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All Journal International Journal of Renewable Energy Development BERKALA FISIKA Journal of Physics: Theories and Applications INDONESIAN JOURNAL OF APPLIED PHYSICS Jurnal Fisika : Fisika Sains dan Aplikasinya Journal La Lifesci Jurnal Serambi Abdimas Molekul: Jurnal Ilmiah Kimia Jurnal Stasiun Geofisika Sleman (JSGS)
Mukhtar Effendi
Universitas Jenderal Soedirman
Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemistry Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Environmental Science Immunology & microbiology Materials Science & Nanotechnology Physics

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PENINGKATAN SIFAT MAGNETIK MATERIAL HEMATIT MELALUI SUBTITUSI BARIUM DAN KONTROL TEMPERATUR SINTERING Widanarto, Wahyu; Fauzi, Fuzi Nurrahman; Cahyanto, Wahyu Tri; Effendi, Mukhtar
BERKALA FISIKA 2015: Berkala Fisika Vol. 18 No. 4 Tahun 2015
Publisher : BERKALA FISIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (401.079 KB)

Abstract

Ferrite magnet or ceramic magnet is a competitive product in the magnet market due to low price, corrosion resistant and chemically stable. Barium hexa-ferrite magnet is one of ferrite magnet which is mostly used as magnetic storage and electronic devices based on nanotechnology. Barium hexa- ferrites are synthetized through solid state reaction method at sintering temperatures of 1100 °C with the composition (100-x)Fe2O3 : xBaCO3 , where x = 0 and 20 in mol % . Results of XRD characterization show that the diffraction peaks of XRD spectrum is dominated by the peaks of barium ferrite crystal with a hexagonal crystal system. Magnetic properties of Fe2O3 material doped with barium carbonate of 20 mol % and sintered at 1100 °C increase significantly compared to the others. This simple and inexpensive method is very promising for the manufacture of barium hexa-ferrite materials with natural ferrite as the main material.Keywords: Iron sand, barium ferrite, structure, magnetic properties
Numerical Analysis of Energy Converter for Wave Energy Power Generation-Pendulum System Aminuddin, Jamrud; Effendi, Mukhtar; Nurhayati, Nurhayati; Widiyani, Agustina; Razi, Pakhrur; Wihantoro, Wihantoro; Aziz, Abdullah Nur; Abdullatif, R Farzand; Sunardi, Sunardi; Bilalodin, Bilalodin; Arifin, A
International Journal of Renewable Energy Development Vol 9, No 2 (2020): July 2020
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.9.2.255-261

Abstract

The wave energy power generation-pendulum system (WEPG-PS) is a four-wheeled instrument designed to convert wave power into electric energy. The first wheel is connected to the pendulum by a double freewheel, the second and third are ordinary wheels, while the fourth is a converter component that is axially connected to the electric generator. This design used the Euler-Lagrange formalism and Runge-Kutta method to examine an ideal dimension and determine the numerical solution of the equation of motion related to the rotation speed of the wheels. The result showed that the WEPG-PS' converter system rotated properly when its mass, length, and moment of inertia are 10 kg, 2.0 m, and 0.25 kgm2, respectively. This is in addition to when the radius of the first, second, third, and fourth wheels are 0.5, 0.4, 0.2, and 0.01 m, with inertia values of 0.005, 0.004, 0.003, and 0.1 kgm2. The converter system has the ability to rotate the fourth wheel, which acts as the handle of an electric generator at an angular frequency of approximately 500 - 600 rad/s. The converter system is optimally rotated when driven by a minimum force of 5 N and maximum friction of 0.05. Therefore, the system is used to generate electricity at an amplitude of 0.3 - 0.61 m, 220 V with 50 Hz. Besides, the lower rotation speed and frequency of the energy converter of the WEPG-PS (300 rad/s) and induction generator (50 Hz) were able to generate electric power of 7.5 kW. 
Enhanced Microwave Absorption Quality of Bio-Silica-Barium-Ferrite Composites: Interplay of Fe3+ and Si4+ Widanarto, Wahyu; Effendi, Mukhtar; Cahyanto, Wahyu Tri; Ghoshal, Sib Krishna; Kurniawan, Candra; Handoko, Erfan; Alaydrus, Mudrik
Molekul Vol 18 No 2 (2023)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jm.2023.18.2.7326

