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All Journal International Journal of Applied Power Engineering (IJAPE) SITEKIN: Jurnal Sains, Teknologi dan Industri ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika Jurnal Pengabdian Kepada Masyarakat (Indonesian Journal of Community Engagement) Journal of Applied Geospatial Information Eksakta : Berkala Ilmiah Bidang MIPA Prisma Sains: Jurnal Pengkajian Ilmu dan Pembelajaran Matematika dan IPA IKIP Mataram Logic : Jurnal Rancang Bangun Dan Teknologi EINSTEIN (E-JOURNAL) Jurnal Pengabdian Masyarakat Bangsa Jurnal Rekayasa Energi Journal of Engineering and Technological Sciences Jurnal Teknik Elektro Jurnal Ilmiah Teknik Mesin, Elektro dan Komputer
Doli Bonardo
Universitas Maritim Raja Ali Haji
Aerospace Engineering Agriculture, Biological Sciences & Forestry Arts Humanities Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Nursing Physics Public Health Social Sciences Other

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NALISIS STRUKTUR NANO PARTIKEL SILIKA DARI ABU AMPAS TEBU MENGGUNAKAN METODE XRD Doli Bonardo; Raptama Siburian
EINSTEIN (e-Journal) Vol 8, No 3 (2020): EINSTEIN (e-Journal)
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (477.362 KB) | DOI: 10.24114/einstein.v9i1.23550

Abstract

Nano silika disintesis dari abu ampas tebu dengan variasi suhu pembakaran awal 300 C, 400 C, 500 C dan 600 C menggunakan metode kopresipitasi. Tujuan analisis struktur ini adalah untuk mengidentifikasi sistem kristal nano silika yang terbentuk, fasa kristal yang muncul dan ukuran kristal nano silika yang terbentuk serta untuk mengetahui bagaimana pengaruh suhu pembakaran awal abu ampas tebu terhadap nano silika yang dihasilkan ditinjau dari ketiga parameter tersebut. Dari analisis XRD, diperoleh difraktogram yang menunjukkan keempat nano silika yang diuji memiliki 2 fasa kristal, yaitu fasa silika dan garam. Suhu pembakaran awal pada abu ampas tebu sangat mempengaruhi jumlah fasa silika yang terbentuk. Semakin tinggi suhu pembakaran awal abu ampas tebu, maka semakin meningatkan kuantitas fasa silika yang terbentuk. Selain itu sistem kristal yang muncul pada masing-masing nano silika berturut-turut adalah kubik, trigonal, heksagonal dan tetragonal. Dengan menggunakan persamaan Debye Scherrer yang telah dimodifikasi, diketahui bahwa ukuran kristal nano silika yang dihasilkan semakin kecil seiring bertambahnya suhu pembakaran awal terhadap abu ampas tebu.
SINTESIS DAN KARAKTERISASI NANO PARTIKEL SILIKA DARI ABU AMPAS TEBU SEBAGAIFILLER ALUMINIUM Doli Bonardo Hasan; Karya Sinulingga
EINSTEIN (e-Journal) Vol 5, No 2 (2017): EINSTEIN
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (587.571 KB) | DOI: 10.24114/einstein.v5i2.11839

Abstract

Sintesis dan karakterisasi nano partikel silika dari abu ampas tebu bertujuan untuk mengetahui hubungan antara variasi suhu pembakaran awal terhadap struktur morfologi, ukuran partikel dan kristalnya, fasa yang terbentuk serta kekuatan tarik campuran antara nanosilika terbaik dengan aluminium. Abu ampas tebu kemudian dibakar didalam furnace selama 2 jam dengan suhu divariasikan 300oC, 400oC, 500oC dan 600oC. Selanjutnya sampel dimillingselama 4 jam dengan kecepatan 250 rpm. Nanosilika disintesis menggunakan metode kopresipitasi dengan larutan HCl 1 M dan NaOH 1 M. Sedangkan metode pencampuran aluminium dengan nanosilika menggunakan metode metalurgi serbuk. Dari analisis XRD, keempat sampel memiliki fasa silika dan garam sebagai fasa pengotor. Kenaikan suhu pembakaran awal, menyebabkan menurunnya ukuran kristal yaituyang terbesar 78,43 nm (300oC), dan yang terkecil 34,72 nm (600oC). Dari hasil PSA menunjukkan ukuran partikel nanosilika terbesar 245,5 nm (300oC), dan terkecil 38,9 nm (600oC). Dari analisis SEM, diperoleh keempat morfologi nanosilika menunjukkan butiran yang kurang rapat. Dari pengujian UTM, diperoleh modulus young campuran aluminium dengan nanosilika sebesar 1769,4 Mpa.Kata Kunci: Abu Ampas Tebu, Suhu Pembakaran Awal, Metode Kopresipitasi, Nanosilika
Analysis of Current Limiter Electronics for Solar Pumps: Evaluating Performance in Varied Sunlight Intensities Berkadh Simanjuntak; Marhaposan Situmorang; Marzuki Sinambela; Doli Bonardo
Prisma Sains : Jurnal Pengkajian Ilmu dan Pembelajaran Matematika dan IPA IKIP Mataram Vol 12, No 1: January 2024
Publisher : IKIP Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33394/j-ps.v12i1.10048

