Judul: Mempelajari pengaruh bahan pemucat terhadap karakteristik sludge oil hasil cold stripping
Abstrak: Rolling Oil merupakan pelumas yang digunakan pada proses penipisan pelat baja (Cold Stripping). Penggunaan Rolling Oil secara berulang menyebabkan minyak mengalami kerusakan yang akan menurunkan kinerja pelumasan. Rolling Oil setelah digunakan didaur ulang kembali pada unit Roll Coolant Plant dengan proses separasi. Sludge yang dihasilkan dari proses separasi masih mengandung minyak. Penelitian ini bertujuan memisahkan fasa minyak dari fasa padatan (sludge) dan air, dan memucatkan sludge oil tersebut dengan bahan pemucat dalam rangka mendapatkan karakteristik sludge oil yang mendekati karakteristik rolling oil segar. (Pure Oil). Rancangan Percobaan yang digunakan adalah Rancangan Acak Kelompok Faktorial dengan dua kali ulangan. Jenis minyak dikelompokkan menjadi dua (B), yaitu pengambilan sludge pada tanggal 22 Juni 1995 (tahap awal periode) sebagai kelompok I (B1), dan pengambilan tanggal 27 Juni 1995 (tahap akhir periode) sebagai kelompok II (B2). Penelitian ini terdiri dari dua perlakuan, yaitu konsentrasi Asam Oksalat dengan taraf 0%, 0.25%, 0.50%, dan 0.75%, dan konsentrasi Bentonit dengan taraf 0%, 0.5%, 1.5% dan 2.5% Analisis terhadap Sludge Oil meliputi Bilangan Asam, Bilangan Penyabunan, Bilangan Iod, Bilangan Peroksida, Fraksi Tak Tersabunkan, Bobot Jenis, Viskositas, Kejernihan, Kadar Abu, Rendemen, Analisis Unsur Mineral dan Analisis dengan Kromatografi Gas....
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Judul: Pengaruh Penambahan Bahan pemucat terhadap Karakteristik Magnetic Filter Sludge Oil Hasil Cold Stripping
Abstrak: Rolling Oil mempakan pelumas yang digunakan pada proses penipisan pelat baja (Cold Stripping). Penggunaan Rolling Oil secara berulang menyebabkan minyak mengalanii kerusakan yang akan menumnkan kinerja pelumasan. Roiling Oil setelah digunakan didaur ulang kembali pada unit Roll Coolant Plant dengan proses separasi. Pada proses tersebut, dipisahkan antara fasa minyak, air, dan sludge.
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Judul: Habitat characteristics of timor friarbird philemon inornatus in Camplong Landscape Kupang District, East Nusa Tenggara
Abstrak: Timor Friarbird (Philemon inornatus, G. R. Gray, 1846) is one of the six endemic birds of Timor and is a protected species. The population of bird is suspected to have been decreasing over the past six years along with the decreasing of the quantity and quality of physical and biotic factors of its habitat. Knowledge on landscape spatial pattern could be used to evaluate the quantity and quality of habitat. This research aimed at identifying spatial habitat characteristics of Timor Friarbird based on dominant factors of physical and biotic habitat components. Principle Component Analysis (PCA) on the physical habitat factors showed that variables that have strong correlation with the presence of the bird were Normalized Difference Vegetation Index (NDVI), slope, distance from secondary forest, distance from bush, distance from cashew plantation, distance from crop plantation, and distance from roads. The biotic factors that have strong correlation with the presence of Timor Friarbird were the total number of plant species, number of plants used for food and cover, and mean height of trees. Height of poles was the only variable that has no correlation with the presence of Timor Friarbird. The most dominant physical and biotic factors that influent the presence of Timor Friarbird at a site are the density of foraging trees, slope, distance from the river, the distance from secondary forest, the density of cover pole and the distance from road. The estimation population of Timor Friarbird in Camplong region is low; this might be caused by low feeding tree density, high rates of poaching, the uneven distribution of feed vegetation and the flowering season, habitat degradation due to illegal logging, grazing cattle in the wild, and invasion of siam weed or chromolaena (Chromolaena odorata). The results of land cover classification at Camplong region based on Landsat_5 Thematic Mapper (TM) image with ArcGIS 9.3 and Erdas 9.1 obtained 11 land cover classes, with shrub as the dominant class. Keyword: Philemon inornatus, Habitat Spatial Characteristics, PCA, Population, Land Cover
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