July 2012
Remote laboratory development as an action research: A case study
This work presents a case study about how action research (AR) has been conducted in developing a real-life educational system. An explanation is given of the modified implementation of the classical AR methodology, based on the requirements of a remote laboratory system developed for the vocational training of students in higher education. This study reports a successful implementation of AR stages which...
July 2012
Use of improved hue, luminance and saturation (IHLS) color space in the estimation of Nitrogen on tomato seedlings (Lycopersicon esculentum)
Measuring deficiencies in the nutrition of crops is important because it allow growers to take proper action in time so as to get better development of plants. Several methods have been proposed in the measurement of nitrogen. One of those methods is image processing using color spaces. In this study, five levels of deficiency of nitrogen were induced for the evaluation in tomato seedlings. Color images were...
July 2012
Seamless handoff across heterogeneous networks: A multi-objective optimization approach
The growing consumer's demand leads a great access to communication services anywhere and at anytime. It has started to accelerate the development of technologies that would allow for the integration of various Wireless Access Technologies. With regard to vertical handoff performance, there is a critical need for developing algorithms for connection management and optimal resource allocation for seamless...
July 2012
Invasive alien plant species: A case study of their use in the Thulamela Local Municipality, Limpopo Province, South Africa
The spread of plants from one country to another through intentional and unintentional human activities is a serious threat to the world’s biodiversity; second only to habitat destruction. However, a number of studies have shown that invasive alien plant species can positively contribute to rural economies. This paper is an attempt to document a few of these species ‘positive contribution to rural...
July 2012
Reinforced concrete beams with lightweight concrete infill
In structural design, an ideal situation in material saving is to reduce the weight of the structure without having to compromise on its strength and serviceability. A new lightweight sandwich reinforced concrete section has been developed with a novel use of lightweight concrete as infill material. The section, namely LSRC section, is suitable for use as beam or slab members. Experimental investigations into...
July 2012
The effect of nursery measures on mycorrhizal colonisation of Scots pine and occurrence of soil mites
The aim of the study was to determine the influence of organic fertilization (treated sewage sludge with addition of bark or sawdust) and mulching (forest edaphon inoculation) on the vitality of Scots pine (Pinus sylvestris L.) seedlings and their mycorrhizal structure, as well as the occurrence of soil mites (Acari). Nursery experiments were carried out in 2005 to 2007. It was stated that the studied...
July 2012
Nonlinear analysis of frames composed of flexibly connected members with rigid end sections accounting for shear deformations
The behaviour of lintel beam-to-shear wall connections plays an important role in the analysis of shear walls with openings. A computer-based method was prepared for nonlinear frames comprised of lintel beams having fully rigid end sections flexibly connected to wide column members accounting for shear deformations. The analytical procedure employed stability functions to model the effect of axial force on...
July 2012
On the efficiency of some semi- and nonparametric kernel estimators in the modeling of binary response data
The semiparametric estimation procedure of binary response data is composed of two steps. In the first step, various semiparametric estimators are used for estimating the model parameters, whereas nonparametric regression type estimators are required in the second step to obtain the probability estimates dependent on the estimated model parameters in the first step. In this study, we have investigated the...
July 2012
Jacobi doubly periodic wave solutions for three versions of Benjamin-Bona- Mahony equation
A variety of exact solutions for the Kadomtsov-Petviashvili- Benjamin-Bona-Mahony (KP-BBM) equation, nonlinear Zakharov-Kuznetsov- Benjamin-Bona-Mahony (ZK-BBM) equation and the generalized ZK-BBM equation are developed by means of the extended Jacobi elliptic function expansion method. Soliton and triangular periodic solutions can be established as the limits of Jacobi doubly periodic wave...
July 2012
The effect of aging on the machinability of AA7075 aluminium alloy
In this study, machinability tests were performed on aged AA7075 aluminium (Al) alloy through single point turning method. Before the machinability tests, AA7075 Al alloy samples were aged at 180°C for 1, 6, 12 and 24 h. The machinability tests were carried out at various cutting speeds and the resulting sample surface roughness, cutting forces and thermal changes occurring on the cutting tool were...
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