Abstract

This research investigates the implementation and efficacy of a current limiter electronics system within solar pump systems, focusing on its ability to regulate current under varying sunlight intensities, encompassing both strong and weak illumination conditions. To assess the system's performance, an experimental setup integrates the solar pump system with the current limiter electronics, subjecting it to a range of sunlight intensities. Under optimal conditions, the current limiter adeptly controlled current flow, maintaining it within specified limits (2.54 A to 3.90 A) as incident sunlight intensity varied from 1000 W/m³ to 2000 W/m³. Equally impressive was the system's capability to navigate reduced sunlight, adjusting current flow (1.20 A to 2.10 A) in response to lower intensities (500 W/m³ to 1300 W/m³). These findings not only advance our comprehension of current limiting techniques in solar pump systems but also offer valuable insights for future solar-powered system designs and implementations. Overall, the research underscores the vital role of a dependable current limiter electronics system in optimizing current flow across varying sunlight intensities, from strong to weak, within solar pump systems.
Preparation and Analysis of Dual-Property Coated Metal Foams for Potential Wick Structures in Heat Pipe Applications Bonardo, Doli; Hollanda Arief Kusuma; Muhammad Tanveer; Dharma, Budi; Amri, Fauzan
EKSAKTA: Berkala Ilmiah Bidang MIPA Vol. 26 No. 01 (2025): Eksakta : Berkala Ilmiah Bidang MIPA (E-ISSN : 2549-7464)
Publisher : Faculty of Mathematics and Natural Sciences (FMIPA), Universitas Negeri Padang, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/eksakta/vol26-iss01/530

Abstract

Hydrophilic and hydrophobic coated metal foams have been successfully prepared via a cleaning procedure and a simple spraying technique to be used as a wick structure in a heat pipe. The main object of this work is to explore the effect of hydrophilic and hydrophobic layers on the metal foam and to study the properties of the metal foams. To achieve this goal, 3D-OM analyses were performed to identify the pore size of the metal foam. To observe the surface morphology and porosity of the metal foam, SEM analysis was carried out and succeeded in observing the changes in the surface roughness of the hydrophilic and hydrophobic coated metal foams. The pore diameter, porosity and density of metal foam were 633.38 µm, 48.46% and 4.62 g/cm3, respectively. FT-IR analysis was also performed with the results showing that the hydrophobic coating did not affect the overall molecular group composition. Contact angle analysis shown that the values were 74° and 112° (first day) on the hydrophilic and hydrophobic coated samples.
Pengembangan Website Pelayanan Administrasi bagi Masyarakat Kelurahan Sei Enam, Tanjungpinang Habsi, M. Hasbi Sidqi Alajuri; Bonardo, Doli; Harahap, Basyaruddin Ismail
Jurnal Pengabdian Masyarakat Bangsa Vol. 2 No. 12 (2025): Februari
Publisher : Amirul Bangun Bangsa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59837/jpmba.v2i12.2071

Abstract

Perkembangan teknologi informasi dan komunikasi (TIK) telah menjadi elemen penting dalam berbagai sektor, termasuk pendidikan, bisnis, hingga pemerintahan. Di era digital ini, diharapkan proses administrasi dan layanan publik dapat menjadi lebih cepat, efisien, dan terintegrasi. Kelurahan Sei Enam, yang terletak di Kabupaten Bintan, meskipun telah menunjukkan adaptasi yang baik terhadap teknologi, tapi masih menjalankan proses administrasi secara manual, seperti pengurusan surat ahli waris, surat keterangan penghasilan, surat kematian, dan surat keterangan domisili. Selain itu, sistem pengaduan masyarakat belum terintegrasi, sehingga pengelolaan keluhan warga menjadi kurang efisien. Penelitian ini mengusulkan pembuatan website pelayanan administrasi bagi masyarakat Kelurahan Sei Enam. Website dibangun menggunakan metode Rapid Application Development (RAD), sedangkan bahasa pemrograman yang digunakan adalah PHP, JavaScript, dan HTML dengan memanfaatkan framework Laravel dan framework Bootstrap. Pengujian terhadap sistem menggunakan metode blackbox testing. Hasil pengujian menyatakan bahwa website ini dapat berfungsi sesuai dengan spesifikasi dan kebutuhan pengguna, serta mempermudah permintaan surat kapan saja dan di mana saja tanpa harus mengunjungi kantor kelurahan. Keberadaan website ini juga meningkatkan efisiensi, efektivitas, dan transparansi dalam proses administrasi dan pengarsipan.
Design of Time Out Devices for Amateur Volleyball Games Using ESP32 Microcontroller Bonardo, Doli; Kusuma, Hollanda Arief; Hofur, Viki Dima; Yunianto, Anton Hekso
SITEKIN: Jurnal Sains, Teknologi dan Industri Vol 22, No 2 (2025): June 2025
Publisher : Fakultas Sains dan Teknologi Universitas Islam Negeri Sultan Syarif Kasim Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24014/sitekin.v22i2.36169

