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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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Conversion of Oil Shale To Liquid Hydrocarbons as A New Energy Resources Using Iron (Fe)-Pillared Clay (Kaolinite) Catalyst Ordas Dewanto; Istifani Ferucha; Darsono Darsono; Sri Rizky
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 12, No 2 (2022): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v12i2.58414

Abstract

In the context of new energy exploration, oil shale is currently a source of energy that is being developed so that it can be used as an alternative energy in the future. Based on this background, it is important to research the conversion method of oil shale to liquid hydrocarbons. The method used is using clay (kaolinite) catalyst and  iron (Fe)-pillared clay (kaolinite) catalyst. Clay catalyst products are capable of making organic mature faster and even requiring a lower temperature for the changes (through thermal cracking of non-volatile organic material). The addition of Fe metal in the clay catalyst product to oil shale, causing the surface area of the natural clays were significantly increased, then the volume of micro pore were also increased, it causes the organic material to mature faster and the temperature required for the change is less than the shale material without Fe. The catalyst method by the pillarization technique able to increase the surface area and pore volume, thus accelerating the reaction and changing the reaction rate to be greater. It is observed that clay catalyst products can serve as catalysts for accelerating organic maturation reactions. if compared between the clay material  of OD1-Ast1 (50% clay-50% organic), OD1-Ast2 (33% clay-67% organic), and the OD1-Ast3 shale material (67% clay - 33% organic),then OD1-Ast3 has a faster reaction rate. Comparison of clay material is smaller than organic, then the properties of the catalyst product to accelerate the reaction are reduced, such as the OD1-Ast2 shale material has a slow reaction rate compared to the OD1-Ast3 shale material. The addition of Fe metal in the clay catalyst product to the OD1-Ast2 shale material, resulting in OD1-Ast2-Fe shale material (75% OD1-Ast2 and 25% Fe) having a faster reaction rate than before the addition of Fe metal.The design of heavy (%) clay (kaolinite) and Fe pilaration on oil shale were greatly influence the change of TOC values when heated,then affecting maturation and Tmax. The temperature of maturation and Tmax as the main parameters of conversion of oil shale to liquid hydrocarbon. This method supports the development of science and technology in the field of exploitation and processing of natural resources.
Pendekatan Hukum Stokes Pada Proses Terjadinya Slag Untuk Meningkatkan Efektifitas Pembersihan Cairan Logam Pada Proses Peleburan Besi Cor Muhammad Rizki Gorbyandi Nadi; Cecep Ruskandi; Ari Siswanto; Eko Koswara
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 12, No 2 (2022): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v12i2.57997

Abstract

Tujuan dari penelitian ini adalah untuk meningkatkan efektifitas pembersihan slag pada proses peleburan besi cor. Penelitian ini menghasilkan perhitungan kecepatan terminal slag muncul ke permukaan tanur induksi berdasarkan pendekatan Hukum Stokes pada masing-masing slag yang muncul saat proses peleburan besi cor. Setiap pengecoran besi cor diambil tiga buah sampel berdasarkan waktu tercepat pada slag yang sangat ringan, waktu terlambat yang dimiliki oleh slag terberat dan waktu ekstrem sebagai pembanding. Hasil dari setiap sampel dilakukan pengujian karakterisasi seperti bentuk, ukuran dan komposisi kimia pada setiap sampel yang kemudian disesuaikan dengan perhitungan yang telah dibuat. Karakterisasi dianalisa dengan menggunakan X-ray diffraction, Scanning micrsocope elektro dan energy dispersive spectroscopy micro analysis. Hasil menunjukkan bahwa pendekatan hukum stokes untuk memprediksi slag mencapai permukaan mendapatkan hasil yang sesuai bahwa seluruh slag mencapai permukaan pada waktu t = 230 s. Slag yang muncul pada waktu t = 300 s merupakan slag yang terbentuk akibat interaksi cairan dengan permukaan yang bukan merupakan slag yang terjadi dari raw material yang digunakan. Penelitian ini berhasil untuk meminimalisir terbentuknya slag pada setiap pengecoran besi cor menggunakan tanur induksi.
Identification Of Changes In Magnetic Clay Mineral Lattice Due To Batik Fabric Dyeing Process Using X-Ray Diffraction Reza Sri Mardayani; Hamidi Rifai; Letmi Dwiridal; Akmam Akmam; Fatni Mufit
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 12, No 2 (2022): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v12i2.59344

