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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 270 Documents

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Komputasi energi elektronik pembentukan kitosan dari kitin cangkang udang dan pengaruhnya akibat keberadaan logam berat Bayu Fernanda
PILLAR OF PHYSICS Vol 7 (2016)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Shrimp waste in the form of skin, head and tail of a substance containing protein and chitin can be processed into chitosan which has many uses. Chitosan is obtained from chitin which is reacted with NaOH. Chitosan can be processed and used as an absorbent material heavy metals generated by industrial waste. Owned energy chitosan obtained by Ev 798,4. However kitosani formation process, and how the influence of the presence of heavy metals to the energy can not be explained. Based on that, the purpose of this study was to determine the change in potential energy and activation energy in the formation of chitosan and the influence of the presence of heavy metals to energy chitosan.This research was a theoretical study that uses CS software Chemoffice and winmopac to see the chitosan molecular electronics and pengruh heavy metals. Using this software obtained data such as the distance between molecules, molecular charge and potential energy at the time of formation of chitin chitosan reacted with NaOH. Then chitosan is reacted with heavy metals, from here will be visible effect of heavy metals on the energy chitosan

Cover, Dewan Redaksi, Daftar Isi Pendahuluan Jurnal
PILLAR OF PHYSICS Vol 8 (2016)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Cover, Dewan Redaksi, Daftar Isi

Pembuatan Program Aplikasi Untuk Analisis Persamaan Nonlinier Sine Gordon pada Long Josephson Junction Bahan Superkonduktor dengan Menggunakan Metode Finite Difference Wellya Sari
PILLAR OF PHYSICS Vol 2 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Josephson junction consists of two superconductor materials seperated by a thin isolator. Electricity current from juction can be explained by Sine-Gordon equation. From the equation, it will be obtained model of fluxon’s wave that is one of soliton. This research’s type is desriptive which use numerical approach by finite diffrence methode. It is designed a program that use Matlab R.2010 software to solve nonlinear equation and to get soliton’s solution. From the solution, fluxon and anti fluxon wave property on Long Josephson Junction can be analised. The solution show soliton characteristics, that a fluxon can move for long distance without any shape changed. If there is a fluxon or antifluxon collision, they will preserve ordinary shape. When a fluxon reach end of junction, fluxon will be transformed to antifluxon, and vice versa. If current density jc is small then voltage is small too. Keywords: Superconductors, Long Josephson Junction, fluxon

Studi awal rancang bangun colorimeter sebagai pendeteksi pada pewarna makanan menggunakan sensor photodioda (Early studies on the design of a colorimeter to detect food coloring using a photodiode sensor ) Delvi Ayu Wulandari; - Yulkifli
PILLAR OF PHYSICS Vol 11, No 2 (2018)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Laboratory have a function important in research. Laboratory of science must be have instrumentation who sophisticated. Chemistry not separated from research, one of the research of chemistry is colorimetric. Colorimetric is a method used in chemical analysis. The method of colorimetric is used intensity of solution. The instrumentation who measuring intensity of solution is colorimeter. This research is make colorimeter used sensor photodiode. Sensor photodiode is photo detector and very sensitivity to radiance. The sample of research is food dye. The food dye in this research is green. The chosen of food dye causes the sensor just can detection color of green. The result showed the measurement of average output voltage is 1,378 V. The output sensor not stable cause the sensor have high sensitivity. Desain of instrument colorimetric is a black box. The Selection of black box cause the measurement result are not affected by external light. The research light source is monochromatic.

Rock structure estimation using smoothness-constraint least-squares inversion data geolistric resistivity of schlumberger configuration in Bukit Lantiak Padang Selatan Rahmi Kurnia Putri
PILLAR OF PHYSICS Vol 4 (2014)
Publisher : Department of Physics – Universitas Negeri Padang UNP

A research about rocks structure has been done in Bukit Lantiak Padang Selatan. The aim of this research are determine kinds of rocks, rocks structure and model 3D spread of rocks in landslide area, Bukit Lantiak. This research use a Resistivity Geoelectrical method with Schlumberger Configuration. Data were collected by ARES Multielectrode in 4 lines. The data were interpreted by Least-Squares inversion to obtain a 2D model and 3D model of earth’s surface that consists of depth and resistivity value. The result of this research showed that the kinds of rocks in this area consist of Andesite, Clay, Sandstone and Limestone. Generally rock structure in this area consists of Sandstone at depth 6 m from surface , next layer consists of Limestone at depth more than 5,3 m, Clay was found at depth 34, 4 m until 43,4 m and the last layer was found Andesite. Model 3D showed that Sandstone and Clay found in all area, Limestone found in Southwestern, Andesite found in northeaster of research location

Rancang bangun detektor ketinggian air di landasan pacu pesawat terbang berbasis internet of things (Water level detector fabrication design on an airplane runway based on the internet of things) Puti Aulia Mardiah; - Yohandri
PILLAR OF PHYSICS Vol 12, No 2 (2019)
Publisher : Department of Physics – Universitas Negeri Padang UNP

