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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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Modeling the characteristics of internal soliter wave in sea water using the korteweg de vries equation soliton solution Yogi Febriano
PILLAR OF PHYSICS Vol 4 (2014)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Internal soliton wave is the wave that happen below of sea surface. This wave occur is caused by distinction of mass density of seawater layer. The characteristic of this wave is defend it form and velocity. The aim of this research are to study model and analyzed the effect of amplitude, mass density, and thickness of layer towards internal soliton waves velocity. This research analyze equation of Korteweg de Vries of internal soliton wave to get the soliton solution from the result of this research was designed a program using Matlab 7.0. The result of program are an output of velocity and modelling chart in three dimensional. This result shows the effect of amplitude, mass density, and layer thickness towards velocity and widening of wave pulse

Pengaruh suhu sintering terhadap sifat penyerap gelombang mikro dari nanokomposit CoFe2O4/PVDF yang di preparasi dengan metode sol-gel (Sintering temperature effect on the microwave-absorbing properties of the CoFe2O4 / PVDF nanocomposites prepared by the sol-gel method) Yona Sri Mantia; - Ramli; Yenni Darvina; - Desnita
PILLAR OF PHYSICS Vol 12, No 2 (2019)
Publisher : Department of Physics – Universitas Negeri Padang UNP

This number applications of microwaves are numerous so that it produces microwaves that emit. If it is not in control, there will be interference with electromagnetic signals. This also causes disruption of the working system of the Neighborhood. CoFe2O4/PVDF nanocomposite synthesized by the sol-gel method for microwave preparation was completed. Making materials to absorb microwaves uses five variations of sintering temperature, namely 250℃, 280℃, 350℃, 400℃, and 450℃. The sintering process is carried out using a furnace. The presence of a single phase on CoFe2O4/PVDF nanocomposite was characterized using X-Ray Difraction (XRD), to see the functional groups using Fourier Transform Infrared (FTIR), and to help wave use carried out using Vector Network Analyzer (VNA). This study discusses the sintering of microwave absorbers.The characterization results using VNA get a maximum Reflection Loss value of -29,7051 dB at a temperature of 400℃, frequency of 11.76 GHz, with absoption coefficient 96%. Different sintering temperatures produce a large amount of different absorptions. Nanocomposite which has a large value of reflection loss does not necessarily have a large answering tape width. The quality of materials that are good for microwave absorbers must also consider the value of the width of the capture band.The best absorption occurs at a temperature of 450 ℃ because have a maximum reflection loss value -21.116 dB, frequency of 6.00 GHz, absorption band widht 0.54 GHz, and absoption coefficient 91%.

Cover, Editorial Team and Table of Content Pendahuluan Jurnal
PILLAR OF PHYSICS Vol 9 (2017)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Cover, Dewan Redaksi, Daftar Isi

Penentuan jenis mineral magnetik Guano dari Gua Solek dan Gua Rantai Kecamatan Lareh Sago Halaban Kabupaten Lima Puluh Kota menggunakan metode X-Ray Diffraction (Determination of the magnetic mineral type of Guano from Solek Cave and Chain Caves, Lareh Sago Halaban District, Lima Puluh Kota, using the X-Ray Diffraction method) Dessupri Niarti; Hamdi Rifai; Fatni Mufit
PILLAR OF PHYSICS Vol 1 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

ABSTRACTFrom the result measurement of guano susceptibility magnetic, was found in Solek and Rantai cave indicate magnetic mineral. But the kinds of magnetic mineral it’s don’t know. The kinds of magnetic mineral consist of iron oxide and sulfide oxide. In this research will be determinate the kinds of magnetic mineral which from iron oxide use x-ray diffraction method. The guano which determinated from the kinds of magnetic mineral before extraction use strong magnet. Extraction process have function for desepared magnetic mineral and nonmagnetic mineral. The result from the extraction like smooth magnetic mineral and then will be measure use x-ray diffractometer. Based on the measure process with x-ray diffraction, know the kinds of magnetic mineral which indicate in guano of Solek and Rantai Cave at Lareh Sago Halaban District Lima Puluh Kota Regency, West Sumatera the most kind of mineral was magnetite 34). Then we also found another magnetic minerals such as hematite 23).Keywords: Guano, mineral magnetic properties, x-ray diffraction (XRD), iron oxide, sulfide oxide

