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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 8 Documents
 1 
Search results for , issue "Vol 15, No 2 (2022)" : 8 Documents clear
Application of Rock Magnetic Methods to Landslide Disaster Vulnerability: a Case Study (Malalak, Agam Regency) Cindy Rara Silvia; Hamdi Rifai; - Akmam
PILLAR OF PHYSICS Vol 15, No 2 (2022)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/13024171074

Abstract

Malalak is a landslide-prone area that has an undulating hilly topography with a height of more than 850 meters above sea level. Landslide potential can be determined by the value of magnetic susceptibility Percent Frequency-Dependent Susceptibility (%). The study was conducted on slopes where landslides have occurred (A) and have not occurred (B) using the rock magnetism method to compare the potential for landslides on the slopes. Soil that has been taken and measured using a Bartington Magnetic Susceptibility Meter sensor type B (MS2B), the measured values are analyzed and interpreted to see a comparison between two different samples. The results showed that the value of low-frequency magnetic susceptibility () ranged from 447.5-698.8× with an average of 580.6×, it is estimated that the magnetic mineral is ferrimagnetic with the type of mineral Hematite (Fe2O3). The graph of the relationship between the values of lf and fd% on slope A has a value of % > 2% and a slope B of % < 2%. Slope A contains superparamagnetic grains between 10%-75% which is a mixture of fine and coarse-sized superparamagnetic grains, while slope B does not exist or contains less than 10% superparamagnetic grains. The samples with high superparamagnetic grain content were almost all fine-grained soils which caused the level of soil mineral attachment by water to decrease. So that when the rainfall is high, the soil becomes saturated and accumulates on the slip plane, causing lateral movement on the slopes and landslides to occur
Development of Solar Radiation Intensity Measurement Tool Using BH1750 Sensor Based on The Internet Of Things with Smartphone Display Alex Sandryadi; - Yulkifli; - Yohandri; Heron Tarigan
PILLAR OF PHYSICS Vol 15, No 2 (2022)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/13571171074

Abstract

This research aims to determine the performance and design specifications of the system measuring the intensity of solar radiation using BH1750 sensor based on  internet of things with smartphone display. In agriculture, Soil fertility is closely related to maximum yield. Soil fertility and plant growth are determined by many factors, one of the most important is the intensity of solar light. The tools used in the field are still quite simple, where to measure the intensity of solar light still using a lux meter and even though the data read  from a digital lux meter cannot be seen anywhere. This measuring instrument is built using the BH1750 sensor, namely as a sensor of solar radiation intensity, NodeMCU ESP8266 as a microcontroller programmed using the Arduino IDE programming language to access the internet network so that it can be sent to the Thingspeak server, and data from Thingspeak is displayed on an Android smartphone using the APP Inventor application, and the data can be displayed. displayed on the Thingspeak server, and also can be stored in memory Micro SD. Based on the results of the development of a measuring instrument for the intensity of solar radiation, it is obtained Data where the highest solar intensity occurs on average between 02.55 – 03.38 UTC ± 0 and between 04.00 – 06.20 UTC ± 0, Each plants has a different need for solar intesity  for photosynthesis because the more solar that is sufficient on the plant, so the plants it will become optimal growth.
Effect of Calcination Temperature on Microstructure, Porosity and Hardness of Cao/Sio2 Nanocomposites for Bone Implants Wardatul Ullya; Riri Jonuarti; - Ratnawulan
PILLAR OF PHYSICS Vol 15, No 2 (2022)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/13872171074

Abstract

This research is a study on the effect of calcination temperature on microstructure, porosity, and hardness of CaO/SiO2 nanocomposites for bone implants made from natural materials of pensi shells and silica sand. The purpose of this study was to determine the effect of variations in calcination temperature on the morphological analysis of structural form, porosity, and hardness of CaO/SiO2 nanocomposites in samples for biomaterials and to determine whether CaO/SiO2 nanocomposites derived from pensi shells and quartz sand are possible to be applied as biomaterials. The results showed that the effect of variations in calcination temperature on the microstructure of bone implant samples was that the higher the calcination temperature would affect the microstructure's shape on the surface of the model where the surface formed was widening, and the grain size was getting smaller. In the porosity, it can be seen that there is diffusion between one grain and another. The grains melt with each other and close the pores from the outside, resulting in compaction at a temperature of 1000°C with a porosity value of 0.005% and the best hardness value of 4.8 kg/mm2.
Scanning Electron Microscopy for Nanostructure Analysis of Hybrid Multilayer Coating Debi Rianto
PILLAR OF PHYSICS Vol 15, No 2 (2022)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/14084171074

Abstract

Scanning Electron Microscope (SEM) has been used in various studies to retrieve detailed information on nanomaterial structure. This study is an effort to propose SEM as the proper tool to investigate the properties of Hybrid Multilayer Coating as our model. The analysis should include nanoparticle size and its distribution on the surface, the thickness of the layers, the chemical composition and the crystal grain size in the layers. Several methods in SEM are beneficial to characterize these features are topography image, compositional image, X-Ray Spectrometry and Electron Backscattered Diffraction pattern. This technique also has several limitations ranging from chemical sensitivity, resolution to sample preparation
Microwave Absorption Properties of Graphene Oxide Derived from Coconut Shell Waste by Modified Hummer's Method Nadia Ardianti; Yenni Darvina; Fadhila Ulfa Jhora; - Ramli
PILLAR OF PHYSICS Vol 15, No 2 (2022)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/12601171074

