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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 297 Documents

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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

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.

Analisa ukuran bulir mineral magnetik pada lindi tpa sampah kota padang menggunakan metoda Anhysteretic Remanent Magnetization (ARM) (Analysis of magnetic mineral grain size on leachate of Padang city waste landfill using the Anhysteretic Remanent Magnetization (ARM) method) Risaldi Putra; - Mahrizal; Fatni Mufit
PILLAR OF PHYSICS Vol 6 (2015)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Padang city has landfill located in Air Dingin Village Balai Gadang Koto Tangah Subdistrict of Padang. This landfill has some leachates that assumed there is seepage from leachate pond to the river and drain. The results observation present that the river is decomposed and its color is changed so it obliged to research about Pollutants of Landfill (TPA) Padang City Mineral Magnetic Basis. The purpose of the research is to determinate grain size and mineral magnetic domain in Leachates of Landfill (TPA) Padang City by using ARM (Anhysteretic Remanent Magnetization) Method. The samples research were 6 samples that taken from leachate pond, the river, and drain at landfill (TPA) area. Measuring instruments that utilized were Ekman Grab, Susceptibility Meter, Molsfin AF demagnetizer, PARM ( Partial Anhysteretic Remanent Magnetization) and Minispin Magnetometer. The data collection was analyzed by plotting the correlation between relative intensity (I/Io) and magnetic field by using Lowrie and Fuller Kurve Test as comparative kurve for measuring grain size and magnetic domain. The research results showed that grain size of leachate pond sample is about 6 μm up to 135 μm, whereas grain size of river and drain samples are about 110 μm up to 135 μm. Magnetic domain sample was obtained of the research result is pseudo single domain (PSD) and multi domain (MD). Grain size was obtained from river and drain sample bigger than grain size of leachate pond sample. Mineral magnetic of leachate pond is more disposed to PSD whereas mineral magnetic of river and drain is more disposed to MD. Based on the results, the river and drain samples are expected that it has contaminated mineral magnetic of leachate pond (anthropogenic)

Analisis jenis mineral magnetik dari polutan kendaraan bermotor menggunakan metode Isothermal Remanent Magnetization (IRM) di Kota Padang (Analysis of magnetic mineral types from motorized vehicle pollutants using the Isothermal Remanent Magnetization (IRM) method in Padang City) Pramita Syafrina; - Mahrizal; Harman Amir
PILLAR OF PHYSICS Vol 1 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Polution is big problem in many city. Iron-oksida is very small and dangeraous for healty, so important to measure who give information about magnetic field. The source of polution are mount eruption, forest fire and motor vehicle. In this eksperiment we studying about kind polution from motor vehicle. The kind polutan of vehicles was know with Isothermal Remanent Magnetization (IRM) method. In this eksperiment 93 sample, 45 top soil sample, 40 wood sample and 8 for leaf sample. The result of data analysis indication that intensity magnetization of top soil is 10.24 to 11.974.558 mA/m for wood sample is 0,22 to 7.186,20 mA/m and for leaf 0.33 to 900.31 mA/m. The analysis for saturation kurva of IRM for samples is magnetite (Fe3O4) because out field ≤ 300 mT. Keywords: Isothermal Remanent Magnetization (IRM), magnetite

