Judul: IPB (Bogor Agricultural University)
Abstrak: Dalam pengembangbiakan domba garut masalah utama yang menjadi kendala adalah terbatasnya pejantan unggul dan potensi reproduksi domba garut betina yang belum dimanfaatkan secara optimal. Penelitian bertujuan untuk melakukan optimalisasi pengolahan semen dan mengkaji pemanfaatan teknologi laserpunktur untuk sinkrorisasi estrus induk betina dan peningkatan libido pejantan domba garut (Ovis aries)
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Judul: IPB (Bogor Agricultural University)
Abstrak: Spermatozoa domba sangat sensitif terhadap perubahan suhu yang ekstrim selama proses kriopreservasi semen. Kualitas semen beku domba garut dapat dipertahankan dengan menambahkan berbagai senyawa krioprotektan seperti laktosa dan gliserol serta senyawa antioksidan seperti glutation dan p-karoten. Demikian pula halnya dengan upaya kriopreservasi spermatozoa asal cauda epididimis yang merupakan salah satu alternatif sumber garnet hewan jantan untuk keperluan penerapan teknobgi reproduksi, karena spennatozoa tersebut telah memiliki motilitas dan daya membuahi oosit. Penelitian ini dilaksanakan di Laboratorium Teknologi Budidaya Peternakan, Badan Pengkajian dan Penerapan Teknologi (BPPT), Jakarta; Peternakan Domba Laga "Lesan Putra", Bogar, dan Laboratorium Pascapanen Departemen Pertanian, Bogor, dari bulan Juli 2001 hingga bulan April 2004. Tujuan penelitian adalah: (1) menguji konsentrasi optimum laktosa dan gliserol dalam pengencer semen beku domba garut, (2) menguji pengaruh penambahan glutation dan ~-karoten dalam berbagai konsentrasi terhadap kualitas semen beku domba garut, (3) menguji pengaruh lama penyimpanan epididimis terhadap kualitas spermatozoa cauda epididimis yang telah dibekukan pada domba garut, (4) menguji respons domba garut betina terhadap implan CIDR-GCI dalam merangsang terjadinya estrus, dan (5) menguji kemampuan fertilitas semen baku hasil ejakulasi dan spermatozoa cauda epididimis yang telah dibekukan pada domba garut. Metode penelitian disesuaikan dengan tujuan penelitian dan dilaksanakan secara bertahap.
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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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