Abstract

Clay in West Sumatra has been developed as an industrial material, one of which is a natural dye for batik. The use of clay as a natural dye was previously known to have magnetic minerals contained in clay so as to produce color and resistance to fabrics. Currently, no one has investigated the types of magnetic minerals found in clay and their effect on color resistance in batik cloth, so this study aims to determine the types of magnetic minerals in clay and their effect on color resistance in batik cloth. Clay samples were taken from two areas in West Sumatra, namely Pesisir Selatan and Sijunjung. Samples were characterized from the extraction of clay using X-Ray Diffraction, where measurements were taken before and after the dyeing process on the fabric. The results showed that the types of magnetic minerals found in the clay before and after dyeing the fabric were Maghemite. In addition, the non-magnetic mineral found in clay is Quartz. The color resistance test on the CL-SPPS-210314-2 fabric sample did not change color, on the contrary, the CL-PSBSJJ-210421 fabric sample experienced quite a change from the original color of the fabric or before washing. 
Performance Enhancement of Biobattery from Tropical Almond Paste Using Acetic Acid Addition Graziani Rumbino; Lili Maniambo; Melfi Soll; Gemala Dirgantari; Octolia Togibasa
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 13, No 1 (2023): IJAP Volume 13 ISSUE 01 YEAR 2023
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v12i2.61245

Abstract

Biobattery is an alternative energy device that uses organic waste without hazardous chemicals. It is further reported that tropical almond (Terminalia catappa L.) is rich in glucose content, making it a potential electrolyte for a biobattery device, although the power performance is not optimal. Therefore, this research aims to improve the performance of biobattery from tropical almond paste with the addition of acetic acid. Biobattery cells were constructed using the galvanic cell method, while the tropical almond paste as an electrolyte was stored in a box container with a volume of 600 cm³, then attached with copper and zinc metal plate as cathode and anode. Five typical devices of biobattery were made with various acid concentrations of 0%, 10%, 20%, 40%, and 80% which were added to the electrolyte. The results showed a significant enhancement of power performance, from 0.25 mW without any acid up to 1.62 mW with acid addition. The biobattery from tropical almond paste added with acetic acid of 20% had the best performance. Based on the results, the characterization of this device had an open cell voltage of 0.93, and the power curve showed a peak value of 1.62 mW at a current of 3.29 mA, with a stable current lasting up to 200 hr.
Kajian Literatur Fase Adiabatik untuk mempercepat Dinamika Kuantum Adiabatik pada Osilator Harmonik Mayasari Hutagalung; Iwan Setiawan; Dedy Hamdani
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 13, No 1 (2023): April
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v12i2.65252

Abstract

This research is a theoretical research by reviewing the literature that discusses the method of accelerating quantum dynamics adiabatically. This method for accelerating quantum dynamics is so- called the fast-forward method. This method was proposed by Masuda and Nakamura in 2010. In this method, the ground state and first excited state wave function is modified by adding an additional term to the wave function which is called the adiabatic phase. This is done so that the time-dependent Schrodinger equation remains fulfilled. The accelerating process is carried out using an adiabatic parameter that goes to zero. Fast-forward method is applied first to get the adiabatic phase. Furthermore, by reviewing the wave function at the ground state and first excited state we get the adiabatic phase which ensures that the harmonic oscillator can move from the initial state to the final state in a shorter time.
FT-IR Spectral Model of Polyester-Cotton Fabrics with Corona Plasma Treatment using Artificial Neural Networks (ANNs) Irwan Irwan; Valentinus Galih Vidia utra; Juliany Ningsih Mohamad
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 13, No 1 (2023): April
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v13i1.67837

Abstract

Corona plasma technology has been studied as a surface modification for the adhesive bonding of polymers. Although corona plasma (C.P.) is becoming more popular in nanotechnology, the influence of corona plasma treatment parameters on the FT-IR spectra is a problem that has yet to be addressed. The purpose of this study is to use an artificial neural network to study the influence of corona plasma (C.P.) treatment parameters on textile polymer and evaluate the ability of this model to predict FT-IR spectral information from FT-IR measurements. In this study, polymers were modified under various corona plasma treatment conditions. We investigated FT-IR spectra information of polymers from FT-IR measurements by varying corona plasma treatment variables. We used three input parameters in this study: wavenumber, voltage, and exposure time—two output parameters: fabric roughness with SEM according to the degree of smoothness and percent transmission with FT-IR. The novel aspect of this study is that we used ANN to model the plasma treatment on polyester-cotton fabrics and the FT-IR spectra accurately enough for the first time. According to this study, the model that used four nodes (neurons) in the hidden layer, three input parameters (x1,x2,x3), and 20 iterations is appropriate for determining fabric surface roughness (S.R.) and percent transmission (T%). Based on this research, the values of R2 for determining fabric surface roughness (S.R.) and percent transmission (T%) were 99.79 percent and 67.18 percent, respectively. The results showed that the developed ANNs could accurately predict the experimental data in detail. This study is significant because it uses artificial intelligence to calculate and simulate the FT-IR spectra and fabric surface roughness of plasma treatment on textile fabrics. This study's scientific application is that it will help experts, researchers, and engineers understand the implications of plasma on the chemical structure of textile materials.
Functionalized Copper Phthalocyanine and Zinc Phthalocyanine as a Coating Layer on the Sensitivity of QCM-Based VOCs Sensor Masruroh Masruroh; Rachmat Triandi Tjahjanto; Gancang Saroja; Dionysius J. D. H. Santjojo
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 13, No 1 (2023): April
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v13i1.69418

