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: 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: Perumusan Strategi Bisnis Pt.Karana Line
Abstrak: PT. Karana Line adalah sebuah perusahaan pelayaran yang memberikan layanan jasa transportasi laut. Perusahaan ini didirikan pada tanggal 25 April 1967 di Jakarta. Pada bulan Mei 1999 jumlah tenaga kerja mencapai 329 orang. PT.Karana Line merupakan salah satu anggota Indonesian National Shipowner Association (INSA) dan Indonesian National Line (INL) yang cukup dikenal di Indonesia. Pada tanggal 21 November 1988 pemerintah mengeluarkan kebijakan yang dikenal dengan Paket Kebijaksanaan November (PAKNOV) 21/1988 dimana dengan adanya kebijakan ini banyak bermunculan perusahaan pelayaran yang tidak memiliki kapal sendiri. Padahal kepemilikan kapal merupakan salah satu persyaratan pendirian perusahaan pelayaran yang cukup berat sebelum adanya PAKNOV 21/1988. Meskipun perusahaan- perusahaan pelayaran tersebut tidak memiliki kapal sendiri, namun dapat mengoperasikan dan mengageni kapal nasional maupun asing, sehingga terjadi persaingan ketat dalam bidang angkutan laut di Indonesia. Krisis ekonomi dan politik yang melanda Indonesia menjelang era pasar bebas telah mendorong PT Karana Line untuk menerapkan strategi yang sesuai dengan kondisi internal maupun eksternal perusahaan. Untuk itu perlu ditelaah 1). Faktor faktor apa saja yang mempengaruhi perkembangan - usaha PT.Karana Line, 2). Strategi apa yang akan digunakan untuk keberhasilan pengembangan usaha PT. Karana Line, 3). Program apa yang perlu dilakukan untuk mewujudkan strategi dalam mengembangkan usaha PT.Karana line, 4). Sistem pelayanan mana yang perlu dioptimalkan, sehingga memberikan keuntungan maksimal....dst
Keyword: strategi bisnis