BUKU ABSTRAK - Universiti Putra Malaysia

Science, Technology & Engineering
New Approach to Use of Kenaf for Paper and Paperboard Production
Assoc. Prof. Dr. Jalaluddin Harun
Ahmad Azizi Mossello, Hossein Resalati, Rushdan Ibrahim, Paridah Md. Tahir, Sayeed Rashid Fallah Samsi
and Harmaen Ahmad Saffian
Institute of Tropical Forestry and Forest Products, University Putra Malaysia,
43400 UPM Serdang, Selangor, Malaysia.
+603-8946 6977; aziziahmad99@yahoo.com
Kenaf stem consists of two distinct fibres i.e. core and bast that are significantly different in nature and
structure, and show different behaviour during paper making process. The main objective of this study was to
determine the suitability of fractionation and sequence selective process (separation long fibre and short fibre,
beating long fibre, and remixing with short fibre to target freeness) as a new approach to use of kenaf for paper
and paper board production. In this study, a laboratory Bauer McNett Classifier with screen 18 mesh (1mm) was
used to separate short fibre and long fibres of the unbeaten kenaf whole soda-AQ pulps i.e. kenaf high kappa with
kappa number 49.44 and kenaf low kappa with kappa number 24.55. Also for comparison, the initial unbeaten
pulps were beaten in the PFI to same freeness (300 mL). The results showed that fractionation with making good
opportunity to beating long fibre at higher PFI revolutions and better fibrillation significantly improved all paper
properties of kenaf pulps except for tear index and produced sheet with better drainage and strength properties
compared to beaten pulps especially in case of kenaf high kappa pulp. So, it can be considered as new approach
to enhance kenaf whole stem pulp properties.
Keywords: Kenaf, fractionation, beating, drainage time, strength properties
Optimisation of Earthquake Energy Dissipation System by using Genetic
Algorithm
Assoc. Prof. Dr. Jamaloddin Noorzaei
Farzad Hejazi, Saleh Jaafar and Waleed Thaanon
Institute of Advanced Technology, University Putra Malaysia,
43400 UPM Serdang, Selangor, Malaysia.
+603-8946 6371; jamal@eng.upm.edu.my
The application of modern control techniques to diminish the effects of seismic loads on building structures
offers an appealing alternative to traditional earthquake resistant design approaches. A number of studies and
experimental tests have been carried out to assess and examine the how structures, which are furnished with
different types of dampers, respond to seismic. However the challenge in this field is to enhance performance
of viscous damper to minimise of seismic response of buildings and optimisation earthquake energy dissipation
system for diminish effect of earthquake on buildings. Recently, genetic algorithms are implemented in a computer
simulation in which a population of abstract representations of candidate solutions to an optimisation problem
evolves toward better solutions. In the present innovation system, a genetic algorithm is used for optimising
earthquake energy dissipation device operation for the reinforced concrete buildings in earthquake excitation
in order to minimise seismic damage and response of structure and guarantee building safety. For this purpose,
all genetic algorithm optimisation components include of optimisation design variables, objective function and
design constraints are developed based on the analysis of three dimension reinforced concrete buildings furnished
by viscous damper in multi support dynamic excitation.
Keywords: Viscous damper, optimisation, earthquake, genetic algorithm
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