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All Journal REKAYASA Socius: Social Sciences Research Journal
Kuswandi, Rendi
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Religion Agriculture, Biological Sciences & Forestry Arts Humanities Computer Science & IT Economics, Econometrics & Finance Education Electrical & Electronics Engineering Engineering Languange, Linguistic, Communication & Media Physics

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Pengaruh Variasi Holding Time pada Proses Single Stage Aging Terhadap Kekerasan dan Mikrostruktur pada Material Paduan Al-Si-Cu-Fe Shieddieque, Apang Djafar; Kuswandi, Rendi
Rekayasa Vol 18, No 1: April 2025
Publisher : Universitas Trunojoyo Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21107/rekayasa.v18i1.26678

Abstract

The Al-Si-Cu aluminum alloy is the most commonly used alloy for household appliances, aircraft materials, automotive, marine vessels, construction, and more. However, cast aluminum alloys still exhibit low mechanical properties, necessitating additional processes to enhance their strength. One method of strengthening aluminum is by varying the composition and/or heat treatment process. The aim of this research is to investigate the effect of aging time variation on the microstructure and hardness of the Al-Si-Cu-Fe alloy. The heat treatment processes conducted in this study include solid solution treatment (T=540°C and t=5 hours) and various single-stage aging treatments (T=155°C and t=4, 5, and 6 hours). Mechanical properties of the aluminum alloy were evaluated through metallographic observations and Brinell hardness testing. Microstructural observations indicate changes in the Silicon microstructure from the As cast sample, which exhibits dendrites, to the formation of AlSi and AlFeSi phases after aging treatment. With longer aging treatments, larger and more dispersed precipitate grains are formed. The variation in holding time has different effects on hardness, with the highest hardness obtained at a holding time of 4 hours during artificial aging, resulting in 71.57 BHN. However, increasing the holding time tends to decrease hardness due to the growth of larger precipitate phases.
Identifikasi Struktur Kebahasaan Judul Berita Media Daring Kompas.com pada Tataran Kategori Kata, Frasa, Klausa, dan Peran Semantis Anggara, Adib; Kuswandi, Rendi; Yusuf, Muhammad Irfan; Kurniawan, Eva Dwi
Socius: Jurnal Penelitian Ilmu-Ilmu Sosial Vol 3, No 6 (2026): Januari
Publisher : Penerbit Yayasan Daarul Huda Kruengmane

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5281/zenodo.18264828

Abstract

News headlines are an important part of journalistic texts because they serve to convey the essence of information in a concise, clear, and attention-grabbing manner. This study aims to identify the linguistic structure of news headlines in the online media Kompas.com. This study uses a qualitative descriptive approach with 20 news headlines taken from Kompas.com as the object of study. Data collection techniques were carried out through documentation, while data analysis techniques were carried out by describing linguistic elements at the word, phrase, clause, and sentence levels. The analysis included word categories, phrase structures, semantic roles, and clause and sentence structures. The results show that Kompas.com news headlines are dominated by declarative sentences with complete and efficient structures, and tend to use nominal phrases and material verbs to convey the main events. In addition, the use of various semantic roles, such as actor, target, time, and place, was found to clarify the information in the news headlines. This linguistic structure reflects the characteristics of online journalistic language, which prioritises information events, language economy, and reader appeal.
Co-Authors Anggara, Adib Shieddieque, Apang Djafar Yusuf, Muhammad Irfan