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All Journal Jurnal Keteknikan Pertanian Komunikasi Fisika Indonesia TELKOMNIKA (Telecommunication Computing Electronics and Control) Indonesian Journal of Electrical Engineering and Informatics (IJEEI) Pendidikan Ekonomi Jurnal Online Mahasiswa (JOM) Bidang Matematika dan Ilmu Pengetahuan Alam Journal of Aceh Physics Society JOURNAL ONLINE OF PHYSICS Unri Conference Series: Community Engagement UNES Journal of Swara Justisia JRAP (Jurnal Riset Akuntansi dan Perpajakan) Science, Technology, and Communication Journal Al-kayyis: Journal of Islamic Education
Defrianto Defrianto
Unknown Affiliation
Religion Agriculture, Biological Sciences & Forestry Humanities Computer Science & IT Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Physics Social Sciences Other

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PEMODELAN KECEPATAN ALIRAN DARAH PADA DOMAIN MENYERUPAI PEMBULUH DARAH DENGAN FEATOOL MULTIPHYSICS Andika Thoibah; Defrianto Defrianto; Saktioto Saktioto
Komunikasi Fisika Indonesia Vol 20, No 1 (2023)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.20.1.19-24

Abstract

Currently, computer-based simulation methods are widely used in blood flow analysis. The application of this method has been widely used in modeling blood vessels. This article presents an example of a simple blood vessel modeling to determine the velocity of blood flow to the viscosity of blood in the blood vessels. The mathematical model of human blood flow through vascular ramifications was studied using finite element analysis (FEA), which is applied to the stable two-dimensional flow of viscous fluids through various shapes. Flow through a two-dimensional model of aortic vessels, capillaries, and veins is simulated. The velocity distribution through the blood vessels is calculated. The validity of the calculation method is determined by comparing the numerical results with other results. The implementation of the Navier-Stokes equation in a vascular model using the finite element method shows that the velocity of blood flow depends on the viscosity. The higher the viscosity of the blood, the slower the rate of blood flow in the veins.
Simplified Kinetic Model of Heart Pressure for Human Dynamical Blood Flow Saktioto Saktioto; Defrianto Defrianto; Andika Thoibah; Yan Soerbakti; Romi Fadli Syahputra; Syamsudhuha Syamsudhuha; Dedi Irawan; Haryana Hairi; Okfalisa Okfalisa; Rina Amelia
Indonesian Journal of Electrical Engineering and Informatics (IJEEI) Vol 11, No 3: September 2023
Publisher : IAES Indonesian Section

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52549/ijeei.v11i3.3473

Abstract

The blood flow that carries various particles results in disturbed physical flow in the heart organ caused by speed, density, and pressure. This phenomenon is complicated resulting in a wide variety of medical problems. This research provides a mathematical technique and numerical experiment for a straightforward solution to cardiac blood flow to arteries. Finite element analysis (FEA) is used to study and construct mathematical models for human blood flow through arterial branches. Furthermore, FEA is used to simulate the steady two-dimensional flow of viscous fluids across various geometries. The results showed that the blood flow in the carotid artery branching is simulated after the velocity profiles obtained are plotted against the experimental design. The computational method's validity is evaluated by comparing the numerical experiment with the analytical results of various functions.
Analysis of temperature patterns in Pekanbaru City using fractals and artificial neural networks based on monthly temperature data Reynal Nur Razzaq; Defrianto Defrianto
Indonesian Physics Communication Vol 21, No 1 (2024)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.21.1.79-90

Abstract

Climate and global warming play a crucial role in the lives of living organisms on Earth. Temperature, varying in each region, is a vital aspect in climate observation. This study analyzed temperature fluctuations in Pekanbaru from 2016 to 2022 using fractal analysis and backpropagation artificial neural networks. The research findings revealed that temperature prediction with backpropagation artificial neural networks was quite accurate. However, errors during testing or validation could impact the comparison with the target values. Fractal analysis indicated a persistent tendency in temperature fluctuations in Pekanbaru, with a Hurst exponent of 0.7993 and a fractal dimension of 1.2007. Nevertheless, temperature fluctuations were also influenced by other factors, leading to varying levels of stability over certain periods. Thus, the temperature in Pekanbaru can be considered a complex system with diverse fluctuation patterns and varying levels of complexity.
Analysis and modelling of the characteristics of telecommunication antennas utilising metamaterials with a circular structure Defrianto, Defrianto; Saktioto, Saktioto; Anita, Sofia; Zahroh, Siti; Soerbakti, Yan; Emrinaldi, Tengku
Indonesian Physics Communication Vol 21, No 3 (2024)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.21.3.233-238

