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Case study: free space path Loss for Mobile Network and WLAN
No full textLink to publisher's homepage at https://aset.unimap.edu.myWireless communication systems transmit and receive information through free space. Thus,
there are other factors to consider when designing a wireless communication system. One of
those factors is Free space Path Loss (FPSL), which refers to the loss of signal strength in the
propagation of the signal in free space. In this study, the effects of obstruction and distance
on the FSPL of the transmission in mobile networks and Wireless Local Area Networks
(WLAN) will be measured. The measured results show that the obstructions have a higher
impact on the received signal compared to the distance. In the mobile network setting, the
open area has an FPSL of 111 dB, whereas the obstructed office area has a significantly
higher FSPL of 158 dB. Furthermore, in the WLAN setting, the FSPL of an obstructed area is
19 dB higher than the line-of-sight propagation. Thus, the layout of the area to implement a
wireless communication system must be thoroughly analyzed for obstructions and distance
to provide optimal wireless communication service to customers
Physical Characteristic and In-Vitro Bioactivity Property of Sintered Glasses made via Sol-Gel and Powder Sintering Process
No full textLink to publisher's homepage at https://aset.unimap.edu.myIn this work, ternary system (SiO2-CaO-P2O5) biocompatible glass with different compositions (CaO/P2O5 ratio) were prepared by sol-gel method and sintering process. The physical characteristic and bioactive properties of each different sample composition were analyzed using XRF, particle sizer, N2 adsorption-desorption, FTIR, XRD, and FESEM-EDX. The sintered glass pellets were subjected to immersion studies in a simulated body fluid (SBF) solution for 14 days. All compositions of gel-glass particulates showed mesoporous-type structures and consisted of very high porosities with nano-pores in size. Different Ca/P ratios in gel-glass composition are affected by different porous characteristics. All compositions of sintered glass showed very good bioactive behavior by significant deposition of the carbonate apatite layer. Sintered glass with the Ca/P ratio = 2.33 showed very significant bioactive properties as it also comprised the highest pore volume and size. However, sintered glass with the lowest Ca/P ratio (Ca:P=1.50) showed a quite significant reduction in the bioactive property as it also consisted of the lowest pore volume and pore sizes. Hence, the in-vitro bioactivity property of sintered glass is significantly influenced by the increase in its porous characteristics due to differences in the Ca/P ratio
JKes UniMAP guna teknologi pesawat tanpa pemandu pantau keselamatan kampus
No full textLink to publisher homepage at https://www.unimap.edu.my/Sebagai alternatif tambahan bagi meningkatkan kawalan keselamatan dalam kampus, Jabatan Keselamatan (JKes) Universiti Malaysia Perlis (UniMAP) menggunakan teknologi Pesawat Udara Tanpa Pemandu (dron)