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All Journal SIPIL International Journal of Recent Technology and Applied Science (IJORTAS) International Journal Of Computer, Network Security and Information System (IJCONSIST) Sinnun Maxillofacial Journal Bureaucracy Journal : Indonesia Journal of Law and Social-Political Governance Jurnal 7 Samudra Politeknik Pelayaran Surabaya Asian Journal of Social and Humanities
Hendra Purnomo, Hendra
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Biochemistry, Genetics & Molecular Biology Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Dentistry Earth & Planetary Sciences Education Electrical & Electronics Engineering Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Medicine & Pharmacology Public Health Transportation

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PEMANFAATAN SERBUK KACA SEBAGAI SUBSTITUSI PARSIAL SEMEN PADA CAMPURAN BETON DITINJAU DARI KEKUATAN TEKAN DAN KEKUATAN TARIK BELAH BETON Purnomo, Hendra; Hisyam, Endang Setyawati
SIPIL Vol 2, No 1 (2014)
Publisher : SIPIL

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (5.683 KB)

Abstract

Pemanfaatan serbuk kaca merupakan alternatif yang dapat digunakan sebagai substitusiparsial semen dalam campuran beton karena unsur kimia yang terkandung dalam serbukkaca hampir sama dengan unsur kimia yang terdapat dalam semen. Penelitian tentangpemakaian serbuk kaca sebagai substitusi parsial semen menggunakan beberapapersentase yaitu 0%, 2.5%, 5%, 7.5%, 10%, 12.5% dan 15%, dengan umur beton28 hari. Dari masing - masing campuran beton tersebut dibuat tiga benda uji. Pengujianyang dilakukan pada campuran beton adalah kuat tekan dan kuat tarik belah beton denganmenggunakan alat uji tekan beton (Universal Testing Machine). Dari hasil penelitiandiperoleh, kuat tekan beton dengan penambahan serbuk kaca 0% sebesar 23,20 MPa,2,5% sebesar 20,28 MPa, 5% sebesar 20,37 MPa, 7,5% sebesar 20,56 MPa, 10% sebesar21,41 MPa, 12,5% sebesar 18,49 MPa dan 15% sebesar 16,69 MPa. Sedangkan Kuattarik belah beton penambahan serbuk kaca pada persentase 0% didapat hasil sebesar2,55 MPa, 2,5% sebesar 2,69 MPa, 5% sebesar 2,62 MPa, 7,5% sebesar 2,45 MPa,10% sebesar 2,78 MPa, 12,5% sebesar 2,43 MPa dan 15% sebesar 2,19 MPa.Kata Kunci: beton, semen, serbuk, kaca, kuat tarik dan kuat tekan.
Peningkatan Stabilitas Dimensi Hasil Cetakan Alginat Dengan Penambahan Pati Ubi Kayu dan Pati Sagu Syam, Syamsiah; Anas, Risnayanti; Abdi, Muhammad Jayadi; Biba, Andi Tenri; Chotimah, Chusnul; Purnomo, Hendra
Sinnun Maxillofacial Journal Vol. 2 No. 01 (2020): April 2020
Publisher : Fakultas Kedokteran Gigi Universitas Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1000.175 KB) | DOI: 10.33096/smj.v2i01.49

