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All Journal Komunikasi Fisika Indonesia Jurnal Ekonomi Bisnis Indonesia
Cahyati, Ayu
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Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics

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PENGARUH HARGA, PROMOSI, DAN CUACA TERHADAP KEPUTUSAN PEMBELIANPRODUK BATU SPLIT DI PT BINTANG MERUYA LESTARIJAYA Cahyati, Ayu; Hamzah, Muhammad Ichwan
JEBI | Jurnal Ekonomi Bisnis Indonesia Vol. 18 No. 02 (2023): Jurnal Ekonomi Bisnis Indonesia
Publisher : Sekolah Tinggi Ilmu Ekonomi Bisnis Indonesia

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Abstract

The purpose of this study is to find out how much influence Price, Promotion, and Weather to Decision at PT Bintang Meruya Lestari Jakarta. This type of research is survey research with quantitative approach, where research is done by taking some samples from the population and using questionnaire as data gathering tools. The population of this study is 85 consumers. In this study using a 85 respondents. The research method used primary data. Sampling technique using Accidental Sampling and processed by using SPSS 21.0. From the results of the study showed that all independent variables (Price, Promotion, and Weather) simultaneously or together effect to Decision at PT Bintang Meruya Lestarijaya. Judging from the value of correlation coefficient (R) of 0.609 there is a strong relationship between Price variables Promotion, and Weather to Decision. Then from the calculation of Coefficient of Determination (R2), it can be concluded that the independent variables in this study has an Adjusted R Square value of 0.347 or 34.7%, it shows that the percentage of contribution variable Price, Promotion, and Weather Giving influence of 34.7%, to Decision at PT Bintang Meruya Lestari Jakarta while the rest equal to 65.3% influenced other factor not included in this research.
Effect of coagulation and filtration in slow sand filters on iron absorption in groundwater Cahyati, Ayu; Krisman, Krisman
Indonesian Physics Communication Vol 22, No 1 (2025)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.22.1.53-56

Abstract

The study was done to analyze the results of the filtration system of deep pearl housing groundwater using slow sand filtration methods. The analysis is based on the physical and chemical parameters of color/frequency, pH, iron and Escherichia coli with variations in coagulant, clay and alloy. The color/frequency of frequency before filtration has a value of 16.9 NTU, after value filtration declines 0.6%. The phasing of water before filtration was acid 6, having done filtration the pH of water down to 5.8 but had not reached a normal limit (6.5 – 8.5), so slow sand filters had not been effective in curbing the pH of water. The content of iron metals (Fe) before filtration was 0.1867 mg/l, after being made filtrating the content of iron metals (Fe) on the water was down to 0.021 mg/l. The content of Escherichia coli before filtration was 7 CFU / 100 ml, after exfiltration of the Escherichia coli content was reduced to zero CFU / 100 ml. The study suggests that slow sand filters use variations in coagulating and clay materials are effective in improving the quality of the groundwater in the high-yield housing projects.
Co-Authors Hamzah, Muhammad Ichwan Krisman Krisman