Judul: Analysis of Home Range and Habitat Suitability Model of The Large Flying Fox (Pteropus vampyrus) in West Java Province
Abstrak: Kalong memiliki wilayah jelajah yang luas sehingga pemodelan distribusi spasial diperlukan untuk mengidentifikasi kesesuaian habitatnya. Satwa ini memiliki peranan penting bagi ekosistem meskipun dipercaya sebagai reservoir virus. Penelitian ini bertujuan untuk menganalisis pergerakan harian, wilayah jelajah, variabel yang berpengaruh terhadap kesesuaian habitat dan risiko virus nipah di Provinsi Jawa Barat. Titik perjumpaan dua individu kalong direkam pada tahun 2017-2018 menggunakan satellite telemetry ARGOS (Advanced Research and Global Observation Satellite). Analisis pergerakan harian dan wilayah jelajah menunjukkan hasil yang berbeda dari kedua individu dengan kecenderungan untuk tidak berpindah jauh dari titik awal perekaman. Nilai akurasi model kesesuaian habitat menunjukkan hasil sangat baik (AUC 0,975) dengan pengaruh variabel tertinggi yaitu curah hujan dan suhu. Salah satu habitat yang sesuai untuk kalong terdapat di Cagar Alam Leuweung Sancang. Pemetaan area risiko virus nipah menunjukkan sedikit lokasi yang memiliki risiko tinggi dalam penyebaran virus nipah., The large flying fox has a wide home range so that spatial distribution modelling is required to identify the suitability of its habitat. This animal has an important role for the ecosystem although it is believed to be the reservoir of viruses. This study aims to analyze the daily movement, home range, variables that affect habitat suitability and risk of nipah virus in West Java Province. The presence point of the two individuals was recorded in 2017-2018 using ARGOS satellite telemetry. Analysis of daily movements and home ranges showed different results from both individuals with a tendency not to move far from the starting point of recording. The accuracy value of the habitat suitability model shows excellent results (AUC 0.975) with the highest variable influence of rainfall and temperature. One of the suitable habitats for kalong is found in Leuweung Sancang Nature Reserve. Mapping the risk area of nipah virus shows few locations that have a high risk in the spread of nipah virus.
Keyword: kalong, habitat, pergerakan harian, virus nipah, wilayah jelajah

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: Characterizations of low alloy steel sae 4422  plated with chromic acid (Cro3)
Abstrak: Characterizations of low alloy steel SAE 4422 plated with chromic acid (CrOrO3) was use Optical Microscopy (OM), Scanning Electron Microscopy (SEM), X-Ray Diffraction (XRD), RD),Energy Dispersive Analysis of X-Ray (EDAX), Hardness Test and Roughness Test. Microstructures analysis exhibits cracks and grain boundaries microcracks as a characteristics of chrome metal found at plating metal. Perlite and Ferrite as grains of steel found at base metal with grain boundaries around it. Phase analysis of plating metal appropriate to chrome metal with lattice constant (a) is 2.559 Å and phase analysis of base metal appropriate to iron ferrite with lattice constant (a) is 3.318 Å. Both plating and base metal have cubic system. Chemical analysis of plating metal at surface section exhibits that cracks area have highest value of carbon element compare with grains and grains boundaries area. While chemical analysis of base metal at cross section exhibits that perlite have highest value of carbon element compare with ferrite and grain boundaries. The hardness value of plating metal at surface section and cross section are 753 and 637 VHN. While, the hardness value of base metal and interface area at cross section are 205 and 373 VHN. The roughness value at measurement points of chrome surface for as received sample are 0.445 μm. Observation used Optical Microscopy and Scanning Electron Microscopy exhibits surface irregularities combine to form surface texture of plating metal at surface section.
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