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INDONESIA
INDONESIAN JOURNAL OF APPLIED PHYSICS
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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Prediksi Kejadian Fibrilasi Atrium Paroksismal Menggunakan Jaringan Syaraf Tiruan dan Particle Swarm Optimization dengan Fitur Interval RR Fahmi Alhafid; Nuryani Nuryani; Darmanto Darmanto
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 10, No 01 (2020): April
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (296.841 KB) | DOI: 10.13057/ijap.v10i01.39746

Abstract

Fibrilasi Atrium (FA) merupakan jenis aritmia yang paling umum dengan peningkatan resiko 1,5 hingga 2 kali lipat dari semua penyebab kematian dan peningkatan morbiditas. FA Paroksismal (FAP) adalah salah satu tipe fibrilasi atrium. Studi mengenai FAP menunjukkan bahwa 20% - 30% individu dengan FA memiliki FAP. Penelitian untuk membuat model predictor tool FAP menggunakan Jaringan Syaraf Tiruan (JST) telah dilakukan. Fitur Statistik interval RR dijadikan fitur masukan pada JST Radial Basis Function (RBF) dengan optimasi menggunakan Particle Swarm Optimization (PSO). Data Elektrokardiogram (EKG) yang digunakan adalah Atrial Fibrillation Prediction Database (AFPDB) dari PyhsioNet. Dengan target keluaran JST berupa PAF dan normal. Parameter RBF yang dioptimasi dengan PSO meliputi pusat, lebar dan bobot. Hasil fitur tunggal diperoleh bahwa sistem JST PSO-RBF lebih baik jika dibandingkan dengan JST RBF dalam membuat model predictor tool FAP. Dengan variasi fitur statisitik diperoleh sistem prediksi FAP dengan akurasi, sensitivitas dan spesifitas secara berturut-turut bernilai 85,82%, 84,15% dan 87,78%.
Support Vector Method with Radial Basis Function and Multi-Segment of Electrocardiogram for Paroxysmal Atrial Fibrillation Recognition Nuryani Nuryani
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 10, No 2 (2020): IJAP Volume 10 ISSUE 02 YEAR 2020
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v10i2.46263

Abstract

Paroxysmal Atrial fibrillation (PAF) is a heart problem relating to irregular and rapid beating of the heart atria. It has risk of stroke and is independently associated with risk of mortality. Early information of PAF episode is important for a patient to have appropriate treatment to reduce atrial fibrillation complications. This article presents a new strategy to detect PAF with base of statistical electrocardiographic features and a support vector machine (SVM). R-peak series of electrocardiogram were segmented and were extracted to find the statistics of RR intervals. Different approaches in relation with the segmentation were investigated. Two-class SVM with radial basis function (RBF) and the statistics of RR intervals were examined for PAF detection. Using clinical data of patients with PAF, the proposed strategy showed excellent performance of 99.17% in terms of accuracy. The experimental result indicated that the appropriate statistics of RR intervals and SVM-RBF with its suitable parameters can perform well for PAF detection.
Performance of Fuzzy Inference System for Calorific Value Predicting by Using The Mamdani Method Viska Inda Variani
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 11, No 1 (2021): IJAP Volume 11 ISSUE 01 YEAR 2021
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v11i1.44122

