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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 9 Documents
 1 
Search results for , issue "Vol 15, No 3 (2019)" : 9 Documents clear
Kinetika Reaksi Proses Pirolisis Pada Sekam Padi Casnan Casnan
Jurnal Fisika dan Aplikasinya Vol 15, No 3 (2019)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (797.948 KB) | DOI: 10.12962/j24604682.v15i3.4602

Abstract

Penelitian ini bertujuan untuk mengetahui kinetika reaksi pada proses pirolisis sekam padi dengan menganalisis karakteristik kurva Thermogravimetry Analysis (TGA). Karakteristik Kurva TGA menjelaskan proses kehilangan massa terhadap suhu pada proses pirolisis dengan berbagai tahapan perubahan fasa material akibat proses pemanasan. Proses pirolisis dipengruhi oleh suhu, waktu, dan laju pemanasan, sehingga dengan menganalisis faktor suhu, waktu dan laju pemanasan akan diperoleh kinetika reaksinya. Kinetika reaksi proses pirolisis berdasarkan persamaan Arhenius, kecepatan reaksi dekomposisi dipengaruhi oleh perubahan massa atau fraksi massa per satuan waktu. Nilai faktor eksponensial (A) akan berpengaruh terhadap kecepatan reaksi proses pirolisis, semakin besar nilai A maka kecepatan reaksinya semakin besar dan sebaliknya. Nilai A pada proses pirolisis sekam padi yang dicuci HCl dan dipanaskan, nilainya lebih kecil jika dibandingkan dengan nilai A proses pirolisis sekam padi tanpa pencucian dan dipanaskan.
Efek Pemanasan Pra-kompaksi Dan Sinter Terhadap Sifat Kuat Tekan Komposit Al/SiC Mashuri, M
Jurnal Fisika dan Aplikasinya Vol 15, No 3 (2019)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1104.292 KB) | DOI: 10.12962/j24604682.v15i3.5281

Abstract

Telah dilakukan penelitian  efek pemanasan pra kompaksi pada matrik  Al dan sintering terhadap densitas dan kuat tekan komposit Al/SiC yang dibuat dengan metode metalurgi serbuk. Pembuatan komposit Al/SiC diawali dengan memanaskan matrik Al pra-kompaksi pada temperatur  40°C, 60°C dan 80°C dalam waktu 1 jam, kompaksi secara mekanik dan disinter pada temperatur 400°C, 500°C,  dan 600°C. Guna meningkatkan kehomogenan tekanan saat kompaksi diseluruh bagian komposit digunakan zinc stearate yang tidak reaktif dan mudah menguap.  Identifikasi fasa dan morfologi dilakukan dengan menggunakan alat X-rays Difractometry (XRD) dan Scanning Electron Microscope (SEM). Densitas dan porositas diukur dengan metode Archimedes dan kuat tekan diuji dengan alat Torsee Universal Testing Machine.  Hasil penelitian menunjukkan pemanasan pra-kompaksi pada matrik Al hingga temperatur 60 oC dan temperatur sinter hingga 500 oC dapat meningkatkan nilai densitas dan kuat tekan komposit Al/SiC yang dibuat dengan metode metalurgi serbuk.  Pemanasan sinter dapat menimbulkan fasa baru Al2O3-γ pada bidang kontak permukaan Al – SiC yang dapat memperkuat ikatan antar muka dan mengurangi porositas sehingga densitas dan kuat tekan meningkat.
Uji Aktivitas Antibakteri dan Permeabilitas Membran Hibrid Nilon-TiO2 wenny maulina
Jurnal Fisika dan Aplikasinya Vol 15, No 3 (2019)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (677.557 KB) | DOI: 10.12962/j24604682.v15i3.4625

