Judul: Analisis Kelayakan Usaha Budidaya Sayur Hidroponik di Carnegie Hydroponics Kabupaten Bogor.
Abstrak: Hidroponik merupakan teknologi bercocok tanam tanpa menggunakan tanah, tetapi menggunakan larutan nutrisi di dalam air. Sayuran hidroponik yang dihasilkan lebih bersih, lebih segar dan tanpa pestisida. Salah satu pelaku usaha hidroponik adalah Carnegie Hydropnics yang membudidayakan sayur jenis kale dan selada. Tujuan penelitian ini adalah menganalisis kelayakan usaha sayur hidroponik Carnegie Hydroponics berdasarkan aspek non finansial dan finansial. Selain itu, peneliti juga melakukan analisis switching value untuk mengukur nilai toleransi pada biaya yang dapat dikeluarkan oleh Carnegie Hydroponics. Berdasarkan penelitian yang telah dilakukan, seluruh aspek non finansial layak untuk dijalankan. Hasil penelitian pada aspek finansial diperoleh nilai NPV 48 870 292.01, nilai IRR 7.8 persen dengan suku bunga deposito 6.25 persen, nilai Net B/C 1.073 dan payback period selama 12.27 tahun. Hasil analisis aspepek finansial dapat disimpulkan bahwa usaha layak dijalankan. Komponen analisis switching value memiliki tingkat kepekaan terhadap penurunan harga dan produksi sebesar 3.72 persen, dan kenaikan harga nutrisi dan benih sebesar 140.18 persen.
Keyword: kelayakan, sayur hidroponik, finansial, switching value

Judul: Analisis Kelayakan Usaha Kangkung Hidroponik di Specta Farm Kabupaten Bogor.
Abstrak: Usaha kangkung hidroponik memiliki potensi untuk dijalankan karena semakin tingginya permintaan masyarakat terhadap sayuran yang lebih sehat dan higienis serta memiliki harga jual yang tinggi. Perkembangan teknologi pada budidaya pertanian untuk menghasilkan produk yang lebih sehat dan higienis salah satunya adalah dengan sistem teknologi hidroponik, namun biaya investasi awal yang dibutuhkan sangat tinggi. Tingginya investasi awal, maka perlu dikaji tingkat kelayakannya berdasarkan aspek non finansial, aspek finansial, dan analisis sensitivitas. Aspek yang di uji pada aspek non finansial adalah aspek pasar dan pemasaran, aspek teknis, aspek manajemen dan hukum, aspek sosial ekonomi dan budaya, dan aspek lingkungan. Pada aspek finansial penilaian dilakukan berdasarkan kriteria kelayakan investasi yaitu NPV, Net B/C, IRR, dan PP, serta pada analisis sensitivitas menggunakan metode switching value terhadap perubahan jumlah produksi, harga jual, dan pupuk nutrisi. Hasil analisis kelayakan usaha kangkung hidroponik dinyatakan layak untuk dijalankan berdasrkan aspek non finan sial adan aspek finansial. Hasil analisis sensitivitas disimpulkan bahwa penurunan jumlah produksi lebih sensitif daripada penurunan harga jual dan peningkatakan harga pupuk nutrisi.
Keyword: usaha kangkung hidroponik, kelayakan, kriteria kelayakan investasi, switching value

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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