INDONESIAN JOURNAL OF APPLIED 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
Articles
239 Documents
<![CDATA[A Comparison between Drilling and Standard Penetration Test (SPT) Data to the Electrical Resistivity Sounding with Schlumberger Configuration in UNS Area ]]>
<![CDATA[Listanti, Sinta Nur Rizqi]]>;
<![CDATA[Darsono, Darsono]]>;
<![CDATA[Purwana, Yusep Muslih]]>
<![CDATA[ INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 8, No 2 (2018): October ]]>
Publisher : <![CDATA[Department of Physics, Sebelas Maret University ]]>
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DOI: 10.13057/ijap.v8i2.17962
<![CDATA[The geophysics test using electrical resistivity method has been conducted in the area of UNS Campus to indicate the lithological of subsurface. This method is categorized as a Non-Destructive Test (NDT) due to the data acquisition is done at the ground level and no destruction during the test, which is more advantageous than destructive method such as drilling and SPT test. This study was performed with Schlumberger configuration in three location by electrical resistivity sounding. The acquisition data uses Resistivity meter OYO 2119 McOHM-EL with the track length is 100 m, while the data processing use IPI2Win to get a logarithmic graph between distance and resistivity and Origin to obtain graphic of resistivity and SPT. The result of this study indicates that electrical resistivity has a good correlation with SPT data. The electrical resistivity graph shows a linear increase along with increment of the depth, which is similar to the SPT graph. The slope difference at the first location is 2.44±1,197, the second location is 2.028±0.822, and the third location is 0.622±0.735.]]>
<![CDATA[Crystal Structures and Magnetic Properties of Polyethylene Glycol (PEG-4000) Encapsulated Co0.5Ni0.5Fe2O4 Magnetic Nanoparticles ]]>
<![CDATA[Suharyadi, Edi]]>;
<![CDATA[Griyanika, Lintang]]>;
<![CDATA[Utomo, Joko]]>;
<![CDATA[Agustina, Ayu Kurnia]]>;
<![CDATA[Kato, Takeshi]]>;
<![CDATA[Iwata, Satoshi]]>
<![CDATA[ INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 8, No 2 (2018): October ]]>
Publisher : <![CDATA[Department of Physics, Sebelas Maret University ]]>
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DOI: 10.13057/ijap.v8i2.22108
<![CDATA[Nanocrystalline mixed spinel ferrite of Co0.5Ni0.5Fe2O4 magnetic nanoparticles (MNPs) has been successfully synthesized by coprecipitation method and encapsulated by PEG-4000 with various concentrations. X-Ray Diffraction (XRD) patterns showed that nanoparticles contained Co0.5Ni0.5Fe2O4 spinel ferrite with crystallite size of 14.9 nm. After PEG-4000 encapsulation particles size decreased became 7.7 nm. Interaction Co0.5Ni0.5Fe2O4 nanoparticles with long chain PEG-4000 caused the crystal growth trap. Lattice parameter and X-Ray density have no significant difference after encapsulated PEG-4000. The coercivity (??) of Co0.5Ni0.5Fe2O4 was 214 Oe. The ?? decreased after PEG-4000 encapsulation became 127 Oe, which is due to the decrease of crystallite size. The maximum magnetization (Mmax) of Co0.5Ni0.5Fe2O4 was 12.0 emu/g, and decreased after PEG-4000 encapsulation to 11.7 emu/g, because PEG-4000 is paramagnetic. After the concentration of PEG-4000 increased, then the amount of paramagnetic material increase which lead maximum magnetization decrease.]]>
<![CDATA[Interpretasi Struktur Bawah Permukaan Jalur Sesar Opak Berdasarkan Model Suseptibilitas dan Second Vertical Derivative dengan Metode Geomagnet ]]>
<![CDATA[Dayana, Desi Novi]]>;
<![CDATA[Wibowo, Nugroho Budi]]>;
<![CDATA[Darmawan, Denny]]>
<![CDATA[ INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 8, No 2 (2018): October ]]>
Publisher : <![CDATA[Department of Physics, Sebelas Maret University ]]>
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DOI: 10.13057/ijap.v8i2.21428
<![CDATA[Tujuan dari penelitian ini adalah untuk mengetahui struktur bawah permukaan jalur Sesar Opak berdasarkan model suseptibilitas dan SVD dengan metode geomagnet. Pengambilan data dilakukan menggunakan Proton Precession Magnetometer Geometric tipe G-856 dengan 77 titik pengukuran dan jarak antar titik pengukuran +2 km. Pengolahan data dilakukan melalui koreksi variasi harian, koreksi IGRF, SVD, dan reduksi ke kutub. Pemodelan dilakukan dengan menganalisis anomali medan magnet yang telah direduksi ke kutub. Hasil pemodelan solid model menunjukkan bahwa Formasi Semilir dengan nilai suseptibilitas (0 – 100) ×10-3, Formasi Merapi Muda dengan nilai suseptibilitas (0 – 2) ×10-3, dan Formasi Nglanggran dengan nilai suseptibilitas (0,6 – 70) ×10-3. Hasil pemodelan SVD dan solid model menunjukkan keberadaan Sesar Opak.]]>
<![CDATA[Numerical Analysis of Fusion Cross Section of (_^16)O+(_^16)O by Using The Modified Glas-Mosel Formula ]]>
<![CDATA[Yulianto, Yacobus]]>;
<![CDATA[Su'ud, Zaki]]>
