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INDONESIA
INDONESIAN JOURNAL OF APPLIED PHYSICS
Published by Universitas Sebelas Maret
ISSN : 20890133     EISSN : 24776416     DOI : -
Core Subject : Science,
Astronomy Energy Materials Science & Nanotechnology Physics
Indonesia Journal of Apllied Physics provides rapid publication of short reports and important research in all fields of physics. Indonesia Journal of Apllied Physics publishes articles that are of significance in their respective fields whilst also contributing to the disclipline of physics as a whole. Articles should be submitted to the Editorial Office of Indonesia Journal of Apllied Physics through this site. Further information on submission is also available at this site
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Articles 5 Documents
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Search results for , issue "Vol 9, No 02 (2019): October" : 5 Documents clear
Efek Penggunaan Cairan Ionik sebagai Aditif terhadap Konduktivitas Ionik Elektrolit Baterai Ion Litium Atut Reni Septiana; Evvy Kartini; Wagiyo Honggowiranto; Sudaryanto Sudaryanto; Rahmat Hidayat
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 9, No 02 (2019): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (434.136 KB) | DOI: 10.13057/ijap.v9i02.31700

Abstract

Teknologi baterai litium ion merupakan alternatif penyuplai energi pada peralatan portabel, divais elektronik, dan aplikasi tenaga tinggi seperti kendaraan listrik dan penyimpanan daya untuk energi terbarukan. Pada baterai litium ion, elektrolit memainkan peranan penting pada performa baterai. Elektrolit baterai litium ion, pada umumnya terdiri dari garam litium yang dilarutkan dalam pelarut organik dan aditif. Namun, LiPF6 tidak stabil secara termal dan mempengaruhi performa baterai secara signifikan. Selain itu, pelarut standar (konvensional) juga memiliki beberapa kekurangan jika diaplikasikan pada kendaraan listrik. Terkait dengan masalah tersebut, penggunaan elektrolit jenis lainnya, yakni garam litium, seperti lithium bis (trifluoromethylsulfonyl) imide (LiTFSI) yang dapat dikombinasikan dengan cairan ionik menjadi sangat penting untuk dikaji. Oleh karena itu, dalam penelitian ini telah dikaji karakteristik konduktivitas ionik elektrolit berbasis LiTFSI. Pengukuran konduktivitas ionik elektrolit (LiTFSI) dalam pelarut karbonat dengan dan tanpa cairan ionik BMIMTFSI sebagai aditif telah dilakukan. Konduktivitas ionik elektrolit LiTFSI dalam pelarut karbonat dengan tambahan cairan ionik lebih tinggi dibandingkan LiTFSI tanpa tambahan cairan ionik, masing-masing yaitu 3.1 mS/cm and 2.7 mS/cm.
Portable Electronic Nose for Discrimination of Indonesian Robusta Coffee Aroma with Varied Roasting Temperature Correlated with Gas Chromatography Mass Spectrometry Yesiana Arimurti; Kuwat Triyana; Sri Anggrahini
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 9, No 02 (2019): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (696.94 KB) | DOI: 10.13057/ijap.v9i02.18622

Abstract

The quality of coffee is strongly affected by its aroma, so that instrument for aroma testing is necessary especially for quality control. In this research, coffee aroma was tested using electronic nose and then correlated to gas chromatography-mass spectrometry (GC-MS). The green beans of robusta coffee (coffee canephora var.robusta) originated from Sumatra was used as a testing sample. The roasting temperature was varied to be 180 °C, 195 °C, and 210 °C, while the roasting time was set to be constant at 20 minutes. After the roasting process, the coffee beans were grounded using a coffee grinder. The feature of the response signal for each gas sensors of the electronic nose to ground coffee aroma, was extracted using two methods; i.e. gradient multiplied by signal peak and average value. The principle component analysis (PCA) was applied to discriminate the aroma of ground coffee with varied roasting temperature. The scoreplot of PCA analysis shows a clear discrimination of each coffee aroma, produced by different roasting temperature. From the GCMS analysis, it is clearly confirmed that more aromatic compounds detected when the roasting temperature increase. It is correlated with the discrimination result using electronic nose. The loading plot interpretation provides information that TGS822 and TGS826 are the most affecting sensors for discrimination of coffee aroma with varied roasting temperature. In the future, the electronic nose is potentially applied in coffee industry for quality control during process.
Pembangkitan Terahertz pada Metamaterial Chiral Menggunakan Spektroskopi Emisi Terahertz Juliasih Partini; Restu Widiatmono
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 9, No 02 (2019): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (743.868 KB) | DOI: 10.13057/ijap.v9i2.32438