Abstract

It is well known that the energy content of fuel is characterized by its calorific value which is usually measured by using a bomb calorimeter. In many analysis, the calorific value is usually related with the proximate analysis results. In this study, the calorific value predicting program based on the proximate analysis data using the fuzzy inference system with Mamdani method has been developed. In our analysis, the proximate analysis data of moisture and volatile matter contents are used as input and the calorific value as output. The results showed that the influence of the moisture content is more dominant in determining the calorific value of fuel than volatile matter content. The performance of the calorific value predicting program also shown that the prediction error is about 0.75% to 5.2%. The obtained calorific value is well reproduced the experimental data.
Analisis Pengaruh Intrusi Air Laut terhadap Keberadaan Air Tanah di Desa Nusapati, Kabupaten Mempawah Menggunakan Metode Geolistrik Resistivitas Muhardi Muhardi; Faurizal Faurizal; Widodo Widodo
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 10, No 2 (2020): IJAP Volume 10 ISSUE 02 YEAR 2020
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Desa Nusapati merupakan daerah pesisir di Kecamatan Sungai Pinyuh, Kabupaten Mempawah, Provinsi Kalimantan Barat. Tujuan penelitian ini adalah untuk menganalisis pengaruh intrusi air laut terhadap keberadaan air tanah di Desa Nusapati. Metode yang digunakan adalah metode geolistrik resistivitas dengan konfigurasi Wenner-Schlumberger. Penelitian ini mengaplikasikan dua lintasan, yaitu pertama berarah Barat Daya-Timur Laut dan kedua berarah Tenggara-Barat Laut, dengan panjang lintasan masing-masing 260 meter. Hasil penelitian menunjukkan bahwa lapisan akuifer dangkal pada lintasan pertama mempunyai nilai resistivitas 0,15 Ωm hingga 1,30 Ωm berada pada kedalaman 4 meter hingga 30 meter. Sedangkan pada lintasan kedua mempunyai nilai resistivitas 0,19 Ωm hingga 1,88 Ωm berada pada kedalaman 2 meter hingga 26,4 meter. Hasil penelitian juga menunjukkan bahwa litologi lapisan akuifer di daerah penelitian diinterpretasi berupa pasir, pasir lempungan, dan pasir kerikil. Lapisan ini mengandung air tanah yang telah terdampak oleh intrusi air laut. Pengaruh intrusi ini menyebabkan keberadaan air tanah mempunyai salinitas dengan porsentase yang relatif rendah sehingga air tanah pada lokasi penelitian terasa payau.
Kajian Geofisika dan Geokimia Mangan di Desa Oetalus Kabupaten TTU Regina Seran; Eduardus Edi
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 11, No 1 (2021): IJAP Volume 11 ISSUE 01 YEAR 2021
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v11i1.46447

Abstract

Bijih mangan merupakan bahan galian yang banyak terdapat di kabupaten TTU. Proses penambangan mangan di desa Oetalus-TTU hingga saat ini masih dilakukan secara tradisional oleh masyarakat tanpa mengetahui pola penyebaran bijih mangan. Harga jual mangan pun tergolong rendah karena tidak ada informasi kepada masyarakat mengenai kualitas mangan yang ada di TTU. Oleh karena itu, penelitian ini dilakukan untuk identifikasi penyebaran mangan di lokasi penelitian desa Oetalus secara geolistrik dan melakukan karakterisasi secara geokimia untuk mengetahui karakteristik mineral mangan. Metode yang digunakan untuk identifikasi penyebaran mangan adalah metode geolistrik tahanan jenis konfigurasi schlumberger. Metode ini dilakukan dengan cara menginduksikan arus listrik ke bumi melalui 2 buah elektroda arus, kemudian diukur beda potensial maka akan diperoleh harga tahanan jenis semu berdasarkan susunan elektroda. Nilai tahanan jenis semu yang terukur dipengaruhi oleh adanya perbedaan nilai tahanan jenis setiap lapisan batuan bawah permukaan. Alat yang digunakan untuk pengambilan data geolistrik adalah 1 set resistivitymeter OYO MCOHM-EL model 2119. Metode karakterisasi secara geokimia menggunakan XRF untuk mengetahui komposisi unsur dan XRD untuk mengetahui jenis mineral mangan. Berdasarkan hasil penelitian diperoleh kisaran nilai tahanan jenis mangan di Oetalus yaitu 9-30 Ωm dengan kedalaman lapisan diduga antara 1-20 meter. Analisis menggunakan XRF diperoleh komposisi unsur mangan sebesar 94,2 %. Kadar mangan di oetalus ini sangat potensial dan ekonomis untuk ditambang, karena kadar rata-rata ekonomis bijih mangan adalah 45%. Analisis menggunakan XRD diperoleh jenis mineral mangan di Oetalus adalah pyrolusite (MnO2).
Hubungan Sifat Optik terhadap Performa Kinerja Sel Surya DSSC Transparan Berbahan Dye DN-F01 sebagai Sensitizer Agus Supriyanto; Ari Handono Ramelan; Mohd Khairul Bin Ahmad; Febrina Ramadhani; Diani Galih Saputri
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 10, No 2 (2020): IJAP Volume 10 ISSUE 02 YEAR 2020
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v10i2.46261

