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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 16 Documents

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Search results for , issue "Vol 1 (2013)" : 16 Documents clear

Penentuan tingkat polusi udara akibat kendaraan bermotor menggunakan metoda suseptibilitas magnetik di Kota Padang (Determination of the level of air pollution due to motorized vehicles using the magnetic susceptibility method in Padang City) Wedara Yuliatri; - Mahrizal; Fatni Mufit
PILLAR OF PHYSICS Vol 1 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

ABSTRACT Air pollution in big cities has worried. Air pollution caused by human activities such as industry, motor vehicles, burning of trash, and other activities. Air pollution caused by magnetic minerals is derived from engine frictions, corrosion of motor vehicle, and gas waste products of incomplete combustion. They fly with air and cause air pollution. Therefore research about determining pollution level from motor vehicles in Padang town was necessary. The purpose of this research was to determine the level of air pollution from vehicles motor. This research used 170 sample that consist of 99 topsoil samples, 31 leaf samples, and 40 bark samples. This research used Magnetic Susceptibility method. Magnetic Susceptibility method is used to determine the Magnetic Susceptibility value of sample. It is known by used Bartington Susceptbility Meter MS2B type. Measurement is done based on massa susceptibility value. After the Magnetic Susceptibility value is known, pollution level can be determined (low, medium or high). The result of measurement show average the Magnetic Susceptibility value in all street is 1023,2 × 10-8 – 1284,6 × 10-8 m3kg-1. It is included to high pollution category. The highest Magnetic Susceptibility value is at By Pass Lubuk Begalung street with high pollution level. The highest Magnetic Susceptibility value is at distance of 0 m from the roadside, thus 1 m from the roadside and 2 m from the roadside. Keywords: magnetic minerals, Air pollution, Magnetic susceptibility

Pembuatan sistem pengukuran jarak benda digital berbasis sensor Fluxgate (Development of a digital object distance measurement system based on the Fluxgate sensor) Rezy Prima; - Asrizal; - Yulkifli
PILLAR OF PHYSICS Vol 1 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

ABSTRACTMeasurement of the magnetic field is important because many objects have magnet and useful in life. To measure the magnetic field of an object is required a sensor. One type of sensor to detect the magnetic field is fluxgate sensor. Fluxgate magnetic sensor is a sensor that works by changing the magnetic flux around the sensor element. By utilizing the working principle of the fluxgate sensor can be madethe object distance measuring system base on digital fluxgate sensor. The purpose of this research is to determine: static characteristics of sensor fluxgate Z61, performance specifications and design specifications of the digital object distance measuring system based fluxgate sensor. Measurements of magnetic that influenced of distance from the sensor output voltage has been done. The data obtained through measurements was analyzed in two methods, those are statistics and graphs. Base on data and analysis conducted to know the sensitivity and accuracy of the fluxgate sensor Z61. Based on the data and alysisis can be presented three results. First Z61 fluxgate sensor static characteristics include transfer function of V0=0.622x 0.0245x2+3977, sensitivity S=0.049x-0622 and accuracy 0999. The second device length is approximately 30 cm with 20 cm wide with acapacity measurement of 7 millimeters to 15 millimeters by using a magnet as the source of the magnetic field, Z61 type fluxgate sensors, a micrometer screw and microcontroller ATMEGA 8535. Third design specifications of the digital object distance measuring system based fluxgate sensor consists of a percentage error of 12%, precision 0.875 and accuracy 0.831. Keywords: measurements system, magnetic field, fluxgate sensor

Kajian kapasitansi membran akibat variasi massa kitosan (Study of membrane capacitance due to mass variation of chitosan) Monicha Esti; - Gusnedi; - Ratnawulan
PILLAR OF PHYSICS Vol 1 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

