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All Journal Marine Fisheries: Jurnal Teknologi dan Manajemen Perikanan Laut KAPAL Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Jurnal Teknik ITS Jurnal Pendidikan Teknik Mesin International Journal of Marine Engineering Innovation and Research Jurnal Pendidikan Syura: Journal of Law
Achmad Baidowi, Achmad
Institut Teknologi Sepuluh Nopember
Religion Humanities Automotive Engineering Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Physics Transportation Other

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Penggunaan Media Animasi Interaktif Dalam Membantu Pemahaman Siswa Pada Mata Pelajaran PAI di SMK An Nur Omben Jamal, Nur; Baidowi, Achmad
AL -ALLAM Vol. 5 No. 1 (2024): JANUARI
Publisher : LP2M Institut Agama Islam Nazhatut Thullab Sampang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35127/jurnalpendidikan.v5i1.7668

Abstract

In learning, teachers are not enough to just convey knowledge. However, they must also be able to raise the level of students' thinking from previous knowledge to the next level, namely understanding, so that the process of achieving learning objectives is more optimal. Therefore, teachers must be able to determine the best media to be used. Accuracy in the use of learning media greatly determines the creation of conducive and enjoyable conditions so as to provide opportunities for students to be more active in obtaining convenience in learning the subject matter presented by the teacher. This study aims to analyze the use of interactive animation media in helping students' understanding of Islamic Religious Education (PAI). With the rapid development of technology, interactive animation-based learning media are expected to help students' understanding. The focus of this study covers two aspects, namely: First, How is the Use of Interactive Animation Media in Helping Students' Understanding of PAI Subjects at SMK AN NUR OMBEN?. Second, What are the supporting and inhibiting factors for the Use of Interactive Animation Media in Helping Students' Understanding of PAI Subjects at SMK AN NUR OMBEN. This study uses a descriptive qualitative method. The data sources obtained were through interviews, observations and documentation, the informants were the principal of SMK AN NUR OMBEN, Deputy Curriculum, Islamic Religious Education Teachers, and Students of SMK AN NUR OMBEN.
Quantitative Analysis of Macro Foam Integration in Non Pressurized Manned Submersibles (NPMS): A Comprehensive Study of Buoyancy Management and Operational Performance Zulfakhri, Ahlan; Baidowi, Achmad; Sunarsih, Sunarsih
Kapal: Jurnal Ilmu Pengetahuan dan Teknologi Kelautan Vol 23, No 1 (2026): Article in Press
Publisher : Department of Naval Architecture - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/kapal.v22i3.78858

Abstract

Non-pressurized manned submersibles continue to struggle with fundamental limitations in buoyancy control and energy management, while traditional ballast systems present considerable challenges when operational demands increase, making macro foam technology an intriguing alternative that could address these persistent issues through passive buoyancy enhancement. This study quantitatively evaluates the impact of macro foam integration on NPMS operational parameters by comparing configurations with and without macro foam across multiple performance metrics using actual technical specifications through comprehensive computational analysis examining vehicle mass, buoyancy characteristics, ballast tank specifications, and operational efficiency across four distinct ballast configurations (neutral, forward full, center full, aft full), with performance metrics evaluated using standardized naval engineering protocols based on actual submersible design data. Macro foam integration demonstrated significant improvements across all measured parameters, with tank volume requirements decreasing by 64.4% (from 1466.43L to 521.53L), buoyancy deficit decreasing by 60.7% (from 1.35 to 0.53 tons), total buoyancy increasing by 175% (from 0.65 to 1.79 tons), and ballast requirements reducing by 43.6-60.7% across all configurations, while safety margins improved dramatically with a 3.4:1 emergency buoyancy ratio compared to 0.5:1 without foam. These findings demonstrate that macro foam integration provides fundamental improvements in NPMS operational capability, safety margins, and energy efficiency, with the technology transitioning from optional enhancement to essential operational requirement for practical submersible deployment in modern naval operations.
Comparative Analysis of Space-Based Battery, Fuel Cell, and Conventional Propulsion System for General Cargo Ships Of Approximately 100 Meters Axel Rafoth; Achmad Baidowi; Quito Abian Iqtarib
International Journal of Marine Engineering Innovation and Research Vol. 9 No. 3 (2024)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v9i3.4915

