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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 15 Documents
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Search results for , issue "Vol 7 (2016)" : 15 Documents clear
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (576.673 KB) | DOI: 10.24036/2054171074

Abstract

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
Identifikasi jenis dan ukuran bulir mineral magnetik pada lindi tempat pembuangan akhir (TPA) sampah Air Dingin Kota Padang menggunakan metode X-Ray Diffraction (XRD) Robi Marcian
PILLAR OF PHYSICS Vol 7 (2016)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (747.943 KB) | DOI: 10.24036/2045171074

Abstract

A cities or urban areas having large population growth should be supported by the provision of advice and good infrastructure such as a waste management. Padang municipal waste management is done by the method of removal of garbage from disposal temporary to the final disposal that generate wastewater that leachate emanating from the garbage. Leachate is a liquid yellow, brown or black, and result from the decomposition process due to ingress of water, whether it is rain water or ground water, into a pile of garbage. If not managed properly, the surface of the water used by residents around the landfill is likely contaminated by pollutants called leachate (liquid waste / leachate). Mngetahui This study aims to determine the type and size of magnetic mineral grains in landfill leachate Air Dingin of Padang using X-Ray Difraction (XRD) Characteristing  magnetic minerals is done using X-Ray Difraction (XRD) aims to determine the type of magnetic minerals and the size of the grains in the leachate. This study uses nine samples taken from 5 points leachate ponds, 2 points on the river, and 2 points of the gutter landfill Air Dingin of Padang. Samples of leachate pond, river, ditch and first extracted by using methanol bath soap that aims to separate the magnetic and non-magnetic minerals. Type of magnetic minerals can be determined by analyzing the peaks of the intensity of the XRD measurement results using Bragg law, while the grain size can be determined using the equation Scherrer. After analysing, the results showed that each sample contains the same type of mineral is magnetite (Fe3O4) which derived from the source - that is Anthopogenic. Magnetic mineral grain size of samples gutter Final Disposal (TPA) Air Dingin of Padang classified multi-domain (MD). Magnetite has the largest size is 193.25 μm with an average grain size of 63.90 lm
Pengaruh penambahan senyawa ekstrak kulit jeruk (Citrus sp.) terhadap sifat fisika plastik biodegradable dari ubi kayu dengan senyawa aditif gula jagung Dona Intan Rezki
PILLAR OF PHYSICS Vol 7 (2016)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (479.672 KB) | DOI: 10.24036/2050171074

Abstract

The materials used today to package food and drink one of which is plastic. Over time, the plastic needs increasing in many areas of life. On the other hand, the use of plastics as packaging materials face many environmental problems, which can not be decomposed by microbes in the soil. This resulted in the accumulation of plastic waste that cause air pollution, environmental damage and also have a negative effect on human life. Because of these problems, need to be overcome to make plastics that are environmentally friendly and do not cause pollution, the biodegradable plastic. Biodegradable plastics in this study with the addition of orange peel extract compounds of 0%, 10%, 15%, and 20%. Tests were performed to obtain the value of the mechanical properties and degradation of plastics biodegrdable cassava with variation of orange peel extract compounds are as follows: increased tensile strength values for the addition of orange extract compounds from 10% -15 and decreases in increments of 20%, as well as the flexural strength . While the ability of degradation increases with increasing amount of orange peel extract compounds
Cover, Dewan Redaksi, Daftar Isi Pendahuluan Jurnal
PILLAR OF PHYSICS Vol 7 (2016)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (436.383 KB) | DOI: 10.24036/2482171074

Abstract

Cover, Dewan Redaksi, Daftar Isi
Analisis jenis batuan menggunakan metoda geolistrik tahanan jenis konfigurasi wenner di Bukit Apit Puhun Kecamatan Guguk Panjang Kota Bukittinggi (Analysis of rock types using the geoelectric resistivity method of the Wenner configuration at Apit Puhun Hill, Guguk Panjang District, Bukittinggi City) Mia Azhari
PILLAR OF PHYSICS Vol 7 (2016)
Publisher : Department of Physics – Universitas Negeri Padang UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (789.609 KB) | DOI: 10.24036/2041171074

Abstract

Bukit apit puhun located in West Sumatera traversed by active segment of sumatera named Sianok Segment. This condition cause Bukit Apit Puhun prone to earthquake. Erathquake caused the layer  composition of earth changed. Based on this condition,  rock structure research in Bukit Apit Puhun must be done. The research is basic research descriptively. Exploration was collected by resistivity Geoelectrical method wenner configuration.  Wenner configuration had a good vertical resolution and suitable for mapping rocks structure. The interpretation of the data was used Smoothness-Constraint Least Squares inversion 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 Bukit Apit Puhun were Clay, Sandstone, Limestone, Andesite, and Granite. Total distribution area of rocks that build Bukit Apit Puhun in five track that is Clay consists of 6.452,48 m2, Sandstone 16.988,28 m2, Limestone 40.661,39 m2, Andesite 8.951,72 m2, and Granite 7.919,08 m2. Based on this calculation, was found that Bukit Apit Puhun dominated by Limestone

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