Abstract: A method and reactor are disclosed for separating and removing heavy metals from wastewater using a sulfhydryl-modified nano-magnetized activated carbon. The method includes the steps of preparing a sulfhydryl-modified nano-magnetized activated carbon first; introducing heavy-metal-containing wastewater into a reactor which is equipped with a stirrer and keeping stirring, and then adding the sulfhydryl-modified nano-magnetized activated carbon, continuously stirring for a reaction; after reacting for a period, precipitating under a magnetic field generated by a magnet separator, discharging the resulting supernate, and then discharging the precipitated sludge.

Abstract: The present invention involves a method for manufacturing a blade (1) for a propeller, which blade (1) has a leading edge (2) and a trailing edge, the method comprising the steps of: forming a conduit in the blade (1), making a plurality of holes (7) through which the conduit (6) communicates with the exterior of the blade (1), and providing a blade blank having an edge part receiving surface (4) extending along at least a major part of the leading edge (2) of the blade (1) to be manufactured, wherein forming a conduit (6) comprises building up an edge part (3) onto the edge part receiving surface (4) by a wire-based additive manufacturing process, wherein the additive manufacturing process is adapted to form the conduit (6) at least partly delimited by the edge part (3) and extending along the leading edge (2) of the blade (1) to be manufactured.

Abstract: A transverse hydro-laminar flow system is a system that improves laminar flow across a watercraft's hull as the watercraft is moving through a body of water. The system may include air dispersal units, a first base anchor, a second base anchor, an air supply system, a controller, and a power system. The air dispersal units enable the creation of an air layer between the watercraft's hull and the surrounding water. The first base anchor and the second base anchor facilitate the fastening of the air dispersal units about the watercraft's hull without the need to dry dock the watercraft. The air supply system provides a constant air flow to each of the air dispersal units to enable the creation of the air layer that reaches most of the watercraft's hull. The controller enables the configuration of the system, while the power system supplies the necessary power for the system operation.

Abstract: The present invention discloses a marine fishtail rudder, including a rudder blade, a first tail plate and a second tail plate. The rudder blade includes a first rudder surface and a second rudder surface. The first tail plate is hinged on the first rudder surface. The second tail plate is hinged on the second rudder surface. An electric motor is provided in the rudder blade. The electric motor is used to drive the first tail plate and the second tail plate to rotate, so that a trailing edge of the first tail plate and a trailing edge of the second tail plate are close to or away from a trailing edge of the rudder blade. The present invention discloses a marine fishtail rudder, wherein tail plates are respectively arranged on the two rudder surfaces of a rudder tail portion, and the tail plates are rotated by an electric motor. When steering, the tail plates are unfolded to form a rudder shape of a fishtail rudder to obtain a higher rudder effect.

Abstract: This invention discloses a positioning and welding method for a ship stern thruster that relates to the technical field of ship manufacturing. A stern thruster is installed after adjusting and cutting hull stiffener panels according to the fitting condition of a prosthesis and a hull stiffener panel. The actions of manufacturing and installing the model, positioning the model structure by setting wire, adjusting the fitting condition of the model's stiffener panel and the hull stiffener panel can make it convenient to set wire and make it accurate to position the model. So the stern thruster is easy to install. The model can be repeatedly used, and the method is suitable for quantitative production.

Abstract: This invention discloses a positioning and welding method for a ship stern thruster that relates to the technical field of ship manufacturing. A stern thruster is installed after adjusting and cutting hull stiffener panels according to the fitting condition of a prosthesis and a hull stiffener panel. The actions of manufacturing and installing the model, positioning the model structure by setting wire, adjusting the fitting condition of the model's stiffener panel and the hull stiffener panel can make it convenient to set wire and make it accurate to position the model. So the stern thruster is easy to install. The model can be repeatedly used, and the method is suitable for quantitative production.

Abstract: Systems and methods for initiating an emergency disconnect sequence (EDS) are provided. In an aspect, a disconnection system is provided and configured to initiate the EDS, and includes a controller including a processor and a memory operably coupled to the processor. The controller receives, from a set of motion reference units (MRU(s)) operably coupled to a flexible joint, position data generated by the set of motion references units and associated with the joint when the joint is operably coupled to and disposed between a drilling riser and a lower marine riser package (LMRP). The controller determines, based on the position data, an angular offset of the joint. The controller sends, to a subsea control pod disposed at or adjacent to the LMRP, a trigger signal in response to determining that the angular offset exceeds a predetermined threshold, such that the subsea control pod initiates the EDS.

Abstract: Various aspects provide for a propulsion system (200) for a ship (100) comprising at least first and second thrusters (205, 206) and first and second directors (220, 720), wherein a computing platform (300) is coupled to the thrusters and directors being configured to receive desired longitudinal and lateral headings (750, 760) and determine a configuration of the propulsion system that is expected to propel the ship in the desired longitudinal and lateral headings.

Abstract: The present invention provides an operating method and an operating system of a multiple underwater vehicles 30, wherein exploration missions and exploration depths of the multiple underwater vehicles 30 are differently set in the underwater vehicles 30 for exploring a water bottom, the multiple underwater vehicles 30 are submerged to the respective set exploration depths, the multiple underwater vehicles 30 are made to cruise at the respective set exploration depths to execute the exploration missions, and execution results of the exploration missions are recorded and/or transmitted. According to this, it is possible to deploy and operate the multiple underwater vehicles and safely and efficiently explore the water bottom.

