cover
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
Pillar of Physics: Jurnal Berkala Ilmiah Fisika
ISSN : 23379030     EISSN : 26852608     DOI : http://dx.doi.org/10.24036/10741171074
Core Subject : Science,
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.
Articles 243 Documents
Analisis Nilai Absorbansi dalam Penentuan Kadar Flavonoid untuk Berbagai Jenis Daun Tanaman Obat Neldawati Neldawati
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 (230.322 KB) | DOI: 10.24036/756171074

Abstract

This research backgrounded by to the number of drug crop reported to contain compound of antioksidan in gross. Effect of antioksidan at plant caused by the existence of compound of fenol like flavonoid, and acid of fenolat. Flavonoid is an compound of fenolik biggest found by in potential nature as antioksidan and have bioaktivitas as drug. This compound can be found by at bar, leaf, fruit and flower. This research represent research of done/conducted experiment in Physics laboratory that is in Material laboratory and Biophysics, and also Chemical laboratory of FMIPA, UNP. Variables which is determined in this research that is used as by drug crop leaf type is free variable consisting of leaf of Rhaphidophora pinnata (L.f.), Piper crocatum Ruiz, Annona muricata Linn and leaf of Sauropus androgynus (L.) Merr, absorbance value as variable tied and used as by leaf mass is control variable. Each;Every sampel measured by absorbance value use spectrophotometer of Uv-Vis. Of absorbance value can be counted/calculated by rate value of flavonoid from various drug crop leaf type. From result of measurement of absorbance value got that leaf of sirih red have biggest absorbance, while absorbance of terendah there are at leaf of katuk. Of the absorbance can know by rate of flavonoid sampel. Rate of Flavonoid at each crop leaf type medicinize different each other. For the leaf of Rhaphidophora pinnata (L.f.) have rate of flavonoid about 26,7137 µ g / ml, for the leaf of Piper crocatum Ruiz have rate of flavonoid about 39,3778 µ g / ml. For Annona muricata Linn to have rate of flavonoi about 27,5027 µ g / ml and for the leaf of Sauropus androgynus (L.) Merr have rate of flavonoid about 13,1101 µ g / ml. Keywords: Absorbance, Flavonoid, Leaf Medicinize and Spektrofotometri UV-Vis
Struktur batuan pascalongsor menggunakan metoda geolistrik tahanan jenis konfigurasi Wenner (The post-landslide rock structure uses the Wenner configuration resistivity geoelectric method ) - Nizamullah; - Akmam; - Syafriani
PILLAR OF PHYSICS Vol 11, No 1 (2018)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (830.815 KB) | DOI: 10.24036/2722171074

Abstract

Malalak was located in Sumatra active fault segment that Sianok Segment. This condition caused Malalak prone to landslide hazard. Landslides a natural disasters which can lead to loss of either life or property. Based on local conditions, it  need to do  research the geological rock types making up Malalak. The objective this research was to find resistivity and structure of rock. The research that used was basic research descriptively. Measurements were made using the Geoelectrical resistivity method Wenner configuration. The interpretation of the data was used Software Res2dinv to get resistivity  and depth of rocks in 2D model cross section below the earth surface. Result of this research indicated the type of rocks in Malalak were Clay, Porphyrite, Limestone, Andesite, and Granite. Resistivity approach was derived from the five tracks were, Clay haved resistivity 9,93 Ωm – 77,3 Ωm, Porphyrite 77,4 Ωm – 216 Ωm, Limestone 216,1 Ωm – 1050 Ωm, Andesite 1050,1 Ωm – 3533 Ωm and Granite 3533,1 Ωm – 5217 Ωm.
PENDAHULUAN JURNAL Cover Dewan Redaksi Daftar Isi
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 (436.804 KB) | DOI: 10.24036/1932171074

Abstract

CoverDewan RedaksiDaftar Isi
Pembuatan tool modeling eksperimen bidang miring dengan pengontrolan sudut kemiringan otomatis untuk analisis video tracker (Experimental inclined plane modeling tool fabrication with automatic tilt angle control for video tracker analysis) Yolla Octriany; - Asrizal
PILLAR OF PHYSICS Vol 12, No 2 (2019)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (676.607 KB) | DOI: 10.24036/7519171074

