Judul: Social Behavior of Langur Borneo (Presbytis chrysomelas ssp. cruciger) in Lupak Mawang Resort, Danau Sentarum National Park
Abstrak: Status kritis dan terbatasnya penelitian pada populasi langur borneo mendorong dilakukannya pengumpulan data bioekologi, salah satunya mengenai perilaku sosial. Penelitian ini bertujuan untuk mengidentifikasi perilaku sosial; menganalisis hirarki dan peranan sosial pada kelompok; serta mengidentifikasi interaksi sosial langur borneo dengan jenis primata lain. Penelitian dilaksanakan pada bulan Juli hingga Agustus 2021 di Resort Lupak Mawang, Taman Nasional Danau Sentarum. Pengumpulan data primer perilaku sosial langur borneo dilakukan dengan metode scan sampling dan pencatatan continuous recording. Langur borneo melakukan 66 kali perilaku sosial dengan durasi total 72 menit. Pada perilaku agonistik, vokalisasi, bermain, menelisik, dan seksual, masing-masing persentase frekuensi 48,48%; 39,39%; 10,61%; 1,52%; dan 0%. Lama penggunaan waktu secara berturut-turut sebesar 44,44%; 41,67%; 12,50%; 1,39%; dan 0%. Dominasi teridentifikasi melalui perilaku agonistik, vokalisasi, dan peranan dalam mengatur pergerakan kelompok. Interaksi sosial langur borneo dengan jenis primata lain didominasi oleh perilaku agonistik dan besar disebabkan oleh tumpang tindih habitat., The critical status and limited research on the langur borneo population has prompted the collection of bioecological data on of which is social behavior. This study aims to identify social behavior; analyze the group’s hierarchy and social roles; and identify the social interactions between langur borneo and other primate species. This data research was carried out from July to August 2021 in Lupak Mawang Resort, Danau Sentarum National Park. Primary data of langur borneo’s social behavior was collected by using scan sampling method and continuous recording. Langur borneo performed 66 times social behaviors with a total duration of 72 minutes. Each frequency percentage of agonistic, vocalization, playing, grooming, and sexual behaviors are 48.48%; 39.39%; 10.61%; 1.52%; and 0%. Time length succesively are 44,44%; 41.67%; 12.50%; 1.39%; and 0%. The dominance was identified through agonistic behavior, vocalizations, and role in regulating group movement. The social interaction between langur borneo and other primate species is dominated by agonistic behavior and most influenced by overlapping habitat.
Keyword: langur borneo, social behavior, social hierarchy, social interactions

Judul: Social Behavior of Tricolour langur (Presbytis chrysomelas ssp. cruciger) at Majang Island Resort, Danau Sentarum National Park, Social Behavior of Langur Borneo (Presbytis chrysomelas ssp. cruciger) at Majang Island Resort, Danau Sentarum National Park
Abstrak: Langur borneo (Presbytis chrysomelas cruciger) merupakan jenis langur endemik kalimantan yang kini memiliki status keterancaman kritis, namun belum masuk ke dalam satwa dilindungi secara hukum di Indonesia. Hal ini disebabkan oleh minimnya acuan data mengenai bio-ekologi langur borneo, salah satunya perilaku sosial. Tujuan penelitian ini adalah mengidentifikasi perilaku sosial, menganalisis organisasi, dan interaksi langur borneo dengan jenis primata lain. Penelitian dilaksanakan pada Juli-Agustus 2021 di Resort Pulau Majang, Taman Nasional Danau Sentarum. Metode pengambilan data perilaku sosial dengan scan sampling dan pencatatan continuous recording. Hasil perilaku sosial yang didapatkan ialah vokalisasi (34,48%), menelisik (20,69%), agonistik (13,79&), seksual (3,45%), dan bermain (27,59%). Langur borneo hidup secara berkelompok dengan hirarki sosial yang dipimpin jantan dewasa. Tidak terlihat adanya interaksi langsung dengan jenis primata lain di Pulau Majang, selain tumpang tindih habitat akan ketersediaaan pakan.
Keyword: Danau Sentarum National Park, Langur Borneo, social behaviors, social organization.

Judul: Elektrodeposisi Film Tipis Semikonduktor Cu2ZnSnS4 (CZTS) pada Substrat Kaca ITO
Abstrak: Semiconductor Cu2ZnSnS4 (CZTS) thin film that can be used as absorber layers on solar cell module was made via electrodeposition method. CZTS thin film was electrodeposited on the surface of a silicate glass coated with a thin layer of indium tin oxide (ITO). Deposition process was done using potentiostatic mode at room temperature with a potential of 1.05 V for 30, 45, and 60 minutes, followed with annealing the film at 2 different temperatures, 500 ºC using furnace and 180 ºC using hot plate, both treatments for 45 minutes in N2/H2S atmosphere. The X-ray difractograms were analyzed using Match 2 program and showed that the CZTS thin films had kesterit crystalline structure, with a low percentage of CZTS phase. The thin film also contained secondary phases such as Cu2S, ZnS, and SnS. The obtained CZTS thin films had a thickness between 1.039 and 1.676 μm. Absorption study showed that the band gap energy of CZTS thin films which was annealed using furnace ranged from 1.50 to 1.52 eV, whereas that annealed using the hot plate was not observed. The band gap energy value showed that CZTS thin films can be used as sunlight absorber layers on solar cell. The formation of CZTS crystal film on this investigation was effectively performed using furnace annealing process at a temperature of 500 ºC with deposition time of 45 minutes.
Keyword: Thin film, Electrodeposition, Cu2ZnSnS4