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All Journal POSITRON ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika Lumbung Inovasi: Jurnal Pengabdian Kepada Masyarakat INSECTA: Integrative Science Education and Teaching Activity Journal Jurnal Kolaboratif Sains Inovasi Fisika Indonesia (IFI) JSEP (Journal of Science Education and Practice) Unnes Science Education Journal Journal of Dedication in Community (JoDiC)
Firdaus, Rohim Aminullah
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Introduction to Robotics Technology for High School Students in Nganjuk Regency through Line Follower Robot Training Firdaus, Rohim Aminullah; Meta Yantidewi; Endah Rahmawati; Dzulkiflih; Muhimmatul Khoiro; Nugrahani Primary Putri
Journal of Dedication in Community Vol. 2 No. 2 (2024)
Publisher : Department of Physics, Faculty of Mathematics and Natural Sciences (FMIPA) Universitas Negeri Surabaya (UNESA)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/jodic.v2n2.p17-24

Abstract

In the era of rapid technological advancement, mastering robotics has become crucial for the younger generation. A community service program by the Physics Study Program lecturer team of Surabaya State University introduced robotics training to high school students at SMAN 1 Nganjuk. This program aimed to foster interest in science and technology, enhance critical thinking, and develop problem-solving skills. The training included systematic steps such as needs analysis, material preparation, implementation, and evaluation. Students learned to design, assemble, and test line follower robots, integrating theory and hands-on practice to understand robotics concepts and techniques comprehensively. The program's outputs include video documentation, news articles, training modules registered as Intellectual Property Rights (IPR), and scientific articles for national journals. Supported by the Nganjuk Regency Education Office, the program aims to enhance students' technological competencies and inspire greater achievements. It also serves as a model for similar initiatives in other regions, promoting technology education development in Indonesia. Evaluation based on participant questionnaires showed positive results: understanding of material (80%), material relevance (81%), usefulness (83%), instructor quality (87%), facilities (93%), and training time adequacy (83%). Overall, the program achieved very good results, successfully engaging students and meeting its objectives.
Analyzing Misconceptions Using Four-tier Test on the Topic of Vibration: A Survey of Pre-service Science Teachers Winarno, Nanang; Afifah, Ratih Mega Ayu; Sihombing, Rizky Agassy; Firdaus, Rohim Aminullah; Damopolii, Insar
Unnes Science Education Journal Vol. 14 No. 1 (2025): April 2025
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/usej.v14i1.20612

Abstract

Vibration is one of the essential topics in science education. Pre-service science teachers still often experience difficulties in learning this topic. There are several previous studies related to misconceptions on the topic of vibration. However, research on misconceptions in pre-service science teachers is still limited. This study aimed to analyze pre-service science teachers' misconceptions on the topic of vibration. This research uses a quantitative approach with a survey method. The research instruments include a four-tier test and interviews. The participants in this study consist of 96 pre-service science teachers from a university in Bandung, Indonesia. The results of the analysis showed that pre-service science teachers who had Scientific Knowledge were 31.1%, lack of knowledge 26.9%, misconception 8.0%, false positive 1.8%, and false negative 2.2%. The most common misconception found relates to the relationship between frequency and mass. The perception of pre-service science teachers regarding the four-tier test questions is very easy 0%, easy 6.7%, neutral 36.7%, difficult 53.3%, and very difficult 3.3%. The findings show that many pre-service science teachers still have misconceptions about the topic of vibration so lecturers should strengthen the concepts of Fundamental Physics first before students take advanced physics courses.
Analisis Kinerja EDFA dalam Sistem WDM untuk Aplikasi Komunikasi Optik dan LiDAR: EDFA Performance Analysis in WDM Systems for Optikal Communication and LiDAR Applications Al-Hilalliyah, Shafiyyah; Annastasya, Fira Maya; Anes Liovi Putri Tse, Bertina; Firdaus, Rohim Aminullah; Rahmawati, Endah
Jurnal Kolaboratif Sains Vol. 8 No. 6: Juni 2025
Publisher : Universitas Muhammadiyah Palu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56338/jks.v8i6.7414

