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INDONESIAN JOURNAL OF APPLIED PHYSICS

ijap
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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 267 Documents

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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

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

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.

Pengaruh Berat Beban pada Lengan terhadap Gaya Otot Bisep Sebagai Media Pembelajaran IPA Konsep Bioekanika Hanif Alifah Kurniawati; Heru Kuswanto; Febyarni Kimianti; Wahyu Pamungkas
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 9, No 01 (2019): April
Publisher : Department of Physics, Sebelas Maret University

Manusia melakukan banyak kegiatan yang menggunakan konsep biomekanika. Biomekanika adalah ilmu yang menjelaskan tentang aspek mekanika dari gerakan tubuh manusia. Ilmu yang menggunakan hukum fisika dan mekanika untuk mendeskripsikan gerakan pada tubuh dan memahami efek gaya dan momen yang terjadi. Gerak tubuh manusia yang memakai prinsip biomekanika salah satunya adalah kegiatan pada lengan di mana terdapat gaya otot bisep ketika seseorang mengangkat benda atau beban. Penelitian ini bertujuan untuk mengetahui pengaruh berat beban pada lengan terhadap gaya otot bisep pada seseorang ketika mengangkat sebuah benda bermassa. Penelitian ini termasuk penelitian eksperimen Pengukuran gaya otot bisep menggunakan sebuah alat kerangka tangan yang dibuat dari kayu dengan memberikan variasi beban yaitu 0,2 N; 0,4 N; 0,6N; 0,8 N and 1,0 N. Setiap beban yang diberikan di lengan, maka akan diketahui gaya otot bisep yang terukur dengan menggunakan neraca pegas. Data hasil penelitian dianalisis secara sederhana dan dimasukkan ke dalam grafik. Berdasarkan hasil analisis diketahui bahwa semakin besar berat beban yang diberikan pada lengan maka gaya otot bisep juga akan semakin besar.

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

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

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.

Effects of Surface Diffuseness and Coupling Radius Parameters on The Fusion and Quasi-Elastic Barrier Distributions Viska Inda Variani; Ida Usman; Muhammad Zamrun Firihu
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 9, No 01 (2019): April
Publisher : Department of Physics, Sebelas Maret University

We study the heavy-ion reaction at sub-barrier energies for 16O+144,154Smsystems using full order coupled-channels formalism. We especially investigate the effect of fusion and quasi- elastic barrier distributions on the surface diffuseness and the coupling radius parameters of the nuclear potential for these systems. We found that the structure of fusion and quasi-elastic barrier distributions is more sensitive to the surface diffuseness and coupling radius parameters for the reaction with spherical target, 16O+144Sm systemcompared to the reaction that involves the deformed target, i.e., 16O+154Sm system. In more detail, the results of coupled-channels calculations for the fusion and the quasi-elastic barrier distributions for deformed target are not sensitive to the choice of the coupling radius and surface diffuseness parameters. In mark contrast, the structure of the fusion and the quasi-elastic barrier distributions for spherical target are very sensitive to the coupling radius and surface diffuseness parameters. We found that the small surface diffuseness parameter smeared out the fusion barrier distributions and the larger coupling radius smoothed the high energy peak of the quasi-elastic barrier distributions. We also found that the larger coupling radius, , is required by the experimental quasi-elastic barrier distribution for the 16O+144Sm system whereas the experimental fusion barrier distribution compulsory the small value, i.e., .

Zone Landslide Analysis Using Geophysical Method and Analysis of Soil Type for Disaster Mitigation In Waru Pamekasan Sandy Vikki Ariyanto; Idon Joni
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 9, No 02 (2019): IJAP Volume 9 ISSUE 02 YEAR 2019
Publisher : Department of Physics, Sebelas Maret University

The results of this study are the factors of landslides there are many cracks in the ground, normal faults, shear faults and slope of the soil surface. The higher the slope of the land surface, the more potential for landslides. Results of XRF Waru 1 Si 58.3%, Waru 2 Ca 71.37%, Waru 3 Si 43.3%. The results of XRD Waru 1 and Waru 2 were 88% SiO2 compound, Waru 3 in the form of CaCo3 compound was 75.2%. SEM results with 10,000x enlargement Waru 1 is almost homogeneous in the form of slabs which identifies an uneven grain size and with a little porosity indicating the sample is partially amorphous in structure, Waru 2 shows an inhomogeneous sample with a fairly high porous dispersion and is not equally, Waru 3 shows the existence of an almost cube crystal form with high porosity so that it causes frequent landslides due to the density of a sand is still lacking so that it makes it easy for the land to be evicted because there are still many cavities in the soil.

