Journal of Aceh Physics Society
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Phytochemical and Antioxidant Activity of Lemongrass Stem Extract and Cream Analysis by Fourier Transform Infrared
No full textoai:jurnal.usk.ac.id:article/48954Lemongrass is one of the plants that grows in Indonesia, is easy to find, and contains active compounds with potential antioxidant properties. The aim of this study was to analyze phytochemical and antioxidant activity of lemongrass stem extract and functional groups in its cream formulation. The lemongrass stems were extracted using the maceration method with 96% ethanol as the solvent, and the resulting extract was evaporated to obtain a thick lemongrass stem extract. The method of analyze the lemongrass stem extract and the cream formulation was carried out using phytochemical screening and antioxidant activity tests were performed on the lemongrass stem extract against 2,2-diphenyl-1-picrylhydrazyl as a free radical and measured at a wavelength of 517 nm using a UV-Vis spectrophotometer. The cream base, and the cream containing the lemongrass stem extract ware tested by fourier transform infrared spectrophotometer to identify functional groups in the extract and cream was conducted using the KBr pellet method. The results showed that the cream with 10% lemongrass stem extract had the strongest antioxidant activity compared to the 7.5 and 5% concentrations, with an IC50 value of 722.12 ppm, which is categorized as weak antioxidant activity. Functional group analysis showed that the cream without the addition of lemongrass stem extract had no absorption or detectable functional groups, whereas the three creams with lemongrass stem extract showed increased transmittance, with the presumed functional groups being hydroxyl (OH), methyl (CH3), and carbonyl (C=O
The Potential of Clamshell (Anadara granosa) as a Source of Calcium Oxide (CaO) in Hydroxyapatite Synthesis
Full text linkAn Analysis of Students' Ability to Solve Problems Related to Newton's Law of Gravitation from a Multirepresentational Perspective
Full text linkThe ability of students to solve physics problems with a correct and deep understanding of concepts is a skill that should be possessed in facing life in the 21st century. One way to identify students who can solve problems is to see their ability to represent physics problems in different formats called multi-representation. This study aims to analyze students' ability to solve Newton's law of gravity problems based on aspects of representation, in this case, the aspects analyzed are verbal, visual, symbol, and mathematical representation. The research method uses quantitative descriptive. The data collection technique used is a test with an essay test instrument with cognitive levels C3, C4, and C5. The study results showed that overall the average score of students' problem-solving ability was 51.7, with a percentage of verbal representation of 73.13%, visual representation 57.25%, symbol representation 63.64%, and mathematical representation 65.45%. Thus, it can be concluded that overall, students' physics problem-solving abilities are in the moderate category, with abilities based on verbal representation aspects in the high category, visual representation in the moderate category, symbol representation in the moderate category, and high category in the mathematical aspect
Analysis of X-ray Fluoroscopy (Siemens) Quality control Using X-ray Multimeter (R/F Raysafe) and PMMA Phantom
Full text linkAbstract.Diagnostic and interventional radiology X-ray machines used by health facilities are required to undergo periodic testing before being put into service. This study was conducted to analyze the appropriateness of a fluoroscopic X-ray machine at a type A hospital in Banda Aceh. Direct quality assurance measurements were performed using a PMMA-type phantom, a fluoroscopic X-ray machine(SIEMENS AGILE MAX), X-ray multimeters,andaluminum filters.The BAPETEN standard No. 2 in 2018was used as a reference.Based on the measurement analysis results, the voltage accuracy measurement is deviated by 0.130.3%higherfrom the voltage setting; however, it remained within the minimum threshold by BAPETEN standard. The radiation beam quality value (HVL) is relatively low compared to the standard minimum value and remained below the threshold. The typical dose rate has met the standard, and the maximum dose rate in the air is also below the set standard. However, the maximum dose rate in the air was observed to be 60 mGy/min at a voltage of 100 kVp
Analysis of Fe Concentration in Iron Sand and the Effect of Stirring Speed on Band Gap Energy in Magnetite Synthesis
Full text linkThe iron sand found on the coast of Aceh has the potential to be developed as a magnetite material. This study aims to analyze the Fe concentration in iron sand and investigate the effect of varying stirring speeds during magnetite synthesis via coprecipitation on the resulting band gap energy. Iron sand was randomly collected from Anoi Itam Beach, Sabang, then separated from non-magnetic material using a bar magnet, washed with distilled water, and ground into a fine powder. The synthesis was carried out using the co-precipitation method with stirring speeds of 800, 900, and 1000 rpm. The Fe content was analyzed using Atomic Absorption Spectroscopy (AAS) in three stages: natural iron sand, prepared iron sand, and dissolved iron sand. After magnetite formation, the energy gap was determined through optical absorption analysis using a UV-Vis spectrophotometer with the Tauc plot approach. AAS results showed an increase in Fe concentration after synthesis after the dissolution of iron sand, while the increase in stirring speed affected changes in the energy gap. This change in the energy gap has implications for the electronic and optical properties of magnetite. It can be concluded that higher stirring speeds result in an increased energy gap, indicating the presence of other iron oxide phases or size quantization effects occurring in the magnetite
Analysis of Higher Order Thinking Skills (HOTS) Students Ability on Temperature and Heat Subject Seen from the Learning Environment
Full text linkThis research aims to analyze the high level thinking abilities (HOTS) of class VII students on temperature and heat subject seen from the learning environment. The HOTS measured includes three aspects: analysis (C4), evaluation (C5), and creation (C6). This research also discusses how specific and general learning environments influence student understanding. This type of research is descriptive qualitative, involving 60 students of SMP Negeri 1 Lhokseumawe, consisting of 30 students from special learning environments and 30 students from general learning environments. Data was obtained through a HOTS-based 9-question written test, interviews and observations. The results show that students from special learning environments have better HOTS abilities, with the highest score on creation (C6) of 45.60%. The low ability of students from general learning environments is due to a lack of support, such as additional tutoring. Schools are advised to provide support programs to improve students' abilities
Development of a Web-Based E-Module with Kahoot Quiz for Physics Learning in Senior High Schools (SMA/MA)
Full text linkThe limited availability of physics teaching materials in schools leads to a lack of engaging learning resources, making the learning process less effective, with some students struggling to stay focused during lessons. As a solution, the researcher developed a Web Quiz Kahoot-based e-module, specifically on the topic of work and energy. This study aims to develop, evaluate the feasibility, and assess the practicality of the Web Quiz Kahoot-based e-module in physics learning. The type of research conducted was Research and Development, utilizing instruments such as validation sheets by subject matter experts, media experts, and practicality questionnaires for students. The development of the e-module employed the ADDIE model (analysis, design, development, implementation, and evaluation). The validation results from material experts indicate a feasibility level of 86.5%, categorized as highly feasible, while validation from media experts obtained a percentage of 97.8%, also categorized as highly feasible. Overall, the average feasibility score reached 93.75%, categorized as highly feasible. The practicality questionnaire results from students showed a percentage of 87%, categorized as highly practical. Based on these findings, it can be concluded that the Web Quiz Kahoot-based e-module is highly feasible and practical for use. This research showed that the Web Quiz Kahoot-based e-module could be used flexibly in both online and face-to-face learning. Teachers could easily access and adapt the material, while students could use it anytime as a self-learning resource
