Judul: Chemical Parameters Distribution in Bojonegara Coastal Water Banten Bay
Abstrak: Penelitian ini bertujuan menganalisis persebaran parameter kimia di Teluk Banten dan menduga hal yang mempengaruhi persebaran tersebut. Parameter kimia kualitas perairan terdiri dari pH, oksigen terlarut (DO), nitrit, nitrat, dan fosfat. Pengambilan sampel air laut dilakukan secara langsung di lapangan (in situ) yang terdiri dari parameter suhu, kecerahan, kedalaman, pH dan DO. Parameter yang tidak dapat dilakukan secara in situ, dilakukan dengan mengambil sampel air untuk diamati di laboratorium (ex situ). Analisis data dilakukan menggunakan aplikasi Surfer untuk membuat sebaran spasial dari parameter yang telah diambil. Sebaran kimia yang dibuat terdapat enam parameter masing-masing dilakukan sebaran pada bulan Januari, Februari, Agustus, September, Oktober 2020 lalu dianalisis berdasarkan hasil sebaran tersebut. Berdasarkan sebaran tersebut dapat dilihat bahwa sebaran parameter kimia pada lokasi penelitian dipengaruhi oleh pengaruh dari arah arus, musim, pasang surut, aktivitas manusia dan industry, selain itu sebaran parameter kimia juga mempengaruhi satu sama lain., This study aims to analize chemical parameters distribution in Banten Bay and guess the factors that influence the distribution. Water quality chemical parameters consist of pH, dissolved oxygen (DO), nitrite, nitrate, and phosphate. Sea water sampling that taken observed in-situ consist temperature, brightness, depth, pH and DO. Parameters that could not be taken observed in—situ then would be done by taken water sample to be taken observed in the laboratory (ex-situ). Data analysis done by using Surfer software to create spasial distribution of the parameters that have been taken. There are 6 chemical parameters distribution and each consist in 5 months which are January, February, August, September, October 2020 and then analyzed based on the distribution results. Based on the distribution, could be seen that chemical parameters distribution in research location influenced by currents, climate, tides, and human and industrial activities. Other than that, chemical parameters distribution could influence each other.
Keyword: Bojonegara Beach, chemical distribution, chemical parameters, physical parameters

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: Grup dan Homomorfisma Grup pada Rubik Revenge
Abstrak: Rubik cube is a kind of puzzle game. A player must arrange rubik sides, which have been disordered, back to the position where every side has the same colour. This paper does not focus on the settlement solution, but instead on proving the existence of a group homomorphism between rubik movement group and S96 symmetric permutation group in rubik revenge. Firstly, it has been proved that rubik movement set is a group. Then, it also has been proved that the M set, which contains numeric labels of 1 until 96 in cubinos sides, is S96 symmetric permutation group.
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