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Jumiati Ilham
Universitas Negeri Gorontalo
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Project-Based Learning and Vocational Self-Concept as Predictors of Employability Skills among Grade XII Vocational High School Students in Gorontalo Sunardi Sunardi; Lanto Mohamad Kamil Amali; Buyung R. Machmoed; Jumiati Ilham; Hasmah Hasmah
Jurnal Pendidikan Terapan Vol 4, No 3 July (2026)
Publisher : Sakura Digital Nusantara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61255/jupiter.v4i3.1214

Abstract

Purpose: This study examined project-based learning and vocational self-concept as predictors of employability skills among Grade XII vocational high school students in Gorontalo, Indonesia. Methods: A quantitative correlational design was used with 215 students selected through proportional random sampling. Data were collected using questionnaires measuring project-based learning, vocational self-concept, and employability skills, and analysed using descriptive statistics, assumption tests, simple regression, and multiple regression. Findings: The descriptive results indicated that students’ responses were predominantly distributed in the high category for project-based learning experience, vocational self-concept, and employability skills. Project-based learning significantly predicted employability skills, R² = 0.471, F (1, 213) = 189.746, p < .001. Vocational self-concept also significantly predicted employability skills, R² = 0.519, F (1, 213) = 229.476, p < .001. Together, both predictors explained 62.3% of the variance in employability skills, R² = 0.623, adjusted R² = 0.620, F (2, 212) = 175.467, p < .001. Vocational self-concept showed a slightly stronger standardized contribution than project-based learning in the simultaneous model. Research implications: Vocational high schools should integrate authentic project-based learning with career-oriented reflection, mentoring, and vocational identity development. Originality: This study integrates a pedagogical predictor and an identity-based predictor in a single employability model within a regional Indonesian vocational education context.
KONVERSI BIOWASTE MENJADI BIOENERGI DAN BIOPRODUK: TINJAUAN DALAM CIRCULAR BIO ECONOMY Siti Fauziah; Ervan hasan Harun; Jumiati Ilham
Journal Of Renewable Energy Engineering Vol. 4 No. 1 (2026): Journal Of Renewable Energy Engineering (April)
Publisher : Program Vokasi-Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56190/jree.v4i1.67

Abstract

The transition toward low-carbon energy systems has repositioned biowaste as a strategic resource within the circular bioeconomy, offering potential to enhance resource efficiency, reduce greenhouse gas emissions, and generate value-added bioproducts. This review aims to analyze the relationship between biowaste characteristics and the selection of conversion pathways, evaluate recent advances in conversion technologies, and propose strategies for developing biorefineries that are technically, environmentally, and economically feasible. The study employs a systematic literature review approach, covering foundational and recent studies on pretreatment optimization, biological and thermochemical processes, and the integration of life cycle assessment (LCA) and techno-economic analysis (TEA). The synthesis reveals that no single technology is universally optimal for all types of biowaste; conversion efficiency depends on the alignment between feedstock composition, pretreatment methods, process configuration, and desired end-products. Anaerobic digestion remains the most suitable option for wet organic waste, while thermochemical processes such as pyrolysis and gasification are more appropriate for lignocellulosic biomass. Additionally, emerging approaches involving microalgae, nanotechnology, and machine learning contribute to improving system efficiency and product selectivity. In conclusion, the development of sustainable circular biorefineries requires feedstock standardization, data-driven process design, and the integration of LCA and TEA to support large-scale industrial implementation.
Co-Authors Abbas, zulkarnain Abdullah, Rafli S Abdussamad, Salmawaty Tansa , Syahrir Ade Irawaty Tolago Ahmad, Agil Amali, L. M. Kamil Amin, Aditya Saputra Amirudin Y. Dako Andi Ima Kesuma Andi Shindy Keyshia Anggi Arafat, Muhammad Yasser Arfan Usman Sumaga Arfan Utiarahman Arifin Matoka Astika putra, I Nengah dwi Bambang Panji Asmara Buyung R. Machmoed Dako, Rahmat D.R Ervan Hasan Ervan Hasan Harun Fiqry Ahmad Gusti Komang Apriadi, I Hakim, Didiet Haryadi Hasan Harun, Ervan Hasmah I Kadek Wardana Wisnuwara I Made Dwi Harinata Ifan Wiranto Ihwaldi Haris Bowta Ikhsan Hidayat Ikhsan Hidayat Iksan Hidayat Ilham, Zul Indah Oktaviani Iskandar Zulkarnain Nasibu Ismail Yusuf, Taufiq Jumardin Jumardin Kadir, Moh. Fitran Kamil Amali, Lanto M. Karim, Aco Lanto Mohamad Kamil Amali Lihawa, Norman Madjowa, Tyo Sulistio Melky Alfazrin Muh Rifai Damogalad Rifai Muh Yusuf Tuloli Muhamad Triyadi Adam Mukhlisulfatih Latief Nova Elysia Ntobuo Nur Hasanah Rafli Rafli Rahmad Hidayat Dongka Rahmani Kadarningsih Rahmat Deddy Rianto Dako Randani Kurniawan Putra Otaya Romi Djafar Salma Kune salma kune Salmawaty Tansa Saputra, Guntur Hadi Sardi Salim septiyusi, Natia nursuci Siti Fauziah Sitti Suhada Sunardi Sunardi . Syahrir Abdussamad Talawo, Diaz Cipta Pratama Taufiq Ismail Yusuf Taufiq Ismail Yusuf Tobuhu, Gilang Ulfatun Nadifa Wahab Musa Wildan Wildan Wrastawa Ridwan Yasin Mohamad Yowan Tamu Yunita Djamalu Yunus Dako, Amirudin