Abstract

Peningkatan kebutuhan akan transmisi data berkecepatan tinggi mendorong pengembangan teknologi seperti Wave Division Multiplexing (WDM) dalam sistem komunikasi serat optik yang memungkinkan untuk meningkatkan kapasitas transmisi.. Namun, sistem WDM menghadapi tantangan seperti redaman dan dispersi sinyal yang dapat menurunkan kualitas transmisi jarak jauh. Penelitian ini bertujuan untuk menganalisis kinerja penguat Erbium-Doped Fiber Amplifier (EDFA) dalam sistem WDM 4 kanal, yang penting untuk optimasi komunikasi optik dan aplikasi Light Detection and Ranging (LiDAR). Metode penelitian ini menggunakan pemodelan dan simulasi dengan software Optisystem 17.1, dengan variasi panjang serat optik dan nilai forward pump power EDFA. Hasil simulasi menunjukkan bahwa peningkatan panjang serat optik menyebabkan penurunan nilai Optikal Power Meter (OPM), mengindikasikan peningkatan redaman. Namun, penggunaan EDFA secara signifikan mengurangi Bit Error Rate (BER), yang membuktikan efektivitasnya dalam menjaga kualitas transmisi. Kesimpulannya, EDFA memainkan peran krusial dalam meningkatkan kinerja sistem WDM, yang relevan untuk komunikasi optik dan pengembangan LiDAR.
Optimalisasi Antena Rectangular Slotted Bowtie (RSB) Menggunakan Metode Pencocokan Inset feed Untuk Perangkat IoT : Optimization of Rectangular Slotted Bowtie (RSB) Antenna Using Inset feed Matching Method for IoT Applications Adella Juniar Safitri; Safina Ayu Damayanti; Dzulkiflih; Firdaus, Rohim Aminullah
Jurnal Kolaboratif Sains Vol. 8 No. 6: Juni 2025
Publisher : Universitas Muhammadiyah Palu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56338/jks.v8i6.7533

Abstract

Perkembangan Internet of Things (IoT) memerlukan akan antena nirkabel yang efisien serta juga hemat daya. Penelitian ini punya tujuan untuk mengoptimalkan antena Rectangular Slotted Bowtie (RSB) melalui pemakaian metode Inset feed untuk IoT pada frekuensi 2,4 GHz. Jenis simulasi Finite Difference Time Domain (FDTD) dipakai pada riset eksperimental serta perancangan yang berbasis CST Studio Suite 2019. Populasi penelitian meliputi suatu desain antena RSB dengan variasi di parameter-parameter geometris. Contohnya adalah dua konfigurasi dipilih secara sengaja yaitu dengan Inset feed atau tanpa itu. Desain Inset feed terbukti memiliki kinerja lebih baik pada penyesuaian suatu impedansi menurut penelitian dan penambahan nilai bandwidth sebesar 620 MHz yang membantu kinerja antena semakin baik. Lebar pita juga menjadi lebih baik di dalam desain itu. Dengan desain yang ringkas dan performa yang baik, antena ini sesuai bagi aplikasi IoT seperti yang dibutuhkan dalam monitoring lingkungan serta bagi system pertanian cerdas
Permodelan Antena Circular Menggunakan Inset-feed Untuk Penerapan Internet of Things: Modeling of Circular Antenna Using Inset-Feed for Internet of Things Applications Safina Ayu Damayanti; Adella Juniar Safitri; Dzulkiflih; Firdaus, Rohim Aminullah
Jurnal Kolaboratif Sains Vol. 8 No. 6: Juni 2025
Publisher : Universitas Muhammadiyah Palu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56338/jks.v8i6.7535

Abstract

Perkembangan pesat teknologi Internet of Things (IoT) menuntut sistem komunikasi nirkabel yang andal, efisien, dan hemat daya. Antena mikrostrip menjadi solusi potensial karena ukurannya yang kompak dan konsumsi daya yang rendah. Penelitian ini merancang dan menganalisis antena mikrostrip berbentuk circular dengan teknik inset-feed yang dioptimalkan untuk aplikasi IoT pada frekuensi 2,4 GHz. Desain menggunakan substrat FR-4 dan dilakukan simulasi menggunakan metode FDTD. Hasil simulasi menunjukkan bahwa antena memiliki kinerja yang baik dengan nilai return loss sebesar 36,901 dB, VSWR 1,0314, gain 2,11 dBi, dan bandwidth sebesar 546 MHz. Pola radiasi directional berbentuk angka delapan memperlihatkan performa radiasi yang mendukung aplikasi IoT. Teknik inset-feed terbukti meningkatkan pencocokan impedansi tanpa memerlukan struktur tambahan, sehingga desain lebih sederhana dan efisien. Dengan demikian, antena ini layak diterapkan pada perangkat IoT yang membutuhkan desain ringkas dan performa tinggi.
FROM ONLINE TO IN-PERSON: STUDENTS’ MOTIVATION AND SELF-REGULATION IN SCIENCE TEACHING ACTIVITIES DURING AND AFTER THE COVID-19 PANDEMIC Syauqi, Salma Kaisan; Winarno, Nanang; Samsudin, Achmad; Damopolii, Insar; Firdaus, Rohim Aminullah
INSECTA: Integrative Science Education and Teaching Activity Journal Vol. 5 No. 1 (2024)
Publisher : Science Education, Institut Agama Islam Negeri Ponorogo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21154/insecta.v5i1.8689

