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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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Pembuatan set eksperimen gerak jatuh bebas berbasis mikrokontroler dengan tampilan PC (Making a set of free fall motion experiments based on microcontroller with a PC display) Yohanna Dasriyani; - Hufri; - Yohandri
PILLAR OF PHYSICS Vol 5 (2015)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Experiment of free fall motion is one of phenomena in physic. Parameters of free fall motion still measured by stopwatch and meter. The purpose of research is development of free fall motion experiment set based on microcontroller with personal computer display. This instrument have highest precision and accuration. Average of measured result is 9,821 ± 0,025 with average of precicion relatif is 98,3% and average accuration is 0,992

Analysis of Ground Shear Strain (GSS) district Kawalu Tasikmalaya with HVSR method using microtremor data Muhammad Reza Iswara; - Syafriani; Thomas Hardy
PILLAR OF PHYSICS Vol 13, No 2 (2020)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Tasikmalaya is one of the areas affected by the earthquake. One of efforts to reduce the impact of the earthquake is by analyzing seismic hazard levels as one of the earthquake disaster mitigation efforst with the microtremor method. It can determine the amplification value and the dominan frequency. From the dominant frequency value and amplification can be calculated. Seismic vulnerabilities index (Kg) and value of Ground Shear Strain (GSS). From the value of vulnerability index (Kg) and ground shear strain (GSS) can be known how much the level of vulnerability of the area to earthquakes. Furthermore, a spatial description of the distribution map of the seismic vulnerability index (Kg) and the ground shear strain value distribution map (GSS) were made in Kawalu Subdistrict, Tasikmalaya City. The dominant frequency value is obtained from 0.6 Hz to 16.7 Hz. The seismic vulnerability index (Kg) from Kawalu Tasikmalaya ranges from 0.2 to 20, and the GSS value from the low is 0.17 in the village of Urug to the highest of 12.13 in the village of Leuwiliang. This allows Kawalu Subdistrict to get a deformation phenomenon such as liquefaction, landslides when earthquake.

Analisis hubungan angin zonal dan angin meridional lapisan 850 milibar terhadap curah hujan di Sumatera Barat Lili Sartika
PILLAR OF PHYSICS Vol 8 (2016)
Publisher : Department of Physics – Universitas Negeri Padang UNP

This study was conducted to determine the effect of zonal wind and meridional wind layer 850 millibars to rainfall in Sumatra Barat. Additionally, it also obtained the pattern of both zonal wind and meridional wind that give impact to rainfall in West Sumatra. This study used rainfall data that were taken monthly, wind zonal and meridional winds of 850 millibars layer equivalent to 1.4 km from 1998 to 2015. Defining relationships zonal wind and meridional wind on the distribution of posts precipitation of rain in three regions, ie the waterfront area, mountainous regions and areas behind the mountains. The division of this region to give a picture of wind patterns that affect rainfall in West Sumatra. Influence of zonal wind and meridional wind to precipitation was analyzed using canonical correlation analysis using software Climate Predictability Tool (CPT). while to see the patterns of wind zonal and meridional wind using software The Grid Analysis and Display System (Grads) version 2.0. The result showed zonal wind relation to rainfall resulted in moderate correlation in March with a correlation coefficient (r = 0.45) whereas the meridional wind has a low correlation (r = 0.37). In November of zonal wind has a low correlation with a correlation coefficient (r = 0.36) compared to the meridional winds that showed a strong correlation (r = 0.60). So rainfall that occurred in West Sumatra is predominantly influenced by the zonal wind in March, while in November more influenced meridional wind. Meanwhile, wind patterns that affect rainfall in West Sumatra have equatorial wind pattern and the pattern of the monsoon

PENDAHULUAN JURNAL Daftar Isi Daftar Isi
PILLAR OF PHYSICS Vol 1 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Cover, Dewan Redaksi, Daftar Isi

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

PERHITUNGAN TINGKAT ENERGI SUMUR POTENSIAL KEADAAN TERIKAT MELALUI PERSAMAAN SCHRODINGER MENGGUNAKAN METODE BEDA HINGGA Hanifah Rahmayani
PILLAR OF PHYSICS Vol 3 (2014)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Schrodinger equations are widely used in solving a variety of problems, one of them is particles in a box in especially of potential wells bound state. Particle in a box is a discrete circumstances, so we must examined whether or not the degeneration of these particles. The Schrodinger equation analysed to get a form of modeling of energy levels and wave functions in potential wells of the circumstance used numerical method. We also can show energy level of each state from the model. The numerical approaches is finnite difference method using Matlab R2010 software. Numerical calculation shows k value. k1 and k3 gets from solution of cos equation, whereas k2 and k4 gets from solution of sin equation. The k value is used to know the energy level in potential wells. energy level model show wave fucntion. In potential well bound state, Energy level and wave functions be smaller when potential energy is high and it is high when potential when potential energy is small. When wide of potential well is smaller, energy level and wave function be smaller too. But there isn’t show energy level and wave function when wide of potential well is high. The shape of energy level and and wave function of particle in box.

