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JFA (Jurnal Fisika dan Aplikasinya)
Published by Institut Teknologi Sepuluh Nopember Surabaya
ISSN : 1858036X     EISSN : 24604682     DOI : -
Core Subject : Science,
Physics
JFA (Jurnal Fisika dan Aplikasinya, Abbreviation: J.Fis. dan Apl.) hanya menerbitkan artikel penelitian asli serta mengulas artikel tentang topik seputar bidang fisika (fisika teori, material, optik, instrumentasi, geofisika) dan aplikasinya. Naskah yang dikirimkan ke JFA belum pernah diterbitkan ditempat lain serta tidak dalam proses pertimbangan untuk diterbitkan ditempat lain, dalam bahasa apapun. Studi teoritis, eksperimental, dan praktis sama-sama didorong, seperti juga artikel interdisipliner dan yang timbul dari penelitian dan kolaborasi industri.
Arjuna Subject : -
Articles 604 Documents
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The effect of doping of La3+ ions on multiferoic Bi2-xLaxFe4O9 (x = 0; 0.2; 0.5; 1.0) as microwave absorber: Yohanes Edi Gunanto, Wisnu Ari Adi Yohanes Edi Gunanto Yohanes Edi Gunanto; Wisnu Ari Adi Wisnu Ari Adi
Jurnal Fisika dan Aplikasinya Vol 16 No 2 (2020): June 2020 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v16i2.5739

Abstract

The synthesis and characterization of Bi2-xLaxFe4O9 multiferoic material (x = 0; 0,2; 0,5; 1) have been used as microwave absorbers. Bi2-xLaxFe4O9 (x = 0; 0,2; 0.5; 1) material was made by solid state reaction with mechanical milling technique using high energy milling (HEM). X-ray diffraction (XRD) was used for characterization of formation phase and crystal structure, scanning electron microscopy-energy dispersive spectra (SEM-EDS) was used to characterize surface morphology and particle size, whereas vector network analysis (VNA) was used for characterization of absorption capability microwaves. The characterization results showed that all samples were in phase with orthorombic crystal structure, P bam space group. The average particle size was 578.5 nm with an almost homogeneous form. Meanwhile, the best sample in absorbing microwaves was obtained for x = 0.2 with reflection loss value (RL) around -21dB at 11.2 GHz frequency.
Physical Properties Comparison of rGO-like phase prepared from Coconut Shell and the Commercial Product: Retno Asih, Maya Mahirotul Septya, Erik Bhekti Yutomo, Fahmi Astuti, Malik Anjelh Baqiya, Darminto Darminto Retno Asih Retno Asih; Maya Mahirotul Septya Maya Mahirotul Septya; Erik Bhekti Yutomo Erik Bhekti Yutomo; Fahmi Astuti Fahmi Astuti; Malik Anjelh Baqiya Malik Anjelh Baqiya; Darminto Darminto
Jurnal Fisika dan Aplikasinya Vol 16 No 2 (2020): June 2020 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v16i2.6712

Abstract

Physical properties of reduced graphene oxide (rGO) prepared from two different raw materials, namely coconut shell (rGO-s) and graphite mineral (rGO-c, produced by Graphenea Inc.), have been investigated. While both samples have the same density of about 1.9 g/cm3, rGO-c has more porous of about 1.3 cc/g with diameter of 10.8 nm compared to rGO-s which has 0.2 cc/g porous with diameter of 2.4 nm. Specific surface area in rGO-c was also obtained much larger than that of rGO-s. rGO-c and rGO-s have specific surface area of ~298 m2/g and ~475 m2/g, respectively. Examinations on particle size and surface morphology show that rGO-c has homogenous particles which consist of transparent thin sheets, while rGO-s has rather heterogenous particles that look like dens stacked sheets. The presence of C and O was confirmed at the observed morphology. The difference in physical features were then found to influence the obtained electrical conductivity of the samples. rGO-c has higher conductivity than rGO-s. Estimation on gap energy (Eg) indicates that rGO-c and rGO-s have Eg in the range of semiconducting materials. The study provides a better understanding on physical properties of coconut shell-derived rGO to further revise synthesis method to improve quality of the obtained rGO.
Preliminary Study of Using KY-038 Sensor Based on Arduino UNO and LabView to Determine the Pulse Rate: Nur Afifah Zen, Slamet Indriyanto, Indah Permatasari, Juwansyah Sasmita, Lia Yuliantini Nur Afifah Zen Nur Afifah Zen; Slamet Indriyanto Slamet Indriyanto; Indah Permatasari Indah Permatasari; Juwansyah Sasmita Juwansyah Sasmita; Lia Yuliantini Lia Yuliantini
Jurnal Fisika dan Aplikasinya Vol 16 No 2 (2020): June 2020 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v16i2.6092

