2026-07-13T09:58:08+03:30 http://ijmt.ir/browse.php?mag_id=45&slc_lang=en&sid=1

45-824 2026-07-13 10.1002

International Journal of Maritime Technology ijmt 2345-6000 2476-5333 10.66224/ijmt 2024 19 Yasamin Hasani Asyabdareh yhasaniasiyabdareh139@gmail.com Mohammad Moonesun m.moonesun@gmail.com Mehdi Adjami mahdi.adjami@gmail.com Countries that produce products and consumers are the determining factors in important commercial shipping routes in the world. In the 20th century, Europe and America produced as agents and Asia as consumers, but this is not the case since the new beginning. The increase in population, the growth of the GDP index, and the wealth and technology of Asian societies can be seen. Also, due to the increase in population, Western companies have turned to Asia for more profit and to benefit from cheap skilled labor. In this article, we have introduced important shipping points in the world. Then, by studying the statistics of the past decades, examining the current situation and future forecasts, we came to the conclusion that the world's most important commercial shipping routes in the coming years are not only from the West and Europe to Asia. Asia is to these countries and even from Asia to Asia. world's transit routes transit chokepoint increasing population in Asia the future of the world Decline of the West 2024 1 01 1 13 http://ijmt.ir/article-1-824-en.pdf 10.61186/ijmt.19.1

45-815 2026-07-13 10.1002

International Journal of Maritime Technology ijmt 2345-6000 2476-5333 10.66224/ijmt 2024 19 Amir Nezam Barti nezambarti@gmail.com Arya Shafaghat Rodsari aryaroodsar48@gmail.com Abutaleb Motalebi abu.m56@yahoo.com More than 90% of the world’s trade is done by merchant ship lines and their security is very important. Piracy is term used to describe violent acts carried out by terrorists and pirates at sea. Intelligence analysts, law enforcement officials, and policymakers have become increasingly concerned about the possibility of future maritime pirate's attacks. This study uses an analytical–descriptive approach to analyze the Study of Piracy from the Perspective of International Regulations and Their Impact on Trade and Transport. The findings of this study show that Piracy is one of the most important threats to international trade and maritime transport security. The maritime environment possesses some unique characteristics, including the extraterritoriality of the high seas and poor or inconsistent security measures that apply in ships and coastal areas and facilities could make them attractive to pirate operations in many parts of the world. Therefore, to have an efficient and effective fight against piracy based on the rule of law, the most important international sources to study the challenges against piracy are the 1982 United Nations Convention on the Law of the Sea, the Security Council Approvals, and IMO regulations. Although the approval of national laws of countries can bring transparency and efficiency in the fight against the phenomenon of piracy. Finally, Regional cooperation among States has an important role to play in solving the problem of piracy against ships. Piracy Security International Regulations Trade and Transport 2024 1 01 14 21 http://ijmt.ir/article-1-815-en.pdf 10.61186/ijmt.19.14

45-829 2026-07-13 10.1002

International Journal of Maritime Technology ijmt 2345-6000 2476-5333 10.66224/ijmt 2024 19 Tahere Taghizade Firozjaee t.taghizade@shahroodut.ac.ir Farshad Golbabaei Kootenaei f.golbabaei@scu.ac.ir Yadollah Aghdoud Chaboki Yad_chabook@yahoo.com The presence of microplastics in the sea is a significant environmental concern due to their abundance, persistence, and portability. They have the potential for widespread distribution and can cause geophysical and biological impacts. They are persistent pollutants and are widely distributed in all ecosystems, from the atmosphere to the soil, and from groundwater to oceans. Examples of these compounds have been identified in sediments and even in the deep sea. So far, studies on the effects of microplastics on the marine ecosystem have primarily focused on various plankton samples, sand and mud sediments, the ingestion of vertebrates and invertebrates, and the interactions with chemical pollutants. According to studies conducted so far, all groups of marine organisms are at serious risk of interacting with microplastics. Considering this scientific fact, a thorough evaluation of these emerging pollutants is strongly needed. The purpose of this study is to provide valuable information on microplastics, including their sources, distribution, and the effects of pollution on marine organisms. Additionally, this study aims to address the lack of advanced sustainable solutions to effectively manage this hazardous environmental pollutant. Microplastics Pollution Environment Marine organisms Distribution processes 2024 1 01 22 31 http://ijmt.ir/article-1-829-en.pdf 10.61186/ijmt.19.22