Abstract

Hybrid membranes from nylon and titanium dioxide (TiO2) were prepared using hydrogen chloride (HCl) as precursor and acetyl aceton as chelating agent in the casting solution by phase inversion methods. The aim of this study was investigated antibacterial effect and permeation flux due to the impact of TiO2 contents on the hybrid membranes. Among all the prepared membranes, nylon-TiO2 hybrid membranes with mass fraction 70wt%:30wt% exhibited the best antibacterial effect. Meanwhile, the additions of TiO2 were raised water and sodium chloride (NaCl) permeability from 0 to 40wt%.
Pencitraan Inframerah Dekat dari Lemak Sapi pada Model Lemak Tissue Chrisli Elfri Sahuleka
Jurnal Fisika dan Aplikasinya Vol 15, No 3 (2019)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1583.773 KB) | DOI: 10.12962/j24604682.v15i3.4584

Abstract

All women concern for their beauty. Some ways are done to obtain beauty with the use of creams, routine care in beauty clinics, up to plastic surgery by having liposuction on the desired part of the face. In the early procedures of plastic surgery, a 2-4cm incision is made on the skin before sucking the fat out. This cutting can cause various risks. Therefore, a non-destructive method is needed to identify the position of fat as a pre-plastic surgery procedure. Near Infrared Spectroscopy is a method for quickly and precisely identifying and measuring a sample without damaging it. This study aims to determine the area spectral and or wavelength sensitivity for fat and several other important components and to determine the position of fat from a one-dimensional image. The results show that the location of fat is in position 11-28. From this, it can be concluded that NIRS can inform the position of fat from a one-dimensional image.  
Analisa Kehandalan Ekstraksi Fitur Ordo Kedua terhadap Ordo Pertama untuk Identifikasi Ciri Berbasis Tekstur Warna Arief Bustomi
Jurnal Fisika dan Aplikasinya Vol 15, No 3 (2019)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v15i3.5311

Abstract

The feature extraction method is done by first converting RGB images into grayscale images. Based on the grayscale image, two different processing methods are carried out, namely first order feature extraction and second order feature extraction. The extraction features of the first order used 5 characteristic parameters, namely Mean, Variance, Skewness, Kurtosis, and Entropy, while the extraction features of the second order used 6 characteristic parameters, namely Angular Second Moment, Contrast, Correlation, Standard Deviation, Inverse Difference Moment and Homogenity. The 11 characteristic parameters will then be classified using the LVQ artificial neural network method to find the final weight used as the reference weight for characteristics identification based on color texture. In this research, 30 image samples were used (15 image samples in category A and 15 image samples in category B) which were divided into 16 image samples for training and 14 image samples for testing. The results of the research analysis show that the second order feature extraction method is more reliable than the first order feature extraction method.
Determinasi Kandungan pada Campuran Lemak Babi dengan Sapi menggunakan Spektroskopi Inframerah Dekat dan Partial Least Square Regression rizki esta agustin
Jurnal Fisika dan Aplikasinya Vol 15, No 3 (2019)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1349.92 KB) | DOI: 10.12962/j24604682.v15i3.4546

Abstract

Fat is one of important elements for human’s body. Therefore, fat is often added as one of main ingredients both in food industry activity and in cosmetic products. In this study, another technique was done to make an assumption about the content of fat by using Near Infrared Spectroscopy, NIRS and it was followed by Partial Least Square Regression, PLSR. This assumption was done by making 21 samples with the pork fat percentage toward the cow fat (w/w), which was 0,00, 0,05 until 1,00 with the interval of 0,05. This calibration model was developed using 11 samples of even concentrate and it was validated by using 10 samples of odd concentrate. The infra-red spectrum used in this study was around 4.000-10.000 cm-1. Prior data treatment covered smoothing, normalizing, the first, and the second derivative which were used to optimized the developed PLSR-NIRS prediction models. The second descending spectrum was used to increase the spectrum resolution before PLS analysis was done. Overall, the NIRS and PLSR techniques were sucessful in showing the percentage of the content in the mixted samples of pork and cow fat.
Sintesis Ca2P2O7 dari Limbah Kerang dengan Metode Solvotherma Faisal Akbar; Retno Kusumaningrum; Mi'raj Shabrin Jamil; Alfian Noviyanto; Wahyu Bambang Widayatno; Agus Sukarto Wismogroho; Nurul Taufiqu Rochman
Jurnal Fisika dan Aplikasinya Vol 15, No 3 (2019)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v15i3.4707

