Judul: Habitat Characteristics and Feed Preferences of Bornean Langur (Presbytis chrysomelas ssp. cruciger Thomas 1892) at the Lupak Mawang Resort, Danau Sentarum National Park
Abstrak: Langur borneo adalah primata endemik pulau Kalimantan dikategorikan terancam punah (critically endangered) oleh IUCN. Tujuan dari penelitian ini adalah untuk mengidentifikasi karakteristik habitat, mengidentifikasi jenis dan preferensi pakan, serta menganalisis ketersediaan pakan langur borneo. Penelitian dilaksanakan di Resort Lupak Mawang, Taman Nasional Danau Sentarum pada bulan Juli hingga Agustus 2021. Metode pengambilan data yang digunakan yaitu pengamatan langsung dan wawancara, sedangkan metode analisis data menggunakan vegetasi untuk menganalisis dan mendeskripsikan karakteristik habitat. Hasil pengamatan menunjukan bahwa langur borneo menempati wilayah dengan ketinggian 32-257 mdpl dan kemiringan lahan 24%-45%. Aktivitas harian langur borneo lebih sering dilakukan pada strata tajuk C (4-18) m di hutan primer dan campuran. Aktivitasnya dimulai pukul 05.00 hingga 17.30 yang ditandai dengan vokalisasi. Langur borneo mengkonsumsi 27 jenis tumbuhan dari 16 famili. Persentase bagian tumbuhan yang dimakan langur borneo yaitu daun 50%, buah 30%, dan biji 20%. Langur borneo memiliki preferensi terhadap buah gita susu (Willunghbeia coriacea) yang berhabitus liana dengan persentase 36%., Bornean langur is a primate endemic to Borneo is categorized as critically endangered by the IUCN Red List. Information on the population condition and habitat of the bornean langur in Indonesia is still limited. The research was carried out at the Lupak Mawang Resort, Danau Sentarum National Park from July to August 2021. The data collection methods used were direct observation and interviews. The vegetation analysis method was used to describe its habitat characteristics. The observations shows that the bornean langur occupies an area altitude of 32 – 257 meters above sea level and a land slope of 24%–45%. The daily activities of the bornean langur are more often carried out in the C canopy strata of (4-18 m) in primary dan mixed forest. The activity starts at 05.00 until 17.30 which is marked by vocalization. The bornean langur consumed 27 species of plants from 16 families. The plant parts percentage eaten by the bornean langur are 50% leaves, 30% fruit, and 20% seeds. Bornean langur has a preference for gita milk fruit (Willunghbeia coriacea) as liana habitus plant with a percentage of 36%.
Keyword: Langur borneo, Jenis tumbuhan pakan, Karakteristik habitat

Judul: Habitat Characteristics and Diet of Langur Borneo at Pulau Majang Resort, Danau Sentarum National Park
Abstrak: Langur Borneo (Presbytis chrysomelas ssp. cruciger Thomas 1892) merupakan primata endemik Borneo yang memiliki wilayah persebaran sempit dengan status perlindungan kritis menurut daftar merah IUCN. Penelitian ini bertujuan mengidentifikasi karakteristik habitat langur Borneo; mengidentifikasi jenis tumbuhan pakan, bagian yang dimakan, dan jenis pakan lain; serta menganalisis ketersediaan jenis tumbuhan pakan langur Borneo. Penelitian dilaksanakan di Resort Pulau Majang, Taman Nasional Danau Sentarum dengan pengambilan data lapangan dilaksanakan pada Juli-Agustus 2021. Pengumpulan data dilakukan dengan pengukuran langsung, observasi lapangan, dan studi literatur. Di Resort Pulau Majang hanya dijumpai pada hutan sekunder dengan suhu harian berkisar antara 24,70oC-29,15oC dengan kelembapan harian antara 81,50%-99%. Teridentifikasi 8 jenis tumbuhan pakan langur dengan persentase tertinggi bagian yang dimakan adalah buah (63,64%). Hal tersebut disebabkan oleh waktu penelitian bersamaan dengan musim buah bukit. Nilai kerapatan dan kerapatan relatif pada semai dan pancang lebih tinggi dibandingkan pada tiang dan pohon. Hal tersebut menunjukkan bahwa ketersediaan pakan di lokasi penelitian terbilang cukup baik., Langur Borneo (Presbytis chrysomelas ssp. cruciger Thomas 1892) is an endemic primate of Borneo that has a critically endangered status according to the IUCN Red List. This study aims to identify habitat characteristics of the langur Borneo; identify the types of their feed plants, the parts that were eaten, and other types of feed; and analyze the availability of the langur Borneo’s feed. This research was carried out at Pulau Majang Resort, Danau Sentarum National Park in July- August 2021. Data were collected by direct measurements, field observations, and literature studies. Langur Borneo at Pulau Majang Resort was only found in secondary forests with daily temperatures ranging from 24,70 ̊C–29,15 ̊C and daily humidity between 81,50%-99%. Eight types of food plants of langur were identified with the highest percentage of the part eaten as fruit (63,64%). The hill fruit season made it the common finding of langur’s feed. Density and relative density values at each growth rate of seedlings and saplings are higher than poles and trees. This shows that the availability of langur Borneo’s feed at Pulau Majang Resort is quite good.
Keyword: Diet, habitat characteristics, Langur Borneo

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