<![CDATA[ INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 8, No 2 (2018): October ]]>
Publisher : <![CDATA[Department of Physics, Sebelas Maret University ]]>
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DOI: 10.13057/ijap.v8i2.21820
<![CDATA[One of the interesting topics in nuclear reactions is a study about reaction cross section between the interacting nuclei. For calculating fusion cross section, the Glas-Mosel formula has been proven successfully in explaining the experimental results of fusion cross section. In this study, the fusion cross sections of O16+O16 reaction were calculated by using modified Glas-Mosel formula. The energies were set at 10≤?≤40 MeV. The potential of interacting nuclei was approached by using Woods-Saxon potential. In numerical process, the differential equations were solved by using finite different method and optimization process was performed by using Nelder-Mead method. Good agreement between the experimental and this study results has been achieved successfully. Referring those results above, it can be indicated that the modified Glas-Mosel formula has good capability to explain the experimental results of fusion reaction of light nuclei. It can be a useful tool in explaining the experimental results or in predicting fusion cross section of light nuclei.]]>
<![CDATA[Pengaruh Suhu Annealing terhadap Struktur Mikro dan Sifat Optik Lapisan Bismuth Ferrite (BiFeO3) ]]>
<![CDATA[Iriani, Yofentina]]>;
<![CDATA[Megasari, Novinda Hary]]>;
<![CDATA[Nurosyid, Fahru]]>
<![CDATA[ INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 9, No 01 (2019): April ]]>
Publisher : <![CDATA[Department of Physics, Sebelas Maret University ]]>
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DOI: 10.13057/ijap.v9i01.33262
<![CDATA[Penelitian ini bertujuan untuk mengetahui pengaruh suhu annealing terhadap struktur mikro dan sifat optik lapisan Bismuth Ferrite (BiFeO3). Lapisan BiFeO3 telah berhasil berhasil terdeposisi di atas substrat quartz menggunakan metode Chemical Solution Deposition (CSD). Struktur mikro dikarakterisasi menggunakan XRD dan sifat optik dikarakterisasi menggunakan spektrofotometer UV-Vis. Variasi suhu annealing yang dilakukan yaitu 550oC, 600oC, dan 650oC. Suhu annealing mempengaruhi struktur mikro yaitu ukuran kristal, tingkat kekristalan, parameter kisi serta mempengaruhi sifat optik yaitu absorbansi dan energi gap lapisan BiFeO3. Semakin tinggi suhu annealing maka ukuran kristal, tingkat kekristalan, dan parameter kisi meningkat. Puncak absorbansi mengalami penurunan seiring dengan bertambahnya suhu annealing. Suhu annealing mempengaruhi energi gap lapisan BiFeO3. Energi gap paling rendah yaitu pada suhu annealing 650ºC sebesar (2,45 ± 0,02) eV.]]>
<![CDATA[Portable Electronic Nose for Discrimination of Indonesian Robusta Coffee Aroma with Varied Roasting Temperature Correlated with Gas Chromatography Mass Spectrometry ]]>
<![CDATA[Arimurti, Yesiana]]>;
<![CDATA[Triyana, Kuwat]]>;
<![CDATA[Anggrahini, Sri]]>
<![CDATA[ INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 9, No 02 (2019): October ]]>
Publisher : <![CDATA[Department of Physics, Sebelas Maret University ]]>
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DOI: 10.13057/ijap.v9i02.18622
<![CDATA[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.]]>
<![CDATA[Pembangkitan Terahertz pada Metamaterial Chiral Menggunakan Spektroskopi Emisi Terahertz ]]>
<![CDATA[Partini, Juliasih]]>;
<![CDATA[Widiatmono, Restu]]>
<![CDATA[ INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 9, No 02 (2019): October ]]>
Publisher : <![CDATA[Department of Physics, Sebelas Maret University ]]>
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DOI: 10.13057/ijap.v9i2.32438
<![CDATA[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.]]>
<![CDATA[Pengaruh Berat Beban pada Lengan terhadap Gaya Otot Bisep Sebagai Media Pembelajaran IPA Konsep Bioekanika ]]>
<![CDATA[Kurniawati, Hanif Alifah]]>;
<![CDATA[Kuswanto, Heru]]>;
<![CDATA[Kimianti, Febyarni]]>;
<![CDATA[Pamungkas, Wahyu]]>
<![CDATA[ INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 9, No 01 (2019): April ]]>
Publisher : <![CDATA[Department of Physics, Sebelas Maret University ]]>
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DOI: 10.13057/ijap.v9i01.25544
<![CDATA[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.]]>
<![CDATA[Vibration Vulnerability Identification in Kota Lama Semarang using Microtremor Method ]]>
<![CDATA[Sasongko, Dwi Purwantoro]]>;
<![CDATA[Yuliyanto, Gatot]]>;
<![CDATA[Arifin, Zaenal]]>
<![CDATA[ INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 9, No 02 (2019): October ]]>
Publisher : <![CDATA[Department of Physics, Sebelas Maret University ]]>
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DOI: 10.13057/ijap.v9i02.34592
<![CDATA[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.]]>