Abstract

This research aims to serve as a guidebook or framework for designing a general cargo ship, approximately 100 meters in length, by replacing the conventional diesel system with hydrogen and fuel cell technology. The reference vessel for this study is the general cargo ship with about 100m length operated in Baltic Sea. The results of this research provide the foundational calculations for designing a ship powered by hydrogen fuel cells, including the selection of hydrogen type, battery choice, and compliance with class standards. Additionally, the transformation of the ship's layout is a key outcome of this study. Based on the calculations, the ship, with a sailing duration of approximately three days, requires around 2800 kg of liquid hydrogen. This hydrogen supply can support 4 x 200 kW fuel cells and 5 x 70 kWh batteries. Ultimately, this allows for the design of a hydrogen-powered ship with an endurance of three days.
Analysis Of Magnus Effect Toward The Shaft Of Vetical Axis Hydro Turbine H-Darrieus Irfan Syarief Arief; Amiadji; I Putu Gedhe Adhi Darsana; Achmad Baidowi
International Journal of Marine Engineering Innovation and Research Vol. 8 No. 4 (2023)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v8i4.5091

Abstract

One way to fight climate change is making a transition from fossil fuel powered energy into renewable energy. In Indonesia the government have the national energy mix prediction which state that in 2050 58% Indonesian energy source will be renewable. The biggest source of renewable energy in Indonesia come from marine source. One sources of marine energy are tidal currents that can be harness by using hydrokinetic turbine. The goal to be solved is to determine the effect of magus force toward the turbin shaft. Shaft rotation speed and fluid velocity will be determined as the variation. The method used is computational fluid dynamic using fine marine numeca software to determine magnus force magnitude and mdsolids software to calculate the maximum bending moment after the magnus force applied. The results is magnus force just increase the minimum required diameter of turbine shaft by 0.26% and the corresponding safety factor is 1.889 more than 1.0 thus there is no need to replace or strengthen the existing turbine shaft.
Flettner Rotor Modification through Adding Ridges and Fins with Results Comparison to Base Model Nowar Deeb; Achmad Baidowi; Adi Kurniawan
International Journal of Marine Engineering Innovation and Research Vol. 8 No. 2 (2023)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v8i2.5199

Abstract

Oceans are the most crucial factor in maintaining global environmental equilibrium. Researchers are looking into the possibility of capturing wind power for shipping. Ship builders and owners provide several solutions based on the use of electrical power, low-polluting fuels, solar energy, and wind energy. The goal of this research is to learn more about using Flettner rotors as alternate sources of power and to create a new operational model for the rotor that could generate more power output from the currently available base model. Due to the sluggish market and glut of tonnage, the global shipping industry is now having difficulties. Only a few ships have wind-assisted technologies to help them save money on fuel. For the research, we created a base model in the 3D program from the available data about the commercially used Flettner rotor, then we modified a number of variations for the model and compared the results we reached from the CFD software to find an outcome that is better than the current output of the base model, and the results have shown improvement for the lower wind speeds.
Impact Analysis of Trim Tab Inclination Angles Variation to Propulsion Power Requirement of 6 Meter’s Speed Boat Amiadji; Achmad Baidowi; Aufal Nanda Oktova
International Journal of Marine Engineering Innovation and Research Vol. 6 No. 3 (2021)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v6i3.5841

Abstract

Determining the ship's propulsion power requirements is one of the most crucial things in ship design which is related to the ship's resistance. One of the causes of the high value of a ship's resistance is excessive trim of the ship. Therefore it needs a mechanism to overcome this, it can be by applying trim tabs. The trim tab is a small surface mounted on the ship's transom that can be adjusted according to the conditions of the ship. By adjusting the angle of the trim tab to be larger, it can increase the lift force and torque moment at the stern of the ship which can reduce the trim of the ship. Based on the boat’s characteristics, referring to the guide from Bennet Marine, the appropriate trim tab’s geometry for this boat is a trim tab with a span width of 18” (46 cm) and a chord length of 9” (23 cm). After selecting the trim tab geometry, then analyzing the resistance and trim of the ship using the CFD method. Through CFD simulation, trim tab with an angle of 15° can reduce the value of the ship's resistance to 17.25% and for the trim can be reduced to 46.72%. Then after the ship's propulsion power requirements calculation, it is shown that the trim tab with an angle of 15°, a reduction of 11.56% is obtained from 78.854 kW to 69.741 kW.
Thrust and Torque Analysis on Propeller C4-40 with The Addition of Kort Nozzle to Pitch Variation Irfan Syarief Arief; Achmad Baidowi; Maria Ulfa
International Journal of Marine Engineering Innovation and Research Vol. 6 No. 3 (2021)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v6i3.5842

