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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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Optimalisasi konduktivitas ionik dan sifat mekanik bahan polimer elektrolit padat baterai berbasis kitosan dengan penambahan plasticizer (etilen glikol dan gliserol) (Optimization of ionic conductivity and mechanical properties of chitosan-based solid electrolyte polymer materials with the addition of plasticizers (ethylene glycol and glycerol) Luzi Lovita NK; - Syakbaniah; Evi Yulianti
PILLAR OF PHYSICS Vol 5 (2015)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Have been obtained solid-state electrolyte based on chitosan by the casting technique from a solution containing of chitosan, montmorillonite, LiClO4 and plasticizer by using two different types of plasticizers are: ethylene glycol and glycerol. This study purpose to know what is the concentration of ethylene glycol and glycerol as plasticizer can be obtained solid-state electrolyte based on chitosan with ionic conductivity and mechanical properties are optimum for rechargeable battery applications. Ionic conductivity properties were characterized by using LCR meter, mechanical properties were characterized by mechanical tests, and microstructure using optical microscopy. The results showed that the optimum composition obtained in 50% ethylene glycol with an ionic conductivity of 1,26 x 10-3 S/cm, tensile strength of 41,59 MPa and 77,5% elongation. At the optimum conditions obtained in glycerol concentration of 25% with an ionic conductivity of 2,51 x 10-3 S / cm, tensile strength of 32,14 MPa and 69,3% elongation. Of both plasticizer, glycerol give better ionic conductivity and films produced by using glycerol are smoother and it`s texture looks more evenly, while ethylene glycol gives better mechanical properties.

Land subsidence estimation using DinSAR method ALOS PALSAR image in Padang City West Sumatra, Indonesia Rahmi Sukmawati; Mirza Muhammad Waqar; - Syafriani; - Yohandri; Joshapat T. Sri Sumantyo
PILLAR OF PHYSICS Vol 14, No 1 (2021)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Land subsidence is a phenomenon that occurs in big cities around the world and in Indonesia. Padang as one of the largest cities in West Sumatera also facing land subsidence due to natural phenomena and human induced. Padang City is located at the west coast of Sumatera Island which is the junction point of three active plates that cause frequent earthquakes. Main goals of this research are to know the distribution of area affected by land subsidence, to know the estimated value of land subsidence and to know the value of the velocity of land subsidence in Padang area using DInSAR method. The data used in this study is ALOS PALSAR Image Level 1.1 of Padang city during 2007 to 2010 was obtained through JMRSL CERES Chiba University, Japan and collected through Alaska Satellite Facility website. Differential Interferometric Synthetic Aperture Radar (DInSAR) is a technique considered to be one of the most efficient technique for detecting land subsidence. The DInSAR method is used in mapping altitude changes developed into a land-subsidence map each year. The mapping results show the distribution of the areas affected by the maximum land subsidence in Padang area of West Sumatera are Padang Utara, Nanggalo, and Padang Barat Subdistricts. The land subsidence insignificant occurred is Padang Selatan and Lubuk Begalung Subdistricts. The estimated value of the land subsidence distribution in Padang area using DInSAR method has decreased significantly after the earthquake of September 30, 2009 in Padang Utara, Nanggalo and West Padang Subdistricts is around 0 - 32.70 cm, and the value of land subsidence velocity is around 0.13 - 12 cm/year. One of the expected effects of land subsidence can be increased in the area susceptible for flooding in Padang city.

Estimasi 3-d kedalaman batuan dasar menggunakan data geolistrik tahanan jenis konfigurasi dipole-dipole di Bukik Lantiak Padang Selatan Hamidah Hamidah
PILLAR OF PHYSICS Vol 8 (2016)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Bukik Lantiak which is located in Padang West Sumatera often has the landslide disaster. One of the factor that espouse landslide was the condition of the rock which was arrange the area such as bedrock. The type and the depth of bedrock in Bukik Lantiak was unknown. The research had done to know the type and the depth of bedrock. Resistivity Geoelectrical Dipole-dipole configuration was used as the method in this research. Interpreted of data had done with Smoothness-Counstraint Least-Square inversion. The research showed that the bedrock in the Bukik Lantiak is igneous rock, namely andesite. The bedrocks is found at a depth of more than 30 meters