Abstract

This study presents the development of a wireless time-out device for amateur volleyball games, utilizing ESP32 microcontrollers and ESP-NOW communication. The device aims to improve the efficiency and accuracy of time-out requests, eliminating delays caused by traditional manual signaling. The functional and field tests confirmed that the device enables seamless communication between coaches and referees, ensuring that time-out requests are processed promptly. Performance evaluations included TFT display readability, push button responsiveness, and communication stability over different distances. The TFT screen demonstrated clear visibility at night but faced readability issues under direct sunlight, suggesting the need for brightness optimization. The distance test showed reliable ESP-NOW communication within a 20-100 meter range, with signal degradation and packet loss beyond this threshold. These findings emphasize the importance of optimizing system placement and display readability to enhance usability in various match conditions. This research provides a practical, cost-effective solution for time-out management in volleyball games. Future improvements may include real-time game analytics, mobile app connectivity, and expanded application to other sports. By addressing key challenges in referee-coach communication, this device contributes to the advancement of sports officiating technology.
IMPLEMENTASI IC TIMER 555 PADA SISTEM ELEKTRONIKA DASAR UNTUK APLIKASI KENDALI, INDIKATOR, DAN KEAMANAN Bonardo, Doli; Harahap, Basyaruddin Ismail; Suharlan, Didy; Harahap, Rahmat Kholis
JURNAL REKAYASA ENERGI Vol. 4 No. 1 (2025): Jurnal Rekayasa Energi
Publisher : Politeknik Negeri Indramayu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31884/jre.v4i1.84

Abstract

Within the context of energy-efficient automation, simple electronic control systems remain an essential research area for practical yet low-cost solutions. This study aims to evaluate the functional performance of two circuit prototypes based on the IC Timer 555 a Laser-LDR Security Alarm and a Blinking Turn-Signal Light to address the need for reliable automation in energy engineering applications. The methodology follows a structured three-step approach: (1) circuit simulation using tools such as Multisim or Proteus, (2) physical realization via PCB design and assembly, and (3) functional testing to verify performance metrics of each prototype. Results demonstrate that the security alarm effectively detects laser beam interruption via the LDR in a monostable (latch) configuration, while the turn-signal circuit reliably generates periodic LED blinking using the astable mode. Together, these prototypical systems illustrate how simple timing control circuits using IC 555 can deliver versatile, cost-effective automation suitable for practical applications in energy engineering.
Frequency response-based optimization of PID controllers for enhanced fluid control system performance Frianto, Herri Trisna; Humaidi, Syahrul; Tarigan, Kerista; Ramdan, Dadan; Bonardo, Doli
International Journal of Applied Power Engineering (IJAPE) Vol 14, No 4: December 2025
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijape.v14.i4.pp1058-1070

Abstract

Temperature and viscosity variations are known to affect the performance of proportional-integral-derivative (PID) controllers in fluid systems. However, there exist gaps in research relative to the thermal effects on the performance of PID based fluid systems. PID controllers are also utilized for fluid control to maintain stability and improve performance. This study aims to explore the influence of temperature and viscosity variations through frequency response analysis for the first time in this regard. Utilizing a controlled experimental setup, gain and phase values were measured across different temperature points. Bode and Nyquist plots were generated to observe system behavior, stability, and response to changes in temperature and fluid viscosity. The results show a clear inverse relationship between temperature and gain, with a notable phase lag increase as temperature rises. At 25 °C, the gain was measured at 15.83 dB with a phase of -52.63°, which gradually reduced to a gain of 13 dB and a phase of -61.53° at 80 °C. The Nyquist analysis revealed stable operation within this temperature range, but the shift in response indicates increased system vulnerability as viscosity decreases with rising temperature. The derived linear equations effectively model the gain-phase relationship, with an R² of 0.9985, suggesting a highly accurate fit. Overall, the study concludes that temperature-induced viscosity changes significantly impact PID-controlled fluid systems, emphasizing the need for adaptive control strategies in fluctuating environments.
Construction of A Thermoelectric Coolbox System With Ice Pack Modification for Mango Storage Based on The Internet of Things Fauzan Amri; Ardiansyah Rahma Putra; Moh. Abdul Gofur; Doli Bonardo
Logic : Jurnal Rancang Bangun dan Teknologi Vol. 25 No. 1 (2025): March
Publisher : Unit Publikasi Ilmiah, P3M, Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31940/logic.v25i1.19-26

