Time filter

Source Type

Lae, Papua New Guinea

The Papua New Guinea University of Technology or 'Unitech' is located 8 km outside of Lae, in the Morobe Province of Papua New Guinea. It has 13 teaching departments and 3 affiliated colleges.It is the second largest university in PNG after its 'sister' university the University of Papua New Guinea in Port Moresby. While UPNG concentrates on the arts, pure science, law and medicine, Unitech focuses on research in technological or applied science. It is the only technological university in the South Pacific, outside of Australia and New Zealand. Wikipedia.

Rajashekhar Rao B.K.,Papua New Guinea University of Technology
Solid Earth | Year: 2015

The present study attempts to employ potassium (K) release parameters to identify soil-quality degradation due to changed land use patterns in sweet potato (Ipomoea batatas (L.) Lam) farms of the highlands of Papua New Guinea. Rapid population increase in the region increased pressure on the land to intensify subsistence production mainly by reducing fallow periods. Such continuous cropping practice coupled with lack of K fertilization practices could lead to a rapid loss of soil fertility and soil-resource degradation. The study aims to evaluate the effects of crop intensification on the K-release pattern and identify soil groups vulnerable to K depletion. Soils with widely differing exchangeable and non-exchangeable K contents were sequentially extracted for periods between 1 and 569 h in 0.01 M CaCl2, and K-release data were fitted to four mathematical models: first order, power, parabolic diffusion and Elovich equations. Results showed two distinct parts in the K-release curves, and 58-80% of total K was released to solution phase within 76 h (first five extractions) with 20-42% K released in the later parts (after 76 h). Soils from older farms that were subjected to intensive and prolonged land use showed significantly (P < 0.05) lower cumulative K-release potential than the farms recently brought to cultivation (new farms). Among the four equations, first-order and power equations best described the K-release pattern; the constant b, an index of K-release rates, ranged from 0.005 to 0.008 mg kgg-1 hg-1 in the first-order model and was between 0.14 and 0.83 mg kgg-1 hg-1 in the power model for the soils. In the non-volcanic soils, model constant b values were significantly (P < 0.05) higher than the volcanic soils, thus indicating the vulnerability of volcanic soils to K deficiency. The volcanic soils cropped for several crop cycles need immediate management interventions either through improved fallow management or through mineral fertilizers plus animal manures to sustain productivity. © 2015 Author(s). Source

Pandey S.N.,Papua New Guinea University of Technology
Nuovo Cimento della Societa Italiana di Fisica B | Year: 2010

Gravitational waves are an inevitable consequence of Einstein theory of gravitation. They are meaningfully comparable with electromagnetic waves except for their non-conformal invariance. So, to obtain them conformally invariant we modify Einstein field equations by choosing a Lagrangian as a polynomial in R of a finite number of terms without associating it with any other field except gravitation. In this modified field theory of gravity we have also studied the cosmological aspects and the spherically symmetric field along with equations of motion of a particle to bring out the features of this f (R) theory of gravitation. © Società Italiana di Fisica. Source

Minh V.T.,Tallinn University of Technology | Pumwa J.,Papua New Guinea University of Technology
International Journal of Control, Automation and Systems | Year: 2013

This paper is the second part of the paper titled "Simulation and Control of Hybrid Electric Vehicles" published in IJCAS, Vol. 10(2)/2012 where the model predictive control has been built to handle the clutch engagement between the combustion engine and the electrical motor. In this research, a fuzzy logic and slip controller of clutch and vibration of the hybrid vehicle have been considered and tested as a second control strategy. The use of the fuzzy logic control can avoid the need of the complex and rigorous mathematical modeling since the fuzzy logic can work very successfully on the uncertain and imprecise information. The clutch slip controller is implemented in an experimental test vehicle for the critical vibration reduction. © 2013 Institute of Control, Robotics and Systems and The Korean Institute of Electrical Engineers and Springer-Verlag Berlin Heidelberg. Source

Pumwa J.,Papua New Guinea University of Technology
ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE) | Year: 2010

Interest in engineering ethics education has developed significant momentum in almost all advanced countries. The developing countries have not yet paid enough attention to such critical issues and Papua New Guinea is no different. This is probably the reason why corruption activities have become part of the normal activities of politicians, senior public servants and many other higher office holders as reported in the daily news media. As engineering work becomes more complex and diverse, an understanding of engineering ethics becomes an important attribute for adequate and ethical preparation of engineers along with their technical knowledge. This basically means that engineering students have to learn about their ethical obligations towards society, their employers, fellow engineers and themselves. This paper discusses the needs and reasons for integrating ethics into the education of undergraduate engineering students in Papua New Guinea. © 2013 ASME. Source

Lakshman A.,Papua New Guinea University of Technology | Subba Rao P.S.V.,Andhra University | Rao K.H.,Andhra University
Modern Physics Letters B | Year: 2010

Dielectric properties such as DC resistivity (ρ), dielectric constant (ε) and dielectric loss factor (tan δ) have been measured for Mg 0•9Mn0•1InxFe2-xO 4 and Mg0•9Mn0•1CryFe 2-yO4 at room temperature. The composition dependence of ρ, ε and tan δ and the frequency dependence of ε and tan δ are presented in this paper. The resistivity increases while the dielectric constant decreases with increasing concentrations of indium and chromium ions. The dielectric loss factor at 100 kHz increases with composition for the samples 0•1 ≤ x ≤ 0•9 and 0•1 ≤ y ≤ 0•7. The dielectric constant for a given sample decreases with increasing frequency showing the normal dielectric behavior. The values of dielectric loss factor have been found to increase with frequency for the samples corresponding to x or y = 0•1 to 0•5; while other samples showed abnormal dielectric behavior. The observed variations in ρ are explained by Verwey's hopping mechanism while the variations in ε and tan δ with composition and frequency are explained by space charge polarization using Koop's theory. Higher values of DC resistivity and low dielectric losses suggest that the prepared materials have great potential for microwave and high-frequency applications. © 2010 World Scientific Publishing Company. Source

Discover hidden collaborations