Judul: Substitusi tepung kedele glycine max dengan tepung biji kapuk ceiba petandra dalam pakan juvenil udang vaname Litopenaeus vannamei : kajian histologi, enzimatik dan komposisi asam lemak tubuh
Abstrak: Usaha yang sudah dilakukan selama ini untuk mencari kandidat dari bahan nabati pengganti tepung ikan adalah tepung bungkil kedele. Hal ini disebabkan tepung bungkil kedele memiliki nilai nutrisi yang baik hampir menyerupai tepung ikan. Hingga saat ini tepung bungkil kedele masih diimpor dari beberapa Negara dan harganya cenderung meningkat selama satu decade terakhir. Oleh karena itu perlu dicari bahan sumber protein nabati alternative yang memiliki kualitas seperti halnya tepung bungkil kedele, harganya lebih kompetitif, berbasis hasil samping industry lokal dan tersedia secara berkesinambungan. Bungkil biji kapuk merupakan salah satu sumber protein nabati dari hasil pengolahan minyak biji kapuk yang dapat digunakan sebagai sumber protein pakan udang. Keterbatasan dari biji kapuk adalah mengandung zat antinutrien gosipol dan asam lemak siklopropenat. Gosipol bebas dan asam lemak siklopropenat dapat mengganggu fungsi hepatopankreas, fungsi enzim pencernaan dan komposisi lemak tubuh. Oleh karena itu dilakukan penelitian tentang Substitusi Tepung Bungkil Kedele Glycine max dengan Tepung Bungkil Biji Kapuk Ceiba petandra dalam Pakan Juvenil Udang Vaname Litopenaeus vannamei : Kajian Histologi, Enzimatik dan Komposisi Asam Lemak Tubuh
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Judul: Pemanfaatan Tepung Bungkil Kedelai Dalam Pakan Benih Ikan Patin (Pangasius hypophthalmus)
Abstrak: Tepung ikan merupakan bahan baku dalam pembuatan pakan ikan dan merupakan sumber protein utama, karena mengandung keseimbangan asam amino essensial (AAE) yang sangat baik bagi pertumbuhan dan perkembangan ikan. Namun demikian penggunaan tepung ikan sebagai sumber protein untuk budidaya pada masa mendatang mulai terbatas . Karena itu penting untuk menemukan sumber protein alternatif untuk mengurangi penggunaan tepung ikan dalam pakan ikan. Sumber protein alternatif yang secara intensif dipelajari dan diteliti adalah sumber protein nabati dari tepung kedelai. Penelitian ini bertujuan untuk menentukan besarnya penggantian tepung ikan oleh tepung bungkil kedelai sebagai sumber protein alternatif terhadap kecernaan dan kinerja pertumbuhan ikan patin.
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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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