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Yusran Khery
Mandalika University of Education
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Materials Science & Nanotechnology Physics

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Penggunaan PhET Simulations sebagai Laboratorium Virtual untuk Meningkatkan Keterampilan Memecahkan Masalah Mahasiswa Ratna Azizah Mashami; Ahmadi; Yeti Kurniasih; Yusran Khery
Jurnal Penelitian Pendidikan IPA Vol 9 No 12 (2023): December
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v9i12.6549

Abstract

In the Radiochemistry course so far there have been no experimental activities because there are no laboratory facilities.  However, with the use of technology, students can now easily access a wealth of educational resources online. This research aims to determine the effect of using the PhET Simulations as a virtual laboratory on students' problem solving skills. This research used mixed methods that combines quantitative and qualitative research. A quasi-experiment was carried out using a one group pretest-posttest design then continued with in-depth interviews. The instruments used in this research consisted of written tests to collect data on problem solving skills, questionnaires to collect student response, and interview guides to collect data on the problem solving process. Data in the form of problem solving skills were analyzed statistically using the SPSS 22.0 program while data obtained through questionnaires and interviews were analyzed descriptively. The results of the hypothesis test using Wilcoxon signed rank test show a significant value of 0.001, which means that PhET simulations as a virtual laboratory improve students’ problem solving skills. Students are divided into high-medium-low groups based on problem solving ability and the majority of students are in the medium-ability group. Students responded positively to PhET Simulations as a virtual laboratory. In addition, interview transcripts provide an overview of how students think when solving chemistry problems.
Laboratory Assessment of Nyamplung Seeds (Calophyllum Inophyllum Linn) Base Cosmetic Products Yusran Khery; Aliefman Hakim; Joni Rokhmat; AA Sukarso; Husnul Hatimah; Febriana Lidia Wati
Jurnal Penelitian Pendidikan IPA Vol 10 No 8 (2024): August
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v10i8.9050

Abstract

The development of the cosmetics industry in Indonesia is currently very rapid with average market growth reaching 9.67 % per year. The high market potential gives rise to tight business competition in the cosmetics industry, thus encouraging manufacturers to continue to innovate to create new product variations to meet society's demands for cosmetics as a complement to an attractive everyday appearance. This study aims to evaluate the physical characteristics of facial masks, body scrubs and sunscreens from Nyamplung (Calophyllum inophyllum) seed extract at various concentrations (5%, 10%, 15%). The test results showed that the three preparations met the standard physical property test parameters (organoleptic, pH, viscosity, spreadability, etc.). The facial mask formula with 10% extract was most liked by the panelists. Body scrub and sunscreen formulas with 10-15% extract also provide the best physical test results. The SPF value of sunscreen increases with increasing extract concentration up to the ultra category (SPF 17.42 at 15%). This study concludes that Nyamplung seed extract has the potential to be used as a natural ingredient for facial masks, body scrubs and sunscreen with an optimum concentration of 10-15%. Further research is needed regarding antioxidant activity and product stability testing. Overall, the three cosmetic preparations from Nyamplung seed extract show good prospects for development by paying attention to the best extract concentration of each product
Co-Authors AA Sukarso Ahmadi Aliefman Hakim Febriana Lidia Wati Husnul Hatimah Joni Rokhmat Ratna Azizah Mashami Yeti Kurniasih