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Abstrak :
Pengaruh permukaan hydrophobic pada aliran turbulen dalam pipa akan diteliti. Penelitian ini menggunakan air sebagai fluida serta tiga jenis daun talas, yaitu Colocasia gigantea, Colocasia esculenta, dan Colocasia fontanesii. Tiga pipa akrilik 7 × 7 mm, masing-masing dinding dalam pipa tersebut dilapisi dengan ketiga jenis daun talas tersebut. Drag reduction terbesar yang dihasilkan oleh dinding daun Colocasia gigantea yaitu sebesar 22,6% pada Re 7300 dengan ratarata DR sebesar 16,3%, sedangkan drag reduction terbesar yang dihasilkan dinding daun Colocasia esculenta dan dinding daun Colocasia fontanesii masingmasing sebesar 15,3% dan 20,5% pada Re 6400 dengan rata-rata DR masingmasing sebesar 12,6% dan 12,5%. ......The effect of hydrophobic surfaces on turbulent flow in a pipe were investigated. This study used water as the fluid and three types of leaves of taro, Colocasia gigantea, colocasia esculantea, and colocasia fontanesii. Three acrylic pipes were coated the three types of taro leaves. Reynolds number and characteristics of the pressure drop is the main variable to be studied. Rectangular pipes 7 x 7 mm those coated with the leaves showed a reduction in coefficient of friction. The biggest drag reduction produced by the leaf of Colocasia gigantea wall is equal to 22,6% at Re 7300 with an average DR 16.35%, while the largest drag reduction produced by Colocasia esculantea leaf and Colocasia fontanesii leaf are 15,3% and 20,5% at Re 6400 with average DR 12,6% and 12,5%.

Abstrak :
Penelititan ini bertujuan mengurangi pemborosan (waste) operasi loading di Terminal Petikemas KOJA dengan menggunakan strategi Lean. Lean merupakan suatu filosofi bisnis yang berlandaskan pada minimasi penggunaan sumber daya dalam berbagai aktivitas perusahaan, berfokus pada identifikasi dan eliminasi aktivitas-aktivitas yang tidak bernilai tambah. Penggunaan metode Waste Relationship Matrix (WRM), Waste Assessment Questionaire (WAQ), dan Value Stream Analysis Tools (VALSAT) bertujuan untuk mengidentifikasi serta menganalisa pemborosan yang terjadi.

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This study aims to reduce waste in loading operations at the Koja Container Terminal by using Lean strategy. Lean is a business philosophy that is based on minimizing resources usage in the various activities of the company, focusing on the identification and elimination on non value added activities. The use of Waste Relationship Matrix method (WRM), Waste Assessment Questionnaire (WAQ),and Value Stream Analysis Tools (VALSAT) are intended to identify and analyze the waste that occurred. Minimizing waste is usefull for a company in facing a harder era of business competition.