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All Journal JURNAL ILMIAH MATEMATIKA DAN TERAPAN Jurnal Mesin Nusantara
Kartika Chandra Dewi
Universitas Negeri Surabaya
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Mechanical Engineering Transportation

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ANALISA THERMOELECTRIC TEC UNTUK MENINGKATKAN MASSA OKSIGEN O2 PADA PROSES PEMBAKARAN MOTOR BAKAR Khalida, Zulfa; Rahmad, Hadi; Dewi, Yulia Puspa; Dewi, Kartika Chandra; Putranti, Eti
Jurnal Mesin Nusantara Vol 8 No 2 (2025): Jurnal Mesin Nusantara
Publisher : Universitas Nusantara PGRI Kediri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29407/jmn.v8i2.23548

Abstract

Penelitian ini bertujuan untuk menganalisis pengaruh penggunaan Thermoelectric Cooler (TEC) sebagai sistem pendingin udara masuk terhadap performa mesin sepeda motor 110 cc. Sistem TEC dipasang pada saluran intake manifold dan diuji menggunakan dynamometer test untuk membandingkan karakteristik mesin pada kondisi dengan dan tanpa pendinginan udara masuk. Parameter yang dianalisis meliputi daya, torsi, dan Air Fuel Ratio (AFR). Hasil pengujian menunjukkan bahwa pendinginan udara masuk menyebabkan penurunan nilai AFR sebesar sekitar 4,8%, yang mengindikasikan peningkatan densitas udara dan massa oksigen yang masuk ke ruang bakar. Perubahan tersebut berkontribusi pada peningkatan performa mesin, dengan daya maksimum mencapai 6,58 HP pada putaran 5600 rpm, atau meningkat sekitar 1,8 HP dibandingkan kondisi tanpa penggunaan TEC. Namun demikian, efektivitas pendinginan masih dibatasi oleh tingginya kecepatan aliran udara masuk, sehingga diperlukan pengembangan desain sistem pendingin yang lebih optimal pada penelitian selanjutnya.
Higher-order SEM-PLS Modeling of School Readiness Among Indonesian Senior High School Students Dinda Galuh Guminta; Hasanuddin Al-Habib; Ulfa Siti Nuraini; Kartika Chandra Dewi
JURNAL ILMIAH MATEMATIKA DAN TERAPAN Vol. 23 No. 1 (2026)
Publisher : Program Studi Matematika, Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/2540766X.2026.v23.i1.18060

Abstract

Improving the quality of secondary education is a strategic priority in Indonesia due to its impact on human wellbeing. Secondary education faces challenges in improving the quality of learning and students' psychological readiness. School preparation is widely acknowledged as a multifaceted concept that highlights the significance of social-emotional engagement, self-regulation, and cognitive-motivational engagement. Therefore, this study aims to examine the construct of school readiness in Indonesia senior high school students using higher-order SEM-PLS. Results indicate that behavioral regulation is the strongest predictor of academic achievement (0.385) and functions as the central mechanism transmitting social-emotional engagement into academic outcomes. However, cognitive-motivational factors exert a competitive mediating effect, indicating that academic grades do not always improve among students who show strong cognitive-motivational engagement (-0.130). The results of this study highlight the important role of behavioral regulation in academic achievement and indicate that social-emotional engagement exerts the strongest overall influence on cognitive-motivational engagement, thereby supporting a multidimensional integrated model of school readiness.
Co-Authors Dewi, Yulia Puspa Dinda Galuh Guminta Hadi Rahmad Hasanuddin Al-Habib Putranti, Eti Ulfa Siti Nuraini Zulfa Khalida