Judul: Keseragaman suhu udara dan larutan nutrisi pada Berbagai Jarak Antar Nozzle untuk Aeroponic Chamber
Abstrak: Aeroponics is a method for growing plants in a spraying system of nutrient solution to plants roots in a mist fogging in a closed environment. There is no enough data concerning uniformity of nozzle spacings in order to get the best nutrient solution spraying, based on uniformity of some parameters such as pressure, velocity and air temperature. Those parameters can be simulated by using Computational Fluid Dynamics (CFD) software. The objective of this research is to determine the best spraying design of aeroponics system because the spraying will interacts with roots directly. Research steps were aeroponic system installation, air temperature measurement, spraying velocity and pressure measurement. Simulation has been done by using Computational Fluid Dynamics (CFD) for three nozzle spacings. The nozzle spacings were 30 cm, 40 cm and 50 cm. The results showed that optimum nozzle spacing was 40 cm (using three nozzles) and 50 cm (using two nozzles). Validation has been conducted for nozzle spacing of 40 cm. The regression equation for measured (x) and simulated (y) air temperature was y = 1.603x - 1.67, with a high coefficient of determination (R2 was 0.972). It has been shown that the predicted temperature of nutrient solution agreed well with that of the measured temperatures.
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Judul: Simulasi Sebaran Suhu pada Chamber Aeroponik dengan Menggunakan Computational Fluid Dynamics (CFD)
Abstrak: The most important part of aeroponic system is chamber for plant roots growing. Computational Fluid Dynamics (CFD) is a powerful software to analyze micro-environment on the aeroponic chamber. The objectives of this research were to study the changes in nutrient solution temperature on aeroponic system as impact the changes air temperature and solar radiation of greenhouse, to study heat transfer on aeroponic chamber as impact the changes chamber temperature, and to simulate of distribution temperature on various dimension of aeroponic chamber by using CFD. Results show that air temperature in the chamber was influenced by temperature of nutrient solution that sprayed out from nozzle and temperature of greenhouse that absorbed by the chamber material. Air temperature in the chamber were 21.32 °C to 35.62 °C. Every side of chamber have a different heat transfer depend on direct of solar radiation that transmitted in greenhouse. Heat transfer equations were solved by using the first thermodynamic’s law. CFD simulation has been conducted for air temperature in aeroponic chamber. Simulated chamber temperature were 24.1 °C at 08:00 while 34.4 °C at 13:00. Validation of the model had been done by using error presentage and linear regression analysis. It had been shown that the simulated temperature of aeroponic chamber agreed well with that of the measured temperatures.
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Judul: Analisis Straegi Pemasaran Ekspor Produk Tekstil Di Pt. Primissima
Abstrak: Indonesia yang sedang membangun di segala bidang memerlukan devisa yang besar untuk melaksanakan pembangunan tersebut. Pada awal-awal pembangunan pada masa pemerintahan Orde Baru perolehan devisa serta dari ekspor migas merupakan andalan untuk membiayai pembangunan. Namun dengan menurunnya harga minyak mentah dunia pada dekade delapan puluh, pemerintah mengambil kebijaksanaan untuk menggalakkan ekspor komoditas non-migas untuk menutup kekurangan devisa akibat penurunan harga minyak tersebut. Untuk maksud tersebut pemerintah mengeluarkan deregulasi di bidang ekonomi guna mempermudah arus barang dan merangsang dunia usaha untuk melaksanakan ekspor. Produk tekstil adalah salah satu komoditas ekspor Indonesia yang mengalami peningkatan volume ekspornya dalam beberapa tahun terakhir ini. PT. Primissima adalah salah satu produsen tekstil yang berdomisili di Medari, Sleman, Yogyakarta. Perusahaan didirikan pada tanggal 22 Juni 1971 merupakan joint venture antara Pemerintah dan Gabungan Koperasi Batik Indonesia (GKBI). Tujuan utama perusahaan pada saat didirikan adalah menjadi produsen tekstil untuk memenuhi permintaan bahan baku batik halus berupa Cambrics (mori) dan grey....
Keyword: komoditas non-migas, tategi pemasaran