Judul: Vermicomposting oleh Cacing Tanah (Eisenia fetida dan Lumbricus rubellus) pada Empat Jenis Bedding
Abstrak: Berbagai bentuk dan jenis sampah dihasilkan oleh masyarakat. Sampah yang terkumpul disekitar rumah, pasar maupun di TPA semakin sulit untuk ditanggulangi. Salah satu cara yang baik untuk mereduksi sampah domestik adalah dengan melakukan vermicomposting. Vermicomposting merupakan proses konsumsi bahan organik dengan melibatkan kerjasama cacing tanah dan mikroorganisme. Hasil akhir dari proses ini adalah vermikompos yang sangat berguna bagi tanaman. Cacing tanah E. fetida dan L. rubellus merupakan dua dari spesies cacing tanah yang sangat berpotensi dalam proses vermicomposting.
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Judul: Efektivitas Penggunaan Jenis Wadah Sarang Cacing Tanah (Eisenia foetida) dalam Proses Vermicomposting
Abstrak: bantuan cacing tanah. Dalam penelitian ini dipelajari efektivitas 3 jenis wadah sarang cacing tanah (Eisenia foetida) dalam mengolah sampah organik dapur, diantaranya: bakul, ember dan pot tanah liat (masing-masing dengan 3 ulangan). Bahan yang digunakan sebagai media (bedding) terdiri atas: sobekan kertas, tanah dan sayuran yang telah dicacah. Pemeliharaan dan pengamatan dilakukan selama 30 hari. Hasil percobaan menunjukkan bahwa jenis wadah tidak mempengaruhi persentase bobot sampah yang didekomposisi oleh cacing tanah. Jenis wadah juga tidak mempengaruhi mortalitas dan bobot cacing tanah, bobot kascing, bobot tanah serta kertas yang terdekomposisi. Hal ini mungkin karena kondisi lingkungan, terutama suhu media yang masih dalam kisaran suhu optimum bagi cacing tanah (antara 21.1-29.4oC). Hasil yang berbeda nyata hanya terlihat pada produksi jumlah kokon yang dihasilkan (P=0.0052). Bakul merupakan jenis wadah yang memiliki jumlah kokon terbanyak bila dibandingkan dengan ember dan pot tanah liat. Kadar C/N rasio kascing yang dihasilkan tiap jenis wadah berkisar antara 22.4-24.12 dan pH kascing 7.4-7.5.
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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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