Judul: Penanaman jamur merang [Volvariella volvacea (Bull. Ex. Fr.) Sing.] di sekitar Bogor - Jakarta, khususnya mengenai aspek lima hari pertama setelah penyusunan bedengan
Abstrak: Volvariella volvacea (Bull. Ex Fr.) Sing. dibudidayakan di Indonesia pada merang sedang di luar negeri biasanya pada jerami. Penanaman pada merang dilakukan dalam sebuah bangal, terbuat dari bambu, bilik dan kirai atau di luar di pekarangan tanpa atau dengan penutup. Lapisan merang dan lapisan abu-arang tersusun silih-berganti menjadi bedengan.
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Judul: Pengeruh macam dan jumlah bibit jamur merang (Volvariella Volvacca (Bull. ex. Fr,) sing,) terhadap Produksi
Abstrak: Membudidayakan jamur merang merupakan usaha bisnis yang menguntungkan jika hasil produksinya tinggi. Akan tetapi, produksi jamur merang di Indonesia kenyataannya masih rendah, yaitu rata-rata 1.92 kg/m² hingga 1.98 kg/m² pada tahun 1982 sampai 1984. Sedangkan di Filipina, produksinya rata-rata 2.96 kg/m² pada tahun 2 1979. Produksi jamur merang di Indonesia masih dapat ditingkatkan dengan menggunakan bibit berkualitas baik. Di samping itu, menggunakan bibit yang lebih banyak juga diharapkan dapat meningkatkan produksi. Penelitian ini dilakukan untuk mengetahui pengaruh macam dan jumlah bibit jamur merang terhadap produksi. Medium tanam yang dipakai ialah kompos kapas setebal 5 cm dan jerami setebal 10 cm. Kompos kapas digunakan sebanyak 20 kg/m² dan jerami sebanyak 60 kg/m². Satu satuan percobaan merupakan luasan tanah berukuran 0.60 m X 0.80 m x 0.15 m. IPR Penelitian ini menggunakan percobaan faktorial yang disusun menurut rancangan acak kelompok dengan faktor macam bibit dan jumlah bibit sebagai perlakuan. Macam...
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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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