Abstract

Dye sensitized solar cell (DSSC) is the third generation of solar cells that currently developing by researchers to get the best performance. The selection of dye as a component of DSSC has a big influence in the light absorption process. In this study, DN-F01 organic dye was used as a sensitizer with various concentrations. The optical properties test was carried out on the DN-F01 dye solution by UV-Vis spectrophotometer (Shimadzu UV-1800) and the DSSC fabricated performance was tested by portable solar simulator (ORIEL Sol1A). From the results, the DN-F01 absorbance has ability to absorb light in the 300-500 nm wavelength range. The greatest efficiency value in this research is 2.44% obtained from the sample was immersed with the largest concentration of dye DN-F01 which has the smallest band gap energy of 2.38 eV.
Vertical to Horizontal Spectral Ratio (VHSR) Response of Seismic Wave Propagation in a Homogeneous Elastic – Poroelastic Medium Using The Spectral Finite Element Method Sudarmaji Saroji; Budi Eka Nurcahya; Nivan Ramadhan Sugiantoro
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 11, No 1 (2021): April
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v11i1.45969

Abstract

Numerical modeling of 2D seismic wave propagation using spectral finite element method to estimate the response of seismic waves passing through the poroelastic medium from a hydrocarbon reservoir has been carried out. A hybrid simple model of the elastic - poroelastic - elastic with a mesoscopic scale element size of about 50cm was created. Seismic waves which was in the form of the ricker function are generated on the first elastic medium, propagated into the poroelastic medium and then transmitted to the second elastic medium. Pororoelastic medium is bearing hydrocarbon fluid in the form of gas, oil or water. Vertical and horizontal component of velocity seismograms are recorded on all mediums. Seismograms which are recorded in the poroelastic and second elastic medium show the existence of slow P compressional waves following fast P compressional waves that do not appear on the seismogram of the first elastic medium. The slow P wave is generated when the fast P wave enters the interface of the elastic - poroelastic boundary, propagated in the poroelastic medium and is transmited to the second elastic medium. The curves of Vertical to horizontal spectrum ratio (VHSR) which are observed from seismograms recorded in the poroelastic and the second elastic medium show that the peak of VHSR values at low frequency correlated with the fluid of poroelastic reservoir. The highest VHSR value at the low frequency which is recorded on the seismogram is above the 2.5 Hz frequency for reservoirs containing gas and oil in the second elastic medium, while for the medium containing water is the highest VHSR value is below the 2.5 Hz frequency.
Konfigurasi Cekungan Barito Kalimantan Selatan Berdasarkan Analisis Data Gayaberat Eddy Mirnanda
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 10, No 2 (2020): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v10i2.27076

