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Pillar of Physics: Jurnal Berkala Ilmiah Fisika

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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 10 Documents

Search results for , issue "Vol 13, No 2 (2020)" : 10 Documents clear

Use of TCS3200 sensor to identify heavy metal materials Kelvin Septa Dewantara; - Yulkifli
PILLAR OF PHYSICS Vol 13, No 2 (2020)
Publisher : Department of Physics – Universitas Negeri Padang UNP

v>Heavy metals are natural components that are toxic and can endanger living things even in a very smallconcentration. Water that is polluted by heavy metals in a certain concentration can harm the ecosystem andcan be fatal if entered the human organ system. The principle of heavy metal concentration measurement usingthe TCS3200 sensor is a sensor will sense the color gradation from dissolved heavy metal. This color gradationwill be calibrated to a concentration of dissolved heavy metals. Heavy metal material that is used for thisresearch were FeCl3, NiSO4, and CuSO4. Based on the analysis results, there were 4 results obtained. The firstone was performance specification from this instrument consists of a TCS3200 sensor, black acrylic box for thesensor placement. In the black acrylic box, there was a hole sample for sample placement. The second result wasthe effect of changing in heavy metal concentration to sensors output data is proportional. The third result wasan instrument calibrating with existing data. The fourth result was accuracy and precision from the instrumentwhich have been calibrated. For FeCl3 material, the average accuracy was 95.5% and precision was 98.7%.For NiSO4, the average accuracy was 96% and precision was 98.3%. For CuSO4 material, the averageaccuracy was 99.7% and precision was 99.8%.

Easy monitoring and data record system of electric current detected by ACS712 affordable non-destructive electrical current sensor Mona Berlian Sari; Lia Yuliantini; Hafizh Prihtiadi; Mitra Djamal
PILLAR OF PHYSICS Vol 13, No 2 (2020)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Monitoring and data record system of electric current on the current conducting wire has been developed. Recently, the current measurement was conducted by electronic circuit configuration by adding the shunt resistance in the circuit configuration. Compare to the voltage measurement, the electric current measurement has several obstacle and sometimes dangerous, especially on the AC current measurement. This study offers the automation of electric current measurement using affordable and non-destructive ACS712 Hall effect sensor. Hall effect is the phenomena of charge flow deflection in the metal plate that is placed in the magnetic field. By using this sensor, it is possible to detect the AC and DC current on conducting wires. The output of the sensor voltage will be change based on the magnetic field obtained due to current flows in the wire. Those output voltage are processed in microprocessor of ATMEGA238. Measurement results are saved in *.txt format. LabVIEW is used as the display system interface to simplify the utilization. The measurement is conducted in the Faraday cage. This system can be one of answer for the efficient and stable affordable current measurement with the precision is 0.9954 and average of accuracy percentage is 99.5934%. To reach those precision, the sensor calibration formula in datasheets should be corrected by subtracts the sensor calibration formula with the constant of 0.125.

Magnetoresistance characterization of nanocomposite Fe3O4 / PPy that synthesized with sol-gel spin coating method Surya Pertiwi; - Ramli
PILLAR OF PHYSICS Vol 13, No 2 (2020)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Indonesia is a rich country that has various natural resources, one of which is in the form of mining materials such as iron sand which contains a lot of magnetite (Fe3O4). Magnetite (Fe3O4) has superior properties compared to others so that magnetite (Fe3O4) is a top priority in research activities that are rapidly developing in world research. Polypyrrole (PPy) is a conductive polymer which has several advantages. Fe3O4 nanoparticles are a type of magnetic material that has considerable potential in GMR magnetic sensor applications. The aim of this research is to synthesize and characterize the effect of Fe3O4 composition on the magnetoresistance properties of Fe3O4/PPy nanocomposites synthesized by the Sol Gel spin coating method. In this study, several stages were carried out, namely: the sample preparation stage, the nanocomposite manufacturing stage, the characterization stage and the data analysis. Fe3O4/PPy thin layer nanocomposite is made from iron sand that has been purified and milled by previous researchers. Fe3O4/PPy nanocomposites were prepared using the sol-gel method with a variation of Fe3O4/PPy concentrations of 30%, 40%, 50%, 60% and 70% and then grown using the spin coating method with a rotating speed of 3000 rpm for 60 seconds, the thin layer formed was dried using a furnace at 5500C for 1 hour. Then the thin layer was characterized using XRF, FTIR, SEM and FPP. Based on all the characterizations that have been obtained, a thin layer of nanocomposite has been successfully grown on glass preparations. Fe3O4/PPy nanocomposite thin layer is a thin layer that has good magnetoresistance properties, this is shown in the results of testing the magnetoresistance properties using the Four Point Probe (FPP) method.

