Kualitas Arang Briket Berdasarkan Persentase Arang Batang Kelapa Sawit (Elaeis Guineensis Jacq) dan Arang Kayu Laban (Vitex Pubescens Vahl)

Energy is a major component in all human activities. The main source of energy for humans are natural resources derived from fossil carbon, these are petroleum, coal, and gas . The research aimed to determine the quality of charcoal briquettes based on ration percentage of charcoal oil palm trunks and charcoal Laban wood. This study used a completely randomized design. The percentage of oilpalm trunks charcoal (OTC) and Laban wood charcoal (LWC) as follow: 100% OTC; 20% OTC: 80% LWC; 40% OTC : 60%LWC; 60%OTC : 40% LWC ; 80% : 20% LWC; 100% LWC. Particle size of charcoal was 20 mesh adhesive tapioca flour. The charcoal briquettes size was 30-40 mm heigh with diameter 55 mm and made with hydraulic press with pressure 5 tons. Before testing the quality, charcoal briquettes was dried for 48 hours in oven with temperature 80oC. evaluation the quality of charcoal briquettes based on SNI 01-6235-2000. The average value of moisture content ash content, volatile matter content valve and carbon qualified the SNI 01-6235-2000 standard. The best value was achieved on charcoal briquettes with ratio percentage 40% oil palm trunks charcoal and 60% Laban wood charcoal with average calorific value 6377,67 cal/g. the charcoal briquettes produced can be used as an alternative energy for the society. Keywords: Bioenergy, charcoal briquettes, Laban, oil pal

Karakteristik Biopelet Berdasarkan Komposisi Serbuk Batang Kelapa Sawit dan Arang Kayu Laban dengan Jenis Perekat sebagai Bahan Bakar Alternatif Terbarukan

The research aims to evaluate the quality of biopellets made from different composition of the oilpalm trunk powder and Laban wood charcoal with different type of adhesive. The composition consist of 25% oilpalm powder : 75% Laban wood charcoal; 50% oilpalm powder: 50% Laban wood charcoal; 75% oilpalm powder : 25% Laban wood charcoal; 100% oilpalm powder respectively. The adhesives used are tapioca flour and sago flour. The research used completely factorial randomized design, which consists of eight combination treatment with 3 replications. The material was mixed manually and biopellets produced with meat mincer in home scale with size 2 cm long and diameter 0.4 cm. Biopelet then dry in oven for 24 hour with temperature 600C-700C. The quality of biopelet was evaluate according to SNI 8021 : 2014. The result of research showed that the average values of water content of biopellets was range between 6.91% - 9.98%; the average values of ash content was range between 1.02% - 1.69%; the average values of volatile matter content was range between 38.36% - 71.93%; the average values of fixed carbon content was range between 26.45% - 59.97% and the average values of calor was range between 3719,67(cal/g) 5944,33 (cal/g). The composition of oilpalm and Laban wood charcoal and type of adhesives was significantly affected the calor value of biopellets. Meanwhile the other values such as moisture content, ash content, volatile matter content and fixed carbon content was not significant. The quality of biopellets can fulfill the SNI 8021 : 2014 standard, except on ash content. The best biopellets was achieved on composition 25% oil palm trunk powder : 75% Laban wood charcoal with adhesive tapioca. Keywords : Biopellets, Laban wood, Oilpalm trunk, tapioca, sag

SK GKM Antar waktu a/n Roslinda R

SK GKM Antar waktu a/n Roslinda

High Sensitivity pH Sensor Based on Porous Silicon (PSi) Extended Gate Field-Effect Transistor

In this study, porous silicon (PSi) was prepared and tested as an extended gate field-effect transistor (EGFET) for pH sensing. The prepared PSi has pore sizes in the range of 500 to 750 nm with a depth of approximately 42 �m. The results of testing PSi for hydrogen ion sensing in different pH buffer solutions reveal that the PSi has a sensitivity value of 66 mV/pH that is considered a super Nernstian value. The sensor considers stability to be in the pH range of 2 to 12. The hysteresis values of the prepared PSi sensor were approximately 8.2 and 10.5 mV in the low and high pH loop, respectively. The result of this study reveals a promising application of PSi in the field for detecting hydrogen ions in different solutions

High Sensitivity pH Sensor Based on Porous Silicon (PSi) Extended Gate Field-Effect Transistor

In this study, porous silicon (PSi) was prepared and tested as an extended gate field-effect transistor (EGFET) for pH sensing. The prepared PSi has pore sizes in the range of 500 to 750 nm with a depth of approximately 42 µm. The results of testing PSi for hydrogen ion sensing in different pH buffer solutions reveal that the PSi has a sensitivity value of 66 mV/pH that is considered a super Nernstian value. The sensor considers stability to be in the pH range of 2 to 12. The hysteresis values of the prepared PSi sensor were approximately 8.2 and 10.5 mV in the low and high pH loop, respectively. The result of this study reveals a promising application of PSi in the field for detecting hydrogen ions in different solutions