Abstract

This study aims to design a thermoelectric system for a coolbox utilizing additional ice pack components for mango storage by leveraging a TEC1-12706 Peltier element based on IoT technology. Thermoelectric is an energy conversion technology that directly converts thermal energy into electrical energy and vice versa through thermoelectric materials. The system operates based on the Peltier effect, which generates a temperature difference between two sides of the material when an electric current is applied. Based on the test results, the developed thermoelectric system achieved a cabin temperature of up to 12.6 ºC within 60 minutes, according to the ideal storage temperature requirements for mangoes (12–15 ºC). The addition of an ice pack plays a significant role in accelerating the temperature reduction inside the cabin. The cold sink and heatsink components function effectively in absorbing and releasing heat to the environment. This system achieved a COP of 0.60 with an efficiency of 60%. The thermoelectric system has also been successfully integrated with IoT technology through the Blynk application, enabling users to monitor temperature and humidity in real-time via an internet-connected smartphone, thereby facilitating the control of mango storage conditions.
Design and Implementation of a Solar-Powered Automatic Plant Irrigation System in Kampung Gisi, Bintan Regency, Riau Islands Bonardo, Doli; Alajuri, M. Hasbi Sidqi; Bavitra, Bavitra; Harahap, Basyaruddin Ismail; Afriadi, Arie
Jurnal Pengabdian kepada Masyarakat (Indonesian Journal of Community Engagement) Vol 11, No 4 (2025): December
Publisher : Direktorat Pengabdian kepada Masyarakat Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jpkm.104333

Abstract

Agricultural sustainability is essential for rural communities, particularly in Kampung Gisi, where celery cultivation is a major source of household income. However, farmers continue to rely on manual irrigation, which is labor intensive, time consuming, and often inefficient in terms of water use. This study aimed to design and implement a solar powered automatic irrigation system that improves water efficiency while reducing farmers’ workload. The approach addressed these challenges by developing an autonomous system powered by solar energy and guided by soil moisture sensing to optimize water delivery. The proposed system integrates a solar panel, an ESP32 microcontroller, a soil moisture sensor, a relay module, and a DC pump to enable irrigation decisions based on real time soil moisture data. Implementation and testing were conducted in Kampung Gisi, Bintan Regency, Riau Islands. Data collection included site visits and semi structured interviews with local farmers to document existing irrigation practices and constraints. Field trials indicated that the system effectively automated irrigation, and the results showed an approximately 30% reduction in water use compared with manual watering. Prior to deployment, farmers typically spent several hours per day irrigating, whereas the automated system substantially reduced time requirements, allowing farmers to allocate effort to other farm activities. Farmers also reported more stable soil moisture conditions, which supported healthier crop development and improved yields. Overall, the findings demonstrate that the system can enhance irrigation efficiency, reduce labor demands, and support more sustainable agricultural practices. Community participation was critical, as farmers developed technical familiarity and a sense of ownership, which supports long term system viability. These results underscore the role of appropriate technology in strengthening farming communities, and they suggest that future work should prioritize accessibility and scalability to support broader adoption.
Co-Authors Alajuri, M Hasbi Sidqi Amri, Fauzan Anton Hekso Yunianto Ardiansyah Rahma Putra Arie Afriadi Basyaruddin Islmail Harahap Basyaruddin Ismail Harahap Basyaruddin Ismail Harahap Bavitra, Bavitra Berkadh Simanjuntak Bimbi Aditya Wanatirta BIMBI ADYTIA WANATIRTA Dadan Ramdan Fauzan Amri Harahap, Basyaruddin Ismail Harahap, Rahmat Kholis Henry Munandar Manik Herri Trisna Frianto Herri Trisna Frianto, Herri Trisna Hofur, Viki Dima Hollanda Arief Kusuma Karya Sinulingga Kerista Tarigan Marhaposan Situmorang Marisha Pertiwi Marzuki Sinambela Moh. Abdul Gofur Muhammad Tanveer Muhammad Zainuddin Lubis Rahmat Kholis Harahap Raptama Siburian RozeffPramana Septia Refly Septia Refly Suharlan, Didy Suhengki Syahrul Humaidi Syahrul Humaidi, Syahrul Tarigan, Kerista WANATIRTA, BIMBI ADYTIA