Rita Manulang - Academia.edu (original) (raw)
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Papers by Rita Manulang
The purpose of this research is exploratory research by applying Lesson Study, which consists of ... more The purpose of this research is exploratory research by applying Lesson Study, which consists of three stages: planning (Plan), implementation (Do), Objectives, and reflection (See). Subjects in this study are prospective teachers Teachers Faculty of Teacher Training and Education Dehasen University in Statistics courses amounting to 31 people. Data collection was done using observation sheets, test sheets, and documentation. The data were obtained from the observation sheet in the lesson study activity and the test sheets were analyzed descriptively. The results showed that the implementation of Lesson Study can improve students' mathematical communication ability. This is seen from the average value of tests in Cycle I, which is 69.83 and Cycle II is 84.84..
Journal of Physics: Conference Series, 2020
Heavy metal pollution was a headline issue for environmental degradation, both in water and soil ... more Heavy metal pollution was a headline issue for environmental degradation, both in water and soil environments. Reducing efforts of heavy metal can be carried out through the green system, such as activated carbon from agriculture waste. This paper investigates the properties of activated carbon from banana empty fruit bunches (BEFBs) for heavy metal adsorption. The activated carbon was produced using chemical activation under microwave-assisted. Potassium hydroxide (KOH) is used as an activating agent for concentrations of 2, 3, and 4 M, each sample denoted AC-2M, AC-3M, and AC-4, respectively. The microwave irradiation was performed by a commercial microwave oven with output power up to 630 W for 15 minutes. X-ray diffraction characterization result shows the lower stack length Lc occurs in a sample of AC-2M with a value of 10.966. The surface morphology of all samples shows the presence of non-uniformed pores. The EDX analysis reveals that carbon content of AC-2M is higher than ot...
The purpose of this research is exploratory research by applying Lesson Study, which consists of ... more The purpose of this research is exploratory research by applying Lesson Study, which consists of three stages: planning (Plan), implementation (Do), Objectives, and reflection (See). Subjects in this study are prospective teachers Teachers Faculty of Teacher Training and Education Dehasen University in Statistics courses amounting to 31 people. Data collection was done using observation sheets, test sheets, and documentation. The data were obtained from the observation sheet in the lesson study activity and the test sheets were analyzed descriptively. The results showed that the implementation of Lesson Study can improve students' mathematical communication ability. This is seen from the average value of tests in Cycle I, which is 69.83 and Cycle II is 84.84..
Journal of Physics: Conference Series, 2020
Heavy metal pollution was a headline issue for environmental degradation, both in water and soil ... more Heavy metal pollution was a headline issue for environmental degradation, both in water and soil environments. Reducing efforts of heavy metal can be carried out through the green system, such as activated carbon from agriculture waste. This paper investigates the properties of activated carbon from banana empty fruit bunches (BEFBs) for heavy metal adsorption. The activated carbon was produced using chemical activation under microwave-assisted. Potassium hydroxide (KOH) is used as an activating agent for concentrations of 2, 3, and 4 M, each sample denoted AC-2M, AC-3M, and AC-4, respectively. The microwave irradiation was performed by a commercial microwave oven with output power up to 630 W for 15 minutes. X-ray diffraction characterization result shows the lower stack length Lc occurs in a sample of AC-2M with a value of 10.966. The surface morphology of all samples shows the presence of non-uniformed pores. The EDX analysis reveals that carbon content of AC-2M is higher than ot...