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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 16 Documents

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Search results for , issue "Vol 12, No 2 (2019)" : 16 Documents clear

Pembuatan tool modeling eksperimen bidang miring dengan pengontrolan sudut kemiringan otomatis untuk analisis video tracker (Experimental inclined plane modeling tool fabrication with automatic tilt angle control for video tracker analysis) Yolla Octriany; - Asrizal
PILLAR OF PHYSICS Vol 12, No 2 (2019)
Publisher : Department of Physics – Universitas Negeri Padang UNP

One of the experimental science knowledge of physics . Through experimental activities many motion phenomena can be observed, such as the dynamics of motion. One of the dynamics phenomenon of motion that can be done is the motion experiment in the inclined plane. From the observation results, it is known that the motion experiments on the incline were still done manually, namely changing the slope angle and measuring the time on the incline plane experiment still manually to determine the coefficient of kinetic friction, speed, acceleration, and rope tension. The previous set of sloping field experiments had limitations in displaying the results of measurements of physical quantities. One solution to solve the problem was to make modeling tool and analyze it with tracker software . The aims of this research were determine the specification of the performance of experimental modeling tools on the inclined plane, determine the value of kinetic friction coefficient, determine the value of accuracy and accuracy, and determine the effect of changes in tilt angle. This research was a type of engineering research. Engineering research is a design activity that involves things that are relatively new, both in the form of processes or products or prototypes. Data collection was done in two ways, namely through direct and indirect measurement. The direct measurement results of this research were the value of the change in the tilt angle and the indirect measurement results are the values of kinetic friction coefficient, velocity, acceleration, and rope tension in the video software tracker data analysis technique. Based on the results of data analysis four research results can be stated. First, the specification of the performance of the modeling tool on the sloping plane experimental plane with a sliding plane with a length of 50 cm and a width of 10 cm and a base with a length of 40 cm and a width of 10 cm. NEMA 17HS Stepper Motor is used for tilt angle control. Second, the value of the kinetic friction coefficient carried out with the object launch experiment was 0.265. Third, the accuracy value is 93.00% and the accuracy result is 97.00%. Fourth, the greater the tilt angle, the smaller the speed and acceleration values. The value of the rope tension, the greater the angle of inclination, the greater the value of the rope tension.

Rancang bangun detektor ketinggian air di landasan pacu pesawat terbang berbasis internet of things (Water level detector fabrication design on an airplane runway based on the internet of things) Puti Aulia Mardiah; - Yohandri
PILLAR OF PHYSICS Vol 12, No 2 (2019)
Publisher : Department of Physics – Universitas Negeri Padang UNP

The runway of an aircraft is designed to keep it dry even if it rains to avoid hydroplaning. Hydroplaning is a plane slip on the runway due to standing water. In accordance with regulations from the Airport Directorate, DGCA NO. KP 212 in 2017, the operational requirement for runways to be able to serve landings and aircraft flights is when there is a maximum of 3 mm of standing water on the runway surface. The design of the water level detector on the runway uses the Arduino Mega 2560 as a microcontroller which processes and sends the detected data to the thingspeak via the internet network. Performance specifications for water level detectors are water level sensor designs, U detector pipes, runways, electronic circuits. The water level sensor is a touch sensor that is designed and printed on a PCB board with horizontal and vertical strip designs. However, the level of accuracy and accuracy of the vertical sensor strip design is higher than the horizontal sensor strip design. Detected data will be processed in Arduino Mega 2560 and typed into the thingspeak page using the internet network. Data output can be accessed via a PC or smartphone connected to the internet network. The results of comparison with standard tools found the average percentage of errors for the horizontal sensor strip design was 97.08% while for the vertical sensor strip design was 4.98%. From the comparison results, the average percentage of accuracy for the horizontal sensor strip design is 8.57% and for the vertical sensor strip design is 95.01% with precision of 42.32% and 84.77%.Keywords : Arduino Mega 2560, Internet Of Things, thingspeak, sensor strip design