Abstract

The development of telecommunication antenna technology is increasingly being considered with the need for high and practical antenna performance. The antenna technology can be realized by using the split ring resonator (SRR) metamaterial structure. SRR metamaterial is a periodic material that has minimal manufacturing dimensions and is able to work at high frequencies. The ability of this metamaterial has the potential to be implemented in microstrip antenna structures as telecommunication applications. This study aims to design, simulate and analyze the characteristics of SRR-Circle metamaterials against the frequency function and application performance as a telecommunication antenna. The process is carried out using the Computer Simulation Technology (CST) Studio Suite Software which is operated at a working frequency of 0.009 – 9 GHz. The metamaterial structure is combined from 1 – 4 SRRs in the shape of a Circle with a fixed radius of 3.5 mm. The results of this study indicate the characteristics of metamaterials with negative values in relative permittivity (ɛᵣ), relative permeability (μᵣ) and refractive index (n) with the highest values in the metamaterial structure of the combination of 4 SRR-Circles, each with values of -144.33 Farad/m, -9.29 H/m and -9.07. In its application as a telecommunications antenna, metamaterials have succeeded in improving antenna performance. The highest antenna performance was obtained in the combination structure of 4 SRR-Circles with a return loss value of -34.37 dB, and a bandwidth of 1.00 GHz at a VSWR of 6.77 – 7.77 GHz. The results of this antenna performance have the potential to be applied to telecommunications antenna technology such as satellites, radars and 5G networks.
Enhancing rural teacher competence in Meranti Islands Regency high school basic physics practical curriculum Saktioto, Saktioto; Defrianto, Defrianto; Rini, Ari Sulistyo; Irawan, Dedi; Agrina, Agrina; Anita, Sofia; Soerbakti, Yan; Rabin, Mohammed Fisal
Indonesian Physics Communication Vol 21, No 3 (2024)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.21.3.%p

Abstract

Teacher competency standards serve as benchmarks that can be utilised to assess the attributes deemed essential for professional competence in educators. Educators play a crucial and strategic role in the pursuit of national development objectives, particularly within the realm of education. However, the objective of education appears to be a reduction in competency standards at the conclusion of each academic year for specific subjects, particularly in the realm of science and Basic Physics. Consequently, this initiative seeks to inspire educators and students in secondary education to enhance their understanding of the educational process by engaging in the study of science, specifically Basic Physics, utilising appropriate tools and resources. The suggested mode of engagement involves the processes of instruction and education within secondary educational institutions across the Meranti Islands Regency, encompassing SMA, MAN, MTs, and SMP levels. This activity further offers insights into experiments and demonstration tools for educators in the realm of science and Basic Physics, facilitating a comprehension of concepts that range from simple to intricate natural phenomena through accessible demonstration media designed for practical application. In this manner, educators are anticipated to exhibit motivation and enthusiasm throughout the learning process, accompanied by a thorough and nuanced comprehension of the subject matter. To enhance teacher competency standards significantly, ensuring they become more qualified and professional.
Potential multi-detection manifestation of ultra-sensitive sensors based on ZnO thin films and metamaterials Defrianto, Defrianto; Soerbakti, Yan; Saktioto, Saktioto; Rini, Ari Sulistyo; Fadhali, Mohammed; Yupapin, Preecha
Science, Technology and Communication Journal Vol. 5 No. 1 (2024): SINTECHCOM Journal (October 2024)
Publisher : Lembaga Studi Pendidikan and Rekayasa Alam Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59190/stc.v5i1.265

Abstract

This study aims to observe the ability of a thin layer of zinc oxide (ZnO) which is applied to sensor technology. Currently, the low detection limit of the sensor is a problem in its use. Metamaterials offer resonant properties in increasing sensitivity, but their performance is still below the current high modern technology. The high engineering properties of metamaterials provide opportunities for realizing renewable metamaterials. ZnO thin layer semiconductor material as a transparent conductive oxide can provide a wide detection potential. The ability of ZnO thin films to be adapted to metamaterial sensors can be further investigated and improved for the future.
Intensifikasi Kompetensi Guru Desa dalam Penguatan Kurikulum Praktikum Fisika Dasar di Tingkat Sekolah Menengah se-Kabupaten Kepulauan Meranti Saktioto, Saktioto; Defrianto, Defrianto; Rini, Ari Sulistyo; Irawan, Dedi; Agrina, Agrina; Anita, Sofia; Soerbakti, Yan; Rabin, Mohammed Fisal
Unri Conference Series: Community Engagement Vol 6 (2024): Seminar Nasional Pemberdayaan Masyarakat
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/unricsce.6.766-771