Pengembangan prototipe sistem pengukuran KWH meter digital presisi komunikasi dua arah menggunakan short message service berbasis Mikrokontroler AT89S52 dan Atmega16 (Development of a two-way communication precision digital KWH meter measurement system prototype using a short message service based on the AT89S52 and Atmega16 microcontroller) Yosep Permana; - Asrizal; Zulhendri Kamus
PILLAR OF PHYSICS Vol 1 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

ABSTRACTMeasurement system of electrical energy of PLN customers is done manually can cause errors. These Errors can occur when reading the data of KWH meter and entering the data into customer database system. Based on this fact development of automatic KWH meter with Short Message Service is important. Digital KWH meter can measure electrical energy more precise, turn off electricity automatically and turn on it base on a database. In general, this research intend to design and develop a digital KWH meter with measurement system using the short message service with two direction of communication base on microcontroller AT89S52 and ATMega16. The data obtained through measurement is analyzed in two methods, namely by statistics and graphs. There are four results of this research, those are : 1. KWH meter consists of two parts, namely KWH Meter Digital System and System server for database, 2. Accuracy from rotation disk value, KWH value and cost of customer each are 100%, 99.30% and 100%, Precision from rotation disk value and KWH value each are 1 and 0.99, 3. Time to send data KWH to copy into customer database is 37.65s, 4. Time to turn of and turn on KWH meter each are 11.97s and 19.15s. Keywords : KWH meter, optocoupler sensor, short message service

Analysis of seismic changes rate based on the seismotectonic spatial distribution of West Sumatra region Wela Yulianda; Syafriani Syafriani; Ardiyansyah Sabarani
PILLAR OF PHYSICS Vol 9 (2017)
Publisher : Department of Physics – Universitas Negeri Padang UNP

West Sumatra has a high level of seismicity so as often rocked by significant earthquakes and caused damage. The earthquake is usually preceded by symptoms such as occurrence of a seismic Quiescence phenomenon. This phenomenon can be seen by observing seismic rate changes in a region. The observation used data from NEIC / USGS and ISC with time period from 22nd of September 1918 to 31st of October 2015. The method used to analyze the seismic rate changes is the z-value method. The study area is divided into several grids. Z-value of each grid is counted and will be spatially distributed so seismic rate change of West Sumatra can be analyzed. This analysis will show presence or absence of seismic Quiescence phenomenon before earthquake in West Sumatera. The observation result showed that there is a certain preceding phenomenon before the significant earthquake in 1943 (7.8 SR) and 2007 (7.8 SR) in West Sumatra. This phenomenon called seismic Quiescence can be used as earthquake precursor. At the beginning of 2015 showed the decrease in seismic activity in several regions in West Sumatra according to development of seismic activity data. It is suspected as early symptoms of impending significant earthquake in future

PENGARUH VARIASI KOMPOSISI PASIR POZZOLAND DAN PASIR ALAM TERHADAP KUAT TEKAN DAN KUAT LENTUR BATA RINGAN Hermila Hermila
PILLAR OF PHYSICS Vol 3 (2014)
Publisher : Department of Physics – Universitas Negeri Padang UNP

The purpose of this research is to investigate what is the variation of composition between pozzoland sand and natural sand as bricklayers light material that can result in compressive strength and flexural strength best. In this study, the method used is the experimental method, the independent variable in this study is a variation of composition pozzoland sand and natural sand sieve no.8 bricklayers light. The making of sample is done by testing the compressive strength and flexural strength from the age of 14 days, 21 days, and 28 days. From this research found the effect variations in composition pozzoland sand and natural sand in the manufacture of lightweight brick is the more variations in composition of pozzoland sand then natural sand, so compressive strength and flexural strength lightweight bricks produced is increasing, and the higher the age of light brick, so the compressive strength and strong bending is also increasing. It means the pozzoland sand greatly affect the compressive strength and flexural strength in a lightweight brick. Keywords: Sand pozzoland, natural sand, compressive strength, flexural strength, lightweight bricks

