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All Journal JURNAL PSIKOLOGI UDAYANA JEJAK EKONOBIS (JURNAL EKONOMI DAN BISNIS) Pendas : Jurnah Ilmiah Pendidikan Dasar JURNAL PENDIDIKAN TAMBUSAI Unnes Journal of Public Health Jurnal Pengabdian kepada Masyarakat Nusantara Indonesian Journal of Chemical Science and Technology Ilomata International Journal of Management Jurnal Kesehatan Tambusai Jurnal Ilmiah Raflesia Akuntansi Education Achievement: Journal of Science and Research KARYA: Jurnal Pengabdian Kepada Masyarakat Aptekmas : Jurnal Pengabdian Kepada Masyarakat Edu Society: Jurnal Pendidikan, Ilmu Sosial dan Pengabdian Kepada Masyarakat PANDU: Jurnal Pendidikan Anak dan Pendidikan Umum Jurnal Ilmiah Ekonomi dan Manajemen Jurnal Sains dan Kesehatan MPSJ SULIWA: Jurnal Multidisiplin Teknik, Sains, Pendidikan dan Teknologi
Ayu Andini
Program Studi Psikologi, Fakultas Kedokteran, Universitas Udayana
Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Arts Humanities Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Dentistry Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Immunology & microbiology Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Neuroscience Nursing Physics Public Health Social Sciences Transportation Veterinary Other

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Influence of EM4 Inoculum on Biogas Yield and pH Dynamics in Lettuce and Cabbage Waste Fermentation Ramadhan, Dwi Sapri; Safitri, Wulan Dwi; Wardana, Dian; Fahmi, Jam'an; Zubir, Moondra; Andini, Ayu; Simamora, Elisabeth; Limbong, Julian; Sihotang, Pelita; Husna, Wiki Nadia; Siregar, Nurdin
Indonesian Journal of Chemical Science and Technology (IJCST) Vol. 8 No. 2 (2025): JULY 2025
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v8i2.70612

Abstract

Biogas production from vegetable waste offers a practical pathway for reducing organic residues and supporting small-scale renewable energy systems. This study investigates the influence of EM4 inoculum on gas accumulation and pH dynamics during an 8-day batch fermentation of lettuce and cabbage waste. Four reactors were prepared containing 200 g vegetable waste and 200 mL water with or without 30 g EM4. Gas accumulation was quantified by balloon circumference at day 2, day 4, day 6 and day 8 and converted to volume using geometric calculations. Lettuce generated the highest peak volumes with maximum values exceeding 330 cm³ while cabbage produced less than 60 cm³ under comparable conditions. pH trajectories showed that cabbage plus water decreased from pH 7 to pH 6 whereas lettuce plus water increased from pH 7 to pH 8. Reactors containing EM4 stabilised at pH 6 throughout the fermentation indicating inoculum-supported buffering. These results demonstrate that substrate characteristics strongly influence early-stage gas formation and that EM4 moderates pH fluctuations even under uncontrolled ambient conditions. The findings provide initial evidence that lettuce is a more degradable feedstock than cabbage and emphasise pH regulation as a key requirement for improving methane-oriented biogas performance in simple batch systems.
PENGARUH MANAJEMEN WAKTU TERHADAP KEDISIPLINAN MAHASISWA DALAM MENYELESAIKAN TUGAS PERKULIAHAN PADA PROGRAM STUDI PGSD DI ERA DIGITAL Andini, Ayu; Miftahurrahma; Ainun Sari, Indira; Nurhaedah
Pendas : Jurnal Ilmiah Pendidikan Dasar Vol. 11 No. 02 (2026): Volume 11 No. 2, Juni 2026 Release
Publisher : Program Studi Pendidikan Guru Sekolah Dasar FKIP Universitas Pasundan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23969/jp.v11i02.47907

Abstract

This study aims to analyze the relationship between time management and student discipline in completing academic assignments among students of the Elementary School Teacher Education Program (PGSD) in the digital era. The development of digital technology has provided convenience in the learning process, but it has also created distractions that may affect students’ academic discipline. This research employed a quantitative approach using descriptive and associative methods. The sample consisted of 39 PGSD students. Data were collected through questionnaires using a Likert scale, observation, and documentation. Data analysis was conducted using validity, reliability, normality, and Spearman Rank correlation tests. The results showed that all research instruments were valid, with r-count values higher than the r-table value of 0.316, and reliable, with a Cronbach’s Alpha value of 0.856. The descriptive analysis indicated that students’ time management was in the moderate category with a mean score of 23.77, while student discipline was in the fairly high category with a mean score of 29.26. The normality test showed that the data were normally distributed with a significance value of 0.913 > 0.05. The Spearman Rank correlation test produced a correlation coefficient value of 0.764 with a significance value of < 0.001, indicating a positive and significant relationship between time management and student discipline. The better the students’ ability to manage their time, the higher their level of discipline in completing academic assignments in the digital era.
Co-Authors Abdul Fatah Ainun Sari, Indira Aji Ramansyah, Juni Andri Soemitra Apriani, Neriza Armita Sari, Siti Awalia Rosfyan, Ummi Azmi, Zul Berlian Berlian Cahyani, Cica Delli Yuliana Rahmat Dharma, Budi Dona Wahyuning Laily Drama, Banita Ihfatun Eka Yusnaldi Eni Kartika Sari, Eni Kartika Fahmi, Jam'an Febriani, Adha Fitriasari, Dean Dwi Fuadi, Helmy Gunawan Aji Harti Widiastuti Hasibuan, Siti Marhamah Hasuna, Kamal Hilmi Uly Ul Hidayah Husna, Wiki Nadia Imaduddin, Rahadian Johani Johani, Johani Khairul Wafa, Muhammad Limbong, Julian Metti Rahma Saniagi Mia Pangestu, Kania Miftahurrahma Muhdiah, Muhdiah Muzakkir Baits, Muzakkir Nahariyah, Rif’atun Novia, Nurul Yogi Nurdin Siregar Nurhaedah Purnama, Ahmad Putri, Mega Karina Putri, Salisah Radiansyah, Egi Ramadhan, Dwi Sapri Ridwan, Heri Rochmah, Febby Anggraeni Saepudin Safitri, Latiana Safitri, Wulan Dwi Shafa Salsabila Sihotang, Pelita Simamora, Elisabeth Siregar, Putri Darnisah Siti Samsiah, Siti St Maryam, St Supriyadi Supriyadi Syawala, Malica Ayumba Wardana, Dian Yulianto, Diky Yuliasari, Firda Yusuf, Arief Rahman Zahra Aulia, Febria Zubir, Moondra Zuhairan Yunmi Yunan