Judul: Pengaruh waktu penyimpanan dan jenis filter pada jumlah omega -3 dalam minyak limbah hasil pengalengan dan penepungan ikan lemuru (Sardinella longiceps)
Abstrak: Tujuan penelitian ini untuk menentukan kandungan omega-3 pada limbah minyak ikan terutama dari industri pengalengan dan penepungan serta jenis bahan penyaring yang baik agar diperoleh minyak ikan yang bersih, tidak berbau dan mempunyai kandungan omega-3 yang cukup..
Keyword: Fish preservation, Sardinella longiceps, omega -3, ikan lemuru

Judul: Pengaruh suhu dan waktu adsorpsi terhadap kejernihan minyak hasil samping pengolahan tepung Ikan Lemuru (Sardinella lemuru)
Abstrak: Minyak hasil samping pengolahan tepung ikan memiliki potensi untuk digunakan dalam bahan pangan maupun produk farmasi, namun pemanfaatan untuk kedua bidang tersebut masih terbatas akibat terkendala pada kenampakan minyak yang kurang baik, terutama warna dan kejernihannya. Proses pemurnian perlu dilakukan untuk memperbaiki kenampakan minyak, salah satunya dengan menggunakan adsorben. Tujuan penelitian ini adalah menentukan karakteristik minyak hasil samping pengolahan tepung ikan lemuru, menentukan jenis dan konsentrasi adsorben yang tepat untuk meningkatkan kejernihan minyak ikan, serta menentukan pengaruh kombinasi suhu dan waktu adsorpsi terhadap tingkat kejernihan minyak ikan. Parameter kualitas minyak ikan sebelum pemurnian adalah kadar asam lemak bebas 1,18%, bilangan peroksida 5,64 meq/kg, bilangan asam 0,04 mg KOH/g, bilangan p-anisidin 2,07 meq/kg, total oksidasi 13,36 meq/kg, dan nilai kejernihan berkisar 56,40-89,97%. Jenis adsorben yang efektif dalam meningkatkan kejernihan minyak ikan adalah Miracle Filter Powder dengan konsentrasi 1%. Perlakuan terbaik (persen transmitan tertinggi) pada semua panjang gelombang terdapat pada kombinasi perlakuan suhu 100°C dan waktu 100 menit, yaitu 71,30±0,26% (λ 450 nm), 92,10±0,30% (λ 550 nm), 92,87±0,15% (λ 620 nm), dan 93,77±0,15% (λ 700 nm). Rata-rata nilai persen transmitan tertinggi terdapat pada minyak ikan yang dimurnikan pada suhu 100°C, yaitu 67,88±2,40%. Rata-rata nilai persen transmitan tertinggi terdapat pada minyak ikan yang dimurnikan pada waktu 40 menit, yaitu 67,64±1,65%.
Keyword: Clarity, sardine oil, purification

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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