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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 134 Documents
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Front Matter IRiP Vol. 3 No. 1 IRiP, IRiP
Indonesian Review of Physics (IRiP) Vol 3, No 1 (2020)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/irip.v3i1.2567

Abstract

Tunnelling Effect for Quadruples Potential Using Matrix Propagation Method Nasiroh, Chilwatun; Supriadi, Bambang; Handayani, Rif'ati Dina
Indonesian Review of Physics (IRiP) Vol 3, No 2 (2020)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/irip.v3i2.3066

Abstract

Semiconductor materials can be used as potential barriers to Tunnelling effects. In this study, four semiconductor materials are arranged in various ways to form a quadruple potential structure to analyze the value of the transmission coefficient. The analysis was conducted using the analytical and numerical matrix propagation method using Matlab2018a. The results confirmed that the inverted arrangement produces the same transmission coefficient value for each energy. So that there are 12 kinds of transmission coefficient values generated from 24 arrangements. The semiconductor material composition with the most considerable transmission coefficient value is ADCB and BCDA, which have a value of 0.8087. The variation of the arrangement affects the value of the transmission coefficient so that it can be used as a guideline for selecting the arrangement that produces the most optimum value of the transmission coefficient from various possible arrangements.
The Effect of the Installation Angle of the Sky Quality Meter on the Night Sky Brightness and the Beginning of the Fajr Prayer Time Raisal, Abu Yazid; Hidayat, Muhammad; Hermawan, Leo; Rakhmadi, Arwin Juli
Indonesian Review of Physics (IRiP) Vol 3, No 2 (2020)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/irip.v3i2.2074

Abstract

Measuring the brightness of the night sky and determining the start of Fajr prayer times can be done using SQM. Observations were made at OIF UMSU with coordinates 3o 34' 55.06" N and 98o 43' 17.09" E. The sky brightness was measured using three SQMs mounted facing the zenith, eastern horizon, and western horizon. The night sky brightness values for SQM directed to the zenith, eastern horizon, and western horizon are 18.23 mpsas, 15.82 mpsas, and 15.47 mpsas. The beginning of fajr prayer time produced by SQM is after the beginning of fajr prayer time obtained using the Accurate Times concerning the Sun's altitude 18o below the horizon. The difference obtained by SQM directed to the zenith, eastern horizon, and western horizon is 29.5 minutes, 36.7 minutes, and 39.5 minutes. In other words, the beginning of Fajr prayer time used in Indonesia is earlier than it should be.
The Analysis of Students’ Critical Thinking and Scientific Literacy Skills Zuhra, Fatma; Nurhayati, Nurhayati; Arifiyanti, Fitria
Indonesian Review of Physics (IRiP) Vol 4, No 1 (2021)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/irip.v4i1.3980

Abstract

This research aimed to determine critical thinking and scientific literacy skills for the tenth-grade students of Bireuen Public High School 2 (SMAN 2 Bireuen). This research used a quantitative approach with a descriptive research design. There were 27 tenth-grade students of the second science class who selected samples through the purposive sampling technique. Descriptive analysis is a research type that does not provide the treatment, manipulation, or modification on the independent variables, but it describes an actual condition. The instrument used in this research was a test adapted from PISA questions. The results showed that the critical thinking and scientific literacy skills of tenth-grade students of SMAN 2 Bireuen were in the fair category. Therefore, it is necessary to apply learning approaches/models that can train students’ scientific literacy skills to get used to carrying out scientific activities, solving scientific problems, providing explanations for a phenomenon scientifically, and using scientific evidence to explain a fact.
Implementation of Learning Cycle’s Model Based on SCL (Student-Centered Learning) to Improve Students’ Creative Thinking Ability in Learning Evaluation Subjects at Universitas Almuslim Fatimah, Fatimah; Taufiq, M.
Indonesian Review of Physics (IRiP) Vol 4, No 1 (2021)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/irip.v4i1.3052

Abstract

The main problems in conducting this research include 1) The ability of the students to analyze the question was less creative in answering; 2) the students learning activities were still low; 3) the students’ interest and response were still low in the instruction. Those problems that had an impact on the instruction were not a success as individual and classical. Therefore, we need an innovative instruction model in enhancing the learning and teaching process, such as; SCL-based Learning Cycle model. This research was Classroom Action Research (CAR) which consisted of planning, acting, observing, and reflecting. This research was the students in the fifth semester in the Physics Education Department that consisted of 21 students. Based on the research results, it was concluded that the implementation of Learning Cycle 5E through SCL-based had improved students’ creative thinking skills, lecturer’s and students’ activities in the teaching and learning process.
Carbon Dots Synthesized from Tofu Pulp for Liquid Tofu Waste Photo-degradation Nurohman, Yosi; Pratidhina, Elisabeth; Sari, Emi Kurnia; Dwandaru, Wipsar Sunu Brams
Indonesian Review of Physics (IRiP) Vol 4, No 1 (2021)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/irip.v4i1.3327

