Judul: Simulasi distribusi suhu dan kelembapan udara untuk pengembangan desain rumah tanaman di daerah tropika basah
Abstrak: Greenhouse design for the humid tropical regions is still a challenge. Microclimate analysis of a standard peak type greenhouse has been conducted using Computational Fluid Dynamics (CFD). The objectives of this research were to simulate temperature, humidity, and airflow distribution by using CFD, and to investigate the greenhouse natural ventilation performance on zero and low windspeed conditions. Climate data and greenhouse characteristics were used as inputs for the simulation. The CFD model predicted temperature, relative humidity, and airflow distributions inside the greenhouse. Visual representations of the three parameters distributions in the greenhouse were created by isothermal line. The simulation produced realistic approximations of the dynamic behavior of greenhouse environments. Results of this study showed the importance of roof vents and sidewalls openings for efficient thermally driven ventilation
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Judul: Simulasi distribusi suhu dan pola aliran udara dalam rumah tanaman tipe modified arch menggunakan computational fluid dynamics
Abstrak: In this research, the effect of wind speed on the natural ventilation of a modified arch greenhouse was analysed by computational fluid dynamics (CFD), using the commercial software SolidWorks of 2010. The objectives of this research were to understand the natural ventilation on the greenhouse and develop a simulation of temperature distribution and the airflow pattern on the modified arch greenhouse. The experiment was carried out in a modified arch greenhouse equipped with both top and side ventilations. Climate data and greenhouse characteristics were used as inputs and boundary condition to develop a simulation model. Two-dimensional simulation in a steady state with the condition of no wind speed (0.0 m/s), moderate wind speed (0.5 and 0.6 m/s) and high wind speed (1.8 m/s) were carried out. The wind speed through the insect-proof screen was simulated as a flow through porous media. The CFD model has succeded in predicting the temperature distribution and airflow pattern of the greenhouse. The result of the model showed that the greenhouse has a gradient temperature vertically and the natural ventilation works effectively. It is proved that a small error percentage of difference temperatures between the simulation result and the observed data (less than 8%) was obtained. The coefficient variation was also small (0.12), with the coefficient of uniformity of 89.76%.
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Judul: Karakterisasi Protein Bisa Ular Kobra Jawa (Naja Sputatrix) Setelah Perlakuan Penjemuran Dan Fotooksidasi
Abstrak: Bisa ular telah diketahui memiliki toksisitas yang menyebabkan kematian sekaligus merupakan sumber hayati yang penting sebagai obat untuk penyembuhan penyakit. Beberapa perlakuan dapat diberikan untuk menghilangkan toksisitas dalam bisa ular. Penelitian mengenai perlakuan penjemuran dan fotooksidasi untuk menurunkan efek toksik bisa ular Naja sputatrix belum dilakukan. Tujuan dari penelitian ini yaitu mengkarakterisasi kandungan protein dan aktivitas toksik pada bisa ular N. sputatrix setelah diberi perlakuan penjemuran dan fotooksidasi. Kadar protein pada bisa ular N. sputatrix yaitu 20.46% (b/v) yang meningkat setelah proses penjemuran, dan menurun setelah proses fotooksidasi. Bisa ular dipisahkan menjadi 5 pita protein utama dengan bobot molekul 14 hingga 108 kDa. Penjemuran selama 6 jam memiliki efek yang sama dengan perlakuan fotooksidasi yaitu menurunkan aktivitas LAAO sebesar 91% dan menghilangkan aktivitas antikoagulasi pada bisa ular, namun kedua perlakuan tersebut memiliki efek yang berbeda pada enzim PLA2 bisa ular. Penjemuran tersebut menurunkan 96% aktivitas PLA2 sedangkan fotooksidasi menghilangkan hampir seluruh aktivitas enzim tersebut (99.8%). Hasil ini menandakan bahwa penjemuran dan fotooksidasi dapat menurunkan aktivitas toksik dari bisa ular, namun tidak mempengaruhi karakter fisik dari kandungan proteinnya.
Keyword: asam L-amino oksidase, fotooksidasi, Naja sputatrix, bisa, fosfolipase A2