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Pillar of Physics: Jurnal Berkala Ilmiah Fisika
Published by Universitas Negeri Padang
ISSN : 23379030     EISSN : 26852608     DOI : http://dx.doi.org/10.24036/10741171074
Core Subject : Science,
Earth & Planetary Sciences Materials Science & Nanotechnology Physics
This journal publishes original articles on the latest issues and trends occurring internationally in: 1 Geophysics, 2 Electronics and Instrumentation, 3 Material Physics, (4) Computational Physics. Other topics are related to physics are most welcome.
Arjuna Subject : Fisika dan Astronomi - Fisika dan Astronomi (Lain-Lain)
Articles 16 Documents
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Search results for , issue "Vol 12, No 2 (2019)" : 16 Documents clear
Pengaruh variasi komposisi MnFe2O4 terhadap sifat magnetik nanokomposit MnFe2O4/PANi yang disintesis dengan metoda sol – gel spin coating (MnFe2O4 composition influence on the magnetic properties of MnFe2O4 / PANi nanocomposites synthesized by the sol-gel spin coating method) Zhafrandy Eka Senida; - Ramli; - Ratnawulan; - Hidayati
PILLAR OF PHYSICS Vol 12, No 2 (2019)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (558.024 KB) | DOI: 10.24036/7535171074

Abstract

Currently theeprogressoof material nanocomposite can be applied for some of electronic device, bio medic, and electronic engineering. This is because nanocomposite has multifunction of magnetic properties. Most of device use nanoparticles was made from ferrite material, such as MnFe2O4 with high electrical performance, high magnetic permeability. And as matrix used PANi with good thermal stability and high conductivity. With this advantages, synthesis both material can be applied for electronic device like magnetic sensor. Synthesis MnFe2O4/PANi nanocomposite material with 30%, 40%, 50%, 60%, and 70% composition variation of MnFe2O4 with Sol-Gel method has been success. MnFe2O4/PANi nanocomposite was prepared by make of Fe2O3 precursor, make MnFe2O4 and PANi solution with sol-gel method, make MnFe2O4/PANi nanocomposite with spin coating, heating, and sintering the nanocomposite. This nanocomposite characterized with XRD, FTIR, and VSM. Magnetic properties nanocomposite were measured withaa Vibrating Sample Magnetometer (VSM). Result of VSM shows value of coercivity (Hc), remanence magnetization (Mr) and saturation magnetization (Ms). Highest value offcoercivity shows in 60% composition variation with score 389,99Oe, from the value of coercivity, we can classified this nanocomposite as a hard magnet. And for the value of saturation magnetization is 1,07 memu and remanence magnetization is 0,35 memu. The applied field of nanocomposite shows in loop hysteresis with range -10000≤ H ≤10000, it show the ferromagnetic behavior. Ferromagnetic is one of material properties which needed for magnetic sensor. So can be concluded that MnFe2O4/PANi nanocomposite can be applied for magnetic sensor.
Rancang bangun sistem pengontrolan pH larutan untuk budidaya tanaman hidroponik berbasis internet of things (Solution pH control system fabrication design for the cultivation of hydroponic plants based on the internet of things) Vines Ayudyana; - Asrizal
PILLAR OF PHYSICS Vol 12, No 2 (2019)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (392.995 KB) | DOI: 10.24036/7464171074

