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Journal of Experimental and Applied Physics
Published by Universitas Negeri Padang
ISSN : 29880378     EISSN : 29879256     DOI : -
Core Subject : Science, Engineering,
Control & Systems Engineering Electrical & Electronics Engineering Materials Science & Nanotechnology Physics
Journal of Experimental and Applied Physics: an international peer-reviewed open-access journal dedicated to interchange for the results of high-quality research in all aspects of theoretical physics, applied physics, electronics and instrumentation, material physics, biophyiscs, geophysics, high energy physics and computational physics.
Arjuna Subject : Fisika dan Astronomi - Instrumentasi
Articles 81 Documents
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Analysis of the Influence Mass Variations of Banana STEM Fibres with Polypropylene (PP) Matrix on Accoustic and Porosity Properties Viera Alvio Santika; Yenni Darvina; Ratnawulan Ratnawulan; Fadhila Ulfa Jhora
Journal of Experimental and Applied Physics Vol 2 No 2 (2024): June Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v2i2.54

Abstract

Noise pollution is sound that you do not want to hear or is known as noise. If people hears loud noises continuously, it can disrupt hearing function. Therefore, it is necessary to have noise control by making an acoustic material that will be coated on the room's walls. A cheap and environmentally friendly alternative material is using banana stem waste from the fibre taken and with polypropylene as a fibre binder. This research aims to determine the effect of variations in the mass composition of banana stem fibre with the matrix polypropylene on the value of the acoustic properties and porosity, and determine the relationship between porosity with acoustic properties. Characteristics of the acoustics that will be measured are sound absorption coefficient, sound reflection coefficient, and transmission loss. The method used is using a characterizaton tool with one microphone impedance tube and porosity test tool with a digital scale. Acoustic material is made by varying the mass percentage in the ratio of polypropylene and midrib fibre banana, namely 90%:10%; 85%:15%; 80%:20%; 75%:25%; and 70%:30%. Based on the research results, it is known that the more fibre composition in the composite, the sound absorption coefficient values, transmission loss values, and porosity values were higher produced, but the resulting sound reflection coefficient value was lower. Then, the relationship between porosity with acoustic properties was that the higher porosity value, the resulting sound absorption coefficient and transmission loss value are higher too. However, the resulting sound reflection coefficient value was getting lower.
Design and Construction of A 3-Dimensional Vibration Measurment Tool Using Accelerometer Sensors Based On The IoT For Implementations of Building Structures Totop Gabe; Yulkifli Yulkifli; Yohandri Yohandri; Suaidi Ahadi
Journal of Experimental and Applied Physics Vol 2 No 2 (2024): June Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v2i2.55

Abstract

The building structure plays a crucial role in distributing the loads exerted by the building onto the ground, ensuring its strength to prevent collapse or damage. A common form of building damage is cracking due to vibrations. These vibrations can originate from both inside and outside the building, often at low frequencies. To address this, a vibration measuring instrument needs to be designed using a 3-Dimensional Accelerometer sensor to facilitate easier detection and data acquisition, thereby minimizing errors in measuring low vibrations caused by human activities that impact the durability of building structures. The research focuses on developing a tool to measure 3-dimensional vibrations in buildings using an Internet of Things (IoT)-based accelerometer sensor. This engineering research aims to design a 3-dimensional vibration measuring instrument. The resulting design includes performance specifications and system design specifications. The system's performance specifications cover the electronic circuit of the tool and the design of the measurement value monitoring display. The system employs the MPU6050 sensor to measure vibrations, with Arduino Uno as the main microcontroller and NodeMCU ESP32 for transmitting measurement data from Arduino to the web server. Experimental tests were conducted to measure vibration frequency by repeatedly dropping a 100-gram load from a height of 70 cm onto a wooden table. The load was dropped 10 times, maintaining a 2 cm distance from the coordinates of the measuring device. The experiments provided real-time measurement results, showing varying frequencies each second. The device successfully detected very low vibrations, with a minimum recorded frequency of 11.26 mHz and a peak of 93.18 mHz in the sixth experiment. The varying results across experiments were influenced by factors such as measurement sensitivity, filtering, sampling frequency, calibration, data processing, and noise minimization. The analysis confirmed that the tool could detect vibrations every second with high sensitivity, making it suitable for real-time detection of various low-frequency vibrations under consistent load conditions
Comparison of Power Absorption Effectiveness of Dynamic Solar Panels and Static Solar Panels at an Angle of 15° Wulan Aulia Fauzi; Mairizwan Mairizwan; Yulkifli Yulkifli
Journal of Experimental and Applied Physics Vol 2 No 2 (2024): June Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v2i2.56

