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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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Identifikasi prekursor tanah longsor berdasarkan perubahan nilai tahanan jenis batuan menggunakan metode geolistrik time-lapse konfigurasi dipole-dipole di Bukik Lantiak Kecamatan Padang Selatan (Identification of landslide precursors based on changes in the value of rock resistivity using the geoelectric time-lapse method of dipole-dipole configuration in Bukik Lantiak, Padang Selatan District ) Rifa Kurnia; - Akmam; - Mahrizal
PILLAR OF PHYSICS Vol 11, No 1 (2018)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Landslides are a serious hazard for mankind causing fatality and material loss. Losses generated from landslide events can be minimized by investigating early symptoms or precursors of a landslide event. The research is conducted in Bukik Lantiak, South Padang sub-district by using Geolistrik method of time-lapse Dipole-dipole configuration as effort of early symptoms detection or precursor that can cause the occurrence of landslide disaster. The results shows that there is a change of rock resistivity value in each measurement path. The percentage change of resistivity are -12.25% of path 1, -8.73% of path 2, 3.07% of path 3, and -37.42% of path 4. The landslide precursor can be known from change of resistivity value, when measurements are made on each path at two different times so that the measured resistivity will be different. This difference is caused by the absorption of rainwater by the surface which then migrates into the inner layer

Penyelidikan jenis mineral di Jorong Koto Baru Nagari Aie Dingin Kabupaten Solok dengan metode geolistrik Induced Polarization (IP) (Investigating the types of minerals in Jorong Koto Baru Nagari Aie Dingin Solok Regency using the geoelectric Induced Polarization (IP) method) Hisni Rahmi; - Asrul; - Akmam
PILLAR OF PHYSICS Vol 6 (2015)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Jorong Koto Baru Nagari Aie Dingin Kabupaten Solok is predict has mineral resources. The research to find deposit of several minerals have not be done. The purpose of the investigation is to identify any minerals contained in the Jorong Koto Baru based on chargeability value by Induced Polarization (IP) Geoelectrical method and distribution of minerals there. This research instrument is ARES (Automatic Resistivitymeter) to get data of apparent chargeability on the site. Data is collected and then be interpretated by Smoothness-Constraint Least Squares inversion. Data interpretation shows the actual value of chargeability and then be compared table of chargeability minerals and rocks. The result show that there are Graphite, Chalcophyrite, Copper, and Galena. Mineral Graphite (carbon compounds) are found with a thickness of 12.75 m, 43.4 m and 56.15 m. Mineral Chalchophyrite (dominated by copper element) was found with a thickness of 43.78 m and 6.15 m. Mineral Copper (copper element) was found with a thickness of 10.5 m, 15.42 m, 6.52 m and 40.1 m, while mineral Galena (lead sulfide) was found with a thickness of 2.78 m, 9.73 m, and 4.35 m. Conclusion the area has some potential mineral resources.

Analisis karakteristik periode ulang curah hujan dengan metode Iwai Kadoya di daerah lokal sumatera barat dan regional sumatera (Analysis of the characteristics of the return period of rainfall using the Iwai Kadoya method in the local area of West Sumatra and regional Sumatra) Mia Nova Isnia Gara; Letmi Dwiridal; Sugeng Nugroho
PILLAR OF PHYSICS Vol 12, No 2 (2019)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Sumatera is located in the western part of Indonesia, this result in the Sumatera region has high rainfall, due to the west monsun origaniting from the Indian Ocean a lot through the western part of Indonesia. Sumatera Island are divided into three major parts that have different regional topographies and type pf rainfall, so that characteristics of rainfall in Sumatera are different in each region. High rainfall results in natural disaster, to reduce the impact of disaster mitigation, the rainfall return periodis also used to predict the time needed to resume maximum rainfall. In this study, calculate the rainfall return period from 8 stations. From the calculation results it is known that the re-period of highest rainfall is at the Meteorogical Station of Minang Kabau Airport in the period 1999-2018 with a return period of 30 days- 300 years with the rainfall frequency pf 186-524 mm/day, with equatorial rain type.

