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All Journal International Journal of Renewable Energy Development BERKALA FISIKA Jurnal KOMUNIKA 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
Religion Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemistry Earth & Planetary Sciences Electrical & Electronics Engineering Energy Environmental Science Immunology & microbiology Library & Information Science Materials Science & Nanotechnology Physics

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 1 
PERANAN INTERNET SEBAGAI MEDIA KOMUNIKASI Effendi, Mukhtar
KOMUNIKA: Jurnal Dakwah dan Komunikasi Vol 3 No 2 (2009)
Publisher : Fakultas Dakwah IAIN Purwokerto

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1669.915 KB) | DOI: 10.24090/komunika.v3i2.143

Abstract

Currently, the Internet not only become an alternative communication media, but even helped form a newcommunication patterns. Nevertheless, there has been no communication science theories that can accommodatecommunication through this internet. Meanwhile, theories of communication that already exist that can be used for runwayapproach to Internet research is the theory of the uses and gratifications which focuses on media, passive and activecommunicants. Meanwhile, supporters of reference is still a concept rather than a middle-range theory. This paper seeks toexplore existing concepts in communication via the Internet based on theories that have existed from the science ofcommunication
PENGETAHUAN ILMIAH DAN KEBENARAN DALAM ILMU KOMUNIKASI Effendi, Mukhtar
KOMUNIKA: Jurnal Dakwah dan Komunikasi Vol 6 No 2 (2012)
Publisher : Fakultas Dakwah IAIN Purwokerto

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (158.471 KB) | DOI: 10.24090/komunika.v6i2.361

Abstract

Human beings have a high curiousity that leads them to produce knowledge that willhelp them to solve their problems. Their curiousity continues to exist although they have beenable to solve their problem. Through this process, the production and reproduction ofknowledge continues to exist.From the academic perspective, the answer to the curiousity of human beings areaccepted and acknowledged when it is scientifically accepted. This leads to determine the trueand false knowledge. The true knowledge are achieved when it has scientific standards ofknowledge.This article discussed the scientific truth in knowledge, especially communicationstudy which is developing rapidly. As a new science, communication study has some criteriaand measurement of truth which have some differences with other social sciences. However,communication study is really a part of social science that makes human being as its mainstudy.
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

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

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).
Co-Authors - Sehah, - Abdullah Nur Aziz Aminuddin, Jamrud Aminuddin, Jamrud Arifin, A Aris Setiawan Bilalodin Bilalodin Candra Kurniawan Eiji Kominama Erfan Handoko Farzand Abdullatif Fuzi Nurrahman Fauzi, Fuzi Nurrahman Ghoshal, Sib Krishna Gumelar, Syahrul Fadholi Hartono Hartono Hiroyuki Yokoi Moh. Husein Sastranegara Mudrik Alaydrus Mujiono Mujiono Nobutsuga Minami Nurhayati Nurhayati Pakhrur Razi Saefurohmah, Mufti Shojiro Takeyama Sunardi Sunardi Susanti, Dwi Budi Wahyu Tri Cahyanto Wahyu Widanarto, Wahyu Widiyani, Agustina Wihantoro Wihantoro