Perbandingan Karakteristik Fisis Kopi Luwak (Civet coffee) dan Kopi Biasa Jenis Arabika Megah Aysah Fuferti.Z
PILLAR OF PHYSICS Vol 2 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Coffee is one of the most popular beverages in the world is consumed by many people. The purpose of this study was to determine how the physical comparisons civet coffee and regular coffee arabika type. Research carried out by varying the mass density of coffee and container volume, the results obtained from the density value of civet coffee is bigger than the usual coffee, civet coffee density value on the container volume 319.32 is 0.02264 whereas regular coffee is 0.01927, the container volume 509.43 density of civet coffee is 0.02265 whereas regular coffee is 0.01989, the container volume 739.41 density of civet coffee is 0.02292 whereas regular coffee is 0.01999. The results of the specific heat shows that the specific heat value of civet coffee is bigger than the usual coffee, civet coffee specific heat value of 14.28 Kal / ° C, while the value of specific heat of regular coffee 10,08 Kal / ° C. Thermal conductivity value of civet coffee is less than the value of regular coffee conductivity, thermal conductivity value of civet coffee is 0.41x10-4 Kal / cm s ° C while the thermal conductivity value of regular coffee 2.74x10-4 Kal / cm s ° C. Water content of the research results obtained civet coffee is 2.5%, while 3.5% of regular coffee so known that the water content of civet coffee is less than the value of the water content of regular coffee arabica types. Keywords: common Type Arabika Coffee, Civet coffee, Density, Thermal Conductivity, Heat type and water content

Analisis nilai percepatan tanah maksimum di wilayah Sumatera Barat menggunakan persamaan empiris Mc Guire, Si and Midorikawa dan Donovan (The analysis of the value of the maximum ground acceleration in the West Sumatra region uses the empirical equation of Mc Guire, Si and Midorikawa and Donovan) Romadiana Dwi; - Syafriani; Andiyansyah Sabarani
PILLAR OF PHYSICS Vol 11, No 1 (2018)
Publisher : Department of Physics – Universitas Negeri Padang UNP

We counducted peak ground acceleration analysis caused by the earthquakes that occurred on West Sumatera on February 2008 until September 2016. We compared the acceleration calculation between some empirical attenuation equation i.e. McGuirre (1963), Si and Midorikawa (1999) and Donovan (1973) with the observed data using ETNA Accelerograph at BMKG Padang Panjang Geophysical Station. We clustered the magnitude with M 1.5 to 3.0 SR, 3.1 to 5.0 SR, 5.1 to 7.0 SR and M 7.1 to 8.1 SR to gain the result of PGA differences between empirical equation with the observed data. The first cluster with M 1.5 to 3.0 SR found that the value of PGA Si and Midorikawa approach PGA Accelerograph value at a distance of hiposenter <30 km. The second cluster with M 3.1 to 5.0 SR found that the PGA values obtained using empirical formulas approximate the PGA values recorded by the Accelerograph tool. There was a significant change in the PGA Accelerograph value with a distance of ± 20 km hyposenter. Because there is damage to the Accelerograph tool when recording the earthquake. M 5.1 to 7.0 SR cluster explained that the value of PGA obtained from the calculation approach PGA Accelerograph value at a distance of hiposenter> 350 km. The value of PGA Si and Midorikawa in cluster with M 7.1 to 8.1 SR approaches PGA Accelerograph value at hyposenter distance <600 km.

Pengaruh variasi temperatur kalsinasi terhadap karakteristik kalsium karbonat (CaCO3) dalam cangkang keong sawah (Pila ampullacea) yang terdapat di Kabupaten Pasaman (The effect of calcination temperature variations on the characteristics of calcium carbonate (CaCO3) in the shells of rice field snails (Pila ampullacea) found in Pasaman Regency) Haryona Delvita; Djusmaini Djamas; - Ramli
PILLAR OF PHYSICS Vol 6 (2015)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Snail paddy shells (Pila ampullacea) located in sub-discricts Simpang Alahan Mati Pasaman contain lots of calcium carbonate (CaCO3) that is widely utilized in the industry. On the research of test data was obtained in the form of deposits of calcium levels XRF shell snail paddy is 93,438%. Based on test data XRD is obtained that information due to the temperature of the calcination transformation phase aragonite to calcite phase. The rising temperature of calcination causes a change of the structure of CaCO3 from Hexagonal structure to Ortorhombik structure. The rising temperature of calcination, grain size CaCO3 anyone rise to a certain temperature and then decline, as the grain size increases from aragonite before dikalsinasi 83,872 nm became 106,302 nm dikalsinasi on temperature after 380 ̊C. While the phase of calcite have grain size on temperature 380 ̊C, 410 ̊C, 440 ̊C, 470 ̊C and 500 ̊C each 118,983 nm, 139,882 nm, 137,067 nm, 140,047 nm, and 63,533 nm

