Judul: Kajian beban pencemaran Sungai Cikao Kabuapten Purwakarta
Abstrak: Kondisi Sungai Cikao saat ini diperkirakan telah mengalami penurunan kualitas air disebabkan berbagai aktivitas manusia. Penelitian ini bertujuan untuk mengidentifikasi sumber pencemar air Sungai Cikao, menghitung besar beban pencemaran setiap sumber-sumber pencemar dan dampak beban pencemaran (BP) terhadap kualitas air dan membandingkan besar BP dengan daya tampung beban pencemaran (DTBP). Analisis beban pencemaran dilakukan melalui pendekatan Rapid Assesment, sedangkan status pencemaran dianalisis dengan metode Storet. Hasil identifikasi menunjukkan bahwa sumber pencemar dominan di sekitar Sungai Cikao adalah limbah permukiman, pertanian, peternakan dan industri, dengan total beban pencemaran terhadap nilai BOD sebesar 478.188 ton/bulan, COD sebesar 941.418 ton/bulan, TSS sebesar 240.840 ton/bulan dan TN sebesar 242.274 ton/bulan. Selisih antara DTBP terhadap BP pada nilai BOD sebesar -3 755.593 ton/tahun, COD sebesar 5 225.217 ton/tahun, TSS sebesar 3 718.810 ton/tahun dan TN sebesar 30 069.427 ton/tahun. Hasil analisis status pencemaran dengan metode Storet menunjukkan bahwa kualitas air di Sungai Cikao termasuk kategori tercemar berat
Keyword: Cikao River, pollution resource, waste discharge, water quality

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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