Abstract: Provided are an acoustic Luneburg meta lens including a lens structure on the substrate or a lens structure connected to each other by connecting rods, wherein the lens structure includes a plurality of unit structures, the volume of the unit structures decreases from the center of the lens structure toward an edge thereof, and positions of the unit structures are determined by direction components of a polar coordinate system or a spherical coordinate system, and a method for designing the acoustic Luneburg meta lens.

Abstract: Marine energy storage unit with thermal runaway safety barriers to prevent cell temperature increase, said marine energy storage unit comprises at least one closed module cabinet (10) with a plurality of stacked battery cells (4) and an internal cooling system. The internal cooling system comprises an enclosed cabinet cooling circuit (3) with a water-to-air exchanger (20) for air cooling of the battery cells (4), and the water-to-air exchanger (20) is connected to a water-to-water heat exchanger (30) for receipt of water from an external source.

Abstract: A thruster for propelling a marine vessel, the apparatus comprising an upper housing, a lower housing, the lower housing being arranged to rotate relative to the upper housing, a first body arranged within the upper housing, the first body comprising a first inductor to provide a magnetic field, and a second body arranged within the lower housing, the second body comprising a second inductor to generate an electrical current from the magnetic field.

Abstract: A method for designing startup critical tube diameter of pulsating heat pipe in vertical state, including the following steps: step 1. establishing a first model of working medium mass in pulsating heat pipe; step 2. establishing a second model of working medium mass in pulsating heat pipe, the second model including the vapor working medium mass model and the liquid working medium mass model in the pulsating heat pipe; step 3. according to the law of conservation of mass, combining the first model and the second model, and determining the volume percentage of the liquid working medium in the total length of the pulsating heat pipe under the condition of heat addition; step 4.

Abstract: A method for loading break bulk cargo ships includes stacking one or more cargo layers in a hold of the break bulk cargo ship, wherein the stacking includes placing a bottom layer for each cargo layer, where the bottom layer is formed by one or more mats manufactured from an elastically deformable material, such that the mats form strips which extend adjacently of each other in elongate manner. The stacking further includes placing at least one layer of goods on the bottom layer, where the at least one layer of goods is formed by one or more layers of break bulk goods.

Abstract: Method of inspecting hazardous area equipment (10, 110, 210). The method is a non- invasive inspection of an electrical or electronic component of the hazardous area equipment (10, 110, 210). The non-invasive inspection includes a radiographic inspection of the equipment (10, 110, 210).

Abstract: A compliant net support system for supporting a net of a marine barrier is provided. Embodiments include a floating marine barrier module comprising a flotation device; a supporting framework attached to the flotation device; a plurality of impact net support posts; and an impact net attached to each of the support posts and extending between the plurality of support posts along a longitudinal axis of the barrier module. At least one of the impact net support posts is a compliant net support post having a unidirectionally elastic spring element attached between a bottom of the support post and the supporting framework; and the spring element is movable in a direction substantially parallel to the longitudinal axis of the barrier module, and substantially inflexible in a direction substantially perpendicular to the longitudinal axis of the barrier module.

Abstract: The present disclosure relates generally to the field of facilitating a laminar flow and sound mitigation between a wetted hull of a vessel and surrounding fluid. More specifically, the present disclosure includes methods, systems, and apparatuses to facilitate providing and sustaining a laminar flow of a fluid across a vessel. A system for sustaining laminar flow of a fluid across a vessel comprising a main control unit. The main control unit comprises one or more air compressor units configured to generate air. An integrated longitudinal air distribution assembly is secured to a wetted hull of the vessel. The distribution assembly comprises a series of air dispersal modules configured to distribute the generated air across the wetted hull of the vessel to create at least one air layer between the wetted hull of the vessel and the fluid to sustain the laminar flow of the fluid across the vessel.

Abstract: The invention relates to a pod propulsion device including a motor casing (3) and a strut (2), which strut (2) is connected at a lower part thereof to the motor casing (3) and is arranged to be connected at an upper part thereof to a hull (1) of a ship. The motor casing (3) includes a housing (6) enclosing an electric motor (5) with a stator and a rotor, which housing (6) has an upper portion. According to the invention a stationary heat conducting means (7) is arranged in contact with said upper portion, which heat conducting means (7) is arranged to conductively connect the upper portion to at least one outer wall (21) of the strut (2). The invention also relates to a ship provided with such pod propulsion device and to a method for cooling a pod propulsion device.

Abstract: A floating-oil recovery device includes: a bubble-curtain generation mechanism configured to discharge air into water to generate a bubble curtain in the water so as to increase a thickness of a film of floating oil while regulating spread of the floating oil; and an ejector configured to recover an oil-water mixed fluid having the floating oil and the water mixed with each other by jetting high-velocity water toward the film of floating oil enclosed with the bubble curtain to destroy the film of floating oil.

Abstract: A system for contactless power transmission in an azimuth thruster, the system comprising a first body (76) comprising at least one first inductor to provide a magnetic field, a second body (78) comprising at least one second inductor to generate an electrical current from the magnetic field, the bodies being configured to be relatively rotatable, the at least one first inductor and the at least one second inductor being configured to generate an electrical current from the magnetic field at all relative rotational positions, wherein the or each of the first inductors are tuned to resonate within a predetermined frequency band and the or each of the second inductors are tuned to resonate within a predetermined frequency band, the frequency band of the or each of the second inductors at least partially overlapping with the frequency band of the or each of the first inductors.