Pembuatan tool pemodelan eksperimen gerak parabola dengan pengaturan sudut elevasi untuk analisis video tracker (Experimental modeling tools fabrication for parabolic motion with elevation angle settings for video tracker analysis) Atika Irbah; - Asrizal
PILLAR OF PHYSICS Vol 12, No 2 (2019)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Physics has an important role in the development of Science and Technology. One interesting phenomenon of motion in physics, namely parabolic motion. The importance of the parabolic motion instrument is to understand various types of parabolic motion concepts. From the result of observation, it was known that the parabolic motion experiment was still done manually, namely the measured physical quantities were limited and It can’t display the graph. Experimental tools have weaknesses in parabolic motion experiment activities because they weren’t effective when used. One solution to overcome this weakness is developing a tracker video analysis and modeling tool. The purpose of this research is to determine the performance specifications of a parabolic experiment modeling tool, the design specifications of a parabolic experiment modeling tool, and the effect of the elevation angle change of a parabolic experiment modeling tool. This research can be classified into engineering research method, namely a research method to design a process, product or prototype to make a new contribution. Data collection is done in two ways, namely directly and indirectly measurement. Direct measurement is done by varying the level of the launcher angle in the parabolic motion experiment modeling tool. Indirect measurement is used to determine the accuracy and precision of the parabolic motion experiment modeling tool. Data of the measurement results were analyzed with descriptive statistics in the form of graphs and tables. Based on data analysis, it can be stated that there are three research results. First, the main performance specifications of the parabolic motion experiment modeling tools include: the tool frame size is 14x15x22.5 cm3 and the regulator of elevation angle is done by using the MG995 servo motor. Second, the average accuracy of the experimental results of the modeling tool is 97.38%, while the its average accuracy is 98.59%. Third, the change in elevation angle influences on the time to reach the peak point, maximum height, and time when reaching the maximum distance. The greater the elevation angle causes the value of the time to reach peak point, the maximum height value, and the time to reach the maximum distance also greater. The elevation angle also affects to the maximum distance. From the result of the analysis, it can be confirmed that the maximum distance is obtained when the elevation angle is 45o.

Analisis anomali ketinggian semu (h'F) lapisan ionosfer sebagai prekursor gempa bumi sumatera (Analysis of the pseudo height anomaly (h'F) of the ionosphere as a precursor to the Sumatran earthquake) Ilham Akbar; - Syafriani; Muslim Buldan; - Afrizal
PILLAR OF PHYSICS Vol 12, No 2 (2019)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Sumatra is an area prone to earthquakes, this is caused by a complex Sumatran tectonic system. Therefore, research is needed that aims to determine earthquake precursors as a disaster mitigation effort based on anomalies that occur in the ionosphere by observing pseudo anomalies (h’F) of the ionosphere before the earthquake. The research is a descriptive study by analyzing the ionosphere anomaly h'F, where the earthquake used as the sample of this study is an earthquake that has a magnitude ≥ 7 SR, where observations of ionospheric F layers can be done by utilizing ionosonda which has been installed in the Atmospheric and Space Observation Center (BPAA) Agam, to ensure that anomalies occur are not caused by external factors, the observations are also made through the DST Index. Based on the research that has been done, it is found that the correlation of magnitude to the anomaly h'F is positive or directly proportional. This is indicated by the emergence of a significant deviation of h'F value 7 days before the earthquake event so that observations of the h'f anomaly of the ionosphere layer are recommended as earthquake precursors. Based on the precursors that have been observed, the precursors were observed in the Aceh earthquake on 4, 6, 7 and 9 April 2012. The precursors in the Mentawai earthquake on 18 and 19 October 2012 and the Bengkulu earthquake precursors on 7 and 10 September 2007.

Pengembangan sistem pengaturan kuat tekanan pada alat screen coating untuk membuat lapisan tipis berbasis arduino uno (Development of a pressure strength control system for screen coating tools to make thin films based on Arduino Uno) Rahmatul Fitria; - Yohandri
PILLAR OF PHYSICS Vol 12, No 2 (2019)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Thin layer is a layer made of very thin material with a scale between nano and millimeter. To get a good quality coating, there are several methods that can be used, one of which is the screen coating technique. Screen Coating technique is a coating technique by pouring percusor and then swept it using a rubber rack. In the Screen Coating technique, the size of the substrate used depends on the design made, so that the substrate can be larger than the size of the Dip Coating and Spin Coating substrate. Speed and pressure are very much against the coating produced and for the speed used by Arduino Uno. This research is an experimental study, while this study describes the design specifications and performance design of a Screen Coating tool. Performance specifications describe the performance of the screen coating, while the design specifications explain the accuracy and accuracy of the screen coating. The measurement technique used is direct and indirect measurement. Data obtained directly from the pressure, then data from indirect measurements obtained by analysis of the accuracy and accuracy of the pressure. Based on the results of research that has been done, obtained accuracy from a pretty good pressure with the largest percentage of 2% and an average accuracy of 99.01%. The accuracy of the pressure is quite good, with an average error percentage of 1.66% and an average accuracy of 99.2%.

