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All Journal POSITRON Jurnal Fisika Unand Jurnal Pengabdian UntukMu NegeRI JOIV : International Journal on Informatics Visualization Emerging Science Journal Journal of Physics: Theories and Applications Jurnal Penelitian Pendidikan IPA (JPPIPA) Communications in Science and Technology Jurnal Hilirisasi IPTEKS (JHI) Jurnal Ilmu Fisika MONSU'ANI TANO Jurnal Pengabdian Masyarakat BERNAS: Jurnal Pengabdian Kepada Masyarakat Warta Pengabdian Andalas: Jurnal Ilmiah Pengembangan Dan Penerapan Ipteks Indonesian Journal of Community Empowerment and Service
Muldarisnur, Mulda
Universitas Andalas
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Applications of Fiber Optic Sensor for Monitoring and Early Warning of Soil Shift on IoT based System Herlin, Helmi Septaria; Harmadi, -; Febrielviyanti, -; Muldarisnur, -
JOIV : International Journal on Informatics Visualization Vol 4, No 3 (2020)
Publisher : Society of Visual Informatics

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62527/joiv.4.3.219

Abstract

A fiber optic sensor system has been designed to monitor ground shift using a multimode FD-620-10 step index fiber optic cable equipped with an IoT-based data transmission system. The sensor system consists of a light source in the form of a diode laser, a fiber optic cable light wave guide, and an OPT101 photodetector. Data processing is done using the Arduino Uno R3 microcontroller and data transmission to the server using the Arduino Ethernet Shield. Localhost is a webserver that displays measurement data and sends e-mail early warning notification of ground shift hazards. Optical fiber is used to measure the value of ground displacement by utilizing changes in output voltage. The change in output voltage occurs due to variations in the change in the diameter of the optical fiber arch. The results of sensor testing obtained an average measurement error of 1.53%.
Monitoring system ammonia concentration using fiber optic sensor based surface plasmon resonance Huda, Erin Ficrah; Harmadi, Harmadi; Muldarisnur, Muldarisnur
Journal of Physics: Theories and Applications Vol 7, No 2 (2023): Journal of Physics: Theories and Applications
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jphystheor-appl.v7i2.78897

Abstract

A monitoring system for ammonia concentration in waters has been created using fiber optic sensors based on surface plasmon resonance (SPR). Monitoring is carried out to measure the decline in water quality due to the toxic compound ammonia from floating net cages (KJA) activities used as aquaculture sites. The sensor performance was improved by replacing the cladding using gold nanoparticles to increase the sensitivity of the fiber optic sensor based on the SPR phenomenon. The sensor consists of a laser diode as a light source, optical fiber as a waveguide and OPT101 as a photodetector. The Arduino Nano microcontroller is used as a data processor, LoRa as a transmission system and the MCU node as a data receiver. The results of measuring the ammonia concentration received by the MCU node are displayed on a Google spreadsheet in real time. Testing of measuring instruments is carried out by comparing the measurement results with a UV-Vis spectrophotometer. The test results obtained an accuracy value of 94.09% for optical fibers using the dip coating method and 78% for optical fibers using the thermal evaporation coating method.
Penerapan Sistem Monitoring Suhu dan Kelembaban Ruangan Berbasis IoT untuk Optimalisasi Pengujian Di Laboratorium Riset UPT Laboratorium Sentral Universitas Andalas Akmecia Risqa Apriani; Taufik Try Margani; Mulda Muldarisnur
Jurnal Fisika Unand Vol 15 No 1 (2026)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.15.1.41-48.2026

