Judul: Penentuan Beban Fosfat di Perairan Situ Cilala, Desa Jampang, Kabupaten Bogor, Jawa Barat
Abstrak: Nutrients are one of determining factors in the development of water ecosystem. The relationship between nutrients and algae growth can be determined by identifying the source and magnitude of nutrient inputs to waters (nutrient budget). Determination of phosphorus budget can be determined by identifying and calculating the amount of P input to waters and P output from waters. The purpose of this study was to determine the phosphorus budget as the basis for estimating potency of eutrophication in Situ Cilala. The results of this study showed that depth of Situ Cilala was relatively shallow, the surface area was 12 ha, the average depth was 1,88 m, and the maximum depth was 4,80 m with low relative depth (1,23%). Overall, P budget in Situ Cilala was 1345,2282 kg. The value of P budget was a joint between P budget come from sediment, sewage floating net cages, and inlet, was 11416,2891 kg and P budget that out from the system was 256,7873kg.
Keyword: Bogor Agricultural University (IPB), sources of total phosphate, Situ Cilala, utrient, P budget

Judul: Daya Tampung Beban Fosfor di Perairan Waduk Jatigede, Kabupaten Sumedang, Jawa Barat
Abstrak: Kegiatan pertanian dan pemukiman yang berada di sekitar waduk dapat menjadi sumber masukan fosfor, sehingga akan memengaruhi kualitas air waduk. Penelitian ini bertujuan menghitung daya tampung beban nutrien fosfor (P) berdasarkan lapisan kedalaman di perairan Waduk Jatigede. Pengambilan contoh air dilakukan setiap bulan dari bulan Februari hingga April 2021 pada inlet Waduk Jatigede dan perairan Waduk Jatigede. Seluruh stasiun pengamatan di perairan waduk terbagi menjadi lapisan epilimnion dan hipolimnion. Konsentrasi fosfor (total dan terlarut) tertinggi pada zona riverin di lapisan epilimnion. Terdapat 11 sungai yang masuk ke Waduk Jatigede, namun masukan beban fosfor yang utama adalah dari Sungai Cimanuk dan Sungai Cinambo. Daya tampung beban fosfor berdasarkan lapisan kedalaman di perairan Waduk Jatigede adalah 3285 kg tahun-1 untuk lapisan epilimnion dan 1593 kg tahun-1 untuk lapisan hipolimnion. Daya tampung beban fosfor untuk seluruh volume waduk adalah 4878 kg tahun-1., Agricultural and residential activities around the reservoir can be a source of phosphorus input, which will affect the water quality of the reservoir. This study aims to calculate the load capacity of phosphorus (P) based on the stratification of water in Jatigede Reservoir. Water samples were taken every month from February to April 2021 at rivers inlet and Jatigede Reservoir. All observation stations in the reservoir are divided into epilimnion and hypolimnion layers. The concentration of phosphorus (total and dissolved) were highest in the riverine zone at the epilimnion layer. There are 11 rivers that enter the Jatigede Reservoir, but the main phosphorus load input is from the Cimanuk River and Cinambo River. The load capacity of phosphorus in the Jatigede Reservoir are about 3285 kg year-1 for epilimnion layer and 1593 kg year-1 for hypolimnion layer. The load capacity of phosphorus for the entire volume of the reservoir is about 4878 kg year-1.
Keyword: Beban Fosfor, Lapisan Perairan, Waduk Jatigede

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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