Judul: The Influence of Usage of Sweet Potato, Garut and Onggok Flour on Physical Properties and Long Storage of Broiler Feed in Pellet
Abstrak: Pellet merupakan bahan baku pakan yang telah dicampur, dikompakkan dan dicetak dengan mengeluarkan dari lubang die melalui proses mekanik. Kualitas pellet dapat ditingkatkan dengan penambahan bahan perekat pada bahan baku pakan. Penelitian ini bertujuan untuk mengetahui daya simpan pakan ayam broiler dalam bentuk pellet dengan berbagai bahan perekat dan lama penyimpanan Rancangan percobaan yang digunakan adalah rancangan faktorial dengan pola Rancangan Acak Lengkap (RAL). Faktor A adalah jenis perekat yang digunakan yaitu A1=kontrol, A2=onggok 2%, A3=tepung ubi jalar 2%, A4=tepung garut=2% dan faktor B adalah lama penyimpanan yaitu B1=0 minggu, B2=2 minggu, B3=4 minggu dan B4=6 minggu. Data yang diperoleh dari hasil penelitian dianalisis menggunakan analisis of varian (ANOVA), hasil yang signifikan diuji lanjut dengan menggunakan uji kontras orthogonal. Hasil penelitian menunjukkan bahwa jenis perekat yang digunakan sangat nyata (p<0,01) terhadap sudut tumpukan, kerapatan tumpukan dan PDI pada pellet dengan perekat onggok. Lama penyimpanan sangat nyata (p<0,01) terhadap ukuran partikel, sudut tumpukan, kerapatan pemadatan tumpukan dan ketahanan benturan pellet dan PDI. Interaksi antara jenis perekat yang digunakan dan lama penyimpanan sangat nyata (p<0,01) terhadap PDI. Selama penyimpanan enam minggu tidak ditemukan serangga pada pellet tersebut. Jenis perekat yang paling baik dapat mempertahankan kualitas pellet adalah onggok, karena pellet dengan perekat onggok paling baik dalam mempertahankan kekuatan dan kekokohan fisik pellet setelah penyimpanan selama enam minggu. Pellet dengan perekat onggok memiliki nilai tertinggi pada sifat fisik kerapatan pemadatan tumpukan (0,639±0,01 gram/ml), kerapatan tumpukan (0,57±0.01 gram/ml), ketahanan benturan pellet (94,48±3,18 %) dan PDI (83,54±12,77 %).
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Judul: Pengaruh Tepung Garut, Ubi Jalar, dan Onggok Sebagai Bahan Perekat Alami Pelet Terhadap Kualitas Fisik Pakan dan Performa Ayam Broiler
Abstrak: Binder is a substance that has the function to bind the feed component in the form of pellets so that its structure remains compact. The purpose of this research was to know the effect of addition of garut flour, sweet potato flour, and onggok as natural binder for pellet on physical quality of feed and performace of broiler chickens. Completely Randomized Design was used in this experiment, using 4 treatments and 3 replications on physical quality feed, and 4 treatments and 4 replications on performance of broiler. The treatments were R1 = control without binder, R2 = addition of onggok 2%, R3 = addition of sweet potato flour 2%, R4 = addition of garut flour 2%. The data were analyzed using Analysis of Varience (ANOVA) and significant results were further tested using Duncan’s Multiple Range Test. The results showed that addition of onggok 2% in feed influenced (P<0.05) angle of repose (26.30°) and pellet durability index (98.35%), but the treatments in terms did not influence the performance of broiler chickens. The conclusion of this experiment was that onggok 2% as binder yielded the best pellet quality of broiler chickens. The treatments did not influence the performance of broiler chickens. Addition onggok 2% as binder yielded the highest value of IOFCC (Rp. 2337.82/bird)
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Judul: Tinjauan Matematis pada Model Makroskopik dan Mikroskopik Arus Lalu-lintas
Abstrak: Traffic flow phenomenon can be described through mathematical model such as continuous dynamic model with an ordinary differential equation so that it can be solved with integral factors. In this paper three simple models of traffic flow are discussed, i.e, two macroscopic and one microscopic models. Macroscopic model formulates dynamics of the traffic flow that occurs on a large number of vehicles on a road. While the microscopic model explains drivers’ behavior in their interaction with other vehicles ahead, i.e, car-following model. This paper shows the existence of ordinary differential equation found in the traffic flow model and indicates some different representations in the context of the same model. It also reviews a simple model of traffic flow along a single link, which leads to some unexpected results, i.e, it can express the solution model in term of link outflows as well as trip time. In the microscopic model, simulation is done to illustrate the behavior of the drivers with a sensitivity coefficient as a benchmark parameter.
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