Biopolymers are utilized extensively in the medical field. The production of biodegradable bone screws for implants utilizing biopolymer materials is one advances developments. Polylactic acid (PLA) a frequently employed medicinal applications. Using 3D printing, this research was done to create screw derived from PLA. printing process chosen reduce cost and duration repair. A nozzle temperature 210oC bed 60oC PLA screws. torque test, fracture analysis, density biodegradation test were...

Pakan ternak merupakan faktor terbesar yang mempengaruhi produktivitas ternak. Dalam hal ini, mitra masih mengalami kendala dalam proses pengeringan pelet sebagai pakan Hal dilakukan dengan melakukan terdahulu yaitu secara konvensional dijemur dibawah terik sinar matahari, sehingga tidak efektif mengeringkan Oleh karena itu perlu penerapan teknologi dari hasil pengolahan menggunakan mesin rotary dryer. Mesin pengering dryer dapat dikeringkan drum terbuat baja tahan karat dan sistem kontrol...

Chitosan has been broadly utilized in bone scaffold production because of its antibacterial qualities, low toxicity, biodegradability, biocompatibility, and ability to aid regeneration processes wound healing. In this work, chitosan was produced from crab shell waste through demineralization, deproteination, deacetylation, utilizing HCl 1:7 (v/v), NaOH 3%, 1:10 (v/w), 50%. The aim study is examine the deacetylation temperature’s impact towards crystallinity index, chemical bond, degree...

The tourism sector contributes significantly to the economic growth of community and country. Labuan Bajo has potential for marine tourism, which is famous foreign classes. separation islands in requires transportation support tourist activities destinations. One type needs leisure boats or recreational boats. ship must have standards comfort, security passenger safety, efficient operational costs. It necessary infrastructure form a that functions optimally, so research on hull’s...

Fatigue failure is a phenomenon that often occurs in mechanical structures, especially components receive direct cyclic loading, e.g., marine facilities, automobiles, critical infrastructure, reservoirs, turbines, nuclear reactors, and features work extreme conditions. Several factors can affect fatigue resistance, including applied material type, environment temperature, microstructure state, residual stress, corrosion, crack initiation. Accurately estimating life critical. A variety of...

Indonesia is a maritime country with two-thirds of its territory the ocean. has diversity marine resources total fish production continuing each year to reach 8.02 million tons. The traditional fishing vessel one transportation and livelihood support in was made based on knowledge from generation generation. Thus, investigation vessels must be conducted measure resistance profile wave pattern. This analysis consider mono-hull design. use numerical approach rapid predict performance ship...

The potential of wind energy sources in Indonesia is quite large, with a 60 GW. This fact shows that has great to be developed into major source Indonesia, especially the development power plants. growth plants line government regulations, where targeting 2050 new renewable can supply national by 25%. research, literature review been carried out on supporting components turbine structure affect performance. performance influenced several things, including materials, rotors, and structure....

<span lang="EN-GB">This review paper provides an overview of simulation-based hydrodynamic design optimization for ship hull forms. It also includes a numerical analysis aimed at accomplish early-stage in terms performance. A module, surface modeling and module are the primary components this analysis. The both simple approaches high-fidelity numeric tools; these integrated tools used to evaluate performances different stages. offers variety techniques representation modification. is...

The deep-v planing hull is designed to operate at high speeds because most of the hull’s weight supported by hydrodynamic lift acting on base. Planing form characteristics such as deadrise angle, chines, and extended stern significantly affect ship’s performance. addition interceptor an innovation reduce total resistance ship controlling trim angle. However, not always same; thus, it needs be studied based stern. refers modifying geometry rear, particularly extension beyond its conventional...

Abstract Abundant marine natural resources make Indonesia have potential in the field of tourism. Karimunjawa is one regions that still relies on tourism as main sector supporting economy. Unfortunately, existing modes transportation are dominated by traditional ships low performance, safety, and comfort. Therefore, infrastructure development needed developing a leisure boat design has stability good ship movement so tourists comfortable safe trip. This study focuses optimizing hydrodynamic...