Abstract

The quality of laboratory test results is strongly influenced by temperature and humidity conditions, therefore monitoring these parameters is essential to ensure compliance with ISO/IEC 17025:2017 standards. This study aims to develop an Internet of Things (IoT)-based temperature and humidity monitoring system accessible via the Adafruit IO platform. The system is designed using a DHT22 sensor for temperature and humidity detection, with data processing carried out by the ESP32 microcontroller, which transmits the information in realtime to Adafruit IO. The experimental results indicate that the system performs reliably in recording laboratory room conditions, with an average measurement error of 1.873% for temperature and 3.743% for humidity, while the overall accuracy reached 98,127% for temperature and 96,257% for humidity. furthermore, the ESP32 successfully transmitted data to the Adafruit IO dashboard and activated the LED and buzzer as warning indicators when the measured values exceeded the predefined thresholds.
Peningkatan Absorpsi Cahaya pada Nanostruktur TiO₂ Terdoping Cu dan Ni untuk Aplikasi Pemisahan Air Fotokatalitik Noni Novianti; Fransischa Ramona; Diana Vanda Wellia; Mulda Muldarisnur
Jurnal Fisika Unand Vol 14 No 6 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.6.635-643.2025

Abstract

This study reports the enhancement of light absorption by TiO₂ nanoparticles when doped with Ni and Cu nanoparticles. Numerical simulations were performed using the boundary element method. The absorbance in the visible region of Ni-doped TiO₂ increases compared to pure TiO₂. The increase in absorbance is accompanied by a shift in the absorption band edge to a longer wavelength (redshift) due to the formation of new energy levels that narrow the band gap. Cu-doped TiO₂ exhibits a more significant increase in absorbance and a wider absorption range. Both dopants decrease the band gap relative to pure TiO₂, with Cu doping producing a greater decrease. Ni and Cu doping enhance the optical response of TiO₂ in the visible region. Cu doping has the most dominant effect in broadening the absorption and lowering the band gap energy. These findings indicate that Ni- and Cu-based dopant engineering is a potential approach to improve the performance of TiO₂-based materials in photocatalytic applications such as hydrogen production by water splitting.
Optimalisasi Potensi Limbah Alat Gelas sebagai Adsorben Limbah Logam Berat Fe, Cd, Pb dan Mn Skala Laboratorium Melisa Weno Gusthia; Fatiyah Aghni Yati Nurmi; Sefina Rahmatunisa; Mulda Muldarisnur
Jurnal Fisika Unand Vol 15 No 2 (2026)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.15.2.125-131.2026

Abstract

Chemical laboratory activities produce liquid waste containing hazardous materials, including heavy metals such as Fe, Cd, Pb, and Mn, which have the potential to pollute the environment if not managed properly. This study aims to optimize the use of laboratory glassware waste as an environmentally friendly alternative adsorbent to reduce heavy metal levels in laboratory-scale liquid waste. The research stages include collecting glassware waste from various laboratories, grinding, sieving, and activating the adsorbent through chemical treatment (HNO₃ and HCl-HNO₃), drying, calcination, and adding NaOH to open the adsorbent pores. Material characterization was carried out using SEM, FTIR, and BET to observe the morphology and surface area of the pores. Initial results showed that the three-stage activation was able to improve the quality of the adsorbent pores so that it was ready for use in the adsorption process. In the next stage, heavy metal adsorption tests were carried out with variations in time and mass of the adsorbent, then analyzed using Flame AAS and re-characterized with SEM-EDX, FTIR, and BET. The results using FTIR can be proven that the adsorbent contains SiO2 compounds that have the potential to have pores due to the structure of the compound. The results of the BET characterization obtained a surface area value of 0, which proves that the adsorbent has a very small pore size, also called micropores. The results of Flame AAS measurements show that the adsorbent is able to adsorb heavy metals with an adsorption percentage above 85%.
SOSIALISASI DAN PEMETAAN POTENSI TANAH LONGSOR MENGGUNAKAN METODE MIKROSEISMIK DAN GEOLISTRIK DI KAWASAN OBJEK WISATA BUKIT NOBITA Marzuki Marzuki; Mutya Vonnisa; Ahmad Fauzi Pohan; Arif Budiman; Imam Taufiq; Trengginas Eka Putra Sutantyo; Elistia Liza Namigo; Dian Milvita; Alimin Mahyudin; Nini Firmawati; Muldarisnur Muldarisnur; Afdal Afdal; Dahyunir Dahlan; M. Ali Shafii; Afdhal Muttaqin; Rico Adrial; Dedi Mardiansyah; Harmadi Harmadi; Zulfi Zulfi; Geby Sri Ayu Oktavia; Fani Anjelina; Nurul Annisa
Jurnal Hilirisasi IPTEKS Vol. 6 No. 2 (2023)
Publisher : LPPM Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jhi.v6i2.655

