Judul: Vulkanisasi radiasi karet dengan menggunakan monomer polifungsional
Abstrak: Areal kebun karet di Indonesia pada tahun 1993 mencapai 3.405 juta hektar dengan produksi 1.475 juta ton dan total ekspor 1.214 juta ton yang bernilai US$ 977.088 juta. Sampai saat ini ekspor karet alam Indonesia sebagian besar berupa bahan mentah yang harganya sangat dipengaruhi gejolak harga. Masalah ini mendorong pemerintah untuk membangun industri hilir pengolahan karet alam dengan harapan ekspor karet alam Indonesia bergeser ke arah produk jadi yang mempunyai nilai devisa lebih tinggi, harga lebih stabil serta membuka lapangan kerja baru bagi masyarakat Indonesia. Karet alam memiliki beberapa sifat fisik yang kurang baik misalnya tegangan putus yang rendah. Untuk memperbaiki sifat-sifat itu dapat dilakukan vulkanisasi yang bertujuan untuk meningkatkan tegangan putus, tegangan tank dan kekerasan serta menurunkan perpanjangan putus dan perpanjangan tetap. Penelitian ini bertujuan untuk memperbaiki sifat-sifat fisik karet alam dengan teknik vulkanisasi radiasi serta mencari jenis monomer polihngsional yang memberikan hasil optimal pada sifat-sifat karet tersebut.
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Judul: Rancang Bangun Proses Produksi Karet Remah Berbasis Produksi Bersih
Abstrak: Karet alam merupakan salah satu komoditas agroindustri unggulan Indonesia dengan luas areal tanam karet 3,3 juta hektar dan jumlah produksi 2,637 juta ton pada tahun 2006. Sekitar 85 persen dari total produksi karet Indonesia tersebut diekspor ke beberapa negara dan menghasilkan devisa sebesar 4,32 milyar dollar AS. Tanaman karet di Indonesia sebagian besar milik petani yaitu sekitar 80 persen dari total areal tanam karet dengan produktivitas rata-rata sekitar 700 kg karet kering/ha./tahun sedangkan selebihnya merupakan perkebunan negara dan swasta dengan produktivitas yang lebih tinggi. Selain itu, perkebunan negara telah melakukan penanganan tanaman karet dengan baik dan mengolah lateks kebun yang dihasilkan menjadi beberapa jenis produk karet yaitu ribbed smoked sheet (RSS), lateks pekat, dan karet remah (SIR) jenis mutu SIR 3 L, 3 WF, dan 20.
Keyword: rubber coagulum, rubber industry, crumb rubber, latex field coagulating stage

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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