Abstract

This study aims to determine the performance specifications and design of the measurement system so that it can measure the effectiveness of the two panel systems. The performance specifications of this system use 2 20Wp solar panels for both systems, namely static solar panels and dynamic systems, namely dual-axis solar trackers. Voltage and current measurements use INA219 sensors and are displayed and stored using a serial Bluetooth terminal as a data logger. Design specifications for The results of this linearity test show very satisfactory results in terms of measurements on voltage and current parameters, namely the R-Square value, which reaches 1 and 0.99. The accuracy of the INA219 sensor is 97.78% for voltage and 96.21% for current. The precision of the INA219 sensor for voltage is 100% and 91% for current. Based on these data, it can be said that this tool works well. The measurement results of the increase in solar panel power absorption are compared between the static solar panel system at an angle of 15 ° to the north and the dynamic solar panel system with the dua- axis solar tracker method. The power generated by the static solar panel system is 3229.81 watts, and the power generated by the dual-axis solar tracker system is 3865.92 watts, with a percentage increase in power of 19.7%. It can be concluded that the dual-axis solar tracker system is more efficient in generating power compared to static systems.
Structure Analysis Of Fe3O4-Graphene Oxide Nanocomposite From Corn Cob Waste Ismira Ismira; Rahmat Hidayat; Ratnawulan Ratnawulan; Riri Jonuarti
Journal of Experimental and Applied Physics Vol 2 No 2 (2024): June Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v2i2.59

Abstract

This research is a study of the structure of nanocomposites whose composition is varied between Fe3O4 and Graphene Oxide. The purpose of this study is to determine the structure of Fe3O4-Graphene Oxide nanocomposites from corn cob waste. This type of research is experimental research, which begins with sample preparation from corn cob waste, carbon activation, graphene oxide synthesis, sonication and neutralization of graphene oxide, and synthesis of Fe3O4-Graphene Oxide nanocomposites using the ball milling method by varying the composition. Crystal size and structure were characterized by XRD, functional groups were characterized by FTIR, surface morphology, particle size and porosity were characterized by SEM. The results of the research on the structure of Fe3O4-Graphene Oxide nanocomposites from corn cob waste, obtained XRD results show that the crystal structure is Hexagonal, Cubic, and Orthorhombic with the average crystal size of the best Fe3O4-Graphene Oxide composition variation at 30%: 70% composition, because the particle size produced is quite small from other composition variations, namely 39.19 nm. FTIR results show that all compositional variation comparisons have C-H, O-H, C≡C, C=O, C=C, C-O, and Fe-O bond functional groups. SEM results show the morphology of Fe3O4 is spherical, while the morphology of graphene oxide is in the form of chunks. The particle size value gets smaller as the Fe3O4 composition increases, because the more Fe3O4 composition causes the surface of the graphene oxide particles covered to get bigger. In addition, particle size can also affect the porosity of nanocomposites, the smaller particle size can increase porosity because more particles can occupy space.
Effect of The Camposition Nanocomposite Fe3O4-Graphene Oxide on Optical Properties Synthesized from Coconut Shell Charcoal Sri Angraini; Gusnedi Gusnedi; Riri Jonuarti; Fadhila Ulfa Jhora
Journal of Experimental and Applied Physics Vol 2 No 2 (2024): June Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v2i2.60

