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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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Optimasi kecepatan putar pengadukan dan waktu pengadukan terhadap kualitas fisika biodiesel dari minyak kelapa Riny Andwika Simatupang
PILLAR OF PHYSICS Vol 7 (2016)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Nowadays, the quantity of fuel in the nature almost depleted. This condition make us to find another alternate energy source as a solution of fuel limitation.Using the organic material like cocoa plant as a renewable fuel that is biodiesel, to replace the diesel. This research goal is to know the optimum point of velocity of stirrer and stirring duration so it could produce fine quality of biodiesel as alternative energy source. In this research, the free variable that applied to the mixer as stir velocity is 1050 rpm, 1100 rpm, 1200 rpm and stir duration is been done in 5, 10, 15, 20 and 25 minutes. For controlled variable like process temperature is 50◦C, with sedimentation time is 24 hours and using NaOH as catalyst Biodiesel that been produce from transesterification from coco oil, having viscosity point at 4.408 cSt, density at 872.995 kg/m3 and flashpoint > 100◦C. The condition obtain from stirrer that using speed 1100 rpm on 5 minutes as the stirring time

Simulation of circular polarized microstrip antenna for circularly polarized - synthetic aperture radar (CP-SAR) Bastian Wahyudi; Asrizal Asrizal; Yohandri Yohandri
PILLAR OF PHYSICS Vol 9 (2017)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Remote sensing technology is important to determine the geography information. Based on the sensor used, remote sensing can be divided into two types namely optical and radar. Radar-based remote sensing is more suitable for use in parts of Indonesia when compared to using an optical sensing, because of Indonesia has a large enough cloud cover. One type of radar sensor is a sensor Synthetic Aperture Radar (SAR). SAR sensors are generally operated in the linear polarization. When propagating in the ionosphere, micro wave with linear polarization will be disturbed by the effects of Faraday rotation. The impact of the effects of Faraday rotation can be reduced by emitting microwaves in circular polarization -CP. The signal quality of the CP can be described by a parameter called axial ratio. This study simulates antenna design to determine the effect of the dimensions of the antenna on the antenna characteristics. The simulation was performed by varying the length of the patch, the width of feeding and truncated junction on the patch antenna. Antenna dimension is obtained will be used as a reference in determining the dimensions of the antenna for the CP-SAR. The device used in this simulation is IE3D with the type of substrate pillar packing (NPC-H220A) with 2,17 dielectric constant of 3,2 mm thickness and loss δ = 0.0005. From the simulations, it can bestated two of research result. First, that the correlation between the length of the patch and the operating frequency of the antenna is comparable as well as the width of feeding and the input impedance. Second, the antenna dimensions are used to determine the model of the characteristics of the antenna for applications CP - SAR at 1,270 GHz operating frequency with a value of 50,54 Ω input impedance, VSWR of 1,053 and 1,1288 dB axial ratio

IDENTIFIKASI MINERAL MAGNETIK PADA GUANO DI GUA BAU-BAU KALIMANTAN TIMUR MENGGUNAKAN SCANNING ELECTRON MICROSCOPE (SEM) Tauhida Amalia Sari
PILLAR OF PHYSICS Vol 3 (2014)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Change of environment of a cave can be seen from the presence of magnetic minerals in guano. In this research the magnetic minerals identified a Guano in Bau-Bau caves, East Kalimantan. This research aim to look the morphology, elemental composition, the kind of magnetic minerals, and how magnetic minerals transport into the cave. Magnetic minerals in guano identified by using Scanning Electron Microscope (SEM) that completed with Energy Dispersive Spectroscope (EDS). The result showed the morphology of magnetic minerals of the guano is oval and have some cracks, in addition to the grain size of magnetic minerals is multidomain, guano elements are Fe, O, Ti , Si, C, N, and Br. To determine the kind of magnetic minerals using Proust's Law. The results of calculation the kind of magnetic minerals that can form Hematite (Fe2O3), Magnetite (Fe3O4), Ilmenite (FeTiO3) and Rutile (TiO2). This is indicates the magnetic grains estimated come from the external environment and during the rainy, transportation into the cave. Keywords: Change of environment, magnetic minerals, guano, SEM

Studi percepatan tanah maksimum wilayah Sumatera Barat dengan metode NGA (Next Generation Attenuation) (Study of the maximum soil acceleration of the West Sumatra region using the NGA (Next Generation Attenuation) method ) Sandra Gusdalina; - Syafriani; - Ma’muri
PILLAR OF PHYSICS Vol 11, No 2 (2018)
Publisher : Department of Physics – Universitas Negeri Padang UNP