Optimalisasi temperatur kalsinasi untuk mendapatkan kalsit-CaCO3 dalam cangkang pensi (Corbicula moltkiana) yang terdapat di Danau Maninjau (Optimization of calcination temperature to obtain calcite-CaCO3 in pensi shells (Corbicula moltkiana) found in Lake Maninjau) Suci Wahyuni; Yenni Darvina; - Ramli
PILLAR OF PHYSICS Vol 6 (2015)
Publisher : Department of Physics – Universitas Negeri Padang UNP

The utilization of pensi (Corbicula moltkiana) shell waste in Maninjau lake is not optimal so that we need an effort to make it has economic value. One of them is using calcium carbonate in pensi shell. Calcite is one of calcium carbonate polymorphs are often used in industrial paint, paper, ink, and other chemical industries. This experiment aims to determine optimum of calcination temperature to obtain calcite in pensi shell can be exploited and has economic value. The method that used is by giving calcination temperature of 300˚C, 320˚C, 340˚C, 360˚C, 380˚C, dan 400˚C to pensi shell and then characterized using XRF and XRD. Result of characterization using XRF show that pensi shell containe calcium element is 93,207% dan about 6% of other elements such as Si, Al, Ag, Mg, P, dan Fe. The result of characterizaion using XRD that compared with the ICDD database show that calcite phase has Rombhohedral structure with unit cell a = 4,9590Å, b = 7.9680Å, and c = 5.4710Å. Based of analysis can be concluded that the increase in temperature causes increasing intensity of calcite and dominant temperature to obtaine calcite phase at 400˚C

Estimasi kedalaman batuan dasar berdasarkan nilai tahanan jenis menggunakan metoda geolostrik konfigurasi Schlumberger di Universitas Negeri Padang di kampus Air Tawar (The estimation of the bedrock depth based on the resistivity value using the geolostric method of the Schlumberger configuration at Universitas Negeri Padang Air Tawar) Nelvira Rizalmi; - Akmam; - Mahrizal
PILLAR OF PHYSICS Vol 1 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

The purpose of this study were determine the value of resistivity and the depth of basement rocks at Universitas Negeri Padang Air Tawar Campus, know the type of basement rocks at Universitas Negeri Padang Air Tawar Campus. The research was conducted using geoelectric method Schlumberger configuration. Measurements were taken at four-track measurements. 2D inversion results using the standard software v3.57 Res2Dinv constraint least squares inversion is suspected basement rocks on Line 2nd and Line 3rd. Line 2nd with the main sounding point located at coordinates 00053'53,1"LS and 100021'02,8" BT resistivity values between 0.485-314.3 Ωm, there are basment rocks at a depth of > 23.85 m with a resistivity value of 21.9 -97.7 Ωm. Line 3rd with the main sounding point located at coordinates 00053'48,9"LS and 100020'506"BT resistivity values between 0965-895 Ωm, there are basment rocks at a depth of 43.4 m with a resistivity value of 88.6-179.8 Ωm. Basement rocks found suspected type Andesite.

PENENTUAN UKURAN BULIR DAN JENIS DOMAIN MAGNETIK GUANO DARI GUA RANTAI DAN GUA SOLEK DI KECAMATAN LAREH SAGO HALABAN KABUPATEN 50 KOTA DENGAN METODE ANHYSTERETIC REMANENT MAGNETIZATION (ARM) Nilam Sari
PILLAR OF PHYSICS Vol 2 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Magnetic properties of Guano can be seen from the concentration of magnetic minerals, grain size, domain type and type of magnetic minerals. From the magnetic susceptibility measurements was found that there is concentration of magnetic minerals in the guano. This research will be studied about grain size and type of magnetic domains from Rantai and Solek Cave, Lareh Sago Halaban Subdistrict, 50 Kota District. Grain size and type of magnetic domains can be identified by matching the decay curve of Anhysteretic remanent Magnetization (ARM) of sample with Lowrie-Fuller Test standard curve and King's Plot. The instrument used in this research are Molspin AF Demagnetizer and Minispin Magnetometer. The determination results of grain size and type of magnetic domain Rantai Cave have variation with the range between <0.1 μm - >135 μm with type of domain magnetic is single domain (SD), pseudo single domain (PSD) and multi domain (MD). Guano samples of Solek Cave having grain sizes of magnetic between 2 μm-135 μm where magnetic domains are pseudo single domain (PSD) and multi domain (MD). Keywords: Guano, grain size, magnetic domain, Anhysteretic Remanent Magnetization (ARM).

