Garuda - Garba Rujukan Digital

Article Per Year (5 Year)

All

Pillar of Physics: Jurnal Berkala Ilmiah Fisika

fis
Website

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 15 Documents

1 2

Search results for , issue "Vol 10 (2017)" : 15 Documents clear

Analysis of Fe3O4 thin film optical properties prepared from the iron sand of Tiram Beach, Padang Pariaman Regency, West Sumatra using sol-gel spin coating method. Nidya Yulfriska; Ramli Ramli; Yenni Darvina
PILLAR OF PHYSICS Vol 10 (2017)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Research on magnetic oxide is growing very rapidly. This magnetic oxide can be found in nature that is iron sand. Iron sand is a deposition of sand containing iron ore that many exist along the beach. One of the beaches in West Sumatra containing iron sand is Tiram Beach, Padang Pariaman District, Sumatera Barat. The content of iron sand is generally in the form of magnetic minerals such as magnetite, hematite, and maghemit. Magnetite contained in iron sand has excellent properties that can be developed into thin films that can later be applied to magnetic sensors. The purpose of this research is to investigate the optical properties of the Fe3O4 thin films, prepared from iron sand of Tiram Beach, Padang Pariaman District, Sumatera Barat by Sol-Gel Spin Coating Method. This type of research is an experimental research. The iron sand obtained from nature is first purified using permanent magnets, then made in nanoparticle size using the HEM-E3D tool. Then, the process of making thin film with sol-gel spin coating method. In this research variation of rotation speed of spin coating is 1000 rpm, 2000 rpm, 2500 rpm and 3000 rpm. The characterization tool in the research of optical properties analysis used is UV-VIS Spectrophotometer. The value of transmittance is 32,1%, 32,2% and 32,7% respectively. The absorbance value is 96,721% - 31,247%, 95,428% - 33,785% and 93,54% - 33,551% respectively. While the reflectance values are 33,2%, 33,7% and 34,2%, respectively. So it can be concluded that the greater the speed of rotation the thickness of the thin layer will be smaller, resulting in the transmittance and reflectance will be greater, while the absorbance will be smaller. Energy gap obtained from this research is 3,75 eV, 3,75 eV and 3,74 eV. So the average energy gap obtained is 3,75 eV

Effect of milling time on magnetite (Fe3O4) crystal structure made from volcanic minerals from Mount Talang, West Sumatra Yuli Pratiwi; Ramli Ramli; Ratnawulan Ratnawulan
PILLAR OF PHYSICS Vol 10 (2017)
Publisher : Department of Physics – Universitas Negeri Padang UNP

The available of iron sands in west sumatera only exploit in raw condition (raw material) so that the value of sell is low. One of solution to make higher value of sell is knowing it’s characteristic. Iron sands characteristic can be known based on crystal structure, the size of crystal and magnetite structure from iron sands around Kecamatan Lembah Jaya, Kecamatan Gunung Talang and Kecamatan Danau Kembar, Kabupaten Solok, Provinsi Sumatera Barat as the resut of milling time variation. This research aim are to investigate the influence of milling time to magnetite crystal and investigate the influence of milling time to size of magnetite crystal using X-Ray Diffraction. This is experiment research that have been done in Material Laboratory of Physics Departement. In this research, there is a variation of time milling. X-Ray Diffraction (XRD) is used in identification of structure dan size of crystal. X-Ray Flouresence (XRF) is used in gather the data of magnetite level in iron sands before and after milling. The result of this research shows that increasing time milling caused the change of fasa from hematite to magnetite. Increasing time milling variation cause the change of magnetite structure from rhombohedral to cubic structure. Increasing the time milling cause size of magnetite crystal increase up to certain time milling and then decrease, then some keep increase again. Such as a magnetite crystal before milling, 88,01 nm and after milling in 25 hours it becomes 71,10 nm, milling in 30 hours it becomes 78,63 nm. In 35 and 40 hours of milling, it decreases to 55,42 and 49,86 nm. In 45 hurs milling, it increases to 66,25. The smaller the size of crystal, the magnetite particle can be used as heavy metal binding that present in waste