Abstract

Teacher competency standards are indicators that can be used as a measure of teacher characteristics that are considered professionally competent. Teachers have a very strategic role in efforts to realize national development goals, especially in the field of education. However, the goal of education is to experience a decline in competency standards at the end of each year for certain subjects, especially science / Basic Physics. Therefore, this service aims to motivate educators and students at the secondary school level to raise awareness of the education process through the practice of learning science / Basic Physics using adequate equipment and materials. The proposed form of activity is in the form of teaching and learning in secondary schools throughout the Meranti Islands Regency including SMA, MAN, and MTs, and SMP levels. In addition, this activity also provides guidance on experiments and demonstration tools for science / Basic Physics teachers regarding understanding concepts from simple to complex natural phenomena through simple demonstration media for practical tools. That way, teachers are expected to be motivated and enthusiastic in the learning process with a good and comprehensive understanding of the material. So that it can increase teacher competency standards intensively to be more qualified and professional.
Exploration of Analyte Electrolyticity Using Multi-SRR-Hexagonal DNG Metamaterials and ZnO Thin Films Defrianto, Defrianto; Saktioto, Saktioto; Rini, Ari Sulistyo; Syamsudhuha, Syamsudhuha; Anita, Sofia; Soerbakti, Yan
Indonesian Journal of Electrical Engineering and Informatics (IJEEI) Vol 13, No 2: June 2025
Publisher : IAES Indonesian Section

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52549/ijeei.v13i2.6085

Abstract

Advanced engineered metamaterials (MTMs) significantly contribute to modern technological advancements, particularly through hybridization with semiconductor materials like zinc oxide (ZnO), which enhance sensor sensitivity and performance. This study aims to investigate the optical properties of hybrid MTMs and develop a novel sensor medium capable of detecting early electrolytic behaviors of analytes. Utilizing the finite-difference time-domain (FDTD) method, the sensor was designed, characterized, and integrated, featuring a hexagonal multi-cell split ring resonator (SRR) structure coated with a 200-nm ZnO thin film. The geometry of the SRR MTM was optimized using a modified Nicolson-Ross-Weir electromagnetic field function method. Results demonstrate that the MTM exhibits double-negative optical characteristics with a performance index reaching 102. Moreover, the sensor presents dual-band resonance frequencies for reflection and transmission attributed to the combination of the multi-SRR hexagonal design and ZnO coating, with an absorption peak at 8.71 GHz. Testing the sensor in varying electrolytic conditions, such as seawater, revealed a measurable reduction in resonance depth and increased sensitivity, characterized by a frequency shift of 5.25 MHz per 0.7 S/m increment in electrical conductivity. These findings highlight the MTM sensor's potential as an effective tool for enhancing spectrum readout accuracy and sensitivity in analyte detection applications.
PENEGAKAN HUKUM PADA TINGKAT PENYIDIKAN TERHADAP PELAKU TINDAK PIDANA PENGEDARAN SEDIAAN FARMASI TANPA IZIN DI KOTA SOLOK Defrianto, Defrianto; Rosmely, Wirna
UNES Journal of Swara Justisia Vol 3 No 2 (2019): Unes Journal of Swara Justisia (Juli 2019)
Publisher : Program Magister Ilmu Hukum Universitas Ekasakti

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

Abstract

Article 197 Law number 36 of 2009 concerning Health stipulates that "everyperson who intentionally produces or distributes pharmaceutical preparations and / ormedical devices that do not have a distribution permit is given criminal sanctions andfines". For this matter, it is necessary to grant permits in the distribution ofpharmaceutical preparations, to protect the public from pharmaceutical preparations thatdo not meet the requirements, protect the public from misuse and misuse of pharmaceuticalpreparations and medical devices. This needs supervision from the Police in supervisingpharmaceutical preparations, this is done by Satreskrim Solok City Police, who havereceived a Police Report from the community on December 13, 2016. This research is adescriptive analytical study. Adapaun the results of research on law enforcement at thelevel of investigation of perpetrators of criminal acts of distribution of pharmaceuticalpreparations without permission in the city of Solok occurred in the report on December13, 2016, after the report was received, Satok District Police issued LP / 89 / A / XII /2016-SEKTA, then Investigation, Investigation, Examination of witnesses, Information ofExperts, Suspects and determining the elements of the Criminal Act which are suspected ofbeing violated by the suspect. Secondly, the obstacle encountered by Solres Kota police inlaw enforcement against criminal acts circulating pharmaceutical preparations withoutpermission in Solok City: a) Limited budget funds; b) Number of Investigators who are notbalanced with the breadth of work area; c) Modus Operandi carried out by the perpetratoris always changing; d) Other agencies that are less cooperative; e) expert witnesses aredifficult to bring; and f) Difficulties in bringing and presenting witnesses concerned withcases of pharmaceutical preparations without permission to eat the old procedure, becausethere are several witnesses who do not want to come or even not be asked to be questionedby members of the auxiliary investigators who examine. Third, efforts to overcome theobstacles in law enforcement against criminal acts circulating pharmaceuticalpreparations without permission in the city of Solok, by making repressive efforts andPreventive efforts.
Efforts of Religious Education Teachers in Diagnosing Students' Learning Difficulties Syahid, Syafira Irma; Fitri, Rika; Ernayenti, Ernayenti; Rahmita, Rahmita; Busmayaril, Busmayaril; Defrianto, Defrianto; Mutathahirin, Mutathahirin
Al-kayyis: Journal of Islamic Education Vol. 3 No. 1 (2025): June
Publisher : Al-kayyis: Journal of Islamic Education

