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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 423 Documents
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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
Jurnal Fisika dan Aplikasinya Vol 16, No 2 (2020)
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.
The synthesis of TiO2 nanoparticles by Milling and Coprecipitation Mixed Method Maya Puspitasari Izaak; Yohanes Edi Gunanto; Henni Sitompul; Wisnu Ari Adi
Jurnal Fisika dan Aplikasinya Vol 16, No 2 (2020)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v16i2.5199

Abstract

Ilmenite type Fe2O3 waste (which is processed from natural iron sand) was processed into TiO2 nanoparticles powder carried out by leaching with HCl and then using high-energy milling (HEM) for 50 hours. The characteristics of the powder such as particle size, size distribution and phases were analyzed using various techniques such as XRD, SEM, EDS and particle size analyzer. Synthesis and characterization of ilmenite type iron sand have been successfully made into TiO2 by milling and coprecipitation mixed method. The purity level of TiO2 was obtained by 85.01%. Particle size of TiO2 was approximately 500 nm.
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
Jurnal Fisika dan Aplikasinya Vol 16, No 2 (2020)
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.
Analisis Akurasi Sistem sensor DHT22 berbasis Arduino terhadap Thermohygrometer Standar fitri Puspasari; Trias Prima Satya; Unan Yusmaniar Oktiawati; Imam Fahrurrozi; Hristina Prisyanti
Jurnal Fisika dan Aplikasinya Vol 16, No 1 (2020)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v16i1.5776

Abstract

The research of temperature and humidity comparison test using DHT22 sensor instrument based on Arduino Uno by Thermohigrometer. The background of this research problem is the development of increasingly advanced technology to facilitate measurement of temperature and humidity using DHT22 sensor based on Arduino. The aims of this tesearch was to knowing the sensor performance and comparing measurement result between DHT 22 sensor and standard thermohygrometer. The experiment was done using 5 times repeatability method at each room temperature variation. Comparison of the results of the average error value in the measurement of temperature and humidity between the DHT22 sensor with a standard Thermohygrometer obtained a value of 2.99% for humidity and -2.31% for temperature.
Pengaruh Sudut Lubang pada Sonic Crystal terhadap Atenuasi dengan Bahan Pipa PVC prajitno, Gontjang; Indriyani, Catharina Risti; Suyatno, Suyatno
Jurnal Fisika dan Aplikasinya Vol 16, No 1 (2020)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v16i1.6211

Abstract

Pada penelitian sonic crystal ini yang digunakan adalah pipa PVC berukuran 1,055 meter dengan diameter pipa 1,5’’ dan jari-jari di setiap lubang yaitu 6 mm dengan filling rasio square 0,5. Sehingga didapatkan bahwa pada sudut 30˚ merupakan sudut dengan atenuasi optimal, dimana rata-rata atenuasinya sebesar -10,66 dB. Sedangkan atenuasi rata-rata pada sudut 0˚ sebesar -4,04 dB, pada sudut 90˚ sebesar -6,7 dB, pada sudut 150˚ sebesar -4,004 dB dan pada sudut 180˚ sebesar -4,36 dB. Selain itu, jumlah lubang pada penelitian ini tidak berpengaruh pada frekuensi resonansinya. Jumlah lubang hanya berpengaruh pada penurunan SPL, semakin banyak lubang pada pipa maka akan semakin besar penurunan SPLnya. Serta pada saat panel menggunakan 3 layer akan mengalami atenuasi yang optimal yaitu sebesar -4,87 dB, sedangkan pada saat 1 layer memiliki atenuasi rata-rata sebesar -3,02 dB serta 2 layer sebesar -4,29 dB. Semakin banyak layer yang digunakan maka akan semakin besar pula atenuasi.
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
Jurnal Fisika dan Aplikasinya Vol 16, No 2 (2020)
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
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
Jurnal Fisika dan Aplikasinya Vol 16, No 2 (2020)
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 105 Gy m2 h-1 A-1 with an average value 9.522 x 105 Gy 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 105 Gy m2 h-1 A-1 with an average value 4.648 x 105 Gy 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
Effect of HAp on Characterization of MgZn-xHAp Biocomposites Henni Sitompul; Yohanes Edi Gunanto; Maya Puspitasari Izaak
Jurnal Fisika dan Aplikasinya Vol 17, No 1 (2021)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v17i1.7411

