Garuda - Garba Rujukan Digital

Article Per Year (5 Year)

All

Pillar of Physics: Jurnal Berkala Ilmiah Fisika

fis
Website

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

17 18 19 20 21

Penyelidikan struktur batuan menggunakan metoda geolistrik tahanan jenis konfigurasi wenner inversi robust constraint di Jorong Koto Baru Nagari Aie Dingin Kabupaten Solok Sri mulyani
PILLAR OF PHYSICS Vol 8 (2016)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Rock structure in Jorong Koto Baru has not been known and analyzed. Furthermore, it is significant to conduct a research which was purposed to find the structure of rock in Jorong Koto Baru, Nagari Aie Dingin, Kabupaten Solok. The measurement used Resistivity Geoelectrical method with Wenner Configuration. The data were analyzed and interpreted by using Robust Constrain Inversion in software Res2dinv to obtain 2D model. This research indicated that there are five types of rocks which had formed in Jorong Koto Baru, Nagari Aie Dingin, Kabupaten Solok. They are Sands, Clay, Sandstone, Limestone, and Granite. Sandstone, Limestone and Clay dominate rock structure in Jorong Koto Baru

Kajian sifat konduktansi membran kitosan pada berbagai variasi waktu perendaman dalam larutan Pb (Study of the conductance properties of chitosan membranes at various immersion times in Pb solution) Mella Roza; - Gusnedi; - Ratnawulan
PILLAR OF PHYSICS Vol 1 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Chitosan membrane is capable of being used as adsorbent adsorption of metal ions Pb. Assessment of the electrical properties of the chitosan membrane is one see references in the membrane as ability adorpsi metal ion weight. The purpose of this study to determine the nature of the conductance of chitosan membranes useful to look at the ability of the membrane chitosan as the adsorption of metal ions Pb. This research is experimental research with samples of chitosan membranes were soaked in a solution of Pb metal. The time variation of soaking the membrane is 0.5 hours, 1 hour, 1.5 hours, 2 hours, 2.5 hours, 3 hours and without soaking. The measurement results for the effect of soaking variation time chitosan membrane. Pb metal in solution obtained current-voltage characteristics of the membrane in the solution is linear, the longer soaking in a solution of Pb metal, the greater the current flow. The longer the time soaking in a solution of Pb chitosan membrane, then the greater the value of the conductance. Keywords : Chitosan, Membrane, Adsorption, Conductance, Metal Pb

The estimation of maximum ground acceleration value in West Sumatra region based on the M 8.8 SR earthquake scenario using MC Guire (1963) and Donovan (1973) empirical formula. Mia Leviana; Syafriani Syafriani; Ardiyansyah Sabarani
PILLAR OF PHYSICS Vol 10 (2017)
Publisher : Department of Physics – Universitas Negeri Padang UNP

West Sumatra is one of the regions is prone to earthquakes because it the positions of an active seductions zone between the Indo-Australian plate and the Eurasian Plate is along the Sumatra fault. The maximum ground acceleration is one of the important parameters, because it describes the strength of earthquake vibration ever happened. Therefore, it is necessary to do measurement and calculation of ground acceleration caused by earthquakes. By knowing the maximum ground acceleration values in an area, we can know which area is prone to earthquakes. Data were analyzed by an earthquake scenario is created, and the epicenter 1.00o LS 99.00o BT, M = 8.8 magnitude and a depth of 30 km. Formulation of Mcguire (1963) and Donovan (1973) is used to find the value of the maximum ground acceleration and Murphy O'Brein empirical formula to find the value of intensity. The maximum ground acceleration value for each county / city in West Sumatra is calculated by using the position of the district / city as a reference point. The results of data processing maps obtained Peak Ground Acceleration (PGA) and the intensity of the earthquake. The analysis showed that the value of the PGA and the greatest intensity being Pariaman with a value PGA 177.59 gal and has a value of 7.67 MMI intensity. Then the value of the maximum ground acceleration both owned by the Mentawai Islands with 176.72 gal and intensity value is 7.66 MMI.

