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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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Rancang Bangun Alat Ukur Jarak Tempuh Lompat Jauh Menggunakan Sensor HC-SR04 dengan Output Website: Kata Kunci: Jarak, NodeMCU, HC-SR04, Limit Switch Febriani, Cornelia; Firdaus, Rohim Aminullah; Dzulkiflih, FNU
Inovasi Fisika Indonesia Vol. 12 No. 3 (2023): Vol 12 No 3
Publisher : Prodi Fisika FMIPA Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ifi.v12n3.p113-121

Abstract

Pengukuran lompat jauh menggunakan metode manual kurang praktis digunakan. Penelitian ini bertujuan untuk merancang alat ukur jarak horizontal lompat jauh menggunakan HC-SR04 dengan hasil ukur yang dapat disimpan secara otomatis di website. Penyimpanan otomatis dimaksudkan agar pengukur tidak perlu mencatat satu per satu hasil ukur jarak lompatan di Microsoft Excel. Peneliti juga menambahkan micro switch pada rancangan alat untuk mendeteksi sah atau tidaknya suatu lompatan. Alat ini dilengkapi dengan rancangan limit switch sebagai pendeteksi sah atau tidaknya suatu lompatan. Cara kerja pada micro switch yaitu arus listrik terhubung apabila micro switch tertekan sehingga buzzer berbunyi. Sedangkan arus listrik terputus apabila micro switch tidak tertekan sehingga buzzer tidak berbunyi. Apabila buzzer berbunyi, maka lompatan dianggap tidak sah. Pengujian alat ukur dilakukan di Lapangan Atletik Universitas Negeri Surabaya dengan sampel 30 siswa SMP. Sinyal analog pengukuran jarak dibaca oleh NodeMCU, selanjutnya NodeMCU mengelola hasil ukur sehingga dapat ditampilkan dan disimpan di website. Hasil ukur jarak lompat jauh menggunakan HC-SR04 dibandingkan dengan hasil ukur menggunakan meteran. Hasil dari penelitian ini yaitu rancangan alat ukur jarak lompat jauh berhasil dibuat dengan akurasi pengukuran sebesar 99,88 % dan hasil ukur dapat di simpan secara otomatis. Selain itu, limit switch dapat diimplementasikan untuk mendeteksi sah atau tidaknya suatu lompatan. Kata Kunci: Jarak, NodeMCU, HC-SR04, Limit Switch Abstract Long jump measurements using manual methods are less practical to use. This study aims to design a long jump horizontal distance measuring instrument using HC-SR04 with measuring results that can be saved automatically on the website. Autosave is intended so that the meter does not need to record one by one the results of measuring the jump distance in Microsoft Excel. Researchers also added a micro switch to the design of the tool to detect whether or not a jump is legitimate. This tool is equipped with a limit switch design as a detection of whether or not a jump is valid. The way the micro switch works is that the electric current is connected when the micro switch is depressed so that the buzzer sounds. While the electric current is cut off if the micro switch is not depressed so that the buzzer does not sound. If the buzzer sounds, the jump is considered invalid. Testing of measuring instruments was carried out at the Surabaya State University Athletic Field with a sample of 30 junior high school students. The analog signal of distance measurement is read by NodeMCU, then NodeMCU manages the measurement results so that they can be displayed and stored on the website. The results of measuring long jump distances using HC-SR04 are compared to the measuring results using a meter. The result of this study is that the design of the long jump distance measuring instrument was successfully made with a measurement accuracy of 99.88% and the measuring results can be saved automatically. In addition, limit switches can be implemented to detect whether or not a jump is legitimate. Keywords:Distance, NodeMCU, HC-SR04, Limit Switch
PENGARUH VARIASI DAYA DAN LAMA PAPARAN IRRADIASI LASER DIODE TERHADAP PEFORMA PERTUMBUHAN CASSAVA: Kata Kunci: Cassava, Fotobiostimulasi, Laser Dioda, Manihot Esculenta Prasetyo, Dhenatra Rifqy; Putri, Nugrahani Primary; Firdaus, Rohim Aminullah; Ula, Rini Khamimatul
Inovasi Fisika Indonesia Vol. 13 No. 1 (2024): Vol 13 No 1
Publisher : Prodi Fisika FMIPA Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ifi.v13n1.p1-6