Rancang bangun alat ukur jumlah tetes dan volume sisa cairan infus dengan warning system pada sistem monitoring cairan infus berbasis arduino (Measuring device for the number of drops fabrication design and the volume of remaining infusion fluids with a warning system in the Arduino-based infusion fluid monitoring system) Auliya Sifa Fauziyyah; - Yohandri
PILLAR OF PHYSICS Vol 12, No 2 (2019)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Intravenous Fluids Drops are very important for the process of healing or treatment for patients. The function of infusion is to replace the loss of fluids or nutrients in the body. In Indonesia, monitoring system of condition about infusion is still done manually, but for the cases such a large hospitals which is the number of patients is not balanced by medical personnel, it is becomes ineffective so that it can cause mistakes in monitoring. A very serious mistake can occur are too late in replacing the infusion. The solution to solve this problem is to make an automatic infusion monitoring system with an alarm warning. This research is eksperimental research. The measurement technique taken is direct and indirect measurement. Direct measurement data is mass of infusion and indirect measurment data is the number of infusion drops and the percentage of infusion volume. The purpose of this research is to determine the design spesifications and peformance spesification of the instrument. The sensor used to measure infusion drops per minute is photogate and to measure the infusion volume is load cell. Motor Servo Tower Pro SG90 are used as automatic drip control and arduino mega used as a brain for this instrument. The display is use TFT LCD and using buzzer for alarm warning. The accuracy of infusion drops per minute system is 0,97 with error 1,25% and accuracy of infusion volume is 0,978 with error 1,944%.

Penerapan metode geolistrik tahanan jenis konfigurasi wenner untuk menentukan penyebaran lindi di Tempat Pemprosesan Akhir (TPA) sampah Air Dingin Kota Padang (The application of the wenner configuration resistivity geoelectric method to determine the distribution of leachate in the final waste processing in Air Dingin Padang City) Yori Deswita; Nofi Yendri Sudiar; Fatni Mufit; - Akmam
PILLAR OF PHYSICS Vol 5 (2015)
Publisher : Department of Physics – Universitas Negeri Padang UNP

TPA Air Dingin are landfills located in Padang and positioned near the inhabitant area. The accumulationof waste at TPA Air Dingin can cause environment pollution. The aimed of this research is to determine the resistivity and the spread of leachate in TPA Air Dingin. Estimation of the distribution of leachate below the ground surface use a Resistivity Geoelectrical method with Wenner Configuration. Data were collected by ARES Multielectrode in 3 lines. The data were interpreted using Robust inversion to obtain a 2D 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 Groundwater, Clay, Sandstone and Andesite. Direction of spread of leachate on the measurements, the distribution of leachate moving from the southeast towards the Northwest

Estimated of metal mineral distribution using Induced Polarization (IP) Geolistric in Malalak West Sumatra Indonesia Ahmad Kasasi; - Akmam
PILLAR OF PHYSICS Vol 13, No 2 (2020)
Publisher : Department of Physics – Universitas Negeri Padang UNP

The Malalak area in West Sumatra Indonesia area located around the volcano and generally rich in economically valuable metal minerals, however, the presence of minerals in nature is not easy to find. The existence of economically valuable minerals around volcanoes, such as Mount Singgalang has not been widely revealed. Based on the above, a study aimed to estimate the distribution of metal minerals in Malalak Subdistrict, Agam Regency when viewed by the Geoelectric Induced Polarization (IP) method was conducted. Research is needed as reference data to predict mineral potential in the study area so that it can be used by the Malalak community. The exploration method used in this research is the Geoelectric Induced Polarization (IP) method. Data obtained by measuring using the ARES measuring instrument. Data processing uses Res2Dinv software to obtain 2D cross-sections and the data is interpreted using Smoothness-Constraint Least-Square inversion. Based on the estimates made to determine the distribution of minerals in the Malalak District, the types of minerals are Bornite in Line 1 with Chargeability of 6.93 msec and mineral Galena in Line 2 with Chargeability of 4.30 msec. The rock types found in Malalak District, consist of Sandstone, Limestone, and Granite. Track 1 has a type of rock with a resistivity value, namely Sandstone with a value of 58.4 Ωm - 295 Ωm, Limestone with a value of 296 Ωm - 1,501 Ωm and Granite with a value of 1,502 Ωm - 38,768.04 Ωm. Track 2 has a rock type with a resistivity value, namely Sandstone with a value of 58.5 Ωm - 287 Ωm, Limestone with a value of 288 Ωm - 1,412 Ωm and Granite with a value of 1,413 Ωm - 34,179.12 Ωm.

Page 18 of 30 | Total Record : 297

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Home Page

OAI Link

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Contact Name Syafriani

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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

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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