Judul: Perikanan bubu dan peluang pengembangannya di sekitar lokasi sea farming Kepulauan Seribu
Abstrak: Program sea farming yang dilaksanakan oleh Pemerintah Kabupaten Administratif Kepulauan Seribu bekerja sama dengan Pusat Kajian Sumberdaya Pesisir dan Lautan (PKSPL) IPB bertujuan untuk meningkatkan stok ikan (restocking) dan membantu meningkatkan pendapatan nelayan tradisional terutama nelayan bubu dan pancing.
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Judul: Efektivitas dan Strategi Pengembangan Sea Farming di Kabupaten Kepulauan Seribu
Abstrak: Program sea farming di Kepulauan Seribu pada awalnya merupakan kegiatan yang diharapkan dapat menjadi alternatif pencarian bagi masyarakat di Kepulauan Seribu. Dasar pemikiran yang mendasar mengapa diperlukannya alternatif pencarian bagi masyarakat di karenakan mata pencarian utama masyarakat adalah sebagai nelayan tangkap dimana sangat tergantung pada sumberdaya laut yang ada disekitar kepulauan seribu. Ketergantungan masyarakat terhadap sumberdaya alam terutama hasil laut yang begitu besar menjadikan hasil laut sebagai penopang kehidupan meraka. Di sisi lain sumberdaya laut semangkin lama akan berkurang atau terjadi dekradasi. Dekaradasi yang terjadi disebabkan diantaranya adalah faktor menurunya kualitas air laut yang di sebabkan pencemaran limbah baik dari manusia maupun pabrik. Penyebab lain adalah kurang bertanggung jawabnya para nelayan dalam melakukan penagkapan ikan, penggunaan alat tangkap dan bahan kima yang berbahaya mengakibatkan kerusakan laut yang berdampak pada penurunan hasil laut.
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Judul: Effects of Particle Shapes on Temperature Distribution under Static Ohmic Heating.
Abstrak: The ohmic heating is defined as a process wherein an alternating electrical current is passed through materials resulting in the heat generation inside the product. The excellence of ohmic heating in comparison with other thermal processing is its energy efficiency and ohmic heating could keeping nutritional as well quality attribute of food via blanching, sterilization, pasteurization, extraction, fermentation, and evaporation. Nevertheless, in ohmic heating process, the electrical conductivity of product is a key parameter. The worst case in the ohmic heating of multiphase product could be occurred when the solid phase has very lower or very high electrical conductivity than the liquid. This study aims to reveal the temperature distribution and the heating rate properties of solid and liquid phase as affected by particle shape and its orientation to the electric field. Experiments were conducted with salt solution 1% and carrot that blanched in salt solution 6%. Blanching process was conducted in order to increase the electrical conductivity of carrot close to the salt solution 1%. Ohmic heating was applied to the sample using static cell (4.90 cm diameter and 6.00 cm in length of sample area) at constant voltage gradient (40 V). Each experiment was conducted in triplicate. It was observed that the different particle shape and orientation provide the different heating rate properties. The slice particle had the fastest heating rate. Moreover the perpendicular orientation was heated faster than parallel orientation. The parallel cylindrical shape provides the slowest heating rate. This shape possibly induced the worst-case condition and could be used as sufficiency heat parameter. The heating pattern of each solid and liquid were simulated using COMSOL modeling software. The predicted temperature values were in good agreement with the experimental data with the maximum prediction error of 3 °C.
Keyword: particle orientation, particle shape, electrical conductivity, ohmic heating