Judul: Karakteristik Fermentasi Rumen Domba secara In Vitro dengan Pemberian Daun dan Umbi Ubi Jalar yang Berbeda Proporsi.
Abstrak: Penelitian ini bertujuan menganalisis penggunaan konsentrat ubi jalar yang paling efektif terhadap kinerja rumen dengan proporsi daun dan umbi ubi jalar yang berbeda. Rancangan percobaan penelitian ini adalah rancangan acak kelompok dengan 5 perlakuan dan 4 kelompok. Perlakuannya berupa penambahan daun dan umbi ubi jalar yang berbeda proporsi, yaitu P0=60% daun ubi + 40% umbi, P1=65% daun ubi + 35% umbi, P2 = 70% daun ubi + 30% umbi, P3 = 75% daun ubi + 25% umbi, P4 = 80% daun ubi + 20% umbi dan pengelompokan dilakukan berdasarkan cairan rumen yang berasal dari 2 domba untuk setiap ulangan. Data dianalisis menggunakan ANOVA, dan uji perbandingan berganda Duncan. Hasil penelitian menunjukkan bahwa penggunaan proporsi 80% daun umbi dan 20% umbi, mampu meningkatkan kecernaan bahan kering, kecernaan bahan organik, konsentrasi NH3, populasi bakteri serta menurunkan populasi protozoa dan konsentrasi VFA secara signifikan tetapi tidak signifikan terhadap pH rumen. Hal ini menunjukan bahwa penggunaan proporsi 80% daun umbi dan 20% umbi mampu meningkatkan fermentabilitas rumen domba.
Keyword: in vitro, karakteristik fermentasi rumen, kecernaan bahan kering dan organik, populasi mikroba rumen, ubi jalar

Judul: Kajian In Vitro Karakteristik Fermentasi Rumen Domba Ekor Tipis Yang Diberi Biomassa Ubi Jalar (Ipomoea Batatas L)
Abstrak: Kendala utama peternakan domba adalah ketersediaan dan kualitas pakan. Potensi sumberdaya lokal yang dapat dimanfaatkan adalah biomassa ubi jalar. Daun dan batang ubi jalar dapat dijadikan sebagai sumber protein dan umbinya dapat dijadikan sumber energi. Penelitian ini bertujuan menganalisa efek pemberian biomassa ubi jalar terhadap karakteristik fermentasi rumen, kecernaan bahan kering dan bahan organik, populasi protozoa serta bakteri secara in vitro. Penelitian ini menggunakan rancangan acak kelompok dengan 4 perlakuan dan 3 ulangan. Perlakuannya adalah P0=100% rumput gajah, P1=70% rumput gajah+30% konsentrat, P2=50% rumput gajah+50% daun dan batang ubi, dan P3=70% daun dan batang ubi+30% umbi ubi jalar. Hasil penelitian menunjukkan bahwa perlakuan P3 memiliki kecernaan bahan kering dan bahan organik, NH3, VFA, serta populasi bakteri yang paling tinggi dibandingkan dengan perlakuan lainnya. Perlakuan 100% rumput gajah belum dapat memenuhi kebutuhan nutrisi. Disimpulkan bahwa biomassa ubi jalar dapat digunakan sebagai salah satu pakan alternatif yang menjanjikan untuk domba.
Keyword: karakteristik fermentasi rumen, bakteri, protozoa, ubi jalar

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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