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All Journal Jurnal Teori dan Aplikasi Fisika Physics Communication Berdaya Indonesian Journal of Community Empowerment
Ian Yulianti
Universitas Negeri Semarang
Astronomy Education Electrical & Electronics Engineering Materials Science & Nanotechnology Physics Social Sciences

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Soil Quality of Maize and Chili Plants Based on Soil pH in Gemuhblanten Village Nafisah Irfani Setiasiwi; Fianti Fianti; Ian Yulianti
Physics Communication Vol. 9 No. 1 (2025): February 2025
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/pc.v9i1.15103

Abstract

Soil pH is an indicator of soil quality that is important to note because it  affects the balance of nutrients in the soil. This is important, especially to maintain the fertility of agricultural land. The purpose of this study was to analyze soil quality based on the soil pH of maize and chili plants. The research sample was taken on the agricultural land of Gemuhblanten Village, Gemuh District, Kendal Regency ins October 2022. Sampling was carried out at six points on each of the maize and chili field. The initial pH data obtained was then averaged. It was obtained that the average soil pH of maize plants was 7.75 which was in the "slightly alkaline" criteria. The average soil pH of chili plants is 7.08 which is a "neutral" criterion The soil pH value for maize plants is slightly higher than the good soil pH for maize plants. Meanwhile, the pH of the soil in chili plants meets a good soil pH value for chili plants.
Training and Implementation of DIGICOM to Enhance Elementary Science Learning through Community Service Innovation Bambang Subali; Ian Yulianti; Imam Sumpono; Nila Prasetya Ariyani; Natalia Erna Seytaningsih; Toni Wahyudi
BERDAYA Indonesian Journal of Community Empowerment Vol. 3 No. 2 (2024)
Publisher : Universitas Negeri Semarang

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Abstract

This community service program was conducted to enhance the competencies of elementary school teachers in utilizing the innovative teaching aid Digital Image Creator for Optical Microscope (DIGICOM) to strengthen science learning. The program was motivated by the limited availability of digital microscopes in schools and the low ability of teachers to adapt optical learning technologies. The main objective was to train teachers from the Imam Bonjol Teacher Working Group (KKG) in Banjarnegara Regency to modify conventional optical microscopes into digital microscopes integrated with imaging systems. The training was carried out online through a series of activities including lectures, discussions, camera adapter design workshops, DIGICOM implementation, and mentoring with follow-up evaluations. A total of 51 teachers actively participated in the practice sessions and group projects. The results showed a significant improvement in teachers’ conceptual understanding, technical skills, and motivation to implement DIGICOM in science learning. More than 85% of participants were able to operate the modified tool successfully and apply it in their schools. These findings demonstrate that the implementation of DIGICOM is an effective educational innovation to improve the quality of science learning in elementary schools and strengthen teachers’ digital literacy in science education.
Karakterisasi Absorbansi Material Expanded Polystyrene (Eps) Menggunakan Spektrofotometer Uv-Vis Nishfa Mufatihah; Ian Yulianti; Teguh Darsono; Budi Astuti
Jurnal Teori dan Aplikasi Fisika Vol. 14 No. 01 (2026): Jurnal Teori dan Aplikasi Fisika
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtaf.v14i01.546

Abstract

Expanded Polystyrene (EPS) merupakan polimer termoplastik yang banyak digunakan karena sifatnya yang ringan, tahan kimia, dan mampu menyerap serta mentransmisikan radiasi elektromagnetik, termasuk cahaya tampak dan ultraviolet. Penelitian ini bertujuan untuk mengkaji pengaruh suhu pemanasan terhadap sifat optik EPS, khususnya nilai absorbansi dan indeks bias, dalam konteks aplikasinya sebagai material inti pandu gelombang optik. Tiga sampel EPS disiapkan: tanpa pemanasan, serta dipanaskan masing-masing pada suhu 150 °C dan 220 °C. Proses fabrikasi melibatkan pelarutan EPS dalam toluena, dilanjutkan dengan aplikasi larutan ke kaca objek, dan karakterisasi dilakukan menggunakan spektrofotometer UV-Vis pada rentang panjang gelombang 200-1200 nm. Hasil pengujian menunjukkan bahwa pemanasan EPS pada 150 °C menurunkan absorbansi UV dan meningkatkan kekakuan material, sementara pemanasan pada 220 °C menyebabkan peningkatan kembali absorbansi akibat pembentukan gugus kromofor, namun menurunkan fleksibilitas material. Sampel tanpa pemanasan menunjukkan absorbansi tertinggi dan indeks bias terbesar (n ≈ 1.59), serta fleksibilitas yang optimal. Berdasarkan hasil ini, EPS tanpa pemanasan dinilai paling layak untuk diaplikasikan sebagai material inti dalam sistem pandu gelombang optik berbasis polimer.     Kata kunci: Expanded Polystyrene (EPS), Indeks Bias, Spektroskopi, UV-Vis
Co-Authors Bambang Subali Budi Astuti Fianti Fianti, Fianti Nafisah Irfani Setiasiwi Natalia Erna Seytaningsih Nila Prasetya Ariyani Nishfa Mufatihah Sumpono, Imam Teguh Darsono Toni Wahyudi