Judul: Sidik Ragam Percobaan Varietas Kedelai pada Tanah Masam dengan Pengapuran
Abstrak: Salah satu metode statistika untuk menganalisis data hasil pereobaan adalah sidik ragam. Penggunaan metode analisis ini dilandasi oleh asumsi-asumsi tertentu. Kesimpulan yang· diperoleh dapal berlalru sah apabila asumsi.asumsinya terpenuhi. Oleh karena itu, pemeriksaan asums; sangat penting dilaknkan sebelum. memasnki tahap analisis_ Pemeriksaan asumsi dengan menggunakan metode eksploratif, ditunjang oleh uji formal yang sesuai, serta penerapan sidik ragam dilakukan terhadap data percobaan varielas kedelai pada lanall masam dengan pengapuran, yang diperoleh dari hasil penelitian Bioleknologi Tanaman Pangan, Bogor. Hasil pemeriksaan menunjukkan bahwa terd'pat penyimpangan asumsi pada respon jumlah biji kedelai, bobot biji kedelai dan tinggi tanaman. Penyimpangan tersebut dapat diatasi dengan transformasi yang sesuai.
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Judul: Metode polinomial orthogonal pengaruh pemupukan Mo dan P terhadap pertumbuhan tanaman kedelai pada tanah latosol
Abstrak: Tujuan dari tulisan ini adalah menelaah penggunaan sidik ragam dan polinomial orthogonal pada rancangan percobaan faktorial serta pengujian asumsi-asumsi yang melandasi sidik ragam pada data hasil penelitian mahasiswa UNUD, Denpasar. Penelitian ini dilakukan sejak tanggal 9 Juni 1988 sampai tanggal 7 September 1988 di rumah plastik kebun percobaan Fakultas Pertanian, UNUD, Denpasar. Jenis tanaman yang diteliti adalah kedelai dengan peubah-peubah yang diamati adalah tinggi tanaman, jumlah cabang, jumlah polong, jumlah biji, berat biji basah, berat biji kering, dan berat 100 biji kering. Langkah awal yang dilakukan terhadap data adalah memeriksa asumsi-asumsi yang melandasi sidik ragam, yaitu asumsi keaditifan model, kenormalan galat acak percobaan, dan kehomogenan ragam galat acak percobaan. Dari hasil pengujian terhadap asumsi-asumsi tersebut, didapat bahwa peubah tinggi tanaman dan jumlah cabang tidak memenuhi asumsi kenormalan dan kehomogenan ragam. ...
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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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