Judul: Produksi dan Laju Dekomposisi Serasah Mangrove Jenis Avicennia marina (Api-Api
Abstrak: Luas hutan mangrove di Indonesia mencapai 4,25 juta ha dan tersusun oleh lebih dari 60 jenis dan 20 suku mangrove . Saat ini kondisi hutan mangrove di beberapa tempat di Indonesia sedang mengalami kerusakan akibzt adanya tekanan lingkungan dan kurangnya informasi serta kesadaran masyarakat. Selain itu, informasi yang berkaitan dengan sumberclaya mangrove masih sedikit sehingga belum dapat mendukung penataan ruang, pembinaan, pemanfaatan yang lestari, perlindungan dan rehabilitasi. Salahsatu Komponen yang bermanfaat bagi pelestarian dan pengembagan kawasan hutan mangrove adalah serasah mangrove dari jenis Avicennia marina.
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Judul: Laju Dekomposisi Serasah Daun Avicennia marina pada Berbagai Tingkat Salinitas (Studi Kasus di Kawasan Hutan Mangrove Blanakan RPH Tegal Tangkil, BKPH Ciasem-Pamanukan, KPH Purwakarta, Perum Perhutani Unit III Jawa Barat)
Abstrak: Hutan mangrove adalah hutan tropika yang berada di wilayah pesisir lautan, yang terhindar dari ombak dan selalu tergenang scrta masih mengalami pasang surut air laut. Hutan mangrove mempunyai fungsi ganda, ditinjau dari aspek sosial, ekonomi dan ekologi. Mengingat fungsi dan peranan hutan ini mangrove dalam mendukung kehidupan sangat tinggi mnka mangrove harus dikelola dari dimanfaatkan bcrdasarkan prinsip-prinsip kelestarian hasil dan kclcstarian ckologisnya.
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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