Abstract

Irradiasi laser adalah teknologi yang inovatif dan dapat diterapkan dalam bidang bioteknologi. Dengan menggunakan sinar laser yang terfokus, intens dan pada paparan waktu tertentu, teknologi ini memungkinkan dapat menstimulasi perkembangan dan pertumbuhan dari tanaman. Penelitian ini bertujuan untuk menganalisis hasil dan mendeskripsikan hasil dari pengaruh irradiasi laser terhadap pertumbuhan. Irradiasi laser diberikan kepada sampel dengan variasi daya 1mW, 4mW, 6mW, dan 10mW, serta lama waktu paparan 30s, 40s, 50s, 60s, 70s, 80s, dan 90s. Hasil peforma pertumbuhan Cassava pada sampel D1T70 menunjukkan hasil yang cukup signifikan dibandingkan dengan kontrol yang ada, dengan menunjukkan tinggi batang akhir 65mm pada periode tanam selama 1 bulan. Kata Kunci: Cassava, Fotobiostimulasi, Laser Dioda, Manihot Esculenta Abstract Laser irradiation is an innovative technology and can be applied in the field of biotechnology. By using laser beams that are focused, intense and at a certain time exposure, this technology makes it possible to stimulate the development and growth of plants. This study aims to analyze the results and describe the results of the effect of laser irradiation on growth. Laser irradiation was given to samples with various power of 1mW, 4mW, 6mW, and 10mW, and exposure times of 30s, 40s, 50s, 60s, 70s, 80s, and 90s. The results of Cassava growth performance in the D1T70 sample showed significant results compared to the existing control, showing a final stem height of 65mm in a planting period of 1 month. Keywords: Cassava, Photobiostimulation, Laser Diode, Manihot Esculenta
DESAIN ANTENA MIKROSTRIP DENGAN T-SHAPE BENTUK SLOT PADA JARINGAN SELULAR 5G: DESAIN ANTENA MIKROSTRIP DENGAN T-SHAPE BENTUK SLOT PADA JARINGAN SELULAR 5G Briantoko, Elang Rimba Rimba; Firdaus, Rohim Aminullah; Dzulkiflih, Dzulkiflih; Khoiro, Muhimmatul; Winarno, Nanang
Inovasi Fisika Indonesia Vol. 13 No. 2 (2024): Vol 13 No 2
Publisher : Prodi Fisika FMIPA Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ifi.v13n2.p51-58

Abstract

Abstrak Artikel penelitian ini membahas tentang antena patch mikrostrip yang dibuat untuk komunikasi nirkabel. Bahan substrat yang digunakan yaitu FR-4 (lossy) dengan permitivitas dielektrik 4,3. Antena ini dirancang dengan menggunakan software CST Studio Suite. Tiga desain antena patch mikrostrip yang ukurannya kecil, mudah difabrikasi, dan biaya yang murah telah dianalisis dalam artikel ini. Dari ketiga antena yang diusulkan memiliki return loss -41,39 dB, -43,78 dB, dan -44,37 dB dengan bandwidth sebesar 2,078663 GHz, 1,986553 GHz, dan 2,082676 GHz pada return loss dibawah -10 dB. Direktivitas yang diperoleh sebesar 2,37 dBi, 2,88 dBi, dan 2,88 dBi. Antena ini dapat diaplikasikan pada sistem radar, ponsel, dan aplikasi LAN nirkabel. Kata Kunci: FR-4, Return loss, Bandwidth, Direktivitas Abstract This research article discusses a microstrip patch antenna that was made for wireless communication. The substrate material used is FR-4 (lossy) with a dielectric permittivity of 4.3. This antenna was designed using using CST Studio Suite software. Three microstrip patch antenna designs that are small size, easy to fabricate, and low cost have been analyzed in this article. this article. The three proposed antennas have return loss of -41.39 dB, -43.78 dB, and -44.37 dB with bandwidths of 2.078663 GHz, 1.986553 GHz, and 2.082676 GHz at return loss below -10 dB. The directivity obtained is 2.37 dBi, 2.88 dBi, and 2.88 dBi. This antenna can be applied to radar systems, cell phone, and wireless LAN applications. Keywords: FR-4, Return loss, Bandwidth, Directivity
KARAKTERISTIK SENSOR FIBER OPTIK KONFIGURASI SPIRAL DALAM MENDETEKSI KADMIUM PADA AIR: Kata Kunci: Sensor Fiber Optik, Spiral, Kadmium Fadhilah, Nisa'ul; Yantidewi, Meta; Khoiro, Muhimmatul; Firdaus, Rohim Aminullah
Inovasi Fisika Indonesia Vol. 13 No. 3 (2024): Vol 13 No 3
Publisher : Prodi Fisika FMIPA Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/ifi.v13n3.p103-108