Abstract

The KY-038 sensor module is designed using Arduino UNO and LabView to allow human pulses. The experiment was carried out by making a design consisting of the KY-038 sensor module, Arduino UNO and LabView on a computer. LabView software is used to display pulse wave patterns. Measurement of the pulse will involve human objects with variations 3 namely relax (sit), sit and after running in place. The experimental results show that the different activities affect the voltage released on a chart that has a rating of 3 - 3.5 V. The more activities that are carried out before retrieving the pulse data, the greater the voltage that is read on the LabView results graph. After running in place, the value of the voltage and pulse are 3.5 V and 97 beats per minute, respectively.
Study of the Formation of Amorphous Carbon and rGO-like Phases from Palmyra Sugar by Variation of Calcination Temperature: Fahmi Astuti, Novita Sari, Vera Laviara Maghfirohtuzzoimah, Retno Asih, Malik Anjelh Baqiya, Darminto Darminto Fahmi Astuti Fahmi Astuti; Novita Sari Novita Sari; Vera Laviara Maghfirohtuzzoimah Vera Laviara Maghfirohtuzzoimah; Retno Asih Retno Asih; Malik Anjelh Baqiya Malik Anjelh Baqiya; Darminto Darminto
Jurnal Fisika dan Aplikasinya Vol 16 No 2 (2020): June 2020 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v16i2.6706

Abstract

We have processed biomass from palmyra sugar to produce allotrope carbon by heating process with the variation of calcination temperature. The formation of amorphous carbon (a-C) was confirmed from the XRD result heated at 400°C with the observation of the peak at the position of ~24o. By increasing the temperature at 700°C, the presence of two peaks at 24o and 43o were observed, indicating the formation of rGO-like phase. The functional groups detected by FTIR spectra consist of C=C, C-O, C=O, C-H and O-H. The result of conductivity measurement exhibits that the material can be classified as semiconducting materials.
Evaluation of Well-Type Chamber Calibration Factor for Measurement of Ir-192 Brachytherapy Source Over 10 Institutions: Assef Firnando Firmansyah, Okky Agassy Firmansyah, Sri Inang Sunaryati, Nurman Rajagukguk Assef Firnando Firmansyah Assef Firnando Firmansyah; Okky Agassy Firmansyah Okky Agassy Firmansyah; Sri Inang Sunaryati Sri Inang Sunaryati; Nurman Rajagukguk Nurman Rajagukguk
Jurnal Fisika dan Aplikasinya Vol 16 No 2 (2020): June 2020 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v16i2.6406