Abstract

One of the experimental science knowledge of physics . Through experimental activities many motion phenomena can be observed, such as the dynamics of motion. One of the dynamics phenomenon of motion that can be done is the motion experiment in the inclined plane. From the observation results, it is known that the motion experiments on the incline were still done manually, namely changing the slope angle and measuring the time on the incline plane experiment still manually to determine the coefficient of kinetic friction, speed, acceleration, and rope tension. The previous set of sloping field experiments had limitations in displaying the results of measurements of physical quantities. One solution to solve the problem was to make modeling tool and analyze it with tracker software . The aims of this research were determine the specification of the performance of experimental modeling tools on the inclined plane, determine the value of kinetic friction coefficient, determine the value of accuracy and accuracy, and determine the effect of changes in tilt angle. This research was a type of engineering research. Engineering research is a design activity that involves things that are relatively new, both in the form of processes or products or prototypes. Data collection was done in two ways, namely through direct and indirect measurement. The direct measurement results of this research were the value of the change in the tilt angle and the indirect measurement results are the values of kinetic friction coefficient, velocity, acceleration, and rope tension in the video software tracker data analysis technique. Based on the results of data analysis four research results can be stated. First, the specification of the performance of the modeling tool on the sloping plane experimental plane with a sliding plane with a length of 50 cm and a width of 10 cm and a base with a length of 40 cm and a width of 10 cm. NEMA 17HS Stepper Motor is used for tilt angle control. Second, the value of the kinetic friction coefficient carried out with the object launch experiment was 0.265. Third, the accuracy value is 93.00% and the accuracy result is 97.00%. Fourth, the greater the tilt angle, the smaller the speed and acceleration values. The value of the rope tension, the greater the angle of inclination, the greater the value of the rope tension.
Analisis struktur bijih mangan hasil proses sinter yang terdapat di Nagari Kiawai Kecamatan Gunung Tuleh Kabupaten Pasaman Barat (Analysis of the structure of the manganese ore resulting from the sintering process in Nagari Kiawai, Gunung Tuleh District, West Pasaman Regency) Phobi Juwandari Putri; - Ratnawulan; - Gusnedi
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 (512.379 KB) | DOI: 10.24036/1835171074

Abstract

The Research to analyze the structure of manganese ore sinter processes occurring in the area Kiawai Sub Distric of Gunung Tuleh Regency of west Pasaman. In this research use XRF and XRD characterization tool. The results showed a transformation in the structure. Changes in the structure of the manganese ore minerals may occur as a result of warming temperatures. Structural changes that occur are tetragonal pyrolusite structure with a unit cell a = b 4.4000 Å and c = 2.8700 Å to the cubic bixbyite structure with a unit cell a = b = c = 9.4091 Å and then to the tetragonal hausmannite structure a = b = 5.7630 Å and c = 9.4560 Å. On the other hand also occur that the incorporation of bixbyite with a Rhodonite. Changes in the unit cell obtained by unit cell a = 7.6140 b = 11.8480 and c = 6.6990 the new braunite structure becomes tetragonal unit cell with  a = b = 9.4200 and c = 18 670
Use of TCS3200 sensor to identify heavy metal materials Kelvin Septa Dewantara; - Yulkifli
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 (267.562 KB) | DOI: 10.24036/10900171074

Abstract

v>Heavy metals are natural components that are toxic and can endanger living things even in a very smallconcentration. Water that is polluted by heavy metals in a certain concentration can harm the ecosystem andcan be fatal if entered the human organ system. The principle of heavy metal concentration measurement usingthe TCS3200 sensor is a sensor will sense the color gradation from dissolved heavy metal. This color gradationwill be calibrated to a concentration of dissolved heavy metals. Heavy metal material that is used for thisresearch were FeCl3, NiSO4, and CuSO4. Based on the analysis results, there were 4 results obtained. The firstone was performance specification from this instrument consists of a TCS3200 sensor, black acrylic box for thesensor placement. In the black acrylic box, there was a hole sample for sample placement. The second result wasthe effect of changing in heavy metal concentration to sensors output data is proportional. The third result wasan instrument calibrating with existing data. The fourth result was accuracy and precision from the instrumentwhich have been calibrated. For FeCl3 material, the average accuracy was 95.5% and precision was 98.7%.For NiSO4, the average accuracy was 96% and precision was 98.3%. For CuSO4 material, the averageaccuracy was 99.7% and precision was 99.8%.
PEMBUATAN alat penentuan percepatan gravitasi bumi menggunakan metode pendulum berbasis sensor cahaya LDR Eka Putri Rinanthy
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 (808.948 KB) | DOI: 10.24036/2488171074

Abstract

The acceleration of gravity on the second floor at laboratory of electronics and Instrumentation UNP, Padang city by gravity meter is 9.83 m/s2. The acceleration of gravity can be determined through several experiments, including experiments using pendulum method. Parameters of pendulum method still measured manually. The research was designed and created the determination of the earth's gravity acceleration appliance using a pendulum method based on light sensor (LDR). Measurement techniques directly at the output of the sensor LDR as the detector. This research is a laboratory experiment. There are three results of this research. First, performance specifications system consists of a mechanical system that pendulum framework as a holder with two boxes. Box where the circuit box system builder tool and laser as the detector. Second, the Arduino UNO microcontroller is used to process the input data determination earth's gravity acceleration appliance and the results of this research is value the acceleration of gravity on the second floor at laboratory of electronics and Instrumentation UNP, Padang city by determination earth's gravity acceleration appliance is 9,84 m/s2. Third, This instrument have highest precision and accuration, the relative accuracy of the average percentage is 99.77% with an average error of 0.23%, and accuracy average of 0.999 with a standard deviation by an average of 0.017 and a relative error an average of 0.171%.
IDENTIFIKASI JENIS BATUAN MENGGUNAKAN METODA GEOLISTRIK TAHANAN JENIS KONFIGURASI WENNER DI UNIVERSITAS NEGERI PADANG KAMPUS AIR TAWAR Elvi Novia S
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 (207.485 KB) | DOI: 10.24036/743171074