Abstract

AbstrakKadmium (Cd) adalah logam berat yang sulit terurai dan berpotensi menyebabkan efek toksik padalingkungan, kesehatan manusia, dan hewan sehingga Menteri Kesehatan Republik Indonesia menetapkanbatas maksimum kadar yang diperbolehkan dalam air minum yaitu 0,003 mg/L. Penelitian ini bertujuanuntuk mengembangkan sensor berbasis fiber optik untuk mendeteksi ion kadmium dalam air denganmemanfaatkan gelombang evanescent menggunakan konfigurasi spiral. Sensor ini dirancang untukmemberikan data pengujian secara real-time dan meningkatkan karakteristik sensor untuk pengujian kualitasair. Hasil penelitian menunjukkan bahwa semakin tinggi konsentrasi Cd maka intensitas cahaya menjadisemakin berkurang yang ditandai dengan penurunan nilai dB. Sensor fiber optik konfigurasi spiral denganjumlah lilitan yang lebih banyak menunjukkan karakteristik sensor yang lebih baik. Sensor dengan 3 lilitanmenunjukkan hasil pengukuran terbaik dengan jangkauan kerja 4,86 dB, sensitivitas 99,21 dB/ppm, danresolusi 1,01 x 10-4 ppm.Kata Kunci: Sensor Fiber Optik, Spiral, Kadmium AbstractCadmium (Cd) is a heavy metal that is difficult to decompose and has the potential to cause toxic effects on theenvironment, human health, and animals. Therefore, the Indonesian Minister of Health has set the maximum permissible concentration in drinking water at 0.003 mg/L. This study aims to develop a optical fiber-based sensor to detect cadmium ions in water using evanescent wave technology with a spiral configuration. The sensor is designed to provide real-time testing data and improve sensor characteristics for water quality testing. The results indicate that higher concentrations of Cd lead to a decrease in light intensity, marked by a reduction in dB values. The spiral optical fiber sensor with a greater number of windings demonstrates superior sensor characteristics. The sensor with 3 windings shows the best measurement results with a working range of 4.86 dB, sensitivity of 99.21 dB/ppm, and resolution of 1.01 x 10-4 ppm.Keywords: Fiber Optic Sensor, Spiral, Cadmium
ANALYZING ATTITUDES TOWARDS SCIENCE AND RELIGION BETWEEN NATIONAL AND ISLAMIC SCHOOLS IN INDONESIA: A CASE STUDY Saputra, Winata Tegar; Winarno, Nanang; Rusyati, Lilit; Firdaus, Rohim Aminullah; Mustikasari, Vita Ria
JOURNAL OF SCIENCE EDUCATION AND PRACTICE Vol 8, No 1 (2024): June 2024
Publisher : Universitas Pakuan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33751/jsep.v8i1.9762