Pengaruh Viskositas Fluida Terhadap Sifat Hydrophobic dari Berbagai Macam Daun Dahlia Gusrita
PILLAR OF PHYSICS Vol 3 (2014)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Most human uses material is a material that is susceptible to liquid. The risk of material quickly and easily damaged when exposed to dirty liquid. Each liquid has a viscosity different, so it needs some information about the characteristics of the material is hydrophobic in nature to be applied in the manufacture of the material. The purpose of this study was to determine the effect of fluid viscosity on the hydrophobic properties of various kinds of leaves. From this research, the contact angle values obtained on average at each leaf with a variation of fluid distilled water, grease and oil . Value of the average contact angle generated at each sample starfruit leaves, cassava leaves and leaf velvetleaf with distilled water fluid (η=0.0538Ns/m2), oil (η=0.1352Ns/m2), and oil (η=0.1835Ns/m2) respectively were 122.3500, 49.7200 and 43.7500 on the leaves starfruit, 127.4400, 49.4200 and 26.1500 in the cassava leaves, 131.9200, 45.5600 and 17.700 in the leaves of velvetleaf . So this study shows that the viscosity of the fluid affect the value of the contact angle and hydrophobic properties, ie the greater the viscosity the smaller the contact angle and hydrophobic properties on the wane . Keywords: Hydrophobic , contact angle , viscosity , Genjer leaves , Carambola Leaves , Leaves Cassava

Pengaruh komposisi CoFe2O4 terhadap sifat listrik nanokomposit CoFe2O4/pani yang disintesis dengan metoda sol-gel (CoFe2O4 composition influence on the electrical properties of the CoFe2O4 / PANI nanocomposite synthesized by the sol-gel method) Fildzah Rudyah Putri Nurzam; - Ramli; - Ratnawulan
PILLAR OF PHYSICS Vol 12, No 1 (2019)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Nanocomposite ofCoFe2O4-polyaniline (CoFe2O4/PANi) with various variationsCoFe2O4 and PANi 20%, 30%, 35%, 40%, 50% which was synthesized by sol-gel method. Samples are characterized by X-ray difractionandLCR meterwith CoFe2O4compositions 20%,30%,35%,40% and 50%. Nanocomposites of CoFe2O4/PANi in prepares using sol-gel method wih precursors Fe(NO3)3.9H2O and Co(NO3)2.6H2O with PANi.The Samples the gel shaped thin layer of nanocomposite is characterized usingX –Ray Difraction and LCR meter. The XRD characterization results obtained the crystal size values on the composition variations is 44,86 nm, 39,86 nm, 41,47 nm, 59,65 nm, 57,42 nm and LCR meter characterization have value is 12,2x10-9 F, 11,2x10-9 F, 10,8x10-9 F, 9,6x10-9 F, 7,3x10-9 F. Variations in composition of nanocomposite CoFe2O4/PANi affect the value of crystal size and electrical properties of nanocomposites CoFe2O4/PANican be applied to supercapasitor.

Pengaruh tinggi kolom pada distilasi terhadap kadarbioetanol dari tebu (Saccharum officinarum) (Effect of column height on distillation on bioethanol levels from sugarcane (Saccharum officinarum) Mely Afriani; - Gusnedi; - Ratnawulan
PILLAR OF PHYSICS Vol 5 (2015)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Bioetanol is the altenative fuel from raw material plant that contains carbohydrate which is the sugarcane plant. The making of biooetanol from sugarcane plant done by the process of distillation. The process of distillation is how separation of liquid from its alloy based on difference in boiling point or based on the ability of a substance to evaporate. The process of distillation unit is referred to as a distillation column. Distillation columns can separate between ethanol and water. The research aims to know the influence of high columns against the resulting bioetanol levels on sugarcane juice. Result on measurement levels bioetanol for each variation of the height of the column is obtained as follows: for the column height of 0 (No column) there are levels of 35%, for the column height of 0,5 metres there are levels of 75%, for the column height of 1 metre there are levels of 86%, and for the column height of 2 metre there are levels of 87%. In this research founded high distillation column influence against the increasingly high levels of bioetanol distillation column which then levels will be higher because bioetanol in column a different pressure loss occurs and the rate of ethanol vapor

