Judul: Pengaruh tepung daun lamtoro (Leucanea leucocephala) dan mimosin murni terhadap alat  reproduksi dan produksi ayam petelur
Abstrak: Tujuan penelitian ini ialah untuk menentukan jumlah optimal tepung daun lamtoro di dalam pakan ayam. Selain itu untuk mengetahui pengaruh tepung daun lamtoro terhadap struktur alat reproduksi dan produksi telur. Tujuan selanjutnya yaitu untuk mengetahui peranan mimosin sebagai penyebab perubahan struktur alat repro duksi dan produksi telur. Percobaan yang dilakukan mempergunakan hewan uji berupa ayam Leghorn putih strain Hyline W 36, berasal dari PT. Hidon, Bogor.
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Judul: Pengaruh tingkat pemberian tepung daun lamtoro ( Leucaena leucochepala ) terhadap konsumsi energi metabolis, protein kasar, persentase bulu dan penampilan produksi ayam petelur tipe ringan pada periode pertumbuhan
Abstrak: Penelitian dilakukan di Jalan Raya Cigombong-Ciburuy No. 490, Ciawi, Kabupaten Bogor, dari tanggal 9 April sam- pai dengan tanggal 15 Juli 1984. Tujuan penelitian adalah untuk mengetahui pengaruh penggunaan tepung daun lamtoro terhadap konsumsi energi metabolis, protein kasar, persentase bulu dan penampilan produksi yang mencakup pertumbuhan, konsumsi ransum dan koefisien ekskreta. Analisa data menggunakan Rancangan Blok Acak Lengkap dan Rancangan Acak Lengkap. Untuk menen- tukan koefisien ekskreta digunakan indikator internal sili- kat yang terdapat dalam ransum dan ekskreta. Sebagai materi percobaan digunakan 160 ekor ayam dara petelur Leghorn Putih strain W36 yang berasal dari P.T. Hidon, Caringin, Kabupaten Bogor. Perlakuan yang diberikan adalah tingkat pemberian te- pung daun lamtoro 0. 5, 10 dan 20 persen. Peubah yang di- ukur adalah bobot badan, energi bruto dan protein kasar ransum dan ekskreta, kadar silikat ransum dan ekskreta, konsumsi ransum serta bobot bulu. Hasil penelitian menunjukkan konsumsi energi metabolis, konsumsi protein kasar, konsumsi ransum dan pertumbunan Derbeda sangat nyata (P40.01) antara tiap perlakuan. hon- sumsi energi metabolis, konsumsi protein kasar, konsumsi ransum dan pertumbuhan kelompok ayam yang mendapat 0, 5 dan 10 persen tepung daun lamtoro lebih tinggi dari kelompok ayam yang mendapat 20 persen tepung daun lamtoro. Sedang- kan antara perlakuan 0, 5 dan 10 persen pemberian tepung daun lamtoro tidak terdapat perbedaan. Penggunaan energi metabolis untuk hidup pokok dan pertumbuhan pada tingkat pemberian 3, 5, 10 dan 20 persen masing-masing mengikuti persamaan...
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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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