Abstract

At this time there are various types of propellers, one of which is the CPP propeller (Controllable pitch propeller). The CPP propeller can change pitch angles, and at certain pitches it can pull the ship backwards without having to change the rotation. But keep in mind that the CPP has only one pitch design where changing the pitch position means reducing the efficiency of the propeller. So it takes a kort nozzle to increase efficiency. The addition of a kort nozzle is one of the developments of an Energy Saving Device (ESD) which in addition to increasing efficiency it is also able to increase the thrust. Problem formulation of this research is to find out changes in thrust, torque and efficiency on the propeller CPP C4-40 after the addition of kort nozzle 37. This research begins with determining the dimensions of the propeller, also the types and dimensions of the nozzle. Then the design and drawing of the propeller C4-40 with a kort nozzle 37 was carried out for pitch changes of 0°, 22.5° and 45°. The next step is a meshing process where each pitch the number of meshing ranges from 2.3 to 3.5 million cells. The last step is to simulate the performance of the propeller with the nozzle using software based on Computational Fluid Dynamic. From this research, it can be concluded that the addition of kort nozzle 37 on the propeller C4-40 changes the thrust, torque and efficiency values significantly. Thrust only increased at pitch 0° J 1.4 and pitch 22.5°. The greatest increase in thrust at pitch 22.5° J 0.6 is 88.74%. Torque is reduced except for pitch 0° J 0.8-1.4. The biggest decrease in torque at pitch 45° J 1.2 is 83%. Meanwhile efficiency has decreased at all pitch angles. Where the biggest decrease in pitch 45° J 1 is 99.83%.
Analysis of the Effects from Adding Propeller Boss Cap Fins to Skewed Propeller Performance With CFD Methods Irfan Syarief Arief; Achmad Baidowi; Anson Novendra Pradana
International Journal of Marine Engineering Innovation and Research Vol. 6 No. 2 (2021)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v6i2.5850

Abstract

Fuel accounts for the majority of the ship's operating costs. Increased propeller efficiency can help to reduce fuel usage. The higher the efficiency, the less energy is wasted. Ships with high propeller efficiency may be able to provide more thrust while using less fuel. Propeller Boss Cap Fin (PBCF) installation is one of the solutions for improving propeller efficiency that is ideal for a submarine. PBCF may lower the submarine's energy usage, allowing it to recharge its batteries less frequently. According to certain studies, PBCF can boost propeller efficiency by 7% while lowering noise levels by nearly 6 decibels (dB). The impact of PBCF phase lag variation on skewed propeller performance and flow will be the subject of this article. CFD simulation using phase lags of 0, 12.86, 25.72, and 38.58 will be used in the study. The simulation shows that PBCF can improve propeller efficiency while lowering propeller torque. Even though all phase lag modifications show a reduction in propeller thrust. On its hub vortex, they also reveal the existence of distraction.
Analysis of the Effect of Sloshing on Damage Stability after the Addition of LNG Tanks Agoes Santoso; Achmad Baidowi; Mardisuin Siahaan
International Journal of Marine Engineering Innovation and Research Vol. 5 No. 3 (2020)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v5i3.5997

Abstract

The Damage Stability, better known as leaky ship stability, is a condition where the vessel has a leak in the ship's compartment so that the stability condition of the ship is disrupted. This study is a study of the effects caused by sloshing on the stability of the ship. The method used to calculate damage stability is the lost buoyancy method. This method assumes a condition where when the vessel has a leak, the vessel buoyancy will decrease. This happens because the empty space in the vessel will be filled with water, so it is no longer the part that contributes to the buoyancy so that the ship will increase and can result in sinkage. According to the calculation of SOLAS (Safety of Life at Sea) Consolidated Edition 2014 Chapter II-1 Part B-1. There are two indexes compared, namely index Required index R = 0.77172, which depends on the length of the lining and Attained subdivision index A = 0.83736. The pi factor shows a maximum of 5 leak zones that can be overcome by the ship to remain stable. By comparing the index value of A> R, it can be seen that this ship has fulfilled the SOLAS requirements.
Motion Response Analysis of Hexagonal Pontoon Wave Energy Converter Irfan Arief Syarief; Achmad Baidowi; Azzahra Nirwana Islami
International Journal of Marine Engineering Innovation and Research Vol. 5 No. 2 (2020)
Publisher : Department of Marine Engineering, Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j25481479.v5i2.6006

