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All Journal Metodik Didaktik International Journal of Renewable Energy Development
Desy Sulistyowati, Desy
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Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering

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PENGARUH PENERAPAN METODE INKUIRI TERHADAP SIKAP ILMIAH SISWA PADA PEMBELAJARAN IPA SEKOLAH DASAR (Penelitian Quasi Eksperimen Pada Pokok Bahasan Energi Listrik dan Perubahannya Untuk Siswa Kelas VI Sekolah Dasar) Sulistyowati, Desy; Putri, Suci Utami; Sumiati, Tati
Metodik Didaktik Vol 11, No 1 (2016): Metodik Didaktik Juli 2016
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/md.v11i1.3784

Abstract

This research is motivated by the lack of attention from the teacher to the learners’ scientific attitude in learning science at elementary school. This happened because of the lack of balance in developing the nature of learning science which resulted in the students’ low scientific attitude. The researchers applied inquiry based learning method. The purpose of this study is to determine the influence of the scientific method of inquiry on the attitudes of students in learning science. This research used quasiexperiment designthrough Non-equivalent control group design. The subject of this study focused on 30 students of class VI A and 34 students of class VI B. The research instrumentsare a questionnaire to measure the students’ scientific attitude in the  pretest  and  posttest, and the observation sheet. The empirical result demonstrated; 1) an increase in the dimensions of scientific attitude in control class with N-Gain value of 0.15 which are included in the low category; 2) an experimental class increased scientific attitude with N-Gain 0.53 which are included in the category; 3) There are significant differences to the scientific attitude of sixth grade students of primary school in the experimental class who obtained learning by using the methods of inquiry and control classes by applying the conventional approach. The results from analysis test, the average difference in gain, with a P value α (H1 acceptable), showing that there were differences in scientific attitude of students because of the effect of applying the method of inquiry. This research is expected to contribute to education, especially the improvement of primary school science teaching.
A techno-economic and environmental analysis of co-firing implementation using coal and wood bark blend at circulating fluidized bed boiler Cahyo, Nur; Sulistyowati, Desy; Rahmanta, Mujammil Asdhiyoga; Felani, Muhamad Iqbal; Soleh, Mochamad; Paryanto, Paryanto; Prismantoko, Adi; Hariana, Hariana
International Journal of Renewable Energy Development Vol 13, No 4 (2024): July 2024
Publisher : Center of Biomass & Renewable Energy (CBIORE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61435/ijred.2024.60234

Abstract

The study aimed to explore the effects of biomass co-firing of coal using acacia wood bark at circulating fluidized bed (CFB) boiler coal-fired power plant with 110 MWe capacity. The analysis focused on main equipment parameters, including the potential for slagging, fouling, corrosion, agglomeration, fuel cost, and specific environmental factors. Initially, coal and acacia wood bark fuel were blended at a 3% mass ratio, with calorific values of 8.59 MJ/kg and 16.59 MJ/kg, respectively. The corrosion due to chlorine and slagging potential when using wood bark was grouped into the minor and medium categories. The results showed that co-firing at approximately 3% mass ratio contributed to changes in the upper furnace temperature due to the variation in heating value, high total humidity, and a less homogeneous particle size distribution. Significant differences were also observed in the temperature of the lower furnace area, showing the presence of a foreign object covering the nozzle, which disturbed the ignition process. A comparison of the seal pot temperature showed imbalances as observed from the temperature indicators installed on both sides of boiler, with specific fuel consumption (SFC) increasing by approximately 0.17%. During the performance test, the price of acacia wood bark was 0.034 USD/kg, resulting in fuel cost of 0.023355 USD/kWh, adding 0.061 cent/kWh to coal firing cost. Despite co-firing, the byproducts of the combustion process, such as SO2 and NOx, still met environmental quality standards in accordance with government regulations. However, a comprehensive medium- and long-term impact evaluation study should be carried out to implement co-firing operations using acacia wood bark at coal-fired power plant. Based on the characteristics, such as low calorific value, with high ash, total moisture, and alkali, acacia wood bark showed an increased potential to cause slagging and fouling.
Co-Authors Felani, Muhamad Iqbal Hariana, Hariana Nur Cahyo Paryanto Paryanto Prismantoko, Adi Rahmanta, Mujammil Asdhiyoga Soleh, Mochamad Suci Utami Putri, Suci Utami Tati Sumiati