Abstract

Kalsium pirofospat telah berhasil disintesis dari limbah kerang menggunakan metoda solvothermal dan pemanasan. Limbah kerang yang digunakan adalah kerang hijau dan kerang darah sebagai bahan baku kalsium karbonat. Kalsium oksida didapatkan dengan cara mengkalsinasi kalsium karbonat pada temperatur 1000°C selama 2 jam dengan kondisi atmosfir biasa. Selanjutnya, CaO dicampur dengan H3PO4 pada proses solvothermal guna mendapatkan fasa CaHPO4. Kalsium pirofospat diperoleh dengan cara memanaskan serbuk CaHPO4 pada temperatur 800°C selama 2 jam dan kondisi atmosfir biasa. Hasil analisa fasa menunjukkan terbentuknya fasa tunggal kalsium pirofospat tanpa adanya fasa pengotor lainnya untuk limbah kerang darah. Hal yang berbeda untuk limbah kerang hijau, dimana pengotor ditemukan selain fasa kalsium pirofospat. Ukuran partikel rata-rata untuk kalsium pirofospat dari limbah kerang hijau adalah 1.5 ± 0.8 µm, sedangkan kalsium pirofospat dari limbah kerang darah adalah 258 ± 294 nm.
Interpretasi Batuan Bawah Permukaan Prospek Bijih Besi di Kawasan Desa Pagubugan dan Desa Pagubugan Kulon Kecamatan Binangun Kabupaten Cilacap Berdasarkan Survei Magnetik Muhammad Sehah
Jurnal Fisika dan Aplikasinya Vol 15, No 3 (2019)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v15i3.4611

Abstract

Geophysical exploration to determine the potential of iron sand in the Pagubugan Village and Pagubugan Kulon Village areas, District of Binangun, Regency of Cilacap has been carried out from May to August 2018 using the magnetic method. The acquisition of magnetic data has been done in the research area at the geographical position stretching from 109.2988° E to 109.31892° E and 7.68430° S to 7.70402° S. Morphologically, the research location is the part of the eastern coastal in the district of Binangun. The results of the modeling and interpretation of magnetic anomaly data that obtained indicate the presence of rock deposite which thought to contain iron ore which intersects with clay, silt, sand, gravel, and crust from the Alluvium formation with a magnetic susceptibility value of 0.0094 cgs units. This rock deposite is estimated to lie at a depth of 0 to 53 meters and stretches at the geographical position from 109.30981° E and 7.69264° S to 109.31787 °E and 7.69575° S.
Blood Pressure Monitor Design Using MPX5050GP Pressure Sensor and Visual C# 2010 Express Ayu Jati Puspitasari; Endarko Endarko; Iim Fatimah
Jurnal Fisika dan Aplikasinya Vol 15, No 3 (2019)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v15i3.4929

Abstract

Blood pressure monitor (BPM) using oscillometric method with MPX5050GP pressure sensor has been successfully fabricated and calibrated. Oscillometric method is measurement method to observe cuff pressure oscillations. In this study, the oscillometric waveform measured by fabricated BPM used Arduino Uno which processes pulse rate, systolic and diastolic pressures. Measurement results of pulse rate, systolic and diastolic pressures will be displayed and recorded in application designed using Visual C# 2010 Express. Fabricated BPM capable of measuring pulse rate and blood pressure in the range of 40-260 mmHg with ratio of systolic and diastolic pressures were achieved 0.48 and 0.78, respectively. The system has an average error of systolic pressure, diastolic pressure, and pulse rate were -4.38 mmHg (2.72%), 0.10 mmHg (5,55%), and 4.48 bpm (6.07%).

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