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INDONESIA
Pillar of Physics: Jurnal Berkala Ilmiah Fisika
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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Pengaruh jenis kulit pisang dan variasi waktu fermentasi terhadap kelistrikan dari sel accu dengan menggunakan larutan kulit pisang (Effect of banana peel type and fermentation time variation on the electricity of battery cells using a banana peel solution) Yasni Novi Hendri; - Gusnedi; - Ratnawulan
PILLAR OF PHYSICS Vol 6 (2015)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (422.025 KB) | DOI: 10.24036/1943171074

Abstract

One attempt to deal with the energy crisis is the search of alternative energy. Of organic materials as well as inorganic material potentially to serve as alternative energy. Among them, waste banana peels that can be used as a biobaterai. One way to make banana peels as the optimal biobaterai with he does study of electricity generated from biobaterai by making a banana peels  as a solution of elektrolitnya using a container of accu. The purpose of this study was to investigate the influence of different types of banana peels and fermentation time variation against electricity from cells using aqueous acid to the skin of a banana. This research was conducted on variation of skin types of bananas (ambon, raja, kepok and mas) and variations of the fermentation time (48, 96, 144 and 189 hours). In this study obtained data current and voltage measurement results of accu by using a solution of banana peels. Based on data obtained optimal banana peels  type to serve as biobaterai is ambon banana with the value of the voltage and the current volt 33.08 mA. The fermentation time for 192 hours  has obtained  value of current and voltage for aqueous banana peels ambon, kepok, King and mas in a row was 33.08 mA and 3.70 volt, 25 mA and 3.23 volt, 24.65 mA and 2.88 volt, and 24.26 mA and 3.02 volt. The length of time the fermentation lowers the pH value of the material. This is because the process of the activity of microorganisms in the materials that increased, so that the electron transfer process took place rapidly resulting in the voltage and current values are getting lar
Estimasi kedalaman batuan dasar menggunakan metoda geolistrik tahanan jenis konfigurasi dipole-dipole di Universitas Negeri Padang Kampus Air Tawar (The estimation of bedrock depth using the geoelectric resistivity method of dipole-dipole configuration at the Universitas Negeri Padang Air Tawar) Media Febrina; - Akmam; Fatni Mufit
PILLAR OF PHYSICS Vol 1 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (815.085 KB) | DOI: 10.24036/398171074

Abstract

Estimation of basement rocks depth has been done in Padang State University, Air Tawar campus. The research that uses Dipole-dipole resistivity geoelectrical method was aimed to determine the depth, resistivity value and the kinds of basement rocks. Data were collected by Ares Multielectrode in 4 lines. Processing of data was done using Res2dinv software with Robust Constraint inversion and it results 2D model of earth’s surface that consists of depth and resistivity value. The result of this research shows that there are basement rocks around sounding point 00053’44,0”S and 100020’79,8”E in 1st line and sounding point 00053’53,1”S and 100021’02,8”E in 2nd line at depth of more than 25,2 m with resistivity value 513 – 622 Ωm and 632 – 2150 Ωm. Basement rocks are also found in 3rd line around sounding point 00053’48,9”S dan 100020’50,6”E at depth of more than 21,85 m with resistivity value 596,5 – 734 Ωm, while 4th line at sounding point 00053’55,7”S and 100021’02,3”E did not find basement rocks. Possibility of basement rocks in 4th line are at depth of more than 29,5 m. Basement rocks that are found in this research is interpreted as Andesite. Information about basement rocks can be used for construction planning in Padang State University, Air Tawar campus. Keywords: basement rocks, resistivity geoelectrical method, Dipole-dipole, Padang State University
PENGUKURAN MEDAN MAGNETIK BATUAN MENGGUNAKAN SENSOR FLUXGATE Airin Ahad Dini
PILLAR OF PHYSICS Vol 2 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (193.528 KB) | DOI: 10.24036/751171074