Abstract

This paper reports the improved microwave (MW) absorption characteristics of some newly prepared bio-silica-barium-ferrite composites (SBFCs) of the form (x)Bio-SiO2:(80-x)Fe2O3:(20) BaO (where x = 0, 2, and 4 wt.%). These composites were prepared using the modified solid-state reaction method with simultaneous sintering at 800 and 1100 °C. SBFCs were studied to determine the impact of various bio-silica concentrations on their morphology, structure, magnetic properties, permittivity, permeability, and X-band reflection loss. Various SBFC thicknesses were simulated to determine the reflection loss curves. It has been established that the MW absorption capacity of the examined SBFCs may be altered by adjusting the bio-silica concentration and sample thickness.
Analisis Perbandingan Waktu Peluruhan Gempa Bumi Menggunakan Metode Omori dan Mogi 1 dengan Software Peluruhan V2.0 Saefurohmah, Mufti; Susanti, Dwi Budi; Effendi, Mukhtar
Jurnal Stasiun Geofisika Sleman Vol. 2 No. 1 (2024): Jurnal Stasiun Geofisika Sleman (JSGS) - Juni 2024
Publisher : Stasiun Geofisika Kelas I Sleman

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Abstract

Jumlah kejadian gempa dalam kurun waktu tertentu yang menggambarkan tingkat keaktifan seismik atau kegempaan suatu wilayah menjadi urgensi yang harus diketahui rentang waktunya. Hal ini dikarenakan aktivitas kegempaan bukan hanya kejadian sekali namun seringkali diikuti gempa susulan sehingga diperlukan penelitian yang bertujuan untuk mengetahui lama waktu yang diperlukan untuk mencapai kestabilan setelah pelepasan energi gempa. Pada penelitian ini mengambil kasus Gempa Bantul 30 Juni 2023 M 6.0. Metode yang digunakan adalah metode Omori dan metode Mogi I melalui pengaplikasian konsep regresi  linear sederhana pada software peluruhan v2.0. Data yang digunakan adalah data gempa bumi Bantul pada bulan Juni-Juli 2023 yang diperoleh dari Seiscomp4. Data tersebut diolah dalam Microsoft Excell, diselesaikan dengan konsep regresi linear sederhana, dan ditampilkan dengan grafik pada software peluruhan v2.0. Hasil menujukkan koefisien regresi dari metode omori sebesar 0,476 dengan waktu peluruhan selama 18 hari setelah gempa utama terjadi, sedangkan dari metode Mogi I didapatkan koefisien regresi sebesar -0,797 dengan waktu peluruhan selama 36 hari setelah gempa utama terjadi. Data tersebut merupakan data kalkulasi. Dari kedua metode tersebut, metode Mogi 1 dinilai lebih akurat untuk menentukkan waktu berakhirnya gempa susulan karena taksirannya lebih mendekati data observasi yang menunjukkan waktu peluruhan gempa selama 32 hari.
Pembuatan dan Pengenalan PLTS sebagai Alat Peraga di SMPIT Harapan Bunda Purwokerto Effendi, Mukhtar; Hartono, Hartono; Abdullatif, Farzand
Jurnal Serambi Abdimas Vol 5 No 2 (2024): Jurnal Serambi Abdimas
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.sa.2024.5.2.13176

Abstract

Pembuatan alat peraga dapat digunakan untuk membantu proses belajar mengajar. PLTS sebagai alat peraga untuk pembelajaran berbasis projek Projek Penguatan Profil Pelajar Pancasila (P5) sudah berhasil dibuat dan dikenalkan di SMPIT Harapan Bunda Purwokerto. Kegiatan ini bertujuan melakukan sosialisasi dan implementasi terkait konversi energi baru terbarukan. Konversi energi yang dilakukan adalah dari energi matahari menjadi energi listrik. Produk yang dihasilkan dari kegiatan ini adalah modul PLTS yang dapat digunakan sebagai peraga dalam melaksanakan Project Based Learning.Alat peraga digunakan untuk membantu menjelaskan materi yang berhubungan dengan sifat kelistrikan dan energi baru terbarukan. Pengenalan alat peraga dilakukan terhadap 39 siswa dan beberapa guru. Pemantauan respon siswa terhadap penggunaan alat peraga dilakukan menggunakan kuisioner. Respon siswa 99% menyatakan alat peraga membantu pemahaman siswa, 75% siswa menyatakan alat peraga relevan dengan materi pembelajaran, 94% siswa menyatakan alat peraga dapat meningkatkan minat belajar, 98% menyatakan dapat memicu kreativitas dan 88% siswa menyatakan perlu pembuatan alat peraga yang lain.
PERKEMBANGAN PENGGUNAAN INTELIGENSIA BUATAN SEBAGAI ALAT BANTU DIAGNOSA PENYAKIT PERIODONTITIS BERBASIS DATA CITRA RONTGEN PANORAMIK GIGI: KAJIAN PUSTAKA Gumelar, Syahrul Fadholi; Aminuddin, Jamrud; Effendi, Mukhtar
Jurnal Fisika : Fisika Sains dan Aplikasinya Vol 10 No 1 (2025): Jurnal Fisika : Fisika Sains dan Aplikasinya
Publisher : Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35508/fisa.v10i1.20771

