Judul: Kajian Komposisi dan Finansial pada Pemanfaatan Serbuk Sabut Kelapa sebagai Media Tanam Lempengan
Abstrak: Serbuk sabut kelapa merupakan salah satu produk samping hasil pengupasan bush kelapa. Selama ini pemanfaatan produk samping buali kelapa tersebut masih terbatas pada tempurung kelapa dan serat sabut kelapa. Padahal dari pengupasaii tersebut, akan dihasilkan limbah sekitar 19,046 juta m 3. Dari jumlah tersebut, 35 % berupa serat yang dapat. digunakan untuk bahan baku industri rumah tangga sedangkan 65 % dari limbah tersebut bila diolah menjadi media tanam akan meningkatkan nilai tambah yang cukup besar. Media tanam lempengan dari serbuk sabut kelapa merupakan suatu kemasan barn dari media tanam buatan yaitu berbentuk lempeng dengan ukuran sekitar 21 cm x 21 cm x 2 cm dan berat total media adalah 250 g.
Keyword: 

Judul: Kajian teknologi dan finansial pembuatan media tanam dari serbuk sabut kelapa (cocos nucifera)
Abstrak: Pembuatan media tanam dengan memanfaatkan hasil sampingan dari komoditi pertanian merupakan terobosan yang harus terus diusahakan untuk meningkatkan nilai tambah komoditi pertanian. Pemilihan hasil samping produk pertanian didasari oleh analisa kandungan hara yang diperlukan oleh tanaman. Sekam bakar dan serbuk sabut kelapa merupakan kandidat bahan baku yang menonjol berdasarkan laporan data kandungan hara yang ada pada kedua macam bahan baku tersebut. Berdasarkan hasil penelitian terhadap efektifitas media pada pertumbuhan tanaman dengan menggunakan tanaman Krisa sebagai tanaman penguji, meliputi daya serap air, EC (Electrical conductivity), tinggi tanaman, jumlah tunas, jumlah bunga, dan ukuran bunga, kelima komposisi bahan baku (treatment) menghasilkan pertumbuhan tanaman yang berkualitas baik. Dengan Analsa Sidik Ragam terhadap EC, tinggi tanaman, jumlah tunas, jumlah bunga, waktu berbunga, dan ukuran bunga, ternyata semua kombinasi bahan baku menghasilkan nilai yang tidak berbeda nyata. ...
Keyword: 

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.
Keyword: