Judul: Heavy Metal Pollution in Gunung Putri Swamp Waters, Bogor
Abstrak: Rawa Gunung Putri merupakan ekosistem perairan tawar yang sumber airnya berasal dari air hujan dan mata air. Keberadaannya di kawasan industri Gunung Putri menyebabkan rawa ini rentan terhadap pencemaran aliran limbah industri maupun penduduk. Penelitian ini bertujuan menganalisis kandungan logam berat Pb dan Cd baik di air, sedimen dan biota ikan dan katak, dilakukan pada 3 plot contoh hulu-tengah-hilir rawa. Analisis logam berat di Laboratorium Terpadu IPB menggunakan metode AAS. Hasil penelitian menunjukkan logam Pb dan Cd tidak terdeteksi di air rawa, tetapi terdeteksi Pb pada sedimen di ketiga plot contoh. Pb pada ikan terdeteksi antara <0,2-0,27 mg/kg, serta Pb pada katak <0,2-0,27 mg/kg. Tidak terdeteksinya Pd dan Cd di air rawa diduga karena tidak adanya sumber limbah cair industri sekitar rawa yang menghasilkan limbah logam berat, serta penyerapan logam berat oleh tumbuhan air rawa dan mengendapnya logam bersama partikel tersuspensi ke dasar rawa. Adapun Pb pada daging ikan dan katak melebihi bakumutu daging konsumsi yang telah ditetapkan.
Keyword: logam berat, pencemaran, rawa gunung putri

Judul: Kandungan Logam Berat Pb dan Cd pada Sedimen di Waduk Saguling, Bandung, Jawa Barat
Abstrak: Saguling Reservoir is a reservoir that received water flow from the Citarum River, which was pouled by many industrial wastes. These wastes contain heavy metals such as Pb and Cd that contaminated water, sediment and biota in the reservoir. The observation on the sediment, is expected to give a results about nominal level of the heavy metal pollution in that reservoir. The result showed that the content of heavy metal Pb and Cd was 8.623 ppm and 0.721 ppm. The value of both heavy metals at each station states that the levels of heavy metal pollution in sediments has exceeded the standard quality by EPA (1987) in the Laws (1993). In comparison with the content of heavy metals in water, sediment has a greater concentration with an average ratio of 11:1. Whereas v sediment in comparison with the content of heavy metals in Tutut, they have a smaller concentration values with an average ratio of 0.4:1. Distribution value of the heavy metal Pb and Cd in Saguling Reservoir have the same pattern, is high in inlet, and then decrease in the middle and increase surpass the inlet. The recommended supervision to reduce waste pollution in Saguling, is the implementation of the waste water treatment (IPAL) to industries that dispose their wastes to the water.
Keyword: Saguling Reservoir, Heavy metals, Pollution

Judul: Construction of Strongly Optimal Binary Linear Code with Minimum Distance 9 and 11
Abstrak: A binary linear code of length n over q F is a subspace of n q F . A code has three parameters that attached to it, namely length, dimension, and minimum distance. A code with length n, dimension k and minimum distance d is often called [n, k, d ]-code. Usually, when two parameters are given, then we want to find a code that has the best value for the last parameter. Based on Gilbert- Varshamov bound, if a [n, k, d ]-code exists and can not be expanded, we call it a strongly optimal code. In this paper, we construct strongly optimal code with minimum distance 9 and 11. In constructing the code, we created a theorem and algorithm based on Gilbert-Varshamov bound before we implement the algorithm to MAPLE programming language. Because of computational limitations, the program can only construct up to k = 10 for d = 9 and k = 12 for d = 11.
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