West Sumatera is an earthquake prone area because it is in the active subduction zone between the Indo-Australian plate and the Eurasian plate. In addition, West Sumatera is also traversed by the Sumatera fault system, which consists of four active fault segments, namely the Sumpur segments, the Sianok segment, the Sumani segment and the Diffi segment. From every earthquake that occurs in a place will cause a value of ground acceleration. The maximum ground acceleration value can be determined by direct measurement using Accelerograph or by attenuation formulation such as the Fukushima and Tanaka attenuation formulation (1990) and the Patwardhan attenuation formula. The data used in this study is the PGA Accelerograph value recorded in the February 2013-December 2017 period at the Padang Panjang BMKG. The magnitude used is 3.3-6.2SR and its depth is 2-218 km. the calculated PGA value using the attenuation formula will be compared with the PGA value from Accelerograph. Data processing is done by using three sensors namely Sta. sensor Geof. Padang Panjang. Sta. Met. Ketaping and Sta. Mar Teluk Bayur Padang. Based on the three sensors, the PGA value is calculated based on the formulation of Fukushima and Tanaka (1990) and Patwardhan attenuation according to the coordinates of each sensor. After obtaining the PGA value, the calculation of the attenuation formula was compared with the PGA value recorded by Accelerograph. From the three sensors, it was found that the PGA value calculated using the Fukushima and Tanaka formula (1990) approached the PGA value of Accelerograph. So the formulation of Fukushima and Tanaka (1990) is used to find the value of PGA in the West Sumatera region. Based on the formulation of the Fukushima and Tanaka (1990) attenuation, the city or district was obtained. Which has the highest PGA value in Kab. Mentawai Island. This is because the earthquake that occurs has a shallow depth and distance of earthquake sources close to kep regency Mentawai.

Analysis of ground water distribution using robust constrain inversion determination geoelectric data of wenner configuration type in Bukit Lantiak, Padang Selatan District Silvia Dona Sari
PILLAR OF PHYSICS Vol 4 (2014)
Publisher : Department of Physics – Universitas Negeri Padang UNP

The aimed of this research are to determine the distribution, depth, and types of groundwater aquifers in Bukit Lantiak Padang Selatan area. Distribution of groundwater in Bukit Lantiak are important to know to anticipated landslide cause increase in soil water content in the slope. This research used resistivity geoelectric method of Wenner configuration. Data of this research taken four tracks using ARES (Automatic Resistivity). Interpretation data was done by with Robust Constraint inversion. The results of this research showed that distribution of soil water on Tracks 1, 3, and 4 tend to lead from the Northeast to the Southwest. Distribution of groundwater in track 2 leads from West to East. Into the ground water ranged from 5.76 to 30.2 m were obtained. Type aquifer is an aquifer that is found free and depressed. Free aquifers that can trigger landslides from on track 1

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

Pembuatan pemodelan sistem ground based synthetic aperture radar (GB-SAR) untuk aplikasi deteksi longsor (Making a ground based synthetic aperture radar (GB-SAR) system modeling for landslide detection applications) Fitri Diana
PILLAR OF PHYSICS Vol 7 (2016)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Ground Based Synthetic Aperture Radar (GB-SAR) is used for monitoring the displacement of landslides. Arrangement geometry of GB-SAR depend on the local topography. Calculation parameters of Synthetic Aperture Radar (SAR) system and design of tools developed need to be assessed, so that, we get the key parameters for developing the GB-SAR system matching as needed. The purpose of this research are to simulate the modeling of GB-SAR system towards the target area and resulted in the formulation of the reduction in SAR system and geometry of the illustration geometry of GB-SAR system. In general, appearance this modeling consists of two parts which are an application program and graphic modeling. GB-SAR modeling is developed based on software GUI Matlab. Variables in this research are slope hill angle, a distance of sensor to the target and bandwidth. The results of this research consists of three parts, namely the results of the formulation parameters GB-SAR geometry which are slant range center, maximum and minimum slant range, ground swath, image size, n synthetic aperture length, the next result is shape modeling GB-SAR system, and the relation between of each parameter. GB-SAR system modeling suggests that the relation between distance to the slant range and ground swath is linear proportional, while the slope hill angle is inversely proportional. In other side Relation of ground resolution with bandwidth is inversely proportional and relation ground swath with slope hill angle is linear proportional

Pengaruh pengukuran sifat fisis dan sifat mekanis papan partikel sampah daun kering berdasarkan ukuran butir (The effect of measuring the physical properties and mechanical properties of the dry leaf waste particleboard based on grain size) Ade Usra Berli; Yenni Darvina; - Yulkifli
PILLAR OF PHYSICS Vol 1 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

