Judul: Analisis kelayakan pengusahaan benih jagng hibrida F1 pada PT. Java Inti Agriniaga
Abstrak: Tanaman jagung sangat bermanfaat bagi kehidupan manusia ataupun hewan. Di Indonesia, jagung merupakan makanan pokok kedua setelah padi. Seiring dengan adanya peningkatan konsumsi hewani maka industri pakan banyak bermunculan. Tentu saja dengan pertumbuhan industri pakan yang semakin meningkat menuntut penyediaan jagung dalam negeri, khususnya untuk pakan ternak, tiap tahun terpaksa dilakuakn impor sebesar 1,5 juta ton, sedangkan untuk pangan di impor sekitar 0,5 juta ton. Padahal, potensi lahan untuk penanaman jagung masih tersedia. Dengan pembukaan lahan baru dan peningkatan produktivitas lahan yang ada, diharapkan impor jagung dapat tergantikan oleh produksi dalam negeri.
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Judul: Studi pengelolaan tanaman pada produksi benih jagung hibrida di PT Dupont Indonesia, Malang
Abstrak: Jagung merupakan komoditas pangan yang memiliki potensi besar untuk kepentingan industri pangan, pakan dan biofuel. Produktivitas jagung nasional untuk varietas lokal masih sangat rendah, yaitu 2 - 3 ton/ha, jagung hibrida 7 - 10 ton/ha, dan jagung komposit kurang dari 5 ton/ha. Keunggulan menggunakan benih jagung hibrida adalah tahan terhadap penyakit tertentu, masa panennya lebih cepat dengan kualitas dan kuantitas produksi lebih tinggi. Selain untuk pangan, jagung juga dimanfaatkan sebagai pakan ternak unggas dan ruminansia. Magang bertujuan untuk meningkatkan pengetahuan, keterampilan, dan pengalaman lapangan mahasiswa. Tujuan khusus magang adalah mempelajari pengelolaan tanaman pada produksi benih jagung hibrida. Kegiatan magang dilakukan di PT Dupont Indonesia, Malang, Jawa Timur selama lima bulan mulai dari bulan Februari hingga Juli 2010.
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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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