bluuebunny/crossref_metadata_2025_split huggingface dataset:
Analysis of the internal-design factor to the patrol boat: A study of hull resistance using Savitsky and Holtrop approaches
Authors: Lutfi M A , Prabowo A R , Do Q T , Muttaqie T , Cho J H 
Published: December 2023

Abstract
The issue with sea transportation is the high operational costs due to fuel consumption. Ship resistance generated by the shape of the ship hull is one factor that affects efficiency. Internal factors that affect the hull’s resistance include the frontal area, appendage area, and appendage factor. In previous studies, research has been conducted on the effect of adding appendages to the hull and hull design variations on resistance. However, research on the influence of internal factors, e.g., rudder surface area and frontal area of the bow on hull resistance of monohull-type ships still need to be done. In this study, the effect of the type of internal factor is to be by considering the calculation of the hull resistance using the Savitsky method and Holtrop formula. Several hull designs with variations on adding the applied appendages are proposed to be the subjects of this study. The effect of the internal factors on the hull performance, i.e., resistance, is quantified to conclude the parameter which provides the highest effect.
Numerical study on cavitation reduction using PressurePores technology
Authors: Mai Linh Hoang Thi , Danh Bui Thanh , Hai Ha Nguyen Thi 
Published: December 2023

Abstract
The requirements in marine propeller design are rising in quantity and quality in recent decades. Besides hydrodynamic performance demand, the targets in reducing propeller cavitation and its side effects need to be considered such as underwater radiated noise and pressure pulses, to ensure comfort requirements and environmental regulations. Using numerical simulation, the present paper investigates the reduction of propeller tip vortex cavitation (TVC) as well as the effects on its performance by employing PressurePores technology. This study uses the Potsdam Propeller Test Case (PPTC) model with commercial code STAR CCM+. The CFD results are compared with the test results in the cavitation tunnel to validate the reliability of numerical simulation. In addition, cavitation mitigation of the propeller is estimated and an obtained average performance degradation is only 2% for different cases, in terms of pore diameters and drilling methods (cylindrical pore and conus pore). This research also provides the changes in pressure distribution, turbulent viscosity, and vorticity around the propeller to clarify the reason for cavitation reduction together with the hydrodynamic efficiency degradation of the propeller.
Ultimate strength of aged ships under hull structure’s imperfections
Authors: Tuyen Vu Van 
Published: December 2023

Abstract
Ship hull structures, particularly those with extended service life, contain various imperfections, including initial deformities, residual stresses, and corrosion-induced degradation. Such variables critically influence the structural integrity of the hull girder. Consequently, comprehending the residual strength capacity of the hull girder is paramount for guaranteeing the vessel’s operational safety and dependability, especially under severe loading scenarios. The existing methods to determine the hull girder’s ultimate bending moment either ignore imperfections or consider imperfections such as initial deformations or residual stresses but with the assumption of a fixed level. In the current study, the stress distribution method and incremental-iterative method are used; and solutions are proposed to cover factors such as initial deformations, residual stresses, and corrosion. A single skin bulk carrier, 56,000 DWT of deadweight, is employed as the demonstrative example. Eleven cases of imperfections are suggested, and the variations of ultimate bending moment for hogging and sagging conditions under the effect of uncertainties are analyzed and evaluated. The results of the current study are offered and discussed. Several concluding remarks are also presented.
Investigation of wave effects on motion of an unmanned surface vehicle at various scales
Authors: Nguyen Tien Thua , Pham Quoc Thai , Phan Thanh Long 
Published: December 2023

