Judul: Sifat dan Kualitas Fisik Daun Torbangun (Coleus amboinicus Lour.) yang Diproses Menjadi Pellet
Abstrak: Physical characteristics of ration are important aspects in feed mill industry, because they are related to handling efficiency, processing and storage. Torbangun plant in Indonesia has not used for animal feed. The process of drying and processing plants as feed ingredients affect the moisture content. This study aims to determine the physical properties of plant leaves torbangun and the influence on physical pellet quality in particular due to different moisture content of materials (12%, 13.5%, 15%) prior to pelleting process. The experimental design used was a completely randomized design with 3 treatments and 4 replications. The experimental data were analyzed using analysis of variance (ANOVA), the different among treatments were further tested using Duncan Test. The parameters observed were pellet durability index, spesific gravity, bulk density, compacted bulk density, angle of respone and moisture content of pellet. Different moisture content of torbangun level significantly affect (P <0.05) the bulk density, compact bulk density, angel of heap, and pellet durability index, however do not significantly (P> 0.05) affect the specific gravity.
Keyword: Torbangun, physical characteristics, pellet, moisture content

Judul: Pengaruh Proses Pelleting Terhadap Kelarutan dan Aktivitas Anti Bakteri Daun Torbangun (Coleus amboinicus Lour)
Abstrak: Torbangun (Coleus amboinicus Lour) is a herb that can be used as feed supplement. Processing torbangun into pellets is one of the way to keep the nutritional content to not easily damaged, improve efficiency and can be saved. The purpose of this research was to study the effect of processing plants into pellets with different water content on the solubility and antibacterial activity of torbangun (Coleus amboinicus Lour). The experimental design of this study used a Completely Randomized Design (CRD) of 3 treatments, which were P1 (12%), P2 (13.5%), and P3 (15%) with 3 replications. The variables measured were solubility and anti-bacterial Bacillus subtilis, Staphylococcus aureus, Escherichia coli and Salmonella typhimurium. The results showed that the pelleting process lowered the value of the solubility and antibacterial activity in torbangun. Different levels of water content had no effect on the solubility, while the antibacterial activity showed different result depending on the type of bacteria because each bacteria react differently.
Keyword: torbangun., test the inhibition of bacterial, solubility test

Judul: Persamaan Geodesik Black Hole dengan Metrik Kerr 4+1 Dimensi dalam Koordinat Waktu Kosmik
Abstrak: Persamaan geodesik black hole dengan metrik Kerr 4+1 dimensi dalam koordinat waktu kosmik merupakan interpretasi lain dari persamaan geodesik black hole dengan metrik Kerr 4+1 dimensi, dimana acuan waktu yang digunakan diubah dari koordinat waktu wajar (proper time) ke dalam koordinat waktu kosmik (cosmic time). Waktu kosmik merupakan koordinat waktu yang dimana pengamat bergerak mengikuti ekspansi dari alam semesta. Penelitian ini merekonstruksi persamaan geodesik black hole dengan metrik Kerr 4+1 dimensi yang telah ditemukan pada penelitian sebelumnya menjadi persamaan geodesik yang memiliki fungsi terhadap dimensi waktu (t). Hasil akhir dari transformasi persamaan dapat digunakan sebagai bahan studi pustaka untuk penelitian lebih lanjut mengenai persamaan geodesik black hole dalam koordinat waktu kosmik.
Keyword: Dimensi ekstra, Metrik Kerr, Persamaan geodesik, Waktu kosmik