Judul: Pengaruh Awal Pemberian Rotifera terhadap Pertumbuhan dan Kelangsungan Hidup Larva Ikan Betutu, Oxyeleotris marmorata (Bleeker), yang Dipelihara dalam Media yang Dipupuk Kompos
Abstrak: Percobaan ini bertujuan untuk mengetahui serta membandingkan pertumbuhan dan kelangsungan hidup larva ikan betutu yang diberi rotifera mulai hari ke-0, 4 dan 8 dalam media pemeliharaan yang dipupuk dengan kompos selama 14 hari masa pemeliharaan (indoor) serta mengevaluasi .keberadaan bahan organik di dalam saluran pencernaan. Percobaan dilaksanakan dari tanggal 26 Oktober 1992 sampai dengan 17 Januari 1993, di Kolam Percobaan Fakultas Perikanan, Darmaga, Bogor.
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Judul: Pengaruh pemberian rotifera dan pakan buatan terhadap pertumbuhan dan kelangsungan hidup larva ikan betutu, oxyeleotris marmorata (blkr.) pada media pemeliharaan yang dipupuk
Abstrak: Percobaan ini bertujuan untuk mengetahui serta membandingkan pertumbuhan dan kelangsungan larva ikan betutu, Oxyeleotris marmorata (Blkr.), pada media yang dipupuk kotoran ayam, dengan diberi rotifera, pakan buatan, atau campuran keduanya. Percobaan berlangsung dari tanggal 22 Maret sampai 30 Agustus 1991, di Kolam Percobaan Babakan, Darmaga, Bogor. Pemeliharaan larva dilakukan di dalam akuarium kaca berukuran 60 x 28 x 35 cm, berisi air media sebanyak 40 liter. Setiap akuarium ditempatkan dalam tangki fiberglass yang telah dipasangi pemanas bertermostat pada suhu 28 - 29 °C. Setiap wadah percobaan ditebari larva ikan betutu berumur 2 hari dengan kepadatan 40 ekor/1. Bobot rata-rata larva pada saat penebaran adalah 0,17 mg dan panjang total 3,55 mm. Percobaan ini menggunakan rancangan. acak lengkap dengan menerapkan tiga perlakuan pemberian pakan, masing- masing diulang tiga kali. Perlakuan Rotifera-Frippak menggunakan pakan alami rotifera 25 ind./ml dan pakan buatan merk frippak 4 g/ton air/hari, perlakuan Rotifera menggunakan rotifera 25 ind./ml, sedangkan perlakuan Frippak menggunakan frippak 4 g/ton air/hari. Rotifera yang digunakan berukuran 50 150 mm, hasil kultur massal, sedangkan pakan buatan yang digunakan adalah frippak tipe 1 CAR berukuran 5 30 mu dan tipe 2 CD, 30 90 m. ...
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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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