Abstract
Motion characteristics of unmanned surface vehicle are mainly affected by sea wave during its operation. This paper shows the numerical results of the unmanned surface ship at various scales in irregular waves based on the boundary element method. The effects of different sea states on each scaled model in a head sea, bow quartering sea, and beam sea are analyzed to predict the safety region of the ship motion. The significant amplitudes of ship motion are obtained from the ship motion responses in regular waves. Steady wave drift forces in the cases of bow oblique sea are calculated to find the impact of second-order waves on the models. It is proved that the motion of model C is remarkable in the narrow frequency domain from 0.2 to 1.4 rad/s but the ship responses of model A are considerable in the range of frequency of 0.2 to 2.5 rad/s. The significant amplitude of surge and pitch motion reaches the peak values in head sea conditions while the peak values of yaw motion are in the oblique sea of 120 degrees. The left motion is maximum in head sea condition.
Dynamic impact response and residual strength of container ship under dropped object
Authors: Nguyen Huy Vu , Do Quang Thang 
Published: December 2023

AbstractThis study aims to present numerical investigations on container ships’ residual longitudinal ultimate strength subjected to dropped container collisions. First, the commercial software ABAQUS was applied. The accuracy and reliability of the proposed numerical analyses were established by comparing the numerical results with the experimental results. Next, parametric studies were carried out on actual container ships to assess the degree of loss of the ship’s longitudinal strength in two dangerous situations a ship sagging and hogging. The effects of parameters including drop heigh and impact angles on the ultimate longitudinal strength of the ship have been investigated. The results present in this study can be applied to predict the residual longitudinal strength of dropped container collisions on a container ship. It is also useful for the initial design stage of ship structures in case of collision incidents.
Numerical Investigation on the Motion of a High-Speed Planning Hull in Calm Water Condition using RANSE Method
Authors: Ha Tran Viet , Tu Tran Ngoc , Ngoc Pham Minh 
Published: December 2023

Abstract
Planing hulls were commonly used in both civilian and military situations. The prediction of the motion of the planing hull was complicated due to the trim angle and sinkage oscillations caused by the lift variations and complex hydrodynamic interactions at high speeds. To evaluated the motion of the planing hull, it was essential to analyse the hydrodynamic performance of the planing hull at high speed. This paper presented a CFD method for calculating the hydrodynamics of a planing hull in calm water conditions at different Froude numbers. The numerical method was based on the Reynolds-averaged Navier-Stokes equation (RANSE). The volume of fluid (VOF) and two degrees of freedom equations were utilized. An efficient procedure was introduced to solve numerical divergence in numerical simulations. Resistances of the planing hull in numerical results were compared with experimental results to verified and validated the used RANSE method.
Numerical Investigation on the Influence of Ship Hull Form Modification on Resistance of the 4600DWT Cargo Ship Using RANSE Method
Authors: Ngoc Vu Minh , Hai Ha Nguyen Thi , Ngoc Pham Minh , Tung Dam Van , Hao Nguyen Huy , Tu Tran Ngoc 
Published: December 2023

Abstract
Optimization of ship hull form in the ship design process aims to reduce ship resistance, which is crucial for economic efficiency and meets the International Maritime Organization (IMO) requirement for emission reduction and energy saving. This paper investigates the impact of the longitudinal centre of buoyancy (LCB) position on the resistance of a cargo ship 4600DWT using the RANSE (Reynolds – averaged Navier – Stokes equation) method. The ship hull form was modified using the Lackenby method. The obtained numerical results indicate that the LCB position significantly affects ship resistance. The physical phenomenon of the change in ship resistance is also explained through the analysis of the differences in the flow field around the ship’s hull form with modified LCB positions.
Numerical Simulation Flow Around The 4600DWT Cargo Ship in Calm Water Condition Using RANSE Method
Authors: Ngoc Vu Minh , Hai Ha Nguyen Thi , Ngoc Pham Minh , Tung Dam Van , Hao Nguyen Huy , Tu Tran Ngoc 
Published: December 2023

