Judul: Karakteristik fisik dan kimia kompos bokashi, arang sekam, dan arang kayu terhadap penyerapan gas amoniak (NH3)
Abstrak: Biofilter telah banyak digunakan sebagai metode penghilangan gas penyebab bau karena metode ini lebih murah, mudah, dan mampu menghilangkan bau secara sempurna. Aplikasi biofilter dalam industri dilakukan dengan menggunakan bahan pengisi yang kurang diketahui karakteristiknya. Karateristik fisik, kimia dan biologi bahan-bahan tersebut dapat dijadikan landasan untuk meningkatkan kinerja biofilter sehingga, diperlukan informasi yang berkaitan dengan sifat bahan yang sesuai dengan persyaratan bahan sebagai bahan pengisi. Tujuan dari penelitian ini adalah menentukan sifat fisik dan kimia kompos bokashi, arang sekam, dan arang kayu serta menentukan bahan yang terbaik terhadap penyerapan amoniak secara fisik dan kimia.
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Judul: Karakteristik fisik dan kimia campuran tanah, kompos bokashi, dan serasah daun karet terhadap penyerapan gas amoniak (NH3)
Abstrak: Amoniak (NH3) merupakan gas yang sangat berbau, sangat mudah terbang sehingga sangat mengganggu pernafasan dan menyebabkan perih di mata. Ketika amoniak ini teroksidasi menjadi nitrit akan bersifat toksik dan dapat menyebabkan keracunan. Teknologi pengolahan limbah gas dengan menggunakan biofilter telah banyak diaplikasikan oleh berbagai industri sebagai salah satu metode yang dapat diandalkan, sederhana, murah, mudah didapat, dan digunakan. Faktor utama yang menjadi penentu keberhasilan penggunaan biofilter dalam mendegradasi sanyawa polutan target adalah kondisi fisika, kimia dan mikrobiologi bahan pengisi. Bahan pengisi yang baik harus mempunyai beberapa karakteristik tertentu sehingga dapat digunakan sebagai biofilter, diantaranya jumlah pori-pori yang banyak dan mampu menopang kehidupan mikroorganisme. Bahan pengisi berupa tanah, kompos bokashi, dan serasah daun karet merupakan jenis bahan pengisi organik yang sangat murah dan mudah didapat.
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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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