Judul: Analysis of habitat types of tricolour langur (Presbytis  chrysomelas ssp. cruciger, Thomas 1892) in Danau Sentarum National Park, Analysis of habitat types of tricolour langur (Presbytis  chrysomelas ssp. cruciger, Thomas 1892) in Danau Sentarum National Park
Abstrak: Lutung sentarum merupakan primata endemik Kalimantan yang saat ini berada pada status Critically Endangered (kritis) berdasarkan daftar merah IUCN dan belum dilindungi undang-undang. Penelitian ini bertujuan menganalisis tipe habitat lutung sentarum di kawasan Bukit Semujan dan mengkaji kelimpahan tumbuhan sumber pakan yang merupakan salah satu unsur daya dukung habitat. Hasil penelitian menunjukkan bahwa habitat lutung sentarum di kawasan Bukit Semujan terkategorikan ke dalam tiga tipe hutan, yaitu hutan rawa; peralihan; dan bukit. Terdapat 83 spesies dari 40 famili tumbuhan menyusun kawasan Bukit Semujan. Hutan rawa didominasi famili Myrtaceae, hutan peralihan didominasi Cluciaceae, dan hutan bukit didominasi oleh famili Dipterocarpaceae. Secara struktur, vegetasi penyusun habitat lutung memiliki permudaan yang melimpah sehingga menjadi indikasi bahwa habitat lutung mampu beregenerasi. Selain itu, sebanyak 16 jenis tumbuhan penyedia pakan lutung sentarum tersebar di seluruh tipe habitat dan dimungkinkan dijangkau oleh lutung karena kondisi tajuk antar habitat yang saling interkoneksi. Kata kunci: endemik, hutan rawa, IUCN, regenerasi, Tricolour langur is an endemic primate of Borneo which is currently in Critically Endangered based on the IUCN red list and not protected by government’s law. Aim of this research is to analyze the habitat type in the Bukit Semujan and assess the abundance of vegetation that provides food, which is one element of the carrying capacity of the habitat. The results showed that the tricolour langur habitat in the Bukit Semujan area was categorized into three types of forest based on topographic and edaphic differences, namely swamp forest; transition; and hills. There are 83 specieses from 40 plant families that make up the Bukit Semujan area. The swamp forest is dominated by the Myrtaceae, the transitional forest is dominated by the Cluciaceae, and the hill forest is dominated by the Dipterocarpaceae family. Structurally, the vegetation that makes up the lutung habitat has abundant regeneration so that it is an indication that the lutung habitat is able to regenerate. In addition, as many as 16 specieses of plants that provide food for tricolour lutung are spread across all types of habitats and it is possible for langurs to reach them due to the interconnection of canopy conditions between habitats. Keywords: endemic, IUCN, regeneration, swamp forest
Keyword: endemik, hutan rawa, IUCN, regenerasi

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.
Keyword: