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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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Study on tools and measuring results of wind speed using the agroclimate automatic weather station (AAWS) instrument at BMKG Sicincin Astuti Kirana Fachry; Zulhendri Kamus; Sugeng Nugroho
PILLAR OF PHYSICS Vol 9 (2017)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Wind speed and direction is required data in agriculture. Wind speed and direction will usually help pollinate plants, but it can also be used for the determination of the future grow. One of the instrument used to determine wind speed and direction are AAWS (Agroclimate Automated Weather Station). This instrument is used to measure weather elements Unsu-one speed and direction of this AAWS angin.Pada for measuring the weather elements such as wind speed and direction using an ultrasonic anemometer. The wind data must first be processed and analyzed so that it becomes useful information, one result is a diagram windrose plot (WRPLOT). WRPLOT can perform calculations in generating wind rose diagrams and frequency distribution of wind data quickly so that the information resulting from the analysis of wind speed and direction to be more informative and interactive. From the analysis of the measurement data of wind speed and direction were performed using WRPLOT showed, that the wind speed in the morning with a range 2,1-3,6m / s blowing from the southwest. During the day the wind speed decreased to 0.5 to 2.1 m / s blowing from the northeast and east. While at night the average wind speed was 0.5 to 2.1 m / s blowing from the northeast and east as well.

PENDAHULUAN JURNAL PENDAHULUAN JURNAL DAFTAR ISI
PILLAR OF PHYSICS Vol 2 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

CoverDewan RedaksiDaftar Isi

Analisis sifat listrik nanokomposit Fe3O4/PVDF yang disintesis dengan metode sol gel untuk aplikasi elektroda baterai lithium ion (Analysis of the electrical properties of Fe3O4 / PVDF nanocomposites synthesized by sol gel method for lithium ion battery electrode applications ) - Rahmi; - Ramli; Yenni Darvina
PILLAR OF PHYSICS Vol 11, No 2 (2018)
Publisher : Department of Physics – Universitas Negeri Padang UNP

As technology develops at this time, all electronic components require a voltage source. One source of voltage is the battery. West Sumatra is one area that is rich in eccentrics. Iron ore content in Tiram Beach in West Sumatra is 34.015%, followed by other elements as pollutants. However, basically there is still a lack of public knowledge about nano materials. Nano composite is a mixture of matrix and filler with a certain composition. This study aims to find out which is good for making lithium batteries. The requirement for making lithium batteries is high conductivity and high capacitance. At this time also look at the properties of fe3O4 nano compresses. Based on experiments that have been carried out will produce Fe3O4 and PVDF, the greater the value of electrical conductivity and capacitance will be. The conductivity values obtained were 437082.9 S / m, 8337755 S / m, 753969 S / m, 9300430 S / m, 1034708 S / m and the capacitance value was 35.94μF, 37.8 μF, 5.2 μF, 194 μF, 2.68 μF. Based on the results that can be used is a large amount of 10 ml: 30 ml.

Fabrication of analog signal interface system into digital data for fluxgate sensor vibration Devi Sidiq
PILLAR OF PHYSICS Vol 4 (2014)
Publisher : Department of Physics – Universitas Negeri Padang UNP

The purpose of this research is to develop an interface communication between vibration measuring device that has analog signals (voltage) with a personal computer, and process its received data to become digital signals data that can be presented. The USB based communication with low speed (1,5 Mbit/s) and full speed (12 Mbit/s) were used interface communication. This research is categorized as laboratory experimental research. Measuring and colleting data were directly collected from vibration measuring device. The maximum sensitivity resolution of the vibration measuring device due to amplitude is 2.19 x 10-3 cm. The processing of received data to become digital signals used MPLAB X IDE for microcontroller program and C# program for creating window application. Digital data layout from the same vibration with different distance of source already showed different input source

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%.

Pengaruh tingkat energi penyinaran terhadap sifat optik pusat warna F-center pada kristal LiF menggunakan spektrometer Uv-Vis (The effect of irradiation energy level on the optical properties of the F-center color center on the LiF crystal using a Uv-Vis spectrometer) Qerzi Elsadola; - Ratnawulan; - Hidayati
PILLAR OF PHYSICS Vol 6 (2015)
Publisher : Department of Physics – Universitas Negeri Padang UNP

The phenomenon of color centers in the crystal has been used in various fields, one of which is the imaging plate. Imaging plate is a sheet that can capture and store the information carried by the X-ray. The base material of this imaging plate is alkali halide crystals. Imagine Plates widely used in hospitals for X-ray. To maximize the results of X-ray readings, required a large absorption. This research was done by varying the energy of radiation used. The purpose of this study was to observe the effect of the energy radiation to the optical properties of F-center in LiF crystals and determine how the time effect on the value of the LiF crystals concentration. Optical properties related to the nature of light and the interaction of light with materials. The optical properties were observed in this research is the absorption coefficient and concentration of color centers. Value of the F-center absorption coefficient obtained for the variation of time of 1 hour, 2 hours and 3 hours for 50 keV, 60 keV, 70 keV, 80 keV and 90 keV. Based on result of the research revealed that the greater the absorption, the concentration will also increase