PENENTUAN JENIS MINERAL MAGNETIK GUANO DARI GUA SOLEK DAN GUA RANTAI KECAMATAN LAREH SAGO HALABAN KABUPATEN LIMA PULUH KOTA MENGGUNAKAN METODE ISOTHERMAL REMANENT MAGNETIZATION (IRM) Wilda Febi Rahmadhani
PILLAR OF PHYSICS Vol 2 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Based on magnetic susceptibility value from guano of Solek and Rantai Caves, known that guano contain magnetic mineral. Unless the kinds of guano magnetic mineral from both caves didn’t know. Because of that, in this research determined the kinds of guano magnetic mineral, especially the kinds of magnetic mineral from Titanium-Iron Oxide. The method that used to determines magnetic mineral of Titanium-Iron Oxide is Isothermal Remanent Magnetization (IRM) method that detected uses IRM saturation curve and S-Ratio. The sample that detected by IRM saturation curve are guano from Solek and Rantai caves, while the sample that detected by using S-Ratio is guano from Solek cave. Based on IRM saturation curve, known the kinds of magnetic mineral that contain on guano from Solek and Rantai caves are magnetite, and the result of analysis uses S-Ratio is known the kinds of contained mineral magnetic on guano from Solek cave is also magnetite. So, can be indicated that the kind of contained magnetic mineral on guano from Solek and Rantai caves is magnetite. Keywords: Guano, the kinds of magnetic mineral, Isothermal Remanent Magnetization (IRM), Saturation Curve, S-Ratio

Effect of ZrO2 addition on the NTC thermistor characteristics based on Fe2O3 from the mineral yarocyte Rosi Selfia Putri; Ratnawulan Ratnawulan; Dani Gustaman Syarif
PILLAR OF PHYSICS Vol 10 (2017)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Ceramic pellet has been made for the Negative Thermal Coefficient (NTC) thermistor from Fe2O3 base material of yarosite mineral. The powder of Fe2O3and ZrO2 is mixed and then crushed until homogeneous for ± 30 minutes. The mixture of the powder is pressed with 60 ton/cm2 to form a pellet on the 8 mm diameter mold. The pellets are sintered at a temperature of 1200oC for 3 hours in a furnace with atmospheric air. The pellet from the sintering process is coated with silver as an electrode. Next will be characterized using XRD (X-Ray Diffractometer), SEM (Scan Electron Microscope) and electrical characterization. Based on the results of XRD analysis it is known that the ceramics formed with the addition of ZrO2 0% doping, ZrO2 1% and ZrO2 3% have hexagonal hematite structure. Grain size based on SEM analysis, for each addition of 0% doping, ZrO2 1% and ZrO2 3% respectively is 10.81 μm; 11.51 μm and 10.24 μm. Results of measurement of electrical resistance, thermistor constant value is 3322 K, 3645 K and 5873 K. Conclusion in this study is the addition of ZrO2 does not affect the crystal structure formed based on the analysis using XRD. Addition of ZrO2 into Fe2O3 ceramic causes the grain size is relatively unchanged significantly. Based on the measurement of lstric resistance, the greater the ZrO2 addition concentration, the greater the resistance value at room temperature and the resulting thermistor constant

Estimasi kedalaman batuan dasar menggunakan metode inversi robust 2-D data geolistrik tahanan jenis konfigurasi dipole dipole di Bukit Apit Puhun Kecamatan Guguk Panjang Kota Bukittinggi (The estimation of the depth of the bedrock uses a robust 2-D inversion method of resistivity geoelectric data with a dipole dipole configuration at Bukit Apit Puhun, Guguk Panjang District, Bukittinggi City) - Bavitra; - Akmam; Harman Amir
PILLAR OF PHYSICS Vol 6 (2015)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Bukit Apit Puhun Bukittinggi area is located at Sianok fault zone. This area was potensially occur tectonic activity such as earthquakes. Tectonic activity could disturb the stability of the bedrock. The aim of this research was to determine the resistivity and to depth of basement bedrock in Bukit Apit Puhun Bukittinggi area. This research used Robust 2D inversion Geoelectrical data with Dipole-dipole configuration. The Data of this research were taken five track using ARES (Automatic Resistivitymeter). The data were processed and interpreted with using Robust 2D inversion. The result of this research showed that type of basement bedrock in Bukit Apit Puhun Guguk Panjang was an igneous groups, namely Andesite. Resistivity of Andesite bedrock were varies on the each track. The resistivy of Andesite was 352 Ωm – 7598 Ωm. Depht of Andesite bedrock were varies, which generally more than 30 meters deepness at Bukit Apit Puhun Bukittinggi area