Development of a dip coating tool for thin layer growers based on the Raspberry Pi 3 Inandita Mardhiyah; - Yohandri
PILLAR OF PHYSICS Vol 13, No 2 (2020)
Publisher : Department of Physics – Universitas Negeri Padang UNP

v>Low cost and precise is a concern in developing instruments for thin-film manufacturing. In this paper, alow-cost dip-coating instrument based on Raspberry pi will be presented. In this work, Raspberry Pi 3 wasadopted as a microcontroller for digital data processing. In addition, this tool is also equipped with a user-friendly interface system that is easy to operate by the user. An addition, the Python programming language is also adopted in the development of programming on the Raspberry Pi 3. Furthermore, the Raspberry Pi is alsoneeded to build an interface on the tool with the Qt designer framework. The results of device configurationssuch as withdraw speed and immersion time can be stored in the data logger system that has been developed inthis equipment. The performance and characteristics of the equipment have been tested and produce excellentcharacteristics and performance that meet the criteria for the production of thin film. Based on the results, a dipcoating based on Raspberry pi can be applied to the production of thin film in nanomaterial technology.

The effect of composition of NiFe2O4 on the crystal structure of nanocomposite NiFe2O4 / PVDF that synthesized using sol gel spin coating method Yessy Arinda Putri; - Ramli
PILLAR OF PHYSICS Vol 13, No 2 (2020)
Publisher : Department of Physics – Universitas Negeri Padang UNP

NiFe2O4 is a Ferrite Compound with the molecular formula MFe where M is a transition metal or alkaline earth is a magnetic semiconductor material with a spinel structure. The polymer used in this study is Polyvinilidene Flouride (PVDF). PVDF film is a material that is inexpensive, lightweight, flexible, has a wide frequency range, and is very sensitive. In this study 5 compositions were carried out namely ((50% : 50%), (33,3% : 66,6%), (25% : 75%), (75% : 25%), (66,6% : 33,3%)). Nanocomposites are synthesized using the sol-gel spin coating method. With making precursors (Fe(NO3) 3.9H2O and Ni(NO3) 2.6H2O. For the growth of thin films, the solution is dripped on a 0.5 cm x 0.5 cm glass substrate. Characterized using XRD (X-Rey Diffraction), SEM (Scanning Electron Microscope), FTIR (Fourier Transform Infra Red). Keywords : NiFe2O4,PVDF,Nanokompocite, Sol Gel, and Spin Coating

Experiment modeling tool development wheels related to the control advance for video tracker analysis - Harviyani; - Asrizal
PILLAR OF PHYSICS Vol 13, No 2 (2020)
Publisher : Department of Physics – Universitas Negeri Padang UNP

The concepts explained by Physics can be the basis for the development of new disciplines. Theory explains the results of experiments carried out and subsequent experiments.Observations prove that experiments using manual tools still have many shortcomings . Physics parameters that can be displayed are still a bit of a weakness.This problem can be overcome by modeling tools that analyzed the video using a tracker.This study aims to determine the accuracy, accuracy, and resolution of controlling the speed of a DC motor, determine the performance specifications of the related wheel experimental model modelingtool, determine the accuracy and accuracy of the related wheel circular motion modeling tool, determine the physical magnitude and influence of each of the wheel relations of the modeling tool. This research is classified into laboratory experiment research method. Laboratory experiments are researches that apply science into a design to get performance as expected. Direct measurement is done by varying the speed and type of wheel connection. Indirect measurements are carried out analysis using a tracker software with the resulting data is linear velocity and angular velocity. Data analysis carried out revealed four research results. The performance specifications which consist of a circular motion modeling tool related to the length of 35 cm, width 5 cm and height 20 cm by controlling, average value of accuracy and accuracy of DC motor rate control are 99.06% and 99.55%, respectively. Accuracy value for linear velocity is 99.35%, accuracy at angular velocity is 99.63%, and the accuracy value of each relationship is> 95%. Tangent wheel has the same linear velocity value, different angular velocity , and opposite wheel rotation direction . Centralized wheels have different linear speeds, angular speed and direction of wheel rotation are the same. The wheels connected by ropes have the same linear velocity and direction of rotation of the wheels, different angular velocity values.