Abstract

Hydroponic plant cultivation is a method of agriculture for saving land. Hydroponic plants have special needs that have to be monitored every day. One of the special needs that is not considered in hydroponic plants is the pH level in the nutrient solution. The pH value needed for each plant is different. The importance of the pH value is controlled because pH is a factor in the ability of plants to absorb nutrients in solution. The solution to this problem is to design a pH control system for hydroponic plants based internet of things. The control system has the aim to stabilize the pH level of nutrients automatically and the measurement can be monitored remotely. This type of research is engineering research. The procedures of engineering research were explaining the ideas that were made, designing the conceptual control system, explaining the arrangement functions, designing in detail, making a prototype, and testing the prototype. Data collection techniques are done directly and indirectly. Direct measurement was related to measuring the output voltage and pH of an acid or base solution. Indirectly measurement related to determining the accuracy and precision of the instrument controlling the pH of the solution. Data analysis technique was used tables and data plots in graphical form. Based on data analysis there are five research results. First, performance specifications consisting of a pH sensor and its converter, automatic valves and electronic circuits namely NodeMCU and relays. Second, the addition of acid solution decreases the pH value and the output voltage. Third, the addition of a base solution increases the pH value and the output voltage. Fourth, the accuracy and presicion in laboratory scale test of the pH control system are in the 99.80% and 99.90% for acid solutions while in the basic solutions 98.26% and 98.34%. Fifth, in the field test results that the control instrument has high accuracy with a pH stability that is 6.016 until 6.982.
Pengaruh suhu sintering terhadap sifat penyerap gelombang mikro dari nanokomposit CoFe2O4/PVDF yang di preparasi dengan metode sol-gel (Sintering temperature effect on the microwave-absorbing properties of the CoFe2O4 / PVDF nanocomposites prepared by the sol-gel method) Yona Sri Mantia; - Ramli; Yenni Darvina; - Desnita
PILLAR OF PHYSICS Vol 12, No 2 (2019)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (875.402 KB) | DOI: 10.24036/6915171074

Abstract

This number applications of microwaves are numerous so that it produces microwaves that emit. If it is not in control, there will be interference with electromagnetic signals. This also causes disruption of the working system of the Neighborhood. CoFe2O4/PVDF nanocomposite synthesized by the sol-gel method for microwave preparation was completed. Making materials to absorb microwaves uses five variations of sintering temperature, namely 250℃, 280℃, 350℃, 400℃, and 450℃. The sintering process is carried out using a furnace. The presence of a single phase on CoFe2O4/PVDF nanocomposite was characterized using X-Ray Difraction (XRD), to see the functional groups using Fourier Transform Infrared (FTIR), and to help wave use carried out using Vector Network Analyzer (VNA). This study discusses the sintering of microwave absorbers.The characterization results using VNA get a maximum Reflection Loss value of -29,7051 dB at a temperature of 400℃, frequency of 11.76 GHz, with absoption coefficient 96%. Different sintering temperatures produce a large amount of different absorptions. Nanocomposite which has a large value of reflection loss does not necessarily have a large answering tape width. The quality of materials that are good for microwave absorbers must also consider the value of the width of the capture band.The best absorption occurs at a temperature of 450 ℃ because have a maximum  reflection loss value -21.116 dB, frequency of 6.00 GHz, absorption band widht  0.54 GHz, and absoption coefficient 91%.
Rancang bangun alat ukur jumlah tetes dan volume sisa cairan infus dengan warning system pada sistem monitoring cairan infus berbasis arduino (Measuring device for the number of drops fabrication design and the volume of remaining infusion fluids with a warning system in the Arduino-based infusion fluid monitoring system) Auliya Sifa Fauziyyah; - Yohandri
PILLAR OF PHYSICS Vol 12, No 2 (2019)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (444.029 KB) | DOI: 10.24036/7531171074