Abstract

Pendahuluan: Alginat adalah bahan cetakan yang sering digunakan dalam kedokteran gigi. Bahan cetak alginat masih memiliki kelemahan dalam akurasi stabilitas dimensi, dimana alginat memiliki stabilitas dimensi yang cepat berubah. Tujuan Penelitian: Peneltian ini untuk mengetahui pengaruh penambahan pati ubi kayu dan pati sagu terhadap stabilitas dimensi hasil cetakan alginat. Bahan dan Metode: Penelitian ini menggunakan metode True Eksperimental Laboratorium dengan rancangan cross-sectional. Dimana jumlah sampel minimal diestimasikan berdasarkan rumus Federer. Penelitian ini dilakukan di laboratorium terpadu Fakultas Kedokteran Gigi Universitas Muslim Indonesia. Hasil: Telah didapatkan berdasarkan uji one way anova diperoleh p-value sebesar 0,000 (p<0,05). Berdasarkan uji post hoc multiple comparison diperoleh perbedaan rata-rata antara pati ubi kayu ditambah alginat dengan kelompok kontrol sebesar 0,35500. Sedangkan untuk pati sagu ditambah alginat dengan kelompok kontrol sebesar 0,75500. Kesimpulan: Pada penelitian ini terdapat perubahan yang signifikan antara penambahan pati ubi kayu dan pati sagu terhadap stabilitas dimensi hasil cetakan alginat.
Pengembangan Trainer Instrumentasi Alarm dan Sistem Monitoring untuk Pembelajaran Program Diploma IV Teknologi Rekayasa Permesinan Kapal Politeknik Pelayaran Surabaya Irfan, Saiful; Purnomo, Hendra; Setiawan, Dedi
Jurnal 7 Samudra Vol. 6 No. 1 (2021): Jurnal 7 Samudra
Publisher : PPPM - POLITEKNIK PELAYARAN SURABAYA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54992/7samudra.v6i1.81

Abstract

Rencana penelitian ini merupakan penelitian Research and Development (R&D) dalam Penelitian ini merupakan penelitian Research and Development (R&D) dalam bidang pendidikan. Model penelitian pengembangan yang digunakan berupa ADDIE: Analysis, Design, Development, Implementation, Evaluation. Instrumen yang digunakan pada penelitian ini berupa angket dengan skala likert empat jawaban. Uji validitas instrumen dilakukan dengan mengadakan konsultasi dengan ahli materi dan ahli media. Reliabilitas instrumen dihitung menggunakan rumus alpha dan menghasilkan nilai reliabilitas sebesar 0,89(sangat reliabel). Terdapat tiga aspek yang diukur pada tahap implementasi ini, yaitu aspek kualitas materi, pengoperasian media, dan aspek pembelajaran. Hasil yang diperoleh yaitu untuk kualitas materi mendapatkan persentase 77,87%, untuk pengoperasian media mendapatkan 69,12%, dan untuk pembelajaran mendapatkan persentase sebesar 75,24%. Dari ketiga persentase tersebut didapatkan persentase total sebesar 75,24%, sehingga media trainer sensor dinyatakan “LAYAK” digunakan sebagai media pembelajaran mata kuliah sistem kontrol di Politeknik Pelayaran Surabaya pada program Diploma IV Teknologi Rekayasa Permesinan Kapal Politeknik Pelayaran Surabaya
PENGEMBANGAN APLIKASI PERHITUNGAN BAHAN BAKAR UNTUK OPERASIONAL KAPAL BERBASIS ANDROID Retno Gunarti, Monika; Dwi Suharso, Didik; Purnomo, Hendra; Zainudin, Muhamad; Esayadi, Alvin
Jurnal 7 Samudra Vol. 6 No. 2 (2021): Jurnal 7 Samudra
Publisher : PPPM - POLITEKNIK PELAYARAN SURABAYA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54992/7samudra.v6i2.83

Abstract

Penelitian ini bertujuan untuk mengembangkan aplikasi berbasis android untuk menghitung jumlah bahan bakar disesuaikan dengan jarak tempuh dan kecepatan kapal berdasarkan lintasan yang dilalui (way point). Perhitungan jarak dalam pengembangan aplikasi menggunakan metode sperichal triangle yang digunakan dalam navigasi pelayaran. Pengembangan aplikasi ini mengadopsi model waterfall dengan tahapan Requirement Engineering (Analisis kebutuhan), design and implementation (desain dan implementasi), Testing (Pengujian dan integrasi), Release (hasil akhir dan pelepasan produk) dan Maintenance (perawatan). Review produk pengembangan melibatkan ahli perangkat lunak untuk memberikan kritik dan saran. Pengembangan ini diuji dengan perhitungan manual dan dibandingkan dengan ECDIS (electronic Chart Display Information System). Hasil pengujian menunjukkan tidak ada perbedaan yang signifikan antara hasil perhitungan menggunakan aplikasi dengan perhitungan manual maupun ECDIS, karena perhitungan jarak dan bahan bakar memiliki selisih yang sangat kecil.
Design and Performance Testing of Seawater Batteries as Renewable Energy for Marine Boat Lights Anwar, Dedtri; Papia, Jedithjah Naapia Tamedi; Purnomo, Hendra; Darmawan, Putu Deny
International Journal of Recent Technology and Applied Science (IJORTAS) Vol 7 No 1: March 2025
Publisher : Lamintang Education and Training Centre, in collaboration with the International Association of Educators, Scientists, Technologists, and Engineers (IA-ESTE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36079/lamintang.ijortas-0701.773

