Judul: Struktur, Fungsi dan Dinamika Keanekaragaman Hayati Pertanian Pada Pekarangan di Hulu DAS Kalibekasi, Kabupaten Bogor
Abstrak: Indonesian typical home garden, “pekarangan”, has several ecological potentials of agrobiodiversity. Nevertheless, pekarangan management in Indonesia is facing several problems, such as decreasing plot size, decreasing plant species for production function, but increasing number of ornamental plants for aesthetic function. The objectives of this research are to propose recommendations on agrobiodiversity conservation in pekarangan by analyze the structure, function and spatial dynamic of pekarangan agrobiodiversity in the upper stream of Kalibekasi watershed. This research was conducted in Cimandala, Landeuh and Leuwijambe hamlets which represented the upper part, the middle part and the lower part of the upper stream of Kalibekasi Watershed, respectively, and Sentul City as the urbanized area for comparison. There are 48 samples of pekarangan were observed and analyzed. It was found that pekarangan in the rural area of the upper stream of Kalibekasi watershed have larger space in front yard and one of side yard, but smaller in back yard with multilayer plants. The main function of pekarangan in rural area is a media for production, but in urban area are for micro-climatic amelioration and aesthetic function. The numbers of Margalef index and Shannon-Wiener index show that the upper part has the highest plant diversity. While, the values of Sørensen coefficient indicate that the middle part is the transition place of species similarity of the upper and the lower part. The proposed recommendation is to hold and maintain pekarangan with high diversity of plants and livestocks, which householders get benefit from the product.
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Judul: Model Pekarangan Ekologis di Hulu DAS Kalibekasi, Kabupaten Bogor.
Abstrak: Integrated watershed landscape management is needed from the upperstream to the downstream watershed to keep the sustainable watershed ecosystem in Kalibekasi watershed area. Research objectives are to identify the characteristics of pekarangan in Kalibekasi upperstream watershed area and to create some recommendation of ecologic pekarangan models. This research use ecological pekarangan indicator approach. In the small and the medium pekarangan, ornamental plants are often founded. Whereas in the large and the extra large pekarangan, non-ornamental plants area often founded. This can be caused by if we want to plant nonornamental plant, larger area is needed. The larger pekarangan size has more function than smaller one, due to it has more diversity of plant function in those pekarangan. Aesthetics function of pekarangan is often founded in the small and the medium pekarangan. This caused by many ornamental plants founded in those pekarangan. On the other hand, economics function is often founded in the large and the extra large pekarangan. Productive plant species will give more additional income. Front yard of pekarangan is usually used for socializing. Side yard usually is used for service area. The backyard is usually used for private area. Pekarangan model made based on ecological pekarangan indicators.
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Judul: Elektrodeposisi Film Tipis Semikonduktor Cu2ZnSnS4 (CZTS) pada Substrat Kaca ITO
Abstrak: Semiconductor Cu2ZnSnS4 (CZTS) thin film that can be used as absorber layers on solar cell module was made via electrodeposition method. CZTS thin film was electrodeposited on the surface of a silicate glass coated with a thin layer of indium tin oxide (ITO). Deposition process was done using potentiostatic mode at room temperature with a potential of 1.05 V for 30, 45, and 60 minutes, followed with annealing the film at 2 different temperatures, 500 ºC using furnace and 180 ºC using hot plate, both treatments for 45 minutes in N2/H2S atmosphere. The X-ray difractograms were analyzed using Match 2 program and showed that the CZTS thin films had kesterit crystalline structure, with a low percentage of CZTS phase. The thin film also contained secondary phases such as Cu2S, ZnS, and SnS. The obtained CZTS thin films had a thickness between 1.039 and 1.676 μm. Absorption study showed that the band gap energy of CZTS thin films which was annealed using furnace ranged from 1.50 to 1.52 eV, whereas that annealed using the hot plate was not observed. The band gap energy value showed that CZTS thin films can be used as sunlight absorber layers on solar cell. The formation of CZTS crystal film on this investigation was effectively performed using furnace annealing process at a temperature of 500 ºC with deposition time of 45 minutes.
Keyword: Thin film, Electrodeposition, Cu2ZnSnS4