Sintesis lapisan hydrophobic nanokomposit mangan oksida/polystyrene (MnO2/PS) untuk aplikasi self cleaning (Synthesis of manganese oxide / polystyrene nanocomposite hydrophobic coating (MnO2 / PS) for self cleaning applications ) Tia Adriany Putri; - Ratnawulan; - Ramli
PILLAR OF PHYSICS Vol 11, No 2 (2018)
Publisher : Department of Physics – Universitas Negeri Padang UNP

The ability of a self-cleaning surface is widely used as a surface coating such as glass, buildings, textiles, ceramics, and so on. This mechanism is called self-cleaning. The self-cleaning mechanism of the hydrophobic substrate surface is based on the effect of the lotus leaf. The surface of the substrate with a lotus leaf effect makes the impurities accumulated on the surface of the substrate fall due to water repulsion. The purpose of this research is to investigate the synthesis of hydrophobic coating of MnO2 / PS nanocomposites which is expected to be utilized as a surface self-cleaning application. The result of this research is the synthesis of hydrophobic coating of MnO2 / PS nanocomposites shows a large change of contact angle. Where the contact angle increased during the temperature of 25-300 º C, then decreased to 400 ºC.

Fabrication of statical friction coefficient determination system in inclined plane using microcontroler Maisa Fitri
PILLAR OF PHYSICS Vol 4 (2014)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Research has been done to design a system of determination of the static friction coefficient of the object on inclined plane digitally. The purpose of this research is to explain the performance specifications, accuracy and precision of the system. There are three results of this research. First, The system is designed with the surface of the slip object size 8.7 x15 cm and glide plane 9 x 100 cm. Second, average of precision relative sensor accelerometer is 95,58%. Third, average accuration is 0,977

Pembuatan alat ukur kadar gula darah berdasarkan tingkat kekeruhan spesimen urin menggunakan sensor warna TCS230 dan photodioda dengan tampilan LCD (An instrument for blood sugar level based on the turbidity level of the urine specimen using a TCS230 color sensor and a photodiode with an LCD display) Zalmirda Pratiwi; - Hufri
PILLAR OF PHYSICS Vol 13, No 1 (2020)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Blood sugar levels are a major factor of diabetes. Diabetes is a one of a dangerous diseases caused by damage to the working system of the hormone insulin in the body’s metabolism. The diagnosis of blood sugar levels is generally by pricking a finger or arm to take a sample of the patient’s blood. Another method can be used without hurting the patient’s body, which is using a urine sample. Discoloration of the patient’s urine can be detected using the TCS230 color sensor and photodiode. The design of the tool system in this research uses the changes in the color of the urine specimen as a measurement parameter. This research aims to determine the performance and design specifications of the manufacture of blood sugar levels based on the level of urin turbidity using the TCS230 color sensor and photodiode. There are two research results. First, the result of performance specifications is a beam-shaped measuring device consisting of an object box measuring 8,5x6x8 cm3 and an electronic component box measuring 20x10x10 cm3. Second, the result of design specifications are the precision of the tool at 95,95% with a percentage of errors of 4,44% and accuracy of 99,25%.

Karakterisasi jenis mineral magnetik sedimen Gua Di Gua Liang Luar Kabupaten Manggarai Barat Provinsi Nusa Tenggara Timur menggunakan metode X-Ray Diffraction (XRD) Daris Maradelta
PILLAR OF PHYSICS Vol 7 (2016)
Publisher : Department of Physics – Universitas Negeri Padang UNP

The investigation types of magnetic minerals cave sediment in Liang Luar Cave Kabupaten Manggarai Barat Provinsi Nusa Tenggara Timur using X-Ray Diffraction. The measurement results in the form of diffraction angle (2θ), the distance between the field (dhkl), diffraction intensity (I) and relative intensity. The analysis techniques have been used Hight Score Plus Software analysis and manually. The results of measurement data of cave sediment samples in Liang Luar Cave show that the cave sediment samples containing magnetic minerals. The type of magnetic minerals contained in the cave sediment samples are magnetite, hematite, maghemite, and ilmenite in the cave sediment samples LS11-C3. This indicates that the inconsistencies type of magnetic minerals in each layer of cave sediment in Liang Luar Cave Kabupaten Manggarai Barat Provinsi Nusa Tenggara Timur. While the grain size of magnetic minerals cave sediment samples in Liang Luar Cave is the single-domain (SD) with a size of ≤ 100 nm

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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