Abstract
Information about the flow field around the ship may enable the designers to improve ship hull form concerning ship hydrodynamics. The flow around the ship can be obtained through model tests in towing tank and simulations. However, the experimental method provides the most reliable data about flow around the ship, but this method is too expensive and time-consuming. Currently, the RANSE (Reynolds – averaged Navier – Stokes equation) method has been widely employed in predicting the ship resistance and flow around the ship in the ship design process due to it provides relatively accurate results, savings in time and money compared to the experimental method. Therefore, this paper deals with the numerical results of the study flow around the 4600DWT cargo ship, which operate on Vietnam’s river-sea routes in calm water condition at different ship speeds using the RANSE method. The effect of ship speed on ship resistance components, wave pattern, wave profile along the ship, distribution of dynamic pressure, and wall shear stress on the ship’s hull surface and nominal wake field are presented and analysed in the paper.
Assessment of predicting temperature distribution of friction stir welded AA6061 induced by pin profiles for developing sustainable industry
Authors: Tien Dat Tra Ngoc , Duong Hao Dinh , Hoa Vu Cong , Tran Tra Hung 
Published: December 2023

Abstract
Nowadays, the aspects of energy and environmental pollution have been becoming a big challenge in developing sustainable industries. Using green technology is considered as priority solution for any manufacturing process. Friction stir welding (FSW) is invented as green technology applied widely in many field industries. To evaluate its applicability, this study focused on the prediction of temperature distribution of FSWed AA6061 induced by various pin profiles. Research efforts are being made to gain a better understanding of FSW process, to explore different tool configurations, and their influence on the heat generation. The numerical model was developed in Abaqus software, utilizing the coupled Eulerian Lagrangian method, the Johnson-Cook material model, and the mass scaling technique. The model’s accuracy is verified by comparing its simulated temperature values with experimental data in Stir zone (SZ) and Heat-affected zone (HAZ). The numerical results show the high correlation with the experimental study, with the deviation around 10%. It is shown that tool pin profiles with the combination of thread and flat features generated the highest temperature.
A Numerical Simulation and Multi-objective Optimization for the Plastic Injection Molding of a Centrifugal Pump Casing
Authors: Nguyen Huu-That , Nguyen Minh-Quan 
Published: December 2023

Abstract
Plastic pumps are used to efficiently move liquids within aquaculture systems and seafood processing facilities. Commonly, the centrifugal pump casing is fabricated by plastic injection molding technology. In the plastic injection molding process, the control parameters are essential to the success of plastic molding product fabrication. This study aims to optimize process parameters for the quality of centrifugal pump casing during plastic injection molding using a combination of response surface methodology (RSM) and the NSGA-II method. Firstly, the L27 orthogonal array design of the experiment method is used, which has four input variables, including plastic temperature, mold temperature, cooling time, and injection time (filling time and packing time). The output responses of the injection molding process to be evaluated are the warpage and shrinkage deformation of the molded product. After obtaining data, the RSM model is applied to describe the relationship between the input and output variables. Finally, multi-objective optimization uses the NSGA-II method for the best product quality. The results show that the optimized parameters for injection molding of the centrifugal pump casing are a plastic temperature of 200°C, mold temperature of 65°C, cooling time of 25s, and injection time of 10s with warpage of 0.868 mm, and shrinkage of 10.104mm.
Investigation on microplastics in some bivalves at Binh Dien Market in Hochiminh City, Vietnam
Authors: Dao Thanh-Son , Lai Dang-Minh-Tri , Nguyen Quoc-Hung , Pham Anh-Duc , La Xuan-Thao , Tran Anh-Tu , Bui Xuan-Thanh 
Published: December 2023

