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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 2 (2013)" : 16 Documents clear

PENGARUH WAKTU PERENDAMAN BAJA DENGAN EKSTRAK BUAH PINANG DAN HCl TERHADAP LAJU KOROSI DAN POTENSIAL LOGAM Mega Wahyuni
PILLAR OF PHYSICS Vol 2 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Corrosion can not be prevented but rates can be reduced. One of the most effective ways to reduce the rate of corrosion is the use of organic inhibitors. The purpose of this study was to of this study was to obtain a corrosion inhibitor inexpensive and non-toxic. This research is experimental research with a sample of ASSAB 760 leading edge of materials that are medium carbon steel. immersioning steel with inhibitor in two ways, namely steel immersion areca extracts for 24 hours, then immersion with HCl (with inhibitor method I). Steel immersion with HCl + areca nut extract (with inhibitor method II). The independent variable is the variation of immersion time. The dependent variable such as the rate of corrosion inhibitor efficiency, potential. Control variables such as the type of steel used, the concentration of HCl, inhibitor concentration and temperature. By using this method of weight loss obtained corrosion rate and inhibitor efficiency. Potential metal obtained by direct measurement. From the results obtained with inhibitors steel immersion in acidic environments means I have a higher efficiency than soaking the inhibitor method II. From the overall results of the study showed that areca nut extract is an effective corrosion inhibitor for steel in acidic environment, because it can inhibit the corrosion rate with an efficiency of 61.31% - 74.56% by immersioning 12 hours, 24 hours and 36 hours. Keywords: medium carbon steel, areca nut extract, organic Inhibitor, weight loss method, immersion time.

Pengaruh Logam Berat Terhadap Sifat Fisis Pemancaran Cahaya dari Bioluminisensi Kunang-kunang (Pteroptyx tener) Melly Sarvida
PILLAR OF PHYSICS Vol 2 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Heavy metal is environmental factor which influences the relative intensity of firefly light. Heavy metal in firefly body is estimated to be able to decrease the intensity of light produced. This research will discuss the influence of heavy metal toward bioluminescence reaction of firefly. It starts from the influence of heavy metal type and concentration toward intensity, inhibition coefficient and the influence of molecule weight with bioluminescence inhibition coefficient of firefly. This research is an experimental research conducted in Material Physics and Biophysics Laboratory and Chemistry Laboratory of FMIPA UNP. In this research, the measurements of wave length and light intensity are conducted toward firefly of Pteroptyx tener taken from Sungai Lareh , a district of Koto Tangah, Padang before and after being given treatment with heavy metal by using UV-Vis spectrophotometer. The Determined variables in this research is independent variables which consist of lead (Pb), copper (Cu), iron (Fe) and zinc (Zn) and heavy metal concentration is 0,5 mg/l, 1 mg/l and 2 mg/l, the dependent variables are relative intensity of firefly light and inhibition coefficient, and the control variable is type and size of firefly and solvent media used. The result of research indicates that bioluminescence relative intensity value of firefly keep declining if heavy metal concentration rises up. The decline of the biggest intensity is caused by the existence of lead (Pb), then zinc (Zn), copper (Cu), and the smallest is iron (Fe). Bioluminescence inhibition coefficient of firefly keeps declining because of the increasing of heavy metal concentration. For concentration of 0.5 mg/l , the coefficient inhibition of lead (Pb) is 1.8620M-1, zinc (Zn) is 0.6275M-1, copper (Cu) is 0.4260M-1, and the smallest is iron (Fe) which is 0.2481M-1. For concentration of 1 mg/l, the inhibition coefficient of lead (Pb) is 1.1494M-1, zinc (Zn) is 0.4269M-1, copper (Cu) is 0.3385M-1 and the smallest one is iron (Fe) which is 0.2747M-1. For concentration of 2 mg/l , the inhibition coefficient of lead (Pb) is 0.8951M-1, zinc (Zn) is 0.3269M-1, copper (Cu) is 0.2998M-1, and the smallest one is iron (Fe) which is 0.2671M-1. The biggest inhibition coefficient from bioluminescence of firefly is caused by the existence of lead (Pb), then zinc (Zn), copper (Cu), and the smallest one is iron (Fe). The biggest Inhibition coefficient value is followed by the large of heavy metal molecule weight, that is nitrate lead (PbNO3) that has the biggest molecule weight which is 269.20 g/mol, then nitrate zinc (ZnNO3) which is 127.38 g/mol, nitrate copper (CuNO3) which is 125.55 g/mol and nitrate iron (FeNO3) which is 117.86 g/mol. Keywords: Bioluminescence, Heavy Metal, Relative Intensity and Inhibition Coefficient

PENENTUAN JENIS MINERAL MAGNETIK GUANO DARI GUA SOLEK DAN GUA RANTAI KECAMATAN LAREH SAGO HALABAN KABUPATEN LIMA PULUH KOTA MENGGUNAKAN METODE ISOTHERMAL REMANENT MAGNETIZATION (IRM) Wilda Febi Rahmadhani
PILLAR OF PHYSICS Vol 2 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Based on magnetic susceptibility value from guano of Solek and Rantai Caves, known that guano contain magnetic mineral. Unless the kinds of guano magnetic mineral from both caves didn’t know. Because of that, in this research determined the kinds of guano magnetic mineral, especially the kinds of magnetic mineral from Titanium-Iron Oxide. The method that used to determines magnetic mineral of Titanium-Iron Oxide is Isothermal Remanent Magnetization (IRM) method that detected uses IRM saturation curve and S-Ratio. The sample that detected by IRM saturation curve are guano from Solek and Rantai caves, while the sample that detected by using S-Ratio is guano from Solek cave. Based on IRM saturation curve, known the kinds of magnetic mineral that contain on guano from Solek and Rantai caves are magnetite, and the result of analysis uses S-Ratio is known the kinds of contained mineral magnetic on guano from Solek cave is also magnetite. So, can be indicated that the kind of contained magnetic mineral on guano from Solek and Rantai caves is magnetite. Keywords: Guano, the kinds of magnetic mineral, Isothermal Remanent Magnetization (IRM), Saturation Curve, S-Ratio

Perbandingan Karakteristik Fisis Kopi Luwak (Civet coffee) dan Kopi Biasa Jenis Arabika Megah Aysah Fuferti.Z
PILLAR OF PHYSICS Vol 2 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Coffee is one of the most popular beverages in the world is consumed by many people. The purpose of this study was to determine how the physical comparisons civet coffee and regular coffee arabika type. Research carried out by varying the mass density of coffee and container volume, the results obtained from the density value of civet coffee is bigger than the usual coffee, civet coffee density value on the container volume 319.32 is 0.02264 whereas regular coffee is 0.01927, the container volume 509.43 density of civet coffee is 0.02265 whereas regular coffee is 0.01989, the container volume 739.41 density of civet coffee is 0.02292 whereas regular coffee is 0.01999. The results of the specific heat shows that the specific heat value of civet coffee is bigger than the usual coffee, civet coffee specific heat value of 14.28 Kal / ° C, while the value of specific heat of regular coffee 10,08 Kal / ° C. Thermal conductivity value of civet coffee is less than the value of regular coffee conductivity, thermal conductivity value of civet coffee is 0.41x10-4 Kal / cm s ° C while the thermal conductivity value of regular coffee 2.74x10-4 Kal / cm s ° C. Water content of the research results obtained civet coffee is 2.5%, while 3.5% of regular coffee so known that the water content of civet coffee is less than the value of the water content of regular coffee arabica types. Keywords: common Type Arabika Coffee, Civet coffee, Density, Thermal Conductivity, Heat type and water content

Identifikasi Kandungan Mineral Magnetik Guano di Gua Solek dan Gua Rantai Menggunakan Metode Scanning Electron Microscope (SEM) Wardina Nasution
PILLAR OF PHYSICS Vol 2 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

The guano’s Cave Solek and Cave Rantai has a large magnetic susceptibility values. The value of magnetic susceptibility shows large concentrations of magnetic minerals contained in the cave. Based on the magnetic susceptibility values can be specified types of magnetic minerals. Determination type of magnetic minerals have done before by using the method of rock magnetization IRM and XRD methods, however, to see the surface morphology and elemental composition of magnetic minerals have not been done. The research to make identification surface morphology and composition of guano magnetic minerals in Cave Solek and Cave Rantai use Scanning Electron Microscope (SEM). The writer hope this research can confirm of true result in this measuring with other methods of rock magnetism. This research used SEM instrument combine with EDS type Philips CM 12 pw 6030. There are 7 samples used in this research devided by 4 samples from Solek Cave and 3 samples from Rantai Cave. Guano samples take based variation of the magnetic susceptibility that has been known previously. The observation of measuring about surface morphology of guano samples Cave Solek and Cave Rantai use SEM image magnification can not be analyzed because it that is too small. Therefore used by EDS analysis showed that the chemical elements forming magnetic minerals. The result of EDS identification show of magnetic mineral content Solek Cave and Cave Rantai dominated by a mineral that consists of the element iron (Fe) and oxygen (O) which is a magnetic mineral-forming elements of the group that is titanium magnetite of iron oxide (Fe3O4), hematite (Fe2O3) and ilmenite (FeTiO3), in addition it be found as well mineral nonmagnetic an element of such as the andalusite (Al2SiO5), siderite (FeCO3) and quartz (SiO2). Keywords: Guano, Consentration of Magnetic Mineral, Surface Morphology, Elemental Composition of Magnetic Mineral SEM and EDS.

PENGUKURAN MEDAN MAGNETIK BATUAN MENGGUNAKAN SENSOR FLUXGATE Airin Ahad Dini
PILLAR OF PHYSICS Vol 2 (2013)
Publisher : Department of Physics – Universitas Negeri Padang UNP

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.

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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

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