Judul: Kapasitas asimilasi beban pencemaran di muara sungai batang arau (muara padang) sumatera barat
Abstrak: Sungai Batang Arau adalah satu-satunya sungai yang bermuara ke Muara Padang. Sepanjang sungai dan sekitar muara dipadati oleh bermacam-macam aktifitas manusia seperti pertanian, pemukiman, rumah sakit dan pelabuhan. Hasil penelitian sebelumnya menunjukkan adanya indikasi pencemaran di Sperairan Muara Padang yang disebabkan oleh berbagai aktifitas tersebut. Kondisi ini pada akhirnya akan mengganggu kehidupan biota di dalamnya serta menyebabkan terganggunya nilai estetika lingkungan padahal kedepannya Pemerintah Kota Padang mengagendakan kawasan Muara Padang sebagai salah satu daerah wisata yang terletak dijantung Kota Padang. Tujuan dilaksanakannya penelitian ini adalah menggali informasi tentang kualitas perairan Muara Padang (fisika, kimia dan biologi) serta kapasitas asimilasi Muara Padang dalam menampung bahan pencemar yang masuk. Pengambilan sampel dilakukan selama periode Maret-April 2005 pada 7 stasiun penelitian meliputi sampel air, sedimen dan biota serta data-data sekunder. Analisa terhadap parameter kualitas air (TSS, DO, BOD5, COD, NO3, NO₂ dan NH3) menunjukkan bahwa kondisi perairan Stasiun 1 dan 2 sudah tidak mendukung kehidupan biota di dalamnya (melebihi baku mutu berdasarkan Kepmen No. 51/MENLH/2004) sedangkan Stasiun 3, 4, 5, 6 dan 7 masih baik dan layak untuk biota. Kondisi kualitas air ini didukung oleh 3 jenis sedimen yang ditemukan di lokasi penelitian, Stasiun 1 dan 2 didominasi oleh lempung dan lempung berliat, Stasiun 3 dan 4 oleh lumpur dan Stasiun 5, 6 dan 7 oleh pasir. Bahan organik sedimen yang paling banyak dijumpai adalah N-Organik dan secara umum, masih mendukung kehidupan biota di dalamnya. Kondisi kualitas air dan sedimen didukung oleh parameter biologi seperti keragaman makrozoobentos yang rendah di Stasiun 1 dan 2. Adapun stasiun lainnya memiliki keragaman yang sedang. Kondisi yang sedikit berbeda ditemukan pada fitoplankton. Secara umum, keragaman fitoplankton tergolong sedang di semua stasiun penelitian. Walaupun demikian, tidak ditemukan jenis tertentu yang mendominasi baik fitoplankton maupun makrozoobentos. Tipe pasut Muara Padang adalah semi diumal tides dan analisa terhadap proses percampuran menunjukkan Muara Padang tergolong estuari tercampur sebagian (Partially mixed estuary). Kapasitas asimilasi perairan Muara Padang berada dalam kondisi belum terlampaui. Hal ini tergambar dari nilai beban pencemar (BP) beberapa parameter (TSS, NO3, NH3, dan PO₁) masih di bawah nilai kapasitas beban (KB) Muara Padang dalam menampungnya baik pada saat pasang maupun surut. Kondisi ini disebabkan oleh hidrodinamika yang dinamis dan waktu pembilasan (flushing time) yang berlangsung relatif cepat (6,832 hari atau 53 kali/tahun) sehingga beban pencemar yang ada di muara segera terangkut ke laut dan terencerkan. IPB
Keyword: Kualitas air, Kualitas sedimen, Fitoplantektion, Makrozoobentos, Analisa STORET, Analisia data, Ekosistem

Judul: Kajian Beban Pencemaran dan Kualitas Air Sungai Batang Arau di Kota Padang
Abstrak: Development activities in the area of the watershed of a Batang Arau were very intensively with the increase of population that high as the impact of high dynamic of development in the town of the field. Padang has the development of population growth rate 1,09 % according to data from the central bureau of statistics Padang City in 2010. It is in line with the course of economic Padang City. Economic activities of micro agriculture, industry (industry small to large industries) or mining was the backbone of the economy padang. However, with increasing population, development and the economy in padang thought to have an undesired effect negative into the environment are increasing the loads of pollution in the watershed of a Batang Arau in particular the Batang Arau River. The accumulation of the burden of contaminant on the upstream to downstream will make the level of pollution Batang Arau River more tainted. The purpose of this research is a) identify sources contaminant the waters of the Batang arau River at Padang City, b) evaluate developments water quality of the Batang Arau River from upstream to downstream during the period 2008-2012 and c) knowing pollution load any sources contaminant and a capacity of the burden of pollution Batang Arau River. The technique of adoption of the data used in this research is by means of observations, inventorying sources of pollution on the Batang Arau River and an interview with the methods purpossive of sampling. In addition, was also performed by collecting data secondary through the study of literature and examine documents. The condition of the quality of the water of the Batang Arau River analysis based on government regulation of the republic of Indonesia number 82 in 2001. The status of the quality of the water of the uses index the quality of water national sanitation foundation (IKA-NSF). Calculation the pollution loads from various sources contaminant carried out through the approach of rapid assessment of sources of water, polution, water and land while calculation capacity of the burden of pollution according to the decision of the state minister of environment No.110 in 2003. Contaminant sources in Batang Arau River at Padang city is waste from domestic/household, industry, agriculture and mining. Water quality of Batang Arau Rivers was decresing from upstream to downstream. The development of the water quality of Batang Arau River showed that on the upper and middle of the River, the river water quality meets quality raw rods or class II PP 82/2001, while in the downstream river water quality meets quality raw rods or class IV PP 82/2001. Based on the water quality index value, The Batang Or Padang city in 2008-2012 in moderate to good conditions that are in the range of 53-72 in the rainy season and 56-74 during the dry season. The burden of the most heavily contributed to pollution into the Batang Arau River is industrial waste (tons/month 152.905, 9 of BOD, 139.456, 3 ton/month of COD, 124.858 ton/month of TSS and 10.885.106 ton/month of TDS) followed by mining wastes (0 ton/month of BOD, 316.480 ton/month
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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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