Abstract

Nobita Hill is one of the areas being developed as a tourist attraction in the city of Padang. Above Nobita Hill is a beautiful view, and you can see the picture of Padang City. However, the hilly topography with steep slopes makes this area prone to landslides. This activity aims to map the potential for landslides on Novita Hill. Activities start from preparation, implementation in the field, and evaluation. Field activities are carried out in two stages. The first stage is an experiment to map the landslide potential. The second stage is socialization. The target audience for this activity is the Village Head of Jua Nan XX Village and its officials and the community around Nobita Hill. The results of the study and mapping were disseminated to the village administration and community leaders involved in the development of the Bukit Nobita tourism area, which was carried out on November 16, 2022. The result of tourist objects often changes land use and cover. However, mitigation of the potential for landslides in this area has never been done. Therefore, the Andalas University Physics Department team mapped the potential for landslides on Novita Hill for six months, using microseismic and geoelectric methods. This activity obtained a map of the distribution of dominant frequencies, a map of the distribution of amplification, and an identification of slip planes concerning the potential for landslides on Nobita Hill. Furthermore, the results of the mapping and mitigation efforts have been disseminated to the village administration and community leaders involved in the development of the Bukit Nobita tourism area. This activity was carried out well. The landslide potential distribution map obtained from this activity is input for the community and stakeholders in developing the Buki Nobita tourist attraction that is safe from disasters.
Pengaruh Ukuran Dimer Nanopartikel Bola Emas, Perak, dan Aluminium yang Ditambahkan pada Lapisan Back Surface terhadap Efisiensi Sel Surya CIGS Abi Syaibah; Mulda Muldarisnur
Jurnal Fisika Unand Vol 13 No 6 (2024)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.13.6.843-849.2024

Abstract

This research aims to determine the effect of the size and material of spherical nanoparticle dimers placed on the back surface layer of CIGS solar cells on the resulting current density. This research was conducted computationally using the finite difference time domain (FDTD) method. Three materials were studied: silver, gold, and aluminium. For each material, nanoparticle diameter was varied. The calculation results show that the short circuit current density (Jsc) increases with the nanoparticle diameter. Silver nanoparticle dimers showed the highest increase in Jsc. A sphere diameter of 60 nm produces the highest Jsc. The increase in the Jsc of CIGS solar cells is due to the back reflection of light into the active layer of solar cells by nanoparticles and the near field excitation around nanoparticle dimers. The significant increase in Jsc shows the potential for utilizing silver nanoparticle dimers to increase the efficiency of CIGS solar cells.
Pengaruh Geometri dan Polarisasi Cahaya terhadap Resonansi Plasmon Nanopartikel Ellipsoid Core-Shell SiO₂@Ag dan SiO₂@Au Noni Novianti; Abi Syaibah; Ikhwan Fikri Maulidan; Mulda Muldarisnur
Jurnal Fisika Unand Vol 14 No 4 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.4.379-386.2025

