Judul: Analisis Efektivitas Waduk Ciawi Menggunakan Model SWAT Sebagai Upaya Pengendalian Banjir DAS Ciliwung
Abstrak: Management of the upstream watershed was significant factor because it had a role as the water catchment area to decrease the surface flow and potential flood. Ciliwung watershed had been gaining attention because the Indonesia central government, which is Jakarta, was located in the downstream of that watershed frequently flooded. The Ciawi Reservoir construction program on the upstream watershed was expected could help to recover that issue. The aim of this research was to analyse the effectiveness of Ciawi Reservoir by hydrology response that obtained by apply the SWAT model. The scenario of reservoir modelling was made on the hydrology simulation that had been formed, so the alteration of hydrology response that happened before and after the reservoir model applied could be known. There were 28 subbasins and 516 HRUs with 9 types of landuse, 3 soil types, and 5 slope classes on Sub Ciliwung Hulu watershed. The reservoir modelling with 15 scenarios indicated the alteration of flow discharge that specifically observed on outlet point 1 (Katulampa). The highest total discharge derivation was 158.626 m3 s-1 (34%), while the highest peak discharge derivation was 27.07 m3 s-1 (47.79%), and the best KRS value was 28.326 with good category. Based on the obtained result, the scenario of reservoir modelling managed to minimize the flow rate, so it could be said that the construction of Ciawi Reservoir was considered effective enough.
Keyword: Bogor Agricultural University, SWAT, flow out, flood, Ciliwung Hulu Watershed, Ciawi Reservoir

Judul: Analisis Hidrologi di Sub DAS Ciliwung Hulu Menggunakan Model SWAT
Abstrak: The Ciliwung Watershed is one of the area which has a critical condition. It caused by residential increased in upper area. This condition change of hydrologic characteristics such as run off increased and flood risk. It means Ciliwung Watershed management must be improve. SWAT model can applied for watershed management scenario, such as predict run off and water balance. Model validation used daily data from 2001 to 2010 resulted the NSE 0.53 and R2 0.57, it means SWAT model is satisfy to predict hydrological conditions of the Upper Ciliwung Watershed. SWAT model shows by input annual rainfall 3 790.12 mm results run off 38.45% (1 457.38 mm/year), evapotranspiration 22.06% (836.04 mm/year), lateral flow 20.31% (769.92 mm/year), percolation 15.28% (579.02 mm/year), and ground water 3.90% (147.77 mm/year). Applied recharging well scenario at settlement area with the infiltration function similar with forest predict can reduce run off 46.17% (672.93 mm/year).
Keyword: Upper Ciliwung, SWAT model, run off, hydrologic characteristics

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