Judul: Uji kualitas silase singkong utuh (Manihot esculenta) dengan beda umur panen secara in vitro sebagai upaya peningkatan pemanfaatan pakan lokal
Abstrak: A study to evaluate whole cassava crop silage quality at several age of harvesting compared to total mixed ration have been done. Two kg of well mixed sample of whole crop cassava at 7 month (SSU7), 8 month (SSU8), 9 month (SSU9) of harvesting and sample of total mixed ration (SRK) were ensiled for 5 weeks anaerobically in 35 cm x 50 cm polyvinyl bags silo. Comparison of the silages qualities were based on physical (color, smell, humidity, texture and presence of moulds), fermentative (pH, DM, VFA, DM losses, CP, N-NH3, degradation of CP, WSC, HCN, and fleigh number) and utilities (in vitro rumen fermentability and digestibilities) characteristics. The treatments were completely randomized and each treatment was repeated thrice. Physical, fermentative and utilities characteristics of whole cassava crop silage made from cassava crops harvested at 7, 8, and 9 months of age were comparable to the total mixed ration silage or even better. The best whole crop cassava silage quality was produced from SSU8 (better physical characteristics, higher fleigh number, and digestibilities). However, because of nutritional contents of whole cassava crop were changed with age, therefore the silage utilization should consider animal requirement and its level of inclusion.
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Judul: Studi Lama Penyimpanan terhadap Kualitas Nutrien Onggok Fermentasi (Cassabio)
Abstrak: Cassava pulp can be used for animal feed as an alternative feed source, but it must be processed first prior to use such as through fermentation technology. The fermented product is called cassabio. Cassabio that is produced in a big scale will not be directly fed to the livestock, but it has to be storage first for some time. This study was aimed to determine the effect of storage time on the quality of cassabio. Cassabio storage was done in plastic bags, conducted over 3 months under room temperature and humidity. The treatment used was storage time (0, 2, 4, 6, 8, 10, and 12 weeks) with 4 replications. The design of this study was based on a completely randomized design. Results showed that cassabio storage for 12 weeks significantly lowered DM and NFE. Crude fat content during the storage period significantly increased up to 6 weeks, and decreased afterwards. Storage period also gave a significant effect on crude protein to form a linear curve andincreased crude fiber content, while the storage priod did not affect ash content and pH of cassabio.
Keyword: storage, quality, cassabio

Judul: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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