Judul: Pemanfaatan tepung ubi jalar (Ipomoea batatas L.) koln BB00105.10 sebagai bahan dasar produk olahan kukus serta evaluasi mutu gizi dan indeks glikemiknya
Abstrak: Kini, bahan pangan yang mulai banyak diminati oleh konsumen bukan hanya yang memiliki komposisi gizi yang baik, citarasa yang enak, penampakan yang menarik tetapi juga bersifat fungsional yakni bermanfaat bagi kesehatan. Dalam bentuk tepungnya, ubi jalar dapat dijadikan bahan dasar produk olahan sebagai pensubstitusi tepung terigu. Penelitian sebelumnya menunjukkan ubi jalar klon BB00105.10 mempunyai aktivitas hipoglikemik tertinggi dibandingkan 7 varietas/klon ubi jalar lainnya karena didukung oleh pati resisten (3.80 % bk) dan protein (5.47 % bk) yang paling tinggi, daya cerna pati (51.40 %) yang rendah serta mempunyai amilosa (24.94 % bk) sedang. Nilai IG ubi jalar klon BB00105.10 yang dikukus, digoreng dan dipanggang berturut-turut 62, 47 dan 80.
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Judul: Evaluasi mutu gizi dan indeks glikemik produk olahan goreng berbahan dasar tepung ubi jalar (Ipomoea batatas L.) klon BB00105.10
Abstrak: Permintaan dan pemanfaatan ubi jalar di Indonesia masih cukup rendah. Pengolahan ubi jalar di Indonesia masih cukup sederhana dan pengolahannya dalam bentuk ubi segar seperti dipanggang, direbus, dan digoreng segar. Ubi jalar dalam bentuk tepung akan lebih mudah diolah menjadi berbagai bentuk olahan, yang lebih bergengsi, dan dapat diterima oleh berbagai lapisan masyarakat. Tepung ubi jalar juga dapat diolah menjadi produk pangan yang memberikan manfaat terhadap kesehatan. Produk pangan ini dapat digolongkan ke dalam pangan fungsional. Penelitian ini merupakan penelitian lanjutan dari penelitian oleh Astawan dan Widowati (2006) mengenai evaluasi mutu gizi dan indeks glikemik ubi jalar sebagai dasar pengembangan pangan fungsional. Berdasarkan penelitian tersebut, klon unggul ubi jalar BB00105.10 memiliki respon glikemik terbaik dibandingkan klon dan varietas unggul ubi jalar lainnya. Aktivitas hipoglikemik tertinggi tersebut didukung oleh pati resisten (3,8%) dan protein (5,47%) yang paling tinggi serta daya cerna pati yang rendah (51,4%). Ubi jalar klon BB00105.10 mempunyai kadar amilosa sedang (24,94%). Indeks glikemik (IG) ubi jalar segar yang diolah dengan cara digoreng paling rendah (47) dibandingkan IG ubi jalar yang dikukus (62), dan yang dipanggang (80). Berdasarkan data tersebut, maka penelitian ini dilakukan untuk menghasilkan produk olahan goreng yang diharapkan memiliki mutu gizi yang baik dan indeks glikemik yang rendah sehingga dapat dijadikan pangan alternatif untuk tujuan diit.
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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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