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All Journal VISIKES Jurnal Pijar MIPA
Eliza, Novi
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Biochemistry, Genetics & Molecular Biology Chemistry Education Mathematics Physics

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POTENTIAL SUNSCREEN OF ETHANOLIC EXTRACT OF CLOVE HERB (Syzygium aromaticum L.) AND BROTOWALI (Tinospora crispa L.) Anggoro, Aloysius barry; Eliza, Novi; Dian Advitasari, Yustisia; Sulistiyanto W.S, F.X.
VISIKES Vol. 23 No. 1 (2024): VISIKES
Publisher : Dian Nuswantoro Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.60074/visikes.v23i1.10446

Abstract

Inflammation, erythema, pigmentation, hyperplasia, immunosuppression, and chronic effects includingphotocarcinogenesis and premature aging are the consequences that can be caused by UV B radiation fromsunlight. This skin damage can get worse and cause DNA damage if the skin is not properly protected. Theaim of this research is to evaluate the light protection factor (SPF) of ethanol extracts of clove and brotowaliherbs using UV-vis spectrophotometry. Evaluate the SPF value using various concentration levels rangingfrom 100, 200, 300, 400 and 500 ppm for each extract. The SPF value is calculated using the Mansurequation, measured from 290-320 nm with an interval of 5 nm. The SPF value obtained from clove herbethanol extract was 2.741; 5,827; 7,895; 10,341; and 13,132, while the ethanol extract of brotowali herb was3,382; 7,166; 10,198; 13,420; and 18,061. The results show that both extracts have considerable potential formaking sunscreen preparations.  
Determining Zoning of Areas Affected by Flood Disasters in Medan City Using Silhouette Coefficient and Davies Bouldin Index Analysis Eliza, Novi; Husein, Ismail; Dur, Sajaratud
Jurnal Pijar Mipa Vol. 19 No. 3 (2024): May 2024
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v19i3.6707

Abstract

Several sub-districts are cities that are pretty or even very vulnerable to flood disasters. Therefore, the Government must observe which areas are highly prone to flooding to anticipate safety precautions. One of the relevant methods for handling this case is k-means clustering using the Silhouette Coefficient and Davies-Bouldin Index evaluation. This research uses a quantitative approach using the Silhouette Coefficient and Davies Bouldin Index Analysis method. Based on the research that has been carried out, the results can be obtained that cluster 1 consists of the sub-districts of Medan Polonia, Medan Johor, Medan Selayang, Medan Baru, Medan Tuntungan and Medan Barat. Cluster 2 only has one member, namely the Medan Maimun sub-district; Cluster 3 consists of Medan Sunggal and Medan Belawan sub-districts, and Cluster 4 consists of Medan Marelan, Medan Helvetia and Medan Timur sub-districts. The results of the clustering evaluation that was carried out obtained a Silhouette Coefficient value of 0.505539942 and a Davies-Bouldin Index value of 0.30055. This means that the grouping carried out in this research is accurate.
Co-Authors Anggoro, Aloysius Barry Dian Advitasari, Yustisia Ismail Husein, Ismail Sajaratud Dur, Sajaratud Sulistiyanto W.S, F.X.