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

Abstract

Islamic Religious Education is something very valuable for a person; it cannot be denied that through Islamic Religious Education we can distinguish a person's character. Through Islamic Religious Education, a person can become obedient and devout. However, there are several efforts that must be made before achieving maximum results, namely the efforts of an Islamic Religious Education teacher in diagnosing or identifying students' learning difficulties. This study aims to identify the learning difficulties students face during the learning process, which the teacher then describes. This study employs a qualitative approach with a descriptive method, with data sources derived from observations, interviews, and documentation. The research findings indicate that teachers' efforts in diagnosing learning difficulties are already being implemented effectively, but their execution is not yet optimal. This is evident first in the fact that Islamic Religious Education teachers have not yet maximized classroom observations to observe students' deviant behavior during lessons. the implication is that the efforts of Islamic Education teachers in diagnosing learning difficulties through interviews with parents have been going well, but they are still not maximizing their efforts to interview parents to find out the family conditions that are causing problems for students in their learning. Therefore, the approach taken by teachers should not be limited to telephone calls without visiting the homes of students who are experiencing learning difficulties. Teachers should visit the homes of students who are experiencing learning difficulties in order to find out what problems the students are facing.
Co-Authors Ade Saputra Agrina, Agrina Andika Thoibah Andika Thoibah Andri Saputra Anita, Sofia Awitdrus Awitdrus, Awitdrus Azura ' Bambang Widiyatmoko Busmayaril Busmayaril Debora M Sinaga Dedi Irawan dedi irawan Dedi Irawan Dedi Irawan Dewi Indriyani Roslim Dewi Indriyani Roslim Dino Yanuardi Dwi Hanto Dwi Putri Cahya Safitri Eri Wiyadi Ernayenti, Ernayenti Erwin ' Erwin Amiruddin Erwin Erwin Erwin Kurnia Erwin, ' Fadhali, Mohammed Fatima Nur Ramadhani Feby Nur Sakinah Haryana Hairi Hazmi Wirianto Hewa Yaseen Abdullah Ika Aprilla Putri Juandi Juandi Juandi Muhammad Kisna Pertiwi Krisman ' Lazuardi Lazuardi Lazuardi Umar Lifa Anggar Mayasari Lihayardi Lihayardi M Ikhsan M. Rasyid Ridho Maksi Ginting Mbantun Ginting Meiliyah Ariani, Meiliyah Melani Seprima Minarni Shiddiq Moh Danil Hendry Gamal Mohammed M Fadhali Mutathahirin, Mutathahirin Mutiara Akhdesia Nando Pratama Nuraina Fika Lubis Nurfi Hikma Nurwijayanti Okfalisa Okfalisa Okfalisa Okfalisa Rabin, Mohammed Fisal Rahman Kurniawan Rahmi Dewi Rahmondia N. Setiadi Reynal Nur Razzaq Riad Syech Riad Syech Rika Fitri Rina Afriza Rina Amelia Rini, Ari Sulistyo Rini, Ari Sulistyo Risanto, Joko Riska Amalia Rofeah ' Romi Fadli Syahputra Rosmely, Wirna Saktioto Saktioto Saktioto Saktioto Saktioto, Saktioto Salomo ' Salomo Salomo Sandra Septiana Septi Pramuliawati Siti Fatimah Soerbakti, Yan Soerbakti, Yan Sofia Anita Suhaivi Hamdan Suhardi Suhardi Suhardi Suhardi Sultan Fiddunya Fiddunya Syahid, Syafira Irma Syahril Syahril Syamsudhuha Syamsudhuha Tengku Emrinaldi Tengku Emrinaldi Titrawani Titrawani Usman Malik Usman Malik Vepy Asyana Vepy Asyana Vepy Asyana Vira Marselly Vivina Eprillison Wahyu Candra Walfred Tambunan Wildan Adli Wima Puspita Yan Soerbakti Yan Soerbakti Yan Soerbakti Yohanes Dwi Saputra Yupapin, Preecha Zahroh, Siti Zamri Zamri Zulfa Zulfa Zulhawati Zulkarnain Zulkarnain