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: Coexistence of Bornean Langur (Prebytis chrysomelas ssp. cruciger Thomas 1892) and Humans in Danau Sentarum National Park
Abstrak: Taman Nasional Danau Sentarum merupakan salah satu habitat lutung sentarum sebagai primata endemik Kalimantan yang hidup berkoeksistensi dengan masyarakat di sekitar habitatnya. Tujuan penelitian ini yaitu: 1) mengidentifikasi dan menganalisis pengetahuan, persepsi, dan praktik perlindungan masyarakat terhadap lutung sentarum; 2) menghitung dan menganalisis pengaruh karakteristik masyarakat serta aktivitas antropogenik terhadap keberadaan lutung; dan 3) mengidentifikasi dan menganalisis bentuk koeksistensi lutung sentarum dan manusia. Penelitian dilakukan pada Januari 2022 dengan observasi langsung dan wawancara. Hasilnya bahwa masyarakat mengetahui status perlindungan lutung sentarum melalui larangan perburuan oleh TNDS. Pengetahuan terkait perilaku umumnya melihat perilaku makan di pagi hari atau musim buah rawa pada bulan Oktober-Desember. Persepsi masyarakat tergolong cukup−sangat baik (65,5%-95%) terkait ancaman kelestarian, manfaat, dan perlindungan. Hasil uji statistik karakteristik responden dan dampak kegiatan manusia tidak memiliki hubungan baik terhadap praktik perlindungan maupun respon lutung terhadap manusia. Koeksistensi waktu terutama terjadi pada pagi hari bersamaan dengan aktivitas nelayan mencari ikan. Koeksistensi ruang tersebar pada 23 lokasi di Resort Lupak Mawang dan 10 lokasi di Resort Sepandan dan sekitarnya., Danau Sentarum National Park is one of bornean langur’s habitats in which the Borneo endemic primate lives and coexists with humans. This research was aimed to 1) identify and analyze local people’s knowledge, perception, and conservation practices of langur; 2) calculate and analyze how people’s characteristics and their activities affecting langur; then 3) identify and analyze coexistence of langur and humans. In January 2022 it was conducted by observation and interview. Results are that the knowledge regarding langur consists of its conservation encouraged by hunting probihition from national park management. Langurs were mostly spotted when they are eating in the morning or during swamp fruits season in October−December. People’s perception is in range of good enough-very good (65,5%-95%) on various topics such as threats, utilities, and conservation. People’s characteristics and anthropogenic activities are not associated statistically with neither conservation act nor langur’s responses toward humans. Coexistence chiefly happens in the morning when fishermen start looking for fish and are distributed at 10 spots in Sepandan and its vicinity along with 23 spots in Lupak Mawang.
Keyword: Danau Sentarum, bornean langur, human-primate coexistence, national park, koeksistensi, lutung sentarum

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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