Judul: Pendugaan kandungan nutrien dedak padi berdasarkan karakteristik fisik
Abstrak: Rice bran is a feedstuffs widely used for both ruminants and non ruminants. The main problem of using rice bran as feedstuff is adulteration that quite often exists during dry season. Therefore, application of rapid test technique is essential to assess the quality of rice bran quickly. The aim of this study was to predict nutrient content of rice bran through measuring its physical characteristics. Twenty one standard samples made from mixture combination of 0-100% husk and rice bran were analyzed their chemical composition (proximate analysis) and physical characteristics (density test, density compaction test, total solubility test and fluoroglucinol test). The data were analysed with the least square method of regression, and the equations obtained were then validated on 61 rice bran samples to know standard of prediction (SEP) and coefficient variable (CV) values. There were correlations (P< 0.05) between physical characteristics and nutrient content of rice bran. The content of ash, crude protein, crude fibre, and crude fat could be predict with total solubility equation y (ash) = 28.81-0.624x (total solubility), y (crude protein) = - 5.012+ 0.657x, y (crude fibre) = 72.31- 2.058x, and y (crude fat) = -10.42 + 0.982x. The SEP and CV values from those equations are respectively 2.52%, and 23,62%; 2.53% and 23.50%; 8.20% and 56.91%; and also 3.80% and 35.49%. Fluoroglucinol test could also be used to predict crude protein with the equation y (crude protein )= 12.86 - 0.1046x (prediction of rice husk), with CV and level of acceptance (0.05%) were 19.13% and 28.57%. Multiple regression model showed that crude protein could be predict with the equation y (crude protein)= -3.03 + 9.4x1 – 9.9x2 + 0.629x3, r = 0.994 with x1 was density test, x2 was density compaction test, and x3 was total solubility test with SEP and CV value 2.26% and 20.99%. It is concluded that chemical composition of rice bran could be predict by measuring total solubility especially for ash and crude protein, while fluoroglucinol test and multiple regression of physical test was capable of predicting crude protein of rice bran.
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Judul: Quality Evaluation of Rice Bran based on Physical Properties and Prediction of Chemical Composition in Maros District, South Sulawesi
Abstrak: Dedak padi merupakan hasil ikutan proses penggilingan padi yang dimanfaatkan sebagai penyusun ransum ternak. Kualitas dedak padi dapat beragam tiap daerah penghasilnya. Penelitian ini bertujuan mengkaji kualitas dedak padi berdasarkan sifat fisik dan pendugaan komposisi kimia di Kabupaten Maros. Penelitian ini menggunakan rancangan acak lengkap (RAL) dengan 10 perlakuan dan 4 ulangan. Data yang diperoleh dianalisis menggunakan analysis of variance (ANOVA) dan dilanjutkan uji Duncan. Hasil ANOVA menunjukkan bahwa sifat fisik dedak padi berupa kerapatan tumpukan, kerapatan pemadatan tumpukan, dan berat jenis berbeda sangat nyata (P<0,01) antar desa. Kualitas fisik dedak padi pada sepuluh pabrik (desa), lima kecamatan di Kabupaten Maros bervariasi dari yang tertinggi (KT 351,88 kg m-3; KPT 513,54 kg m-3) hingga terendah (KT 266,79 kg m-3; KPT 398,56 kg m-3). Dedak padi pabrik (desa) Allatengae memiliki kualitas terbaik. Kualitas dedak padi dapat ditentukan dengan cara mengukur kerapatan tumpukan (KT) dan kerapatan pemadatan tumpukan (KPT). Dedak padi hasil penelitian tergolong dalam kualitas I, II, III SNI (2013)., Rice bran is a byproduct of the rice milling process, commonly used for livestock feed ingredients. The rice bran quality can be various in each producing regions. This research aimed to evaluate the quality of rice bran based on physical properties and prediction of chemical composition in Maros district. The experimental design used in this study was completely randomized design with 10 treatments and 4 replications. The data obtained were analyzed using analysis of variance (ANOVA) and continued with Duncan's test. The results showed that bulk density, compact bulk density and true density had highly significant (P<0,01) in each mill (village). Physical quality of rice bran from ten mill (village), five sub-district in Maros District was various from the highest (BD 351,88 kg m-3; CBD 513,54 kg m-3) to the lowest (BD 266,79 kg m-3; CBD 398,56 kg m-3). Rice bran of Allatengae mill (village) has the best quality. The quality of rice bran can be determined by measuring bulk density (BD) and compacted bulk density (CBD). Rice bran in this study was classified as I, II and III quality of SNI (2013).
Keyword: Maros district, physical quality, rice bran

Judul: Formulasi Hamiltonian untuk Menggambarkan Gerak Gelombang Soliter Dimensi Tiga di Permukaan Laut
Abstrak: Gelombang permukaan adalah gelombang yang terjadi perbedaan rapat massa antara air dan udara. Salah satu gelombang permukaan yang ditinjau adalah gelombang soliter. Formulasi gelombang soliter dilakukan dengan menggunakan formulasi Hamiltonian.
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