Judul: The Relationship Between Plankton  Community Structure and Water Conditions in Margagiri Grenyang Beach,  Banten Bay
Abstrak: Pantai Margagiri-Grenyang memiliki berbagai kegiatan industri yang dapat mengganggu kestabilan kondisi perairan dan struktur komunitas organisme di wilayah tersebut. Penelitian ini bertujuan menganalisis komposisi dan kelimpahan jenis plankton, indeks keanekaragaman, keseragaman, dan dominansi, serta keterkaitannya dengan kualitas perairan di kawasan perairan tersebut. Penelitian ini dilakukan pada bulan Juli sampai November 2022 dengan enam stasiun. Parameter yang dianalisis meliputi kualitas air, fitoplankton dan zooplankton. Struktur komunitas plankton dianalisis menggunakan pendekatan indeks biologi. Fitoplankton dan zooplankton yang ditemukan berturut-turut terdiri dari enam kelas dan lima kelas. Genus fitoplankton yang mendominasi berasal dari Bacillariopyceae, sedangkan untuk zooplankton berasal dari genus Protozoa. Hasil pengamatan menunjukkan indeks keanekaragaman, keseragaman, dan dominansi fitoplankton secara berturut-turut sebesar 1,2733-2,5515; 0,3849-0,8003; dan 0,1106-0,4912. Adapun untuk zooplankton secara berturut-turut sebesar 1,6310-2,1476; 0,7723-0,8996 dan 0,1509-0,2414. Berdasarkan struktur komunitas yang terbentuk terlihat bahwa plankton masih dapat tumbuh dan berkembang. Struktur komunitas plankton di perairan Margagiri-Grenyang mencerminkan kondisi keadaan stabil dan terjadi tekanan ekologis terhadap biota di habitat tersebut., Margagiri-Grenyang Beach has various industrial activities that can destabilize the water conditions and community structure of organisms in the area. This study aims to analyze the composition and abundance of species plankton, diversity index, evennes, and dominance, and their relationship with water quality in the water area. This research was conducted from July to November 2022 with six stations. The parameters analyzed include water quality, phytoplankton, and zooplankton. The plankton community structure was analyzed using the biological index approach. Phytoplankton and zooplankton found consisted of six classes and five classes, respectively. The dominating phytoplankton genus comes from Bacillariopyceae, while for zooplankton comes from the genus Protozoa. The observation results showed that the indices of diversity, evennes, and dominance of phytoplankton were 1.2733-2.5515; 0.3849-0.8003; and 0.1106-0.4912, respectively. As for zooplankton, they were 1.6310-2.1476; 0.7723-0.8996 and 0.1509-0.2414, respectively. Based on the community structure formed, it appears that plankton can still grow and develop. The structure of the plankton community in the Margagiri-Grenyang waters reflects stable conditions and ecological pressure on the biota in the habitat.
Keyword: Banten Bay, plankton, structure community, water quality.

Judul: Zooplankton Community Structure in Banten Bay to Describe the Health of the Aquatic Environment
Abstrak: Perairan Teluk Banten merupakan wilayah perairan yang dipengaruhi oleh berbagai aktivitas seperti kegiatan industri maupun berbagai aktivitas manusia sehingga dapat dikhawatirkan dapat menyebabkan penurunan kondisi perairan serta perubahan komposisi dan kelimpahan zooplankton. Penelitian ini bertujuan untuk menganalisis kondisi perairan Teluk Banten berdasarkan struktur komunitas zooplankton untuk menggambarkan kesehatan lingkungan perairan. Pengambilan contoh dilaksanakan pada bulan Oktober hingga Desember 2021, meliputi19 stasiun di muara Sungai Berung, muara Sungai Cibanten, muara Sungai Pamong, serta 16 stasiun di perairan laut. Parameter kualitas air yang diukur meliputi suhu, salinitas, kecerahan, dan klorofil-a. Analisis data meliputi kelimpahan zooplankton, indeks keanekaragaman, keseragaman, dan dominansi. Sebaran kelimpahan zooplankton dianalisis menggunakan Surfer 16 (Golden Software). Hubungan klorofil-a dan zooplankton dianalisis menggunakan regresi linear. Zooplankton yang ditemukan selama penelitian terdiri dari 29 genera dan 1 stadia. Zooplankton didominasi oleh Copepoda dan organisme yang mendominasi secara keseluruhan adalah krustasea Nauplius stadia. Kelimpahan zooplankton di perairan Teluk Banten berkisar 13,47–305,09 ind/L. Persebaran zooplankton lebih tinggi di area dekat pantai dan semakin rendah ke arah sisi luar teluk. Struktur komunitas zooplankton memiliki keanekaragaman rendah, keseragaman besar, dan dominansi rendah-sedang. Kelimpahan zooplankton berkorelasi signifikan dengan klorofil-a., Banten Bay is estuary that are affected by various human activities such as industrial and non-industrial activities, which can cause concerns about the decline in water quality conditions and changes in the composition and abundance of zooplankton. This research aims to analyze estuary conditions based on the structure of the zooplankton community to describe the health of the aquatic environment. Sampling and measurements were carried out from October to December 2021 at 19 stations, including the river mouth of Berung River, Cibanten River, Pamong River, and 16 other sea sites stations. Water quality parameters measured include temperature, salinity, water clarity, and chlorophyll-a. Data analysis includes zooplankton species abundance, diversity index, uniformity and dominance. The distribution of zooplankton abundance was analyzed using Surfer 16 (Golden Software). The relationship between chlorophyll-a and zooplankton was analyzed using linear regression. The zooplankton found during the research consisted of 29 genera and 1 stage. Zooplankton community was dominated by Copepods and the Nauplius of Crustacea dominates overall community. The abundance of zooplankton in the Banten Bay ranges from 13.47–305.09 ind/L. The distribution of zooplankton near the coast tends to be higher and lower towards outer side of the bay. The zooplankton community structure has low diversity, great uniformity, and low - medium dominance. The relationship between chlorophyll-a and zooplankton shows that zooplankton abundance can be influenced by chlorophyll-a.
Keyword: zooplankton, abundance, structure community, Banten Bay

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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