Judul: Substitusi Rumput Gajah dengan Limbah Tauge dalam Ransum Bentuk Pellet terhadap Performa dan Nilai Komersil Kelinci Jantan Lokal persilangan.
Abstrak: Alternative feed rations to reduce the use of commercial waste are sprouts. This study aimed to compare the performance of local male rabbits fed by complete sprouts waste pellet shaped to substitute the use of elephant grass. This study used a completely randomized design with 4 treatments and 4 repetitions. There were 16 local male rabbits aged 2 months with an average live weight 879.375 + 60.874 g head-1. Treatments consisted of P0 = 15 % of elephant grass + 85 % of concentrate, P1 = 10 % elephant grass + 5 % of sprouts waste + 85 % concentrate, P2 = 5 % of elephant grass + 10 % sprouts waste + 85 % concentrate, P3 = 15 % of sprouts waste + 85 % concentrate. Data were analyzed by analysis of variance (ANOVA). The results showed that the use of waste to the extended 15 % of sprouts waste pellets could substitute the usage of elephant grass and reduce the price of feed to give a good performance on the local male rabbits. Daily weight gain of rabbits given pellet P2 and P3 is 18.954 to 19.785 g day-1 with a final body weight greater than P0 and P1. The highest pellet consumption is the treatment of P2 and P1, the consumption of P3 pellet treatment is not too high and shows the average final body weight better than others. It also could decrease the cost.
Keyword: sprouts waste., performance, Pennisetum purpureum, pellets, local male rabbits

Judul: Pengaruh Taraf Kombinasi Rumput Gajah dan Limbah Tauge sebagai Alternatif Sumber Serat terhadap Kualitas Fisik Pellet Kelinci Selama Penyimpanan.
Abstrak: Sprouts waste (SW) is an alternative materials which potentially replace elephant grass (EG) as a source of fiber on feed. This study aims to test the physical quality of pellets for rabbit which contains SW and EG as a source of fiber with different storage periods. This study was arranged in a Completely Randomized Design Factorial (4x4), contains factor A: sprouts waste levels (P0 = 15% EG + 85% concentrate, P1 = 10% EG + 5% SW + 85% concentrate, P2 = 5% EG + 10% SW + 85% concentrate, and P3 = 15% SW + 85% concentrate), and factor B: storage periods (0, 2, 4, 6 weeks). Data were analyzed with analysis of variance (ANOVA) and followed by Duncan test. The results indicated that the combination level of SW and EG very significantly increased the particle size, durability, and also decreased the bulk density and compacted bulk density (P<0.01). P2 showed the best physical quality because it had a high particle size, required medium storage space with the highest durability and decreased feed price. The storage periods very significantly decreased the physical quality of pellets (P<0.01). In this study, there was an interaction between treatments on spesific density and bulk density
Keyword: Bogor Agricultural University (IPB), storage, sprouts waste, physical quality

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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