Judul: Studi Tipologi Wilayah Jelajah Kelompok Lutung (Trachypithecus auratus, Geoffrey 1812) DI Taman Nasional Bromo Tengger Semeru
Abstrak: Lutung (Trachypithecus auratus) is one of endemic primate species which its population endangered. Primates life was influenced by habitat. Part of habitat which occupied by an animals or populations in normal daily activities is homerange. Homerange typology data was important in wildlife management, however information about that was very limited. The aim of the research was to determine factors influencing homerange size, and homerange typology of lutung. The research conducted at Bromo Tengger Semeru National Park from Desember 2009 until February 2010. Parameters observed were homerange size, trajectori distance, physical and vegetation factor, information about food dan sleeping trees, and lutung group characteristics The homerange size of langur calculated using convex poligon methode. Vegetation characteristic calculated with vegetation analized kuadrat methode. Result of the research found that langur’s homerange lied at 1158 – 2010 altitude, temperatur 16,5 -20,5ºC. The vegetation density was 75 – 238 individual/hectare, spesies richnes indeks 9,15 – 12,1, feeding trees quantity 4 – 14, and trees relatif density 12-26,67 %. There were 9 groups of lutung, 6 – 33 individu each, one male/multimale group. Based on multiple linier regression, the homerange size was influence by group size (X1) trees density (X9) and tree species numbers (X10). The equation formula was Y = -5,625 + 0,676 X1 + 0,157X10 + 0,10X9 (R = 0,989). Homerange size Neu’s methods of preference index showed that Quercus sundaicus, Ficus sp. and Litsea sp. were sleeping trees prefered of lutung group in the study periode. Based on the equation, homerange size will larger when group size, vegetation density and tree species number increased. Management implication was improve spesies number and Quality of langur feeding and sleeping trees..
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Judul: Homerange of Tricolour langur  (Presbytis chrysomelas ssp. cruciger, Thomas 1892) in Lupak Mawang Resort,  Danau Sentarum National Park
Abstrak: Lutung sentarum merupakan spesies primata endemik di Kalimantan dengan populasi yang sangat sedikit dibandingkan dengan jenis primata lainnya. Lutung sentarum dapat ditemukan di beberapa tempat di Kalimantan, salah satunya di Taman Nasional Danau Sentarum. Data dan informasi spasial mengenai satwa ini masih terbatas, oleh karena itu dilakukan penelitian tentang wilayah jelajah lutung sentarum dan faktor-faktor yang memengaruhi. Penelitian ini bertujuan untuk mengukur wilayah jelajah lutung sentarum dan mengidentifikasi faktor-faktor yang memengaruhi pergerakan lutung sentarum. Penelitian dilakukan pada bulan Juli- Agustus 2022 di Bukit Semujan, Resort Lupak Mawang. Metode yang digunakan adalah observasi langsung dengan metode tracking untuk wilayah jelajah dan pengukuran langsung di lapangan untuk faktor-faktor yang memengaruhi. Hasil penelitian menunjukkan bahwa luas wilayah jelajah lutung sentarum adalah 42,08 ha. Beberapa faktor yang dinilai paling memengaruhi pergerakan lutung yaitu keberadaan pohon makanan, pohon tidur, perjumpaan dengan hewan lain, dan curah hujan., Tricolour langur is an endemic primate species in Borneo with a very small population compared to other primate species. Tricolour langurs can be found in several places in Kalimantan, one of which is Lake Sentarum National Park. Spatial data and information on this species are still limited, therefore a study was conducted on the homerange of tricolour langurs and influencing factors. This study aims to measure the home range of the tricolour langur and identify factors that influence the movement of the tricolour langur. The research was conducted in July- August 2022 at Semujan Hill, Lupak Mawang Resort. The method used was direct observation with tracking method for homerange and direct measurement in the field for influencing factors. The results showed that the homerange of the tricolour langur was 42.08 ha. Some of the factors considered to most influence langur movement are the presence of food trees, sleeping trees, encounters with other animals, and rainfall.
Keyword: Lutung Sentarum, Taman Nasional Danau Sentarum, Wilayah Jelajah, Danau Sentarum National Park, homerange, tricolour langur

Judul: Hydroxyapatite-Chitosan Composite Coating on Stainless Steel 316 to Improve Corrosion Resistance
Abstrak: Metals that were used in bone implantation should have good corrosion resistance that were not easily corroded when implanted into the body. Metal corrosion resistance of stainless steel 316 can be enhanced through the metal coating by hydroxyapatite-chitosan composite with composition ratio of hydroxyapatite (gram) and chitosan 3% (mL) 0.2:0, 0.2:0.1, 0.2:0.5, 0.2:1.0, and 0.2:1.5. Besides improving the corrosion resistance of metal, the presence of chitosan also maintain the position of hydroxyapatite on metal surfaces. Corrosion resistance increases with increasing amount of chitosan added and the best composition of hydroxyapatite-chitosan composite was 0.2:1.0.
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