Abstract

Intravenous Fluids Drops are very important for the process of healing or treatment for patients. The function of infusion is to replace the loss of fluids or nutrients in the body. In Indonesia, monitoring system of condition about infusion is still done manually, but for the cases such a large hospitals which is the number of patients is not balanced by medical personnel, it is becomes ineffective so that it can cause mistakes in monitoring. A very serious mistake can occur are too late in replacing the infusion. The solution to solve this problem is to make an automatic infusion monitoring system with an alarm warning. This research is eksperimental research. The measurement technique taken is direct and indirect measurement. Direct measurement data is mass of infusion and indirect measurment data is the number of infusion drops and the percentage of infusion volume. The purpose of this research is to determine the design spesifications and peformance spesification of the instrument. The sensor used to measure infusion drops per minute is photogate and to measure the infusion volume is load cell. Motor Servo Tower Pro SG90 are used as automatic drip control and arduino mega used as a brain for this instrument. The display is use TFT LCD and using buzzer for alarm warning. The accuracy of infusion drops per minute system is 0,97 with error 1,25% and accuracy of infusion volume is 0,978 with error 1,944%.
Pengembangan tool pemodelan eksperimen gerak melingkar beraturan dengan pengontrolan laju motor DC berbantukan analisis video tracker (Development of experimental modeling tools for regular circular motion with DC motor speed control assisted by video tracker analysis) Cici Putri; - Asrizal
PILLAR OF PHYSICS Vol 12, No 2 (2019)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (557.848 KB) | DOI: 10.24036/7441171074

Abstract

The development of technology and information can provide influence on the progress of Science and Technology. Improved science is supported by the role of media and digital technology. Physics is one of the sciences relating to experimental activities. One of interesting is the phenomenon of uniform circular motion. Based on observations were known that the experimental activities use manual tool that have limitations in displaying measurement data. This problem can be solved by modeling tool with video tracker analysis. The purposes of the research were to determine the performance specifications of the uniform circular motion experiment modeling tool, determine the accuracy and precition of controlling the DC motor speed, determine the accuracy and precition of the uniform circular motion modeling tool, determine the parameters of physics and their influences on the experiment of uniform circular motion. This research method was called research and development which is a research method used to validate and develop products. Based the research can describe four results. The first, performance specification consisted of a uniform circular motion modeling tool of 20x20x10 cm by controlling the speed of a DC motor. Second, the accuracy and precition of controlling the DC motor speed with values of 98.85% and 98.54%. Third, the accuracy and precition of the uniform circular motion modeling tool with an accuracy value of 98.67% and precition value of 97.70%. Fourth, the frequency and angular velocity will be greater by using a higher speed value. However, the period value decreases as the speed increases. The influence of physics parameters is done by using variations in speed and radius. Speed is inversely proportional to period. However, speed is directly proportional to frequency and angular velocity. The effect of the radius variation is the centripetal acceleration is directly proportional to the radius
Pengaruh suhu sintering pada penyerapan gelombang mikro nanokomposit NiFe2O 4 / PVDF untuk material penyerap radar (Sintering temperature effect on microwave absorption of NiFe2O4 / PVDF nanocomposite for radar-absorbent materials) Moulia Fadhilah; - Ramli; - Gusnedi; - Yohandri
PILLAR OF PHYSICS Vol 12, No 2 (2019)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (602.338 KB) | DOI: 10.24036/6914171074

Abstract

Synthesis ofoNiFe2O4/PVDF nanocomposite with sintering temperature variations of 2500C, 280, 3000C, 3500C, 4500C has been done with the solgel method for microwave absorbing material (RAM).This material is to reduce reflections or absorb microwaves, so objects coated with RAM are not detected by Radio Detection and Ranging (RADAR). In making nanocomposite NiFe2O4 / PVDF, it includes the making of Fe3O4 precursor solution using iron sand, making NiFe2O4 solution, making NiFe2O4 / PVDF nanocomposite, printing, and  sintering. The samples were characterized by XRD. FTIR and VNA. For the analysis of microwave absorption ability as measured by the Vector Network Analyzerr(VNA), and then maximum Reflection Loss (RL) number was obtained at theesintering temperature of 2800C at -27.5767 dB at aafrequency off11.20 GHz which the X-Band region with microwaveeabsorption in coefficient amounting to 0.0417989142. Nanocomposite NiFe2O4 / PVDF can absorb microwaves ~ 96% at a frequency of 11.20 GHz. So, NiFe2O4/PVDF nanocomposite is suitable for Absorbing Radar Material

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