92 results about "Trapezia" patented technology

The invention provides an auxiliary structure for beach and shallow sea ecological restoration and a restoration system construction method, and belongs to the technical field of water conservancy projects for beach and shallow sea ecological restoration. The auxiliary structure comprises a combined type permeable submerged dike structure, a natural wave dissipation combined pile body and an oyster cultivation net-shaped structure. The combined type permeable submerged dike structure comprises hexagonal hollow prisms and isosceles trapezoid hollow prisms, the two prisms are of a staggered and stacked structure, and a natural shelter is provided for small marine organisms. The natural wave dissipation combined pile bodies penetrate through the combined type permeable submerged dike structure through the upper holes and the lower holes of the prisms, and the combined type permeable submerged dike structure is effectively supported and fixed. The oyster cultivation net-shaped structure is fixed to the natural wave dissipation combined pile body, and the design of the net-shaped structure meets the filter feeding environment of oyster cultivation. The repairing system is correspondingly designed based on an auxiliary structure and a field environment. The structure is simple, raw materials are easy to obtain, the protection engineering and the oyster reef body are organically combined, ecological environmental protection is achieved, and follow-up manual treatment is not needed.

The technical solution adopted in this invention is: a composite baffle-type fishway with adaptive water level variation, comprising: a flow channel with a consistent width and slope along its length; sidewalls respectively disposed on both sides of the flow channel; and several composite baffles installed within the flow channel, the composite baffles including a first baffle and a second baffle; the first baffle is located in front of the second baffle in the direction of water flow; wherein, the first baffle is composed of two trapezoidal symmetrical baffles fixedly connected to the sidewalls and the flow channel, forming a trapezoidal vertical slit flow structure that is narrow at the top and wide at the bottom; the second baffle is a composite structure that is U-shaped in plan and trapezoidal in elevation, narrow at the top and wide at the bottom, fixed at the centerline of the flow channel; there are gaps between the two sides of the second baffle and the sidewalls, forming an inverted trapezoidal vertical slit flow structure that is wide at the top and narrow at the bottom; this invention improves the fishway's ability to adapt to water level variation, forms a stable flow field conducive to fish swimming upstream, better protects fish, and reduces the obstructive impact of dams on watershed connectivity.

The utility model provides a novel freshwater fish catching netting gear which comprises a freshwater fish culture pond, a vertical main beam is placed on the left side wall inside the freshwater fish culture pond, a main beam top beam is embedded between two plates at the top end of the vertical main beam, and a main beam bottom plate is fixed below the vertical main beam. A trapezoid reinforcing frame and a reinforcing triangular side plate are welded between the vertical main beam and the main beam bottom plate, a cylinder body mounting base is fixed to an upper shaft sleeve at the center end of the main beam bottom plate, and through cooperation of a net frame fishing lifting hydraulic cylinder and a fishing net frame left-right moving hydraulic cylinder, lifting and left-right moving of the freshwater fish fishing net frame can be achieved; the fishing operation is accurately carried out in the culture pond, and the fishing efficiency is greatly improved. The trapezoidal reinforcing frame and the reinforcing triangular side plates are welded between the vertical main beam and the main beam bottom plate, the structural strength and stability of the whole fishing net are improved, it is guaranteed that the fishing net can bear certain pressure and tension in the fishing process, and the risk of equipment damage is reduced.

The invention belongs to the field of feeding for Chinese softshell turtle breeding, and particularly relates to a feeding device for Chinese softshell turtle breeding, which comprises a main body and an automatic feeding device, the automatic feeding device comprises a feeding hopper, the feeding hopper is located in the lifting device, the feeding hopper is a right trapezoid body with the top and the bottom being open, a quantity limiting device is arranged in the feeding hopper, a fixing table is fixedly arranged at the bottom of the feeding hopper, a threaded sleeve is fixedly arranged in the fixing table, and the threaded sleeve is fixedly connected with the lifting device. A threaded rod is in threaded connection with one side of the threaded sleeve, and a second servo motor is arranged at the end, away from the threaded sleeve, of the threaded rod in a transmission mode. A second servo motor in the automatic feeding device is started, the second servo motor rotates to drive a threaded rod to rotate, the threaded rod rotates to drive a threaded sleeve and a fixing table to move, the fixing table moves to drive a feeding hopper to move, and therefore the feeding hopper can stretch out and draw back to adapt to glass water tanks arranged in a trapezoid mode.

