Judul: Uji Kualitas Sifat Fisik dan Daya Simpan Pellet yang Mengandung Klobot Jagung dan Limbah Tanaman Ubi Jalar sebagai Substitusi Daun Rumput Gajah.
Abstrak: This study aims measured the quality of the physical properties and storage period of pellet. Food resources in the form of pellet with corn husk and sweet potato by-product as a substitute for the Pennisetum purpureum leaves. Model experiments used a Completely Randomized Design with (4x4) factorial and 4 replicates. The first factor was the rate of substitution consist of R0 (18% Pennisetum purpureum leaves + 82% concentrate), R1 (12% Pennisetum purpureum leaves + 3% corn husk + 3% sweet potato by-product + 82% concentrate), R2 (6% Pennisetum purpureum leaves + 6% corn husk + 6% sweet potato by-product + 82% concentrate), R3 (9% corn husk + 9% sweet potato by-product + 82% concentrate). The second factor was the storage period consist of Q1 (0 weeks), Q2 (2 weeks), Q3 (4 weeks) and Q4 (6 weeks) with four replications. The variables observed were water content (%), density (gr/cm3), loose bulk density (gr/cm3), compacted bulk density (gr/cm3), single of repose (), water activity, particle size (mm) and pellet durability index (%). Data were analyzed by analysis of variance and significant results with orthogonal contrast test. The results showed that corn husk and sweet potato by-product as a substitute for the Pennisetum purpureum leaves and storage period of significant effect (P<0.01). Differences of each level of substitution affecting for water content, water activity, particle size, angle of repose and loose bulk density. Interaction of two factors were significant effect (P< 0.01). According to change of pellet water activity, the best results from first factor were R1. While the second factor as good as the rations not stored more than 2 weeks.
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Judul: Uji kualitas sifat fisik dan daya simpan pellet yang mengandung Klobot Jagung dan limbah tanaman Ubi Jalar sebagai substitusi daun Rumput Gajah
Abstrak: Penelitian ini bertujuan untuk mengukur kualitas sifat fisik dan daya simpan pellet ransum komplit sehingga dapat dikaji efektivitas penyimpanan pellet. Sumber pakan hijauan pellet berupa kulit jagung (klobot) dan limbah tanaman ubi jalar sebagai pengganti daun rumput gajah. Model percobaan adalah Rancangan Acak Lengkap dengan pola faktorial (4x4) dengan 4 ulangan. Faktor pertama adalah taraf substitusi dari klobot jagung dan limbah tanaman ubi jalar terhadap daun rumput gajah yaitu R0 = daun rumput gajah 18% + konsentrat 82%, R1 = daun rumput gajah 12% + klobot jagung 3% + limbah tanaman ubi jalar 3% + konsentrat 82%, R2 = daun rumput gajah 6% + klobot jagung 6% + limbah tanaman ubi jalar 6% + konsentrat 82%, R3 = klobot jagung 9% + limbah tanaman ubi jalar 9% + konsentrat 82%, dan faktor kedua adalah lama penyimpanan (0, 2, 4 dan 6 minggu) dengan empat ulangan. Peubah yang diamati adalah kadar air (%), berat jenis (gr/cm3), kerapatan tumpukan (gr/cm3), kerapatan pemadatan tumpukan (gr/cm3), sudut tumpukan (), aktivitas air, ukuran partikel (mm) dan ketahanan pellet terhadap gesekan (%). Data yang terkumpul dianalisis dengan sidik ragam ANOVA dan jika berbeda nyata dilanjutkan dengan uji kontras ortogonal, dst
Keyword: Institut Pertanian Bogor, IPB, Corn husk, Pennisetum purpureum leaves, Storage period, Sweet potato by-product

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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