Abstract

This study reports the optical behaviors of SiO₂@Ag and SiO₂@Au core-shell ellipsoidal nanoparticles in terms of polarization of light and geometrical parameter changes. The particles showed two strong modes of resonances, longitudinal and transversal, which could be controlled by rotating the polarization of incident light by 90° and thus could find applications as sensor and optical switch devices. While the resonant wavelength is independent of polarization direction, while maximum extinction values indicate pronounced changes. SiO₂@Ag nanoparticle exhibit higher maximum extinction as well as the peak of resonance at a shorter wavelength than SiO₂@Au. Furthermore, an increase in the ratio of core diameter to shell induces a blue-shift and increasing extinction value. The overall particle size has no influence on the location of the peak of the resonance but increases the extinction intensity. The larger ratio of short axis to long axis also brings about blue-shift in longitudinal resonances. The finding demonstrates that core-shell structure control and morphology control can be used to engineer nanoparticle optical performance in diverse nanophotonic applications.
Co-Authors Abi Syaibah Adine Melossa Famia Adrial, Rico Afdal Afdal Afdal Afdal Afdal, Afdal Afdhal Muttaqin Afdhal Muttaqin Afrineldi, Rendi Afza, Vikra Yudha Yolanda Ahmad Fauzi Pohan Akmecia Risqa Apriani Akrajas Ali Umar Aldilla, Muhammad Syaugi Alimin Mahyudin Amrullah, Yasir Anak Agung Istri Sri Wiadnyani Andini Ramadhani Anggini, Aulia Anla, Anla Fet Hardi Ardhiati, Fitria Ardian Putra Arif Budiman Astuti Astuti Aulia Anggini Betta Centaury Cecep Irwanda Cen Rahman Dahyunir Dahlan Dahyunir, Dahyunir Damayanti, Elok Dedi Mardiansyah Dian Fitriyani Dian Milvita Disti Nabila Suci Dunnas, Irsya Dwi Pujiastuti Dwi Puryanti Ebriyen Zeni Eldiani Arifya Elistia Liza Namigo, Elistia Elvaswer Elvaswer Exaudi Pratama Rajagukguk Exaudi Pratama Rajagukguk F Marlow Fadilla Monica Fahendri Fahendri Fahendri, F. Famia, Adine Melossa Fani Anjelina Fani Anjelina Fatiyah Aghni Yati Nurmi Faula Rahmi Febrielviyanti, - Feriska Handayani Irka, Feriska Handayani Fitria Ardhiati Fransischa Ramona Geby Sri Ayu Oktavia Geby Sri Ayu Oktavia Haiqal, Helmi Harmadi Harmadi Helmi Haiqal Helmi Septaria Herlin Huda, Erin Ficrah Ikhwan Fikri Maulidan Ilham Perdana Ilham Perdana Ilham Perdana AT Imam Taufiq Imam Taufiq Imam Taufiq Irsya Dunnas Irwanda, Cecep Kurniawan, Rengga Adit Lubis, Muhammad Siddiq Ilyas M. Ali Shafii M. Ali Shafii Mahardhika, Muhammad Khaishar Marzuki Marzuki Marzuki Marzuki Melisa Weno Gusthia Meqorry Yusfi Mieke Wulandari Mora Mora Muftahul Rizka Muhammad Khaishar Mahardhika Muhammad Siddiq Ilyas Lubis Muhammad Syaugi Aldilla Mutya Vonnisa Nasution, Widi Mulia Nini Firmawati Nola Fridayanti Nola Fridayanti Nola Fridayanti, Nola Noni Novianti Novia Dwi Agusri Novirza, Resti Nurul Annisa Nurul Annisa Perdana AT, Ilham Rahma Fikri Nuradi Rahmad Rasyid Rahman, Cen Rahmawati Yusri Rahmi Suryani Rahmi, Faula Rajagukguk, Exaudi Pratama Ramacos Fardela Ramadhani, Andini Rani Delvihardini Rendi Afrineldi Rengga Adit Kurniawan Resti Novirza Ridwan, Jaenudin Rifa Lihayati Rizchi Aulia Utami Rizka, Muftahul Sadikin, Siti Naqiyah Salamah, Ummi Salim Muhaimin Sefina Rahmatunisa Septriani, Yulni Sri Handani Sri Oktamuliani Sri Rahayu SRI RAHAYU Suci, Disti Nabila Sucy Lestari Wirma Suryani, Rahmi Syukri - Syukri Syukri Taufik Try Margani Trengginas Eka Putra Sutantyo Ummi Salamah Usna, Sri Rahayu Alfitri Utami, Rizchi Aulia Vikra Yudha Yolanda Afza Wellia, Diana Vanda Widi Mulia Nasution Widi Mulia Nasution Wildian Wildian Wulandari, Mieke Yoci Darwita Putri Yuli Yetri Yulia Eka Putri, Yulia Eka Yulni Septriani Yusri, Rahmawati Zeni, Ebriyen Zulfi Zulfi Abdullah Zulfi Zulfi Zulfi Zulfi Zulfi Zulfi Zulfi Zulfi