Judul: Optimasi produksi karet olahan di pabrik pengolahan karet mira mare PT Perkebunan XIII (persero), Garut
Abstrak: Karet merupakan komoditas perkebunan yang cukup penting bagi perekonomian Indonesia, baik sebagai sumber penghasil devisa maupun sumber pendapatan dan penghidupan rakyat banyak. Penelitian ini bertujuan untuk mengidentifikasi bahan baku produksi karet olahan dan pola penanganannya, menentukan kombinasi produk yang optimal, melakukan analisis sensitifitas sebagai dasar strategi untuk mengatasi perubahan di masa datang serta membuat perkiraan kebutuhan karet di masa datang. Perkebunan Mira Mare, Garut memproduksi dua jenis karet olahan yaitu Ribbed Smoked Sheet (RSS) dan Brown Crepe (BC). Alat-alat pengolahan yang digunakan untuk masing-masing jenis berbeda, kecuali alat bandela press...
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Judul: Analisis subsistem produksi dan struktur biaya produksi komoditi karet alam  : (Studi kasus di Perkebunan Karet Musilandas, PTP X, Kabupaten Musi Banyuasin, Propinsi Sumatera Selatan)
Abstrak: Komoditi karet sebagai salah satu komoditi perkebunan yang diperdagangkan secara internasional merupakan komodi- ti ekspor yang sangat penting bagi perekonomian Indonesia, karena merupakan penghasil devisa terbesar dalam sub sektor perkebunan. Dari keseluruhan bahan ekspor, karet adalah yang ketiga terbesar setelah minyak bumi dan kayu. Masalah yang sering dihadapi dalam bidang perkaretan Indonesia adalah harga jual yang berfluktuasi, biaya produksi yang terus meningkat dan produktivitas karet Indonesia yang relatif masih rendah akibat rendahnya produktivitas karet rakyat. Dalam penelitian yang dilakukan di Perkebunan Karet Musilandas - PTP X ini, terlihat produksi dan produktivi- tas karet kebun Musilandas selama delapan tahun terakhir cenderung naik. Hal ini sejalan dengan bertambah luasnya areal, adanya perbaikan dalam sistem produksi, adanya sistem ethrelisasi, pemupukan yang teratur serta penggu- naan klon unggul. Hanya pada tahun 1987 dan 1990 terlihat sedikit menurun karena adanya serangan penyakit jamur akar putih dan keadaan cuaca yang kurang mendukung. Jenis mutu yang diutamakan dalam produksi adalah karet sheet I (RSSI) yang merupakan kualitas terbaik, ...
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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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