Judul: Distribution and Population of Proboscis Monkeys  (Nasalis larvatus Wurmb 1781) in Sepandan Resort Danau Sentarum National Park.
Abstrak: Bekantan merupakan satwa yang dilindungi pemerintah dengan status terancam punah (endangered species). Taman Nasional Danau Sentarum mengalami masalah biofisik (kebakaran hutan, konversi hutan, perburuan) yang mengancam kelestarian bekantan. Penelitian bertujuan menduga populasi dan mengetahui persebaran serta mendeskripsikan faktor yang mempengaruhi sebaran bekantan di Resort Sepandan. Penelitian dilaksanakan pada bulan Juli-Agustus 2022 menggunakan metode line transect, concentration count, wawancara, analisis vegetasi, dan diperkuat dengan studi literatur. Kepadatan populasi bekantan di Resort Sepandan sebesar 1,94 individu/km2 presentase. Nisbah kelamin bekantan di resort sepandan yaitu 1:2. INP tertinggi pada tutupan riparian, hutan rawa gambut, dan lahan terbuka Sentarum saat musim kemarau secara berurutan yaitu temirit (Timonius flavescens) 157,03%, kawi (Shorea balangeran) 164,27%, dan laban (Vitex pubescens) 128,30%. Parameter biotik yang berpengaruh terhadap sebaran bekantan berupa pakan, aktivitas manusia, predator, dan kompetitor. Persentase jenis tumbuhan pakan bekantan sebesar 41,67%. Parameter abiotik yang mempengaruhi pergerakan bekantan yaitu curah hujan, suhu, kelembaban, dan kondisi air danau. Bekantan sering dijumpai pada pagi dan sore hari dengan rerata suhu 26,31°C dan 30,72°C serta rerata kelembaban 90,18% dan 78,09%.
Keyword: Bekantan, Populasi, Sebaran, distribution, population, proboscis monkey

Judul: Habitat Suitability Modelling of Proboscis Monkey (Nasalis larvatus Wurmb, 1781) in Sekonyer River Tanjung Puting National Park, Central Kalimantan
Abstrak: Bekantan (Nasalis larvatus) merupakan spesies endemik pulau Kalimantan yang meliputi wilayah Indonesia, Malaysia, dan Brunei. Sebaran spesies ini terbatas pada habitat tertentu yang meliputi hutan bakau, hutan rawa, dan hutan riparian. Laju deforestasi habitat bekantan cukup tinggi sehingga berdampak pada penurunan populasi bekantan. Penelitian dilakukan pada bulan Februari-April 2020, dengan melakukan pengamatan di sepanjang aliran Sungai Sekonyer untuk mengetahui sebaran dan kondisi habitat. Analisis MaxEnt dilakukan untuk mendapatkan model serta nilai kontribusi variabel kesesuaian habitat. Hasil penelitian menunjukkan terdapat 47 jenis tumbuhan dari 27 famili yang 4 diantaranya merupakan pakan paling disukai bekantan. Kondisi habitat di Kawasan hutan sekitar Sungai Sekonyer dapat dikatakan baik, dilihat dari nilai kerapatan yang tinggi dari setiap tingkat pertumbuhannya. Habitat bekantan di Sungai Sekonyer sudah sesuai, dilihat dari masih tersedianya sumber kebutuhan hidup bekantan seperti sumber air, pakan, dan tempat berlindung. Model kesesuaian habitat bekantan dapat diterima dengan nilai AUC sebesar 0,966. Variabel kesesuaian habitat bekantan yang memiliki kontribusi paling besar adalah sungai dan tutupan lahan hutan rawa., he proboscis monkey (Nasalis larvatus) is an endemic species to Borneo's island and is largely confined to mangrove, riverine, and swamp forests. The rate of deforestation and habitat loss of the proboscis monkey is a significant threat to decreasing their population. This research was conducted during February-April 2020 by making observations along the Sekonyer River of Tanjung Puting National Park to determine the distribution and condition of the habitat. Using the maxent analysis, the model and the value of the contribution of the habitat suitability variable were obtained. There were 47 species of vegetation (27 families), four species were the most preferred food of proboscis monkeys. Habitat conditions in the forest area around the Sekonyer River were still quite good, seen from each growth rate's high-density value. The proboscis monkey habitat in the Sekonyer River was suitable, as seen from the availability of sources of life necessities such as water, food, and shelter. The proboscis monkey's habitat suitability model was acceptable with an AUC value of 0.966. The proboscis monkey's habitat suitability variables that had the most significant contribution were rivers and swamp forest land cover.
Keyword: Habitat suitability, proboscis monkey, Tanjung Puting National Park

Judul: Pembuatan Sel Fotoelektrokimia Padat dengan Struktur ITO/CdS/Elektrolit/ITO
Abstrak: photoelectrochemical solid cell in ITO/CdS/Electrolyte/ITO structure has been succesfully composed through this research. The photoelectrochemical cell material is a layer of cadmium sulfide deposited onto an ITO-covering glass substrate. The CdS layer is used as a working electrode of the cell. The solid electrolyte used is a combination of chitosan-PEG-KI/I2. The concentration of KI/I2 was varied from 0.1/0.01 M to 0.5/0.05 M. The current-voltage output of the cell was measured under a light illumination of a tungsten lamp and the sun. The output voltage found increases around 50% when the KI/I2 consentration was raised from 0.1/0.01 M to 0.5/0.05 M. When the radiation intensity increased from 1.074 mW/m2 to 4.147 mW/m2, Voc voltage increased around threefold, Isc current increased around twice, and power efficiency increased around twice at a fixed concentration. The highest efficiency of the solar cells (on singlecell measurements) obtained at the concentrations of 0.5/0.05 M KI/I2. In a circuit consist of 4 solar cells, the highest power eficiency and FF produced by the serial circuit.
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