As a part of the important thing in ship design is propeller design. Propeller its self has many kinds This study investigates effect on performance ducted propeller. The investigation was carried out by solving Navier-Stokes equations with Computational Fluid Dynamics (CFD) method. These simulations were compared accordance SHUSKIN nozzle that 3 types Each type thruster model indicates different force and torque. Thus, for analysis will be generated each it can discovered which most optimal...

This paper inspects the capability if using Computational Fluid Dynamics (CFD) tools to investigate effect of free surface with marine propeller. We conducted numerical simulation for propeller performance on open-water test. The simulations were compared meshing strategies show that thrust and torque. OpenFOAM was applied solve problem, where open water performances (KP505) is estimated by a Reynold-average Navier-Stokes equations (RANS) solver which three-dimensional unsteady...

This study aims to prove the usefulness of a bulbous bow traditional catamaran fishing vessel. Bulbous applications are widely used reduce wave resistance. The vessel resistance was calculated using CFD (Computational Fluid Dynamic) approach and combined with classical slender body theory. In this research, application being adopted on total has based Kracht method. Modeling procedure developed by linear form coefficients. ship simulated Tdyn software which basically Finite Element Method....

Remotely Operated Vehicle (ROV) is one of the technology that can facilitate for observing and exploring underwater condition (sea). The design manufacturing process robots needs many support increase performance robot to do some missions. Thruster main component which has function as an actuator during operation. In present study, propeller most important solving problem ROV. For optimization thrust, Genetic Algorithms (GA) powerfully search parameters in large multidimensional space. Thus,...

As the modernization of marine transportation, it should be needed strategy to improve vehicle performances. The propeller is one important parts which has a function as an actuator during operation transportation or vehicle. design and optimization are packages gain best performances, included for ducted propeller. Since Nozzle crucial aspects that influences efficiency In present study, nozzle been proposed by using moving location based on percentage duct length. were modelled in...

In this study, numerical investigation of ship resistance and motions at the traditional Indonesian fishing vessel is presented. The Computational Fluid Dynamic (CFD) code used to calculate three dimensional, incompressible, RANS equations. Different types hull form were performed. research, data collected chosen in north south coast Java island. models drawing required for performing analysis, developed using Rhinoceros. present open-source computational fluid dynamics library, OpenFOAM was...

Abstract The need for fossil fuels is increasing every year. Various threats were made to obtain efficient fuel consumption. This study aims determine the effect of Pertamina Dex and biodiesel on RPM method used an experiment a diesel engine. Mixing with certain composition. mixing variations 0%, 10%, 30%, 40%, 50% at 1000RPM, 1500RPM, 2000RPM. results this are (1) 100% most 1000 1500 RPM, (2) mixture 70% 30% Biodiesel 2000 (3) fuel-efficient 1000, 3000 RPM.

Abstract In the field of logistics, containers are indispensable for shipments large quantities goods, particularly exports and imports distributed by land, sea, or air. Therefore, a container must be able to withstand external loads so that goods can safely reach their destination. this study, seven different models skins were developed: general honeycomb, cross square corrugated wall, flat, flat with single stiffener, stiffener. Testing was performed using finite element method. static...

Green ship technology is increasingly important in different areas of design. Hydrodynamic optimization shape design an integral part the overall fuel economy To get optimal design, geometry modification takes extremely place loop. A conventional non-parametric approach has numerous disadvantages because typically generated by low-level entities. In this study, a new bulbous bow method was developed for automatic generation and bow. represented Non-Uniform Rational B-Spline (NURBS) surfaces....

The numerical approach is being used against experimental and solves engineering problems. In the design, structural load analysis are a part of an important thing to show effect geometrical or structure design. main purpose review influence deckhouse height on flow around funnel aft ship structure. this study, fluid-structure 3D steady RANS CFD validate result simulations. Several aspects approach, such as turbulence modeling, boundary conditions, inlet velocity, pressure outlet simulate...