Abstract

Magnetic minerals serve as the main support technology. To know the content of a substance requires magnetic sensors. One type of sensor for detecting a magnetic field is fluxgate sensor, which works based on changes in magnetic flux surrounding the sensor element. This research plan of measuring tools based rock magnetic field fluxgate sensor. The purpose of this study was explained performansi specification of measurment instruments, determining the accuracy and precision of measurements, measuring tools fluxgate magnetic field sensor based. This research is a research laboratory experiment. Measurement techniques and data collection is performed directly and indirectly. Direct measurements carried out on the magnetic field strength of different rocks and see the effects on the output voltage produced by the magnetic field measuring devices. While the collection and measurement is kelinieran indirectly to the magnetic field and the bias magnetic field strength measuring devices. Data obtained through measurement is analyzed in two ways, namely in statistics and graphics. Based on the analysis performed can be explained several important results. First,measurement instrument of magnetic field based on fluxgate sensor consists of three elements namely the fluxgate sensor and the signal processing chain. Second, the closer the distance measurement on the sensor samples the value shown will improve. Third, the design specifications of the magnetic field measuring devices based fluxgate sensor is in the form of precision and accuracy of a measuring instrument. Having obtained the accuracy of measurement of the magnetic field and the precision 0.986,0.972. Measurment instrument has a precision and accuracy are high enough on the magnetic field. Keyword : Fluxgate sensor, magnetic field, sensitivity, accuracy, precision.
Atmospheric stability analysis using Convective Available Potential Energy (CAPE) on the rain occurrence in Padang Yudha Nugraha; Asrul Asrul; Sugeng Nugroho
PILLAR OF PHYSICS Vol 10 (2017)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (676.156 KB) | DOI: 10.24036/2547171074

Abstract

Precipitation is ones of many atmospheric phenomena which closed with human activity. There is so many factors in earth atmosphere that can cause precipitation from global into local scale. One of them is atmospheric stability that identified based on convective available potential energy (CAPE). Using of CAPE is to know the characteristics of atmospheric stability and its correlation with precipitation so we can estimate accuracy of CAPE for predicting daily rainfall. Study took location at several areas in Padang as a region which is located in  tropical latitude and divide it based on topographical characteristic such coastal, urban, and slope mountain area. To understand characteristic of atmospheric stability, is used scatterplot between CAPE with precipitation rainfall. Conclusion shows that for all studied area, CAPE value have variation from slight into moderate, with a little case heavy and extreme value. Correlation between CAPE and daily rainfall shows a negative correlation, which has r score less than -0.2. It can be assumed that relationship between CAPE and rainfall is not significantly closed. Hence, we can assume that atmospheric stability has a less relationship for making high intensity precipitation.
Pengaruh variasi penambahan serbuk grafit dalam pasir terhadap konduktivitas listrik beton K-350 (Effect of variations in the addition of graphite powder in sand to the electrical conductivity of K-350 concrete) Fitri Anika; Djusmaini Djamas; - Ramli
PILLAR OF PHYSICS Vol 6 (2015)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (678.704 KB) | DOI: 10.24036/1938171074

Abstract

Concrete conductive using graphite powder as a conductive material has not been optimized in their use of construction materials. Therefore, be used graphite powder as an ingredient added in the sand for the manufacture of concrete that is conductive. So with the addition of graphite powder in the sand is expected to produce electrical conductivity in the concrete. This is caused by the addition of carbon (C) contained in graphite powder is able to conduct electricity through the cement paste and aggregate, thus increasing the electrical conductivity of concrete. Has been testing an electric conductivity in volume of concrete K-350 with the addition of graphite powder variation of 0%, 5%, 10%, 15% and 20% using the test method Four-Point Probe. Results of testing the value of the electrical conductivity in the volume of concrete for each successive age the age of 7 days is 0.0229 (Ω.m)-1, 0.0286 (Ω.m)-1, 0.0306 (Ω.m)-1, 0.0358 (Ω.m)-1, 0.0374 (Ω.m)-1. At the age of 14 days in a row is 0.0132 (Ω.m)-1, 0.0177 (Ω.m)-1, 0.0207 (Ω.m)-1, 0.0250 (Ω.m)-1, 0.0291 (Ω.m)-1. At the age of 21 days in a row is 0.0099 (Ω.m)-1, 0.0135 (Ω.m)-1, 0.0155 (Ω.m)-1, 0.0164 (Ω.m)-1, 0.0204 (Ω.m)-1. At the age of 28 days in a row is 0.0074 (Ω.m)-1, 0.0101 (Ω.m)-1, 0.0111 (Ω.m)-1, 0.0121 (Ω.m)-1, 0.0152 (Ω.m)-1. From this study it can be concluded that the addition of graphite powder variations can increase the value of the electrical conductivity in the volume of concrete K-350, but declined against the concrete. This is caused by the influence of water content owned concrete
Pembuatan dan karakterisasi listrik keramik ZnFe2O4 dengan doping TiO2 untuk termistor NTC dengan teknik pressing (Fabrication and electrical characterization of ZnFe2O4 ceramics with TiO2 doping for NTC thermistors by pressing techniques) Anesa Filda Khairani; - Ratnawulan
PILLAR OF PHYSICS Vol 12, No 1 (2019)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (451.638 KB) | DOI: 10.24036/6315171074