Pembuatan tool pemodelan eksperimen bandul matematis dengan pengontrolan panjang tali otomatis untuk analisis video tracker (Mathematical pendulum experiment modeling tool fabrication with automatic rope length control for video tracker analysis) - Yani; - Asrizal
PILLAR OF PHYSICS Vol 12, No 2 (2019)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Physics is an interesting science in the world. The reason is that physics is able to explain physical phenomena and phenomena that occur in the world. One of the phenomena in physics is the simple harmonic motion of the mathematical pendulum. Physical phenomena can be observed through experiments using research instruments. The observation results were indicated there that the pendulum mathematical experimental data was only limited to the oscillation time and the number of swings. In addition, the instruments used today have limitations in mathematical pendulum experiments. One solution to solve this problem is to use a mathematical pendulum experimental modeling tool with automatic string length control. This research aims to determine the accuracy and accuracy of string length control, determine the performance specifications of mathematical pendulum modeling tool performance, determine the accuracy and accuracy of mathematical pendulum experiment modeling tools, and determine the effect of string length changes on the mathematical pendulum modeling tool. This research was a type of engineering research which is a non-routine design activity, so that there are new contributions, both in the form of processes and products. Data collection were done in two ways, namely direct and indirect measurement. Direct measurement was done by varying the length of the rope in the mathematical pendulum experiment modeling tool. Indirect measurement to determine the accuracy and accuracy of the mathematical pendulum experiment modeling tool. Data were analyzed with descriptive statistics in the form of tables and graphs. Based on data analysis four research results can be stated. First, the average accuracy of controlling rope length is 99.40% with an average error percentage of 0.59%. The average accuracy is obtained by 99,81% with an average error of 0,70%. Second, the performance of the mathematical pendulum modeling modeling tool is a mathematical pendulum modeling modeling tool measuring 1.0 x 0.7 m with controlling the length of the rope using a stepper motor. Third, the average accuracy of the pendulum mathematical experimental modeling tool is 95.09% with an average error of 4.90%. The average of the pendulum mathematical experimental modeling tool is 98.60% with an average error of 1.40%. Fourth, the longer the rope used the greater the period obtained, it is inversely proportional to the smaller frequency. Meanwhile, the average acceleration of gravity is obtained at 9.95 m/s2 with an average error of 1.50%.

Karakteristik bidang gelincir di Kecamatan IX Koto Sungai Lasi Kabupaten Solok berdasarkan metode geolistrik tahanan jenis konfigurasi Schlumberger (Characteristics of the slip plane in IX Koto Sungai Lasi Subdistrict, Solok Regency based on the geoelectric resistivity method of the Schlumberger configuration) Dori Purnama Sari; - Akmam
PILLAR OF PHYSICS Vol 12, No 2 (2019)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Landslide is which one frequent disaster that caused by weathered soil which is characterized by the existence of slip surfaces. The aims of the research were to find out the shape, depth, and slope angle of slip surface at Sungai Lasi Solok base on Geoelectric Data. Data were collected by Automatic Resistivity System Multi-electrode. The interpretation of the Geoelectric data was used Two Dimensions Smoothness Constraint Least-Square Inversion Method. The slope angle of the slip surface was using the Trigonometry theory. The average results of the research are the shape, depth, and the slope angle of the slip surfaces are rotational slide for fisrt and second line and translational slide for third and fourth line, 32.2175 degrees and 11. 825 meters.

