Judul: Pengaruh Perlakuan Panas sebelum Penggorengan terhadap Kerenyahan
Abstrak: Cassava is one of the local commodities of Indonesia that can be found easily at many places. Cassava chip is one of the popular snacks in Indonesia and crispness becomes one of the important factors to measure cassava chips quality. Some efforts have been tried to enhance the crispness of cassava chip. Heating processes before frying, such as steaming and boiling, are explored whether they can help to enhance cassava chip crispness or not. Steaming and boiling can cause the cassava starch gelatinization. As a result, the starch granule swells because of water hydration. When cassava slices is fried, the water comes out and small pores formed. The pores can cause the crispness of chips. The crispness was analyzed by sensory evaluation using rating and triangle test as subjective test and physical test using texture analyzer as objective test. Proximate analysis was also done to see if there are any effects of nutrients change because of heating processes to crispness. The result showed that steaming and boiling cassava slices before frying enhanced the crispness of cassava chips. Nutrients changed because of these heating processes.
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Judul: Pengaruh Perlakuan Panas Terhadap Kerenyahan dan Warna Keripik Ubi Jalar
Abstrak: Sweet potato (Ipomoea batatas) is one of staple food which abundant in Indonesia. There are some kind of sweet potato, such as white sweet potato, yellow sweet potato, and purple sweet potato. Beside of carbohydrate and fibers, purple sweet potato has some functional character, because it contains anthocyaninas a pigment in purple sweet potato. A method to increase the value of purple sweet potato is by processing it into chips. Crispness and colour of chips are factors which are important to the quality of chips. Research on the effect of boiling and steaming to the crispness and colour of sweet potato chips will be implemented. Boiling and steaming aims to create conditions, so the slices of sweet potato gelatinization expands and becomes more crispy when fried. Some parameters which involved in steaming process need to be optimized, so the chips with the best crispness and colour are gained. The main parameters which playing role in steaming process are temperature and time. The crispness and colour of the chips will be measured objective and subjectively.
Keyword: sweet potato, steaming, crispness, colour, boiling

Judul: Solusi Geometri Schwarzschild untuk Dimensi 4+1 dengan Invarian Rotasi Isotropik
Abstrak: Metrik Schwarzschild merupakan solusi eksak pertama dari persamaan medan Einstein dengan mangasumsikan metrik statik dan simetris. Metrik Schwarzschild yang ditemukan oleh Karl Schwarzschild masih dalam dimensi 3+1, namun seiring dengan teori-teori terbaru yang menunjukkan bahwa alam semesta tidak hanya di dimensi 3+1. Maka melalui penambahan dimensi, tujuan penelitian ini memperoleh solusi pada geometri Schwarzschild untuk dimensi 4+1 dengan memodifikasi koordinat bola yang invarian rotasi isotropik dan melalui penurunan rumus seperti koordinat bola, simbol Christoffel, dan tensor Ricci. Selain mendapatkan solusi ini, metrik Schwarzschild dimensi 4+1 dapat digunakan sebagai metrik dasar untuk memperoleh solusi blackhole dan wormhole pada dimensi 4+1. Hasil akhirnya, dengan memanfaatkan modifikasi koordinat bola, metrik Schwarzschild dapat dibentuk sehingga diperoleh solusi geometri Schwarzschild untuk dimensi 4+1.
Keyword: metrik Schwarzschild, persamaan medan Einstein, modifikasi koordinat bola, penambahan dimensi, invarian rotasi isotropik