Judul: Keterkaitan Tata Guna Lahan terhadap Kondisi Indeks Pencemaran di Teluk Jakarta
Abstrak: Teluk Jakarta dikelilingi oleh kawasan strategis nasional yang padat aktivitas. Kegiatan antropogenik berpotensi terhadap perubahan tata guna lahan. Adanya aliran sungai berpotensi membawa masukan nutrien ke perairan dan menyebabkan pencemaran. Penelitian ini menjelaskan keterkaitan tata guna lahan terhadap kondisi indeks pencemaran di Teluk Jakarta. Penelitian ini menggunakan data penelitian pada 23 stasiun pengamatan di Teluk Jakarta tahun 2019 dan 2022. Analisis dilakukan terhadap 9 parameter kualitas air, seperti suhu, pH, DO, BOD5, nitrat, fosfat, kekeruhan, TSS, dan total coliform. Tata guna lahan di sekitar Teluk Jakarta tidak mengalami perubahan yang besar. Perubahan ini juga tidak secara besar memengaruhi perubahan nilai setiap parameter indeks pencemaran. Indeks pencemaran di Teluk Jakarta pada tahun 2019 dan 2022 secara umum berstatus tercemar ringan. Kondisi indeks pencemaran tidak secara signifikan dipengaruhi oleh tata guna lahan di sekitar Teluk Jakarta, tetapi juga dipengaruhi oleh aktivitas antropogenik di daerah hulu sungai (up land)., Jakarta Bay is surrounded by a national strategic area that is full of activity. Anthropogenic activities have the potential to change land use. The existence of a river flow has the potential to bring nutrient inputs into the waters and cause pollution. This study explains the interconnectedness between land use and pollution index conditions in Jakarta Bay. This study used research data from 23 observation stations in Jakarta Bay in 2019 and 2022. Analysis was carried out on 9 water quality parameters, such as temperature, pH, DO, BOD5, nitrate, phosphate, turbidity, TSS, and total coliform. The land use around Jakarta Bay has not changed significantly. This change also does not significantly affect changes in the value of each pollution index parameter. The pollution index in Jakarta Bay in 2019 and 2022 is generally lightly polluted. The condition of the pollution index is not significantly affected by land use around Jakarta Bay, but is also influenced by anthropogenic activities in the upland area.
Keyword: anthropogenic, Jakarta Bay, land use, pollution index, water quality

Judul: Water quality and land use around Sunter 1 Lake, DKI Jakarta
Abstrak: Meningkatnya jumlah penduduk di DKI Jakarta berpotensi menyebabkan terjadinya perubahan tata guna lahan yang berpengaruh terhadap peningkatan jumlah limbah yang dihasilkan di badan air. Salah satu badan air yang terancam tercemar oleh limbah dari aktivitas manusia adalah Danau Sunter 1. Penelitian ini bertujuan menganalisis status kualitas air dan tata guna lahan di sekitar Danau 1, DKI Jakarta. Penelitian ini menggunakan data sekunder kualitas air Danau Sunter 1 tahun 2019, 2021, dan 2022. Penelitian dilakukan selama dua periode dengan tiga titik pengambilan sampel. Status kualitas air Danau Sunter 1 dianalisis menggunakan Indeks Pencemaran (IP), sedangkan data tata guna lahan dianalisis menggunakan software Google Earth Engine (GEE) dan ArcGIS. Kualitas Air Danau Sunter 1 tergolong dalam kategori cemar ringan, cemar sedang dan cemar berat. Lahan terbangun merupakan penggunaan lahan yang memiliki luasan paling mendominasi, sedangkan semak merupakan penggunaan lahan dengan luasan terendah. Tingginya lahan terbangun dikarenakan peningkatan populasi jumlah penduduk di Jakarta Utara yang menyebabkan adanya konversi menjadi lahan terbangun., The increasing population in DKI Jakarta has the potential to cause land use changes that affect the increase in the amount of waste generated in water bodies. This study aims to analyze the status of water quality and land use around Sunter 1 Lake, DKI Jakarta. This study used secondary data on the water quality of Lake Sunter 1 in 2019, 2021, and 2022. The research was conducted over two periods with three sampling points. The water quality status of Sunter 1 Lake was analyzed using the Pollution Index (IP), while land use data was analyzed using Google Earth Engine (GEE) and ArcGIS software. The water quality of Sunter 1 Lake is categorized as lightly polluted, moderately polluted and heavily polluted. Built-up land is the land use that has the most dominating area, while shrubs are the land use with the lowest area. The high amount of built-up land is due to the increase in population in North Jakarta, which has led to conversion to built-up land.
Keyword: water quality, Sunter 1 Lake, land use

Judul: Konstruksi Hukum Grup Kurva Eliptik Atas F3m
Abstrak: Elliptic curves upon F3m can be divided in two cases, i.e. supersingular and nonsupersingular case. Based on group laws on elliptic curves, a new arithmetic upon F3m can be formulated as an addition process of two random points on the curve. This addition process can then be applied to the ElGamal algorithm.
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