Judul: Condition of Waters in Pejarakan Mangrove Ecosystem, Buleleng, Bali Based on Water Quality Status
Abstrak: Kawasan ekosistem mangrove Pejarakan, Bali merupakan salah satu perairan yang memiliki hutan mangrove terluas di Kabupaten Buleleng dan dikelola untuk konservasi serta edukasi. Masukkan limbah antropogenik ataupun pertambakkan dari sekitar wilayah tersebut dapat mempengaruhi perubahan kualitas air. Penelitian ini bertujuan untuk mengevaluasi kondisi perairan yang mencakup beberapa parameter fisika dan kimia sebagai dasar penentuan status kualitas air di wilayah tersebut. Penelitian dilakukan di kawasan mangrove Pejarakan, Bali pada 6 titik stasiun sejak September 2022, Januari 2023, September 2023, dan Januari 2024. Metode analisis yang digunakan meliputi indeks pencemaran (IP), CCME-WQI, dan STORET. Berdasarkan hasil pengamatan, suhu (28,7-37,4°C), pH (7,47-8,49), DO (3-7,6 mg/L), kekeruhan (0,17-18,75 mg/L), TSS (2,8-38,6 mg/L), nitrat (0,02-0,05 mg/L), amonia (0,05-0,5 mg/L), total fosfat (0,01-0,75 mg/L) yang diperoleh umumnya perairan berstatus tercemar ringan untuk metode indeks pencemaran (IP) dan STORET, serta kondisi cukup baik untuk metode CCME-WQI., Pejarakan mangrove ecosystem area, Bali is one of the largest mangrove forests in Buleleng Regency and is managed for conservation and education. The input of anthropogenic waste or aquaculture from around the area can affect changes in water quality. This study aims to evaluate water conditions that include several physical and chemical parameters as a basis for determining the status of water quality in the region. The research was conducted in Pejarakan mangrove area, Bali at 6 station points since September 2022, January 2023, September 2023, and January 2024. The analysis methods used include pollution index (IP), CCME-WQI, and STORET. Based on the observation results, temperature (28.7-37.4°C), pH (7.47-8.49), DO (3-7.6 mg/L), turbidity (0.17-18.75 mg/L), TSS (2.8-38.6 mg/L), nitrate (0.02-0.05 mg/L), ammonia (0.05-0.5 mg/L), total phosphate (0.01-0.75 mg/L) obtained generally waters are mildly polluted for the pollution index (IP) and STORET methods, and fair condition for the CCME-WQI method.
Keyword: CCME-WQI, Pejarakan, Pollution Index, STORET, Water Quality.

Judul: Tingkat Pencemaran di Perairan Pantai Bojonegara, Teluk Banten Berdasarkan Parameter Fisika-Kimia Perairan
Abstrak: Kondisi kualitas air yang baik di suatu perairan sangat penting untuk mendukung keberlangsungan hidup organisme yang hidup di dalamnya. Penentuan status mutu suatu perairan penting dilakukan dalam menduga kondisi pencemaran suatu perairan. Penelitian ini bertujuan mengkaji status mutu air dan indeks pencemaran perairan pantai Bojonegara, Teluk Banten. Pengambilan sampel dilakukan pada bulan Januari-Februari dan bulan Agustus-Oktober 2020 dari enam stasiun penelitian. Parameter yang dianalisis antara lain suhu, salinitas, kecerahan, kekeruhan, TSS, pH, DO, nitrat, dan fosfat total. Hasil analisis yang diperoleh dibandingkan baku mutu berdasarkan PP No 22 Tahun 2021. Berdasarkan hasil pengamatan suhu (28.4-37.5oC), salinitas (0-38 ppt), kecerahan (0.05-4.7 m), kekeruhan (1.1-380 mg/l), TSS (0.7-415 mg/l), pH (6.63-8.2), DO (3.3-7.5 mg/l), nitrat (0.001-0.745 mg/l), dan fosfat total (0.001-0.377 mg/l), menunjukan bahwa sebagian parameter masih tergolong dibawah baku mutu, beberapa parameter kurang sesuai dengan baku mutu perairan (antara lain TSS, kekeruhan, nitrat, dan fosfat total). Berdasarkan hasil perhitungan indeks pencemaran perairan pantai Bojonegara memiliki indeks pencemaran kategori tercemar ringan hingga sedang (2.988-7.561)., Good water quality conditions in marine environment are important to support the survival of living organism, and hence, needed to estimate the status of water pollution. Determination of water quality status is needed to do in estimating the condition of water pollution. This study aims to examine the status of the water quality and water pollution index of Bojonegara coastal waters, Banten Bay. Sampling was carried out in January February and August-October 2020 at six stations. Parameters analyzed included temperature, salinity, transparency, turbidity, TSS, pH, DO, nitrate, and total phosphate. The results were compared with the water quality standards based on Gov. Reg. No 22 of 2021. Based on the observations of temperature (28.4-37.5oC), salinity (0-38 ppt), transparency (0.05-4.7 m), turbidity (1.1 -380 mg/l), TSS ( 0.7-415 mg/l), pH (6.63-8.2), DO (3.3-7.5 mg/l), nitrate (0.001-0.745 mg/l), and total phosphate (0.001 - 0.377 mg/l), indicating that some parameters were still below the quality standard and some parameters were not in accordance with the water quality standard (including TSS, turbidity, nitrate, and total phosphate). Based on the results of the calculation of the pollution index, Bojonegara coastal waters were classified into the light to moderately polluted category (2.988-7.561).
Keyword: Baku mutu, Bojonegara, indeks pencemaran, kualitas air

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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