Abstract

This paper describes about the evaluation of well-type chamber calibration factor for measurement Ir-192 brachytherapy source. Data were collected at ten institutions that have modalities of Ir-192 brachytherapy. The well-type chamber measures the Ir-192 brachytherapy sources in terms of air kerma strength. Calibration was carried out using the substitution method which adopted from a protocol published by the International Atomic Energy Agency. The well-type chamber standard used was HDR-1000 Plus. The results obtained that NAKS for well-type chamber from PTW manufacturers have a range of values from 9.063 x 105 – 9.875 x 105Gy m2 h-1 A-1 with an average value 9.522 x 105Gy m2 h-1 A-1, while the well-type chamber from Standard Imaging manufacturers have a range of values from 4.634 x 105 – 4.662 x 105Gy m2 h-1 A-1 with an average value 4.648 x 105Gy m2 h-1 A-1. The range of deviations obtained between NAKS new and NAKS old ranges from 0.8% to -1.8%, while the range of normalization results of NAKS new to the average value of NAKS new ranges from 0.952 - 1.029. There was one calibration factor that has a deviation of more than 1% over the NAKS old. Based on the calculation of uncertainty, all the calibration factor results obtained were still within the accepted range.
Analysis of Small Scale Topography and Local Precipitation in Bangka Belitung Island: Ratih Prasetya, Rizki Adzani Ratih Prasetya Ratih Prasetya; Rizki Adzani Rizki Adzani
Jurnal Fisika dan Aplikasinya Vol 16 No 2 (2020): June 2020 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v16i2.6301

Abstract

Weather early warning forecast has been developed using various method and data to investigate small scale weather characteristic. Each region, especially in low latitude has unique and dynamic local weather circulation. Bangka Belitung Island has a typical topography consists of hilly region and directly adjacent to the sea. Thus, this expected to have a high impact in local weather circulation. The used of in-situ data (air temperature, rainfall amount also wind surface speed and direction), weather satellite observation and meteorological model is chosen to investigates the local weather circulation characteristic. Findings in this study is that topography, has influencing and controlling local circulation such as the presence of land breeze and sea breeze supporting the formation of convective clouds around the hills in Bangka Belitung Island. Wind surface analysis shows that strong sea breeze activity occurred during the MAM period. Himawari satellite imagery analysis showed that rain occurred in the afternoon and only occurred in the mainland region of Bangka Belitung.
Analisis Resolusi Spasial Citra Ultrasonografi (USG) pada Arah Tangensial Radias Citra menggunakan Phantom Berbasis Silicon Rubber: Victory Immanuel Ratar, Surya Suryasatriya Trihandaru, Giner Maslebu Victory Immanuel Ratar Victory Immanuel Ratar; Surya Suryasatriya Trihandaru Surya Suryasatriya Trihandaru; Giner Maslebu Giner Maslebu
Jurnal Fisika dan Aplikasinya Vol 16 No 1 (2020): January 2020 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v16i1.4287

Abstract

Ultrasound is widely used in diagnostic imaging, therefore quality control(QC) of ultrasound images is important. One of the QC parameter is spatial resolution that can be analyzed by calculating the distance between two nearby object in the tangential direction of radiation. The image that is produced by the Curved Array transducer will produce a circular shaped image and the coordinates of the object isn’t in the cartesian coordinate system because it adapts to the surface of the transducer. The image must be transformed with a circle equation approach to calculate the distance between two nearby object. This study was using a Mindray 3D ultrasound model: DP-10 with Transducer model: 35C50EB, and phantom instruments made from a mixture of 99 ml silicon rubber and 1 ml catalyst. The acquisition data used a fixed frequency of 4.5 MHz with a gain variation of 168 dB, 182 dB, 202 dB and a depth variation of 3.3 cm, 4.9 cm, 5.7 cm. The result found that the measurement of objects in A area had an error of 0.8963%(0.087 mm),B area was 1.2979%(0.0779 mm), and C area was 2.6296%( 0.1183 mm). The values obtained still meet the standards set by American Association of Physicist in Medicine(AAPM).
Inspeksi Material menggunakan Mikro-Radiografi Sinar-X Digital melalui Pengukuran Densitas: Prasetyo Listiaji, Gede Bayu Suparta Prasetyo Listiaji Prasetyo Listiaji; Gede Bayu Suparta Gede Bayu Suparta
Jurnal Fisika dan Aplikasinya Vol 16 No 1 (2020): January 2020 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v16i1.4817