Analisis sifat magnetik nanokomposit CoFe2O4/PANi yang disintesis dengan metoda sol-gel (Analysis of the magnetic properties of the CoFe2O4 / PANi nanocomposites synthesized by the sol-gel method) Rigis Sugianti; - Ramli; - Ratnawulan
PILLAR OF PHYSICS Vol 12, No 1 (2019)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Cobalt ferrite (CoFe2O4) is a hard magnetic material known for its high coercivity and moderate magnetization, these properties together with great physical and chemical stability, making cobalt ferrite suitable for magnetic sensor applications, magnetic recorders and magnetic sensor building materials. In the field of material, one of the materials that is widely developed today is composite material. CoFe2O4 / PANi nanocomposite was successfully synthesized using the sol-gel method and the growth of CoFe2O4 / PANi nanocomposite layer using spin coating was characterized using X-ray Diffraction to see the size of the Crystal, FTIR test saw the functional group, SEM test to see film thickness. Magnetic properties were analyzed, hysteresis curve obtained remanent magnetization, saturation magnetization and coercivity field. In the experiment there were 5 variations of composition by using CoFe2O4 concentrations in PANi, namely 20%, 30%, 35%, $ 0%, 50%. Based on XRD data, the crystal size of each concentration is 50.7 nm, 20.3 nm, 33.7 nm, 201.4 nm, 194.4 nm. SEM test is 16.4 nm, 50.8 nm, 128.2 nm, 36.8 nm. VSM test obtained hysteresis curve from the curve then obtained saturation magnetization is 12.10, 6.69, 10.77, 5.78, 3.56 (memu), remanent magnetization is 2.39, 1.54, 2.08, 1.91, 1.22 (memu), the coercivity field is 253.31, 353.80, 312.29, 377.76 (Oe).

Pembuatan program aplikasi untuk menentukan modus pandu gelombang raised-strip dari devais fotonik (Creation of a program to determine the waveguide mode lifted from the photonic device) Genov Zulmartin; - Hidayati; Pakhrur Razi
PILLAR OF PHYSICS Vol 5 (2015)
Publisher : Department of Physics – Universitas Negeri Padang UNP

In the integrated optical system (Integrated Optics), the raised-strip waveguide is part of the photonic divices used as a medium of light propagation. Physical parameters of raised-strip waveguide mode waveguides affects that can be passed on the waveguides. Given the relative complexity of the calculations - calculations in determining the number of waveguide modes, in this research, and numerical analysis made in an application program in order to facilitate the determination of the waveguide mode. Research conducted including descriptive research using a numerical approach. Used numerical approach is the bisection method is an ideal method to find a result with the use of iterative or repetitive calculations. Furthermore, with this method using Matlab software program designed 2007. Were run on the Windows XP operating system based on research conducted in the form of GUI matlab program that displays the dispersion curves. Generated that variations in physical parameters such as refractive index, thickness and wavelength lebal films and give effect to the number of raised-mode strip waveguides of photonic divices. Where the greater the difference in the refractive index is given, the more the mode waveguides can be missed.

Rancang bangun tirai otomatis menggunakan sensor cahaya dan remote control (A design of automatic blinds using a light sensor and remote control) Desvita Roza; - Hufri
PILLAR OF PHYSICS Vol 13, No 1 (2020)
Publisher : Department of Physics – Universitas Negeri Padang UNP

The development of science and technology that is increasingly advanced is widely used by humans to meet human needs. This rapid technological development is marked by the number of equipment that has been created and operated both manually and automatically. Utilization of an automatic control system in the context of smarh home can be applied to the curtain and light media that exist in every home. The purpose of this study is to determine the performance specifications and design specifications of an automatic curtain using a light sensor and remote control.This research is included in engineering research. This study explains the specifications of performance and specifications for automatic curtain design. Performance specifications describe the functions of automatic curtain tool builders, while design specifications explain the accuracy and accuracy of the tools. The measurement technique is done directly and indirectly. Direct measurements are carried out on the voltage value, while indirect measurements are carried out by analyzing the accuracy and accuracy of the automatic curtain tool. The sensor used is the LDR sensor. The results of the study of performance specifications and design specifications. First, the performance specifications of the automatic curtain consist of the LDR sensor, remote control, curtain drive, and electronic circuit builder of the automatic curtain system. The LDR sensor used is the LDR sensor with a maximum resistance of 50kΩ. The second result, the results of the design specifications of this study consisted of accuracy and accuracy. The accuracy value of the automatic curtain tool is 99.16% and the accuracy value is 98.98%

Antena array beam steering untuk sensor synthetic aperture radar (SAR) pada unmanned aerial vehicle (UAV) menggunakan software IE3D Herli Mia Haqu
PILLAR OF PHYSICS Vol 7 (2016)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Sensor Synthetic Aperture Radar (SAR) work using the side looking of the system that is useful to distinguish the signal reflections from the left side or the right side at the same distance from the surface of the object or target. SAR sensors are taken using Unmanned Aerial Vehicle (UAV) and mounted on one side of the plane that caused the UAV requires a load balancer. One way to overcome this is to install the antenna under the fuselage, the radiation to be emitted toward the side known as beam steering antenna techniques. This study simulates the design of the antenna array to determine the influence of the dimensions of the antenna on the characteristics of the antenna array. Simulations carried out by varying the length and width of the feeding patch antenna array. The influence of the dimensions antenna on the antenna characteristics are used as a reference in determining the dimensions of the antenna array beam steering antenna characteristics for SAR sensors on the UAV. The software is used in this simulation software IE3D with the type of substrate pillar packing (NPC-H220A) having a dielectric constant of 2.17, thickness of 3.2 mm and a loss δ = 0.0005. Results of this research showed that the greater the length of the patch then it works the lower frequencies and viceversa. While wide-feeding affect the size of the antenna input impedance of the greater width of feeding the input impedance greater viceversa. Based on simulation results that have been done of the obtained reflection coefficient -18.01 dB antenna beam steering with 20° at a frequency of 1.270 GHz, the simulation results satisfy for the antenna of SAR sensors on the UAV

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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