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All Journal QiST: Journal of Quran and Tafseer Studies Proceeding of International Conference Health, Science And Technology (ICOHETECH)
Cahyani Windarto
Balai Besar Latihan Kerja Industri Surakarta, Ditjen Bina Lattas Kemnakertrans Jl. Bhayangkara No. 38 Surakarta
Religion Humanities Computer Science & IT Decision Sciences, Operations Research & Management Environmental Science Health Professions Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Medicine & Pharmacology Social Sciences Other

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Meaning of The Word Ta'lamun in The Qur'an Hidayah, Nurul; Rasyid, Ahmad Ridwan Al; Windarto, Cahyani
QiST: Journal of Quran and Tafseer Studies Vol. 3 No. 3 (2024): December
Publisher : Universitas Muhammadiyah Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23917/qist.v3i3.5166

Abstract

The development of meaning occurs in all words in the world. This happens because humans interact with words from a language so that over time they will develop. These changes can be in the form of specializing a word, expanding a word, increasing the meaning of a word, decreasing the quality of a word, deleting the meaning of a word, or multiplying a meaning. This research focuses on library research by examining the word ta'lamun which is used in the verses of the Qur'an. From the verses of the Qur'an studied, it was found that the word ta'lamun experienced a development in the meaning of the word in terms of specialization of meaning, so that the meaning of ta'lamun has a meaning that adapts to the context of the sentence in which the word ta'lamun is located.
Numerical investigation on the combustion performance and emission formation of ammonia spark ignition engine using direct injection and multi coils spark-ignition strategy Windarto, Cahyani; Utami, Indah Wahyu
Proceeding of the International Conference Health, Science And Technology (ICOHETECH) 2025: Proceeding of the 6th International Conference Health, Science And Technology (ICOHETECH)
Publisher : LPPM Universitas Duta Bangsa Surakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47701/7rxrz521

Abstract

Future internal combustion engines can achieve zero carbon emissions by using ammonia, an efficient hydrogen energy carrier with a greater energy density and a more sophisticated production-storage-transportation lifecycle. Ammonia fuel's laminar flame speed is comparatively sluggish, nevertheless, which leads to less than ideal combustion performance. Investigating the impact of direct injection and the multi-coil method on ammonia spark ignition engine performance was the goal of this study. The simulation's output was then verified using standard diesel fuel and the literature on combustion performance for RCEM engines. At four SOIs between 40o and 0o BTDC, with varying multi-coil spark timing of ignition under high compression ratio of 17, the combustion performance and emission production of ammonia direct injection were examined using the created numerical model. As the timing of the spark increased, there was a tendency for the velocity and turbulence intensity to rise and then decline. Increased spark timing can improve ignition stability, reduce combustion time, reduce cooling loss, and boost output power. Ammonia flame propagation is sensitive to temperature and flow field. Regretfully, when the spark timing increases, the NOx emission progressively increases. By offering a basic ignition method for ammonia engines, this result holds promise for the transition of internal combustion engines to zero carbon ammonia engines.
Co-Authors NURUL HIDAYAH Rasyid, Ahmad Ridwan Al Utami, Indah Wahyu