Abstract

Given that Muslims make up the majority in Indonesia, students' perspectives on science are influenced by their religious beliefs. This research aims to analyze the differences in attitudes toward science and religion between national and Islamic schools. This study employed a survey method to look at the views of students in national and Islamic schools. Two groups comprise the 420 Indonesian secondary school students that comprise the research sample: 212 students from national schools and 208 from the renowned "Pesantren" Islamic school in Kota Bandung, West Jawa. The result of this study shows factors with significant differences in general aspects between national school with 3.5 and islamic school with 3.8. The aspect that show significant differences are competitiveness, critical thinking, religiosity, trust in scientists, interest in doing science, extrinsic motivation for science, general value of science, awareness of environmental issues, science self-concept, science removing the need for God, compatibility between science and religion, and perceptions of science lessons. Factors with no significant differences include attitudes toward theistic faith, creationism, the public value of science, and scientism. Additionally, there are some strengths and weaknesses between the national school and Islamic school, such as the time of the science lessons, lab equipment, internet access, etc. It could be concluded that national school and islamic school has strengths and weaknesses that related with science and religion. 
Effect of Heat Leakage on Relativistic Quantum Lenoir Engine Performance with a Massless Boson as Working Substance in the Infinite Potential Box Saputra, Yohanes Dwi; Rahastama, Swastya; Firdaus, Rohim Aminullah
POSITRON Vol 14, No 1 (2024): Vol. 14 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.v14i1.64658

Abstract

A study on the effect of heat leakage on power output, thermal efficiency, and reversibility rate in a relativistic quantum Lenoir engine has been conducted. Initially, we analogize the quantum working substance of the engine, a massless boson trapped in an infinite potential box with a movable right wall, as an ideal gas confined in a pistoned cylinder. Then, the total work, heat input, and heat output of each engine cycle which consists of isochoric, adiabatic expansion, and isobaric compression are extracted by applying the concept of quantum thermodynamics. Finally, power output, thermal efficiency, and reversibility rate of the engine are calculated for different variations of the heat leakage constant. The results are the relationship between several parameters which are expressed in the graph of thermal efficiency vs. compression ratio, graph of efficiency/normal efficiency vs. compression ratio, power output vs. efficiency, and reversibility rate vs. compression ratio. The conclusion is that an increase in heat leakage has an effect on reducing the efficiency and reversibility rate of the engine but does not affect its power output. This work will provide a new chapter for further research related to the use of the boson particle as a working substance in the quantum heat engine, especially the study of the heat leakage effect on engine performance.
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.
Optimalisasi Sensor (SPR) Surface Plasmon Resonance dengan Lapisan Emas dan Perak untuk Deteksi Logam Berat: Optimization of Surface Plasmon Resonance Sensor with Gold and Silver Coating for Heavy Metal Detection Lathifah Dika Mauludi; Meta Yantidewi; Firdaus, Rohim Aminullah
Jurnal Kolaboratif Sains Vol. 7 No. 7: July 2024
Publisher : Universitas Muhammadiyah Palu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56338/jks.v7i7.5545

Abstract

Penelitian ini mengukur efektivitas lapisan logam berat dengan menggunakan emas (Au) dan perak (Ag) sebagai sensor SPR (Surface Plasmon Resonance). Hasil menunjukkan bahwa perak lebih sensitif dibandingkan emas dalam mendeteksi logam berat (Fe, Pb, Hg) karena interaksi plasmoniknya yang lebih kuat. Emas memiliki stabilitas kimia dan bioaktivitas yang baik, sementara perak menunjukkan sensitivitas dan akurasi lebih tinggi tetapi rentan terhadap oksidasi. Sensor berbasis perak menunjukkan sensitivitas, akurasi deteksi, dan figure of merit (FoM) yang lebih baik dibandingkan sensor berbasis emas, meskipun memerlukan perlindungan tambahan terhadap oksidasi. Kinerja optimal sensor terjadi pada panjang gelombang tertentu (emas pada 650 nm dan perak pada 500 nm), membatasi fleksibilitas dalam aplikasi yang memerlukan panjang gelombang berbeda.
Simulation of Quantum Tunnelling in Semiconductors: Analysis of Barrier Thickness Variation through the High Order FDTD Method Firdaus, Rohim Aminullah; Kurniawan, Ananda Rossy; Latifah, Eny; Saputra, Yohanes Dwi; Masulah, Bidayatul; Winarno, Nanang
POSITRON Vol 14, No 2 (2024): Vol. 14 No. 2 Edition
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Univetsitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/positron.v14i2.82415