Lucutan Plasma Pijar Korona dengan Variasi Tegangan untuk Degradasi Metilen Biru kusumandari kusumandari; Teguh Endah Saraswati; Nor Shalina Saputri
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 9, No 01 (2019) : IJAP Volume 9 ISSUE 01 YEAR 2019
Publisher : Department of Physics, Sebelas Maret University

Teknologi plasma merupakan metode pengolahan limbah yang cukup menjanjikan. Dalam penelitian ini, lucutan plasma dihasilkan dari dua buah elektroda jarum stainless steel yang dipasang paralel dan dihubungkan dengan tegangan tinggi bolak-balik (AC) sebesar 8.5 – 11.5 kV. Metilen biru digunakan sebagai larutan model. Elektroda berada sekitar 2 mm di atas larutan yang diletakkan pada magnetic stirrer dengan kecepatan 6 rpm. Waktu perlakuan yang digunakan adalah 2, 4, 6, 8, dan 10 menit untuk setiap tegangan. Karakteristik larutan meliputi absorbansi, pH dan suhu diukur sebelum dan sesudah perlakuan untuk mengetahui pengaruh tegangan dan lama waktu perlakuan plasma. Hasil yang didapat, absorbansi dan pH turun seiring kenaikan tegangan dan lama waktu perlakuan, sedangkan suhu akan semakin naik.

Pengaruh Trial Focal Depth terhadap Kedalaman Sumber Gempa Menggunakan Hypo71pc (Studi Kasus Kegempaan di Sulawesi Utara) A.M. Miftahul Huda; Nuruddin Kafy El-Ridlo
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 10, No 01 (2020): IJAP Volume 10 ISSUE 01 YEAR 2020
Publisher : Department of Physics, Sebelas Maret University

Pemodelan hiposenter kejadian gempa telah dilakukan di wilayah Sulawesi utara menggunakan perangkat HYPO71PC. Proses penentuan posisi hiposenter memperhatikan berbagai aspek referensi, salah satunya adalah penggunaan kedalaman fokal uji. Penelitian ini akan membahas pengaruh elemen tersebut dalam memberikan hasil iterasi. Data kegempaan berasal dari stasiun Badan Meteorologi Klimatologi dan Geofisika dari tahun 2008-2018 dengan ketentuan magnitudo lebih dari 6. Metode pengujian dilakukan secara random dengan memperhatikan data kedalaman terlapor. Hasil pengujian didapatkan pengaruh yang relatif besar terhadap data yang memberikan luaran dan kesesuaian dengan posisi kejadian gempa serta kedalamannya. Efek yang ditimbulkan oleh kedalaman fokal uji mempengaruhi proses iterasi secara kuantitas pemrosesan data. Berdasarkan nilai kesalahan root mean square dan keunikan luaran didapatkan 5 buah kejadian dengan kondisi terbaik.

Ionic Silver Nanoparticles (Ag+) Sebagai Bahan Antibiotik Alternatif Untuk Salmonella Typhymurium Saraswati Kendis Intan Palupi; Suparno Suparno
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 10, No 01 (2020): IJAP Volume 10 ISSUE 01 YEAR 2020
Publisher : Department of Physics, Sebelas Maret University

This study aims to determine the ability of ionic silver nanoparticles (ISN) Ag+ as an antibiotic material to inhibit the growth of Salmonella typhimurium. ISN are produced by electrolysis using two AgBr bars as electrodes with distilled water as electrolyte solvents. The effect of electrolysis time on ISN concentration and electrical conductivity was observed with a TDS and EC meter. All ISN samples have been characterized by UV-Vis spectrophotometer, AAS, and PSA. The results showed the concentration of ISN and the electrical conductivity of the solution increased with the length of time of electrolysis. UV-Vis spectrophotometer test results have shown the peak of absorbance at a wavelength of 416.5-417 nm. The concentration test using AAS has shown that the concentration of ISN for TDS 11 ppm, 20 ppm and 29 ppm is 9.8 ppm, 17.6 ppm, and 23.9 ppm respectively. While the size of silver nanoparticles PSA test results have shown (76.8 ± 0.667) nm. The results of the test of the ability of ISN as an antibiotic Salmonella typhimurium showed the formation of a clear zone until the 72th hour with the largest average diameter in the stationary phase area (hours 24-72) was 7.39 ± 0.04 mm for a concentration of 20 ppm.

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Contact Name
Risa Suryana

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rsuryana@uns.ac.id

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Journal Mail Official
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Location
Kota surakarta,

Jawa tengah

INDONESIA