The invention relates to a composite micro-channel structure with wavy channels and staggered trapezoidal fins and application of the composite micro-channel structure. The composite micro-channel structure comprises an asymmetrical wave-shaped main channel and a plurality of trapezoidal fins arranged in the asymmetrical wave-shaped main channel in a staggered manner; the asymmetric wavy main channel extends in a continuous wavy shape in the flowing direction and comprises a plurality of continuous and repeated flow channel units. The curvature radius of the asymmetric wavy main channel at the wave crest is smaller than the curvature radius of the asymmetric wavy main channel at the wave trough; and the trapezoidal fins are periodically and obliquely distributed at wave crests and wave troughs of the asymmetric wavy main channel to induce fluid to form a Z-shaped flowing path in the channel. Compared with the prior art, the composite micro-channel structure disclosed by the invention can remarkably improve the mixing efficiency and the heat transfer performance of micro-scale fluid under the condition that external energy input is not needed through collaborative optimization of geometrical morphology and fluid dynamics.

The utility model relates to the technical field of juicers, and discloses a multi-section type spiral juicer which comprises a supporting frame, an extrusion juicing mechanism is arranged at the upper end of the supporting frame and comprises a bottom containing shell, the middle of the inner wall of the front end of the bottom containing shell is rotationally connected with a trapezoidal shaft, and the trapezoidal shaft is arranged in the middle of the inner wall of the front end of the bottom containing shell. An auger blade is fixedly connected to the outer wall of the trapezoidal shaft, a crushing mechanism is arranged on the front portion of the upper end of the squeezing and juicing mechanism, and the crushing mechanism comprises a middle containing shell. According to the multifunctional juicer, the dicing mechanism, the crushing mechanism and the squeezing and juicing mechanism can be independently disassembled and assembled, a user can splice proper mechanisms according to requirements, the modularized detachable design enables all parts to be cleaned more easily, the user can clean all the parts in a targeted mode, and the practicability is high. The accumulation of pomace or bacteria is avoided, so that the sanitation and the service life of the equipment are better maintained.

The invention relates to the technical field of insect catching devices, in particular to an electric shock type trapping device capable of preventing insects from hanging a net. The invention discloses an anti-net-hanging electric shock type trapping device for flying insects, the trapping device comprises an inducing device (6), a supporting device (5), an electric net (7) and an insect collecting device (2), the supporting device (5) is a supporting plate or a supporting frame, and the supporting device (5) is an inverted isosceles trapezoid; the power grid (7) is formed by winding a wire on the outer side of the supporting device or winding the wire through a hole in the supporting device. A certain angle is formed between the wire and the horizontal plane. The trapping device is convenient to assemble and can be disassembled for transportation; insects are not easy to hang on the power grid, and the long-term insect trapping effect is not reduced; the angle and the distance of the power grid can be adjusted according to different insects, and a better trapping effect is achieved.

The application belongs to the technical field of fishery culture tools, and particularly relates to an automatic micro water tank, which comprises a controller and a micro water tank body. The cross section of the micro water tank body in the length direction is trapezoidal. Two fixed blocks are fixed on the top of the micro water tank body in the length direction. A swing rod is arranged between the two fixed blocks and rotationally connected with the fixed blocks. Two shielding plates are arranged on the micro water tank body in the width direction and fixedly connected with the swing rod. The design of the arc-shaped stirring rod can cooperate with the inclined spray head. When the water sprayed by the inclined spray head drives the swing rod to swing, the arc-shaped stirring rod can stir the water in the micro water tank body, so that the dissolved oxygen content of the water in the micro water tank body is further improved, and the survival rate of the fry is further improved.

