Judul: Evaluasi kebijakan pengambilan dan pemanfaatan air tanah di Provinsi DKI Jakarta
Abstrak: The formulation and implementation policies have been the key factors in preventing the occurrence of groundwater depletion. Groundwater exploitation and utilization in Jakarta have been predicted to cause the decline of groundwater level, land subsidence and salt water intrusion. The policy established by the local government of DKI to handle these conditions is to establish the increase of groundwater tax. The study aimed to collect the policies regarding the groundwater use, to evaluate the impact of the increase of groundwater tax, and to compare between the costs of groundwater exploitation and utilization and the tariff of piped water supplied by PAM DKI Jakarta.
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Judul: Analisis Kebijakan Pengelolaan dan Pemanfaatan Air Tanah di Kecamatan Cidahu Kabupaten Sukabumi
Abstrak: Cidahu District is one buffer zones of Mount Salak Forest which has quite large groundwater potential. Groundwater of Cidahu District has become the source for commercial and non comercial uses, such as to fulfill the needs of fresh water for companies and local society. Continuous utilization in large quantity will potentially cause damage to the environment, for example decrease in quantity and quality of groundwater that can be used by the society. Decrease in the quantity of groundwater is indicated have causing the economic losses to society. Therefore, groundwater management policy base on synergy among stakeholders becomes very important in order to regulate the use of groundwater to be equitable and sustainable. The estimation result by using replacement cost approach demonstrates the potential economic losses experienced by the local community of Cidahu District due to the quantity of groundwater, reached Rp. 696.756.900 per year. The result of stakeholders mapping shows that Department of Mines, Energies, and Mineral Resources of Sukabumi Regency held the most important role in managing groundwater utilization in Cidahu District. Based on the results of policy analysis, taxes and licensing policy instruments have not used optimally in order to control groundwater utilization by the companies
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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