Judul: Prototype Seaweed Washing Machines Based on Hybrid Technology
Abstrak: Seaweed has a high economic value in terms of its considerable use in various industries of sweets, cosmetics, ice cream, flavourings, bakery, sauce, silk, meat/fishery canning, medicine and iron-rod welding. In 2005,Indonesia has declared that seaweed as one of the leading commodities to be prioritized and revitalized. To produce quality of industrial-scale seaweed has necessary a serious handling, start from harvesting process, uploading, washing, drying, up to manufacturing caraggenan.This study has tried to produce a seaweed washing machine that capable to improve the quality of the seaweed in the washing process. This washing machine is based on hybrid technology that can be operated using energy from pedal-powered and electrical-powered generated from solar panels.The washing machine resemble three-wheeled transport vehicle using pedal-powered for mobility. Activity of seaweed washing process using plastic drum that rotated. There are two different size of plastic drum used in washing machine, the bigger size for static water storage containers and the little one for dynamic (rotation) using pedal-powered or electrical motor.The rolled chain transmission that connected with integrated toothed gear is used to ratate a dynamic drum. The different between pedal-powered and electrical-motor powered lies in process to rotated dynamic drum. Pedal-powered use manpower to rotated dynamic drum but electrical motor powered from electrical that generated from solar panel. Washing machine with pedal-powered similar like pedal powered that contained in bicycle. Solar panel systems which is the source energy for generated electrical motor consists of solar panel itself, controller, battery and DC to AC converter. Overall the machine has works well butt need improvement in terms of manueverability
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Judul: Rancang Bangun Mesin Penyiang Padi dengan Sistem Kendali Jarak Jauh menggunakan Remote Control
Abstrak: Padi merupakan tanaman penting penghasil beras yang akan dijadikan nasi sebagai makanan pokok sehari-hari di Indonesia. Namun produksi padi menurun yang salah satunya diakibatkan oleh gulma. Penelitian bertujuan untuk merancang bangun mesin penyiang yang dapat mengatasi gulma lebih efektif dan efisien dibandingkan cara manual atau menggunakan alat konvensional. Penelitian diawali dengan identifikasi dan perumusan masalah, perumusan dan evaluasi konsep desain, analisis rancangan, manufaktur atau prototyping, serta diakhiri pengujian kinerja hasil rancangan. Mesin penyiang yang dibangun menerapkan 2 buah roda sirip sebagai penggerak, 6 buah pisau rotari sebagai implemen pemotong, motor dc 430 Watt sebagai sumber penggerak, baterai Lipo 3000 mAH sebagai sumber tenaga, dan kopling cakar sebagai sistem belok. Hasil pengujian menunjukkan mesin mampu menempuh kecepatan rata-rata sebesar 8,25 x 10-2 m/s, menghasilkan kapasitas lapang teoritis sebesar 74,21 m2/jam dan efektivitas sebesar 65,52%. Nilai tersebut sudah berada diatas gasrok, namun masih dibawah ski rotary weeder dan power weeder., Paddy is an important rice-producing crop that will be used as rice as a daily staple food in Indonesia. However, rice production has decreased, one of causes is caused by weeds. The research aims to design a weeding machine that can deal with weeds more effectively and efficiently than the manual method or using conventional tools. The research begins with identification and formulation of problems, formulation and evaluation of design concepts, design analysis, manufacturing or prototyping, and ends with testing the performance of the design results. The weeding machine that is built applies 2 fin wheels as a drive, 6 rotary blades as a cutter implement, a 430 Watt dc motor as a driving source, a 3000 mAH Lipo battery as a power source, and a claw clutch as a turning system. The test results show the machine is able to travel an average speed of 8,25 x 10-2 m/s, resulting a theoretical field capacity 74,21 m2/hour and effectiveness is 65,52%. These values are above the gasrok, but still under rotary weeder and power weeder.
Keyword: paddy, paddy weed, weeding machine, design, testing

Judul: Approximation of the Median of Poisson Distribution Using the Relation of Poisson-Gamma Distribution
Abstrak: A major drawback of median is that median cannot usually be defined in closed form, even in the cases where their distribution functions are known. This study gives an approximation of the closed form for the median of the Poisson distribution by using the relation of Poisson-Gamma distribution. The approximation uses elementary techniques based on the monotonicity of certain sequences involving tail probabilities of the Poisson distribution and the Central Limit Theorem. Furthermore, a closed form expression for the mean absolute deviation 􀜧|􀜰􀰒 􀵆 􀜯􀝁􀝀􁈺􀜰􀰒􁈻| is also studied. The median is relevant because of the fact that it minimizes the mean absolute deviation of a Poisson random variable (􀜰􀰒􁈻 by considering median as central tendency.
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