Judul: Beberapa aspek statistika fungsi pertumbuhan ayam pedaging yang menerima beberap perlakuan
Abstrak: Tujuan penelitian ini ialah (1) mereduksi 24 kombinasi perlakuan berdasarkan penganalisaan serempak terhadap peubah respons gandanya, dan (2) menentukan fungsi pertumbuhan dan fungsi konsumsi untuk kelompok kelompok perlakuan yang diperoleh pada butir (1) di atas. Sebagai bahan percobaan adalah anak ayam pedaging umur dua minggu, strain Tatum dan Tegel dengan jenis kelamin jantan dan betina. Satuan percobaan berupa kandang-kandang yang berukuran 1m x 1m, dengan sistim lantai kandang kotak dan sistim lantai kandang "litter". Perlakuan merupa- kan kombinasi perlakuan dari empat faktor, yaitu Faktorial Lengkap 3x2x2x2 dengan dua ulangan. Tiga taraf faktor ke- padatan kandang masing-masing 8 ekor, 12 ekor dan 16 ekor setiap kandang. Dua taraf faktor-faktor strain yaitu Tatum dan Tegel, jenis lantai kandang yaitu kotak dan "litter", dan jenis kelamin jantan dan betina. ...
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Judul: Penggunaan analisis regresi dalam percobaan faktorial
Abstrak: Analisis regresi digunakan untuk melihat lebih jauh pengaruh penggunaan tingkat protein, tingkat penambahan lysin dalam ransum dan tingkat kepadatan ayam dalam kandang terhadap pertambahan berat badan dan konsumsi ransum ayam. Diharapkan dari hasil penyidikan ini dapat membantu dalam menentukan program-program untuk pemberian ransum serta penentuan kepadatan ayam dalam rangka mening katkan hasil peternakan ayam pedaging. Data diperoleh dari hasil penelitian ayam strain Lor mann MF-202 berjenis kelamin jantan yang ada di Bagian Ternak Unggas, Karang Malang, Jogyakarta. Pengamatan dilakukan selama 7 minggu terhadap konsumsi ransum dan pertambahan berat badan yang dihitung sebagai rata-rata per ekor per kandang. Rancangan percobaan yang digunakan ada lah Rancangan Acak Lengkap berfaktor 35 dengan 3 ulangan Polinomial Ortogonal digunakan untuk menentukan bentuk kurva respon dari hasil data yang diamati dari perlakuan Hasil perhitungan menunjukkan perlakuan berpengaruh nyata, baik terhadap konsumsi ransum maupun pertambahan berat badan. Sedangkan hasil yang lebih terperinci, hanya faktor protein yang menunjukkan pengaruh nyata untuk kedua respon tersebut. ...
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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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