Abstract

Pembuatan dan Karakterisasi Listrik Keramik ZnFe2O4 dengan Doping TiO2 untuk Termistor NTC dengan Teknik Pressingtelah dilakukan. Penelitian ini merupakan penelitian eksperimen dengan metode yang digunakan adalah reaksi zat padat (solid state reaction ). Serbuk Fe2O3 dan ZnO dilarutkan kemudian dicampurkan. Campuran kemudian diendapkan menggunakan amoniak 10%. Hasil endapan kemudian dikeringkan pada suhu 100oC selama ± 6 jam, kemudian dikalsinasi pada suhu 500oC selama 1 jam. Serbuk ZnFe2O4 dicampur dengan serbuk TiO2 kemudian digerus hingga homogen selama ± 1 jam. Campuran kemudian dipress dengan tekanan 50 ton/cm2 hingga membentuk pelet pada cetakan berdiameter 8 mm. Pelet tersebut disinter pada suhu 1100oC selama 2 jam di dalam tungku dengan atmosfer udara. Pelet hasil sintering dilapisi perak untuk pembuatan elektroda. Hasil pengukuran tahanan listrik, nilai konstanta termistor adalah  K, dari keramik berbasis ZnFe2O4 dengan doping TiO2 yang dibuat memenuhi kebutuhan pasar.
Pengaruh temperatur kalsinasi terhadap struktur tembaga oksida dari daerah Pinti Kayu Kecamatan Koto Parik Gadang Diateh Kabupaten Solok Selatan (The effect of calcination temperature on the copper oxide structure of the Pinti Kayu area, Koto Parik Gadang Diateh District, South Solok Regency) Robby Zeffry; - Ratnawulan; - Yohandri
PILLAR OF PHYSICS Vol 5 (2015)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (627.876 KB) | DOI: 10.24036/1830171074

Abstract

The purpose of this study was to determine the levels of copper oxide content and analyze the effect of calcination temperature on the physical properties of copper oxide from Pinti kayu areas, district Koto Parik Gadang Diateh regency of  Solok Selatan. This analysis is important to identify the quality of the copper ore. The characterization using X-ray  Fluorescence (XRF) and X-Ray Diffraction (XRD). Based on measurement result (CuO) the percetage of coper oide is about 89.65%. The results of XRD analysis shows due to the influence of calcination temperature at a temperature of 145°C copper oxide structure changes from monoclinic to hexagonal structure at a temperature of 300°C, then at a temperature of 850°C into a cubic structure and at a temperature of 1000°C copper oxide into monoclinic structure
The effect of composition MnFe2O4 / PANi nanocomposite on the microstructure that synthesized by spin coating method Lucya Sinurat; Yenni Darvina; - Ramli; - Ratnawulan
PILLAR OF PHYSICS Vol 13, No 2 (2020)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (852.631 KB) | DOI: 10.24036/9322171074

