Judul: Kajian Status Trofik Dan Daya Dukung Perairan bagi Kegiatan Karamba Jaring Apung Di Waduk Saguling Jawa Barat
Abstrak: Saguling Reservoir as multipurpose reservoir have many problem, one of that is organic matter loading with two sources. Internal source of organic matter loading is floating cage aquaculture. The Purpose of this study was to estimate status trophic and carrying capacity for floating cage aquaculture in Waduk Saguling. Most of floating cage cultivated cat fish (Pangasius sp) with artifical feed which contain 1,19% of phospat. Several of water quality parameter exceed quality standar, that means there has been contamination of organic material in the Saguling reservoir. Dissolved Oxygen content can reached lower than 1 mg/l on inlet reservoir, dissolved oxygen content can not support the growth of aquatic organisms in maximal condition. Based of trophic classification using TRIX method, the productivity of the Saguling Reservoir has reached eutrophic level. Estimating water carrying capacity use phosporus budget model was found that total acceptable production to be 12.460 tons/year. Keywords : Trophic Status, Carrying Capacity, Saguling Reservoir, Floating Cage Aquaculture Based on interview data, fish production in Saguling is 2,76 tons / year / cage. The result is show that amount of cage which safe for water is 4514 cage units. Current Amount of active floating cage is 7209 units. This amount of present floating cage has exceed the maximum value of carrying capacity so that need to effective policy to manage floating cage activity.
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Judul: Analisis Kandungan Nutrien (N, P) dan Pendugaan Status Kesuburan di Waduk Saguling, Jawa Barat
Abstrak: Saguling Reservoir is man made lake that stem the flow of Citarum River. It has a major function as a hydropower and fisheries activities supporting floating cage. Nutrien input from Citarum River and KJA potentially increase the trophic state of Saguling Reservoir. Research was conducted from November 2012 until January 2013. Sampling was done in 3 stations of Saguling Resevoir (inlet, middle, and outlet). Water quality parameters include physics, chemistry, and biology was observed in this research. Nutrien concentration was analyzed from N:P ratio. Trophic state was estimated from TSI. Ratio of N: P showed a value of 24.2 which means P is the limiting factor in Saguling Reservoir. The value of TSI showed hypertrophic condition but characteristic of hypertrophic didn’t show during observed in Saguling Reservoir.
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Judul: The Exploration of Discrete Logarithm over Finite Field GF(3m)
Abstrak: The security of many public~key algorithms is based on the problem of finding discrete logarithms. The generalized discrete logarithm problem is the following: given a finite cyclic group G of order n, a generator a of G, and an element fl E G, find the integer x, 0 ~ x ~ n - 1, such that 0: = fl. Algorithm for discrete logarithm problem focused on Menezes et al. (1997) that consist of exhaustive search algorithm, the baby-step giant-step algorithm, Pollard's rho algorithm, Pohlig-Hellman algorithm, and index-calculus algorithm. These algorithms are explorated to be used in discrete logarithm problem over finite field GF(3m ). The exploration also produces some algorithms, i.e. naif negative algorithm, baby-step mother-step algorithm, baby-step mother free-step algorithm, and baby-step free-step algorithm. All algorithms implemented using Maple 11. The Pohlig-Hellman and baby-step giant-step algorithms are efficient enough to be used in discrete logarithm problem over finite field GF(3m ) for m < 20.
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