ABSTRACTMembrane is a layer that separates the two phases and organize mass transfer of the two phases were separated. Chitosan can be used as materials for membrane by dissolving chitosan powder in acetic acid 1 %. To obtain membranes that have good physical qualities, it is necessary to research on the physical properties of membranes. This type of research is experimental research with samples of chitosan membranes made of chitosan powder with chitosan mass variation is used as the membrane are 2 grams, 3 grams, 4 grams, 5 grams and 6 grams. Membrane capacitance values can be measured directly using the LCR meter 827. The highest value membrane capacitance is 6.10 ± 0.01 pF with a mass of chitosan used as membrane is 6 grams at frequency 1 kHz. Membrane capacitance values have a tendency decreases with higher frequency. The highest value capacitance chitosan membrane after immersion in a solution of 20 mM KCl is 7.90 ± 0.01 with a mass of chitosan used as membrane is 4 grams at frequency 1 kHz. Based on the research can be obtained an effect of mass of chitosan used as membrane due to capacitance chitosan membrane.Keywords : Membrane, Capacitance, Chitosan

Pengembangan prototipe sistem pengukuran KWH meter digital presisi komunikasi dua arah menggunakan short message service berbasis Mikrokontroler AT89S52 dan Atmega16 (Development of a two-way communication precision digital KWH meter measurement system prototype using a short message service based on the AT89S52 and Atmega16 microcontroller) Yosep Permana; - Asrizal; Zulhendri Kamus
PILLAR OF PHYSICS Vol 1 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

ABSTRACTMeasurement system of electrical energy of PLN customers is done manually can cause errors. These Errors can occur when reading the data of KWH meter and entering the data into customer database system. Based on this fact development of automatic KWH meter with Short Message Service is important. Digital KWH meter can measure electrical energy more precise, turn off electricity automatically and turn on it base on a database. In general, this research intend to design and develop a digital KWH meter with measurement system using the short message service with two direction of communication base on microcontroller AT89S52 and ATMega16. The data obtained through measurement is analyzed in two methods, namely by statistics and graphs. There are four results of this research, those are : 1. KWH meter consists of two parts, namely KWH Meter Digital System and System server for database, 2. Accuracy from rotation disk value, KWH value and cost of customer each are 100%, 99.30% and 100%, Precision from rotation disk value and KWH value each are 1 and 0.99, 3. Time to send data KWH to copy into customer database is 37.65s, 4. Time to turn of and turn on KWH meter each are 11.97s and 19.15s. Keywords : KWH meter, optocoupler sensor, short message service

Analisis variasi curah hujan harian untuk menentukan ragam osilasi atmosfer di Kota Padang (studi kasus data curah hujan harian tahun 2002-2011) (Analysis of variations in daily rainfall to determine the variety of atmospheric oscillations in the city of Padang (case study of daily rainfall data for 2002-2011)) Anggia Arista; - Asrul; Sugeng Nugroho
PILLAR OF PHYSICS Vol 1 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

ABSTRACTThe rain is the important thing in the human life. The higher rainfall can influence the public activities in many life area. They factors that influence rainfall are geographic position in a region and atmosphere phenomenon. Many atmosphere oscillation phenomenons are MJO, SAO, AO, QBO and ENSO. By knowing the phenomenon or oscillation of atmosphere are happened in a region can give the benefits for the human. Because of that the writer interested to do a researche about Analisys of Rainfall’s Daily Varian to Determine Atmosphere Oscillation Variation in Padang by using detailed result of rainfall in Padang on periode 2002-2011. This researche is a descriptive researche the data are used in this researche is the detailed result of daily rainfall in Padang from BMKG Tabing that have been taken from 2002 to 2011. The determination of rainfall’s variation can be proceed by using exel program and determination of oscillation manner can be determinate by using WWZ program an serfer 7. Based on analisys of rainfall’s data are gotten that highest rainfall’s happened in March and September while oscillation manner are gotten that they are oscillation of daily atmosphere or MJO, seasonal oscillation (SAO), annual oscillation (AO) and quasi biennial oscillation (QBO). Dominant oscillation manner was happened in Padang is the atmosphere oscillation type MJO that 25 times happen in range of time 2002-2011. Keywords: Rain, oscillation, phenomenons of atmosphere

Pengaruh pengukuran sifat fisis dan sifat mekanis papan partikel sampah daun kering berdasarkan ukuran butir (The effect of measuring the physical properties and mechanical properties of the dry leaf waste particleboard based on grain size) Ade Usra Berli; Yenni Darvina; - Yulkifli
PILLAR OF PHYSICS Vol 1 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

