (PMLOM) using FE magnetic analysis suitable for short strokes is described in this paper. A microcontroller based IGBT inverter is developed for the control of thrust and oscillation frequency. The PMLOM can perform precision oscillation task with relatively low power dissipation. The use of powerful permanent magnet material such as Neodymium-Iron-Boron alloys has greatly improved the performance of the machine. The forces for aluminium mover embedded with rare earth permanent magnets are determined analytically and the results are validated extensively by comparison with finite element analyses.

In this paper, the dynamics of spatially extended infected phytoplankton with the Holling type II functional response and logistically growing susceptible phytoplankton system and also the phytoplankton dynamics with susceptible and infected class of populations with diffusion is studied. The reaction diffusion system exhibits spatiotemporal chaos and pattern formation in phytoplankton dynamics, which is particularly important role for the spatially extended systems. We obtained the condition of diffusion-driven stability for the spatial dynamical system. Also we obtained the numerical simulation for the chaos and pattern formation for understanding the dynamical behavior of the phytoplankton system.

Sustainable development is the major discussion on the world center stage today. For instance, UNESCO declared 2005-2015 as the world decade of education for sustainable development.  In addition, an intrinsic part of the United Nations millennium goals is to ensure environmental sustainability and one of the targets is integrate the principles of sustainable development into the policy of every country around the world. Nigeria as a country is not left out in the comity of nations in various use and applications of chemicals in almost all facet of life which usually have health and safety implications. The chemical and its ancillary industries contribute up to 80% of the waste released into the air water and land every day.  The practice of sustainable chemistry also known as green chemistry is the only antidote to address the myriads of problems threatening the future shape of our environment. The effect of greenhouse emissions of CO₂ arising from the intensive burning of fuels in the various automobiles on the roads, the accumulation and non biodegradable nature of the various fertilizers and pesticide in use for agriculture, the direct discharge, dumping of toxic chemicals and wastes into the ecosystem and the food chain, and the non regulatory nature on the use of the various chemicals in our research, teaching and industrial laboratories.

This article discus a bout basic technologies which normally are used for different integration solutions and approaches to integrating data and information for enterprise information systems. In fact we are trying to find out the techniques that might be utilized in every solutions and approaches in order to integrate data and information from disparate sources this article discussing a bout basic and core technologies that work as hart of data integration solutions. This article contains eight sections and each section describes one technology. The eight basic technologies are included; Information Extraction, Data Cleansing, Extensible Markup Language (XML), Schema Matching, Schema Mapping, Schema Standards, Web Dynamic Technologies, Keyword Search.

The State of the art of concrete filled steel tubular columns is presented in this paper. Experimental data has been collected and compiled in a comprehensive format listing parameters involved in the study. Areas of further research are presented and results of ongoing experimental and numerical investigations are also shown.

An estimation of volumetric efficiency in large sample neutron activation analysis through the application of an empirical expression for the full energy peak efficiency was done. The gamma-ray self-attenuation correction factor and the geometric correction factor based on which the volumetric efficiency is finally estimated were experimentally and theoretically determined respectively. Within the limits of mass range of the sample investigated, there was no significant difference between the photo-peak efficiency and the volumetric efficiency. The result of the study therefore establishes that the mass (volume) of the test portions does not have significant effect on the efficiency of elemental detection when geometrical correction is considered.

Nickel (II) complexes and Copper (II) complexes with the two ligands TPA and 2-N-benzyl TPA with nitrate anion are prepared. The isolated solid complexes are subjected to various physical measurements, such as conductivity measurements, and spectral behaviour apart from the chemical analysis.

We are very happy to announce that from 13th April 2012 Dr. Wichian Sittiprapaporn has joined the team of Elixir Editorial Advisory Board. He will carry a special responsibility for dealing with manuscripts based on Faculty of Medicine. Dr. Wichian Sittiprapaporn is currently working at Faculty of Medicine, Mahasarakham University, Talad Sub-district, Mueng District, Mahasarakham Province 44000, Thailand. The appointment of Dr. Wichian Sittiprapaporn as member Editorial Advisory Board strengthens the links and will make it easier for prospective authors to establish contact with the journal. Please send any expressions of interest to chiefeditor@elixirjournal.org. Sincerely Editor-in-Chief

Table of contents for the month of April 2012