Judul: Pengawetan rotan dengan metoda Boucherie
Abstrak: Rotan termasuk salah satu hasil hutan non kayu yang beraneka ragam jenisnya dan mempunyai arti penting bagi pertumbuhan ekonomi Indonesia. Rotan merupakan primadona ekspor dari beberapa hasil hutan non kayu, karena mampu menghasilkan devisa nomor dua setelah kayu. Pengawetan rotan pada umumnya dilakukan setelah, rotan sampai di industri-industri pengolahan. Pengawetan oleh petani pemungut rotan jarang dilakukan, kalaupun ada biasanya berupa pencegahan sementara terhadap serangan organisme-organisme perusak rotan dari dalam hutan sampai rotan laku terjual. Pengawetan yang diberikan tersebut hanya bersifat sementara, oleh karena itu masih perlu dilakukan pengawetan ulang sebelum rotan diolah lebih lanjut. Pada penelitian ini dicoba cara mengawetkan rotan dengan memberikan bahan pengawet sejak dari hutan dengan bantuan aktifitas transpirasi daun. Cara ini dikenal dengan metoda Boucherie. Bahan pengawet masuk ke dalam seluruh bagian batang rotan bersama-sama dengan aliran transportasi air dalam xylem dari bawah sampai ke atas....
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Judul: Pengaruh pengukusan, perendaman urea, perendaman amonia terhadap pelengkungan, sifat fisis mekanis rotan manau (Calamus manan Miq) dan rotan batang (Daemonorops robustus Warb)
Abstrak: Rotan merupakan salah satu jenis komoditi hasil hutan non kayu yang mempunyai peranan penting bagi Indonesia, karena menghasilkan devisa yang cukup besar melalui ekspor rotan. Bahkan sampai saat ini kebutuhan rotan dunia seba- gian besar (80%) berasal dari Indonesia dimana jumlah ekspor ini meliputi 20% dari seluruh produksi rotan. Rotan dapat digunakan sebagai bahan untuk peralatan rumah tangga, seperti mebel, lampit dan barang kerajinan lainnya. Sifat-sifat alamiah yang dipunyai rotan adalah mudah dikerjakan, sangat ringan, tahan lama dan mempunyai warna kuning alamiah menyebabkan rotan banyak disukai konsumen. Oleh karena itu tidaklah mengherankan apabila permintaan akan rotan semakin meningkat setiap tahun, baik di dalam negeri maupun di luar negeri. Di pihak lain ada beberapa jenis rotan yang rentan atau mudah patah di dalam proses pengolahannya, terutama pada saat proses pembengkokan. Persentase kerusakan terbesar pada proses ini yaitu sebesar 19% sampai 32%. Kerusakan tersebut dapat terjadi karena tingginya kekakuan dari jenis-jenis rotan tertentu....
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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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