The increasingly widespread of using computers in daily life has brought the piranti as assistant for human. One of the application computer in the field of security has increased it is role is in terms of facial recognition. Face recognition is the process of human identification with the face image. With the increasingly widespread use of computers, is expected to face recognition capabilities can be adapted on the smart device. The adaption process became possible with the discovery of variety of facial recognition methods, one of which is the Principal Component Analysis (PCA). Research began by designing a computer program using the programming language Matlab. The program is used to test the results of PCA with several facial image. At the end it can be concluded that PCA is quite worthy of a face recognition method. The research data shows recognition results were pretty good with quite small error rate...

877 hits

Thiourea is known to be a unique class of organic compounds especially acylthiourea since they consist excellent Hbonds donor and acceptor where it has strong ability to form metal complexation with various metal salts. Therefore, six members of acylthiourea derivatives (TH1-TH6) have been successfully synthesized and characterised using selected spectroscopic and analytical methods namely Fourier-Transform Infrared (FT-IR) spectroscopy, UV-visible (UV-vis) spectrophotometer, and CHNS elemental analysis. In turn, all the synthesised TH1-TH6 were used to investigate the anti-bacterial activity towards selected bacteria of both Gram-negative and positive namely Salmonella typhi and Bacillus cereus respectively. TH1-TH6 revealed to have good activity towards S. typhi and B. cereus with specific and broad-range spectrum activity...

1884 hits

In this study, new members of alkyl substituted thiourea derivatives of (RC(O)NHC(S)NHCH2CH(CH3)NHC(S)NHC(O)-R) in which R represents alkyl group namely isobutyryl and pivaloyl were successfully synthesized for their antibacterial activities. The compounds were spectroscopically and analytically characterized via infrared (IR) spectroscopy, ultraviolet–visible (UV– vis) spectroscopy, CHNS elemental analysis as well melting point analysis. In turn, they were screened for antibacterial activity using selected bacteria namely, Micrococcus sp., Salmonella typhi, Aeromonas sp., Klebsiella pneumoniae, Bacillus cereus and also Escherichia coli. From the antibacterial test, all synthesized compounds were found to exhibit great potential results as antibacterial agents, except for 1 which did not show inhibition activity towards Klebsiella pneumoniae. Thus, these proposed molecular structures have given ideal indication to act as antibacterial agents which have utmost potential in pharmaceu.....

1809 hits

Synthesis of graphene with the high surface area has been very attractive for various energy storage applications. In this work, we describe a scalable method for producing edge scrolled reduced graphene oxide (r-GO) with the high surface area by modified Hummer’s method. Strong acid treated graphite flakes were used to synthesis reduced graphene oxide. Few layered, edge scrolled reduced graphene oxide was obtained by low temperature (200℃) thermal treatment in a hydrogen atmosphere. The formation of few layered graphitic structure of reduced graphene oxide was confirmed by TEM analysis. The specific surface area of the reduced graphene oxide was measured by nitrogen adsorption technique. The reduced graphene oxide derived from acid treated graphite flakes exhibits high surface area (~ 500 m2/g) than non acid treated graphite flakes (214.4 m2/g)...

424 hits

Recently, porous silicon (PS) gains a lot of research interest with its potential applications in optoelectronics, flat panel displays technology, and chemical sensor. In this work, PS was chemically etched on p-type silicon (Si) wafer by hydrofluoric acid (HF) with 40% nitric acid (HNO3) concentration at different etching time. The PS has porosity dependent on etching time in the range (38-60) % that gives orange-red photoluminescence (PL) between 657 nm to 661 nm. The PL intensity increases and the peak wavelength shows slight blue shift as etching time increases. The energy gap obtained are higher than pure Si (1.11eV). Meanwhile, the conductivity of the PS decreases as the porosity and energy gap increase...

2889 hits

Synthesis of carbon nanotubes with different concentrations of ferrocene (C10H10Fe) as catalyst (5.33, 10.66, 13.99- 19.99 wt%) from waste engine oil precursor has been done to study its effects on the growth of carbon nanotubes. Thermal chemical vapor deposition method was used in this study. The synthesis process lasted for 30 minutes under argon gas ambient in constant precursor vaporization and synthesis temperature of 450°C and 750°C respectively. The characterization of prepared samples were done using field emission scanning electron microscopy, micro-Raman spectroscopy and thermogravimetric analysis. High density carbon nanotubes was produced at 17.99 wt% catalyst concentration with purity of 72%. The results show that the structure, diameter size and quality of carbon nanotubes are highly affected by the catalyst concentrations...