Abstract
Microplastics (MPs) and their risk to living things and human health have been attained a lot of attention worldwide. Reports on the MPs in mollusks used as seafood are being increased in all continents. However, the information is limited in Vietnam. This study aimed to identify the quantitative presence of MPs in three bivalves (Anadara granosa, Meretrix lyrata, and Ensidens sp.) in Hochiminh City which are popularly used as daily seafood by local residents. Samples of the bivalves were bought biweekly from the wholesale market Binh Dien, Hochiminh City, from February to April 2022. All three bivalve species were found with fiber MPs in their tissues. The concentrations of MPs (mean ± standard deviation) were 8.9 ± 5.4 items/individual (idv), and 4.2 ± 3.2 items/gram wet weight (g ww) in the A. granosa; 6.4 ± 2.6 items/idv, and 1.1 ± 0.4 items/g ww in the M. lyrata; and 5.9 ± 2.8 items/idv, and 0.7 ± 0.3 items/g ww in the Ensidens sp. The shorter length the fiber MPs were, the higher concentration they were, in the samples. Eight different colors of MPs in the bivalves were observed including blue, black, red, yellow, green, white, pink and grey in which the blue color was dominant in the samples. Chemical analysis with the fourier transform infrared microspectroscope revealed that 50% of fibers were polyethylene terephthalate (PET), polyethylene (PE) and rayon. This study firstly reported the MPs in the Ensidens sp. and the A. granosa (as items/ g ww). The total fiber intake from the three bivalve consumption was approximately 3,992 items per person per year. The presence of MPs in the bivalves used as food in Hochiminh City possesses a health risk to local people who commonly consume them as daily food. Further insight studies on the effects of MPs from food on human health in Hochiminh City are suggested.
The generation pathways of OH and H2O2 by plasma-liquid interactions
Authors: Thai Van-Phuoc , Dam Tran Ngoc , Takahashi Kazumasa , Sasaki Toru , Kikuchi Takashi 
Published: December 2023

Abstract
Plasma-liquid interactions (PLIs) are a rich source providing many reactive oxygen species (ROS). These ROS species, such as OH and H2O2, feature powerful oxidative properties, which are excellent utilization for bacterial killing, water treatment, and other applications. Lifetime and reaction pathways of ROS species from plasma into the bulk liquid are complex. Understanding these behaviors is essential for the applications of the ROS species. In this work, we presented two pathways for generation of OH radicals and H2O2 from the plasma into the bulk liquid. Firstly, OH radicals are mainly produced via the dissociation of water molecules by free electrons in the plasma. Generated radicals then quickly recombine into H2O2. These species with a high Henry constant easily absorb and disperse into the bulk liquid. In a second way, OH radicals and H2O2 are also generated by the reaction of O3 with H2O molecules. At first, O3 is absorbed into the bulk liquid and reacts with H2O2 molecules to generate H2O2. Next, O3 continues reacting with this generated H2O2 to produce OH radicals.
Wave dissipation by vegetation for coastal defense in the Western Mekong Delta under climate change
Authors: Thu Nguyen Ha Thi , Chinh Vu Dan 
Published: December 2023

Abstract
The combination of the Mekong Delta dyke-mangrove system effectively protects the hinterland against flooding and erosion in extreme conditions for decades since they could dissipate waves and currents efficiently. However, literature and satellite data indicate that severe erosion happens along the Western sea-dykes of the Ca Mau coast caused by increased intensity of storms due to climate change. State-of-the-art wave transformation models are used to predict the influences of wave propagation and wave overtopping discharge over sea dykes and/or associated with mangrove ecosystems under extreme typhoons, which cooperates with both high – frequencies (HF) and low – frequencies (LF) waves. Results confirm that the HF wave quickly dissipates in shallow water, whereas the LF wave is dominant and penetrates over a longer distance. At dyke toe, the wave height through vegetation is substantially diminished, approximately ten times less than that in the sea-dyke solely. However, the modelling wave overtopping discharge seems to be overestimated compared with the standard-based formula.
Watercraft tracking and monitoring system towards safe and resilient marine communication systems
Authors: Salido Julie Ann A. , Gelonga Rowen R. , Porcal Abraham A. , Popes Ma. Fe P. , Oquendo Miquel Von R. , Martirez Mary Ann P. , Hilario Kirk M. 
Published: December 2023