Abstract

This study aims to find out the differences in students’ motivation and selfregulation in science teaching activities during and after the COVID-19 pandemic and the strengths and weaknesses of science teaching activities during and after the COVID-19 pandemic from students’ perceptions to improve students’ engagement and achievement in science. This study used a survey design involving 469 junior high school students from 7th, 8th, and 9th grades from 30 different schools located in West Java, East Java, West Nusa Tenggara, Central Java, Special Capital Region of Jakarta, Riau, and East Kalimantan. The instrument consisted of an adapted version of the SALES Questionnaire with a 5-point Likert scale and open-ended questions. Data analysis was carried out by quantitative and qualitative methods. The results showed that students’ motivation and self-regulation in science teaching activities during and after the COVID-19 pandemic were significantly different. The strengths of science teaching activities during the COVID-19 pandemic are flexibility, fewer distractions, and the availability of more learning resources, while the weaknesses are a lack of explanation and understanding, uninteresting, limited interaction, and limited practical activities. The strengths of science teaching activities after the COVID-19 pandemic are clearer explanations, availability of practical activities, and ease of interaction, while the weaknesses are distractions from peers, limited learning resources, and boring. The findings from this study provide an opportunity for science teachers to plan and implement effective learning strategies to increase students' motivation and self-regulation to improve their engagement and achievement in science.
Analisis Kinerja Sistem LiDAR (Light Detection and Ranging) dalam Pengukuran Jarak dengan Pendekatan Simulasi: Evaluasi Ketepatan dan Keandalan Pengukuran: Analysis of LiDAR (Light Detection and Ranging) System Performance in Distance Measurement using Simulation Approach: Evaluation of Measurement Accuracy and Reliability Nikmah, Afiyah; Riski Ramadani; Dzulkiflih; Muhimmatul Khoiro; Firdaus, Rohim Aminullah
Jurnal Kolaboratif Sains Vol. 7 No. 5: MEI 2024
Publisher : Universitas Muhammadiyah Palu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56338/jks.v7i5.5250

Abstract

Studi ini menyajikan analisis kinerja sistem LiDAR dalam pengukuran jarak dengan memanfaatkan pendekatan berbasis simulasi. Sistem LiDAR banyak digunakan dalam berbagai bidang karena kemampuannya untuk mengukur jarak secara akurat. Namun, menilai akurasi dan keandalan pengukuran LiDAR dalam berbagai kondisi sangat penting untuk memastikan efektivitasnya dalam aplikasi praktis. Dalam penelitian ini, sebuah kerangka kerja simulasi dikembangkan untuk meniru operasi sistem LiDAR dan menghasilkan pengukuran jarak dengan mempertimbangkan faktor lingkungan dan noise pengukuran. Pengukuran yang disimulasikan kemudian dianalisis untuk mengevaluasi akurasi dan keandalan sistem LiDAR dalam pengukuran jarak. Melalui analisis perbandingan dan evaluasi statistik, wawasan tentang kinerja sistem LiDAR diperoleh, yang menyoroti kelebihan dan keterbatasannya. Temuan dari penelitian ini memberikan kontribusi pada pemahaman yang lebih baik tentang teknologi LiDAR dan memberikan panduan untuk mengoptimalkan kinerjanya dalam aplikasi berbagai bidang. Penelitian ini menegaskan pentingnya penilaian berbasis simulasi dalam menilai kemampuan sistem LiDAR dan memberikan informasi bagi proses pengambilan keputusan dalam berbagai bidang yang bergantung pada pengukuran jarak yang akurat.
Analisis Pengaruh Variasi Fiber Doped Amplifier dan Panjang Gelombang Laser terhadap Optical Power pada Perancangan Sistem FMCW LiDAR: Analysis of the Effect of Variations in Doped Fiber Amplifier and Laser Wavelength on Optical Power in FMCW LiDAR System Design Ramadani, Riski; Yantidewi, Meta; Firdaus, Rohim Aminullah; Afiyah Nikmah
Jurnal Kolaboratif Sains Vol. 7 No. 5: MEI 2024
Publisher : Universitas Muhammadiyah Palu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56338/jks.v7i5.5267

