Judul: Studi kesaksamaan beberapa persamaan Regresi guna pendugaan volume tegakan meranti (Shorea spp) di kalimantan tengah
Abstrak: Penelitian ini dilakukan dengan tujuan untuk mengetahui kesaksamaan/ketelitian beberapa Persamaan Regresi yang dapat digunakan untuk menyusun tabel volume Meranti (Shorea spp) di Kalimantan Tengah. Data yang digunakan berupa 178 pohon model Meranti (Shorea spp) dari Kalimantan Tengah yang dikumpulkan oleh Peneliti dari Badan Penelitian dan Pengembangan Kehutanan, Bogor. Penggunaan angka bentuk batang umum 0,7 untuk menduga volume pohon dari semua jenis pohon dipandang kurang memenuhi kebutuhan praktek, karena menghasilkan dugaan volume pohon dengan kesalahan dugaan yang relatif besar. Untuk mengatasi masalah dalam pendugaan volume pohon Meranti (Shorea spp) di Kalimantan Tengah, telah diteliti penggunaan persamaan-persamaan regresi yang diharapkan menghasilkan dugaan volume yang lebih akurat.
Keyword: Shorea spp.

Judul: Model Penduga Tabel Volume Pohon Meranti di PT Inhutani II Sub Unit Malinau Kalimantan Utara.
Abstrak: Kegiatan inventarisasi hutan merupakan hal yang penting untuk dilakukan untuk mengetahui potensi suatu tegakan dalam areal hutan. Tabel volume pohon Meranti (Shorea spp.) dibuat untuk membantu memperoleh taksiran volume tegakan dari jenis pohon tersebut di areal kerja PT Inhutani II Sub Unit Malinau. Sebanyak 100 pohon contoh diambil dari lokasi penelitian. Penyusunan model regresi terdiri dari 5 model persamaan dengan 3 persamaan menggunakan 1 peubah bebas dan 2 persamaan menggunakan 2 peubah bebas. Pemilihan model terbaik berdasarkan nilai koefisien determinasi terkoreksi (R2adj), F hitung, dan simpangan baku (s) untuk tahap penyusunan model dan nilai simpangan agregat (SA), simpangan rata-rata (SR), root mean square error (RMSE), Bias, dan chi-square (χ2) untuk tahap validasi model. Hasil penelitian menunjukkan bahwa persamaan terbaik yang diperoleh yaitu V = 15.48817 D2.45 dengan nilai R2adj 98.50%, simpangan baku 0.7, simpangan agregat -0.08, simpangan rata-rata 0.84, RMSE 0.32%, dan bias 0.22%.
Keyword: meranti, model regresi, tabel volume

Judul: Enzymatic Fuel Cell (EFC) used carbon-polyaniline nanoparticle composite bioanoda with amobolized Glucose Oxidase (GOD).
Abstrak: Polyaniline nanoparticles is one of the conductive polymer which used as a matrix in the manufacture bioanoda in biofuell cell applications. Polyaniline was synthesized by the interfacial polymerization method interfacial two-phase system of organic solvent or water. Products such as polyaniline precipitate was collected and purified by filtrating. The powder was characterized by SEM for morphology structure analyzing of polyaniline surface porous, the analyzing result of particle size was 60 nm. Characterization of TEM showed the thinnest layer of the sample, the morphologically formed groups or aggregations such as fiber to the size of the average particle diameter of 60-80 nm. The crystallinity of X-ray diffraction results showed partial or semi-crystalline structure of polyaniline with an average crystal size was 10.4 nm. Generally, the diffraction pattern indicates that extends sequence crystallinity of polyaniline nanocrystal structure. FTIR analysis indicated that the sample obtained was a conductive polyaniline forms or emeraldine salt (ES). Polyaniline addition on carbon paste electrode observed in voltammogram curve. The oxidation peak in potential 0,4 and 0,6 V, and the reduction peak was seen at -0,1 and 0,8, although it does not look so sharp. The using of glucose oxidase enzyme in solution is less economical, because the enzyme can not be used repeatedly. For using efficiently of enzymes in analyzing and production process, the enzyme immobilization technique was developed. Immobilization of enzymes were applied to produce electron. Polyaniline (PANI nanoparticles) with nanoscale structures with small particle size which had a large surface area, used as a matrix be able to bind the enzyme free and able to maintain the stability of the catalytic activity of the enzyme better. It can be used as an electrode material for anode reaction process on the EFC. Enzymatic fuel cell is an electrochemical technology converted chemical energy into electricity. The driving force is called enzymatic fuel cells are from glucose oxidase enzyme as a bio-catalyst. It also has a high specificity for glucose substrate. The observation result by lower concentration of glucose (0.25 M) produced higher current (5,05 μA). Increasing of glucose concentration( 0,50 M; 0,75M; 1 M) decresed of current results (2,45 μA; 1,69 μA; 1,35 μA). The same thing happens on observations of potential, with a low glucose concentration (0.25 M) produces a high voltage value of 60.8 mV, but decrease voltage value (20.3 mV; 20.8 mV; 15.4 mV) with increasing concentrations of glucose (0.50 M, 0.75 M, 1 M) The value obtained maximum power density was 0.39 μW/cm2 at low glucose concentrations (0,25 M) with increasing concentrations of glucose (0.50 M, 0.75 M, 1 M) decresed the value of the power density (0.071 μW/cm2, 0.044 μW/cm2, 0.026 μW/cm2). The glucose with lower concentration can produced maximum electrical by current, voltage and power density. The values obtained maximum power density was 0.39 μW/cm2.
Keyword: polyaniline, electroda bioanoda, dan enzymatic fuel cell