Abstract
In this research, Sea-condition Emergency Alert and Warning Apparatus for Vessel Safety (SEAWAVES) is a watercraft tracking and monitoring system developed and deployed to monitor watercraft and sea conditions to provide a safer and more resilient marine communication system. The proposed method puts together an application of contemporary technology using the fused location provider Application Programming Interface (API) to retrieve the device’s current location. In addition to managing the underlying location technologies, like Global Positioning System (GPS) and Wi-Fi, the fused location provider offers a straightforward API that you may use to specify the desired level of service. The work includes calibrating the compass, GPS, and Global System for Mobile Communication (GSM) for watercraft tracking and monitoring using Android sensors of mobile phones. The GPS provides the present site of the watercraft; General packet radio service (GPRS) sends the tracking information to the server and thus an alert message generated is transmitted to the registered monitoring systems. This scheme is deployed in the watercraft to monitor location and sea conditions, which are to be determined on the web page and supervised in real-time. Hence, if the watercraft is at a critical level, alert messages will be sent to the monitoring system, and the registered mobile phone number of the watercraft. Also a warning display and sound are produced by the device. The SEAWAVES tracking and monitoring system could be recommended for use onboard a watercraft throughout the country for effective management and monitoring of the performance of such watercraft, and low-cost instrumentation as a stand-alone system through modern technologies.
Energy absorption capacity under tensile and compressive loads of auxetic metamaterial structures
Authors: Nhat Nguyen Minh Phuc , Vu Cong Hoa , Nguyen Minh Ngoc 
Published: December 2023

Abstract
An auxetic metamaterial is a mechanical metamaterial with a negative Poisson’s ratio. When compressed or stretched in one direction, it contracts or expands in a perpendicular direction. This review paper focuses on the energy absorption of auxetic metamaterial structures and their applications. Starting with the original structure proposed by D. Han et al., another structural model with heuristically enhanced ribs is proposed to suit the structure’s anisotropy, reduce mass, and increase energy absorption. An extension to this is the newly designed MH-1 model, which is lightweight compared to commonly reported auxetic forms. Numerical results show that MH-1 has the best specific energy absorption and exhibits an obvious auxetic effect under tension, with symmetrical and stable deformation modes. Auxetic metamaterials are also progressively finding applications in the biomedical field. One of the most promising applications of auxetic is in the development of new and improved prosthetics and implants.
Review of the corrosion behaviour in tannic-acid coated magnesium implants
Authors: Asawan Esa Lahan , Sihombing Jackson , Nurrochman Andrieanto , Prajatelistia Ekavianty 
Published: December 2023

Abstract
Magnesium is a bio-degradable material used for bone implants because of its similar mechanical properties to bones. However, magnesium has a high corrosion rate, resulting in an implant’s degradation before the bone is fully healed. Thus, researches are conducted to study ways to improve the corrosion resistance of magnesium. Coating is one of the methods to hinder the corrosion rate of magnesium. There are two types of coatings: organic and inorganic. Organic coatings are preferable due to their non-toxicity and good biocompatibility. Tannic acid (TA) is an organic coating with a strong bond with magnesium due to its many hydroxyl groups. Besides bonding with the substrate material, tannic acid can also bind with other compounds or elements to improve the performance of the coating layer. This review evaluated several types of TA-based coatings on magnesium alloys used in orthopaedic implants and the fabrication processes affecting the structural integrity of the coating. The strategies for using TA-compound combination for corrosion mitigation with ease of fabrication process were also highlighted. This review is expected to provide some insight on the challenges and future directions of TA-based magnesium coatings for orthopaedic applications.
Recent advances in nano/micro systems for improved circulation stability, enhanced tumor targeting, penetration, and intracellular drug delivery: a review
Authors: Chan Wei-Jen , Li Huatian 
Published: December 2023

Abstract
In recent years, nanoparticles (NPs) have been extensively developed as drug carriers to overcome the limitations of cancer therapeutics. However, there are several biological barriers to nanomedicines, which include the lack of stability in circulation, limited target specificity, low penetration into tumors and insufficient cellular uptake, restricting the active targeting toward tumors of nanomedicines. To address these challenges, a variety of promising strategies were developed recently, as they can be designed to improve NP accumulation and penetration in tumor tissues, circulation stability, tumor targeting, and intracellular uptake. In this Review, we summarized nanomaterials developed in recent three years that could be utilized to improve drug delivery for cancer treatments.