Pengembangan digital resistivity meter multielektroda otomatis untuk konfigurasi Schlumberger (Development of an automatic multi-electrode digital resistivity meter for the Schlumberger configuration) Erin Ficrah Huda; - Yohandri
PILLAR OF PHYSICS Vol 13, No 1 (2020)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Prototype digital multi-electrode automatic resistivity meter is a prototype that is used to measure ground resistivity with 16 electrodes based on the ohm law principle. By selecting four electrodes as a measuring point, then injecting voltage through the two current electrodes, the potential difference between the two electrodes can be detected. Current and voltage data obtained can determine the value of resistivity or soil resistivity. This research is a type of research and development that functions to develop existing products. From the results of the study, it can be stated four results consisting of internal testing results, product manufacturing results and initial field testing results or limited trials. The results of internal testing are looking at the characteristics of the current detection circuit, then testing the relay module and multiplexer module. The products are made up of prototype boxes, cable electrodes, 16 nail electrodes and, 12-volt batteries. Preliminary field test results on a laboratory scale for current and voltage measurements with error percentages from 0,8% to 31,8% and 0,098% to 11,76%, respectively. Limited field test results for resistivity measurements at three different locations obtained an average accuracy of 78,05%; 78,89% and 84,05%, respectively. While the average accuracy was 77,50%, 99,74% and 99,41%, respectively.

Pengaruh variasi suhu karbonisasi terhadap mikrostruktur dan derajat kristalinitas karbon aktif kulit singkong sebagai bahan dasar GDL (Gas Diffussion Layer) (The effect of variations in carbonization temperature on the microstructure and degree of crystallinity of the activated carbon of cassava peels as the basic material of GDL (Gas Diffusion Layer)) Vathasia Kartika
PILLAR OF PHYSICS Vol 7 (2016)
Publisher : Department of Physics – Universitas Negeri Padang UNP

The energy crisis is an old problem that has continued until today. Fuel Cell is one answer to solve the problem of this energy crisis. One type of fuel cell that is growing up now is the PEMFC (Proton Exchange Membrane Fuel Cell). The main components that play an important role in the PEMFC is the GDL (Gas Diffussion Layer). GDL important role in the electron transfer process, so the material must essentially activated carbon which has a high absorption. Activated carbon is commonly used CNT (Carbon Nano Tube) are hard to get and expensive. Peel cassava is one of the alternative carbon sources that can be processed into activated carbon. This study aims to determine the effect of carbonization temperature on the microstructure and the degree of crystallinity of activated carbon cassava peel. Variations carbonization temperature are 300 0C, 400 0C and 500 0C. Activated carbon microstructure characterization of cassava peel is done with SEM (Scanning Electron Microscopy), while the characterization of the degree of crystallinity is done by XRD (X-Ray Diffraction). The results showed that the size of the pores formed is still relatively macropore is greater than 0.5 micrometers, whereas the calculation of the degree of crystallinity for each of the various samples were 36.64%, 30.20% and 30.54%. Shell activated carbon potential of cassava as a raw material GDL is based on the degree of crystallinity, but still do not meet the standards based microstructures are formed

Fabrication of a pressure gauge for the mosquito artery clamp based on the LJ12A3-4-Z / BX proximity sensor Novella Febriana; Yulkifli Yulkifli; Ratnawulan Ratnawulan
PILLAR OF PHYSICS Vol 9 (2017)
Publisher : Department of Physics – Universitas Negeri Padang UNP

