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SCALING UP OF THE PYROLYSIS PROCESS TO PRODUCE SILICA FROM RICE HUSK Casnan, Casnan; Noor, Erliza; Hadjomidjojo, Hartrisari; Irzaman, Irzaman; Rohaeti, Eti
Journal of Engineering and Technological Sciences Vol 51, No 6 (2019)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2019.51.6.1

Rice husk is a potential alternative source of silica and silicon. The mechanism of heating (pyrolysis) for the decomposition of rice husk is an important factor in obtaining silica of high purity. Medium-scale pyrolysis to produce silica from rice husk serves as a bridge to connect laboratory-scale production to industrial-scale production. The purpose of this study was to model and scale up the pyrolysis process as a guidance for industrial-scale production. The research method used was experimentally based. An experimental investigation was undertaken in five stages. 1) Analyzing rice husk mass conversion using thermogravimetry analysis (TGA); 2) pyrolysis modeling based on a laboratory investigation using COMSOL Multiphysics version 5.3; 3) medium-scale experiments according to the modeling results; 4) validation of the modeling results by carrying out a medium-scale experiment; 5) silica purity analysis using SEM-EDX. The medium-scale pyrolysis simulation of silica manufacture from rice husk obtained a heating rate of 1.5 °C/min. There was an increase in the heating rate of 1 °C/min when compared to the laboratory-scale process. The pyrolysis of rice husk for the production of silica affects the mass conversion and selectivity of the resulting silica product. The mass conversion produced was 13.33% to 17.87% and the purity of silica produced was 63.99% to 82.74%.

Evaluasi Proses Pembelajaran Dengan Pendekatan Systems Thinking Casnan Casnan; Purnawan Purnawan; Irman Firmansyah; Heti Triwahyuni
Scholaria: Jurnal Pendidikan dan Kebudayaan Vol 12 No 1 (2022)
Publisher : Program Studi Pendidikan Guru Sekolah Dasar, Universitas Kristen Satya Wacana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24246/j.js.2022.v12.i1.p31-38

A quality learning process is a learning process developed based on the results of the evaluation. One of the evaluations of the learning process is the systems thinking approach. This study aims to determine the constraints of the learning process with systems thinking approach and determine problem-solving strategies to improve the quality of the learning process. The research method used is a descriptive qualitative method and group model building. Based on the results of the study, it shows that the objective variable in the learning process is student understanding, the supporting variable to better understand the lecture material is the creativity of the lecturer.

Penerapan Permainan Interaktif Geocaching Untuk Meningkatkan Motivasi Siswa Dalam Belajar Sebagai Inovasi Baru Pembelajaran Matematika casnan casnan; Asep Mahpudin; Evan Farhan Wahyu Puadi
UNION: Jurnal Ilmiah Pendidikan Matematika Vol 6 No 1 (2018)
Publisher : Universitas Sarjanawiyata Tamansiswa

Permainan interaktif â€œGeocachingâ€ adalah media pembelajaran inovatif yang dapat digunakan untuk meningkatkan motivasi belajar Matematika di tingkat SMA. Untuk menguji hal tersebut, penelitian ini dilakukan dalam bentuk penelitian kuasi eksperimen dengan desain pretest-posttest one group design. Subjek dalam penelitian ini adalah siswa SMA di lingkungan kota, terbiasa menggunakan teknologi dan memiliki kemampuan kognisi dari rentang sedang hingga tinggi. Instrumen yang digunakan dalam penelitian ini adalah angket motivasi belajar matematika siswa.Â Hasil analisis data menggunakan uji â€“ t untuk sampel berpasangan diperoleh Sig. Â Â Â Â (2-tailed) = 0,000 < Î± = 0,05, hal ini menunjukan bahwa media pembelajaran Geocaching dapat meningkatkan motivasi belajar siswa pada pelajaran matematika.

Scaling Up of the Pyrolysis Process to Produce Silica from Rice Husk Casnan Casnan; Erliza Noor; Hartrisari Hadjomidjojo; Irzaman Irzaman; Eti Rohaeti
Journal of Engineering and Technological Sciences Vol. 51 No. 6 (2019)
Publisher : Institute for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2019.51.6.1

Rice husk is a potential alternative source of silica and silicon. The mechanism of heating (pyrolysis) for the decomposition of rice husk is an important factor in obtaining silica of high purity. Medium-scale pyrolysis to produce silica from rice husk serves as a bridge to connect laboratory-scale production to industrial-scale production. The purpose of this study was to model and scale up the pyrolysis process as a guidance for industrial-scale production. The research method used was experimentally based. An experimental investigation was undertaken in five stages. 1) Analyzing rice husk mass conversion using thermogravimetry analysis (TGA); 2) pyrolysis modeling based on a laboratory investigation using COMSOL Multiphysics version 5.3; 3) medium-scale experiments according to the modeling results; 4) validation of the modeling results by carrying out a medium-scale experiment; 5) silica purity analysis using SEM-EDX. The medium-scale pyrolysis simulation of silica manufacture from rice husk obtained a heating rate of 1.5 °C/min. There was an increase in the heating rate of 1 °C/min when compared to the laboratory-scale process. The pyrolysis of rice husk for the production of silica affects the mass conversion and selectivity of the resulting silica product. The mass conversion produced was 13.33% to 17.87% and the purity of silica produced was 63.99% to 82.74%.

