4 research outputs found
Development and properties of composite cement reinforced coconut fiber with the addition of fly ash
<p>The addition of 15 wt. % of coconut fiber has shown lowest value of density (1735
kg/m<sup>3</sup>) while reference samples show both lowest values in moisture
content (3.64 %) and water absorption (0.79 %) compared to cement reinforced
coconut fiber composite. Cement reinforced with 9 wt. % coconut fiber composite
gave a better mechanical properties compared to others with highest values in
compressive strength (58.98 MPa) and MOR (15.81 MPa). From this research, it
was found that the coconut fiber can be used as reinforcement and fly ash can
be applied as a substitution of sand in the development of coconut fiber
based-green composite. Increasing content of coconut fiber will increase the
compressive strength and modulus of rupture until some optimum composition (9 wt.
% of coconut fiber).<br></p><p>Full paper can be downloaded via below arXiv URL.</p
Comparison of dynamic mechanical properties of non-superheated and superheated A357 alloys
<p>The
influence of superheat treatment on the microstructure and dynamic mechanical
properties of A357 alloys has been investigated. The study of microstructure
was performed by optical microscope. Dynamic mechanical properties (storage
modulus, loss modulus and damping capacity) were measured by the dynamic
mechanical analyzer (DMA).
Microstructure showed coarser and angular eutectic Si particles with
larger α-Al dendrites in non-superheated A357 alloy. In contrast, finer and
rounded eutectic Si particles together with smaller and preferred oriented α-Al
dendrites have been observed in superheated A357 alloy. Dynamic mechanical
properties showed an increasing trend of loss modulus and damping capacity
meanwhile a decreasing trend of storage modulus at elevated temperatures for
superheated and non-superheated A357 alloys. The high damping capacity of
superheated A357 has been ascribed to the grain boundary damping at elevated
temperatures.</p><p>A full paper can be downloaded via below arXiv URL. </p
Effects of Rolling Deformation and Annealing Treatment on Damping Capacity of 1200 Aluminium Alloy
Annealing treatment is an
important step of rolling deformation that contributes to microstructural
evolution and leads to the significant changes in damping capacity. Damping
capacities were analyzed in the parallel to rolling direction at 1 and 10 Hz
respectively. It was found that severe plastic deformation at 40 percent
reduction has lower damping capacity compared to that of 30 percent and 20
percent reductions respectively. The microstructural results show that the
grains of as rolled alloys were changed to almost equiaxed structures after a rolling
reduction at 40 percent reduction.<div><br></div><div>Full paper can be downloaded via below arXiv URL.</div
Digital Presence of Academic Scholars: A Case of Universiti Teknologi MARA, Perlis Branch, Malaysia
<p><i>The
advent of Internet has triggered academia to play important roles in scholarly publication
activities leading to the use of academic profiling sites for
researchers to exchange and share research ideas. However, several studies
have claimed that many of the academic scholars especially in Malaysia have remained
conservative and have refused to fully acknowledge
the real potential of this new gadget. Since there are few written
papers on online visibility in Malaysia particularly in academic scholars’ context,
the study aims to highlight the extent of online visibility among academic
researchers in Universiti Teknologi MARA (UiTM), Perlis Branch. By examining
five common basic online profiling sites (i.e. ResearchGate, Academia, Google
Scholar, ResearcherID and ORCID), it was found that only 31.4% of
researchers at UiTM, Perlis Branch had at least one profile, the Faculty of
Applied Sciences and the Faculty of Computer and Mathematical Sciences were the
top two online profiling site users and Google Scholar was the most widely used
platform. In terms of the institutional position, Senior Lecturers appeared to
be the top users of profiling sites compared to Associate Professors and Lecturers. The
implications of these findings were discussed. </i></p