Abstract

Cekungan Barito agak lonjong dengan poros utama berarah Timurlaut - Baratdaya. Penampang cekungan tidak simetris, sayap bagian timur terjal sedang sayap barat relatip datar. Tepat di bagian poros utama cekungan dengan nilai anomali sekitar -25 mGal, batuan dasar Granit sebagai batuan dasar berumur pra-Tersier mencapai kedalaman kurang lebih 11 km di bawah permukaan. Di bagian cekungan ini, diisi batuan sedimen Tersier Tua setebal 5 km dan sedimen Tersier Muda diatasnya setebal 6 km. Ke arah timur sedimen Tersier Muda makin menipis dan diakhiri oleh kemunculan sedimen Tersier Tua akibat seretan intrusi batuan beku. Ke arah barat, nilai anomali gayaberat Bouguer naik secara perlahan mencapai +40 mGal, kemungkinan batuan dasar Granit makin mendekati permukaan sekitar 6 sampai 7 km, diatasnya ditindih oleh sedimen Tersier Tua dengan tebal 5 km yang tertutup oleh sedimen Tersier Muda setebal 1 sampai 2 km.Berdasarkan analisis model rapat massa bawah permukaan diperoleh bahwa sedimen berumur Tersier dan pra-Tersier dengan rapatmassa masing-masing 2,20 gr/cm3 dan 2,40 gr/cm3 merupakan lapisan paling atas, kemudian disusul oleh batuan dengan rapatmassa 2,68 gr/cm3 sebagai cerminan batuan dasar Granitik dan 3,10 gr/cm3 mewakili Mantel Atas. Selain itu batuan Ultrabasa yang tersingkap di bagian pegunungan Meratus yang memiliki rapatmassa 2,90 gr/cm3 yang menumpang di atas batuan Granitik dan diterobos oleh batuan intrusi Granit dengan rapatmassa 2,72 gr/cm3.
Analisis Proses Ekstraksi pada Nano Kafein Terhadap Konsentrasi Kafein Terbuang pada Molecularly Imprinted Polymer (MIP) dan Rongga Tercipta Jumatul Rahmayani; Maimuna Maimuna; Jorena Bangun; Idha Royani
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 11, No 1 (2021): April
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Molecularly Imprinted Polymer (MIP) nano kafein telah disintesis menggunakan metode cooling-heating dengan melibatkan kafein sebagai analit, Methacrylic Acid (MAA) sebagai monomer fungsional, Benzoil Peroksida (BPO) sebagai inisiator reaksi, Ethylene Glycol Dimethacrylac (EDMA) sebagai pengikat silang dan kloroform sebagai pelarut. Nano kafein diperoleh dengan mengubah kafein ke dalam skala nanopartikel menggunakan alat High Energy Milling (HEM) jenis Shaker Mill-miller 1st selama 10 menit. Ukuran partikel berdasarkan karakterisasi menggunakan XRD adalah sebesar 19,029 nm. Kemudian polimer nano kafein digerus dan dilakukan pencucian berulang untuk membuang kafein dari polimer. Berdasarkan hasil FTIR, terjadi penurunan konsentrasi pada gugus penciri kafein yakni N-H, C-N, dan C=O yang dapat dilihat berdasarkan kenaikan persen transmitansi akibat proses pencucian pada MIP nano kafein. Untuk mengetahui jumlah dan ukuran rongga sebagai tempat yang ditinggalkan kafein maka MIP di karakterisasi menggunakan SEM dan dianalisis menggunakan software porediz dengan bantuan Matlab. Hasilnya menunjukkan bahwa jumlah dan ukuran rongga yang terbentuk pada MIP nano kafein sebanyak 233 rongga pada ukuran rongga di bawah 100 nm. Artinya penggunaan analit dalam skala nano dapat memberikan peluang tercipta rongga yang lebih banyak. Jumlah dan ukuran rongga yang tercipta ini akan meningkatkan selektivitas MIP dalam aplikasinya.
Two Dimensional Modeling of Basaltic Rocks Intrusion Based on The Local Magnetic Anomalies Data in Jatilawang District Banyumas Regency Sehah Sehah; Sukmaji Anom Raharjo; Urip Nurwijayanto Prabowo
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 10, No 2 (2020): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v10i2.41885

Abstract

Two dimensional modeling to basaltic rocks intrusion in Pekuncen and Karanglewas Villages Jatilawang District, Banyumas Regency, Central Java based on the local magnetic anomalies data has been carried out in March – June 2020. The amount of magnetic data obtained from the acquisition in the field was 239 data stretching in position of 109.107222° – 109.134944°E and 7.561361° – 7.577306°S, with the local magnetic anomalies values ranging of -2,961.11 – 1,516.31 nT. To model anomalous sources in the subsurface in two dimensions, then the local magnetic anomalies data is transformed into pseudogravity anomalies data, so that anomalous value can be obtained as -27.815 – 41.087 mGal. Based on the pseudogravity anomalous map, the basaltic rock intrusion is interpreted to be located in the eastern part of the research area, so modeling of anomalous sources is conducted in this area. The results of 2D-modeling to local magnetic anomalies data indicate the presence of anomalous object interpreted as basaltic rock intrusion with magnetic susceptibility contrast value of 0.0223 cgs, located at depth of 52.61 – 505.97 m and a lateral length of 1777.94 m. This rock intrudes sediment rock from the Halang Formation and is connected to other basaltic rock near the surface with magnetic susceptibility contrast value of 0.0165 cgs, located at depth of 1.94 – 80.90 m and lateral length of 751.83 m. The results of lithological interpretation are in accordance with the geological information of the research area.

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