Kinetika Reaksi Proses Pirolisis Pada Sekam Padi Casnan Casnan
Jurnal Fisika dan Aplikasinya Vol 15, No 3 (2019)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Penelitian ini bertujuan untuk mengetahui kinetika reaksi pada proses pirolisis sekam padi dengan menganalisis karakteristik kurva Thermogravimetry Analysis (TGA). Karakteristik Kurva TGA menjelaskan proses kehilangan massa terhadap suhu pada proses pirolisis dengan berbagai tahapan perubahan fasa material akibat proses pemanasan. Proses pirolisis dipengruhi oleh suhu, waktu, dan laju pemanasan, sehingga dengan menganalisis faktor suhu, waktu dan laju pemanasan akan diperoleh kinetika reaksinya. Kinetika reaksi proses pirolisis berdasarkan persamaan Arhenius, kecepatan reaksi dekomposisi dipengaruhi oleh perubahan massa atau fraksi massa per satuan waktu. Nilai faktor eksponensial (A) akan berpengaruh terhadap kecepatan reaksi proses pirolisis, semakin besar nilai A maka kecepatan reaksinya semakin besar dan sebaliknya. Nilai A pada proses pirolisis sekam padi yang dicuci HCl dan dipanaskan, nilainya lebih kecil jika dibandingkan dengan nilai A proses pirolisis sekam padi tanpa pencucian dan dipanaskan.

Structural and Electrical Properties of Silica Materials from Rice Husks Casnan; Purnawan; Erliza Noor; Hartrisari Hardjomidjojo; Irzaman; Eti Rohaeti; Aditya Kurniawan
ASEAN Journal on Science and Technology for Development Vol. 38 No. 2 (2021): Repurpose & Redefine
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29037/ajstd.697

This study aimed to analyze the structural and electrical properties of silica from rice husks recovered by the process of ashing on a medium-scale furnace with a capacity of 15 kg. Rice husks were burned at a heating rate of 1.5°C/min to a temperature of 900°C, where the temperature was retained for 1 hour each at 400°C and 900°C. The methodology of this research was conducted through the process of ashing, extraction of silica, and characterization of its structural electrical properties. The silica extracted from rice husk ash had a relatively low water content by the low absorption intensity of the group –OH at 3610 cm-1. The silica was dominated more by the siloxane group (Si-O-Si) compared with the silanol group (Si-OH). Based on XRD analysis, the silica structure was confirmed as tetragonal. The silica also had a decreased resistance, impedance, and inductance as the frequency increased. These results indicate that the obstacles contained in silica content decrease with an increase in frequency. The decreasing of dielectric constants was caused by the frequency affecting the capacitance; i.e., increased frequency caused more waves to be transmitted each second. The electric current was turned before the capacitor plate was fully charged, which caused quick charge drainage in the capacitor plate and therefore reduced the ability of a material to store the electric charge.

A ANALISIS FAKTOR-FAKTOR SATISFIERS PADA TINGKAT KEPUASAN SISWA DALAM PEMBELAJARAN OTOMOTIF Purnawan Purnawan; Casnan; Heti Triwahyuni; Budi Santosa
JUMLAHKU: Jurnal Matematika Ilmiah STKIP Muhammadiyah Kuningan Vol 7 No 1 (2021): Edisi Vol. 7 No. 1 2021
Publisher : Program Studi Pendidikan Matematika STKIP Muhammadiyah Kuningan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33222/jumlahku.v7i1.1411

Herzberg's theory of job satisfaction is applied by automotive electrical learning in that the level of student satisfaction in learning automotive had influenced by two factors, namely satisfiers and dissatisfiers. This study aims to describe and analyze satisfiers factors on the satisfaction level of class XI students majoring in TKRO SMK Muhammadiyah 1 Moyudan in the 2019/2020 academic year in studying automotive electricity with a population size of 132 students. This study uses census research because all population units are affordable and possible to avoid data corruption. The variables studied were: satisfiers in learning automotive electricity included achievement of individual student achievements in automotive electrical lessons, self-recognition/actualization in automotive electrical learning, the automotive electrical study itself, self-responsibility to study automotive electricity, and self-potential development of students in studying automotive electrical engineering. The data collection tool used in this research is a questionnaire. The data collected were analyzed by descriptive technique. The results showed that student satisfaction in studying automotive electrical is achieved by satisfying factors

