Judul: Keanekaragaman dan Kelimpahan Arthropoda pada Perkebunan Teh 0-300 meter dari Tepi Hutan di PTPN VIII Gunung Mas, Kabupaten Bogor
Abstrak: Knowledge of pests and natural enemies diversity and abundance on the tea plantation is the essential considetarion for pest control descision by integrated pest management system. This study, conducted in PTPN VIII Gunung Mas tea plantation during 3 months, considered the effect of forest edge through tea boundaries (0-100, 100-200, 200-300 meters from forest edge) on diversity, abundance and family function proportion of Arthropods by pitfall trap, sweep net and branches beating methods for a week. Totally, the classes of Arthropod are Arachnida (3 orders, 19 families, and 1383 species), Diplopoda (3 orders, 6 families, and 27 species) and Insecta (13 orders, 73 families, and 5048 species). The 0-100 meters tea plantation from forest edge has highest number of Arthropods diversity. The highest number of Arthropods abundance is in 100-200 meters from forest edge. A lot of Arthropods have a role as predator on tea plantation (55.53% from total Arthropods). The proportions of herbivore, detrivore, parasitoid, and other are 21.52%, 20.94%, 1.38%, and 0.63%.
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Judul: Keanekaragaman dan Kelimpahan Arthropoda pada Perkebunan Teh 300-600 m dari Tepi Hutan di PTPN VIII Gunung Mas, Bogor
Abstrak: Pest control with synthetic pesticides causes various negative influences, on the environment, plant, or human health and safety. The concept of integrated pest control (IPC) began to be developed as an alternative. Understanding on the diversity and abundance of arthropods in an ecosystem is the basic consideration to implement the IPC system. The research is conducted to identify the diversity and abundance of arthropod in tea plantations within 300-600 m from edge of the forest in Gunung Mas PTPN VIII. Sampling was conducted from March until May 2013. The sampling location is in areas of tea plantations within 300-400, 400-500, to 500-600 m from the forest edge. Arthropod sampling method is to use insect netting, branches beating, and using pitfall trap. Observation performed 12 times with one week interval between observations. Number of arthropods obtained in the observations is 4403 individuals consisting of 18 orders and 58 families. Arthropod diversity was highest in locations 300-400 m from the forest edge. Arthropod abundance was highest at locations 400-500 m from the forest edge. The proportion of predatory arthropods obtained the highest is 52%, then 27% herbivor, detrivor 20%, and parasitoids and other insects about 1%.
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Judul: Pembuatan Film Tipis Cu2ZnSnS4 sebagai Lapisan Penyerap Cahaya pada Sel Surya Menggunakan Metode Elektrodeposisi
Abstrak: Thin film of Cu2ZnSnS4 (CZTS) is an alternative semiconductor used as light absorber layer on solar cell. CZTS can replace silicon that commonly used as commercial semiconductor. The advantage of using CZTS as absorber layer is due to the abundance of its chemical composer on earth, and its high value of absorption coefficient. The absorber layer was made by using electrodeposition method on ITO glass substrates. The films were deposited at room temperature using potentiostatic mode with a potential of –1.05 V for 30, 45, and 60 minutes. After that, the films were annealed at two different temperatures, 180 ºC and 500 °C, for 45 minutes in N2/H2S atmosphere. Based on X-ray diffraction analysis, the polycrystalline thin film obtained fall into kesterite crystal phase. This type of crystal was obtained when the CZTS was annealed at 500 °C in H2S/N2 atmosphere. The value of optical band gap energy for the CZTS thin film was 2.2 eV with the film thickness about 1.228–6.366 μm. The sample of CZTS with electrodeposition time of 45 minutes and annealing temperature of 500 °C showed the best result and in conformity with absorber layers criteria for solar cells.
Keyword: semiconductor, ITO glass, CZTS thin film, electrodeposition