Judul: Population Distribution and Exploration Area of Javan Langur (Trachypithecus auratus) at Cimande Resort, Gunung Gede Pangrango National Park
Abstrak: Lutung jawa (Trachypithecus auratus) merupakan salah satu primata endemik Pulau Jawa yang dilindungi. Sedikitnya data mengenai lutung jawa menjadikan penelitian ini penting untuk dilakukan. Penelitian ini bertujuan mengidentifikasi sebaran populasi dan mengukur wilayah jelajah lutung jawa di Resor Cimande, Taman Nasional Gunung Gede Pangrango serta mengetahui faktor yang memengaruhi pergerakannya. Pengumpulan data dilakukan dengan metode eksplorasi serta penandaan pada Global Positioning System (GPS) dan Avenza Maps lalu diolah dan dipetakan dengan ArcMap 10.8. Populasi lutung jawa di Resort Cimande ditemui 10 kelompok pada 4 blok hutan yang berbeda dengan estimasi total populasi sebanyak 52 individu, jumlah individu per kelompok terdiri dari 1-9 individu, kepadatan populasi lutung jawa 0,33 ind/ha, nisbah kelamin adalah 1:2, dan persentase struktur umur menurun (piramida terbalik). Wilayah jelajah lutung jawa di Resort Cimande berkisar 2,45 - 21,75 ha. Faktor biotik yang memengaruhi pergerakan lutung adalah ketersediaan pohon pakan, keberadaan manusia dan satwa lain terutama primata. Faktor abiotik yang paling memengaruhi pergerakan lutung adalah curah hujan., Javan langur (Trachypithecus auratus) is one of the endemic primates of Java Island that is protected. The lack of data about Javan langurs makes this research important. This research aims to identify the population distribution and measure the home range of the Javan Langur in Cimande Resort, Gunung Gede Pangrango National Park and to determine the factors that influence its movement. Data collection was carried out using the exploration method and marking on the Global Positioning System (GPS) and Avenza Maps, then processed and mapped with ArcMap 10.8. The Javan langur population in Cimande Resort was found in 10 groups in 4 different forest blocks with an estimated total population of 52 individuals, the number of individuals per group consisted of 1-9 individuals, the population density of Javan langurs was 0.33 ind/ha, the sex ratio was 1:2, and the percentage of age structure was decreasing (inverted pyramid). The home range of the Javan Langur in Cimande Resort ranged from 2.45 - 21.75 ha. Biotic factors that influence langur movement were the availability of food trees, the presence of humans and other animals, especially primates. The abiotic factor that most influences langur movement was rainfall.
Keyword: home range, javan langur, population distribution

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.
Keyword: