September 2012

A review of experimental studies on double-porosity soils

Double-porosity is an important characteristic in soil that is found to influence the migration of fluids within the soil. Of late, a number of laboratory experiment studies have been carried out on the flow of water through soil media with double-porosity characteristics as well as on the mechanical aspects of the double-porosity structure of the soil. This paper first introduces the double-porosity concept as apposite...

Author(s): Su Kong Ngien, Norhan Abd. Rahman, Kamarudin Ahmad and Roland W. Lewis

September 2012

Chemical characteristics of precipitation in central Liaoning Province, Northeast China

The chemical characteristics of precipitation were analyzed based on the chemical composition of principal ionic within acid rain (from February 2007 to January 2008) of Liaozhong Meteorological Station (LMS) located in Malong Village in central Liaoning Province of Northeast China, meteorological conditions on the corresponding period ground, and variation of several air pollutants concentration. The results indicated...

Author(s): Houfeng Liu, Yizhen Chen, Shanzhong Qi and Chunnan Zhang

September 2012

Supply response of mustard in Bangladesh: A cointegration analysis

An attempt has been made in this study to examine the supply response of mustard through cointegration and vector error correction approach. Augmented Dickey-Fuller (ADF) test indicates that all the variables considered have a unit root problem at level form and is stationary at differenced form for which all the data series are I(1). The trace statistic and maximum eign value tests confirm that there is at least one...

Author(s): A. S. M. Anwarul Huq, Fatimah Mohamed Arshad and Md. Ferdous Alam

September 2012

Dynamic modeling and analysis of T-source electronic inverter using state space technique

T-Source inverter is a single stage power converter which can be used as a cost effective alternative for Z-source inverter. Dynamic modeling and analysis of T-source inverter (TSI) is vital for the determination of system limits, components selection for T-shape impedance network and controller design. A novel dynamic model of TSI in continuous conduction mode using the state space approach has been derived here. The...

Author(s): P. Sivaraman, A. Nirmal Kumar and P. Prem

September 2012

Application and efficacy of information technology in construction industry

In the 21st century, information technology (IT) is seen as a tool that assists companies to perform more efficiently and effectively. However, many studies have posed the question whether the benefits outweigh the investments. The issue is more serious in the construction industry where there are factors that limit performance such as inadequate training, ineffective use of IT infrastructures, maintenance...

Author(s): Farag H. Gaith, Khalim A. R. and Amiruddin Ismail