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: Analisis Nilai Land Rent dan Optimalisasi Pemanfaatan Lahan Tambak Bandeng di Kelurahan Marunda, Jakarta Utara
Abstrak: The purposes of this research were to identified the production of bandeng fishpond activity, estimates the land rent value based from water source, and optimization activity from bandeng fishpond in Kelurahan Marunda. The method used this research were descriptive analysis, land rent value analysis, optimization analysis and sensitivity analysis. The result shows that the input of fishpond bandeng production in every unit is the land, seed, labor, manure, pest control, vitamin, feed, and water use. The land rent value of the fishpond bandeng at BKT water user is Rp 2.093.961,52 per ha. While land rent value at sea water user is Rp 1.039.702,06 per ha. The analysis informs that the unit of analysis of BKT water user has a surplus of land larger than the unit of analysis of sea water users. This illustrates that land use activities from milkfish ponds in the unit of analysis of BKT water users is more efficient aspects of selling power output and fertility of the land. In addition, this study also analyzed the optimization of production inputs to construct the objective function to maximize the value of rents. This is to determine the efficient level of milkfish ponds at Marunda in economically. Optimization and sensitivity analysis results indicate that the use of optimal inputs and rising prices give a positive land value, so that the activity is feasible
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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