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All Journal International Journal of Applied Mathematics, Sciences, and Technology for National Defense Jurnal Media Teknik Sipil
Chandra, Yoshua
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Biochemistry, Genetics & Molecular Biology Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Engineering Materials Science & Nanotechnology Mathematics Physics Transportation

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Mixed linear model for investigating food security during the covid-19 pandemic: Panel data for rice consumption in indonesia Aisyah, Mutiara Aghnyn; Putri, Devita Amalia; Chandra, Yoshua; Syazali, Muhamad; Machmud, Amir; Rachmawati, Ro'fah Nur
International Journal of Applied Mathematics, Sciences, and Technology for National Defense Vol 1, No 1 (2023): International Journal of Applied Mathematics, Sciences, and Technology for Natio
Publisher : FoundAE

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58524/app.sci.def.v1i1.174

Abstract

The Covid-19 pandemic has affected human life behavior, starting from health, the economy to living habits, one of them is the rice consumption. This study aims to find out whether the Covid-19 pandemic can affect people's rice consumption, and what are the factors that can affect people's rice consumption before and during the pandemic. The independent factors studied in this study were harvested area, productivity, rice production, crime rate, and the ratio of household gas use, with rice consumption as the dependent variable. The data used is panel data for 2019 and 2020, from 34 provinces in Indonesia, which is one of the five countries with the highest rice consumption in the world. By using mixed linear models, the research results show that in general Covid-19 pandemic has not had a significant effect on rice consumption in Indonesia. Other facts also show that social factors, namely the crime rate during a pandemic, did not have a significant effect on rice consumption.However, this is different from economic factors such as productivity and harvested area which have a significant positive effect on rice consumption in Indonesia.
Analisis Pengaruh Penggunaan Sedimen Bendungan Bili Bili Sebagai Substitusi Agregat Halus Terhadap Kuat Tekan Beton Chandra, Yoshua; Mursalim; Kalangi, Hendry Tanoto
Jurnal Media Teknik Sipil Vol. 3 No. 1 (2025): Jurnal MeDia Teknik Sipil, Vol. 3, No. 1, 2025
Publisher : Program Studi Teknik Sipil, Fakultas Teknik, Universitas Atma Jaya Makassar

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Abstract

increase while the supply is getting smaller so that it needs a partial substitute alternative to concrete mixtures to overcome the limitations of using natural materials. The purpose of this study is to find out how much influence the compressive strength results from the substitution of fine aggregate with sediment from the Bili Bili Dam. The method used in this study is an experimental method that refers to the SNI 7656-2012 testing standard. The variation in the sediment percentage in this study was 0%, 2.5%, 5%, 7.5% and 10% of the weight of the fine aggregate used. The concrete quality planned in this study is 14.53MPa and uses cylindrical samples measuring Ø15cm and 30cm high, as well as cubes with a width of 15cm and a height of 15cm. Based on the results of the study, the compressive strength value for the use of sediment as a substitute for some fine aggregate successively reduced the compressive strength of concrete during the age of 3, 7, 14, 28 days from the planned concrete quality to be reduced by 3.8%, 13.67%, 22.10%, 34.44% and 48.72%, the cause of reduction by the high mud content in the sediment.
Co-Authors Aisyah, Mutiara Aghnyn Amir Machmud, Amir Kalangi, Hendry Tanoto Muhamad Syazali Mursalim Putri, Devita Amalia Rachmawati, Ro'fah Nur