Analysis of Ground Shear Strain (GSS) district Kawalu Tasikmalaya with HVSR method using microtremor data Muhammad Reza Iswara; - Syafriani; Thomas Hardy
PILLAR OF PHYSICS Vol 13, No 2 (2020)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Tasikmalaya is one of the areas affected by the earthquake. One of efforts to reduce the impact of the earthquake is by analyzing seismic hazard levels as one of the earthquake disaster mitigation efforst with the microtremor method. It can determine the amplification value and the dominan frequency. From the dominant frequency value and amplification can be calculated. Seismic vulnerabilities index (Kg) and value of Ground Shear Strain (GSS). From the value of vulnerability index (Kg) and ground shear strain (GSS) can be known how much the level of vulnerability of the area to earthquakes. Furthermore, a spatial description of the distribution map of the seismic vulnerability index (Kg) and the ground shear strain value distribution map (GSS) were made in Kawalu Subdistrict, Tasikmalaya City. The dominant frequency value is obtained from 0.6 Hz to 16.7 Hz. The seismic vulnerability index (Kg) from Kawalu Tasikmalaya ranges from 0.2 to 20, and the GSS value from the low is 0.17 in the village of Urug to the highest of 12.13 in the village of Leuwiliang. This allows Kawalu Subdistrict to get a deformation phenomenon such as liquefaction, landslides when earthquake.

The effect of addition sorbitol and Carboxy Methyl Cellulose (CMC) on the quality of biodegradable plastics from avocado seed starch Lydia Margaretha; - Ratnawulan
PILLAR OF PHYSICS Vol 13, No 2 (2020)
Publisher : Department of Physics – Universitas Negeri Padang UNP

So far the plastics used are made of synthetic polymer materials that are difficult to decompose in nature and their availability is very limited. The use of synthetic plastics increases every year so that it has an impact in the form of environmental pollution. Therefore, the effort can be made to tackle plastic waste, namely by replacing the use of synthetic plastics with biodegradable plastics. Biodegradable plastics used are made from natural materials, for example, starch. The starch used in this study was avocado seeds. Determination of the quality of biodegradable plastics is based on the results of tensile tests, elongation tests, and biodegradation tests of biodegradable plastics. The steps involved in determining the optimum conditions for CMC with a variation of CMC used as much as 15%, 20%, 25% (w/w starch), the second stage is determining the optimum conditions for sorbitol with a variation of 20%, 30%, 40% (w/w starch), the third stage is mixing avocado seeds starch with sorbitol and CMC of 20% by weight of avocado starch. The optimum condition for CMC was obtained from the addition of 3 grams of avocado seed starch and 20% CMC of starch (w/w starch) with the resulting tensile strength value of 9,07 MPa and 21,39% elongation, while the optimum condition for sorbitol was obtained from the addition of 3 grams of avocado seed starch and sorbitol of 40% by weight of avocado starch with a tensile strength value of 7,79 MPa and 24,38% elongation while the highest tensile strength value from mixing sorbitol and CMC was obtained from the addition of sorbitol concentrations of 40% by weight of avocado starch and CMC 20% by weight of avocado seed starch, namely 3,79 MPa and elongation of 32,61%. Percent of lost plastic weight has increased day by day. The largest percentage loss of biodegradable plastic weight was obtained from the addition of sorbitol concentrations as much as 20% w/w starch and CMC 20% w/w starch, which was 91,67%. The biodegradable plastic made from avocado seed starch is almost completely biodegradable by the eighth day.