790 hits

A great deal of information have been generated on the efficacy of bacterial entomopathogens against insect pests. However, relatively little information is available for the cocoa pod borer (CPB), Conopomorpha cramerella (Snellen). The pathogenicity of seven isolates as entomopathogen was evaluated against the CPB adult and their effects as oviposition deterrent in an ambient laboratory environment of 28±2ºC and 60-90% RH. A Sigma® hand atomizer was used to deliver an even volume median diameter (VMD) droplet spray of 75 μm of 1 x 106 c.f.u. mL-1. The cells of all bacterial isolates tested could cause infection and inflicted mortality on the CPB adults. The isolates of Pseudomonas aeruginosa and Serratia marcescens significantly killed 93.33% of the CPB adults at the fourth day of exposure. The supernatant of S. marcescens also demonstrated significant kill of 86.66% of the CPB adults. The isolates P. aeruginosa and S. marcescens also significantly deterred the CPB moths from ovip.....

1128 hits

Para pelajar sering menghadapi masalah untuk menceritakan kandungan video yang mereka tonton kerana kurang keupayaan dan keyakinan diri untuk menceritakannya tanpa rangsangan daripada guru. Oleh itu, kajian ini bertujuan untuk melihat keberkesanan garis pandu dalam membantu pelajar menjana idea untuk komponen lisan bagi bahagian perbualan berdasarkan video. Sehubungan dengan itu, para pelajar telah diajar menggunakan kaedah 4P, iaitu penjelasan, pengalaman, pendapat dan pengajaran untuk menceritakan dengan penuh yakin video yang telah mereka tonton. Kajian ini merupakan kajian tindakan yang melibatkan 14 orang pelajar Menengah 3 aliran Normal Teknikal. Dapatan kajian menunjukkan pelajar dapat mencapai markah yang baik selepas mengaplikasikan kaedah 4P. Pelajar juga menunjukkan minat dan penglibatan yang lebih aktif dalam pembelajaran. Guru boleh menyediakan lebih banyak ruang untuk pelajar menjana idea bagi membantu perbualan pelajar dengan lebih tersusun...

578 hits

Kajian ini bertujuan untuk melihat penggunaan Kaedah Sebut Baca Bergambar dalam meningkatkan pertuturan dan pembacaan murid-murid bermasalah pendengaran di Sk Sri Adika Raja Gerik, Perak. Seramai tiga orang murid dijadikan responden di dalam kajian ini. Fokus utama di dalam kajian ini ialah murid menyebut huruf vokal (v), huruf konsonan (k) dan membaca perkataan kvkv dengan bantuan gambar. Kaedah Sebut Baca Bergambar ini dijalankan dengan meminta murid mengisyaratkan gambar yang ditunjukkan berulang kali dengan betul. Setelah itu baharulah diajar mengeja perkataan kvkv dan membaca perkataan kvkv. Kemudian diajar pula menyebut bunyi suku kata, mengeja dan membunyikan semula suku kata kv dan disusuli dengan menyebut nama huruf bagi perkataan kvkv tersebut. Metodologi yang digunakan oleh pengkaji ialah melalui ujian pra dan pos. Sebelum memulakan kajian, pengkaji telah menjalankan pemerhatian terhadap murid dan menjalankan temu bual kepada ibu bapa. Hasil daripada kajian ini menunjukkan m.....

1230 hits

Analisis pengajaran dan pembelajaran topik pecahan mendapati sebahagian murid menghadapi kesukaran untuk menukar pecahan tak wajar kepada nombor bercampur. Pelbagai jenis kesilapan dapat dikesan melalui ujian diagnostik, pemerhatian, temu bual serta analisis dokumen seperti lembaran kerja dan buku latihan murid. Antara kesilapan yang dikenal pasti ialah kesilapan algoritma bahagi, membina sifir, menulis nombor bercampur dan penggunaan garis nombor pecahan. Oleh itu, kajian tindakan ini dijalankan bertujuan membantu meningkatkan penguasaan murid berpencapaian lemah Tahun 4 dalam topik pecahan yang melibatkan kemahiran menukar pecahan tak wajar kepada nombor bercampur. Peserta kajian dibimbing untuk memahami konsep dan seterusnya menguasai kemahiran penukaran pecahan tak wajar kepada nombor bercampur dengan menggunakan bahan manipulatif ATS. Peserta kajian terdiri daripada dua orang murid perempuan yang dipilih berdasarkan pencapaian ujian diagnostik. Kajian tindakan ini menggunakan pend.....

1528 hits