Judul: Pengembangan Desain Sistem Pakar untuk Diagnosa Kerusakan alat Berat Bulldozer D375A-2
Abstrak: Alat berat adalah sarana untuk mempercepat proses pelaksanaan suatu pekerjaan yang sukar bahkan tidak mungkin dilakukan oleh manusia. Dalam penggunaan alat berat seringkali mengalami kerusakan·. Kerusakan yang terjadi mengakibatkan tertundanya pekerjaan yang sedang dilaksanakan. Untuk memperbaiki kerusakan memerlukan biaya dan waktu yang cukup lama agar alat berat tersebut dapat berfungsi kembali.
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Judul: Sistem pakar untuk troubleshooting pada bulldozer model D375A-2 Komatsu : Studi kasus pada PT.United Tractors)
Abstrak: Alat berat, sekalipun hasil rekayasa teknologi tinggi tetap akan mengalami kerusakan. Kerusakan pada alat berat dapat terjadi pada sistem elektrik, sistem hidraulik dan mekanik, serta sistem monitor. Troubleshooting diperlukan untuk mencari penyebab kerusakan alat berat dan cara perbaikan kerusakan tersebut Alat berat yang dijadikan obyek penelitian adalah Bulldozer model D375A-2 Komatsu. Expert System for Troubleshooting on Bulldozer D3754-2 (ESTB D375A-2) dirancang dan dibangun untuk membantu Troubleshooting. Kerusakan pada Bulldoser D375A-2 meliputi 55 jenis kerusakan. Konsep yang digunakan dalam troubleshooting berdasarkan Shop Manual D375A-2 Komatsu. ESTB D375A-2 dibangun dengan menggunakan perangkat lunak WINEXSYS (Exsys Professional for Microsoft Window). ESTB D375A-2 dirancang sedemikian fesehingga proses troubleshooting akan berlangsung lebih cepat dan pengguna dapat dengan mudah menggunakannya. ESTB D375A-2 belum dilengkapi dengan gambar komponen-komponen Bulldozer D375A-2 dan denah rangkaian sistem elektriknya.
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Judul: Characterization of The Chemical Constituents and Antioxidant Capacity of Green and Oolong Teas (Camellia sinensis) Manufactured in Thailand
Abstrak: Tea in Thailand most manufactured in northern area, especially Chiang Rai, Chiang Mai, Nan, and Mai Hang Son province. The aim of this study was to determine and compare the chemical compositions and antioxidant capacity of 4 important Thai tea products. A total of 13 of green teas of 2 major cultivars, assamicaand cv. oolong no.12 (chin hsuan oolong) and 26 of oolong tea of 2 major varieties, cv. oolong no. 12 and cv. oolong no. 17 (chin shin oolong) were collected from 18 factories in Chiang Rai province in 2011. The total polyphenol content was determined according to International Organization for Standardization (ISO 14502-1). For antioxidant capacity, DPPH radical scavenging activitiy assay and ferric reducing antioxidant power assay were determined. The catechins content and caffeine content were determined using HPLC by ISO method (ISO-14502-2). Results showed that about 95% of the 39 tea samples manufactured in Thailand had moisture content below 7%, 5% of tea samples being above 7%. The total polyphenol content in green tea was found to vary from 11.86 to 21.19%GAE, while in oolong tea was found in a range of10.22 to 17.57%GAE. The caffeine content in green tea samples were in a range of 1.69 to 3.7%, while in oolong tea samples were in a range of 1.61 to 3.26%. The catechin content in green tea samples were in a range of 8.31-14.08%, while in oolong tea samples were in a range of 6.81-12.46%. The antioxidant capacity in green tea samples was 164.01 mmole TE/100 g dry basis, while in oolong tea samples was about 132.73mmole TE/100 g dry basis. This study provided useful information for the tea industry in Thailand and other countries in processing and selecting a good-quality tea.
Keyword: Antioxidant capacity, Camellia sinensis, Green tea, Oolong tea, Thailand