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Polyetheretherketone (P.EEK) has been used as a bone implant because it has the nature of a biocompatible, strong, non-corrosive, stable and not affected by high temperatures. PEEK is potential for use as an implant material. Applications in maxillofacial reconstruction surgery is very beneficial in terms of time and cost. Modelmaking mandible obtained from data on patients affected by tumor ameloblstoma. The data have been taken by a CT-scan in the form of DICOM (Digital Imaging and Communication in Medicine) is amended by Catya into STL files (stereolithography). STL file is then printed with 3D-printers and Computer Numerical Control (CNC) machines.Printouts based models have been created for the reconstruction implants in maxillofacial surgery.

Keywords: Polyetheretherketone; implants; reconstructive surgery; maxillofacial; mandible.

Time decay in fruits and vegetables can be controlled by the addition or subtraction of O2 and CO2 gas that can be set to obtain various gas compositions. Meal preservation technology as modified atmosphere storage (MAS) is a system of controlling the air flow rate to lower levels of O2 by injecting CO2 to restrain the rate of decay in fruits and vegetables. This study uses two stages, namely simulation and experimental stage. Simulation is done using ANSYS software and experimental uses of the relationship between the flow pattern and the time decay. The flow patterns are represented by the parameters of the turbulent kinetic energy. Time decay is represented by the color and glucose levels. The purpose of this study is the simulation of the flow pattern in the MAS, the relationship to the number and position sparger flow patterns and the relationship between the oxygen content of fruit decay with time. Outcome of this study is a model of the relationship between the levels of O2 by the time decay of the fruit by making 5 variants sparger on the number and position of MAS. Decreased levels of oxygen are done by injecting CO2 for 24 hours and wait for 2 days. The experimental results show that the oxygen levels in MAS 3 variant can reduce levels of the lowest O2 to 8.5% and glucose levels in the banana inside MAS 5.33%, while bananas outside MAS 9.65%.

Keywords: Modified Atmosphere Storage, flow patterns, the time decay of the fruit, sparger

Kebutuhan akan energi listrik di Indonesia saat ini sebesar 55.000 MW, sementara energi listrik yang mampu disuplai oleh pemerintah sebesar 32.000 MW dan sisanya disuplai oleh perusahaan swasta. Pemenuhan kebutuhan energi listrik oleh pemerintah tersebut masih banyak mengalami kendala, maka dibutuhkan sumber energi listrik baru yang ramah lingkungan. Proses perancangan sepeda statis penghasil energi listrik yang ergonomis menggunakan kombinasi metode perancangan, yaitu: Quality Function Deployment (QFD) dan Pahl and Beitz. Hal terpenting dari metode QFD adalah matriks House of Quality (HoQ) yang merupakan konversi dari kebutuhan pelanggan secara langsung terhadap spesifikasi teknis produk yang akan dihasilkan. Sepeda statis penghasil energi listrik merupakan salah satu cara dalam menghasilkan sumber energi listrik baru yang ramah lingkungan. Energi listrik yang dihasilkan oleh sepeda statis ini disimpan ke dalam aki kering yang dimanfaatkan kemudian sebagai energi listrik untuk penerangan rumah. Berdasarkan hasil HoQ dan seleksi konsep diperoleh dimensi rancangan sepeda dengan panjang 1632,6 mm, lebar 569,5 mm dan tinggi 1315 mm. Sedangkan hasil perhitungan energi yang dilakukan, bahwa energi listrik yang tersimpan dalam aki kering dengan kapasitas 120 Ah digunakan untuk penerangan rumah selama ±10 jam dengan syarat penggunaan tiga buah lampu LED 7 Watt dan dua buah lampu LED 5 Watt.

Kata kunci: energi listrik, energi mekanik, ergonomis, sepeda statis.