Abstract

This study was aimed to prepare and characterize carbon dots (CDs) from tofu pulp for liquid tofu wastes photo-degradation. The tofu pulp was dried, heated in an oven for an hour at 250 oC, mashed into powder, weighted as much as (g) 1; 2; 3; 4; and 5, dissolved into 100 ml distilled water, filtered, and characterized using UV-Vis, PL, and FTIR. The photo-degradation experiment was conducted for pure waste, waste + CDs, and waste + CDs + UV light, then the BODs were measured. The CDs reduced the wastes to 14.29% and 53.90% without and with UV light, respectively. The pure wastes, wastes + CDs, and wastes + CDs + UV light produced BOD values of (mg/l) 385; 200; and 135, respectively. The decrease in BOD showed that CDs with and without UV light successfully restore dissolved oxygen in the wastes.
The Ground State Energy of Helium Using Hartree-Fock Roothaan With Six Expansion Terms of Gaussian Type Orbital (GTO-6G) Nurlina, Nurlina; Bidalo, Fitriah
Indonesian Review of Physics (IRiP) Vol 4, No 1 (2021)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/irip.v4i1.3862

Abstract

An implementation of the Hartree-Fock Roothaan with six expansion terms of Gaussian Type Orbitals (GTO-6G) is described and used to study the Helium atom’s ground state accurately. The objective of this research is to calculate the ground state energy of the Helium atom. The analysis was conducted using the numerical method using Matlab2017b. By using the Hartree-Fock Roothaan method, the complexity of Hartree-Fock in integrating the differential equations of eigenvalues for each electron is repeatedly successfully overcome by expressing Hartree-Fock orbitals in the form of linear combinations, known as STO (Slater Type Orbitals) and GTO (Gaussian Type Orbital). The Hartree-Fock Roothaan approximation procedure begins by assigning an initial guess value to the elements of the density matrices and then constructing the first Fock matrix from these matrices. The calculation is performed using the various iterations in multiples of 50, show that the error value expressed in relative uncertainty is getting smaller at the 150th iteration, which is around 1.84%. Compared with some literature, the relative uncertainty value is still within tolerance (below 5%). The contribution of theoretical implications in this study can be used as input for other researchers to review the Hartree-Fock Roothaan method and improve accuracy.
Student Self-Regulated in Remote Learning With the Implementation of Local Virtual Lab Based on Online Tutorial (LVL-BOT) Palloan, Pariabti; Rahmadhanningsih, Sri; Viridi, Sparisoma; Jainuddin, Jainuddin; Swandi, Ahmad
Indonesian Review of Physics (IRiP) Vol 4, No 1 (2021)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/irip.v4i1.3783

Abstract

This study aims to measure the level of Self-Regulated Learning (SRL), conceptual understanding and identify an increase in conceptual understanding after using LVL-BOT. This type of research is Pre-Experimental with One-Group Pretest-Posttest Design. The research sample consisted of 37 students from physics classes who took modern physics courses. Students’ level of Self-Regulated Learning is administered using a questionnaire, and understanding of concepts is administered using a test. Based on the analysis results, the percentage level of Self-Regulated Learning is at a value of 87.7%, which is included in the very high category. There is a significant difference between the mean pre-test and post-test mean. The N-Gain Values of Photoelectric Effect and Black Body Radiation are 0.47 and 0.57, respectively. This shows an increase in student’s conceptual understanding, which is “enough” after using LVL-BOT.
Synthesis Nanofiber PVA/Chitosan Using Electrospinning Method and Application for Gold Recovery Prasetya, Dwi Sabda Budi; Ahmadi, Ahmadi; Pangga, Dwi; Nugraheni, Ari Dwi; Harsojo, Harsojo; Supriyanto, Edy; Habibi, Habibi
Indonesian Review of Physics (IRiP) Vol 4, No 1 (2021)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/irip.v4i1.3601

Abstract

This paper introduces a new process of gold recovery using nanofiber PVA/Chitosan from a gold-cyanide solution. Gold recovery in cyanide solution is made using nanofiber PVA/Chitosan produced with electrospinning technique. This research was conducted through several stages, 1) The designing of electrospinning tool, 2) Synthesis of nanofiber PVA/Chitosan with electrospinning technique, and 3) Gold recovery experiment using nanofiber PVA/Chitosan biosorption with the variations of initial concentration and time. The results showed that nanofiber PVA/Chitosan could be used as a gold ion absorber. The occuration of the isotherm process follows the Freundlich isotherm model, which is advantageous and occurs on a heterogeneous surface. From the results, it was agreed that nanofiber PVA/Chitosan is potential for gold recovery.
Implementation of Learning Cycle’s Model Based on SCL (Student-Centered Learning) to Improve Students’ Creative Thinking Ability in Learning Evaluation Subjects at Universitas Almuslim Fatimah Fatimah; M. Taufiq
Indonesian Review of Physics (IRiP) Vol. 4 No. 1 (2021)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/irip.v4i1.3052

Abstract

The main problems in conducting this research include 1) The ability of the students to analyze the question was less creative in answering; 2) the students learning activities were still low; 3) the students’ interest and response were still low in the instruction. Those problems that had an impact on the instruction were not a success as individual and classical. Therefore, we need an innovative instruction model in enhancing the learning and teaching process, such as; SCL-based Learning Cycle model. This research was Classroom Action Research (CAR) which consisted of planning, acting, observing, and reflecting. This research was the students in the fifth semester in the Physics Education Department that consisted of 21 students. Based on the research results, it was concluded that the implementation of Learning Cycle 5E through SCL-based had improved students’ creative thinking skills, lecturer’s and students’ activities in the teaching and learning process.

Page 5 of 14 | Total Record : 134

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