ABSTRACT Utilization of leaf waste processed a drop of without development in the processing. The thought of leaf waste can be processed to become products of economic value, one used as raw material similar lightweight particle board, particle board can be used as a substitute for wood. Particle board manufacturing is done by printing the leaf waste that has been mixed with a binder or adhesive. Adhesives used as binder is polyvinyl acetate (PVAC). Leaf waste material made with a variety of different grain sizes are 1.7 mm, 2.8 mm and 4.75 mm. Particle board manufacturing process is done by inserting the material into the machine hot press with pressure 330 x 104 kg/m2 at 100 ° C for 20 min. From the testing of physical and mechanical properties, obtained the following results: for the physical properties of particle board dry leaf waste, the small grain size of particle board then dried leaf waste moisture content decreases while the value of the density and thickness development is increasing. For the mechanical properties of particle board, the small grain size of particle board then the value of flexural strength and compressive strength increased. Test results obtained water content and density to meet the Standar Nasional Indonesia (SNI 03-2105-2006), while the value of developing strong and thick flexible does not meet the Indonesian National Standard (SNI 03-2105-2006). For compressive strength values no set of Standar Nasional Indonesia. Grain size optimal particle board in this study is the size of a small grain size of 1.70 mm. Keywords: Leaf of Mangoes, polyvinyl acetate (PVAc), Particle board

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.

Pengaruh kerapatan terhadap koefisien absorbsi bunyi papan partikel serat daun nenas (Ananas comosus L Merr) (Effect of density on sound absorption coefficient of pineapple leaf fiber particle board (Ananas comosus L Merr)) Wahyudil Hayat; - Syakbaniah; Yenni Darvina
PILLAR OF PHYSICS Vol 1 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

ABSTRACTThe main objective of this study was to determine the effect of density on board sound absorption coefficient of the particle board pineapple leaf fiber which will be applied as a silencer. Preparation of the sample begins with the separation of basic ingredients, followed by the manufacture of rectangular samples with a size of 9 × 9 × 0.5 cm using a machine felts, then the acoustic characteristics of the specimens were tested using a resonance tube. From the research that has been done can be concluded that at low density the greater the density of the sound absorption coefficient of the particle board pineapple leaf fiber, the greater the coefficient absorbsinya. At high density, the sound absorption coefficient down.Keywords: absorption coefficient, pineapple fiber, acoustic material.

PENDAHULUAN JURNAL Daftar Isi Daftar Isi
PILLAR OF PHYSICS Vol 1 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Cover, Dewan Redaksi, Daftar Isi

Pengaruh variasi suhu annealing terhadap struktur dan ukuran butir silika dari abu tongkol jagung menggunakan X-Ray Diffractometer (The effect of annealing temperature variations on the structure and grain size of silica from corn cobs ash using X-Ray Diffractometer) Yoza Monalisa; Djusmaini Djamas; - Ratnawulan
PILLAR OF PHYSICS Vol 1 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

ABSTRACTThe development of technology and the use of silica in the industry is increasing, especially in the use of silica in the small particle size to the scale of microns or even nanosilika. The increasing need for silica it is necessary to find alternative materials that can be updated to produce silica. One is corn that has not been optimized. This research aims to investigate the structure and grain size of corn cob ash. This research is a form of experimentation with free variable 10000C annealing temperature and 11000C with a time of 6 hours of detention, control variables such as the mass of corn cobs, chemicals, and filter paper used. The dependent variable measures the levels of silica and silica crystals. Ash obtained was analyzed by gravimetric methods. Later in the annealing temperature of 10000C and 11000C for 1 hour will be obtained silica powder. Silica powder obtained by XRD to determine the crystal structure and the determination of the crystal grain size using Equation Schherer. After data collection and analysis of data obtained from crystalline silica structure is a diamond cubic structure with lattice parameter (a) is 7.01 Å. Grain size of the smallest crystals obtained at 11000C annealing temperature is 11.38 nm and the size of the crystal grain size of the greatest at 10000C annealing temperature is 40.83 nm. Keywords: grain structure, grain size, diffraction

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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