45-819 2026-07-13 10.1002

International Journal of Maritime Technology ijmt 2345-6000 2476-5333 10.66224/ijmt 2024 19 Sayed Hamid Sohrabi s.h.sohrabi@mut-es.ac.ir Saeed Parsamehr s.parsamehr@alumni.iut.ac.ir Amir Karimi a.karimi@me.iut.ac.ir Sound-absorbing coatings are of great importance in noise control, thus to make them technically and economically effective, their design optimization is a necessity. Multi-layered homogeneous linings, intended to provide a certain level of absorption, have recently been of much interest among the anechoic coatings. In the present work, first, a mathematical model, called Transfer Matrix Method (TMM) is introduced and validated to properly predict the acoustic response of cavity-less multi-layers. Next, a two-loop optimization technique aimed at maximizing the mean value of echo reduction and minimizing the layers’ total thickness is developed. The outer loop (GP) focuses on the number and order of the layers, while the inner (ICA) is dedicated to the thickness modification of each layer. Finally, results are demonstrated for some specific cases, where promising solutions are found for different constraints and conditions. As an example, comparing a homogeneous coating invented by the GP-ICA (#Generation 50 of Section 5.3) with a typical cavity-included coating used for sound absorption shows that the thickness of this new coating is reduced by nearly two-thirds (from 50 mm to 18 mm), while the first hit of the 20 dB band of Echo Reduction (ER) has reduced by 65 % (from 20 kHz to 7 kHz), and almost did not fall from this level until the end of the frequency domain of interest (40 kHz). That’s while the conventional coating frequency response dropped soon after hitting the 20 dB threshold. Sound Absorption ‎ Imperialistic Competitive Algorithm (ICA) Genetic Programming (GP) Transfer Matrix Method (TMM) Frequency Domain Anechoic Multi-Layer 2024 1 01 32 42 http://ijmt.ir/article-1-819-en.pdf 10.61186/ijmt.19.32

45-825 2026-07-13 10.1002

International Journal of Maritime Technology ijmt 2345-6000 2476-5333 10.66224/ijmt 2024 19 Seyed Mojtaba Hoseini Chavooshi sm.hoseini@stu.qom.ac.ir Reza Kamalian ur.kamalian@qom.ac.ir Numerical modeling is the most common approach for predicting harbor channel siltation. It requires a comprehensive calibration process because there are several calibration parameters. The most crucial criterion for model calibration is suspended sediment concentration (SSC). The agreement between the measured and simulated SSC time series is usually verified based on generic statistical parameters such as RMSE and R2. This method does not address the important phenomena related to channel siltation; for instance, the siltation rate during neap and spring tidal cycles cannot be distinguished in such manner. A process-based calibration procedure has been proposed in this paper which considers some criteria facilitating the calibration processes. Based on analyzing the measured turbidity and current speed data, some criteria were established which convey underlying phenomena affecting sediment transport. They are: (1) the difference between maximum SSC (or turbidity) at neap and spring and (2) at ebb and flood tide, (3) the minimum turbidity at slack water during spring tide, and (4) the current speed-SSC (or turbidity) regression curve. The proposed procedure has been used to calibrate channel siltation in a real case study: Shahid Rajaee port access channel located in the Khoran strait, Iran. As the underlying phenomena affecting sediment transport was considered, the number of simulation runs for calibration processes were considerably decreased. Mud Transport Model calibration Shahid Rajaee Port Suspended sediment transport Channel siltation 2024 1 01 43 56 http://ijmt.ir/article-1-825-en.pdf 10.61186/ijmt.19.43

45-821 2026-07-13 10.1002

International Journal of Maritime Technology ijmt 2345-6000 2476-5333 10.66224/ijmt 2024 19 Hamidreza Mahmoodi h947012046@gmail.com Ahmad Hajivand hajivand@kmsu.ac.ir In this study, Computational Fluid Dynamics (CFD) computations are employed to predict the resistance, trim, sinkage, wave pattern, and bulbous bow performance of the naval model DTMB 5415 in shallow water. The simulations encompass resistance tests at various depths and velocities within the CFD environment. The impact of water depth reduction on frictional and pressure resistance components, as well as ship trimming and sinking, is assessed. A comprehensive analysis of changes in the wave pattern around the ship is conducted. Numerical results exhibit a substantial increase in resistance, trim, and sinkage with decreasing depth, highlighting the profound influence of shallow water conditions on the hydrodynamic behavior of the ship.   Shallow water CFD Wave pattern Resistance test 2024 1 01 57 64 http://ijmt.ir/article-1-821-en.pdf 10.61186/ijmt.19.57