Analisis variasi curah hujan harian untuk menentukan ragam osilasi atmosfer di Kota Padang (studi kasus data curah hujan harian tahun 2002-2011) (Analysis of variations in daily rainfall to determine the variety of atmospheric oscillations in the city of Padang (case study of daily rainfall data for 2002-2011)) Anggia Arista; - Asrul; Sugeng Nugroho
PILLAR OF PHYSICS Vol 1 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

ABSTRACTThe rain is the important thing in the human life. The higher rainfall can influence the public activities in many life area. They factors that influence rainfall are geographic position in a region and atmosphere phenomenon. Many atmosphere oscillation phenomenons are MJO, SAO, AO, QBO and ENSO. By knowing the phenomenon or oscillation of atmosphere are happened in a region can give the benefits for the human. Because of that the writer interested to do a researche about Analisys of Rainfall’s Daily Varian to Determine Atmosphere Oscillation Variation in Padang by using detailed result of rainfall in Padang on periode 2002-2011. This researche is a descriptive researche the data are used in this researche is the detailed result of daily rainfall in Padang from BMKG Tabing that have been taken from 2002 to 2011. The determination of rainfall’s variation can be proceed by using exel program and determination of oscillation manner can be determinate by using WWZ program an serfer 7. Based on analisys of rainfall’s data are gotten that highest rainfall’s happened in March and September while oscillation manner are gotten that they are oscillation of daily atmosphere or MJO, seasonal oscillation (SAO), annual oscillation (AO) and quasi biennial oscillation (QBO). Dominant oscillation manner was happened in Padang is the atmosphere oscillation type MJO that 25 times happen in range of time 2002-2011. Keywords: Rain, oscillation, phenomenons of atmosphere

SIFAT MEKANIS KOMPOSIT BERPENGUAT BILAH BAMBU DENGAN MATRIKS POLYESTER AKIBAT VARIASI SUSUNAN Wiwi Aprilia
PILLAR OF PHYSICS Vol 2 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Research about composite mechanical from natural fiber expecially bamboo is still seldom used. Therefore, this research is done with purpose to know effect of piece arrangement of bamboo toward composites mechanic that include maximum tension value and elasticity value. The research is experiment reseach. Piece of bamboo is arranged three variaties, are longer, across and plait. From three arrangement are counted tension value and elasticity to know mechanical characteristic. The results of this study: highest voltage value is 78.173 MPa in longer piece, tension value part of plait is shorter than longer piece 44.538 MPa and tension value of across fiber is shorter than embroidery piece 18.936 MPa. Result of measurement results to elasticity value in power curve the highest is 150.15 GPa in longer fiber, plait fiber is shorter than long fiber about 86.26 GPa and across fiber is shorter than plait about 50.209 GPa Keywords: bamboo, mechanical properties, composite, reinforcement, polyester

Fabrication of digital parabolic motion experiments set based on the ATMEGA328 microcontroller to measure motion parameters Farah Sarjani; Yohandri Yohandri; Zulhendri Kamus
PILLAR OF PHYSICS Vol 10 (2017)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Technological developments have produced many tools that can facilitate human work in industrial and scientific needs. In addition, electronics has also produced sophisticated components, both in the manufacture of measurement systems and experimental set-making system. This research created a set of digital parabolic motion experiment that display the value of time, speed and distance of objects. The purpose of this research is to know the performance and design spesifications a set of digital parabolic motion experiment using photogate and vibration sensors based on ATMega328 microcontroller to measure the parameters of motion. This research is a laboratory experiment. The measurement technique used is direct and indirect measurements. Direct measurement made to determine the value of time, speed and distance of objects that display on the LCD. Indirect measurement is made to determine the accuracy and precision of digital parabolic motion experimental set system. Analysis of measurement results can be explained that there are two important results from this research. First, the result of the measurement system design consist of launcher made from the photogate and vibration sensors as the sense of object (projectile) passing through the sensor. Second, set of digital parabolic motion experiment has a precise value that can be determined from the percentage of error between the actual value

Degradasi kualitas fisis air Danau Maninjau terhadap variasi jarak dan jumlah keramba (Degradation of the physical quality of water in Lake Maninjau with variations in distance and number of cages) Puput Mulya Sari; Yenni Darvina; - Hamdi
PILLAR OF PHYSICS Vol 6 (2015)
Publisher : Department of Physics – Universitas Negeri Padang UNP

The purpose of this research are to analys physical quality (temperature, pH, electrical conductivitas, turbiditas, and concentrasion of lead) at Maninjau Lake. Maninjau Lake has problem die of fish and make harm farmer of keramba. This research use variation of distance 0 m, 5 m and 10 m and three locations Bayua, Koto Gadang and Sigiran. The standart for physical quality, temperature 23-30 oC use Thermometry, turbiditas <5 NTU use Turbidimetry, pH 6-9, electrical conductivitas <250 µS/cm use Conductivity Metry and then concentration of Lead <0,03 mg/l use AAS. The result Bayua has worse the physical quality (temperature 31,0 oC, pH 5,6, electrical conductivitas 125,2 µS/cm, turbiditas 5,1 NTU, Lead 0,954142 mg/l). While Koto Gadang (temperature 29,5 oC, pH 7,1, conductivitas 123,1 µS/cm, turbiditas 4,8 and concentrasion of lead 0,3778 mg/l) has worse the physical quality than Sigiran (temperature 27,5 oC, pH 7,5, conductivitas 99,7 µS/cm, tur

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

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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