Judul: Potential Habitat Modeling for Rhinoceros Hornbill Conservation Priority Zone (Buceros rhinoceros Linnaeus 1758) on Sumatra Island
Abstrak: Rangkong badak (Buceros rhinoceros Linnaeus 1758) merupakan salah satu burung terbesar di Asia. Populasi rangkong badak semakin menurun karena tutupan hutan yang berkurang. Pendugaan habitat potensial spesies ini perlu dilakukan untuk informasi pengelolaan di masa depan. Seratus data koordinat spesies yang diperoleh dari berbagai pustaka dan website GBIF (Global Biodiversity Information Facility) digunakan dalam pemodelan beserta variabel ketinggian, kelerengan, curah hujan, jarak dari jalan, jarak dari pemukiman, jarak dari sungai, NDVI (Normalized Difference Vegetation Index), dan tutupan lahan. Model kesesuaian habitat rangkong badak menghasilkan nilai AUC (Area Under Curve) 0,898. Karakteristik habitat rangkong badak di Sumatera adalah perbukitan atau pegunungan, kerapatan hutan padat, hutan primer atau hutan sekunder serta curah hujan sedang dan dekat dengan sungai. Aceh dan Lampung merupakan provinsi dengan potensi kesesuaian habitat tinggi, karena terdapat kawasan dilindungi yaitu di Taman Nasional Gunung Leuser dan Bukit Barisan Selatan., The rhinoceros hornbill (Buceros rhinoceros Linnaeus 1758) is one of the largest birds in Asia. The rhinoceros hornbill population is decreasing due to reduced forest cover. It is necessary to estimate the potential habitat of this species for future management information. One hundred species coordinate data obtained from the library and GBIF (Global Biodiversity Information Facility) website were used in the modeling along with the variables of elevation, slope, rainfall, distance from roads, distance from settlements, distance from rivers, NDVI (Normalized Difference Vegetation Index), and land cover. The rhinoceros hornbill habitat suitability model yielded an AUC (Area Under Curve) value of 0.898. The characteristics of rhinoceros hornbill habitat in Sumatra are hills or mountains, dense forest density, primary or secondary forest and moderate rainfall, and close to rivers. Aceh and Lampung are provinces with high habitat suitability potential because there are protected areas in Gunung Leuser National Park and South Bukit Barisan.
Keyword: Habitat, Model, Rangkong badak, Sumatera

Judul: Sebaran spasial dan model kesesuaian habitat badak jawa (Rhinoceros sondaicus Desmarest, 1822) di Taman Nasional Ujung Kulon
Abstrak: Javan rhino (Rhinoceros sondaicus Desmarest, 1822) is the most critically endangered species (IUCN 2008). Currently, javan rhino distribution is limited to Ujung Kulon National Park (UKNP), Indonesia. Natural disasters, disease, poaching, encroachment and competition are threats to javan rhino population, hence it is necessary to establish pockets of habitats outside the UKNP which should be based on a study of the spatial distribution and habitat selection by the javan rhino in UKNP as actual habitat. Therefore, the main objective of this study was to develop a habitat suitability models based on the utilization distribution by javan rhino in UKNP. The specific objectives are: 1) to determine the utilization distribution and habitat selection index by javan rhino in UKNP, 2) to identify dominant habitat components that determine the presence of javan rhinoceros in UKNP, and 3) to build a habitat suitability model for javan rhino. The study was carried out in Management Section II area of UKNP, Pandeglang District, Banten Province. The results showed that javan rhinos were mostly occupied areas comprised of swampy shrub (w = 2.197) and shrub (w = 2.012), relatively open habitat (w = 4.233), flat slope (w = 1.313) and sloping areas (w = 1.007), lowland (w = 1.346), close to river (w = 1.087), close to road network (w = 1.395), close to coastal beaches (w = 1.862), close to wallowing areas (w = 3.709) and close to rumpang (open area) (w = 3.783). These indicated that javan rhino selected and had preferences for its habitat. The other results found that there were eight components identified to be the crucial for javan rhino habitat and appropriate for spatial modeling of habitat suitability, i.e. distance from the road, distance from the wallow, distance from the river, distance from the beach, distance from the rumpang (open area), slope, elevation and leaf area index. Dominant factor influencing the frequency of the javan rhino are slope, distance from the rumpang, distance from the wallow and distance from the beach (P<0,005; R2 81,4%). Spatial model of habitat suitability result 11% patches of low suitability, 23,7% patches of moderate suitability and 65,2% patches of high suitability. The validity of the model was 88,6%.
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Judul: Penentuan energi aktivasi ion untuk melewati membran teflon pada berbagai larutan elektrolit
Abstrak: Kaseno (1999) menyatakan bahwa dalam teknologi pemisahan, membran adalah bahan yang dapat memisahkan dua komponen dengan cara yang spesifik yaitu menahan atau melewatkan salah satu komponen lebih cepat dari komponen lainnya. Kemampuan pemisahan yang dimiliki oleh membran untuk melewatkan suatu senyawa kimia atau molekul diakibatkan oleh adanya perbedaan sifat fisika atau kimia antara membran dengan senyawa kimia.
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