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: Sebaran Konsentrasi Fosfat (PO4-P) dan Nitrat (NO3-N) sebagai Indikator Kesuburan Perairan di Teluk Jakarta
Abstrak: Teluk Jakarta terletak di pantai utara Pulau Jawa merupakan muara bagi 13 sungai besar di Jakarta, Bogor, Depok, Tangerang, dan Bekasi. Berbagai aktivitas yang melibatkan pemanfaatan perairan baik teluk maupun sungai dapat menyebabkan penurunan kualitas perairan dan pengayaan nutrien. Salah satu akibat pengayaan nutrien yaitu peningkatan nutrien seperti fosfat dan nitrat yang dapat memengaruhi produktivitas perairan. Penelitian ini bertujuan menganalisis sebaran konsentrasi fosfat dan nitrat di Teluk Jakarta secara spasial dan temporal. Pemantauan kualitas air dilakukan antara tahun 2012 hingga 2019 sebanyak delapan kali pengamatan dari 23 stasiun. Penentuan 23 stasiun berdasarkan keterwakilan wilayah Teluk Jakarta. Berdasarkan kandungan fosfat dan nitrat, perairan Teluk Jakarta terrmasuk subur. Pola sebaran spasial fosfat dan nitrat konsentrasinya lebih tinggi di sekitar pantai dan semakin rendah seiring mendekati mulut teluk. Secara temporal, konsentrasi fosfat dan nitrat menunjukkan perbedaan yang signifikan cenderung meningkat dari tahun ke tahun., Jakarta Bay is located on the north coast of Java Island and is the mouth of 13 major rivers in Jakarta, Bogor, Depok, Tangerang, and Bekasi. Various activities that involve the use of waters, both bays and rivers, can cause a decrease in water quality and nutrient enrichment. One result of nutrient enrichment is an increase in nutrients such as phosphate and nitrate which can affect water productivity. This study aims to analyze the spatial and temporal distribution of phosphate and nitrate concentrations in Jakarta Bay. Water quality monitoring was carried out between 2012 and 2019 in eight observations from 23 stations. Map of 23 stations based on the representativeness of the Jakarta Bay area. Based on the content of phosphate and nitrate, the waters of Jakarta Bay are considered fertile. The pattern of spatial distribution of phosphate and nitrate concentrations is higher around the coast and lower as they approach the mouth of the bay. Temporally, the concentrations of phosphate and nitrate showed significant differences which tended to increase from year to year.
Keyword: temporal, Jakarta Bay, nitrate, phosphate, spatial

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.
Keyword: