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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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Determination of the shadow zone area in the ocean computationally by simulating the propagation of acoustic rays Defrianto, Defrianto; Pratama, Nando; Malik, Usman
Science, Technology and Communication Journal Vol. 3 No. 2 (2023): SINTECHCOM Journal (February 2023)
Publisher : Lembaga Studi Pendidikan and Rekayasa Alam Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59190/stc.v3i2.228

Abstract

Simulation of acoustic wave propagation to determine the shadow zone area using computational methods has been carried out using negative value gradients. The study was conducted by varying the angle of incidence and variations in the length of the beam used. This research was conducted by comparing analytical results with computational results. The results of this study indicate that at a depth of 500 meters with a sound speed of 1493.1 m/s, a beam length of 1 meter, and a gradient pattern of -0.1, a maximum angle of 0.255 radians is obtained with the shadow zone area being at a depth of 0 to 800 meters and a distance of 5000 meters of wave source. The value of the difference or error in analytical data and computational data is 0.0817%.
Effect of chemical ions on oil palm midribs and leaves by direct electric voltage treatment Defrianto, Defrianto; Suhardi, Suhardi; Roslim, Dewi Indriyani; Awitdrus, Awitdrus
Science, Technology and Communication Journal Vol. 3 No. 3 (2023): SINTECHCOM Journal (June 2023)
Publisher : Lembaga Studi Pendidikan and Rekayasa Alam Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59190/stc.v3i3.233

Abstract

The productivity of palm trees grown is generally measured in monthly and yearly periods, but on a shorter time scale, it is particularly measured by the plant maintenance of palm trees. Consideration of the general productivity in time is how to produce good fruit fertilizer (chemical aspect), healthy plants, fast growing and evolving (agricultural aspect), and genetic type of palm that grows (biological aspect). However, the growth and production on the physical aspect is still less attention. Through physical treatment, the growth of palm trees can be optimized to support aspects of the previous aspects, as it has been proven in advanced countries on the plant's aloe vera, avocado, and pine trees. In this paper, the methodology proposes a direct current voltage treatment to the palm tree that can accelerate the flow of ions to grow and develop nutrients. The palm tree samples are aged 1 to 5 years corresponding to the provision of 10, 16, 25, 35, and 50 V for each of the ages of the palm tree respectively. Identifying samples before and after treatment by electricity is based on the geometry of leaves, midribs, and ions effect. There have been reduced and increased levels of nutrients. This identification can optimize the productivity of palm trees.
Performance analysis of metamaterial antennas based on variations in combination and radius of hexagonal SRR Soerbakti, Yan; Defrianto, Defrianto; Rini, Ari Sulistyo; Asyana, Vepy
Science, Technology and Communication Journal Vol. 4 No. 1 (2023): SINTECHCOM Journal (October 2023)
Publisher : Lembaga Studi Pendidikan and Rekayasa Alam Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59190/stc.v4i1.250

Abstract

The low antenna performance is a concern for researchers to overcome in modern technology. As an effort to overcome this problem, the application of the metamaterial structure to the antenna was carried out to increase the antenna parameters. This study aims to analyze the effect of antenna performance due to the influence of variations in the combination and radius of the SRR hexagonal metamaterial. The research was conducted in a simulation, starting with designing the antenna structure with the metamaterial of two rings into a resonator with a radius variation of 2.5 mm and 2.7 mm, then combining one to four hexagonal SRRs. The results showed that the highest antenna performance was obtained from a combination of four hexagonal SRRs for a radius of 2.7 mm with parameter values in the form of return loss -38.95 dB, a bandwidth of 7.88 GHz at a working frequency of 1.12 – 9.00 GHz and a gain of 5.92 dBi.
One-dimensional analysis of underground water using geoelectric methods Malik, Usman; Defrianto, Defrianto; Zulfa, Zulfa; Saputra, Yohanes Dwi; Muhammad, Juandi
Science, Technology and Communication Journal Vol. 4 No. 1 (2023): SINTECHCOM Journal (October 2023)
Publisher : Lembaga Studi Pendidikan and Rekayasa Alam Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59190/stc.v4i1.252

Abstract

The regional development issues in Tambang Kampar District that are most important to solve are environmental issues related to surface water potential and limited clean water. Environmental potential through good environmental management can become potential natural resources that can be utilized to support the regional economic sector. Groundwater potential needs to be studied and interpreted in the matrix of groundwater resource management through geophysical studies, namely by using the geoelectric method. This matrix will be able to provide solutions to environmental problems with the potential for fresh water in Tambang District, Kampar, thereby supporting economic growth in terms of meeting water needs. The material that is the object of research is underground water, and the aspects of research that will be studied include clean water exploration and environmentally friendly management patterns of potential underground water resources. The research location is Tambang District, Kampar, Riau Province. The targeted finding is an environmental management model of potential underground water resources in Tambang Kampar District using the Schlumberger rule geoelectrical method. Fundamental contributions to a field of science are geophysics and environmental science disciplines related to groundwater availability.
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.
Simulation and analysis of triangular structure metamaterial properties at microwave frequencies for medical sensor applications Amalia, Riska; Defrianto, Defrianto; Soerbakti, Yan; Asyana, Vepy; Abdullah, Hewa Yaseen
Science, Technology, and Communication Journal Vol. 5 No. 1 (2024): SINTECHCOM Journal (October 2024)
Publisher : Lembaga Studi Pendidikan dan Rekayasa Alam Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59190/stc.v5i1.286

