Judul: Pengembangan bambu lapis berkualitas tinggi
Abstrak: Utilization of non wood forest product such as bamboo is one of alternative in reducing wood usage. Some advantages of bamboo among other are very fast growth rate, short rotation, high tensile strength, abundantly in many countries, and traditionaly has been using as building material. The aim of this study was to produce ply bamboo that has high quality in terms of physical and bonding strength properties, and also resistance to termite attack. The raw material used in this study consisted of three bamboos species, namely, tali (Gigantochloa apus), andong (Gigantochloa verticillata) and betung (Dendrocalamus asper); and five kinds of adhesives, namely methylen diphenyl isocyanate (MDI), phenol formaldehyde (PF), melamine formaldehyde (MF), urea formaldehyde (PF) and poly vinyl acetate (PVAc). Fundamental properties of ply bamboo tested according to SNI 01-5008.7-1999. This study consisted of two topics. The aim of first study was to improve mechanical properties of ply bamboo, especially in enhanching perpendicular to grain bonding strength, and the purpose of second study was to improve resistance of ply bamboo to termite attack. The treatments applied in first topic were glue taped and sewn of bamboo strands perpendicular to grain. The distances of each treatment applied in bambo strands of both glue taped and sewn were 5 cm, 10 cm, and 15 cm, respectively; whereas the treatments applied in second topic were soaking in cold water, hot water, and boiled lime solution 5 %. The results of first topic showed that MDI was the best adhesives for ply bamboo, in terms of improving physical and bonding strength properties significantly. The results also indicated that the treatments applied in ply bamboo improved physical and bonding strength properties significantly, especialy in enhancing the perpendicular to grain bonding strength. The results of second topics showed that boiled lime solution 5 % was the best treatments for ply bamboo in improving resistance to termite attack.
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Judul: Karakteristik Bambu Lapis dari Anyaman Bambu Betung (Dendrocalamus asper) yang Direkat Menggunakan Perekat MDI dan PVAc dengan Metode Pencelupan
Abstrak: Plybamboo is an innovative product that should be improved strength and appearance to produce high quality products. The purpose of this research was to analyze the influence of adhesive type, and woven pattern toward the physical and mechanical characteristics of woven plybamboo. Water content, bonding strength, and MOR of plybamboo made using MDI adhesive is suitable with SNI 01-5008.2-2000 standard. Its water content value is under 14%, its bonding strength is more than 7 kg/cm2, and its MOR is more than 320 kg/cm2. Moreover, the water content, bonding strength, and MOR of woven bamboo made using PVAc did not suitable with SNI 01-5008.2-2000 standard. The density of plybamboo was ranged between 0.41-0.68 g/cm3. Based on shrinkage and swelling test of plybamboo, swelling phase was larger than shrinkage phase. The MOE of all samples did not suitable with SNI 01-5008.2-2000 standard. Plybamboo bonded using MDI with Tindih 2 pattern has better physical and mechanical characteristics than other plybamboos.
Keyword: PVAc, plybamboo, MDI, betung bamboo, bamboo woven

Judul: EGSnrc Monte Carlo Simulation of the Manchester System for Brachytherapy Using Multiple Radioactive Sources
Abstrak: Perhitungan dosis sistem manchester pada kanker serviks dapat dilakukan menggunakan metode monte carlo. Tujuan penelitian adalah membandingkan dan menganalisis kurva isodosis pada fantom jaringan yang diradiasi menggunakan beberapa jenis sumber radioaktif berbeda dengan sistem manchester melalui simulasi monte carlo. Jenis radioaktif yang biasa digunakan sebagai sumber radioaktif pada brakiterapi diantaranya adalah Cobalt-60, Cesium-137, dan Iridium-192. Penelitian ini menggunakan fantom homogen jaringan berukuran 10 × 10 × 10 cm^3 dan disimulasikan melalui perangkat lunak EGSnrc. Hasil penelitian didapatkkan bahwa distribusi dosis pada setiap jenis radioaktif pada titik acuan memiliki nilai yang berbeda, yaitu Cobalt-60 memiliki distribusi dosis pada titik acuan A sebesar 15,08% dengan distribusi dosis pada titik acuan B sebesar 0%, Cesium-137 adalah sebesar 13,37% dan 0%, Iridium-192 sebesar 13,27% dan 0%. Penggunaan jenis sumber radioaktif dapat disesuaikan dengan titik lokasi dan ukuran sebenarnya kanker serviks., Calculation of the Manchester system dose in cervical cancer can be done using the Monte Carlo method. The purpose of the study was to compare and analyze the isodoses curves on tissue phantoms irradiated using several different types of radioactive sources with the Manchester system through Monte Carlo simulation. The types of radioactivity commonly used as radioactive sources in brachytherapy include Cobalt-60, Cesium-137, and Iridium-192. This study used a homogeneous tissue phantom measuring 10 × 10 × 10 cm^3 and was simulated through EGSnrc software. The results showed that the dose distribution for each type of radioactive source at the reference point had different values, namely Cobalt-60 had a dose distribution at reference point A of 15.08% with a dose distribution at reference point B of 0%, Cesium-137 was 13.37% and 0%, Iridium-192 was 13.27% and 0%. The use of radioactive source types can be adjusted to the location point and actual size of cervical cancer.
Keyword: Brachytherapy, EGSnrc, Isodose Curve, Monte Carlo Simulation, Manchester System