Abstract

Frequency Modulated Continuous Wave (FMCW) LiDAR merupakan teknologi pendeteksian objek dengan teknik memodulasi frekuensi sinar laser secara kontinu. FMCW LiDAR memiliki kelebihan dalam mendeteksi objek karena dapat menghasilkan pendeteksian objek secara akurat. Salah satu paramater yang berperan dalam pendeteksian sistem ini adalah optical power. Namun optical power dapat berkurang karena ketidaksesauian kombinasi fiber doped amplifier dengan panjang gelombang laser sehingga pada penelitian ini dilakukan pengukuran optical power secara simulasi terhadap berbagai jenis fiber doped amplifier dan panjang gelombang laser. Hasil penelitian menunjukan bahwa jenis Holmium Doped Fiber Amplifier (HDFA) mengeluarkan optical power yang lebih besar dibandingkan jenis fiber doped amplifier lainnya, yakni sebesar 20,02 mW. Selain itu, panjang gelombang 1550 nm menghasilkan keluaran optical power yang optimal diberbagai jenis fiber doped amplifier. Pada penelitian ini semua jenis fiber doped amplifier dan panjang gelombang laser menghasilkan frekuensi beat sebesar 20 MHz dan objek terdeteksi pada jarak 100 meter.
Pemberdayaan Masyarakat Melalui Eco-Enzyme untuk Pengelolaan dan Degradasi Limbah Cair Industri Tempe di Desa Sukorejo Trenggalek Firdaus, Rohim Aminullah; Rahmawati, Endah; Dzulkiflih, Dzulkiflih; Khoiro, Muhimmatul; Putri, Nugrahani Primary; Yantidewi, Meta
Lumbung Inovasi: Jurnal Pengabdian kepada Masyarakat Vol. 10 No. 4 (2025): December
Publisher : Lembaga Penelitian dan Pemberdayaan Masyarakat (LITPAM)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36312/6eyqtz37