Studi awal pengelompokan batu ginjal menggunakan dual energy micro CT scan (Preliminary study on kidney stone classification used a dual-energy micro CT scan) Fadhila Ulfa Jhora
PILLAR OF PHYSICS Vol 12, No 2 (2019)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Batu ginjal merupakan padatan yang terbentuk di dalam saluran kemih akibat adanya penggumpalan zat-zat organik dan non organik yang seharusnya larut di dalam urin. Batu ginjal harus dikeluarkan baik melalui urin maupun melalui terapi dan pembedahan. Sebelum dilakukan terapi atau pembedahan, perlu diketahui komposisi dan jenis batu ginjal yang diperlukan dalam penentuan diagnosis dan tindakan pengobatan yang tepat. Micro CT merupakan modality pencitraan yang dapat menunjukkan struktur anatomi dan morfologi batu ginjal berdasarkan nilai atenuasinya dengan ketelitian dalam orde mikro dibandingkan dengan CT konvensional biasa. Namun, terdapat kelemahan jika menggunakan single energy micro CT dalam pengelompokan batu ginjal. hasil citra pada energi tinggi tidak dapat membedakan dengan baik antara batu dengan densitas yang rendah dan tinggi namun dosis yang diterima pasien cukup rendah sehingga tidak membahayakan, dan sebaliknya untuk citra energi rendah. Dalam hal ini diperlukan metode dual energi untuk membedakan batu ginjal dengan tepat. Sebelum menggunakan metode dual energi diperlukan data perbedaan atenuasi batu untuk penyinaran berbeda. Oleh karena itu dalam penelitian ini dilakukan perhitungan untuk menentukan nilai atenuasi batu. Metode penelitian dilakukan secara komputasi menggunakan software PEGS4. Sebagai input data adalah komponen penyusun batu dan densitas batu. Hasil yang didapatkan adalah, pertama, dengan tingkat penyinaran berbeda, beberapa batu tidak dapat dikarakterisasi dengan menggunakan single energi saja. Atenuasi brushite dan struvite hampir sama, sehingga sulit untuk dibedakan. Kedua, single energi micro CT perlu dikoreksi menggunakan dual energi micro CT untuk mengelompokkan batu ginjal dengan tepat

Analisis karakteristik periode ulang curah hujan dengan metode Iwai Kadoya di daerah lokal sumatera barat dan regional sumatera (Analysis of the characteristics of the return period of rainfall using the Iwai Kadoya method in the local area of West Sumatra and regional Sumatra) Mia Nova Isnia Gara; Letmi Dwiridal; Sugeng Nugroho
PILLAR OF PHYSICS Vol 12, No 2 (2019)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Sumatera is located in the western part of Indonesia, this result in the Sumatera region has high rainfall, due to the west monsun origaniting from the Indian Ocean a lot through the western part of Indonesia. Sumatera Island are divided into three major parts that have different regional topographies and type pf rainfall, so that characteristics of rainfall in Sumatera are different in each region. High rainfall results in natural disaster, to reduce the impact of disaster mitigation, the rainfall return periodis also used to predict the time needed to resume maximum rainfall. In this study, calculate the rainfall return period from 8 stations. From the calculation results it is known that the re-period of highest rainfall is at the Meteorogical Station of Minang Kabau Airport in the period 1999-2018 with a return period of 30 days- 300 years with the rainfall frequency pf 186-524 mm/day, with equatorial rain type.

Pengaruh komposisi terhadap ukuran butir lapisan nanokomposit CoFe2O4/PVDF dengan metode spin coating (The influence of composition to the grain size of the CoFe2O4 / PVDF nanocomposite layer by using the spin coating method) Diana Putri; Yenni Darvina; - Ramli; - Yulkifli
PILLAR OF PHYSICS Vol 12, No 2 (2019)
Publisher : Department of Physics – Universitas Negeri Padang UNP

The study of nanocomposites have been done much by researchers. Nanocomposites is a mixture of nanoparticle powder consisting of two materials called matrix and filler. The filler used in this study is CoFe2O4 and the matrix is PVDF. This study advantageous for investigating the micro structure of CoFe2O4/PVDF nanocomposite layer. The micro structure to be is the size of crystals, the micro strains, the size of grains and the thickness of nanocomposite layers. It is a research experiment that uses variations in composition 10 ml : 10 ml, 10 ml : 20 ml, 10 ml : 30 ml. The characterization tools used were X-ray Diffraction (XRD) and Scanning Electron Microscope (SEM). XRD is used to get the corner of two theta and a half peak width (FWHM) from a layer of nanocomposite. SEM characterization gets to morphology of the surface and the thickness of nanocomposite layers. The thickness of a nanocomposite layer obtained is that 25.11 m, 29.81 m, and 35.51 m. Based of research already done, the more thickness of a nanocomposite layers the size of crystals and micro strains has also increased.

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Contact Name
Syafriani

Contact Email
syafri@fmipa.unp.ac.id

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+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