Judul: Pengaruh penambahan tepung gaplek sebagai perekat terhadap sifat fisik ransum broiler bentuk pellet
Abstrak: Pellet adalah bentuk ransum yang banyak diproduksi pada pabrik pakan. Kendala pemakaian ransum bentuk ini adalah terjadinya kerusakan bentuk fisik atau hancur selama proses pembuatan dan pengangkutan. Penggunaan bahan perekat untuk mempertahankan kualitas ransum secara fisik sangat diperlukan. Perekat alami yang dapat digunakan adalah tepung gaplek. Tepung gaplek terbuat dari ubi kayu dan banyak mengandung pati. Pati tepung gaplek ini menyebabkan terjadinya proses gelatinisasi sehingga ransum yang dihasilkan menjadi lebih padat dan tidak mudah hancur. Penelitian ini bertujuan untuk mengetahui pengaruh penambahan tepung gaplek sebagai perekat terhadap uji sifat fisik ransum broiler bentuk pellet. Rancangan percobaan yang digunakan adalah Rancangan Acak Lengkap dengan 4 perlakuan 3 ulangan. Perlakuan terdiri dari ransum + 0% gaplek (A1), ransum + 2% gaplek (A2), ransum + 4% gaplek (A3) dan ransum + 6% gaplek (A4). Peubah yang diamati adalah: kadar kehalusan, ukuran partikel, kadar air, berat jenis, kerapatan tumpukan, kerapatan pemadatan tumpukan, sudut tumpukan dan ketahanan benturan. Hasil penelitian menunjukkan bahwa penambahan perekat gaplek sampai taraf 6% sangat nyata meningkatkan kadar kehalusan, ukuran partikel, kerapatan pemadatan tumpukan, ketahanan benturan, sangat nyata menurunkan kadar air dan sudut tumpukan tetapi tidak mempengaruhi berat jenis dan kerapatan tumpukan pellet penelitian.
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Judul: Penggunaan Perekat Bentonite dengan Level Berbeda pada Pelet Ransum Ayam Broiler
Abstrak: Penelitian ini dilakukan untuk mengkaji pengaruh penambahan level bentonite terhadap komponen proksimat dan sifat fisik pakan ayam bentuk pelet. Penelitian ini menggunakan rancangan acak lengkap (RAL) dengan 5 perlakuan dan 4 ulangan. Metode yang digunakan adalah Rancangan Acak Lengkap (RAL) yaitu: P0 (ransum basal), P1 (ransum basal + 2% bentonite), P2 (ransum basal + 4% bentonite), P3 (ransum basal + 6% bentonite), P4 (ransum basal + 8% bentonite). Variabel yang diamati adalah komponen proksimat dan sifat fisik pelet. Data dianalisis dengan analysis of variance (ANOVA) dan apabila hasil menunjukkan berbeda nyata maka dilanjutkan dengan uji Duncan. Hasil penelitian menunjukkan bahwa pemberian bentonite dapat mengubah komponen proksimat yaitu menurunkan kadar air dan meningkatkan kadar abu. Pemberian 2 − 4% bentonite berpengaruh nyata (P<0,05) terhadap kualitas fisik meliputi berat jenis, ketahanan, dan kekerasan pelet. Dapat disimpulkan bahwa penambahan bentonite menghasilkan sifat fisik terbaik pada level pemberian 2%., This research was intended to examine the effect of increasing bentonite levels on the proximate composition and physical properties of chicken feed pellets. This research was conducted by implementing a Completely Randomized Design (CRD) with 5 treatments and 4 replications. The method used in this research was Completely Randomized Design (CRD), specifically: P0 (basal ration), P1 (basal ration + 2% bentonite), P2 (basal ration + 4% bentonite), P3 (basal ration + 6% bentonite), P4 (basal ration + 8% bentonite). The variables observed were the proximate composition and physical properties of the pellets. Subsequently, the data were analyzed by utilizing analysis of variance (ANOVA) and would be continued with Duncan’s test if the results show a significant difference. The result showed that the bentonite could alter the proximate components by lowering the moisture content and increasing the ash content. The administration of 2 – 4% bentonite was able to provide a significant effect (P<0.05) on physical quality, including the density, durability, and hardness of the pellets. Therefore, it can be concluded that the bentonite addition was capable of producing the finest physical properties at the 2% level of administration.
Keyword: additive, bentonite, pellet, adhesive, physical properties

Judul: Thermal Characteristics and Dynamics of Tropical Cyclone over Western North Pacific Ocean: A Case Study of Typhoon Songda (Chedeng) 2011
Abstrak: The frequent occasion of Tropical Cyclone (TC) over Western North Pacific (WNP) Ocean lies from 10˚N to 26˚N and 121˚E to 170˚E. Sources of TC development come from warm ocean temperature where latent heat is released during condensation processes and subsequently concentrated in the boundary layer. Relative humidity at 850-700 hPa is responsible to produce the most intense storm. Meanwhile, weak vertical wind shear between 850-200 hPa is one of the dynamical factors that lead to the development of TC. Pressure level of 850-200 hPa is chosen to minimize the thermodynamic effect in the lower troposphere. Typhoon Songda (Chedeng in the Philippines) or TSC lasted from May 18th to 30th, 2011 and strengthened into powerful Super Typhoon stage between May 24th and 27th. Long curving track and the exhibition of all sequences of TC life cycle, TSC is then considered as an ideal case of TC. The objective of the study with case of TSC is to investigate the role of thermal characteristics and dynamics on TC intensity. The research is carried out by using Advanced Research of Weather Research and Forecasting model (WRF ARW model) version 3.3. Two domains are employed in the model. The first domain situate from 02˚N to 40˚N and 118˚E to 149˚E and cover spatial resolution () of 33.1 km. The second domain situate from 09˚N to 27˚N and 119˚E to 132˚E with of 11 km. Timestep of the model () is 120 seconds. The model is supported by the following physical parameterization, i.e., Yonsei University Scheme (YSU) in the boundary layer, Kain-Fritsch scheme (KF) in the cumulus, and WRF Single-Moment 3-class scheme in the microphysics. Initial meteorological condition prior to the formation of the cyclone is generated using WRF ARW standard-release model. Sensitivity of the model output is obtained from a selected single-parameter change scenarios, namely, 10 % to 20 % decrease and increase of wind shear initial data at 850-200 hPa, and by 10 % to 20 % decrease of relative humidity initial data at 850-700 hPa. The result showed that the negative correlations between wind shear and intensity are found in wind shear scenarios. Wind shears of 10 ms-1 which lead to strengthening of the wind intensity in the early period of Typhoon development are found in wind shear scenarios. The effect of wind shear changes on wind intensity is statistically significant in the 20 % wind shear scenarios. During mature stage, weak wind intensity occurred when wind shear increase as given in the WRF standard-release and the 20 % decreasing scenario. Different situation is found in the 20 % increasing scenario where wind shear tend to weak and lead to strong wind intensity at this stage. Meanwhile, the reduction of moisture supply at 850-700 hPa resulting from 20 % decreasing relative humidity play a major role in the weakening of wind intensity and reduces mechanical energy of the cycle process as much as 300 J kg-1.
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