Calcium is an essential nutrient the human body needs to control blood pressure and maintain strong bones and teeth. One type of calcium that is often consumed and safe for health is calcium carbonate. It can obtain this material from chicken eggshell waste, where it is known that the CaCO3 content is 95%. Therefore, it conducted this research to see the phase, functional group, absorbance level, and energy band gap of CaCO3 samples. CaCO3 was synthesized using the calcination method, in which the egg shells were first soaked in sodium hypochlorite, then dried at 250°C for 10 minutes, and CaCO3 powder was obtained. Then the powder was characterized by XRD, FTIR, and UV-Vis. The results of XRD analysis showed that the calcite phase of CaCO3 was 100% according to the JCPDS PDF of calcite (96-901-6707) with a crystalline size of CaCO3 of 22.6 nm. The results of FTIR of CaCO3 samples at the absorption peak of 4000-500 cm-1 identified the functional groups of Ca-O, C-O, -CH2, and O-H. CaCO3 samples can absorb light at wavelengths of 237.1 nm, 251.5 nm, and 289.7 nm, which have an energy band gap of 3.91 eV. Thus, using this simple calcination method, the CaCO3 sample obtained from the extraction of chicken egg shells can later be applied in the medical field.

This article describes the Sangkuriang comic by R.A. Kosasih became several rhymes of advice. The research method used is qualitative and descriptive with data collection techniques in the form of a literature study. There are several rhymes of advice as a result of the transformation of the Sangkuriang comic by R.A. Kosasih. The rhyme of advice is in accordance with the events contained in the comic and does not change the actual theme.Keywords: Sangkuriang comic; advice rhyme; transformationAbstrakArtikel ini mendeskripsikan komik Sangkuriang karya R.A. Kosasih menjadi beberapa pantun nasihat. Metode penelitian yang digunakan yaitu kualitatif dan deskriptif dengan teknik pengumpulan data berupa studi pustaka. Ada beberapa pantun nasihat sebagai hasil transformasi dari komik Sangkuriang karya R.A. Kosasih. Pantun nasihat tersebut sesuai dengan peristiwa yang terdapat dalam komik serta tidak mengubah tema yang sebenarnya.Kata kunci: komik Sangkuriang; pantun nasihat; transformasi

Photovoltaic is a solar cell technology in the field which is very susceptible to damage, both due to corrosion and shocks caused by wind. However, this can be done by using a coating system on the glass material of solar cell panels. Optimization and efficiency can be done by providing a glass and air gap index of about 1.5. This difference can result in about 92% of the transmission of light energy entering the solar cell panel. Technology to reduce reflections on solar panels by using a double coating system called anti-reflective material. The purpose of this study was to examine and find various research articles on SiO 2 -TiO 2 , SiO 2 -ZnO and SiO 2 -MgF 2 materials as antireflection materials in solar cells made with sol-gel spin coating. This research method uses literature reviews from various journals and research articles related to the use of SiO 2 -TiO 2 , SiO 2 -ZnO, SiO 2 -MgF 2 materials. Furthermore, the article is analyzed and studied to find out whether the article is feasible or not to be used as the basis for fabricating solar cells. Furthermore, the article was analyzed and the value to determine whether the results showed a transmittance of 99.7% for SiO 2 -TiO 2 , SiO 2 -ZnO (96.1%) and 98.9% for SiO 2 -MgF 2 materials. From the results of the study, it can be said that SiO2-TiO2 material is a material with the best antireflection performance for solar panels, with these materials can be used as a reference for further research on solar panel technology.