Judul: Analisis Residu Pestisida Organoklorin Dalam Susu Sapi Dengan Cara Kromatografi Lapis Tipis Dan Kromatografi Gas
Abstrak: Pestisida digunakan untuk meningkatkan hasil pertanian dengan cara mengendalikan serangga atau tanaman lain yang mengganggu tanaman pcrtanian. Salah satu jeRis pcslisida yang digunakan untuk tujuan tersebut adalah jenis pestisida organoklorin yang stabil secara kimia dan tidak mudah diuraikan di alam. Jika masuk ke dalam ekosistim melalui rantai makanan, pe3tisida organoklorin akan terakumulasi dalam jaringan lcmak dan hati. Pada jangka waktu tertentu. akumulasi ini dapat menimhulkan !canker dan kerusakan hati.
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Judul: Pemberantasan Caplak Sapi, Boophilus microplus (Canestrini) Dengan Pestisida Dan Masalah Resistensi Yang Diakibatkan
Abstrak: Penanggulangan utama terhadap serangan caplak pada sapi adalah secara kimiawi dengan menggunakan pestisida. Menurut Barnett (1961), pestisida yang pertama kali digunakan secara 1uas adalah garam arsenat. Selanjutnya digunakan pestisida yang berasal dari tumbuh-tumbuhan yaitu nikotin dan pirethrum. Dengan perkembangan teknologi, pestisida asal tumbuhan ini ditinggalkan pemakaiannya dan diganti dengan bahan organik dari golongan hidrokarbon berkhlor seperti DDT, dieldrin, BHC, toxaphen, khlordan dan aldrin. Namun penggunaan DDT saat ini tidak dibenarkan untuk hewan berproduksi, karena pengaruh residu DDT tetap ada dan bertahan lama di dalam jaringan tubuh hewan. Bahan organik 1ainnya adalah dari golongan organofosfat dan karbamat. Go1ongan organofosfat merupakan senyawa yang kini paling banyak digunakan, karena tidak adanya bahaya residu pada daging atau air susu.
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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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