Biomass of sweet corncob and birdlime that is much found in society is the garbage that until now have not widely used as a product that have value added. This research aims to use biomass of sweet corncob and the birdlime as an alternative fuel to substitute fossil energy sources. One alternative to make sweet corncob and birdlime as an alternative fuel is process them into charcoal briquettes so it can produces high calorific value. The process to make charcoal briquettes from corncob and birdlime is very easy which includes charcoal raw material drying, preparation of the adhesive, printing and drying the Briquettes. Besides, the testing of briquettes quality of sweet corncob includes: density (0.54 – 0.78 gr/cm3), calorific value (4936.454 cal/gr), water level (6.39%), ash level (3.8%), vaporized substance level (16.72%) and bonded carbon level (79.48%. Whereas, birdlime corncob include: density (0.61 – 1.3 gr /cm3), calorific value (6033.650 cal/gr), water level (6.83%), ash level (4.8%), vaporized substance level (18.41%) and bonded carbon level (76,48%).

The study aimed to explore the metacognitive activities of male students who were independent field cognitive style and field dependent cognitive style in solving problems. The type of this research is explorative with qualitative approach, that is from written works and in-depth interviews. Data analysis is done through data reduction, data presentation, data interpretation and conclusion drawing. The results showed that male students with field independent cognitive style, had a tendency to be structured, well organized in solving problems, could restructure new information and relate it to the knowledge they had. While male students with field dependent cognitive style, they had characteristics in solving problems are unstructured and not well organized. Also, they’re difficult to restructure new information and relate it to the knowledge they have.

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This study aims to explore the metacognitive skills of students with high mathematical abilities in the mathematics education study program at the Faculty of Teacher Training and Education in the University of Tadulako in solving contextual problems. The process of student metacognition is determined by providing a number of contextual problems that must be solved, then explored in stages by thinking aloud and unstructured interviews. It aims to explore students’ metacognitive skills in solving contextual problems. The results of data analysis show that students with high mathematical abilities in solving contextual problems involve their metacognitive skills.