The runway of an aircraft is designed to keep it dry even if it rains to avoid hydroplaning. Hydroplaning is a plane slip on the runway due to standing water. In accordance with regulations from the Airport Directorate, DGCA NO. KP 212 in 2017, the operational requirement for runways to be able to serve landings and aircraft flights is when there is a maximum of 3 mm of standing water on the runway surface. The design of the water level detector on the runway uses the Arduino Mega 2560 as a microcontroller which processes and sends the detected data to the thingspeak via the internet network. Performance specifications for water level detectors are water level sensor designs, U detector pipes, runways, electronic circuits. The water level sensor is a touch sensor that is designed and printed on a PCB board with horizontal and vertical strip designs. However, the level of accuracy and accuracy of the vertical sensor strip design is higher than the horizontal sensor strip design. Detected data will be processed in Arduino Mega 2560 and typed into the thingspeak page using the internet network. Data output can be accessed via a PC or smartphone connected to the internet network. The results of comparison with standard tools found the average percentage of errors for the horizontal sensor strip design was 97.08% while for the vertical sensor strip design was 4.98%. From the comparison results, the average percentage of accuracy for the horizontal sensor strip design is 8.57% and for the vertical sensor strip design is 95.01% with precision of 42.32% and 84.77%.Keywords : Arduino Mega 2560, Internet Of Things, thingspeak, sensor strip design

Investigasi aquifer dengan metode inversi smoothness-constraint least squares data geolistrik tahanan jenis konfigurasi schlumberger di Bukit Apit Puhun Kecamatan Guguk Panjang Kota Bukittinggi (Aquifer investigation using smoothness-constraint least squares inversion method of geoelectric resistivity schlumberger configuration in Bukit Apit Puhun, Guguk Panjang District, Bukittinggi City) Imran Razat; - Akmam; - Mahrizal
PILLAR OF PHYSICS Vol 6 (2015)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Bukit Apit Puhun was one of the area that need to know information about the depth of the aquifer layer. Bukit Apit Puhun located at Sianok canyon a valley surrounded by hills composed by a layer of igneous rocks. Layers of rock in the Sianok canyon assumed can store groundwater reserves. This research used the resistivity geoelectrical methode with Schlumberger configuration. The data were processed and interpreted by the Smoothness Constraint Least-Squares inversion. The data were taken five track using ARES (Automatic Resistivitymeter). The result of this research showed that the material contained in the Bukit Apit Puhun was Clay, Sandstone, Limestone and Andesite. The material contained in the study area shows that the area was a water catchment area with no finding of aquifer layers in every track. Results of this study were not strengthened by the discovery of a well to track the location of measurement

Pembuatan sistem pengukuran jarak benda digital berbasis sensor Fluxgate (Development of a digital object distance measurement system based on the Fluxgate sensor) Rezy Prima; - Asrizal; - Yulkifli
PILLAR OF PHYSICS Vol 1 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

ABSTRACTMeasurement of the magnetic field is important because many objects have magnet and useful in life. To measure the magnetic field of an object is required a sensor. One type of sensor to detect the magnetic field is fluxgate sensor. Fluxgate magnetic sensor is a sensor that works by changing the magnetic flux around the sensor element. By utilizing the working principle of the fluxgate sensor can be madethe object distance measuring system base on digital fluxgate sensor. The purpose of this research is to determine: static characteristics of sensor fluxgate Z61, performance specifications and design specifications of the digital object distance measuring system based fluxgate sensor. Measurements of magnetic that influenced of distance from the sensor output voltage has been done. The data obtained through measurements was analyzed in two methods, those are statistics and graphs. Base on data and analysis conducted to know the sensitivity and accuracy of the fluxgate sensor Z61. Based on the data and alysisis can be presented three results. First Z61 fluxgate sensor static characteristics include transfer function of V0=0.622x 0.0245x2+3977, sensitivity S=0.049x-0622 and accuracy 0999. The second device length is approximately 30 cm with 20 cm wide with acapacity measurement of 7 millimeters to 15 millimeters by using a magnet as the source of the magnetic field, Z61 type fluxgate sensors, a micrometer screw and microcontroller ATMEGA 8535. Third design specifications of the digital object distance measuring system based fluxgate sensor consists of a percentage error of 12%, precision 0.875 and accuracy 0.831. Keywords: measurements system, magnetic field, fluxgate sensor

PEMBUATAN DAN PENENTUAN SPESIFIKASI SENSOR GAYA BERAT BERBASIS PEGAS DAN LDR Muhammad Fuad
PILLAR OF PHYSICS Vol 2 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Objective of this reseach are to investigate the performance spesification and the design spesification of gravity force sensor base on spring and LDR. Data is collected by direct measurement and indirect measurement. Direct measurement is done to measure mass of object and output voltage of sensor. Indirect measurement is done to determine the accuracy and the precision of gravity force sensor. Data is analized by error theory and graph method. There are two mains result of this record. First, performance spesification consist of drawing-spring, LDR, signal conditioning circuit that convert weight of object into resistance and then into output voltage. Second, transfer function sensitivity of gravity force sensor is directly proportional with initial voltage is 1,516 Volt and sensitivity is 6,013 Volt/Newton. Accuracy and presicion of gravity force sensor are high, respectly 98,59 % and 0,999 Keyword: Gravity Sensor, LDR, Spring, Spesification Performance, Spesification Design

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

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Home Page

OAI Link

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Contact Name Syafriani

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Phone +6281267996692

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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