Analisis teoritik nanopartikel Zirkonium Dioksida (ZrO2) (Theoretical analysis of Zirconium Dioxide (ZrO2) nanoparticles) Ayutia Zusya Putri; - Ratnawulan
PILLAR OF PHYSICS Vol 12, No 1 (2019)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Nanopartikel memiliki sifat fisis yang jauh lebih baik daripada partikel yang berukuran besar .Zirkonium Dioksida (ZrO2) adalah logam yang mempunyai warna putih keabu abuan yang tahan pada suhu tinggi dan mempunyai struktur kristal lebih dari satu. Pada penelitian ini nanopartikel yang digunakan adalah nanopartikel Zirkonium Dioksida (ZrO2) dengan menggunakan metoda sol gel dan didapatkan hasil bahwa nilai diameter partikel yang dianalisis menggunakan Surface Area meter sebesar 32,98nm dan Zirkonium Dioksida (ZrO2) yang dianalisis dapat dikategorikan sebagai ukuran nanopartikel

Analisis komposisi unsur Fe terhadap nilai suseptibilitas magnetik di Kota Padang menggunakan metode X-Ray Fluorescence (XRF) (Analysis of the elemental composition of the magnetic susceptibility value in Padang City using the X-Ray Fluorescence (XRF) method) Elsa Feryani Harifan; - Mahrizal; Fatni Mufit
PILLAR OF PHYSICS Vol 5 (2015)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Many industrial processes such as steel and cement production produces shaped particles of dust and fly ash. The particles containing pollutants shaped magnetic minerals belonging to the type of iron sulfide minerals iron and titanium sulfide. These pollutants come from the burning of coal. Basically, before burning coal is not magnetic. In the combustion process produces pyrite which decompose and form pyrrhotite and sulfur gases. At temperatures above about 1350 K, pyrrhotite decomposes into iron and sulfur. Iron (Fe) is the most dangerous heavy metals contained in the topsoil. In this study measured the magnetic susceptibility values and elemental composition to analyze the elemental composition Fe of the magnetic susceptibility values,The sample in this study is the topsoil. Measurements of magnetic susceptibility values topsoil samples performed using magnetic susceptibility meter. Then the measurement of the elemental composition of ten samples using X-Ray Fluorescence (XRF) spectrometer. Measurement data plotted in the form of a graph to show the relationship of the value of the elemental composition of Fe magnetic suseptbilitas. Meanwhile, the results of magnetic susceptibility meter, magnetic susceptibility values can inform the type of magnetic minerals based on magnetic susceptibility values.The results of this study indicate that the intensity of the magnetic susceptibility is not only influenced by the composition of the elements Fe, but also influenced by other elements contained in topsoil samples, such as Al, Si, Ca, and Ti. Weight percentage of Fe and Ti derived from the main constituent mineral iron is ilmenite, are paramagn

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.

Pembuatan alat ukur momen inersia benda digital menggunakan sensor optocoupler Nunung Rivia
PILLAR OF PHYSICS Vol 8 (2016)
Publisher : Department of Physics – Universitas Negeri Padang UNP

The moment of inertia is the tendency of an object to remain stationary or move straight regular (maintaining position or situation). The moment of inertia of an object can be measured using a measuring instrument works on the moment of inertia oscillation method. The purpose of this study was to design a measuring tool moment of inertia of objects digitally using optocoupler sensor, as well as explaining the specification of performance, accuracy and precision of the system. Three are results of this study. First, the performance specifications of the system consists of mechanical systems and is supported by an electronic system. Second, the measurement accuracy by comparing the calculation results with the system theoretically has an average error percentage 3,948% and 96,05% for the relative accuracy of the measurement of some moments of inertia of the object. Third, the precision measurements carried out by measuring the variation of the moment of inertia for 6 items and 10 repetitions with precision the average was 0,979 with a standard deviation of the average 0,000009152 and relative error average 0,834%

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Contact Name
Syafriani

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syafri@fmipa.unp.ac.id

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+6281267996692

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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