Abstract

Limbah cair industri tempe memiliki beban organik tinggi (COD, BOD, TSS) yang berpotensi menurunkan kualitas lingkungan jika dibuang tanpa pengolahan. Sebagian besar pelaku UMKM tempe di pedesaan belum memiliki akses terhadap teknologi pengolahan yang murah dan sederhana, sehingga diperlukan pendekatan alternatif berbasis partisipasi masyarakat. Kegiatan Pengabdian kepada Masyarakat (PKM) ini bertujuan memberdayakan warga Desa Sukorejo, Trenggalek dalam pengelolaan limbah cair menggunakan eco-enzyme hasil fermentasi sampah organik rumah tangga. Berbeda dari pendekatan konvensional, kegiatan ini menerapkan model partisipatif dengan pembuatan dan penerapan eco-enzyme berbasis rumah tangga yang terintegrasi dengan monitoring masyarakat, sebuah pendekatan yang belum umum diterapkan pada pengelolaan limbah tempe skala kecil. Metode meliputi pemetaan pelaku usaha, sosialisasi, pelatihan pembuatan eco-enzyme (rasio 3:1:10; fermentasi ±90 hari), penyusunan SOP aplikasi (1–5% v/v), dan pendampingan uji sederhana (pH, bau, kekeruhan). Program diikuti 18 peserta dan menghasilkan kelompok pengelola serta unit percontohan. Observasi menunjukkan penurunan bau dan kekeruhan dalam 24–48 jam serta peningkatan pengetahuan peserta. Evaluasi respon peserta menunjukkan kategori sangat baik (rata-rata >90%). Kegiatan ini efektif meningkatkan kapasitas masyarakat dan menunjukkan potensi eco-enzyme sebagai solusi awal pengolahan limbah cair tempe yang murah dan berkelanjutan. Community Empowerment Through Eco-Enzymes for the Management and Degradation of Liquid Waste from Tempeh Industries in Sukorejo Village, Trenggalek Abstract Liquid waste from tempeh production contains high organic loads (COD, BOD, TSS) that can degrade environmental quality if discharged without proper treatment. Most small-scale tempeh producers in rural areas lack access to simple and low-cost treatment technologies, necessitating an alternative approach grounded in community participation. This Community Service Program (PKM) aims to empower residents of Sukorejo Village, Trenggalek in managing liquid waste using eco-enzymes produced from the fermentation of household organic waste. Unlike conventional approaches, this program adopts a participatory model involving the household-based production and application of eco-enzymes integrated with community monitoring—an approach that is rarely implemented for small-scale tempeh wastewater management. The methods included stakeholder mapping, awareness-building activities, training on eco-enzyme production (3:1:10 ratio; ± 90-day fermentation), preparation of application SOPs (1–5% v/v), and facilitation of simple testing (pH, odor, turbidity). The program involved 18 participants and resulted in the formation of a management group and a pilot demonstration unit. Observations indicated reductions in odor and turbidity within 24–48 hours, alongside improved participant knowledge. Participant response evaluations showed excellent results (average >90%). This program effectively enhanced community capacity and demonstrated the potential of eco-enzymes as a low-cost and sustainable preliminary solution for treating liquid waste from tempeh production.
Three-Dimensional Soliton Propagation in Ruby for High-Stability Optical Communication Yantidewi, Meta; Firdaus, Rohim Aminullah; Khoiro, Muhimmatul; Winarno, Nanang; Ramadani, Riski; Nikmah, Afiyah; Alhusni, Hanan Zaki
POSITRON Vol 16, No 1 (2026): Vol. 16 No. 1 Edition
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Univetsitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/positron.v16i1.93213

Abstract

Optical communication in digitalisation is a significant catalyst in supporting high-speed and large capacity data transmission. However, optical communication applications face substantial challenges, such as energy loss, dispersion effects, and signal stability over long transmission distances. One material that has the potential to overcome these problems is ruby due to its nonlinear characteristics. This research work numerically investigates soliton propagation in ruby material analysis as a Nonlinear Schrödinger Equation numerical modelling and three-dimensional visualisation with Cubic B-Spline, modified Korteweg-de Vries-Zakharov-Kuznetsov, and Boussinesq methods to understand ruby material characteristics more deeply. The simulations show that the soliton waveform remains stable during propagation, with its amplitude confined within approximately -1.05 to 0.35, indicating robust shape preservation under anisotropy and temperature variations. like most previous studies that are limited to one or two dimensional modelling or to dispersive fibre media, this study implement a full 3D NLSE framework tailored to the physical properties of ruby. The results show that both numerical modelling and three-dimensional visualisation indicate that ruby material can maintain the soliton waveform during propagation. This finding suggests that ruby has the potential to be applied in optical communication systems with high stability to support long-distance data transmission.
Co-Authors Achmad Samsudin Adella Juniar Safitri Afifah, Ratih Mega Ayu Afiyah Nikmah Al-Hilalliyah, Shafiyyah Alhusni, Hanan Zaki Anes Liovi Putri Tse, Bertina Annastasya, Fira Maya Briantoko, Elang Rimba Rimba Damopolii, Insar DZULKIFLIH Dzulkiflih, Dzulkiflih Dzulkiflih, FNU Endah Rahmawati Endah Rahmawati Eny Latifah, Eny Fadhilah, Nisa'ul Febriani, Cornelia Khoiro, Muhimmatul Kurniawan, Ananda Rossy Lathifah Dika Mauludi Lilit Rusyati Lutfi Rohman Masulah, Bidayatul Meta Yantidewi Muhimmatul Khoiro Mustikasari, Vita Ria Mutmainnah Mutmainnah Nanang Winarno Nikmah, Afiyah Nugrahani Primary Putri Nugrahani Primary Putri NUR OCTAVINA, CHOIRINA RACHMA Prasetyo, Dhenatra Rifqy Rahastama, Swastya Ramadani, Riski Riski Ramadani Safina Ayu Damayanti Saputra, Winata Tegar Sihombing, Rizky Agassy Syauqi, Salma Kaisan Ula, Rini Khamimatul Yantidewi, Meta Yohanes Dwi Saputra, Yohanes Dwi