Abstract

The wave energy conversion system is one of the technology innovative used in the researches of alternative power plant at sea. It receives environmental loads such as wave, wind, and current during its operation. In order to be able to rotate the pendulum and produce electricity, it is designed with a hexagonal shaped ponton with three floaters on its sides to increase the rotational motion of the ponton. These floaters are connected to the ponton by an arm, identically distance from one another. Mooring system used in this research is designed to allow it to still move and rotate the pendulum while keeping the platform from capsizing. This research is discussing about the difference of motion response between three variations of wave energy conversion system designs, Variation 1 that is designed with floaters, Variation 2 with shortened floater arms, and Variation 3 which have no floaters, by comparing their RAOs (Response Amplitude Operator), to figure out which design is the most responsive when collinear load from heading 0o, 30o, 60o, 90o, and 120o is acting on it. This research reveals that model Variation 1 is the most optimal because it has relatively higher values of RAOs, and the motion response of the ponton is still apparent after mooring system is installed. The highest RAO in free floating condition for 6 degree of freedom surge, sway, heave, pitch, roll, and yaw are 1,949 m/m frequency 0,1 Rad/s heading 0o, 1,6 m/m frequency 1,7 Rad/s heading 60o, 0,998 m/m frequency 0,1 Rad/s heading 0o, 22,13 Deg/m frequency 1,8 Rad/s heading 60o, 21,7 Deg/m frequency 2 Rad/s heading 0o, and 77,212 deg/m frequency 1,8 deg/m heading 0oconsecutively. The furthest excursion is at 5,1 meters along x-axis 0o load, while the shortest excursion is 1,5 meters along y-axis 120o load. The highest Roll motion reached 62,5o along the x-axis 90o load while pitch motion reached 15,5o along y-axis 120o load.
Co-Authors Achdri Fauzi Nugraha Oloan Achmad Ishlahul Fanany Adi Kurniawan Adi Kurniawan Agoes Santoso Agoes Santoso Ahmadi Munib Amam Baharullah Amiadji Amiadji Amiadji Anson Novendra Pradana Anson Novendra Pradana Ari Budi Setiawan Ari Kuncoro Ari Setiawan Aufal Nanda Oktova Axel Rafoth Azzahra Nirwana Islami Brenda M. Samiadji DEWANTO Dian Purnamasari Dian Purnamasari Eddy Setyo Koenhardono, Eddy Setyo Edi Jadmiko Eko Sulkhani Yulianto Ericson Posmanov Martua Silalahi Fariz Maulana Noor Fitricia Putri Ricinzky Fitricia Putri Rizki Ricinsi Hesty A Kurniawati, Hesty A I Putu Gedhe Adhi Darsana Indiaryanto, Mahendra Irfan Arief Syarief Irfan Syarief Arief Irfan Syarief Arief Irfan Syarief Arief Irfan Syarief Arief Irfan Syarif Arief Jamal, Nur Lintang Candra lintang, lintang candra Mardisuin Siahaan Maria Ulfa Maria Ulfa Muhammad Badrus Zaman Muhammad Badrus Zaman Muryadin Muryadin Muryadin, Muryadin Muttaqie, Teguh Nanang Setiyobudi Nanda Oktova, Aufal Noor, Fariz Nowar Deeb Nowar Deeb Prihandanu, Riyan Bagus Quito Abian Iqtarib Rakhim, Maulana Rezvani, Rifki riyan prayogo Rosyada, Amron Setiyobudi, Nanang Sunardi, Sunardi Sunarsih Sunarsih Sunarsih Sutopo Purwono Fitri Teguh Muttaqie Tony Bambang Musriyadi Wasis D Aryawan, Wasis D Wijaya Kusuma Rahadi, Cakra Wijaya, Rifqi Al Baihaqi Zarochman Zarochman Zarochman, Zarochman Zulfakhri, Ahlan