Abstract

The development of antenna technology is increasingly developing in medical sensor applications. The medical sensor antenna can be strengthened with a split ring resonator (SRR) metamaterial structure. Metamaterial is an artificial material that has high resonance manufacturing properties and this can potentially be implemented into microstrip antenna structures. This research aims to design, simulate and analyze the characteristics of metamaterials regarding the frequency function and performance of an antenna combination of 1 – 4 metamaterials with a triangular SRR ring radius of 3.5 mm. The results of this research show that the metamaterial characteristics of permittivity, permeability and refractive index are negative. Furthermore, in the antenna application, the implementation of a 4 SRR triangular metamaterial combination structure has more optimal performance. The results show that antenna performance parameters produce return loss is -41.18 dB, the bandwidth is 3.86 GHz and gain is 3.82 dBi with an omnidirectional radiation pattern.
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.
Analysis of bending losses in single-mode optical fiber for determining optical signal quality Ramadhani, Fatima Nur; Saktioto, Saktioto; Zulkarnain, Zulkarnain; Defrianto, Defrianto; Fadhali, Mohammed M
Science, Technology, and Communication Journal Vol. 5 No. 3 (2025): SINTECHCOM Journal (June 2025)
Publisher : Lembaga Studi Pendidikan dan Rekayasa Alam Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59190/stc.v5i3.324

Abstract

Optical fiber is an advanced transmission medium composed of glass fibers, offering significantly higher data transfer speeds compared to conventional electrical cables. This study aims to analyze power loss resulting from bending in single-mode optical fibers (SMF) to assess the impact on optical signal quality. Five distinct SMF types were simulated using OptiFiber software at wavelengths of 1310 nm and 1550 nm, with bending radii varying from 20 – 46 mm in increments of 2 mm. The results demonstrate that power attenuation in optical fibers is affected by the wavelength of operation and bend radius. At a wavelength of 1310 nm, the highest material loss was recorded in SMF-28 at 0.0125 dB/km, whereas at 1550 nm, SMF-28 exhibited the highest material loss of 31.963 dB/km. Moreover, an increase in bending radius results in a reduction of bending losses, while a decrease in bending radius leads to a significant increase in losses. These insights contribute to the development of improved fiber optic cable designs by advocating the use of enhanced protective shielding to mitigate bending-induced signal degradation.
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.
Co-Authors Abdullah, Hewa Yaseen Ade Saputra Agrina, Agrina Andika Thoibah Andika Thoibah Andri Saputra Anita, Sofia Asyana, Vepy Awitdrus Awitdrus, Awitdrus Azura ' Busmayaril Busmayaril Debora M Sinaga Dedi Irawan dedi irawan Dedi Irawan Dewi Indriyani Roslim Dino Yanuardi Dwi Putri Cahya Safitri Eri Wiyadi Ernayenti, Ernayenti Erwin ' Erwin Amiruddin Erwin Erwin Erwin, ' Fadhali, Mohammed Fadhali, Mohammed M Fitri, Rika Haryana Hairi Juandi Juandi Kisna Pertiwi Krisman ' Kurnia, Erwin 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, Minarni Moh Danil Hendry Gamal Muhammad Luthfi Mutathahirin, Mutathahirin Mutiara Akhdesia Nuraina Fika Lubis Nurwijayanti Okfalisa Okfalisa Pratama, Nando Putri, Ika Aprilla Rabin, Mohammed Fisal Rahman Kurniawan Rahmi Dewi Rahmondia N. Setiadi Ramadhani, Fatima Nur Reynal Nur Razzaq Riad Syech Riad Syech Rina Afriza Rina Amelia Rini, Ari Sulistyo Rini, Ari Sulistyo Risanto, Joko Riska Amalia Rofeah ' Romi Fadli Syahputra Rosmely, Wirna Sakinah, Feby Nur Saktioto Saktioto Saktioto, Saktioto Salomo ' Salomo Salomo Sandra Septiana Septi Pramuliawati Siti Fatimah Soerbakti, Yan Soerbakti, Yan Sofia Anita Suhaivi Hamdan Suhardi Suhardi Sultan Fiddunya Fiddunya Syahid, Syafira Irma Syahril Syahril Syamsudhuha Syamsudhuha Tengku Emrinaldi Titrawani Titrawani Usman Malik Usman Usman Vepy Asyana Vira Marselly Vivina Eprillison Wahyu Candra Walfred Tambunan Wildan Adli Wima Puspita Wirianto, Hazmi Yan Soerbakti Yan Soerbakti Yohanes Dwi Saputra, Yohanes Dwi Yupapin, Preecha Zahroh, Siti Zamri, Zamri Zulfa Zulfa Zulhawati Zulkarnain Zulkarnain