Abstract

The research about kinds of rocks has been done in Padang State University Air Tawar campus. Kinds of rocks can be determined by knowing the resistivity value. Wenner resistivity geoelectrical method was used to determine the rocks resistivity value. The research was done to determine the rocks resistivity value and kinds of rocks in Padang State University, Air Tawar campus. Automatic measurement was done using ARES (Automatic Resistivity) and interpretation of data was done using Res2dinv software and Least Square inversion. The result of data interpretation shows range of rocks resistivity value at sounding point 00053’44,0”S and 100020’79,8”E in 1st line is 0,675 – 300,1 Ωm, at sounding point 00053’53,1”S and 100021’02,8”E in 2nd line is 0,0145 – 208 Ωm, at sounding point 00053’48,9”S dan 100020’50,6”E in 3rd line is 0,118 – 243,7 Ωm, and at sounding point 00053’55,7”S and 100021’02,3”E in 4th line is 0,195 - 1842 Ωm. Kinds of rocks that are found in the research are Clays, Sandstones, Alluvium, Sands and also Groundwater.   Keywords: Resistivity geoelectrical, Wenner configuration, Rock
Analysis of Fe3O4 thin film optical properties prepared from the iron sand of Tiram Beach, Padang Pariaman Regency, West Sumatra using sol-gel spin coating method. Nidya Yulfriska; Ramli Ramli; Yenni Darvina
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 (528.824 KB) | DOI: 10.24036/2543171074

Abstract

Research on magnetic oxide is growing very rapidly. This magnetic oxide can be found in nature that is iron sand. Iron sand is a deposition of sand containing iron ore that many exist along the beach. One of the beaches in West Sumatra containing iron sand is Tiram Beach, Padang Pariaman District, Sumatera Barat. The content of iron sand is generally in the form of magnetic minerals such as magnetite, hematite, and maghemit. Magnetite contained in iron sand has excellent properties that can be developed into thin films that can later be applied to magnetic sensors. The purpose of this research is to investigate the optical properties of the Fe3O4 thin films, prepared from iron sand of Tiram Beach, Padang Pariaman District, Sumatera Barat by Sol-Gel Spin Coating Method. This type of research is an experimental research. The iron sand obtained from nature is first purified using permanent magnets, then made in nanoparticle size using the HEM-E3D tool. Then, the process of making thin film with sol-gel spin coating method. In this research variation of rotation speed of spin coating is 1000 rpm, 2000 rpm, 2500 rpm and 3000 rpm. The characterization tool in the research of optical properties analysis used is UV-VIS Spectrophotometer. The value of transmittance is 32,1%, 32,2% and 32,7% respectively. The absorbance value is 96,721% - 31,247%, 95,428% - 33,785% and 93,54% - 33,551% respectively. While the reflectance values are 33,2%, 33,7% and 34,2%, respectively. So it can be concluded that the greater the speed of rotation the thickness of the thin layer will be smaller, resulting in the transmittance and reflectance will be greater, while the absorbance will be smaller. Energy gap obtained from this research is 3,75 eV, 3,75 eV and 3,74 eV. So the average energy gap obtained is 3,75 eV
KARAKTERISASI MINERAL PADA BATU GRANIT DI SEKITAR GUNUNG MARAPI DAERAH SUMATERA BARAT MENGGUNAKAN X-RAY DIFFRACTION (XRD) Abdil Bajili
PILLAR OF PHYSICS Vol 3 (2014)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (695.345 KB) | DOI: 10.24036/1117171074

Abstract

Rock is a collection of one or more minerals which also becomes the main ingredient in the formation of the earth’s crust. The rock contains of important mineral which are widely utilized by humans in daily life and also it can be the basic ingredients for sector industry. West Sumatra is also rich of the natural sources inside the rocks in mineral form. Which is used by Seismic Method, concluded that one of the compiler layers of rock that dominated the earth’s crust in West Sumatra is granite rock. Granite is included in the type of intrusive igneous rock that process of coagulating take place under the surface of the earth and it comes out because the eruption of  volcano and the pressure in the earth.  West Sumatra is the province which has many active volcanoes, one of them is Marapi Mountain. Around the Marapi Mountain much by passed by the Fault Sumatran. So that the research purpose to determine the characterization of minerals in the granite rock surrounding Marapi Mountain using X-Ray Diffraction (XRD) and explore in West Sumatra have. X-Ray Diffraction (XRD) is the method needed to analyze mineralogy of a rock sample. The result found in the measurement is that there are Orthoclase, Quartz, Albite, Magnetite, Thorite, Ilmenite, Hornblende, Kaolinite, Muscovite, and Sodalite. With the value of susceptibility is 4,1 x 10-5 m3/kg, the value of density is 2,54 gr/cm3 and compress straight granite is 12,56 MPa. Keywords: Rock, mineral, West Sumatra, Marapi Mountain, Granite rock, X-Ray Diffraction (XRD).

Page 1 of 25 | Total Record : 243