This research aims to design and develop a pressure gauge on the mosquito arterial clamp based on LJ12A3-4-Z/BX proximity sensor and to determine the performance specifications and proximity sensor-based equipment specifications LJ12A3-4-Z / BX. This study was engineering. The data collection done by measured the direct and indirect measurement.. Direct measurements carried out on proximity sensor output npn type LJ12A3-Z / BX, while indirect measurements carried out to determine the accuracy and precision of the instrument pressure gauge. The data obtained through the measurement was analyzed in two ways, namely by statistics and graphs. Based on data analysis that has been done can be put forward three important results. First, spesification of system performance pressure gauges at the arterial clamp LJ12A3 proximity sensor-based mosquito-Z / BX consists of a mosquito artery clamps connected by a proximity sensor type LJ12A3 npn-Z / BX and a box. Second, used to process the input data and processing data of sensor measurement data by the Arduino Uno microcontroller was. Third, this sensor has a sensor that outputs a value inversely proportional to the frequency of the pressure on the clamps are used, with the slope of 0.386. Meanwhile, the coefficient of determination obtained a straight line approach around 0.876. The resulting clamping pressure is inversely proportional to the value of the slope of the graph of No - 1,074. Through with the near of straight line coefficient of determination of the chart of 0726

Analisis Penambahan Gula Jagung Terhadap Karakteristik dan Degradasi Plastik Biodegradable Air Pati Ubi Kayu (manihot utilissima) Miftahul Jannah
PILLAR OF PHYSICS Vol 3 (2014)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Currently of materials used to package food and drink one of them is plastic. Along times, needs of plastics is increasing in many areas of life. The other, the use of plastic as a packaging material dealing with environmental issues, which can not be explained naturally by microbes in the soil. This leads to the buildup of plastic wastes that causes pollution and damage to the environment and also has a negative effect on human life. To reduce such problems, find solutions to make environmentally friendly plastics are biodegradable and do not spread pollution, the biodegradable plastic. Plastic biodegradable this study with the addition of corn sugar, 1g, 3g, 5g, 7 g and 9 g. Tests were carried out to obtain the value of flexural strength and degradation of biodegradable plastic water cassava starch as follows: corn sugar obtained without the addition of flexural strength kg/m2 8.81 x 103, 6.76 x tensile strength 103 kg/m2, 29.26% degradation. On the addition of 1g flexural strength obtained 19.03 x 103 kg/m2, tensile strength is 4.26 x 103 kg/m2, 11.88% degradation. On the addition of 21:26 flexural strength obtained 3g x 103 kg/m2, tensile strength is 2.82 x 103 kg/m2, 10:10% degradation. On the addition of flexural strength obtained 5g 29.20 x 103 kg/m2, tensile strength x 103 kg/m2 9:49, 7:01% degradation. For additional flexural strength values obtained 7g 32.61 x 103 kg/m2, 12:18 tensile strength x 103 kg/m2, 6:59% degradation. On the addition of flexural strength obtained 9g 35.94 x 103 kg/m2, 13:46 tensile strength x 103 kg/m2, 5:01% degradation. Biodegradable plastic addition of cassava starch corn sugar has a value of flexural strength and tensile strength is good but slow degradation. Keywords:BiodegradablePlastic, CornSugar, Mechanical PropertiesandDegradatio

Page 19 of 30 | Total Record : 297

17 18 19 20 21

Filter by Year

2013 2025

Filter By Issues

All Issue Vol 18, No 1 (2025) Vol 17, No 2 (2024) Vol 17, No 1 (2024) Vol 16, No 2 (2023) Vol 16, No 1 (2023) Vol 15, No 2 (2022) Vol 15, No 1 (2022) Vol 14, No 2 (2021) Vol 14, No 1 (2021) Vol 13, No 2 (2020) Vol 13, No 1 (2020) Vol 12, No 2 (2019) Vol 12, No 1 (2019) Vol 11, No 2 (2018) Vol 11, No 1 (2018) Vol 10 (2017) Vol 9 (2017) Vol 8 (2016) Vol 7 (2016) Vol 6 (2015) Vol 5 (2015) Vol 4 (2014) Vol 3 (2014) Vol 2 (2013) Vol 1 (2013) More Issue

Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

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

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Home Page

OAI Link

Editorial Team

Contact

Reviewer

Google Scholar

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

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

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