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Moh. Irma Sukarelawan
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INDONESIA
Indonesian Review of Physics (IRiP)
Published by Universitas Ahmad Dahlan
ISSN : 26213761     EISSN : 26212889     DOI : https://doi.org/10.12928/irip
Core Subject : Science, Education,
Astronomy Earth & Planetary Sciences Education Materials Science & Nanotechnology
This journal is continued version of Berkala Fisika Indonesia journal. The journal was published for the first time in 2008. The last published volume was 10 (1) 2018. The ISSN is 2085-0409 (printed version) and 2250-0465 (online version).
Arjuna Subject : Fisika dan Astronomi - Astronomi dan Astrofisika
Articles 5 Documents
 1 
Search results for , issue "Vol. 5 No. 2 (2022)" : 5 Documents clear
Physical Quality of Cow's Milk by Exposure to Magnetic Fields Extremely Low Frequency (ELF) 300 μT and 500 μT by inhibiting Salmonella and Escherichia Coli Growth Sudarti, Sudarti; Permatasari, Elok; Ratnasari, Indri; Laili, Sherly Nur
Indonesian Review of Physics Vol. 5 No. 2 (2022)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/irip.v5i2.5064

Abstract

Extremely Low Frequency (ELF) magnetic field, high intensity (more than 100 µT), can suppress the growth of pathogenic bacteria, but the impact of low intensity (≤ 500 µT) needs to be proven. This study aimed to analyze the physical resistance of cow's milk exposed to a magnetic field of 300 µT and 500 µT ELF by inhibiting the proliferation of Salmonella and Escherichia Coli bacteria. Completely Randomized Design (CRD) research design. Samples were 210 bottles of cow's milk (@ 50 ml) divided into seven groups. Exposure to the ELF magnetic field intensity of 300 μT and 500 μT with exposure variations of 60, 90, and 120 minutes. Result: Exposure to an ELF magnetic field with an intensity of 500 µT for 60 minutes significantly (p < 0.05) reduced the Salmonella sp. population but not Escherichia coli. Even though the physical condition showed the color and smell of fresh milk, lumps did not appear until the 10th hour. Conclusion: exposure to the ELF magnetic field intensity of 300 μT and 500 μT has not been able to maintain the quality of cow's milk.
Cognitive Engagement and Creative Thinking: Intervention with Research-Based e-Learning and Students' Social Attitudes in Learning Physics at Public High School Santyasa, I Wayan; Suswandi, Iwan; Santyadiputra, Gede Saindra; Juniantari, Made
Indonesian Review of Physics Vol. 5 No. 2 (2022)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/irip.v5i2.6084

Abstract

Physics learning in high school is closely related to students' social attitudes in conducting cognitive engagement to achieve creative thinking. This study aims to analyze students' cognitive engagement and creative thinking using research-based e-learning (RBeL) and directed learning (DeL) about students' social attitudes. The samples were randomly selected from 4 classes (two experimental and two control classes). This study used a post-test-only control group design. Data on social attitudes and cognitive engagement were collected using questionnaires, and data on creative thinking using essay tests. Data were analyzed using a two-way Manova and hypothesis testing using a significance level of 5%. The results showed significant differences in the cognitive engagement of students who were intervened using RBeL and DeL. Intervention using RBeL was more effective than DeL in achieving cognitive engagement. There is a significant difference between the creative thinking of students who are intervened using RBeL and DeL. The RBeL intervention was more effective than DeL in achieving creative thinking. There are similarities in cognitive engagement and creative thinking among students with HSA and LSA. There was no interaction between learning models and social attitudes regarding cognitive engagement and creative thinking in students. The achievement of cognitive involvement and creative thinking of 10th-grade students in learning physics is more effective using research-based e-learning models.
Build Students' Research Skills Through Collaborative Real-World Analysis-Based Learning Sinensis, Arini Rosa; Firdaus, Thoha; Saulon, Butch O
Indonesian Review of Physics Vol. 5 No. 2 (2022)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/irip.v5i2.6488

Abstract

Research skills are one of the skills that need to be built for students to face the challenges of the 21st Century. Therefore, this study aims to build research skills through the Collaborative Real-World Analysis (CReW-A) learning model. This study uses the One-Shot Case Study design. Respondents came from 21 Physics Education students who were grouped into seven research groups. Research skills were observed using a 5-point Likert rating scale observation sheet. Students research skills were analyzed using Rasch modeling, the Wright map technique combined with the Logit Value of Person (LVP). After applying the Collaborative Real World Analysis (CReW-A) learning model for four weeks, students' research skills were well-developed in most research groups. So, the Collaborative Real World Analysis (CReW-A) learning model that has been implemented has been able to build the research skills of physical education students. Therefore, in the future, students can use these skills to innovate to face the challenges of the 21st Century.
Perception Scale of Online Learning in the Indonesian Context During the Covid-19 Pandemic: Psychometric Properties Based on the Rasch Model Nursulistyo, Eko; Indratno, Toni Kus; Dwiastuti, Ety; Arifiyanti, Fitria; Dina Puspitasari, Ariati; Abdullah, Nurul Syafiqah Yap binti; Sukarelawan, Moh. Irma
Indonesian Review of Physics Vol. 5 No. 2 (2022)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/irip.v5i2.6544

Abstract

This study aims to evaluate the psychometric properties of students' perception scales about online learning during the Covid-19 pandemic in Indonesian culture. This study involved 176 students (Male = 54% and Female = 46%) at the junior and senior high school levels from public schools in Yogyakarta, Indonesia. The age of the respondents ranged from 11 to 17 years, with a mean of 13.5 years and a standard deviation of 1.4 years. The online learning perception scale adopts 16 items developed by Bhagat and colleagues. The psychometric properties of the scale were evaluated based on the reliability of the person and item, the suitability of the Rasch model, the functionality of using a 5-point rating scale, and its unidimensionality. The analysis results show that the scale has good consistency and performance in the Indonesian context. Sixteen items are a good fit for the model and are unidimensional. The 4-point Likert rating scale is more effective than the original 5-point rating scale. So, 16 items in POSTOL have adequate psychometric properties to be used on students in Indonesia.
Utilization of Seismic Data as a Tsunami Vulnerability Review Khusnani, Azmi; Jufriansah, Adi; Afriyanto, Mulya
Indonesian Review of Physics Vol. 5 No. 2 (2022)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/irip.v5i2.6706

Abstract

This study aimed to analyze seismic data, which is then made into an infographic to map the level of tsunami hazard in the Sikka District. The research was carried out in Sikka District, East Nusa Tenggara, located between 121°55'40''-122°41'30'' east longitude and 08°22'-08°50' south latitude. The data source comes from the IRIS Earthquake Browser, and the analysis stage was carried out in two phases. The first analysis used seismic data analysis, and EQ Energy used IRIS (Incorporated Research Institutions for Seismology) data. Meanwhile, the second analysis maps the tsunami risk by determining the tsunami hazard in areas with the potential for a tsunami. Based on the analysis of seismicity data showed that Sikka District has the potential for an earthquake accompanied by a tsunami. In contrast, the results of the EQ Energy analysis caused by the December 14, 2021 earthquake were known as the value of Ehf = 6.46 × 1014 J  and EBB = 5.48 × 1015 J. The analysis of the level of tsunami susceptibility based on the tsunami run-up height in Sikka District showed that the northern coastal area of ​​Flores had various potentials, where the highest vulnerability level was in the Alok subdistrict and parts of Talibura. Meanwhile, the area with the lowest potential was the Kewapante subdistrict.

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