BUKU ABSTRAK - Universiti Putra Malaysia

Science, Technology & Engineering
Keywords: Bio-based, electronic, dielectric, antenna
Bio-based Kenaf Fibre Dielectric Composite: Electronic Goes Green
Dr. Alyani Ismail
Nuraida Mohamad, Nor’aini Ahmad Zawawi, Khalina Abdan and Mohd. Adzir Mahdi
Faculty of Engineering, University Putra Malaysia,
43400 UPM Serdang, Selangor, Malaysia.
+603-8946 4352; alyani@eng.upm.edu.my
In recent years, the use of natural fibre material in composites has increased and attracted some interest
for use in several industry applications such as automotive as well as building industry. The potential for future
applications as dielectric in microchips and circuit boards is yet to be discovered. Composites made from plant
sources are an attractive option due to their relative cheapness, their ability to recycle, biodegradability and low
environmental concerns. Compared to synthetic fibres made from glass, carbon and steel, natural fibres have a
high aspect ratio, high strength to weight ratio, relatively low in energy conversion and have good insulation
properties. Kenaf (Hibiscus cannabinus L) fibre is an important source of natural fibre. Extensive research has
been conducted in discovering the advantages of kenaf fibre in structural application, textile and other potential
uses. With this reason, kenaf has been identified as a bast fibre with great market potential. This is where their
application in electronic industries is demonstrated through this invention. Therefore, this invention demonstrates
the use of natural fibre-synthetic polymer bio-composite as a novel substrate for electronic application, as well
as at high frequency range. The natural fibre is Kenaf bast fibre, whereby the polymer used is common plastic,
polypropylene. The invention is demonstrated by designing the first ever Wi-Fi antenna built on the Kenafpolypropylene
dielectric substrate, where the results show promising potential of its application in electronic
industries. This invention is not limited to Kenaf and can be applied to any kinds of natural plant fibres.
Polypropylene resin is used, which is cheap. The bio-based composites materials described here offer dielectric
constant within the range of common fossil-based and woven glass dielectric materials (permittivity around 2.2)
commercially used for high frequency application. The new materials can be used to construct electronic devices,
whether active or passive.
Hyperspectral Urban Feature Detection System
Dr. Helmi Zulhaidi Mohd. Shafri
Muhamad Afizzul Misman and Raja M. Kamil Raja Ahmad
Institute of Advanced Technology, University Putra Malaysia,
43400 UPM Serdang, Selangor, Malaysia.
+603-8946 6459; hzms04@gmail.com
This system was developed specifically for urban features identification and classification from hyperspectral
data. Urban environment is highly complex and heterogeneous, thus the use of multispectral data is not sufficent.
Alternatively, hyperspectral data might offer better options in mapping urban features more accurately due
to higher spectral and spatial resolutions. However, the use of hyperspectral data is not straightforward and
advanced processing techniques are required. For this reason, a simple system is designed in this research in
order to facilitate advanced processing of hyperspectral data via the use of transformation methods and robust
classification algorithms. This system will facilitate the use of selected methods that are optimised for urban
mapping from hyperspectral data.
Keywords: Hyperspectral, wavelet transform, support vector machine
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