Abstract

Kemajuan dalam bidang Inteligensia Buatan (Artificial Intelligence, AI) telah menghadirkan peluang baru dalam dunia medis, khususnya dalam analisis citra medis berbasis prinsip fisika. Penyakit periodontitis, yang merupakan infeksi kronis pada jaringan penyangga gigi, dapat dideteksi melalui pencitraan rontgen panoramik yang memanfaatkan sifat penyerapan dan hamburan sinar-X oleh struktur anatomi gigi dan tulang alveolar. Namun, analisis citra ini sering kali bergantung pada subjektivitas dokter gigi, sehingga diperlukan pendekatan komputasional untuk meningkatkan akurasi deteksi. Kajian pustaka ini bertujuan untuk mengidentifikasi metode AI yang diterapkan dalam proses diagnosis periodontitis menggunakan citra rontgen panoramik gigi. Delapan artikel ilmiah yang direview menunjukkan penggunaan teknik ekstraksi fitur seperti Gray Level Co-occurrence Matrix (GLCM) dan algoritma klasifikasi meliputi Random Forest, k-Nearest Neighbours (kNN), Convolutional Neural Network (CNN), YOLOv4, InceptionV3, dan Faster R-CNN. Evaluasi performa menghasilkan akurasi antara 64% hingga 91% dan nilai F1-score tertinggi sebesar 91,07%. Validitas metodologi pada artikel dinilai menggunakan Newcastle-Ottawa Scale (NOS) dan mayoritas menunjukkan kualitas sedang hingga tinggi. Temuan ini memperlihatkan bahwa integrasi AI dalam analisis radiografi gigi berpotensi memberikan hasil diagnosis yang lebih objektif dan efisien..
Study of Sebuku River Water Quality and Public Perception of PT ABC's Mining Activities Mujiono, Mujiono; Sastranegara, Moh. Husein; Effendi, Mukhtar
Journal La Lifesci Vol. 6 No. 3 (2025): Journal La Lifesci
Publisher : Newinera Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37899/journallalifesci.v6i3.2528

Abstract

The Sebuku River has an important role for the life of flora, fauna, and local communities in Nunukan Regency, North Kalimantan Province. Mining activities in this area raise concerns about potential water pollution. This study aimed to evaluate the impact of mining activities on the water quality of the Sebuku River. Sampling was carried out by purposive sampling at five observation stations between ST-1 and ST-5 based on predetermined coordinate points. The parameters tested included temperature, TSS, pH, DO, BOD, COD, NO₃, PO₄, CN⁻, and fecal coliform. The analysis method referred to SNI and the results are compared with class II river water quality standards in Appendix VI of Government Regulation of the Republic of Indonesia Number 22 of 2021. The results of the analysis showed that the TSS level of all stations exceeded the quality standard as the majority of respondents who stated that it was cloudy, but the level tended to decrease downstream. The highest COD parameters were detected in ST-2. This is supported by the value of the Pollution Index (PI) that indicated it as the primary pollution source from mining activities. The rest of the parameters are still within the permissible limits. Overall, the water quality of the Sebuku River is still classified as moderate based on the value of the Water Quality Index (WQI).
Enhanced Microwave Absorbing Characteristics of Cerium Barium Ferrite Composite: Effect of Sintering Temperature Variation Widanarto, Wahyu; Tamtowi, Tomy; Effendi, Mukhtar; Rahmawati, Dina; Supriyanti, Retno; Ghoshal, Sib Krishna; Kurniawan, Candra; Jatmika, Jumaeda; Handoko, Erfan; Umar, Lazuardi; Alaydrus, Mudrik
Molekul Vol 20 No 3 (2025)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jm.2025.20.3.17825