Estimated of metal mineral distribution using Induced Polarization (IP) Geolistric in Malalak West Sumatra Indonesia Ahmad Kasasi; - Akmam
PILLAR OF PHYSICS Vol 13, No 2 (2020)
Publisher : Department of Physics – Universitas Negeri Padang UNP

The Malalak area in West Sumatra Indonesia area located around the volcano and generally rich in economically valuable metal minerals, however, the presence of minerals in nature is not easy to find. The existence of economically valuable minerals around volcanoes, such as Mount Singgalang has not been widely revealed. Based on the above, a study aimed to estimate the distribution of metal minerals in Malalak Subdistrict, Agam Regency when viewed by the Geoelectric Induced Polarization (IP) method was conducted. Research is needed as reference data to predict mineral potential in the study area so that it can be used by the Malalak community. The exploration method used in this research is the Geoelectric Induced Polarization (IP) method. Data obtained by measuring using the ARES measuring instrument. Data processing uses Res2Dinv software to obtain 2D cross-sections and the data is interpreted using Smoothness-Constraint Least-Square inversion. Based on the estimates made to determine the distribution of minerals in the Malalak District, the types of minerals are Bornite in Line 1 with Chargeability of 6.93 msec and mineral Galena in Line 2 with Chargeability of 4.30 msec. The rock types found in Malalak District, consist of Sandstone, Limestone, and Granite. Track 1 has a type of rock with a resistivity value, namely Sandstone with a value of 58.4 Ωm - 295 Ωm, Limestone with a value of 296 Ωm - 1,501 Ωm and Granite with a value of 1,502 Ωm - 38,768.04 Ωm. Track 2 has a rock type with a resistivity value, namely Sandstone with a value of 58.5 Ωm - 287 Ωm, Limestone with a value of 288 Ωm - 1,412 Ωm and Granite with a value of 1,413 Ωm - 34,179.12 Ωm.

The effect of composition MnFe2O4 / PANi nanocomposite on the microstructure that synthesized by spin coating method Lucya Sinurat; Yenni Darvina; - Ramli; - Ratnawulan
PILLAR OF PHYSICS Vol 13, No 2 (2020)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Manganese ferrite has the structure of MnFe2O4 which in the process of making it uses manganese mineral powder. Based on the MnFe2O4 testing is one material that is suitable for use as a composite by mixing other binders in it. Polyaniline (PANi) is a polymer that can be used as a binding material which is an attractive conductive polymer because it has unique properties and good thermal stability. This research was conducted by making three variations of the composition of MnFe2O4 / PANi namely 40%: 60%, 50%: 50%, and 60%: 40% made using the spin coating method. This research was conducted to investigate the effect of composition on the microstructure of the MnFe2O4 / PANi nanocomposite layer using the spin coating method. The microstructure to be investigated is the functional group of grain size and thickness of the nanocomposite layer. The tools used in this study are Fourier Transform Infrared (FTIR) used to obtain the functional groups of nanocomposite layers, X-ray Diffraction (XRD) is used to get the size of crystals and microstructure of crystals, and the Scanning Electron Microscope (SEM). Characterization and Scanning Electron Microscope (SEM) are used to obtain grain size and thickness of the nanocomposite layer. The results of the FTIR characterization are the functional groups of MnFe2O4 / PANi which produce absorption bands at wavenumbers 3214.85 cm-1, 3353.86 cm-1, and 3214.03 cm-1, which are O-H groups. The absorption band at wavenumbers 717.00 cm-1, 763.94 cm-1, and 747.31 cm-1 is the C-H group showing PANi. Absorption peaks that are below 1000 cm-1 that is at wavenumbers 874.78 cm-1, 924.18 cm-1, and 895.96 cm-1 show indications of Manganese Ferrit. The results of the XRD characterization were crystal size and microstrain, each of which had a crystal size composition of 49.90478417 nm, 45.29656118 nm, and 44.52213202, and then for the value of the microstrain, each variation was 0.116667149, 0.15983276, and 0.183718732. Then from SEM characterization results obtained grain size values of 0.445 μm, 0.426 μm, 0.318 μm, while the thickness obtained for each variation is 1.29 μm, 2.02 μm, and 2.20 μm. Based on the results of the study, the greater the addition of PANi composition given, the value of crystal size, grain size also increases while the value of microstructure and thickness decreases.

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Home Page

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Contact Name Syafriani

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Phone +6281267996692

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Editorial Address Department of Physics Universitas Negeri Padang UNP Prof. Dr. Hamka Street, Air Tawar, Padang 25131

Location Kota padang, Sumatera barat INDONESIA

Abstract

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Contact Name
Syafriani

Contact Email
syafri@fmipa.unp.ac.id

Phone
+6281267996692

Journal Mail Official
fisikasains@fmipa.unp.ac.id

Editorial Address
Department of Physics Universitas Negeri Padang UNP Prof. Dr. Hamka Street, Air Tawar, Padang 25131

Location
Kota padang,

Sumatera barat

INDONESIA