Abstract

Coconut shells are organic waste, so they can be used as an alternative for carbon source. In this study, the synthesis of graphene oxide (GO) from coconut shell waste will be carried out. The results of the synthesis of GO will then be tested for microwave absorbing properties because it can be applied in various fields, such as information technology, medical equipment, industry, polymer synthesis, and organic synthesis. GO synthesis was carried out using the modified Hummers method. There are several stages in this study, namely the stage of preparing old coconut shells, the stage of carbon activation, the stage of GO synthesis, and the stage of sonication and neutralization of GO. The coconut shell was treated with variations in the sintering temperature to see its effect on the microwave absorbing properties. The sintering temperatures used in this study were 250°C, 300°C, 350°C, 400°C, and 450°C. GO characterization was carried out using X-Ray Diffraction (XRD), Fourier Transform Infra-Red (FTIR), and Vector Network Analyzer (VNA) to determine the phase, functional groups, and microwave absorption properties of GO. In the results of GO characterization using VNA, it was found that there was an effect of temperature variations. GO can be synthesized from old coconut shell waste using the modified Hummers method and has a GO phase result. The best microwave absorbing properties are at a sintering temperature of 400°C with a reflection loss value of -24.40 dB. Absorbing coefficient 93.97% at 10.40 GHz
Iot-Based Blood Pressure and Body Temperature Monitoring System Guruh Eko Saputro; - Yohandri; - Mairizwan; Elsa Yuniarti
PILLAR OF PHYSICS Vol 15, No 2 (2022)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/13450171074

Abstract

Health is an essential element that humans must consider. Examination of vital signs has two critical parameters in the diagnosis: blood pressure and body temperature. Blood pressure is a critical factor for the circulatory system. There are two types of blood pressure, namely systolic and diastolic. Body temperature is a measured body temperature expressed in degrees Celsius (℃). We developed an IoT-based blood pressure and body temperature monitoring device using MPX5100DP & DS18B20 sensors. The measurement carried out by comparing pressure and temperature data with standard tool, it was found that the percentage level of accuracy of the average pressure of 96.26% and temperature of 98.61%. Accuracy data were obtained for pressure measurement is 93.01% and for temperature measurement is 99.91%. The error on the device are found to be 2.96% systolic pressure, 3.29% diastolic pressure, and 0.63% body temperature. According to that, developed blood pressure and body temperature monitoring tool can work satisfiedly
Effect of Air Temperature, Air Humidity, and Air Pressure on Rainfall Based on Measurement Result in Kototabang Syahrul Gunawan; - Asrizal; - Hufri; Letmi Dwiridal; Ikhsan Buyung Arifin; Fahmi Rahmatia
PILLAR OF PHYSICS Vol 15, No 2 (2022)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/13007171074

Abstract

Weather has a close relationship with community activities in Kototabang. Weather information can be used so that the risk of crop failure and disaster hazards can be minimized. Research to investigate the relationship of weather parameters was carried out using descriptive research with the multiple linear regression method. The variables in this study were divided into independent variables of air temperature, air pressure, and humidity, and the available variable was rainfall. The research method used is a multiple linear regression method with secondary data measurement of AWS and AAWS in Kototabang. The multiple linear regression method aims to predict values based on independent variables. The characteristic of this method is the presupposition variable used by more than one variable. The data processing technique applied was a multiple regression linear with three predictors (temperature, humidity, and air pressure) with the characteristics of three predictors. The purpose of the translation technique, in general, is to describe the effect of the predicted parameters on rainfall. From the output obtained, it is explained that there is a positive contribution from the predictive variable to rainfall. The correlation that occurs from the output is also very strong, reaching an output value of 99.1%. Simultaneously and partially explained that there is a large enough change in the presumed parameters (air pressure, temperature, and humidity) to rainfall. This proves that there is a very rapid change between pressure, humidity, and air temperature to rainfall in Kototabang in 2020.
The Effect of Fly Ash Composition on The Hydrophobic Absorption, and Strength Properties of Concrete Asri Vauzia; - Ratnawulan
PILLAR OF PHYSICS Vol 15, No 2 (2022)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/12978171074

Abstract

The use of concrete in buildings that indicate direct contact with water such as concrete preparation and roof requires waterproof concrete. The air entering the concrete through the capillary tubes formed during the formation process can be reduced by reducing the diameter of the microcapillary. Fly Ash is an additive that has seeds that are smaller than cement. After the fly ash in the concrete mixture reacts with cement and water, the diameter of the microcapillary formed will be smaller. The purpose of this study is to determine the effects of variations in the composition of flying ash on the hydrophobic, absorption, and concrete strength. Variations in the composition of flying ash are 0%, 5%, 10%, 15%, and 20%. Based on the test, the percentage of absorption in concrete aged 7 reached an optimal value at 5% percentage of flying ash with a value of 0.363%, whereas in concrete aged 14 days optimal value is obtained at the percentage of flying ash 5% with a value of a 0.5%. The biggest contact angle for the variation of 0% flying ash at the age of 7 days is 128.79⁰ and the lowest value for the variation in flying 15% is 100.41⁰. The highest compressive strength value occurs in the percentage of flying ash at 0% is 30,945 in 7 days of concrete age, and the lowest concrete compressive strength value is the percentage of fly ash at 15%, namely 16.05 MPa for concrete age 14 days

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