Abstract

The sensitivity of a QCM-based VOCs sensor with two kinds of a metal phthalocyanine, i.e., copper phthalocyanine (CuPc) and zinc phthalocyanine (ZnPc) was examined for various VOCs. The sensitivity of the two metal phthalocyanine was determined by the compatibility of the overlapped metal orbitals (Cu(II) dan Zn(II)) and the corresponding VOCs. The CuPc and the ZnPc layer were deposited on the quartz crystal oscillator by a vacuum evaporation method. The frequency shift and the sensitivity of the sensors with the two functional layers were tested using 5 VOCs: formaldehyde, propanol, ethanol, toluene, and ketone. The CuPc sensor showed the highest sensitivity to formaldehyde. On the other hand, the ZnPc was highly sensitive to ethanol.
The Modified Glas-Mosel Formula for Numerical Investigation of the Fusion Cross-Sections of (O-16)+(Ge-70,72,73,74,76) - A Preliminary Study Yacobus Yulianto; Zaki Su'ud
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 13, No 1 (2023): April
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v13i1.41577

Abstract

Many intense experimental and theoretical studies have been performed to understand the behavior of fusion reactions, especially related to the barrier height of the interacting nuclei. This preliminary study would discuss a variation of the applicability of the Glas-Mosel formula with a little bit of modification applied to heavy systems. The modified Glas-Mosel formula has been utilized to calculate the fusion cross-sections of (O-16)+(Ge-70,72,73,74,76). To perform the differential and the optimization numerics, the Finite Difference and Nelder-Mead methods were applied to Fortran script-code respectively to assist the computational process. Referring to the obtained results, it can be indicated that the obtained results are in positive agreement with the experimental data. In addition, the modified Glas-Mosel formula proposed in this study has the capability to explain the experimental results or in predicting the fusion cross-section of nuclei. Further investigations are needed to get the crucial data to serve as a basic reference.
Analisis Produktivitas Padi berdasarkan Indeks Kekeringan (NDWI dan NDDI) Lahan Sawah menggunakan Data Citra Sentinel-2A di Kecamatan Ambulu Bowo Eko Cahyono; Rahmadin Rahagian; Agung Thahjo Nugroho
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 13, No 1 (2023): April
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v13i1.70682

Abstract

Rice is almost a staple food source for the world's population. The State of Indonesia contributes the largest amount of rice productivity, especially in the province of East Java. Ambulu District is part of the province of East Java, which has experienced a decline in rice productivity. The decline in rice productivity is thought to be the result of agricultural land drought. The purpose of this study was to determine the correlation value of the drought index (NDWI and NDDI) with rice productivity. This research was conducted using remote sensing methods using the Sentinel-2A satellite from 2016 to 2020 during the rainy season. Sentinel-2A satellite data is in the form of images, which are then cropped and digitized on agricultural land. Furthermore, the data was processed using Arcgis Software to obtain NDWI (Normalized Defense Water Index) and NDDI (Normalized Defense Drought Index) values as land dryness parameters, which were classified into 5 classes. The correlation results of the NDWI value on rice productivity have a directly proportional relationship with an effect of 61.96% and 38.04% influenced by other factors. The results of the correlation of NDDI values on rice productivity have an inverse relationship with an effect of 68.68% and 31.32% influenced by other factors
Kajian Teoritik Persamaan Diferensial Stokastik bagi Kurs Mata Uang (Forex), Kajian Khusus : Kurs IDR/USD Isa Isnawanti; Dwi Satya Palupi
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 13, No 1 (2023): IJAP Volume 13 ISSUE 01 YEAR 2023
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v13i1.52916

Abstract

Telah dilakukan kajian persamaan diferensial stokastik bagi pergerakan kurs mata uang. Kajian terhadap rapat peluang return perlu dilakukan karena rapat peluang return menggambarkan fluktuasi kurs mata uang serta mencerminkan interaksi yang terjadi di pasar keuangan. Pada penelitian ini return kurs mata uang diasumsikan mengikuti proses stokastik yang dapat digambarkan oleh suatu persamaan diferensial stokastik, sehingga distribusi rapat peluang return dapat digambarkan oleh persamaan Fokker-Planck. Data yang digunakan pada penelitian ini adalah kurs mata uang IDR/USD dari Januari 2001 sampai Januari 2021 yang diperoleh dari data kurs transaksi Bank Sentral Republik Indonesia. Distribusi rapat peluang return harian yang diperoleh mengikuti distribusi Gaussian dengan rata-rata  −0, 0001 dan sigma = 0, 0048. Berdasarkan distribusi tersebut dapat dibentuk persamaan diferensial stokastik bagi return kurs mata uang IDR/USD.

Page 23 of 27 | Total Record : 267

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