Abstract

The time-dependent Schrödinger equation is fundamental to quantum mechanics, describing the temporal evolution of quantum systems. This research presents a High-Order Finite-Difference Time-Domain (HO-FDTD) method, employing Taylor series expansion to solve the equation with enhanced efficiency and accuracy. By advancing beyond traditional methods like first-order Taylor series (Crank-Nicolson, forward or backward Euler) or computationally intensive Runge-Kutta schemes, the HO-FDTD method leverages higher-order Taylor expansion for the time evolution operator while simultaneously refining the Laplacian operator. This dual improvement enhances precision, allowing for accurate modeling of complex quantum phenomena. Focusing on quantum tunneling, a critical process where electrons traverse potential barriers despite insufficient classical energy, the study examines tunneling probabilities and electron behavior across barriers of varying thickness in semiconductors. The simulations reveal that thicker barriers reduce tunneling probabilities, amplify deviations in electron positions, and indicate energy transfer during interactions, with increased resistance lowering kinetic energy and raising potential energy. These findings emphasize the significant influence of barrier thickness on quantum tunneling and highlight the HO-FDTD method"™s capability to capture intricate quantum dynamics, establishing it as a robust tool for advancing research and applications in quantum mechanics.
Antena Mikrostrip Double E-Shaped dengan Frekuensi 3,3 GHz untuk Aplikasi WiMax MUTMAINNAH, MUTMAINNAH; NUR OCTAVINA, CHOIRINA RACHMA; ROHMAN, LUTFI; FIRDAUS, ROHIM AMINULLAH
ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika Vol 10, No 3: Published July 2022
Publisher : Institut Teknologi Nasional, Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26760/elkomika.v10i3.555

Abstract

ABSTRAKAntena mikrostrip double E-shaped untuk aplikasi WiMax melalui proses simulasi dan fabrikasi telah berhasil dirancang. Perancangan desain antena mikrostrip ini menggunakan bahan substrat FR-4 lossy dengan ketebalan 1,6 mm dan konstanta dielektrik 4,6. Dimensi substrat yang dirancang yaitu 45 mm x 52 mm x 1,6 mm. Hasil simulasi yang diperoleh yaitu antena mikrostrip bekerja di frekuensi 3,3 GHz, return loss -21 dB, VSWR 1,23, bandwidth 342 MHz, dan gain sebesar 3,5 dBi. Hasil pengukuran diperoleh antena mikrostrip bekerja di frekuensi 3,35 GHz, return Loss -22 dB, VSWR 1,26, bandwidth 265 MHz, dan gain sebesar 3,2 dBi. Baik hasil simulasi dan pengukuran pola radiasi yang dihasilkan membentuk pola bidirectional. Antena mikrostrip ini dapat diaplikasikan pada frekuensi Wimax.Kata kunci: Antena Mikrostrip, Double E-shaped, Frekuensi 3,3 GHz, WiMax, Return Loss ABSTRACTThe double E-shaped microstrip antenna for WiMax application through simulation and fabrication process has been successfully designed. The design of this microstrip antenna using a lossy FR-4 substrate material with a thickness of 1.6 mm and a dielectric constant of 4.6. The dimensions of the designed substrate are 45 mm x 52 mm x 1.6 mm. The simulation results obtained that microstrip antenna works at a frequency of 3.3 GHz, return loss -21 dB, VSWR 1.23, bandwidth 342 MHz, and gain of 3.5 dBi. The measurement results obtained that the microstrip antenna works at a frequency of 3.35 GHz, return loss of -22 dB, VSWR of 1.26, bandwidth of 265 MHz, and gain of 3.2 dBi. Both the simulation results and the resulting radiation pattern measurements form abidirectional pattern. This microstrip antenna can be applied at WiMax frequency. Keywords: Microstrip Antenna, Double E-shaped, Frequency 3.3 GHz, WiMax, Return Loss
Co-Authors Achmad Samsudin Adella Juniar Safitri Afifah, Ratih Mega Ayu Afiyah Nikmah Al-Hilalliyah, Shafiyyah 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