Abstract

ABSTRACT. Cerium barium ferrite composites (CeBFCs) with improved microwave absorbance in the X-band spectral region are advantageous for varied advanced applications. Thus, the influence of various sintering temperatures on the microwave-absorbing traits of CeBFCs was evaluated. The main objective was to enhance the selective microwave absorption of BFC by modifying its magnetic properties through the substitution of Fe³⁺ with Ce³⁺ in the lattice structures. Four composites of CeBF were synthesized via mechanical alloying and sintered at 600, 800, 1000, and 1100°C. The produced samples were analyzed using XRD, VSM, and VNA to determine their microstructures, magnetic properties, and microwave reflection loss at X-band frequencies. XRD results revealed a significant promotion in forming a more pure crystalline barium hexaferrite phase at sintering temperatures higher than 800°C. This structural enhancement could directly influence the magnetic properties of the specimens with a progressive increase in the saturation magnetization with rising sintering temperature. In addition, the sintering temperature variation effectively modulated the electromagnetic properties (complex relative permeability and permittivity) that are vital for impedance matching and optimal wave absorption. The composite sintered at 1000°C displayed an optimal microwave absorption, indicating the lowest reflection loss within the X-band. The obtained products were shown to attenuate and dissipate surplus electromagnetic energy within the 8-12 GHz frequency range. The observed superior performance of the composites was ascribed to a balanced interplay between the magnetic and dielectric losses, leading to efficient impedance matching. It was affirmed that careful tuning of the sintering temperature can improve the crystalline phases, magnetic, electromagnetic, and microwave absorption properties of the proposed CeBFCs. Keywords: Cerium barium ferrite, Microwave absorption, Reflection loss, Sintering temperature, X-band
Determination of absorbed dose of Palladium-103 radiation sources in prostate brachytherapy using the Monte Carlo method Effendi, Mukhtar; Nabila, Hafsyah Putri; wihantoro, wihantoro; Haryadi, Aris
Journal of Physics: Theories and Applications Vol 7, No 1 (2023): Journal of Physics: Theories and Applications
Publisher : Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jphystheor-appl.v7i1.71644

Abstract

Prostate cancer is one type of cancer that can be treated with the Brachytherapy Technique. Brachytherapy is a cancer therapy method by implanting radioactive nuclei through electromagnetic radiation from radioactive material placed near the tumor or cancer. The optimal number of implants of Palladium-103 radioactive source needs to be known to ensure the safety level before performing the therapy. The stages carried out in the research include modeling radiation sources and inhomogeneous phantoms around cancer, running the program, and processing the running data. The value of radiation absorbed dose based on the interaction of photons on organs can be obtained using the tally code *f8 in the MCNPX user code input. Based on the research results, the absorbed dose value received by each organ was successfully obtained. In addition, the variation of the implanted Palladium-103 radiation source had a significant effect on the increase of absorbed dose received by each organ. Sources were varied as 10, 11, 12, 13, 14, 15, and 16 sources, respectively. The greater the number of radiation sources implanted, the greater the absorbed dose value received by each organ.
Kinerja Inkubator Bayi dengan Pemanas Tanpa Listrik yang Dilengkapi Unit Pemantau Suhu dan Kelembaban Udara W, Wihantoro; Aziz, Abdullah N; Effendi, Mukhtar; Raharjo, Sukmaji A
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 3, No 01 (2013): April
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v3i01.1206

Abstract

An infant incubator utilizing a non-electrical heater element and an add-on temperature and relative humidity controlling unit has been produced. Copper pipe in planar spiral construction which usually found as a radiator element in refrigerator was used as the heater element. Once the hot water filled into the element, it will served as heat energy source for (40 x 58 x 40) cm3volume of incubator’s baby compartment. Compartment’s performance (P) in providing the heat energy was to be found as 0.4 J/s and the average constant temperature achievable was 34.2 oC. Two of LM35 ICs were operated as dry and wet sensor each and served as the input for temperature and humidity quantities for baby’s compartment. These both sensors were set by CV-AVR package program which then was loaded into the ATMega8535 chip. An LCDscreen of 20x2 matrices was then used in displaying these both quantities. Dry and wet temperature sensors which were used to acquire the value of air temperature and relative humidity within baby’s compartment to be found have sensitivity value of 0.02 0.01 volt/oC and 0.03 0.01 volt/oC, each.
Co-Authors - Sehah, - Abdullah Nur Aziz Aminuddin, Jamrud Aminuddin, Jamrud Arifin, A Aris Haryadi, Aris Aris Setiawan Aziz, Abdullah N B, Bilalodin Bilalodin Bilalodin Candra Kurniawan Dina Rahmawati Eiji Kominama Erfan Handoko Farzand Abdullatif Fuzi Nurrahman Fauzi, Fuzi Nurrahman Ghoshal, Sib Krishna Gumelar, Syahrul Fadholi Hartono Hartono Hiroyuki Yokoi Jatmika, Jumaeda Lazuardi Umar Moh. Husein Sastranegara Mudrik Alaydrus Mujiono Mujiono Nabila, Hafsyah Putri Nobutsuga Minami Nurhayati Nurhayati Pakhrur Razi Rafiq, Sinta Nur Mazida Raharjo, Sukmaji A Retno Supriyanti Saefurohmah, Mufti Shojiro Takeyama Sunardi Sunardi Susanti, Dwi Budi Tamtowi, Tomy W, Wihantoro Wahyu Tri Cahyanto Wahyu Widanarto, Wahyu Widiyani, Agustina Wihantoro Wihantoro