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.

Pengaruh temperatur kalsinasi terhadap struktur mineral granit yang terdapat di Nagari Surian Kecamatan Pantai Cermin Kabupaten Solok (The effect of calcination temperature on the granite mineral structure in Nagari Surian, Pantai Cermin District, Solok Regency) - Juliansyah; - Ratnawulan; Ahmad Fauzi
PILLAR OF PHYSICS Vol 6 (2015)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Granite is an igneous rock in which the crystals have rough with the mineral composition of quartz, feldspar, plagioclase sodium and other minerals. It has done research on the granite from Surian by giving he at treatment for investigating the crystal structure of granite. The samples of granite were crushed and sieved till from powder and calcined at temperature 500 ℃ to 1000 ℃ for 1 hour. The results calcination were characterized by X-Ray Diffraction (XRD). The results calcination showed that the granite occurred alteration of structure on phase, such as from anorthic system with unit cell a = 8,256 Å, b = 12 842 Å and c = 14.088 Å to monoclinic structure with a = 8.1372 Å, b = 12.78 Å and c = 14.009 Å

Pembuatan alat ukur sudut datang dan intensitas cahaya matahari real time menggunakan sensor accelerometer dan LDR (Measuring instrument fabrication of incidence angle and real-time sunlight intensity using accelerometer and LDR sensors measuring instrument) Ocha Samantha Feriyana; Zulhendri Kamus
PILLAR OF PHYSICS Vol 12, No 1 (2019)
Publisher : Department of Physics – Universitas Negeri Padang UNP

This research aims to determine the accuracy and accuracy of the measuring instrument of the angle of arrival and the intensity of sunlight in real time using an accelerometer sensor and LDR. . To achieve this goal, R & D research was conducted which consisted of: reviewing existing tools, conducting literature studies, planning tool development, internal testing of tool design, revision of tool design, limited testing of measuring instruments, revision of measuring instruments and field trials main. Data were analyzed using calculations to find out the accuracy of measurements. The results of data analysis explain two important things from making a measuring instrument system. First, the angle of view measuring instrument and the intensity of sunlight consist of an accelerometer sensor and LDR. Measurement data is displayed on the LCD. Second, the accuracy and accuracy of the measuring instrument. In the measurement results, the azimuth values obtained from the measuring instrument are compared with the data obtained from BMKG. From the results of these comparisons, the average percentage of accuracy and error in measuring instruments is 95.5% and 4.52%. In the sun light intensity, the results of data analysis showed that the accuracy and error measurement of light intensity were 92.83% and 7.17% respectively.

Pengaruh ukuran bulir zeolit terhadap kadar bioetanol dari tanaman tebu (Saccharum Officinarum) (Effect of zeolite grain size on bioethanol levels from sugarcane (Saccharum Officinarum)) Ornella Frita; - Ratnawulan; - Gusnedi
PILLAR OF PHYSICS Vol 5 (2015)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Zeolite is an adsorbent is used to improve the purity of bioethanol from sugar cane. Bioethanol produced by the sugar cane using of the fermentation procces and distillation procces obtained the highest levels of only 90%, and with repeated distillation the content of bioethanol does not increase. It necessary for an alternative method immersion of zeolite into bioethanol for 24 hours. Zeolite with varying size of 50 mesh, 80 mesh, 100 mesh, 200 mesh was into the bioethanol content of 90% and produced bioethanol content of 91,3%, 92%, 93,3% and 94%. Bioethanol content 94% is also done the same thing and produced of 95%, 95%, 95,5%, 95,5%. In general, an increase in the levels of bioethanol in the size grains of zeolit used.

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Home Page

OAI Link

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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