Abstract

Metamaterial adalah material buatan dengan indeks bias negatif dan secara simultan memiliki permitivitas elektrik dan permeabilitas magnetik bernilai negatif. Pengembangan metamaterial mengalami terobosan dengan munculnya struktur metamaterial baru yang disebut sebagai metamaterial struktur chiral sebagai sumber radiasi terahertz (THz). Pengukuran sinyal emisi THz dilakukan menggunakan sistem spektroskopi emisi terahertz dengan sistem laser Ti:Sapphire femtosekon sebagai sumber radiasi. Sampel metamaterial chiral dengan ukuran panjang 1,2 mm, lebar 0,3 mm dan kedalaman 0,3 mm susunan 300 struktur dengan arah putar kanan dan putar kiri. Kedua sampel mampu membangkitkan emisi gelombang THz dalam jangkau frekuensi 0 - 2,24 THz. Proses rektifikasi optik diperlihatkan oleh adanya pembangkitan gelombang THz pada sampel metamaterial chiral oleh laser femtosekon. Hasil eksperimen memperoleh hubungan kuadratik antara energi laser pemompa dengan amplitudo gelombang THz. Hal ini dapat disimpulkan bahwa metamaterial chiral persegi dengan kedalaman berbeda telah berhasil membangkitkan emisi gelombang THz yang terpolarisasi eliptik.
Vibration Vulnerability Identification in Kota Lama Semarang using Microtremor Method Dwi Purwantoro Sasongko; Gatot Yuliyanto; Zaenal Arifin
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 9, No 02 (2019): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1191.536 KB) | DOI: 10.13057/ijap.v9i02.34592

Abstract

Kota Lama is one of the landmarks in Semarang Central Java that is located on young alluvial sediment. This area is prone to vibrations stemming from tectonic activities around Semarang. Therefore, measurements were carried out to identify this vibration vulnerability using the microtremor method. These were aimed at obtaining a spatial distribution of vibration vulnerability. There were 29 measurement points each separated by a sampling interval of 50 ms and a duration of 10 minutes.  Ground vibration amplification in this area was found to range from 0.74 to 4.9 with the highest being on the outskirts of Kota Lama. The predominant frequency was found to range from 0.02 to 1.1 Hz. These patterns of high predominant frequency and ground vibration amplification suggest that the central area of Kota Lama needs more attention. High ground shear strain that ranges from 0.02 to 0.86 means that possible event to occur in Kota Lama include landslide, soil compaction, and liquefaction, as is also evident with existing dynamic properties of repeated collapse effect and loading speed effect. Meanwhile, structure of vibration amplification against predominant frequency underneath Kota Lama revealed lateral subsurface discontinuity on its southwest side. It was also found that the contour of ground vibration amplification resembles the shape of Vifjhoek fort.
Efficient Use of Satellite Gravity Anomalies for mapping the Great Sumatran Fault in Aceh Province Muhammad Yanis; Marwan Marwan; Nazli Ismail
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 9, No 02 (2019): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (805.861 KB) | DOI: 10.13057/ijap.v9i2.34479

Abstract

Gravity Satellite has been widely used in tectonic studies and regional of geological mapping. The Satellite Gravity data are provided free by Scripps Institution of Oceanography, University of California San Diego. The data are acquired by GEOSAT and ERS-1 satellites with a 1.5 km resolution for one pixel. For a further application, the tilt derivative analytic technique was used in order to enhance linear trends of the geological structure revealed by the Bouguer anomalies. The method is represented by the value of an angle between the total horizontal and vertical derivative from the gravity data. The results show that the tilt derivative calculation has been able to map clearly some geological structures on the north of Sumatra i.e., the Aceh and the Seulimeuem segments, as well as some local faults around them. On the other hand, Banda Aceh as the capital city of Aceh Province and Pidie District is dominated by positive values of the tilt derivative anomalies. The data coincide with geological maps of both areas where they are covered by alluvial deposits. Based on the result, it can be concluded that the tilt derivative method is potentially used for quick interpretation of the satellite gravity data.

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