Judul: Pengaruh Pemberian Asam humat Terhadap Konsentrasi Unsur Ai dan Fe
Abstrak: Penelitian ini bertujuan u11tuk mengetahui pengaruh asam humat dm waktu inkubasi terhadap konsentrasi m;ur A1 dan Fe dalarn suatu sistern larutan melalui penelitian di laboratorium. Perlakuan disusun dengan Rancangan Acak Lengkap (RAL) faktorial dua ulangan, dergan faktor taraf asam humat dan waktu inkubasi. Satuan percobam berupa kombinasi antara konsentrasi A1 dan Fe. Uji lanjut Bsda Nyata Terkecil (BNT) dan analisi:; ragam dilakukan untuk mengetahui pengaruh dari tiap perlakuan terhadap masing-masing satuan percobaan. Asam humat yang digunakan diperoleh dari ekstcik Gambut Perawang dan Andosol Lembang.
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Judul: Pengaruh penambahan Fe dari semen ( INDOCEMENT ) terhadap kadar Fe darah, otot, tinja dan Hb kerbau
Abstrak: Penelitian dilakukan di Kompleks Ruminansia Balai Penelitian Ternak Ciawi, Bogor. Penelitian dimulai da- ri bulan September 1984 sampai dengan bulan Januari 1985. Tujuan penelitian ini adalah untuk mempelajari pe- ngaruh penambahan Fe dari semen (indocement) terhadap distribusi Fe ke dalam darah dan otot serta tingkat ke- racunan besi terhadap ternak. Ternak yang digunakan pada penelitian adalah 16 ekor kerbau rawa (Bubalus bubalis) betina dengan bobot badan awal berkisar antara 196 - 272 kg. Enam belas ekor ternak tersebut dibagi menurut bobot badan menjadi empat kelompok perlakkuan. Ransum yang diberikan pada kelompok A: 30 g garam dapur + 60 g CaCO3, B: 60 g CaCO3 + 60 g campuran mineral, C: 30 g garam dapur + 100 g semen, D: 30 g garam dapur + 200 g semen. Semua ransum perlakuan ditambah dua kg dedak padi. Jerami padi diberikan secara ad libitum. Rancangan yang dipakai berupa Rancangan Acak Kelompok. Pengaruh perlakuan dibedakan dengan uji jarak "Duncan". Pertambahan bobot badan dihitung dengan per- samaan regresi, dan dianalisa dengan Analisa Covariance (Ancova). Hasil penelitian menunjukkan bahwa tidak ada pengaruh perlakuan terhadap pertambahan bobot badan, kon- sumsi bahan kering ransum dan konsumsi air minum (P<0.05). Kadar Fe dalam plasma, HB dan otot tidak berbeda nyata dari masing-masing perlakuan. Ekskresi Fe melalui tinja pada perlakuan D berbeda nyata dengan perlakuan A. Persentase Fe yang dikeluarkan melalui tinja pada keempat perlakuan tidak berbeda nyata…
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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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