Determination of BLDC Motor Capacity for Electric Car Drive Purnawan Purnawan; Casnan Casnan; Arief Kurniawan; Ananda Riski
Journal of Vocational Education Studies Vol. 4 No. 1 (2021)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/joves.v4i1.4055

The study's objectives were to: determine the type of Brushless Direct Current (BLDC) motor that is right for an electric car drive system with a capacity of one passenger, and Knowing the capacity of the BLDC motor used as an electric car drive system with a capacity of one passenger. This research uses Research and Development (R&D) level 1. The research subjects taken are students and lecturers of Vocational Education, Automotive Technology and Electrical Engineering, Ahmad Dahlan University, totalling eight students four lecturers. Ahmad Dahlan University " AL-QORNI " electric car is planned to use an electric motor type Brushless Direct Current (BLDC) with a capacity of 2000 watts which works with a voltage of 49 volts - 96 volts.

Evaluation of Online Learning Implementation with a System Thinking Approach Casnan Casnan; Heti Triwahyuni; Opah Ropiah; Irman Firmansyah
Jurnal Pendidikan Progresif Vol 12, No 3 (2022): Jurnal Pendidikan Progresif
Publisher : Fakultas Keguruan dan Ilmu Pendidikan, Universitas Lampung

Abstract: Evaluation of Online Learning Implementation with a System Thinking Approach. One of the successes of the learning process can be seen from the student’s grades, but the overall evaluation process based on feedback from students can be done using systems thinking approach. Objective: The systems thinking approach in research aims to find out the obstacles to the online learning process and determine problem-solving strategies to improve the quality of online learning. Methods: The research method used is the descriptive qualitative method and Focus Group Discussion (FGD). Findings: Based on the results of the study, there are 20 variables of obstacles in the implementation of learning that are interrelated and influence the implementation of learning. Conclusion: The results of the study, it shows that the objective variables in learning are the learning process, student understanding of learning material, and value of learning outcomes, the supporting variables to answer the learning objectives are lecturer creativity and student motivation.Keywords: evaluation, online learning, systems thinking approach.Abstrak: Evaluasi Penerapan Pembelajaran Daring dengan Pendekatan System Thinking. Keberhasilan proses pembelajaran salah satunya dapat dilihat dari nilai mahasiswa, akan tetapi proses evaluasi secara menyeluruh berdasarkan timbal balik dari mahasiswa dapat dilakukan dengan pendekatan systems thinking. Tujuan: Pendekatan systems thinking dalam penelitian bertujuan untuk mengetahui kendala-kendala proses pembelajaran secara daring (online) dan menentukan strategi pemecahan masalah untuk meningkatkan kualitas pembelajaran secara daring. Metode: penelitian ini menggunakan metode deskriptif kualitatif dan Focus Group Discussion (FGD). Temuan: Berdasarkan hasil penelitian terdapat 20 variabel kendala dalam pelaksanaan pembelajaran yang saling terkait dan saling mempengaruhi yaitu proses pembelajaran. Kesimpulan: Hasil penelitian menunjukkan bahwa variabel tujuan dalam pembelajaran adalah proses pembelajaran, pemahaman mahasiswa dan nilai mahasiswa, variabel penunjang untuk menjawab tujuan pembelajaran adalah kreativitas dosen dan motivasi mahasiswa. Kata kunci: evaluasi, pembelajaran daring, pendekatan systems thinking. DOI: http://dx.doi.org/10.23960/jpp.v12.i3.202209

Systems thinking in physics learning process Casnan Casnan; Purnawan Purnawan; Irman Firmansyah; Heti Triwahyuni
Berkala Fisika Indonesia : Jurnal Ilmiah Fisika, Pembelajaran dan Aplikasinya Vol 13, No 2 (2022)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/bfi-jifpa.v13i2.23848

Pembelajaran yang berkualitas adalah proses pembelajaran yang didasarkan pada hasil evaluasi. Salah satu evaluasi proses pembelajaran adalah pendekatan berpikir sistem. Penelitian ini bertujuan untuk mengetahui kendala proses pembelajaran dengan pendekatan berpikir sistem dan menentukan strategi pemecahan masalah untuk meningkatkan kualitas proses pembelajaran. Metode penelitian yang digunakan adalah metode deskriptif kualitatif dan group model building. Hasil penelitian menunjukkan bahwa variabel objektif proses pembelajaran adalah pemahaman siswa. Variabel pendukung untuk lebih memahami materi perkuliahan adalah kreativitas dosen. Systems Thinking in Physics Learning Process. Quality learning is a learning process based on the evaluation results. One of the evaluations of the learning process is the systems thinking approach. This study aims to determine the constraints of the learning process with systems thinking approach and determine problem-solving strategies to improve the quality of the learning process. The research method used is a descriptive qualitative method and group model building. The study results show that the learning process's objective variable is student understanding. The supporting variable to better understand the lecture material is the creativity of the lecturer.

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