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Wear Behaviours of Sustainable Biolubricants: Influence of Fatty Acid Compositions and Surface Roughness in Mixed Lubrication Regimes
Advance Sustainable Science, Engineering and Technology
Vol 7
, No 3
(2025)
The advantage of biolubricant compared to mineral oil is that biolubricant can ensure environmental sustainability. This research aims to investigate sustainable biolubricants of virgin coconut oil (VCO) and olive oil on wear behaviours with different fatty acid compositions and surface roughnesses in the mixed lubrication regimes. Tests were carried out on pin-on-disc equipment at a speed of 500 rpm with loads of 50 and 100 N. We used two types of biolubricants and surface roughness of the disk...
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PENGGUNAAN MEDIA BELAJAR PUZZLE SIMBOL PRIBADI MANUSIA UNTUK MENINGKATKAN KEMAMPUAN KOGNITIF PESERTA DIDIK SAPTA DARMA KELAS 5 PADA MATA PELAJARAN PENDIDIKAN KEPERCAYAAN TERHADAP TUHAN YANG MAHA ESA DAN BUDI PEKERTI DI SDN SAMBAN 2 KABUPATEN SEMARANG
NALAR: Jurnal Pendidikan dan Kebudayaan
Vol 4
, No 1
(2025)
Pendidikan abad ke-21 menuntut adanya pengembangan kognitif sebagai bagian integral dari proses pembelajaran. Penelitian tindakan kelas ini bertujuan untuk meningkatkan kemampuan kognitif peserta didik penghayat Sapta Darma Kelas 5 di SDN Samban 2 Kabupaten Semarang, melalui penerapan media puzzle simbol pribadi manusia. Penelitian ini berlangsung selama dua siklus. Variabel bebas dalam penelitian ini yaitu media belajar puzzle Simbol Pribadi Manusia, sedangkan kemampuan kognitif sebagai variab...
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Implementation of the Al-Qur'an Curriculum at Al-Ikhwan Kindergarten Kualuh Hilir in Building Islamic Character in Early Childhood
Paudia
Vol 14
, No 3
(2025)
The Al-Qur'an curriculum implemented in early childhood education institutions can play a role in shaping Islamic character in children. This study aims to explore the implementation of the Al-Qur'an curriculum in Al-Ikwan Kindergarten Kualuh Hilir, North Labuhanbatu, in shaping Islamic character in early childhood. The curriculum is designed by integrating educational values that emphasize moral training, discipline, and basic understanding of Islamic teachings from an early age. This study use...
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Pemeliharaan Preventif Ball Valve Pada Pipa Gas Menggunakan Metode Greasing
Sitepu, Alwi Kenedi
; Situmorang, Andreas Yakobus
; Pratama, Arnold Aditya
; Butar-Butar, Daniel
; Athallah, Muhammad Ilham Fakhri
; Paundra, Fajar
; Athallah, Muhammad Ilham Fakhri
Perwira Journal of Science & Engineering (PJSE)
Vol 5
, No 2
(2025)
Ball valve merupakan salah satu jenis katup yang banyak digunakan dalam sistem perpipaan gas untuk Ball valve merupakan salah satu jenis katup yang banyak digunakan dalam sistem perpipaan gas karena kemampuannya dalam mengontrol aliran fluida dengan cepat dan efisien. Namun, seiring waktu, ball valve dapat mengalami penurunan performa akibat gesekan, kontaminasi, serta paparan lingkungan yang dapat menyebabkan korosi dan kebocoran. Oleh karena itu, pemeliharaan preventif diperlukan untuk memasti...
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2 Sitasi
Development of an Assessment Instrument for Conceptual Understanding, Collaboration Skills, and Learning Motivation on Gas Kinetic Theory
Jurnal Penelitian Pembelajaran Fisika
Vol 16
, No 3
(2025)
This study aims to develop an assessment instrument on the Kinetic Theory of Gases (Boyle's Law) to measure the conceptual understanding, collaboration skills, and learning motivation of high school students in the context of the Independent Curriculum. The instrument developed consists of 10 multiple-choice questions to measure conceptual understanding and 10 questionnaire statements for collaboration skills and learning motivation. The development process follows systematic stages, including p...
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Development of Holistic Assessment Instruments Based on Local Wisdom of Silver Crafts in Kota Gede on Temperature and Heat Topic
Jurnal Penelitian Pembelajaran Fisika
Vol 16
, No 3
(2025)
This study aims to develop an assessment instrument based on local wisdom that covers three domains in physics learning: affective, cognitive, and psychomotor domains, especially on temperature and heat topic. This instrument was developed to assess students' understanding of scientific concepts and attitudes after receiving temperature and heat material using interactive e-books, and remains relevant to the demands of the Merdeka Curriculum. The research method uses the Research and Development...
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Perancangan dan Simulasi Sistem Purging Otomatis pada Sample Probe CEMS di PLTGU PT Jawa Satu Power
Jurnal Elektronika dan Komputer
Vol 18
, No 1
(2025)
Improving the accuracy of emission monitoring in the Continuous Emission Monitoring System (CEMS) is crucial to support compliance with environmental regulations, especially in gas and steam-based power plants (PLTGU). At PT Jawa Satu Power's PLTGU, the purging system on the CEMS sample probe is still performed manually and limited to scheduled preventive maintenance, potentially reducing emission data reliability due to particle contamination. This study aims to design and simulate an automatic...
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1 Sitasi
Perbandingan Kinerja Keuangan Menggunakan Rasio Likuiditas, Solvabilitas, Aktivitas, dan Profitabilitas Pada Perusahaan Sub Sektor Rokok di BEI Tahun 2016-2023
Jurnal Ekonomi, Bisnis dan Manajemen (EBISMEN)
Vol 4
, No 3
(2025)
This study aims to analyze and determine whether or not there are differences in financial performance between cigarette sub-sector companies listed on the Indonesia Stock Exchange in 2016 - 2023. This type of research uses quantitative research with a comparative method. Sampling was carried out using the purposive sampling method and four companies were obtained. The data used in this study are secondary data using the company's annual financial reports. Hypothesis testing was carried out usin...
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3D Model Autocad Of The Piston Displacer Cup For A Gamma Stirling Engine Using The API Method
Rahmat, Rahmat
; Dean Anggara Putra
; Rifo Nurlaksana Restu
; Jefri Imron
; Marhaendra Natawibawa
; Hery Sumardiyanto
; Khairil Munawar
; Thomas Junaedi
Jurnal Elektronika dan Komputer
Vol 18
, No 1
(2025)
When producing a perfect product, design process namely 2D modeling and 3D drawing, are closely related. The purpose of this study is to design a 3D model of a gun mastering machine product as a fan drive using CAD applications. The method of this study is decision data on API production (analytical product inspection). Measurement of sterling machine degradation using CPK (deviation) received results of -0.97, -0.22, 0.86, 0.11, 0.11 between zero and what indicates this specification. On averag...
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Pembuatan Busana Fantasi Aplikasi Bunga Tulip, Kupu-Kupu, Hiasan Kepala Elang Falcon
Jurnal Pengembangan IPTeks Seni Kuliner, Tata Rias, dan Desain Mode
Vol 17
, No 1
(2025)
Fantasy Party Dress is a dress shows beauty and uniqueness. This cloth is that worn for certain events, based on the occasion, fantasy clothing is only used in fashion gshows/carnivals. The purpose of making a report is to find out the process of making a fantasy party dress for the application of tulips, butterflies and falcon headdresses. The report uses qualitative research methods, literature, observation, documentation and data analysis. The making of this Fantasy Party Dress goes through t...
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