Judul: Beban Bahan Organik dan Kemampuan Self-Purification Sungai Jawi di Pontianak
Abstrak: Berkembangnya kegiatan penduduk di sepanjang aliran Sungai Jawi, seperti bertambahnya pemukiman penduduk, keberadaan pasar, rumah sakit dan lain-lain, yang umumnya membuang limbah di perairan sungai tenebd telah mempengaruhi kualitas airnya. Adanya beban masukan bahan-bahan organik yang dihasilkan oleh kegiatan penduduk, pada batas-batas tertentu tidak akan menurunkan kualitas air sungai.
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Judul: Study Of Water Quality And Pollutant–Loaded Capacity Of Kapuas River, Pontianak City, West Kalimantan.
Abstrak: The development of West Kalimantan especially in the surrounding area of Kapuas River contributes significantly to the pollution of the river. Some measures have undertake for reducing the pollutant load entering into the river. The objectives of this study are to determine the water quality and to analyze the pollutant – loaded capacity of Kapuas River, Pontianak. Samples were taken from five different stations, along the river in Pontianak City. Results of laboratory analysis were compered to the water quality standard (PP No. 82 /2001). STORET Method was used to determine the water quality status of each sampling station. The result of laboratory analysis showed that concentrations of TDS were approximately 21 – 1233 mg/L, Hg 16.41-27.01 ppb, Ammonia 0.3 – 0.98 mg/L, BOD 3.06 – 3.99 mg/L, COD 15 – 25 mg/L and Fecal Coliform 0.1 – 12 x 105 MPN/100 ml. These results show that the water quality of Kapuas River do not meet the stated water quality standard including physical, chemical and the microbiology parameters. Water of Kapuas River is no longer proper to be used as raw water for drinking water. The study of industrial waste water shows that the waste water is treated and met the waste water standard (KepMenLH No. 51/1991). Other pollutant sources may the cause of the Kapuas River pollution. Local Government Policies should be undertaken immediately to solve the pollution problem of Kapuas River, because the water of the river is nowdays used as raw water of PDAM in Pontianak.
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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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