Judul: Pollution Burden Analysis and Assimilation Capacity of Cidurian River Banten Province
Abstrak: The river has the ability to clean itself of the burden of pollution naturally which is known as the capacity of assimilation. Incoming load exceeds the capacity of assimilation would lead to a decrease in the quality of the river until the river functions decline. This research aims to analyze the water quality of Cidurian River, analyze the contribution of pollution loads entering River Cidurian, and knowing the assimilation capacity of the stream. Research results show that the water quality, starting from the upstream to downstream concentrations of BOD, TSS, COD and E. coli are likely to exceed the standard of quality. Contribution to the total burden of polluters from certain sources (point source) in DAS Cidurian 2,4 tons/month BOD, COD 4,3 tons/month, TSS 2,26 tons/month. The contribution burden of polluters undefinable (non point source) based on the analysis of land use from agricultural sector BOD 206,76 tons/month,TSS 24,13 ton/month, based on the analysis of the population of each sub DAS, domestic sector have 1.374 tons/month of BOD, COD 1.890 tons/month, TSS 1.305 tons/month and E.coli 1,02 E 16 tons/month. Total contribution burden of polluters undefinable (non point source) parameters BOD 1.580 tons/month, COD 1.890 tons/month, TSS 1.324 tons/month, more dominant compared to certain sourced (point source). Capacity of assimilation to the parameters of TSS 22.901,55 tons/month, BOD 2.347,83 tons/month, COD 24.208,33 tons/month, E.coli 424.629,90 tons/month. Overall value of assimilation capacity is smaller compared to the burden of pollution of the river, resulting in the organic matter pollution experienced TSS, BOD, COD and E.coli. The high contribution to the burden of domestic source of polluters and agriculture, as well as the capacity of assimilation to consider in an attempt to control water pollution.
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Judul: Kajian Beban Pencemaran dan Daya Tampung Beban Pencemaran Sungai Ciliwung Hulu Segmen Kabupaten Bogor
Abstrak: Water quality (KA) of the upstream of Ciliwung River was important affecting the efforts to comply water necessities for community’s activities. Thus there need a study to determine the change of KA due to waste discharge (BP) that flow into stream. The objectives of this research were to identify river’s utilization, source of pollutant, to evaluate condition of river’s KA, and to calculate BP and BP capacity (DTBP). Literature review method was used to collect secondary data that consisted of KA, demography, tourism, total of livestock, total area of farming land and total of industry. Primary data were collected by using field observation and interview to the community. Used analysis method was Rapid Assessment of Sources of Air, Water and Land Pollution to determine status quality of water and BP; meanwhile DTBP was calculated based on BMA class I (PP No 82 of 2001) and utilization of river and source of pollutant were analyzed descriptively. Main source of BP was from river utilization by community which includes domestic, animal husbandry and farming wastes. Main BP couldn’t be contained anymore due to limited DTBP of river. Total of BP excesses were, respectively, 7.3356 ton month¹ BOD, 1005.82 ton month¹ COD and 478.29 ton month¹ TSS. Generally, quality status of upstream Ciliwung River’s water in 2008-2012 was ranged between moderately polluted to fine; it could be seen from parameters such as BOD, COD, phosphate, DO, TSS and total coli that have been exceding BMA.
Keyword: water quality, source and waste discharge, capacity

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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