Judul: Optimalisasi Usahatani Sayuran Hidroponikk Kasus Carnegie Hydroponics Kecamatan Ciseeng Kabupaten Bogor
Abstrak: Maksimisasi keuntungan merupakan tujuan utama dari semua perusahaan termasuk perusahaan yang bergerak di bidang pertanian. Carnegie Hydroponics adalah salah satu perusahaan budidaya sayuran hidroponik yang aktivitas produksinya masih belum dioptimisasikan. Tujuan penelitian ini adalah untuk membahas tentang kondisi optimum yang dapat diperoleh Carnegie Hydroponics dan bagaimana cara mencapainya. Penelitian ini menggunakan metode Program Linier dan LINDO (Linear, Interactive, and Discrete Optimizier) sebagai alat analisisnya. Penelitian ini diharapkan dapat membuat pemilik perusahaan mengetahui kombinasi output yang perlu diproduksi, berapa biaya yang paling minimum dapat dikeluarkan perusahaan agar mencapai kondisi yang optimal dan tentunya meningkatkan keuntungan perusahaan. Setelah melakukan optimalisasi menggunakan LINDO ditemukan bahwa Carnegie Hydroponics dapat memaksimumkan profit nya hingga Rp 74 469 100 atau meningkat sebesar 81.44 persen dari keuntungan aktual. Keadaan optimal tersebut dapat dicapai dengan mengoptimalisasikan manajemen operasional dan produksi perusahaan.
Keyword: hydroponics, linear programming, optimalization

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: 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.
Keyword: