Judul: Penyusunan Tabel Volume Lokal Jenis Nyatoh (Palaquium spp.) di IUPHHK-HA PT. Mamberamo Alasmandiri, Provinsi Papua.
Abstrak: Forest inventory is activities to know and obtain data along information about resources, potential values, and full of environments . The main objective of forest inventory activities is getting data about the condition of timber standing stock. To help forest inventory activities is needed supporting tools to facilitated this measurement and as well as to reduce human error that include tree’s volume table. PT. Mamberamo Alasmandiri have a heterogeneous diversity of tree’s species, one of them is nyatoh (Palaquium spp.). The main objective of this research is to establish local volume table nyatoh (Palaquium spp.). The volume table model using 150 trees that have been felled, selected by purpossive sampling. The regression equation that used including Berkhout equation, Kopezky- Gehrhardt, and Horenald-Krenn. Some of test that used for selecting the best model are analysis of variance, residual analysis, and outlier analysis. Validation model using Jacknife Procedures base on predicted residual sum of square (PRESS) value. The criteria used for selecting the best model is coefficient of determination (R²), adjusted coefficient of determination (Ra²), standard deviation (s), aggregate deviation (SA), average deviation (SR) and RMSE. The best model of nyatoh (Palaquium spp.) in IUPHHK-HA PT. Mamberamo Alasmandiri is V = 0,000158 Dbh2,48.
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Judul: The Local Volume Table Construction at IUPHHK-HA PT. Mamberamo Alasmandiri Work Area, Papua Province.
Abstrak: Untuk menyusun rencana pengelolaan hutan diperlukan data hasil inventarisasi hutan yang akurat. Keakuratan hasil inventarisasi hutan tergantung kepada beberapa hal, salah satunya adalah tersedianya tabel volume pohon untuk menduga volume pohon berdiri. Tabel volume pohon dibuat berdasarkan persamaan atau model matematis. Penelitian ini bertujuan untuk menyusun tabel volume pohon jenis Pometia pinnata di areal kerja IUPHHK-HA PT. Mamberamo Alasmandiri, Provinsi Papua. Adapun jenis tabel volume pohon yang dibuat adalah tabel volume pohon lokal dengan diameter pohon sebagai peubah bebasnya. Model penduga volume pohon disusun dalam 3 bentuk persamaan regresi dengan diameter sebagai peubah bebas. Model terbaik diperoleh berdasarkan kriteria uji statistik untuk keterandalan dan keabsahan model, yaitu koefisien determinasi (R²), simpangan baku (s), analisa keragaman, akar rata-rata kuadrat simpangan (RMSE), bias, simpangan rata-rata (SR), simpangan agregat (SA), dan uji beda rata-rata khi-kuadrat (χ²). Berdasarkan kriteria tersebut, model penduga volume matoa terbaik adalah V= dengan nilai R² = 97,8%, s = 0,082, Fhitung = 4753,55, RMSE = 30%, bias = 12%, SR = 21%, SA = 13,5%, dan χ²=6,115.
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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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