Abstract

Indonesian seas offer abundant renewable energy potential. Seawater batteries have attractive advantages as a source of electrical energy. The purpose of this study was to design and manufacture a seawater battery and test its performance for ship lighting. The methodology used includes designing and manufacturing a seawater battery storage container based on electrode dimensions, assembling electrodes and insulators, and testing battery performance using LED lights. The results showed that the design produced an 8-cell seawater battery with a height of 24 cm and a diameter of 17.78 cm (7 inches). Performance testing with a 7 W LED lamp for 60 minutes showed that higher salt content caused an increase in the average light intensity produced. In 8 W and 10 W LED lamps, it is known that an increase in the average light intensity produced only occurs at an increase in salt content of 3 to 4%, while an increase in the average light intensity at a salt content of 5% does not occur, iii) average salt content -an average of 4% on a seawater battery with a 60 minute test for a 7W LED lamp produces an average light intensity of 227.33 lumens, for an 8W LED lamp an average of 325 lumens, and for a 10W LED lamp an average of 604, 67 lumens. The greater the power of the LED lamp used, the greater the light intensity produced.
EVALUATION OF THE PERFORMANCE AND EFFICIENCY OF ALTERNATIVE PROPULSION SYSTEMS FOR SMALL NAVAL VESSELS IN TROPICAL MARINE ENVIRONMENTS Alamsyah, Jaya; Jamaan, Aris; Palapa, Arika; Purnomo, Hendra; C. Budiman, Jeihn Novita
Bureaucracy Journal : Indonesia Journal of Law and Social-Political Governance Vol. 5 No. 1 (2025): Bureaucracy Journal : Indonesia Journal of Law and Social-Political Governance
Publisher : Gapenas Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.53363/bureau.v5i1.562

Abstract

Background: The maritime industry is shifting towards sustainable propulsion technologies due to rising fuel costs, stringent environmental regulations, and the need for energy-efficient naval operations. Traditional diesel-powered naval vessels face operational inefficiencies and high emissions, particularly in tropical marine environments where heat and salinity impact propulsion system performance. This study evaluates the feasibility and efficiency of hybrid and electric propulsion systems for small naval vessels, considering their performance under extreme environmental conditions. Original Value: Unlike previous studies that focus on alternative propulsion in commercial vessels, this research specifically analyzes naval applications in tropical environments, addressing operational feasibility, environmental sustainability, and economic implications. Objectives: This study seeks to answer: How do hybrid and electric propulsion systems compare to traditional diesel engines in efficiency, cost-effectiveness, and environmental impact in tropical waters? Methodology: A qualitative-empirical approach was employed, integrating sensor-based propulsion performance monitoring, expert interviews, and cost-benefit analysis to evaluate fuel efficiency, emission reduction, and long-term maintenance costs. Results: The findings indicate that hybrid and electric propulsion systems significantly reduce fuel consumption (89/100), lower operational costs (91/100), and cut emissions (94/100). However, battery efficiency in high temperatures (85/100) and infrastructure readiness remain challenges. Conclusions: Hybrid propulsion emerges as the most practical solution for naval modernization, offering a balance between efficiency and cost-effectiveness, while fully electric propulsion is best suited for short-range operations.
Battery Power Control and Monitoring System with Internet of Things Technology Slamet Winardi; Dwi Suharso, Didik; Purnomo, Hendra; Budijanto, Arief
IJCONSIST JOURNALS Vol 3 No 1 (2021): September
Publisher : International Journal of Computer, Network Security and Information System

