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All Journal SITEKIN: Jurnal Sains, Teknologi dan Industri Eksakta : Berkala Ilmiah Bidang MIPA Prisma Sains: Jurnal Pengkajian Ilmu dan Pembelajaran Matematika dan IPA IKIP Mataram EINSTEIN (E-JOURNAL) Jurnal Pengabdian Masyarakat Bangsa
Doli Bonardo
Department Of Electrical Engineering, Faculty Of Maritime Engineering And Technology, Universitas Maritim Raja Ali Haji, Tanjungpinang, Indonesia
Agriculture, Biological Sciences & Forestry Arts Humanities Astronomy 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.
Co-Authors Alajuri, M Hasbi Sidqi Amri, Fauzan Anton Hekso Yunianto Berkadh Simanjuntak Dharma, Budi Harahap, Basyaruddin Ismail Hofur, Viki Dima Hollanda Arief Kusuma Karya Sinulingga Marhaposan Situmorang Marzuki Sinambela Muhammad Tanveer Raptama Siburian