Judul: Mapping the Habitat Suitability of the Javan Langur (Trachypithecus auratus Geoffroy, 1812) in the Mount Gede Pangrango National Park
Abstrak: Lutung jawa (Trachypithecus auratus) merupakan satwa endemik Indonesia yang dapat ditemukan di Taman Nasional Gunung Gede Pangrango (TNGGP) dan saat ini memiliki status konservasi rentan. Salah satu upaya konservasi untuk menjaga populasi satwa ini yaitu dengan studi kesesuaian habitat. Penelitian ini bertujuan untuk mengetahui komponen yang mempengaruhi sebaran lutung jawa dan kesesuaian habitatnya di TNGGP. Analisis yang digunakan pada variabel lingkungan yaitu analisis multikolinearitas dan pembangunan model kesesuaian habitat diolah dengan Maximum Entropy. Hasil menunjukkan bahwa komponen habitat dengan peluang kehadiran lutung jawa paling tinggi berada pada habitat yang dekat dengan primata lain dan lokasi wisata, berada pada hutan dengan kerapatan hutan tinggi, ketinggian kanopi 26 m, ketinggian tempat 700 mdpl, kelerengan agak curam (17%), memiliki jarak 110 m dari sungai, 4500 m dari perkebunan, 150 m dari semak belukar, serta 500 m dari pemukiman atau lahan terbangun. Hasil pemodelan di TNGGP menunjukkan terdapat kawasan seluas 589,54 ha sangat sesuai, 1.080,35 ha sesuai, 2.533,31 ha cukup sesuai dan 20.075,64 ha kurang sesuai., Javan langur (Trachypithecus auratus) is an endemic species in Indonesia that can be found in the Mount Gede Pangrango National Park (TNGGP) and currently classified as vulnerable. The way to maintain this species population is identify the suitability of its habitat. This research aims to identify the factors that affect distribution of javan langur and their habitat suitability in TNGGP. Environmetal variable was analyzed using multicollinearity analysis and habitat suitability model build using Maximum Entropy. The results show that the habitat components with the highest probability of javan langur presence are habitats that close to other primates and tourist sites, and near from forests with high forest density, an forest canopy height of 26 m, an elevation of 700 masl, moderate steep slope (17%), a distance of 110 m from rivers, 4.500 m from plantations, 150 m from shrubland, and 500 m from settlements and built-up land. The modeling results indicate there are areas of 589,54 ha that are highly suitable, 1.080,35 ha that are suitable, 2.533,31 ha that are moderately suitable, and 20.075,64 ha that are less suitable in TNGGP.
Keyword: habitat, habitat suitability, javan langur, modeling

Judul: Studi Habitat Lutung Jawa (Trachypithecus auratus E. Geoffroy 1812) di Resort PTN Cimande, Taman Nasional Gunung Gede Pangrango
Abstrak: Lutung jawa (Trachyppithecus auratus) adalah primata endemik Indonesia yang termasuk kategori rentan dalam IUCN. Keberadaan lutung akan tetap berlanjut dengan tersedianya habitat yang baik, sehingga informasi mengenai kondisi habitat lutung jawa diperlukan untuk pengelolaan habitat yang lebih baik. Penelitian mengenai habitat lutung jawa bertujuan mengidentifikasi komponen-komponen habitat, mengidentifikasi jenis tumbuhan pakan dan bagian yang dimakan, serta mengukur ketersediaan tumbuhan pakan. Penelitian dilakukan pada bulan Maret 2024 di RPTN Cimande, Taman Nasional Gunung Gede Pangrango. Data penelitian didapatkan dengan melakukan observasi lapang dan pengukuran di lapangan. Hasil penelitian menunjukkan bahwa lutung dapat dijumpai pada ketinggian 684-884 mdpl dengan kelerengan 0%-45%. Jenis tumbuhan yang sering dikonsumsi lutung ialah teureup, ki bolong, dan kayu afrika, dengan perbandingan bagian tumbuhan yang dimakan yakni 58,82% daun dan 41,18% buah. Keberadaan tumbuhan pakan mendominasi pada habitat lutung jawa, sehingga ketersediaannya dapat dikatakan melimpah. Selama penelitian dijumpai primata selain lutung jawa yakni monyet ekor panjang, surili, dan owa jawa, namun tidak teramati terjadinya konflik antar primata., Javan langur (Trachypithecus auratus) is an endemic primate in Indonesia that is categorized as vulnerable by IUCN. The existence of langurs will continue with the availability of suitable habitat, so information regarding the habitat conditions of javan langurs is needed for better habitat management. Research on javan langur habitat aims to identify habitat components, types of food plants and the parts they eat, and measure the availability of food plants. The research was conducted in March 2024 at RPTN Cimande, Gunung Gede Pangrango National Park. Research data were obtained by conducting field observations and measurements in the field. The research results show that langurs can be found at an altitude of 684-884 meters above sea level with a slope of 0%-45%. The plants often consumed by langurs are teureup, ki bolong, and kayu afrika, with the ratio of plant parts eaten being 58,82% leaves and 41,18% fruit. Food plants dominate the javan langur habitat, so their availability is abundant. During the research, primates other than javan langurs were found, namely long-tailed monkey, surili, and javan gibbon, but no conflict between primates were observed.
Keyword: food plants, habitat, javan 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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