Abstract

This study aims to determine the effect of Fe3O4 nanocomposite composition: Graphene Oxide on the optical properties of Fe3O4 Graphene Oxide nanocomposite by obtaining the results of absorbance value, transmittance, reflectance, and band gap value based on UV-Vis test. Graphene oxide used in this study is made from biomass waste coconut shell charcoal which contains carbon elements, most of whose pores are still covered by hydrocarbons and other organic compounds and the charcoal is used as activated carbon through an activation process, then synthesized using the modified hummers method. In this study, three variations were used, namely 20%: 80%; 30%; 70%; 40%: The results show that the effect of Fe3O4-Graphene Oxide Nanocomposite Composition on coconut shell waste using a UV-Vis spectrometer, the absorbance value of each sample was obtained in the range of 200-290 nm.. In the results of gap energy research with 3 variations respectively 3.269 eV, 3.79 eV, 3.91 eV obtained that if the variation of graphene oxide is higher than the value of the energy gap produced is smaller, so the addition of graphene oxide from coconut shell waste has the effect of reducing the energy gap of graphene oxide.
Carbonization Time Optimization In The Preparation Of Coconut Pulp Based Activated Carbon For Thermoelectric Materials Nanda Febrian; Yenni Darvina; Ramli Ramli; Rahmat Hidayat
Journal of Experimental and Applied Physics Vol 2 No 2 (2024): June Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v2i2.61

Abstract

In this study utilizing coconut pulp as an ingredient in making activated carbon for thermoelectric materials From the research that has been done, it is not yet known the best carbonization time on coconut pulp activated carbon for thermoelectric materials. Therefore, this study aims to determine the optimization of carbonization time on coconut pulp activated carbon for thermoelectric materials. The coconut pulp was dried using an oven at 105ºC and then carbonized using a furnace. Carbonization time variations used were 10 minutes, 15 minutes, and 20 minutes with temperature variations from previous research, namely 300ºC. Then the results of carbonization were mashed using a mortar and pestle and filtered using a 120 mesh sieve. Carbon was activated with 0.5 M HCl (1:10) as much as 25 grams for 24 hours. After activation, the carbon was filtered, washed with distilled water and dried using an oven. Then the coconut pulp activated carbon was characterized by testing water content, vapor content, ash content, and bound carbon content. The test results show that based on SNI 06-3730-1995 the lowest water content is at 10 minutes carbonization time which is 1.72%, the lowest steam content is at 10 minutes carbonization time which is 8.54%, the lowest ash content is at 20 minutes carbonization time which is 0.55%, and the highest bound carbon content is at 10 minutes carbonization time which is 90.65%. The results showed that the optimization of carbonization time on coconut pulp activated carbon for thermoelectric materials was 10 minutes.
Design of a modeling tool for wheel connected with a belt using speed and time control for video tracker analysis Reza Novita Sari; Asrizal Asrizal; Harman Amir; Mairizwan Mairizwan
Journal of Experimental and Applied Physics Vol 2 No 3 (2024): September Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v2i3.63

Abstract

The influence of the advances of science produces technological innovations that leverage on education, economics, social and self-development. In education, design of laboratory experimental modeling tools continues to be carried out by researchers to improve learning effectiveness. Wheel movement experiments related to belts include one of physic learning activities. The parameter measured from the creation of modeling tool is the wheel speed and analysis of wheel motion related to the belt. The system can be controlled in speed and time using Blynk application. Video recordings are used as circular motion analysis material on Tracker applications. The design of system is a box size 35 cm in length, 20 cm in width and 18 in height consisting of one switch, LCD, and two wheels connected by a belt. Wheel 1 has a diameter of 15 cm and wheel 2 is 10 cm. Based on data analysis, the results of physical parameters were obtained with high accuracy and precision values using standard measuring instruments, namely tachometers, calculation of the theoretical formula. The system's precision was 98.84% and speed accuracy for 30 rpm, 50 rpm and 80 rpm were 99.3%, 99.19% and 99.93%. Frequency values increased according to the increase in input speed and compared to the reverse period.  The angle speed will increase as the wheel spokes become smaller. So, the wheel modeling tool related to the belt using speed and time control with the Blynk application as well as the Tracker video alysis can work effectively and validly.
Design and Build an Automatic Feeding System for Catfish Farming based-on Internet of Things (IoT) Mukhlis Surito Fajri; Asrizal Asrizal; Harman Amir; Mairizwan Mairizwan
Journal of Experimental and Applied Physics Vol 2 No 4 (2024): December Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v2i4.64

