Judul: Pengaruh substitusi jagung dengan sorgum dan menir sebagai sumber pati terhadap kualitas fisik pelet pakan broiler finisher
Abstrak: The objectiv es of this research was to evaluate different starch source in broiler ration on the physical pellet quality in continous process. This research was designed by a Completely Randomized Design with three treatments and three replicates. The treatments were P1: ration with 45% corn, P2 : ration with 35% corn + 10% shorgum, P3 : ration with 35% corn + 10% broken rice. The data were analyzed using ANOVA and significance results were analyzed by orthogonal contrast test. The parameters observed : moisture conte nt, particle size, pellet durability, and shatter test. The result showed that different starch source did not influence the particle size showed variation 6.50 mm to 6.69 mm, pellet durability showed variation 84.73% to 89.38%, shatter test showed variation 95.33% to 97.67%, but the treatments gave a very significant effect (p<0.01) on moisture content with variation 9.93% to 12.26%.
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Judul: Kualitas Fisik Pellet Ransum Broiler Mengandung Bahan dengan Ukuran Partikel yang Berbeda pada Proses Produksi Berkesinambungan
Abstrak: Feed grinding is one of feed processing undertaken to reduce feed ingredient particle size enabling improvement of mixing characteristics of the ingredients and increase pelleting efficiency and pellet quality. The objective of this research was to study the effect of different particle size on the physical pellet quality of the broiler diets. This research was designed by a completely randomized design with three treatments and three replication. The treatments were ground corn and soyabean meal with 2, 3, and 5 mm screen size for treatment P1, P2, and P3 respectively. Data obtained were analyzed with descriptif analysis for moisture content, shrink and production time, while the physical properties of broiler diet were analyzed by the analysis of variance (ANOVA) and any significant results were futher analyzed by contrast orthogonal test. The result show that particle size significantly (p<0.05) on pellet floating velocity, pellet angle of repose, mash and pellet specific density and pellet compacted density. However, particle size did not give significant effect on mash and pellet specific gravity, mash floating velocity, mash angle of repose and mash compacted density. The result of research show that the production time range from 64.6-76.3 minutes, total of shrink range from 4.51-8.85 % and pellet temperature range from 35-410C, 40-480C and 42-480C after cooling process during 30, 40 and 50 minutes respectively.
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Judul: Invers Drazin dari Matriks Toeplitz Singular
Abstrak: Matriks Toeplitz adalah matriks yang setiap unsur pada diagonal utama bernilai sama dan setiap unsur pada subdiagonal yang bersesuaian dengan diagonal utama juga bernilai sama. Matriks singular adalah matriks yang tidak bisa ditentukan inversnya. Akan tetapi, dapat diupayakan untuk ditentukan inversnya menggunakan invers matriks yang diperumum. Invers Drazin merupakan salah satu jenis invers matriks yang diperumum. Pada karya ilmiah ini ditentukan invers Drazin dari matriks Toeplitz singular dengan menggunakan metode Leverrier Faddeev. Kemudian, ditentukan invers Drazin dari matriks Toeplitz singular yang direpresentasikan sebagai penjumlahan segitiga bawah dan segitiga atas matriks Toeplitz berdasar pada teorema Gohberg dan Semencul., Toeplitz matrix is a matrix in with element on the main diagonal has the same value and on the subdiagonal corresponding to the main diagonal also has the same value. Singular matrix is a matrix that has no inverse. However, it can be attempted to determine the inverse using a generalized inverse matrix. Inverse Drazin is a type of generalized matrix inverse. This paper discussed the inverse Drazin for a singular Toeplitz matrix using the Leverrier Faddeev method. Then, the Drazin inverse of the singular Toeplitz matrix which is represented as a sum of products of lower and upper triangular Toeplitz matrix based on Gohberg and Semencul theorem.
Keyword: inverse Drazine, singular Toeplitz matrix