Judul: Sintesis dan Pencirian Hidrogel Poli(asam akrilat)-ko-Polivinil Alkohol dengan Teknik Iradiasi Gamma.
Abstrak: Hidrogel adalah polimer hidrofili dengan jaringan 3 dimensi dan mampu menyerap air. Penelitian ini bertujuan menyintesis hidrogel poli(asam akrilat-ko-polivinil alkohol) dengan iradiasi gamma serta mencirikannya. Dosis radiasi yang digunakan untuk sintesis sebesar 10 kGy. Hidrogel dengan penambahan 1 g PVA menunjukan nisbah pengembung tertinggi yakni 400 g/g pada waktu perendaman 60 menit dan EDS sebesar 264 g/g. Fraksi gel tertinggi ialah sebesar 97% diperoleh dari penambahan 1 g PVA. Pengujian dalam larutan NaCl memenuhi aturan ISO 17190-5-2001 sehingga hidrogel poli(asam akrilat-ko-polivinil alkohol) dapat diaplikasikan sebagai produk personal care, seperti popok bayi.
Keyword: asam akrilat, hidrogel, iradiasi gamma, polivinil alkohol

Judul: Sintesis dan Pencirian Hidrogel Superabsorben Poli(Asam Akrilat)-ko-Polivinil Pirolidon dengan Teknik Iradiasi Gamma
Abstrak: Hidrogel superabsorben (HSA) yang bertaut silang membentuk struktur 3 dimensi, mampu menyerap air ratusan kali bobot keringnya dan tidak larut dalam air. Penelitian ini bertujuan menyintesis dan mencirikan HSA poli(asam akrilat-ko-polivinil pirolidon) dengan iradiasi gamma. Dosis radiasi yang digunakan untuk sintesis sebesar 10 kGy. HSA dengan tambahan 1 g polivinil pirolidon (PVP) menghasilkan nisbah pengembungan tertinggi yakni 659.4g/g. Penambahan PVP akan menurunkan nisbah pengembungan HSA. Fraksi gel tertinggi ialah 68.57% diperoleh dari penambahan 1 g PVP. HSA ini dapat diaplikasikan sebagai bahan dasar popok karena pengujian dalam larutan NaCl dan urea memenuhi aturan yang telah ditetapkan oleh ISO 17190-5-2001.
Keyword: asam akrilat, hidrogel, iradiasi gamma, polivinil pirolidon

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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