Judul: Simulasi Sebaran Suhu Udara dan Permukaan Lantai Rumah Tanaman dengan Menggunakan Computational Fluid Dynamics (Cfd)
Abstrak: Temperature is one of important factors in plant growing. Distribution of temperature that occurs in the greenhouse should be used as the basic consideration for designing a greenhouse. Floor is one of important governing factors that affect temperature distribution. The air and surface temperature distribution on the floor greenhouse can be simulated by using Computational Fluid Dynamics (CFD). The simulation was applied to a naturally ventilated standard peak greenhouse. Measured floor surface temperature were 26.3–47.7 oC and air temperature at 45 cm above the floor surface were 23.5–39.2 oC. Simulated floor surface temperature were 26.41–39.89 oC and air temperature at 45 cm above the floor surface were 25.43–36.40 oC. Validation of the model had been done by calculating accuration and linear regression analysis. The simulation showed the accuracy 91.18-99.66% at the minimum solar radiation (0 W/m2) and 90.79-99.92% at maximum solar radiation (1,092 W/m2), and resulting a high value of coefficient of determination (0.946-0.947). Results show that the model performed well in simulating the air and surface temperature distribution on the floor of greenhouse, as compared to that of the measured value. It also show that CFD could be used to predict convective heat transfer and airflow pattern on the floor of greenhouse, accurately.
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Judul: Flow type and temperature distribution analysis at standard peak greenhouse using Computational Fluid Dynamics (CFD)
Abstrak: This experiment was analyzed of air flow and temperature distribution in standard peak greenhouse using computational fluid dynamics (CFD) as a basic consideration for air movement design. The method is using three models of greenhouse which modified condition of being slant roof to be 30o and 45o. The dimensions of greenhouse existing were: 12 m in length, 6 m in width, and 5,14 m in height. The floor was made from concrete. Polycarbonate was used as roof of the greenhouse and the wall was use screen as natural ventilation with 1,5 mm2. The results of the analysis showed that during the daytime, air temperature inside greenhouse surrounding the roof increased by the condition of being slant roof is steep. The CFD simulation showed clearly the air flow and temperature distribution in greenhouse. This cause showed the average of error at 00:00 o’clock is 1,44%, at 07:00 o’clock is 1,83%, at 12:00 o’clock is 2,34%, and at 17:00 o’clock is 1,49%. Therefore, it can be used as basic consideration for the modified of slant roof design with respect to low air temperature and uniform air temperature distribution. It was recommended that one of the optimal condition of being slant roof is 30o.
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Judul: Metazoan parasites from the narrow-barred Spanish mackerel, Scomberomorus commerson (Lacepede, 1800) around Sulawesi waters
Abstrak: Ikan tenggiri adalah salah satu ikan ekonomis penting yang dijual untuk memenuhi pasaran lokal dan salah satu komoditi ekspor. Untuk menjaga kualitas ikan tersebut, maka perlu dik etahui tentang stok dan parasitnya. Studi parasit merupakan salah satu informasi penting dalam bidang ekologi seperti peranan parasit pada suatu ekosistem dan informasi dasar bagi industri perikanan dalam menjaga kualitas ikan, dan dalam bidang manajemen, kemungkinan dapat juga digunakan sebagai indikator stok populasi ikan.
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