Judul: Karakteristik Habitat Tangkap dan Parameter Demografi Populasi Panenan Labi-labi Amyda cartilaginea (Boddaert 1770) di Provinsi Kalimantan Tengah.
Abstrak: Amyda cartilaginea (Boddaert 1770) is one of harvested turtle species in Indonesia, mainly for consumption purpose in oriental countries. In order to prevent over-exploitation and the declining of the population, harvesting has been limited by quota. However, there is still too few supporting data, that can be used as a basis to determine the quota. The research was aimed to identify characteristics of catchment habitat, and also the demography and morphometric parameters of A. cartilaginea in Central Kalimantan Province. The result showed that harvested population of A. cartilaginea was dominated by adult females within the range weight of 3 – 5 kilograms of body mass. Two statistical tests were applied to describe the characteristic of catchment habitat of A. cartileginea in Central Kalimantan. Chi-square test on the types of land cover suggested that A. cartileginea catchment habitat had a specific condition. Index Neu showed that the catchment habitat were swamp and river (w=10,17; w=6,28 respectively). Binary logistic regression was used to construct a model which explained the dominant variables influencing the number of A. cartileginea at a certain point of habitat. There were four biophysical variables that significantly drove the number of catchment of A. cartileginea, and all were negatively correlated with number of catchment.
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Judul: Tata Niaga, Parameter Demografi Populasi Panenan dan Karakteristik Habitat Labi-labi Amyda cartilaginea (Boddaert 1770) di Provinsi Jambi.
Abstrak: Asian soft-shell turtle (Amyda cartilaginea Boddaert, 1770) has been recorded as the most harvested turtle species in Indonesia, mainly for consumption purpose in oriental countries. In order to prevent over-exploitation and the declining of the population, harvesting has been limited by quota. In practice, the harvesting still showed an enormous number and the determination of the quota itself was not yet based on the data of Amyda population. This research was aimed to identify mortality rate through identification of the trading system since for highly-valued species harvesting was the major cause of mortality. The demographyc and morphometric parameters were measured to characterize the harvested population by its size, sex ratio, age-class and range of bodymass and carapace length. Twenty dissected speciments were observed to study the reproduction condition of different size of Amyda, thus used to estimate potential lost caused by harvesting. Amyda’s habitat was characterized by measuring 9 biophysical variables of each of 90 fishing plots in 16 rivers and 3 lakes. The result showed that the size of harvested population of Amyda at the trader level was different from one to another, but showed similar trends of domination in sex and age class which were adult females and reaching the number of 58.28%. The people dealing with the harvesting activities of Amyda had no preference for size and sex of the harvested animal. Reproduction condition of the observed Amyda showed that at the size of five kilograms, the females were at the age of maturity. Kolmogorov-Smirnov test on the habitat biophysical variable on stream showed that Amyda had no habitat preference.
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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