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (597.249 KB) | DOI: 10.33005/ijconsist.v3i1.56

Abstract

Along with the development of battery/ACCU technology, the ACCU charging and loading system has also developed manually or automatically. In this paper, the results of research on the manufacture of tools that function to monitor and control the charging and loading of electrical power will be explained from batteries that are burdened with lights and DC motors through a control panel or android smart phone with IoT technology. This tool is designed to monitor 2 ACCUs, namely ACCU1 and ACCU2. ACCU1 is loaded with lamp and parallel with DC motor load while ACCU2 is loaded with DC motor and parallel with lamp load. If ACCU1 and ACCU2 are full, ACCU1 is loaded with only one lamp and ACCU2 is only loaded with DC motor. For example, ACCU1's electrical power is still within the limits that can be loaded with lights and DC motors while ACCU2 can't be loaded because electric power is not capable of being loaded with DC motors, the DC motor's load will be transferred to ACCU1. So that ACCU1 is loaded with DC lamps and motors and ACCU2 is charging the electricity, as well as for the opposite condition. The design of this tool uses the main component of the ESP32 microcontroller, where this component has been integrated with the wifi module and other supporting circuit modules, namely the current sensor circuit, voltage sensor and OLED display. The software design consists of a program code designer for hardware using C++ and an android smart phone application design using MIT App Inventor. The results of this study are in accordance with the design specifications, namely the device can be used to control charging and loading as well as monitor ACCU1 and ACCU2 electrical power on OLED screens and on Android smart phones screens
The Urgency of Developing a Crewing Management System (CMS) for PT MCS Internasional in the Era of Maritime Digitalization Purnaningratri, Indah; Setiawan, Raden Novi Andri; Widhianingsih, Endah Nur; Purnomo, Hendra; Magdalena, Susiarni
Asian Journal of Social and Humanities Vol. 4 No. 2 (2025): Asian Journal of Social and Humanities
Publisher : Pelopor Publikasi Akademika

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59888/3n7n4h62

Abstract

The maritime industry is undergoing a rapid digital transformation that is reshaping traditional operations and human resource management. PT MCS Internasional, a large-scale maritime service provider managing crew operations for multiple types of vessels and companies, faces challenges in data management, efficiency, and compliance monitoring. The complexity of handling numerous crew members and diverse client requirements demands a structured digital solution. This research aims to examine the necessity and urgency of developing a Crewing Management System (CMS) tailored to PT MCS Internasional’s operational framework. Using a qualitative descriptive method through interviews, observation, and document analysis, the study finds that the manual and semi-digital processes currently in use result in data duplication, low accuracy, and slow decision-making. Customized CMS is essential to streamline operations, integrate multiple data sources, ensure regulatory compliance, and improve competitiveness. The paper concludes that implementing a comprehensive CMS will serve as a strategic move to enhance efficiency, reliability, and scalability in managing maritime human resources.
Co-Authors Abdi, Muhammad Jayadi Alamsyah, Jaya Anas, Risnayanti Andi Tenri Biba Mallombasang Anwar, Dedtri Arika Palapa Budijanto, Arief C. Budiman, Jeihn Novita Darmawan, Putu Deny Dedi Setiawan Dwi Suharso, Didik Endang Setyawati Hisyam, Endang Setyawati Esayadi, Alvin Irfan, Saiful Jamaan, Aris Jedithjah Naapia Tamedi Papia Muhamad Zainudin Purnaningratri, Indah Retno Gunarti, Monika Setiawan, Raden Novi Andri Slamet Winardi Susiarni Magdalena Syamsiah Syam, Syamsiah Widhianingsih, Endah Nur Wiwik Handayani