Analysis of Fe3O4 thin film electrical properties prepared from iron sand at Tiram Beach, Padang Pariaman Regency, West Sumatra by using the sol-gel spin coating method Fitria Murti; Ramli Ramli; Yenni Darvina
PILLAR OF PHYSICS Vol 10 (2017)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Indonesia is a country that has a considerable amount of mining products such as iron sand that can be found along the beach, one of them is the Tiram Beach in Padang Pariaman district, West Sumatera. Iron sand can be applied to electronics, computing, and the automotive industry sector because it contains magnetic material. Magnetite iron sand is iron oxidation which has the strongest magnetic characteristic, which is made in nano size has ferromagnetic characteristic and has a wide application, the development of ferrite materials in the form of thin layer oriented to recording media and also can be used as a magnetic sensor device. The research is to inquire effect spin coating velocity on conductivity of thin layer.In the research, variation of spin coating velocity 1000 rpm, 2000 rpm, and 3000 rpm are done with the time of 60 seconds toward magnetite gel solution which has been sol-gel, after rotated then the thin layer formed is measured by using four point probe method. The result from research obtained conductivity value that is on velocity 1000 , 2000, and 3000 rpm conductivity value shows that the effect of spin coating velocity on the magnetite thin layer conductivity that is the higher it is spin coating speed, the higher it is the conductivity

Cover, Editorial Team and Table of Content Pendahuluan Jurnal
PILLAR OF PHYSICS Vol 10 (2017)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Cover, Editorial Team and Table of Content

Fabrication of digital linear expansion experiment set based on the ATMEGA328 microcontroller Nofsi Meiza; Yulkifli Yulkifli; Zulhendri Kamus
PILLAR OF PHYSICS Vol 10 (2017)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Development of science and technology can’t be separated from physics. Basically physics is born and grow doing by experiments. For more accurate results of the research, required experiments with the level of high accurate. In the laboratory, experimental linear expansion is analog. Results of analog eksperiment has an error. This research has purpose for determine the performance specifications and desain of digital microcontroller atmega328. Based on research results obtained, first meansure of experiments digital linear expasion process in output sensor and changing obtained with the expected output. Result of experiment digital is displayed with LCD. Sensor used is LM35 temperature sensor of metal, brass, and iron. Second, experiment digital for linear expansion has the percentage of precision in brass, iron, and aluminum respecteli is 97.58%, 95.92%, and 97.98%. While for precision is 0.97, 0.95, and 0.97

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

Synthesis and characterization of Al2O3 nanoparticles using sol gel method by chelating extracts of starfruit (Averrhoa bilimbi) for nanofluid applications Kharisma Marta Judenta; Ratnawulan Ratnawulan; Gustaman Syarif
PILLAR OF PHYSICS Vol 10 (2017)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Nanofluid has better thermal characteristics and better heat transfer coefficient compared to conventional coolant fluid [6].This makes the nanofluids has potential as a good alternative coolant fluid compared conventional coolant fluid. Nanofluids are a mixture of basic fluids such as water with solid particles of size 1-100 nm (Nanoparticles). In this study the nanoparticles to be used are Al2O3. The synthesis of Al2O3 was conducted by sol gel using chelation of Averrhoa bilimbi with calcination temperature of 1100 for 3 hours. Al2O3 powder obtained then characterized by using XRD. Furthermore, Al2O3 nanoparticles mixed into 100 ml of distilled water with concentration variations 0,2%; 0,5% dan 0,8% and characterized using test equipment Viscosity, Zeta Potential meter and Critical Heat Flux (CHF). Results obtained in the study was the effect of the addition of Averrhoa bilimbi extract as chelating against nanoparticles of Al2O3 to prevent agglomeration/buildup on each other. XRD data showed that the Al2O3 nanoparticles has crystallite size of 10,40 nm. Then the effect of addition Al2O3 nanoparticle concentration that were suspended in 100 ml of distilled water to the value of fluid Viscosity, Zeta Potential and Critical Heat Flux.Viscosity increases with the addition of Al2O3 nanoparticle concentration, at the same temperature (27°C) of optimum viscosity value at 0.8% concentration of 0.9830 mPa.s. Meanwhile, the potential zeta value also increases with the addition of Al2O3 nanoparticle concentration. The zeta potential value is optimum at 0.8% concentration of 35 mV. Furthermore the value of CHF at a concentration of 0.2%; 0.5% and 0.8% were 17.29%; 77.04% and 76.70% for each. Overall the value of CHF increases with the addition of Al2O3 nanoparticle concentration

