Judul: Karakteristik Kerenyahan Pilus dari Dua Tepung Tapioka
Abstrak: Quality of a product is one of the most important aspects to determine consumer’s acceptance. Final product quality closely related to the quality of raw materials used. Garudafood as one of the leading food and beverage companies in Indonesia, has pilus as its main snack product. Pilus is a fried round-shaped snack made from tapioca with a mixture of other spices, ready to be consumed as a snack or side dish companion. Pilus is supposed to has a crispy texture. Garudafood needs 2000 tons of tapioca for pilus production per month. However, this necessity could not be filled with a consistent quality of the material supply. Thus, characterise the tapioca used in production to determine the test parameters that can predict pilus crispness need to be done. The parameters tested are analysis of starch level, amylose, amylopectin, swelling power, starch gelatinization profiles, texture analyzer, and organoleptic test. Moreover, the test be repeated at each arrival tapioca to see the consistency of raw materials quality. The research showed that most relevant tests to specify pilus crispness are the ratio of amylose amylopectin and peak viscosity on starch gelatinization profiles. In addition, the data indicates that the quality of raw materials used are not consistent.
Keyword: tapioca, starch, pilus, amylose, Bogor Agricultural University (IPB)

Judul: Pembuatan Tepung Tapioka dengan Pengering Semprot dan Pengering Kabinet serta Aplikasinya pada Produk Pilus di PT Garudafood Putra Putri Jaya
Abstrak: Tapioca produced by means of modern method is not suitable for making of pilus. Pilus which is produced by using the so called “modern tapioca” will have a hard texture and not fluffy. Traditional tapioca flour is made with a long time to get a distinctive taste. However, traditional process of tapioca production could not be applied in large production scale. Therefore, experiments were conducted to produce tapioca starch of industrial scale by means of spray drying and cabinet drying process. During drying with spray dryer, three inlet temperature levels in range 140-160 °C, 170-190 °C, 200-220 °C were applied, whereas during drying with cabinet dryer, three levels of temperature in range 40-60 °C, 60-70 °C, 70-90 °C and three levels of drying time 0.75 hour, 1.5 hours, 2.5 hours were applied. The starch properties analysed were tapioca starch yield, moisture content, whiteness, fineness and gelatinization pattern of starch. The tapioca starch obtained will be applied in manufacturing of “pilus”. The characteristics of “pilus” evaluated is crispiness.
Keyword: pilus., cabinet drying, spray drying, tapioca

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