Abstract

Manganese ferrite has the structure of MnFe2O4 which in the process of making it uses manganese mineral powder. Based on the MnFe2O4 testing is one material that is suitable for use as a composite by mixing other binders in it. Polyaniline (PANi) is a polymer that can be used as a binding material which is an attractive conductive polymer because it has unique properties and good thermal stability. This research was conducted by making three variations of the composition of MnFe2O4 / PANi namely 40%: 60%, 50%: 50%, and 60%: 40% made using the spin coating method. This research was conducted to investigate the effect of composition on the microstructure of the MnFe2O4 / PANi nanocomposite layer using the spin coating method. The microstructure to be investigated is the functional group of grain size and thickness of the nanocomposite layer. The tools used in this study are Fourier Transform Infrared (FTIR) used to obtain the functional groups of nanocomposite layers, X-ray Diffraction (XRD) is used to get the size of crystals and microstructure of crystals, and the Scanning Electron Microscope (SEM). Characterization and Scanning Electron Microscope (SEM) are used to obtain grain size and thickness of the nanocomposite layer. The results of the FTIR characterization are the functional groups of MnFe2O4 / PANi which produce absorption bands at wavenumbers 3214.85 cm-1, 3353.86 cm-1, and 3214.03 cm-1, which are O-H groups. The absorption band at wavenumbers 717.00 cm-1, 763.94 cm-1, and 747.31 cm-1 is the C-H group showing PANi. Absorption peaks that are below 1000 cm-1 that is at wavenumbers 874.78 cm-1, 924.18 cm-1, and 895.96 cm-1 show indications of Manganese Ferrit. The results of the XRD characterization were crystal size and microstrain, each of which had a crystal size composition of 49.90478417 nm, 45.29656118 nm, and 44.52213202, and then for the value of the microstrain, each variation was 0.116667149, 0.15983276, and 0.183718732. Then from SEM characterization results obtained grain size values of 0.445 μm, 0.426 μm, 0.318 μm, while the thickness obtained for each variation is 1.29 μm, 2.02 μm, and 2.20 μm. Based on the results of the study, the greater the addition of PANi composition given, the value of crystal size, grain size also increases while the value of microstructure and thickness decreases.
Analisis variasi spasial parameter seismotektonik daerah Sumatera Barat dan sekitarnya dengan menggunakan metoda likelihood Furqon Dawam Raharjo
PILLAR OF PHYSICS Vol 8 (2016)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1389.511 KB) | DOI: 10.24036/2493171074

Abstract

West Sumatra is one area with high seismic activity, so that a potentially large and damaging earthquakes. In order to understand the occurrence of large earthquakes and damage need to know the local stress conditions and the level of seismic activity by analyzing seismotectonic parameters (a-value) and (b-value). Seismotectonic parameters low (a-value) and (b-value)  can be interpreted with a low level of seismic activity and the condition of local rock high stress, otherwise the high (a-value) and (b-value). This study by using a distribution relationship with the frequency-magnitude earthquake with likelihood method and then analyzed by using software ZMAP shaped graphic user interface (GUI) -based matlab. The data used in this study taken from the USGS and BMKG with the observation period 1960 - 2015, the parameters of earthquakes with shallow depths (h) <60 km and intermediate (h) 60-350 km with a magnitude of earthquakes (M> 4.0 SR). The results show the spatial variation seismotectonic parameters low (a-value) and (b-value) at shallow depths (h) <60 km observedat southern of Nias Island, along the west coast of northern Sumatra, active faults zone north Sumatra, around the Mentawai islands and parts of Sumatra active fault zone precisely in the area of Solok and South Solok. While at intermediate depths (h) 60-350 km observed at southeastern of Batu island and the west of Padang. Thus these areas a potentially large and damaging earthquakes
THE EFFECT OF ADDITIONAL SALT AND ACID ON THE HYDROPHOBIC LAYER OF NANOCOMPOSITE SILICA/POLYSTYRENE (SiO2/PS) ON THE STABILITY PROPERTIES OF UV Yola sri Wahyuni; - Ratnawulan
PILLAR OF PHYSICS Vol 14, No 1 (2021)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/11350171074

Abstract

In nature there is a phenomenon. Which this phenomenon can be seen in the lotus leaf and taro leaves. a phenomenon called hydropobic (water repellent) properties. This research is a previous research. On application, the hydrophobic coating will mostly break down quickly when applied outside or in harsh environments. So it is very important to develop a durable hydrophobic layer, especially the stability properties against Ultra Violet (Uv). Therefore, this study aims to see the effect of adding salt and acid to the hydrophobic silica / polystyrene nanocomposite (SiO2 / PS) layer on the stability of the Uv. with a polystyrene composition of 0.5 grams and 0.2 grams of silica powder and 0.4 grams of salt and 0.4 grams of acid. The coating method used is the spin coating method and the Uv stability test on the hydrophobic layer is done by drying the layers for one hour under direct sunlight. The results of this study were the contact angle measurements using imagej software, and the crystal grain size by SEM (Scanning electron microscop). UV stability can be seen by changing the contact angle in each sample where the contact angle that can be before irradiation is acid added salt (120.1490C), salt (100.3630C), acid (128.5910C), without mixture (133.6680C) ) and after irradiation is. Salt (92.970C), unmixed (98.1440C), acid added salt (92.1150C), acid (141.5750C). These results may indicate that acid coating is more likely to use hydrophobic / self-cleaning surfaces in harsh environments such as high Uv irradiation, and outdoor applications.

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