Judul: Aplikasi Salvinia molesta dan Pistia stratiotes sebagai Agen Bioremediasi untuk Memperbaiki Kualitas Perairan Danau Ebony Jakarta Utara
Abstrak: The Polder System of Ebony Lake receive water from household drainase and run-off input, Ebony Lake has high turbidity and bad odor, it indicated the occurrence of organic matter pollution. The purpose of this study was to examine changes in water of Ebony Lake through bioremediation procces by Salvinia molesta and Pistia stratiotes. The main parameters were COD, ammonia, nitrite, nitrate, sulfide, orthophosphate, and turbidity. Based on the results of the study, it was found that a decline in the value of COD, ammonia, nitrite, nitrate, orthophosphate, sulfide, and turbidity. However, the decrease was not different in the control treatment. This is presumably due to other factors, namely bacteria or microorganisms that decompose organic matter. Decomposition results in the form of inorganic nutrients and water used by plant for growth. This is evident from the increased extent of the closure and the water plant biomass.
Keyword: Salvinia molesta, Pistia stratiotes, water quality, organic material, bioremediation

Judul: Aplikasi Tanaman Air Tenggelam sebagai Bioremediator Limbah Organik
Abstrak: The increase of population will directly increase the amount of waste organic material produced which can result in water pollution. Water pollution problems also occur in the Ebony Lake because of the input of waste organic matter which lead to a decrease in water quality of the lake. This research aimed to measure the change of organic matter concentration of Ebony Lake water after using bioremediator Cabomba caroliniana and Hydrilla verticillata. The research was conducted using “In Time-Completely Randomized Design”. Samples were performed at three treatments with three replications, those were observed every three days for 18 days. The results showed that changes in the concentration of organic matter occurs during the 18 days of observation as seen from the decrease in the percentage COD value in the control treatment, Cabomba caroliniana, and Hydrilla verticillata respectively 100%, 98%, and 96%.
Keyword: Bogor Agricultural University (IPB), aquatic plant, water quality, Pollution

Judul: Transisi Fasa Materi Hadronik ke Materi Kuark pada Inti Bintang Neutron.
Abstrak: Bintang neutron terdiri dari beberapa lapisan yang disusun oleh materi nuklir yang berbeda dengan kerapatan yang semakin tinggi ketika mendekati pusat bintang. Inti luar bintang neutron disusun oleh materi hadronik (nukleon, lepton, dan hyperon), sedangkan inti dalam bintang neutron disusun oleh kuark-kuark bebas (up, down, strange) yang saling berinteraksi. Tujuan penelitian ini adalah mempelajari bagaimana transisi dari inti luar ke inti dalam bintang neutron dengan menggunakan pendekatan RMF (Relativistic Mean Field) untuk materi hadronik dan CIDDM (Confined Isospin Density Dependent Mass) untuk materi kuark. Tekanan transisi diperoleh ketika potensial kimia barion materi hadronik dan materi kuark bernilai sama. Nilai tekanan transisi dengan parameter SU6-TM1 sekitar 87 MeV/fm3 dan diperoleh massa maksimum bintang neutron yaitu 1.92M dengan jari-jari sekitar 8.62 km. Nilai tekanan transisi dengan parameter SU6-G2 sekitar 53 MeV/fm3 dan massa maksimum bintang neutron yaitu 1.88M dengan jari-jari sekitar 8.16 km. Jenis transisi fasa adalah orde satu ditandai dengan diskontinuitas dalam kerapatan energi (adanya mixed phase). Parameter-parameter pada model nuklir yang digunakan menyebabkan perbedaan kekakuan persamaan keadaan (EOS) dari materi hadronik dan materi kuark sehingga nilai tekanan transisi dari fasa hadronik ke fasa kuark juga berbeda.
Keyword: bintang neutron, persamaan keadaan, transisi fasa