Article Per Year (5 Year)
p-Index From 2021 - 2026
0.751
P-Index
This Author published in this journals
All Journal Indonesian Journal of Geography Jurnal Geosains dan Teknologi Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Jurnal Sains dan Teknologi
Hardiyanto, Dwi Wahyu
Unknown Affiliation
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Dentistry Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Mathematics Mechanical Engineering Medicine & Pharmacology Nursing Physics Public Health Veterinary

Published : 4 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 4 Documents
Search

 1 
Studi Eksperimental Pengaruh Variasi Parameter Perlakuan Panas terhadap Kekerasan Baja Tulangan Polos BJTP280 Imam Rudi Sugara; Hardiyanto, Dwi Wahyu; Ali, Faizah; Fanani, Elvira Wahyu Arum
INSOLOGI: Jurnal Sains dan Teknologi Vol. 4 No. 5 (2025): Oktober 2025
Publisher : Yayasan Literasi Sains Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55123/insologi.v4i5.6485

Abstract

The construction and manufacturing industries require materials with optimal mechanical properties, particularly hardness and toughness. BJTP280 structural steel, classified as low-carbon steel, has the potential to enhance its mechanical properties through heat treatment. This study aims to analyze the effect of variations in austenitizing temperature, holding time, and cooling medium on the hardness and microstructure of the steel. Specimens measuring 10 × 8 mm were heated at temperatures of 750°C, 800°C, and 850°C with holding times of 60, 90, and 120 minutes, followed by cooling in air, oil, and water. Hardness tests were conducted using the Brinell method, while the microstructure was observed with an optical microscope. The results showed that the cooling medium had a significant effect. The highest hardness values were obtained with water quenching at 178 HB, oil quenching at 174 HB, and air cooling at 144 HB. Hardness tended to decrease with increasing holding time due to austenite grain growth. An austenitizing temperature of 800°C produced the optimum condition with the highest hardness value, while 850°C resulted in lower hardness because of excessively coarse grain structures. In conclusion, the best heat treatment was achieved at 800°C, water quenching, and a holding time of 60 minutes.
Analisis Batugamping Sebagai Bahan Baku Semen Di Desa Gombang Kabupaten Gunung Kidul Hardiyanto, Dwi Wahyu; Pandita, Hita
Jurnal Geosains dan Teknologi Vol 8, No 2 (2025)
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jgt.8.2.2025.124-130

Abstract

The Wonosari Formation is composed of reef limestone, which possesses excellent qualifications as raw material for cement production. However, the presence of the Gunung Sewu Geopark has limited the permissible mining areas, making it interesting to study its potential not only as cement raw material but also for other products. The quality and quantity levels of the limestone are of significant importance in both scientific and industrial contexts. The genesis of the limestone in the study area consists of muddy allochem limestone and muddy micrite. Porosity tests indicate that the limestone has a generally moderate to good porosity level, ranging from 15% to 20%, with dominant structures of vug and channel types. Chemically, it meets the standard requirements for economically viable cement raw material, with SiO₂, Al₂O₃, Fe₂O₃, MgO, and SO₃ contents below 5%, and CaO content above 50%.
The Knowledge Driven as Fundamental Analysis in The Geothermal Exploration Activity: Dieng Geothermal Field Study Area Hardiyanto, Dwi Wahyu; Setianto, Agung; Harijoko, Agung
Indonesian Journal of Geography Vol 57, No 3 (2025): Indonesian Journal of Geography
Publisher : Faculty of Geography, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijg.102388

Abstract

Geothermal exploration activities involve a high degree of uncertainty and financial risk, thereby requiring exploration analyses that can support accurate decision-making. This study presents a geothermal exploration method for determining the Geothermal Potential Index (GPI) by integrating surface geological, geophysical, and geochemical data.  The main problem addressed in this study is the testing of a method for conducting geothermal exploration by integrating multiple parameters. Accordingly, this research applies a knowledge-driven approach through the Analytic Hierarchy Process (AHP) to develop a tentative Geothermal Potential Index (GPI) model. The Analytical Hierarchy Process (AHP) serves as a reliable methodological framework for assessing the Geothermal Potential Index by integrating newly obtained and pre-existing data. By incorporating suitability analysis, identifying prospective resources, and formulating geothermal resource criteria, this approach establishes a solid basis for systematic evaluation during the geothermal exploration phase. The tentative model of the geothermal potential index (GPI) for the Dieng volcanic complex has been identified into five zones: Pagerkandang Zone, Siglagah Zone, Pangonan-Merdada Zone, Campursari Zone, and Pakuwaja Zone.
Identification of the Capabilities of the Kerek Sandstone Unit as a Hydrocarbon Reservoir in the Karangkepoh Area and Surrounding Areas, Boyolali, Central Java Hardiyanto, Dwi Wahyu; Nugraheni, Adelia Saras
Jurnal Pendidikan, Sains, Geologi, dan Geofisika (GeoScienceEd Journal) Vol. 7 No. 1 (2026): Februari
Publisher : Mataram University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/goescienceed.v7i1.1714

Abstract

Karanggede is part of the Kendeng Zone physiography, which was formed by compressional tectonics since the Middle Oligocene. This zone consists of deep marine to transitional sedimentary deposits with hydrocarbon reservoir potential. The Kerek Formation in the study area is dominated by layered carbonate sandstone and carbonate mudstone. The study site is located in Karangkepoh Village, Karanggede District, Boyolali Regency, Central Java. Geologically, this unit has undergone structural deformation that affects the physical properties of the reservoir rock. This study aims to evaluate the quantity and quality characteristics of the Kerek Formation carbonate sandstone as a hydrocarbon reservoir. The research methods include field observations and laboratory analysis of porosity and permeability parameters. The test results show very low porosity values, ranging from 1.53% to 1.78%. These porosity values indicate the rock's limited ability to store fluids. In contrast, the permeability values range from 98.53 mD to 906.74 mD. These permeability values are classified as good to very good. This condition indicates the presence of fluid flow paths that develop despite limited effective pore space. The relatively high permeability is controlled by grain size and inter-pore connectivity. The rock texture relationship plays a significant role in determining reservoir characteristics. Overall, the carbonate sandstone of the Kerek Formation in the study area acts primarily as a fluid-flow medium rather than a storage medium.
Co-Authors Agung Harijoko Agung Setianto Ali, Faizah Fanani, Elvira Wahyu Arum Hita Pandita, Hita Imam Rudi Sugara Nugraheni, Adelia Saras