Abstract

Research on Mg as biodegradable materials in orthopedics has been carry out intensively in the 17 years. Various studies conducted to produce material that is superior in mechanical properties and corrosion resistance. One of the developments carry out is to make Mg-based composite. This study aims to see the effect of HAp on Mg6ZnHAp composites. The biocomposites were synthesized by mixing the HAp powder on the Mg6Zn powder mixture with the composition of 5%, 7% and 9% using ball milling for 30 minutes. The material is sintered at 350 oC and held for one hour. Biocomposites were characterized by SEM/EDS, X-ray diffraction (XRD) and Potentiostat. The SEM/EDS results showed that the larger the HAp composition resulted in the smaller grain size. The crystallite size of the material decreases with increasing HAp composition in the material. The presence of HAp in the material also affects the corrosion rate. The greater HAp composition in the material will result in better corrosion resistance. 
Perbandingan Pengaruh Redaman Gilbert dan Ketebalan Bahan Terhadap Perubahan Dinamika Magnetisasi pada Nanodot Pt/MnSb dan CoFeAl Ivana Helga Iriani; Andreas Setiawan; Nur Aji Wibowo
Jurnal Fisika dan Aplikasinya Vol 16, No 3 (2020)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v16i3.5460

Abstract

Penelitian ini menyajikan perbandingan pengaruh redaman Gilbert dan ketebalan nanodot terhadap dinamika magnetisasi dari Pt/MnSb dan CoFeAl dengan menyelesaikan persamaan Landau-Lifshift Gilbert menggunakan Simulator Mikromagnetik. Parameter magnetik yang digunakan dalam penelitian ini mewakili karakteristik Pt/MnSb dan CoFeAl dengan variasi redaman Gilbert 0,4 – 0,9. Kedua bahan dimodelkan dalam bentuk balok dengan ukuran permukaan 50×50 nm2 dan dengan variasi ketebalan 5 – 100 nm. Skema simulasi yang digunakan adalah Reduced Barrier Writing dimana sampel berada pada suhu ruang 298 K sembari diinduksi dengan medan magnetik eksternal yang besarnya meningkat dari 0 hingga 2 Tesla selama 2,5 ns. Hasil penelitian menunjukkan bahwa Pt/MnSb dan CoFeAl memiliki kestabilan termal yang baik untuk berbagai nilai redaman Gilbert dan variasi ketebalan yang dipakai (>60 kBT). Peningkatan redaman Gilbert memperbesar nilai medan nukleasi kedua bahan. Medan nukleasi meningkat pada ketebalan 5 – 35 nm namun menurun pada ketebalan 40 – 100 nm. Penguatan redaman Gilbert menyebabkan perbesaran nilai medan koersif bahan CoFeAl dan penurunan untuk bahan Pt/MnSb. Sementara itu, mempertebal bahan menyebabkan peningkatan medan koersif pada ketebalan 5 – 35 nm dan penurunan pada ketebalan 40 – 100 nm. Laju magnetisasi kedua jenis bahan semakin cepat seiring menguatnya nilai redaman Gilbert dan melambat seiring meningkatnya ketebalan.
Sintesis dan Sifat Penyerapan Gelombang Mikro Grafena Alam (reduced graphene oxide) Berbahan Dasar Arang Bambu Kuning (Bambusa Vulgaris), Ori (Bambusa Bambos Miq) dan Petung (Dendrocalamus Asper) M Mashuri; Luthfiati Ningsih; M. Zainul Asrori; T Triwikantoro; D Darminto
Jurnal Fisika dan Aplikasinya Vol 16, No 3 (2020)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v16i3.6973

Abstract

Telah dilakukan sintesis serbuk grafena alam berfasa reduced graphene oxide (rGO) dari  arang bambu Kuning (Bambusa Vulgaris), Ori (Bambusa Bambos Miq) dan Petung (Dendrocalamus Asper) sebagai bahan penyerap gelombang mikro dengan metode karbonisasi. Serbuk grafena alam berfasa rGO  dikarakterisasi dengan x-ray diffraction (XRD), berupa lembaran tipis berskala mikro dengan tebal ~0,17 µm yang dikarakterisasi dengan scanning electron microscopy (SEM) dan memiliki konduktivitas listrik ~5,5.10-6 S/cm. Grafena alam berfasa rGO memiliki densitas rendah, dielectric loss yang kuat dan specific surface area yang tinggi memiliki potensi menyerap gelombang mikro dengan baik. Penyerapan gelombang mikro pada frekuensi 8 – 12 GHz diukur menggunakan alat vector network analyzer (VNA). Hasil pengukuran menunjukkan nilai maximum reflection loss (RLm) dan matching frequency (fm) serbuk grafena alam berfasa rGO dari arang bambu Kuning, Ori dan Petung secara berturut-turut RLm = -34,15 dB, -45,46 dB dan -52,88 dB dengan fm = 8,40 GHz, 8,40 GHz dan 8,56 GHz pada ketebalan 0,6 mm. Secara literatur penyerapan gelombang mikro dari grafena alam berfasa rGO dari arang bambu Petung lebih baik dibanding dari bahan komersial dan sangat potensial untuk dikembangkan menjadi bahan penyerap gelombang mikro hybrid yang ramah lingkungan. 

Page 33 of 43 | Total Record : 423

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