Judul: Stand Potential  Aren (Arenga pinnata Merr.) in Beruas and Teru Villages, Central Bangka Regency
Abstrak: Aren merupakan tumbuhan palma dari famili Arecaceae yang memiliki banyak manfaat dan bernilai ekonomi bagi masyarakat Desa Beruas dan Teru. Pemanfaatan aren bergantung pada aren yang tumbuh liar sehingga tingkat produksi aren rendah. Tujuan penelitian untuk menduga potensi tegakan dan produksi nira aren dan menyusun rencana pengembangan aren. Pengambilan data dilakukan dengan studi literatur, analisis vegetasi, pengamatan lapang, dan wawancara. Data dianalisis secara deskripsi kualitatif dan kuantitatif meliputi pendugaan tegakan aren, pola sebaran, kategori kelestarian, produksi nira aren, dan rencana pengembangan tegakan aren. Penelitian menemukan bahwa Desa Beruas memiliki 252 pohon aren dengan klasifikasi kelestarian fair, sementara Desa Teru memiliki 116 pohon dengan kelestarian good. Pola persebarannya cenderung mengelompok. Rata-rata produksi nira aren di Desa Beruas mencapai 11,38 liter per pohon per hari, sementara di Desa Teru belum ada tegakan yang menghasilkan nira aren. Pengembangan agroforestri dapat dilakukan di Desa Beruas, tetapi tidak memungkinkan di Desa Teru karena kondisi tempat tumbuhnya tidak sesuai., Aren is a palm plant from the Arecaceae family that has many benefits and economic value for the people of Beruas and Teru villages. Aren utilization depends on wild-growing aren palm so that the level of aren palm production is low. The aim of the study was to estimate the potential of aren palm stands, the production of aren palm sap, and to compose the development plan of aren palm. Data were collected through literature study, vegetation analysis, field observation, and interview. Data were analyzed qualitatively and quantitatively including estimation of palm stands, distribution patterns, sustainability categories, palm juice production, and development plans for palm stands. The study found that Beruas village has 252 aren palm trees with fair sustainability classification, while Teru village has 116 trees with good sustainability. The distribution pattern tends to be clustered. The average production of palm sap in Beruas village reached 11.38 liters per tree per day, while in Teru village there were no stands producing palm sap. Agroforestry development is possible in Beruas village, but not in Teru village due to the unsuitable growing conditions.
Keyword: aren, nira, pola sebaran, potensi

Judul: Aren (Arenga pinnata Merr.) Potential and  Development in Cambai, South Cambai and Air Mesu Villages, Central Bangka  Regency
Abstrak: Aren (Arenga pinnata Merr.) merupakan salah satu spesies tumbuhan dari famili Arecaceae yang memiliki potensi nilai ekonomi dan ekologi yang tinggi. Penelitian bertujuan menduga potensi tegakan aren, menduga potensi produksi nira aren dan merencanakan pengembangan tegakan aren di Desa Cambai, Cambai Selatan dan Air Mesu. Penelitian dilakukan dengan metode analisis vegetasi. Pohon aren yang siap berproduksi memiliki kerapatan jarang, sedangkan aren yang belum siap berproduksi memiliki kerapatan padat. Kategori kelestarian di ketiga lokasi penelitian cukup lestari (fair) dengan pola sebaran mengelompok. Nilai pendugaan potensi tegakan di Desa Cambai, Cambai Selatan dan Air Mesu secara berturut-turut 50 (ind/desa), 279 (ind/desa) dan 25 (ind/desa). Produksi nira aren tertinggi yaitu terdapat pada Desa Cambai Selatan sebesar 2.759,31 liter/desa/hari. Desa Air Mesu dan Desa Cambai Selatan merupakan desa prioritas pengembangan aren karena memiliki luas habitat potensial yang tinggi., Aren (Arenga pinnata Merr.) is one of the plant species from the Arecaceae family that has high potential economic and ecological value. The research aims to estimate the potential of aren palm stands, estimate the potential production of aren palm sap and plan the development of aren palm stands in Cambai, South Cambai and Air Mesu villages. The research was conducted using vegetation analysis method. Palm trees that are ready to produce have a sparse density, while palm trees that are not ready to produce have a dense density. The sustainability category in the three research locations is quite sustainable (fair) with a cluster distribution pattern. The estimated potential value of stands in Cambai, South Cambai and Air Mesu villages are 50 (ind/village), 279 (ind/village) and 25 (ind/village) respectively. The highest production of palm sap was found in South Cambai Village at 2,759.31 liters/village/day. Air Mesu Village and South Cambai Village are priority villages for palm oil development because they have a high potential habitat area.
Keyword: aren, habitat potensial, potensi, produksi

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.
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