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Simulation of the effect of regenerator porosity on the performance of zero centrigade thermoacoustic cooler generated by the single-stage thermoacoustic machine for sustainable refrigeration Farikhah, Irna; Aldiansyah, Edo Putra; Khoiri, Nur; Ristanto, Sigit; Wibowo, Setyoningsih
Widya Teknik Vol. 23 No. 2 (2024): November-Profesi Insinyur
Publisher : Fakultas Teknik, Universitas Katolik Widya Mandala Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33508/wt.v23i2.6115

Abstract

Refrigeration systems are an essential need in everyday life. There are lots of modern industry that uses refrigerator for helps maintain temperature stability from overheating and prevents the product from drying out protected from dirt and insect attacks. However, the refrigeration system used in industry still uses a refrigeration system vapor compression and using chlorofluorocarbon (CFC) refrigerant and hydro-chlorofluorocarbons (HCFCs) which are harmful to the environment. Therefore, it requires thermoacoustic cooling generated by the engine single-stage thermoacoustic. This research was conducted numerically. In this research, the effects are simulated stack porosity on the performance of thermoacoustic cooling generated by a single-stage thermoacoustic machine at 0°C. the porosity was varied from 0.37 to 0.97. It was found that the stack porosity was optimal when the porosity is 0.97 and the performance of the cooler is 52 %. Moreover, the lowest heating temperature for the thermoacoustic machine is 217°C. This temperature can be used for waste heat recovery. 
Pemanfaatan Teknologi Digital dalam Pembelajaran Siswa SMP di Kota Semarang Lestari, Maria Yosephin Widarti; Budiman, Theresia Cicik Sophia; Sodiq, Jafar; Ristanto, Sigit
E-Dimas: Jurnal Pengabdian kepada Masyarakat Vol 16, No 2 (2025): E-DIMAS
Publisher : Universitas PGRI Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26877/e-dimas.v16i2.21653

Abstract

Era digital pada industri 4.0 telah membawa banyak perubahan dalam berbagai aspek kehidupan. Beberapa perubahan yang dimaksud meliputi cara berkomunikasi, akses ke informasi, dan penggunaan berbagai bentuk media dalam kegiatan sehari-hari. Perkembangan teknologi ini juga berdampak pada sistem pendidikan dan salah satu teknologi yang sangat memberi dampak adalah penggunaan digital learning. Sekolah Menengah Pertama Negeri (SMPN) 3 Semarang sebagai Mitra Lembaga Penelitian dan Pengabdian kepada Masyarakat (LPPM) Universitas PGRI Semarang menyadari pentingnya meningkatkan kemampuan para guru dalam menerapkan digital learning dalam proses pembelajaran di kelas.  Untuk membantu Mitra PKM UPGRIS dalam mencapai tujuan peningkatan SDM Pendidikan di sekolah tersebut, Tim Pengabdian kepada Masyarakat (PKM) ini perlu menyelenggarakan in-house training  Model Pembelajaran berbasis digital. Tujuan dari kegiatan PKM ini adalah untuk memberikan pelatihan atau pembelajaran kepada para guru di SMPN 3 Semarang.  Kegiatan diawali dengan diskusi tentang kondisi SDM pendidikan di SMPN 3 Semarang yang dilanjutkan dengan identifikasi kebutuhan dan jenis kegiatan yang diperlukan berupa pelatihan atau pembelajaran berbasis digital.  Bentuk kegiatan PKM ini adalah workshop berupa pemberian ceramah atau kuliah dan pendampingan perencanaan pembelajaran berbasis digital learning kepada para guru. Luaran yang diharapkan dari kegiatan PKM ini adalah perangkat pembelajaran kreatif berupa model pembelajaran dan media pembelajaran digital yang tepat yang dihasilkan para guru untuk diimplementasikan dalam proses kegiatan belajar mengajar di SMPN 3 Semarang.
- PENGUATAN PEMBUATAN MEDIA PEMBELAJARAN INTERAKTIF BERBASIS IT MGMP IPA BLORA: - Faisal Kurniawan, Affandi; Sigit Ristanto; Joko Saefan; Nur Khoiri
Amaliah: Jurnal Pengabdian Kepada Masyarakat Vol 9 No 2 (2025): Amaliah Jurnal: Pengabdian kepada Masyarakat
Publisher : LPPI UMN AL WASHLIYAH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32696/ajpkm.v9i2.5281

Abstract

Science teachers of the Blora Regency MGMP experienced obstacles in creating IT-based learning media. The purpose of this PKM activity is to provide assistance to science teachers in creating IT-based learning media for the science learning process in junior high schools as part of teacher professional development. The methods used in this activity are socialization, workshops, and mentoring. Socialization is carried out to agree on the implementation of community service. The workshops that will be implemented include: Designing IT-based interactive learning media with a deep learning approach, Creating AI-based interactive learning media, Utilizing PheT-based interactive learning media, and implementing interactive learning media. In addition to the workshop, this community service activity also provides assistance in creating IT-based media starting from the stage of analyzing media needs, creating AI-based media, and PheT. This activity was carried out for 32 hours of lessons and monitoring the use of learning media by Blora Regency MGMP Science teachers. The results of the community service showed that all participants were able to utilize AI and PhET Simulation in preparing learning media. This was shown in the learning media that had been prepared by participants after completing the community service.
Problem Based Learning and Deep Learning Approach Effects on Student Learning Outcomes Julia, Julia; Ristanto, Sigit; Kuriawan, Affandi Faisal; Khoiri, Nur
Unnes Science Education Journal Vol. 14 No. 3 (2025): December 2025
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/usej.v14i3.25483

Abstract

This study aims to determine the effect of Problem Based Learning (PBL) model assisted by PhET Simulation with Deep Learning approach on student learning outcomes on dynamic fluid topic. The research used a quantitative approach with a quasi-experimental design. The subjects consisted of two XI classes in one of the randomly selected high schools in Semarang. The experimental class used the PBL model combined with PhET simulation to fill in the Learner Worksheet (LKPD) related to the discharge and continuity equations, while the control class did not use PhET and did not fill in the LKPD. Both classes were then given a learning outcome test. The results of the analysis using the Mann-Whitney test showed a significant difference between the learning outcomes of the two classes (U = .000, Z = -5.737, p < 0.001), with the experimental class scoring higher (M = 80) than the control class (M = 19). These findings show that the PBL model assisted by PhET Simulation and a deep learning approach improved student learning outcomes. The conclusion of this study is that the application of PBL model assisted by PhET Simulation and Deep Learning approach effectively improves student learning outcomes on dynamic fluid topic.