Abstract

X-ray digital radiography is a non-destructive digital imaging technique that utilizes X-ray radiation that penetrates material objects. This technique can be used to analyze the internal structure and composition of objects properly. Research has been carried out on material inspection using X-ray digital micro-radiography that has been developed in the Physics Department, FMIPA UGM. Material samples inspected were 2B and HB pencils. All samples were irradiated by X-rays with a tube voltage of 30 kV and a filament current of 20 mA. Several images were taken for each sample, then averaged and calculated the grayscale value (intensity). Density was calculated based on variations in the intensity difference that passes through the pencil. The radiographic image showed that the internal structure of the pencil object, were wood and graphite can be distinguished. The measurement results were obtained for HB pencils, the value of the graphite density of HB pencils was (2,52 ± 0,02) g/cm3 and graphite density of 2B pencils was (1,84 ± 0,02) g/cm3. The results of density different between HB graphite and 2B graphite indicate that X-ray radiography techniques can be an alternative for material inspection purposes and density measurement.
Analisis Silika (SiO2) Hasil Kopresipitasi Berbasis Bahan Alam menggunakan Uji XRF dan XRD: Linda Silvia, Mochamad Zainuri Linda Silvia Linda Silvia; Mochamad Zainuri Mochamad Zainuri
Jurnal Fisika dan Aplikasinya Vol 16 No 1 (2020): January 2020 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v16i1.5322

Abstract

Synthesis process of silica (SiO2) from Bancar sand has been carried out by coprecipitation method using NaOH. This study tried to obtain high purity silica from the natural resources by analyzing it using the Rietveld method. Experiments are conducted with different training. Study of X-ray Fluorescence (XRF) analysis showed that Bancar sand was used containing a silica composition weight of 81.7%. X-ray Diffraction (XRD) pattern proves that the synthesized SiO2 formed is amorphous silica, but is still a crystal structure, so that amorphous silica has not yet been formed as a whole. SiO2 content obtained showed high purity using the Rietveld method proved by GoF < 4%. By using MAUD software was obtained silica from coprecipitation methods have particle size were 98.4 ± 57.7 nm.
Perbandingan Citra Hasil Rekonstruksi Metode Newton-Raphson dan Landweber pada Electrical Capacitance Tomography: Analisis Resolusi dan Akurasi: Rifang Pri Asmara, Agung Tjahjo Nugroho, Endhah Purwandari Rifang Pri Asmara Rifang Pri Asmara; Agung Tjahjo Nugroho Agung Tjahjo Nugroho; Endhah Purwandari Endhah Purwandari
Jurnal Fisika dan Aplikasinya Vol 16 No 1 (2020): January 2020 Edition
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v16i1.5238

Abstract

Penelitian untuk membuat desain Electrical Capacitance Tomography dilakukan menggunakan metode numerik Finite Difference Method (FDM) untuk forward problem dan ditentukan tingkat akurasinya terhadap metode analitik. Solusi berbasis FDM yang diperoleh, digunakan dalam proses rekonstruksi menggunakan metode Landweber dan Newton-Raphson. Perbandingan citra hasil rekonstruksi dari kedua metode dianalisis berdasarkan resolusi dan akurasi citra yang dihasilkan. Hasil penelitian ini menunjukkan bahwa akurasi Finite Difference Method dengan melakukan pemotongan garis pada objek domain, didapatkan 90,57% pada garis horizontal dan 87,43% pada garis vertikal. Adapun hasil untuk rekonstruksi didapatkan akurasi proses rekonstruksi 98% untuk Newton-Raphson dan 88% untuk Landweber. Resolusi citra yang direkonstruksi dengan menggunakan Newton-Raphson mampu membedakan 2 benda dengan jarak pisah minimal 3 cm, sedangkan Landweber mampu membedakan 2 benda dengan jarak pisah minimal 8 cm.

Page 53 of 61 | Total Record : 604

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