A procedure for the optimization simultaneous determination zinc by adsorptive stripping voltammetry has been done. The purpose of this study was to obtain the optimum condition of zinc simultaneously. To achieve these objectives, required an optimization technique by using response surface methodology (RSM), with central composite design (CCD). The research design was used CCD with 4 variables, 3 level and 31 a combination of treatments. The first step of 2 k factorial design optimization is: to give the highest level of code values (+1), the lowest level (-1) and code (0) as the center point. Programs have been used for statistical data processing, namely Minitab using RSM. Based on data analysis, the obtained optimum conditions for the simultaneous determination of zinc is the calcon concentration of 0.7018 mmol/L; pH = 7.1845; accumulation potential -0.5628 V, and the accumulation time 62.16 s. The optimum conditions obtained relative standard deviation (RSD) 2.5%, recovery of 98.01%,linier range (0.2-105) µg/L, and limit of detection (LOD) 1.21 (µg/L). This RSM has been successfully applied to the simultaneous determination of zinc in environmental samples.
<p>Bahaya rokok pada umumnya sudah diketahui banyak orang, terutama bagi penghisapnya, karena setiap bungkus rokok terdapat tulisan, merokok dapat menyebabkan kanker, serangan jantung, impotensi dan gangguan kehamilan dan janin. Tingginya kebiasaan merokok dikalangan remaja disebabkan karena mereka belum memahami bahaya merokok bagi kesehatan dan dampak negatif dari nikotin. Oleh karena itu penulis meneliti pengaruh peringatan visual terhadap perilaku merokok remaja.Tujuan penelitian ini adalah untuk mengetahui pengaruh peringatan visual terhadap perilaku merokok remaja. Populasi yang diikutsertakan dalam penelitian ini adalah seluruh siswa laki-laki kelas I dan II yang ada di MAN Model Kota Banda Aceh, dengan sampel 71 siswa. Desain penelitian ini dalam bentuk survey analitik dengan pendekatan <em>cross sectional.</em> Pengumpulan data dilakukan mulai tanggal 17 Juni sampai 18 Juni 2016 dengan menggunakan kuesioner. Hasil penelitian didapatkan bahwa terdapat pengaruh yang signifikan antara ilustrasi gambar dengan perilaku merokok remaja P= 0,003 Odds Ratio 8,06; terdapat pengaruh yang signifikan antara tipografi dengan perilaku merokok remaja P= 0,016 Odds Ratio 5,37; terdapat pengaruh yang signifikan antara warna dan perilaku merokok remaja P= 0,037 Odds Ratio 5,04; terdapat pengaruh yang signifikan antara layout dengan perilaku merokok remaja P= 0,001 Odds Ratio 14,94. Variabel yang paling dominan berpengaruh denagn perilaku merokok remaja adalah layout P= 0,001 Odds Ratio 14,96. Peringan visual pada bungkus rokok yang diperhatikan oleh remaja dapat membantu untuk mengkomunikasikan resiko bahaya merokok yang memiliki potensi mengurangi kebiasaan merokok. Hasil penelitian menunjukan bahwa pengenalan peringatan visual bahaya merokok dapat mengurangi perilaku merokok remaja.</p><p><strong>Kata Kunci</strong>: Peringatan Visual, Perilaku Merokok, Remaja.</p>
Artikel ini didasari oleh tingginya angka kematian ibu pada saat melahirkan, dan disini dituntut adanya pengetahuan suami terhadap Suami Siaga di Nagari Pakan Rabaa, Kecamatan Koto Parik Gadang Diateh, Kabupaten Solok Selatan. Penelitian ini bertujuan untuk mendeskripsikan dan menjelaskan pengetahuan suami mengenai Suami Siaga. Penelitian ini dilakukan dengan pendekatan kualitatif dengan jenis penelitian studi Etnosains. Teknik pemilihan informan dilakukan dengan cara purposive sampling (sampel bertujuan) dengan jumlah informan sebanyak 29 orang. Dalam pengumpulan data dilakukan dengan cara observasi, wawancara dan studi dokumentasi dengan teknik analisis data dari Spradley. Data dianalisis dengan teori Etnosains yang dikemukan oleh James Spradley. Berdasarkan hasil penelitian diperoleh bahwa pengetahuan suami tentang Suami Siaga diperoleh dari informasi keluarga, teman, dan internet. Pengetahuan mengenai suami siaga terdiri atas: 1). pengetahuan suami mengenai penyelamatan ibu hamil melalui pertolongan pertama, 2). Pengetahuan suami mengenai tanda-tanda akan melahirkan ditandai oleh pecah air ketubanm 3). Pengetahuan suami mengenai bahaya melahirkan terlalu tua dan terlalu muda, 4). Pengetahuan suami dalam perawatan kehamilan, yang meliputi gizi ibu hamil dan pemeriksaan kehamilan, 5). Pengetahuan suami mengenai tanda-tanda bahaya dari kehamilan.
Infant mortality is one of the indicators used to measure the quality of life of a nation. The World Health Organization (WHO) stated that one of the main causes of infant mortality is the low birth weight (LBW). Efforts to reduce the incidence of LBW can be done by monitoring risk factors that influence the occurrence of LBW in the prenatal phase. This study aims to identify factors that significantly influence the incidence of LBW babies in Padang, West Sumatra, Indonesia. The analysis was carried out by using Logistic Regression Analysis on the data of maternal births domiciled in Padang, West Sumatra, Indonesia. It was concluded that variables that significantly affect the incidence of LBW are maternal weight, parity, distance from a previous birth, problems during pregnancy, and babies’ gender.
Stunting is a nutritional problem in children characterized by the child’s height that is less than twice the standard deviation of the median standard from children growth that has been determined by the WHO. Stunting is influenced by many factors. If the conditional of these factors are known, it can be expected earlier whether a child is stunted or not. In this study, the prediction of stunting was carried out using the Support Vector Machine (SVM) classification method. SVM is a method to find the best hyperplane that can be used to separate two or more classes. In this study, the parameter of the SVM model that must be determined is the cost value and gamma. Based on the result of research using parameters cost=10 and gamma=5, the estimation result of the classification with 100% accuracy can be obtained.
According to WHO, Indonesia was the third largest country with the biggest number of smokers in the world after China and India. Riskesdas 2018 stated the number of smokers in Indonesia was very high, that was 33 percent with male smoker by 63 percent. Government set smoking hazards warning and included health warnings and informations on cigarette packs, however these did not show a significant effect.This research used analytics survey with cross sectional approach on online taxibike riders by sampling using purposive sampling method so that 155 samples were obtained. There were a significant effect on the intention to quit smoking with variable image illustration OR=3.01 P=0.008, typography OR=3.62 P=0.003, color OR=3.37 P=0.04, layout OR=3.48 P=0.002 and the most influence variable, visual warnings in color forms OR=2.29 P=0.010. The result presented that visual warning signs on cigarette packs could rise the intention to quit smoking on online taxibike riders.
In this research, blended learning strategy using face to face driver model was applied in Mathematical Statistics I. Using this model, traditional learning remains the main approach in delivering lecture materials, while online learning functions as the supplement for the previous approach. The aims are to improve learning outcomes and provide a different learning experience for students. This research is an observational research. It is found that this approach increases students' learning outcome. Students also found that the online learning introduced was useful to enhance their understanding on the materials being studied.
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