Judul: Potensi Pati Garut Sebagai Film Edibel Dengan Penambahan Pektin Dan Gliserol
Abstrak: Pati garut merupakan polisakarida alami yang berpotensi untuk bahan dasar pembuatan pengemas bahan pangan yang dapat langsung dimakan dan melindungi produk pangan yang dikemasnya. Penelitian ini bertujuan menghasilkan film edibel dari pati garut dengan variasi persen komposisi gliserol dan pektin sebagai berikut: PGP1 (19:1), PGP2 (18:2), PGP3 (17:3), PGP4 (16:4), dan PGP5 (15:5). Film yang dihasilkan dianalisis bobot jenis, kuat tarik, elongasi, permeabilitas uap air, analisis termal, morfologi, dan uji aplikasi pada pengemasan cabai. Hasil uji pada berbagai komposisi menunjukkan bahwa PGP2 menghasilkan film edibel yang terbaik. PGP2 memiliki permeabilitas uap air yang paling rendah, persen elongasi yang baik, dan aplikasi yang optimum dalam menjaga mutu pangan. Uji aplikasi pada komposisi PGP2 mampu menjaga tekstur dan menambah daya simpan cabai selama 5 hari. Analisis termal menunjukkan penurunan suhu leleh ketika konsentrasi gliserol meningkat. Hasil morfologi menunjukkan film edibel homogen dan tercampur secara merata.
Keyword: film edibel, gliserol, pati garut, pektin

Judul: Film edibel berbasis pati biji durian terplastisasi gliserol
Abstrak: Film edibel merupakan suatu lapisan tipis yang disalutkan pada makanan dan dapat dikonsumsi secara langsung. Fungsinya adalah sebagai penghalang antara makanan dan lingkungan. Pati merupakan bahan yang banyak digunakan untuk membuat film edibel. Limbah biji durian dipilih sebagai sumber pati alternatif untuk dijadikan sebagai bahan baku film edibel. Penelitian ini bertujuan menghasilkan film edibel dengan formulasi pati-gliserol terbaik. Film edibel dibuat dengan 5 formulasi. Semua film yang dihasilkan kemudian dikarakterisasi, yaitu pengujian ketebalan, bobot jenis, kuat tarik dan elongasi, serta permeabilitas uap air. Film edibel terbaik dihasilkan pada formulasi pati-gliserol (70:30) dengan nilai rerata kuat tarik 10.30 MPa dan elongasi 24.43%. Film tersebut kemudian diuji sifat termalnya menggunakan DSC (differential scanning calorymetry) dan morfologinya menggunakan SEM (scanning electron microscope). Berdasarkan termogram DSC, munculnya puncak tunggal titik leleh pada 91.78 °C menunjukkan bahwa bahan yang digunakan adalah pati. Hasil pengamatan morfologi film dengan SEM menunjukkan bahwa film dengan formulasi terbaik memiliki permukaan yang homogen
Keyword: edible film, durian seeds, starch, glycerol

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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