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All Journal BAREKENG: Jurnal Ilmu Matematika dan Terapan Hexagon
Adlimi, Arsil
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Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Energy Engineering Mathematics Mechanical Engineering Physics Transportation

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PEMANFAATAN LIMBAH FLY ASH DAN BOTTOM ASH SEBAGAI BAHAN TAMBAH DAN BAHAN PENGGANTI UNTUK MENINGKATKAN NILAI KUAT TEKAN BETON Adlimi, Arsil; Hermansyah; Adi Mawardin
Hexagon Vol 6 No 2 (2025): Vol. 6 No. 2 (2025): HEXAGON - Edisi 12
Publisher : Fakultas Teknologi Lingkungan dan Mineral - Universitas Teknologi Sumbawa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36761/hexagon.v6i2.4529

Abstract

The incineration from the coal industry produces waste such as bottom ash and fly ash that can pollute the environment. The use of waste in particular produced by PLTU Kertasari district of West Sumbawa is still not optimal so there needs to be an alternative to address the problem. The study used experimental methods to obtain the composition of a mixture of additive fly ash as cement additive and bottom ash as a substitute for sand on concrete. The objective of the study was to find out the slump values, the Compressive Strength of concrete pressure at age 7 and 28 days on the variations of fly ash 0%, 20%, 40%. and 60% as well as to find the strength comparisons of the pressure concrete life 7 and 28. The study used a cylinder-shaped test object of 15 test objects where for each variation there were 3 testing objects. As for the result obtained is a slump value with additive fly ash producing the largest mixture at 0% variation that is of 11.5 cm. The Compressive Strength value of concrete produced at the age of 7 days is at a variation of 60% which is of 6,09 MPa. Whereas at the age of 28 days the highets compressive strength valeu of concrete was produced at the age of 28 days with a variation of 60% namely 13,02 MPa.
FORECASTING MODEL OF ONIONS IN SUMBAWA DISTRICT Susilawati, Tri; Darmawan, Indra; Ardiansyah, Eka; Adlimi, Arsil
BAREKENG: Jurnal Ilmu Matematika dan Terapan Vol 17 No 1 (2023): BAREKENG: Journal of Mathematics and Its Applications
Publisher : PATTIMURA UNIVERSITY

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (302.466 KB) | DOI: 10.30598/barekengvol17iss1pp0505-0512

Abstract

Sumbawa Regency as the second largest shallot producing area in NTB certainly contributes to food security in Sumbawa Regency in particular and in Indonesia in general. This condition certainly needs to make policy makers predict crop yield growth for the following years. This study aims to predict shallot yields for the next 9 years. The data used is secondary data sourced from the Sumbawa District Agriculture Office. There are three trend forecasting methods used, namely least square method, quadratic and exponential trend models. Based on the calculation results, the best forecasting trend model is obtained, namely the exponential trend model with MAPE and MAD values ​​and the largest coefficient of determination (R2). The exponential trend obtained shows a positive trend, namely positive exponential values ​​and positive principal numbers
Co-Authors Adi Mawardin Darmawan, Indra Eka Ardiansyah, Eka Hermansyah Susilawati, Tri