Judul: Perbandingan Bentuk Unit Contoh pada Penerapan Sampling dalam Pendugaan Potensi Tegakan Akasia
Abstrak: Bentuk unit contoh dalam inventarisasi hutan yang diterapkan Perum Perhutani menggunakan bentuk unit contoh lingkaran. Selain bentuk unit contoh lingkaran terdapat juga bentuk unit contoh jumlah pohon yang dapat diterapkan di hutan tanaman. Penelitian ini bertujuan membandingkan tingkat ketelitian dan efisiensi berbagai bentuk unit contoh pada penerapan sampling tegakan akasia di RPH Maribaya BKPH Parung Panjang KPH Bogor. Sebanyak 44 unit contoh berupa lingkaran berukuran 0.02 ha, 0.04 ha, dan 0.1 ha serta jumlah pohon sebanyak 5, 6, 7, 8, 9, dan 10 dipilih secara acak pada setiap kelas umur dengan metode stratified sampling. Perbandingan terhadap hasil pendugaan parameter tegakan yang meliputi kerapatan, luas bidang dasar, dan volume pada setiap unit contoh untuk menentukan bentuk unit contoh yang teliti dan efisien. Hasil penelitian menunjukkan bahwa unit contoh lingkaran 0.02 ha memiliki tingkat ketelitian terbaik dan efisiensi relatif tertinggi pada pendugaan tegakan akasia.
Keyword: metode stratified sampling, tingkat ketelitian dan efisiensi, unit contoh jumlah pohon, unit contoh lingkaran

Judul: Studi Penerapan Metode Pohon Contoh (Tree Sampling) Dalam Pendugaan Potensi Tegakan Akasia (Acacia mangium Willd.) di BKPH Parung Panjang KPH Bogor Perum Perhutani Unit III Jawa Barat
Abstrak: Inventarisasi hutan dilaksanakan untuk mengetahui dan memperoleh data dan informasi tentang sumberdaya hutan, potensi kekayaan hutan serta lingkungannya secara lengkap. Data hasil kegiatan inventarisasi hutan harus memiliki tingkat keakuratan yang tinggi dengan memperhatikan efisiensi dalam pengambilan data baik dari segi waktu, tenaga dan biaya. Dalam kaitannya dengan inventarisasi hutan, telah dikembangkan berbagai metode baik teknik pengambilan data, penggunaan bentuk unit contoh maupun pengolahan datanya.
Keyword: 

Judul: Hybrid solar cells of ZnO nanoparticles/chlorophyll was modified metal ions (Zn2+ and Cu2+ )
Abstrak: Zinc Oxide (ZnO) is a n-type semiconductor with a wide the energy band (Band Gap) is 3.37 eV at room temperature and 3.34 eV at low temperature with a large exiton binding energy is 60 meV. ZnO has been synthesized by hydrothermal method, resulting in a decrease in particle size over the duration of the hydrothermal changes. Crystallographic structure of ZnO were characterized using XRD, has shown the characteristic pattern of a hexagonal wurtzite structure, the crystallite size increases to changes in particle size. Changes in particle size has also led to a change in the absorption peak of ZnO as has been demonstrated posted under test using the optical properties of UV-Vis spectrophotometer. Changes of this uptake has also led to changes in the energy band gap, which increases its band gap energy of the particle size. In electronic applications, especially in solar cells. Chlorophyll is considered less effective, because of their very nature are easily degraded as a result of several reactions which are acid, lighting and temperature. The results of the stability test using a halogen lamp 34 W/m2 for 5 hours, that the substitution of chlorophyll with metal ions Zn2+ and Cu2+ has been shown to form more stable than natural chlorophyll. The characterization of the optical properties, the combination of ZnO / chlorophyll in the form of hybrid films has led to a shift in the absorption region of ZnO becomes more widely from the UV to Visible. ZnO/chlorophyll has absorption range of 350-515 nm, ZnO / Zn-feofitin 332-401 nm and 332-632 nm for Cu-feofitin. The combination of ZnO/chlorophyll and CuSCN as a solid electrolite in hybrid solar cell, a modified chlorophyll with metal ions Zn2+ and Cu2+ has been shown to form a more stable I-V curve. It is characterized by its fill factor value greater than natural chlorophyll. Nevertheless, solar cells with natural chlorophyll has been able to produce higher efficiency values of chlorophyll were substituted.
Keyword: Hydrothermal, ZnO/Chlorophyll modified, Hybrid Solar Cell