Abstract

Fish farming represents a sector aimed at boosting the national economy. The Ministry of Marine Affairs and Fisheries has prioritized programs to support the growth of catfish farming.. However, there are still obstacles experienced by cultivators such as irregularities in feeding time and uneven distribution of feed. Therefore, a solution is needed in the form of designing an efficient system in providing fish feed. The system is developed using ESP32 microcontroller, servo motor, stepper motor, loadcell, and connected to the website for remote control. The system utilizes a motor, load cell, and is integrated with a website for remote operation. This research employs an engineering approach, focusing on system design and testing. The findings indicate that the system achieves an average feed weight measurement accuracy of 98.31%, demonstrating reliable performance in both laboratory and field-scale tests. This system is expected to increase efficiency, practicality, and effectiveness in catfish farming, as well as providing real-time information about feed and feeding schedules.
Effect of Calcination Temperature of SiO2-TiO2 Composite XRD Characterization of Crystal Size Structure and Phase Sri Fany Mulya Putri; Ratnawulan Ratnawulan; Gusnedi Gusnedi; Riri Jonuarti
Journal of Experimental and Applied Physics Vol 2 No 3 (2024): September Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v2i3.65

Abstract

Calcination is often used to activate beneficial metal oxidation in catalysts and improve material stability. In the metal oxidation research used is SiO2-TiO2 nanocomposite because it has advantages over photocatalysts and thermal stability. One important factor that affects is the particle size and crystal phase formed during the calcination process at various temperatures. The purpose of the study was to determine the effect of calcination on changes in phase and crystal structure in SiO2-TiO2 nanocomposites. The material used for the manufacture of nanocomposites is natural silica source from coconut fiber which is burned into white ash. The ash was extracted for the preparation of silica sol by adding Tetraethyl Orthosilicate (TEOS) as a precursor synthesized by the sol gel method then, calcination was carried out with temperature variations of 700 , 800 , and 900 . After calcination, XRD characterization was carried out to obtain crystal sizes of 63.48 nm, 66.87 nm, and 73.83 nm. The phase formed is dominant in TiO2 is rutile and SiO2 is quartz and cristobalite.
The Effect Of Composition Variation On The Functional Groups Of Coconut Husk Ash Silica Nanocomposites With Titanium Dioxide Mardiana Mardiana; Ratnawulan Ratnawulan
Journal of Experimental and Applied Physics Vol 2 No 3 (2024): September Edition
Publisher : Department of Physics, Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/jeap.v2i3.66

Abstract

Studie has been performed with the title Effect of Composition Versions on Useful Corporations of Coconut Coir Ash Silica Nanocomposites with Titanium Dioxide. This study goals to determine the traits of silica gel from the processing of coconut husk ash thermodiffcation TiO2 in phrases of useful groups variations in silica composition with titanium dioxide, particularly 3.5: 1.5 and 4: 1 (grams). The synthesis of silica gel from coconut husk ash become finished the use of the gel sol method. FTIR (Fourier Transform Infrared) characterization effects show the achievement of TiO2 changed silica gel and silica gel synthesis proven with the aid of the absorption of Si-O-Si and Si-OH in silica gel and Ti-O-Ti absorption in TiO2 changed silica gel. Based on the FTIR spectrum, it was obtained that during all samples an ordinary practical group of TiO2 seemed, specifically Ti-O at an absorption peak of about 500-600 cm-1 O-H vibrational bond stretching and O-H bending at an absorption height of 1500 - 3500 cm-1 Appeared in all samples indicating the presence of water molecules. In addition, Ti-O-Si vibrational bonding at absorption peaks of 700 - 1000 cm-1 regarded on all samples indicating the archiement of the composite synthesis method TiO2 - SiO2.

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