Analysis of earthquake precursors in the West Sumatra region based on a magnetic data acquisition system in July 2016-March 2017 Rahmi Yulyta; Syafriani Syafriani; Ma'muri Ma'muri
PILLAR OF PHYSICS Vol 10 (2017)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Sumatra is one of the most actives seismic islands in Indonesia. West Sumatra as a part of Sumatra, in recent years frequent earthquakes in West Sumatra so many casualties and destroyed thousands of buildings. Until now no one can be sure when the earthquake occurred. Although earthquakes can not be predicted certainty, But the signs of earthquake events can be identified by observation, One of them changes to the earth's magnetic field. Changes in the earth's magnetic field can be identified using the Magnetic Data Acquisition System (MAGDAS). Polarization Power Ratio Z / H is one of the methods used in analyzing changes the variation of earth's magnetic field on component Z and component H. This anomaly change will be adjusted to earthquake occurrence. The results showed that there has been anomalous earth magnetic field 1 day to 1 month before earthquake. Some positive-valued Anomalies indicating rocks experienced strains as of January 11, 2017 corresponding to the earthquake of January 30, 2017 located at -1.87 LU and 98.97 BT with magnitude 4.5 SR, within 19 days after the anomaly. Negative anomalies indicated stress-affected rock as of July 25, 2016 corresponding to the earthquake of August 3, 2016 located at -1.33 LU and 96.86 BT with magnitude 4.7 SR, within 9 days after the anomaly.

Design simulation of microstrip array antenna with low sidelobe level for synthetic aperture radar sensor Alvissda Damai; Asrizal Asrizal; Yohandri Yohandri
PILLAR OF PHYSICS Vol 10 (2017)
Publisher : Department of Physics – Universitas Negeri Padang UNP

The simulation of design of rectanglemicrostrip array antenna is presented in this paper. The proposed antenna is designed operate in 1.27 GHz (L-band) and consists of three element of the patch. The CST Studio Suite is employed in this simulation to optainethe low sidelobe level. This work aimed to produce the satisfyantenna characteristics for the SAR sensor. The low sidelobe level of the antenna is generated using Taylor Line Source method. Based on the simulation result, the antenna parameter such as S11, VSWR, impedansi (z) is -29.74 dB , 1.06, 50.05 ohm, respectively. the magnitude mainlobes = 11.3 dB and value side lobe level for Ө = -60o is 16.6 dB, and for Ө = 60o is 20.3 dB. The results of this simulation enough to fulfill characteristic antennae mikrostrip array with a lobes side greater than 15 dB.

The effect of milling time on magnetite (Fe3O4) crystal structure made from volcanic minerals gathered from Mount Marapi, West Sumatra Maya Sri Anggraini; Ramli Ramli; Hidayati Hidayati
PILLAR OF PHYSICS Vol 10 (2017)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Indonesia is one of the archipelago countries rich in the abundant natural resources potential one of them is iron sand. Iron sand can be found in Mount Marapi located in West Sumatera Indonesia.Gunung is classified as the active volcano in Sumatra located in the district Agam. The existence of iron sand is only in the exploitation in the raw state (raw material) so it has a high selling value that is by knowing its characteristics. The characteristics of iron sand based on Crystal structure, the size of crystals and know the magnetite elements of iron sand that exist in the region Agam regency. This research is a type of experimental research conducted in the Materials Laboratory of Physics Department. In this study variations were performed on milling time. X-Ray Diffraction (XRD) is used to identify the phase, structure and size of crystals. X-Ray Fluorescence (XRF) is used to obtain data of magnetite content in iron basest before and after milling. In this study obtained XRD test data that due to increased time milling phase changes from hematite to magnetite. The increasing variation in milling time causes the change of magnetite structure from cubic structure to cubic structure. Increased milling time, magnetite crystal size increases up to a certain milling time and then decreases. As in the magnetite crystals before dimilling, 1.08 nm, after dimilling with 25 hours, 30 hours, 35 hours and 40 hours variations were obtained at 1.14 nm, 1.20 nm, 1.23 nm and 1.61 nm respectively. Furthermore, there was a decrease in the variation of mill-ing time of 45 hours obtained by 1.29 nm

Page 1 of 2 | Total Record : 15

1 2

Filter by Year

2017 2017

Filter By Issues

All Issue Vol 16, No 2 (2023) Vol 16, No 1 (2023) Vol 15, No 2 (2022) Vol 15, No 1 (2022) Vol 14, No 2 (2021) Vol 14, No 1 (2021) Vol 13, No 2 (2020) Vol 13, No 1 (2020) Vol 12, No 2 (2019) Vol 12, No 1 (2019) Vol 11, No 2 (2018) Vol 11, No 1 (2018) Vol 10 (2017) Vol 9 (2017) Vol 8 (2016) Vol 7 (2016) Vol 6 (2015) Vol 5 (2015) Vol 4 (2014) Vol 3 (2014) Vol 2 (2013) Vol 1 (2013) More Issue

Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

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

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

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

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

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