ABSTRACT Utilization of leaf waste processed a drop of without development in the processing. The thought of leaf waste can be processed to become products of economic value, one used as raw material similar lightweight particle board, particle board can be used as a substitute for wood. Particle board manufacturing is done by printing the leaf waste that has been mixed with a binder or adhesive. Adhesives used as binder is polyvinyl acetate (PVAC). Leaf waste material made with a variety of different grain sizes are 1.7 mm, 2.8 mm and 4.75 mm. Particle board manufacturing process is done by inserting the material into the machine hot press with pressure 330 x 104 kg/m2 at 100 ° C for 20 min. From the testing of physical and mechanical properties, obtained the following results: for the physical properties of particle board dry leaf waste, the small grain size of particle board then dried leaf waste moisture content decreases while the value of the density and thickness development is increasing. For the mechanical properties of particle board, the small grain size of particle board then the value of flexural strength and compressive strength increased. Test results obtained water content and density to meet the Standar Nasional Indonesia (SNI 03-2105-2006), while the value of developing strong and thick flexible does not meet the Indonesian National Standard (SNI 03-2105-2006). For compressive strength values no set of Standar Nasional Indonesia. Grain size optimal particle board in this study is the size of a small grain size of 1.70 mm. Keywords: Leaf of Mangoes, polyvinyl acetate (PVAc), Particle board

Relokasi hiposenter gempabumi Sumatera Barat menggunakan metode double difference (DD) Anggina Wulan Dari
PILLAR OF PHYSICS Vol 8 (2016)
Publisher : Department of Physics – Universitas Negeri Padang UNP

West Sumatra is located in an active subduction zone between the Indo-Australian plate with the Eurasian Plate and is along the Sumatra fault, so the West Sumatra earthquake prone. One way to understand the tectonic conditions of this region by relocating the earthquake hypocenter. Earthquake hypocenter result of BMKG has some weaknesses due to the program that used (SeiscomP) has a minimum depth of 10 km (fixed depth).Beside that velocity model of P wave which used by the system does not match with the actual geology condition of Sumatra Barat. The data used for the relocation of the hypocenter are taken for BMKG analysis system SeisComP the until period 1 May 2009 to 30 November 2015 by using HypoDD program with double difference method in it. AK 135 and Madlazim wave velocity model are used in the program. Double Difference method. So the velocity model errors can be minimized without using correction station. The results indicate earthquake hypocenter relocation in West Sumatra related to the fault, subduction process and Mentawai fault. The data relocation many as 1181 of the 1622 data. Based on the data obtained by percentage depth to a shallow earthquake relocation 79.3%, 45% intermediate earthquake and the earthquake in 0%. This is due to the deeper the layer, the higher the P wave velocity, so that the structure of the constituent layers will be more complex. Besides the depth of the earthquake below 10 km (fixed depth) after relocation has a variety of different depths. Earthquakes before relocating spread out so the (trendline) can not show a pattern corresponding to the main fault. Once relocated the (clusters) to form a group on the trend of the field fracturing or similar structure and distribution of earthquakes portrayed clearly. The RMS value after the relocation ranges between 0-1.5 and the RMS value before relocating ranging between 0-5

PEMBUATAN SISTEM PENGUKURAN DURASI PENYINARAN MATAHARI BERBASIS MIKROKONTROLER ATMEGA8535 MENGGUNAKAN SENSOR LDR Ridho Pratama
PILLAR OF PHYSICS Vol 2 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Abstact-The purpose of this reseach was to make measurement system of the sunshine duration based on microcontroller ATMEGA8535 which used LDR sensor. This system was expected to measure light intensity and sunshine duration with good performance and design specifications. The collection of data was done directly and indirectly measurement. Direct measurements were done to get output voltage, light intensity and sunshine duration. Indirect measurements were done to get accuracy and precision of system. Performance specifications of this system were built by power supply, LDR sensor, voltage divider circuit, microcontroller ATMEGA8535, and LCD. While design specification consist of five result. First, output voltage was logaritmic of light intensity. Second, on the first day there were three intervals duration of sunshine with a total sunshine duration was 184 minutes, while on the second day there were three interval duration of sunshine with a total sunshine duration was 440 minutes. Third, the accuracy measuring of the light intensities was 97.145%. Fourth, the precision measuring of the light intensities was 0.965. Fifth, the accuration measuring of the sunshine duration was 93.64%. Keyword: System, Sensor, LDR, Sunshine Duration, Microcontroller

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Home Page

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Contact Name Syafriani

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

Location Kota padang, Sumatera barat INDONESIA

Abstract

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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