Judul: Analisis dampak ekonomi daerah tambak terhadap kesejahteraan ekonomi petani tambak dan masyarakat Kelurahan Marunda Kecamatan Cilincing Jakarta Utara
Abstrak: Cultivation activity at fishpond area caused both direct and indirect impact to the society around, such as economic impact from the fishpond itself. The aims of this research were (1) Identificated fishpond trading characteristic, trading unit, and local labor around its area; (2) recited the fishpond farmer wealth from crop producer surplus value; (3) analyzed economic impact that brought by milkfish and tiger prawn cultivation activity; (4) proposed the research recommendation results to increased fishpond farmer wealth and local society nearby the area. The methods in this research were descriptive analysis, producer surplus and multiplier. Research results found out that fishpond policulture income was higher than Province Minimum Salary decreed by DKI Jakarta which is IDR 2.441.000. Policulture fishpond farmer in Marunda gained the income amount was IDR 2.944.586 every month, with the producer surplus maximum profit were IDR 103.085.133.600 at the production point 80.569.348 kg, and average production results in the field were IDR 23.649.565 at production point 2.199 kg every hectare per year. Monoculture milkfish fishpond farmer income IDR 1.153.958 every month, with the producer surplus maximum profit amount was IDR 3.794.952 at production point 455 kg, and production average in the field was IDR 1.382.692 with production average 832 kg. Monoculture tiger prawn fishpond farmer gained income amount was IDR 2.348.571 every month, producer surplus maximum profit was IDR 18.396.396 at the production point 732 kg, and production average result in the field was IDR 15.935.370 with production average amount 428 kg. Multiplier analysis result showed that Keynesian Income Multiplier was 0,75. Ratio Income Multiplier Type I was 1,05 and Ratio Income Multiplier Type II was 1,10. Policulture fishpond cultivation profit was higher than monoculture technique and its amount was higher than DKI Jakarta Province minimum salary. Fishpond farmer gained surplus from cultivation activity, but still not got the maximum result so it was needed to increased production cost, intensive technology used, or expanded land area.
Keyword: Bogor Agricultural University (IPB), Marunda Village., fishpond farmer, economic welfare, cultivation area, economic impact

Judul: Valuasi Ekonomi Dampak Budidaya Ikan di Tambak dengan Alih Fungsi Lahan Mangrove di Desa Tambaksumur, Kecamatan Tirtajaya, Karawang
Abstrak: Profitable business of brackishwater black tiger shrimp and milkfish pond culture in Karawang Regency have triggered the excessively convertion of mangrove forest areas into brackishwater pond areas. This convertion result in negative impacts on the household incomes and the environment since mangrove forest has a strategic role for life such as a source of human needs, shelter, spawning and food source for marine life, as well as protection from coastal erosion. A study to identify the benefits of direct use values of mangroves and economic losses, analyze the benefits financially, sustainability pond analyzes, and identify policy implications of the impact of tiger shrimp and milkfish with conversion of mangrove land was conducted in Karawang Regency. Tambak Sumur was selected as a study site since this village has mangrove forest areas converted into brackishwater black tiger shrimp and milkfish as a study site since this village ponds. Parameter observed were the feasibility of mangrove forest convertion into brackishwater black tiger shrimp and milkfish ponds such as replacement cost and economic valuation. Data were analyzed descriptively. The result of this study revealed that mangrove forest had important role for communities income and the environment. Conversion of mangrove forests into brackishwater black tiger shrimp and milkfish ponds financially was still feasible indicated by R/C of 1,12.
Keyword: Replacement Cost, Mangrove Forest Convertion, Economic Valuation, Milkfish Pond Culture, Black Tiger

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