The present invention discloses a heat-insulating board based on a bionic butterfly light-trapping structure, belonging to the technical field of bionic materials. Inspired by the light-trapping structures on the lepidopteran surfaces of Kaniska canace and Papilio xuthus, two light-trapping structures are obtained therefrom, namely a ridge-type light-trapping structure or a grid groove light-trapping structure. Among them, the ridge-type light-trapping structure is composed of a plane and strip-shaped ridges protruding on the plane. The cross-section of the strip-shaped ridge is a trapezoid with a narrow upper base and a wide lower base. The width of the upper base of the trapezoid is 1.2 μm - 2.5 μm, the width of the lower base is 2 - 3.5 μm, the height is 2.4 μm - 3 μm, and the spacing between the ridges is 5 - 6 μm. The grid groove light-trapping structure is composed of an arrangement of a plurality of grid grooves. The shape of the grid groove is a frustum of a quadrangular pyramid. The cross-section of the grid groove is a trapezoid with a narrow upper base and a wide lower base. The width of the upper base is 0.6 μm to 0.8 μm, the width of the lower base is 0.3 μm to 0.4 μm, the height is 0.5 μm to 1 μm, and the groove interval is 0.1 μm. Through simulation tests, it is verified that its heat-insulating effect is significantly better than that of the existing heat-insulating wall body.

The invention relates to the technical field of deepwater aquaculture net cages, in particular to a long-acting anti-algae deepwater aquaculture net cage based on a polyethylene composite material and a manufacturing method, the long-acting anti-algae deepwater aquaculture net cage comprises a fishing box body, the fishing box body is arranged in a deepwater area, and the cross section of the fishing box body is of a trapezoidal structure; the connecting assemblies are mounted at the lower end of the fishing box body in a circumferential array manner and are used for fixing the fishing box body to prevent the fishing box body from floating away in sea waves; the fixing assembly is installed at the outer end of the connecting assembly, the lower face of the fixing assembly makes contact with the water bottom face, and resistance is provided when the fishing box body is stressed to move; the fixing anchor is mounted at the farthest end of the connecting assembly and fixed under sandy soil on the underwater bottom surface; the feeding assembly is installed on the fishing box body and used for improving the feeding efficiency and the feed feeding uniformity; and the positioning assembly is mounted in the middle of the right lower surface of the fishing box body, penetrates into sandy soil and serves as a positioning point basis for interval arrangement of the fishing box body.

A trap 1 for catching insects, such as Asian hornets, with a receptacle for receiving an insect attractant. The bait may be liquid and the receptacle may hold a volume of water. There is a closure 3 which may be releasably fastened 12 to the receptacle. The closure has a recessive surface, such as a cone or funnel, which extends into the receptacle, and an aperture 9 for allowing an insect into the receptacle. There are a plurality of fins, walls or partitions 30 on the receptacle, to guide the insect to the aperture. The fins may be upstanding, radially disposed on the funnel, or trapezoidal in shape. There may be bait odour vents on the recessive surface. There may be bycatch holes 10 to release smaller non-target insects. The trap may have feet 11 or an oversized closure so it can be rested horizontally on its side. The aperture may lead to an L shaped hollow elbow internal the receptacle, for reducing escape of the insects. The elbow may be perforated to allow odour through. A method of using the trap near beehives is disclosed. The trap may be immersed in water to exterminate trapped insects.

The invention relates to fish soluble concentration equipment and a concentration process thereof, belongs to the technical field of fish soluble concentration, and solves the defects of a traditional flange-sealing ring structure by adopting a quick-release sealing assembly. Self-locking sealing of automatically and horizontally rotating to be attached to the inner wall of a pipeline after vertical insertion is achieved, a bolt fastening mode is abandoned, a self-locking mechanism evenly applies pressure through radial component force of a conical sealing part, and leakage caused by uneven pre-tightening force is avoided; the roller guide part converts sliding friction into rolling friction, so that the dismounting resistance is reduced, and the sealing surface damage is reduced; the combined design of the trapezoid sealing ring and the elastic ring can adapt to the high-temperature expansion and corrosive environment, the influence of particle scouring and thermal stress is relieved, the damage risk of repeated disassembly to the sealing face is eliminated, and meanwhile the operation process is simplified.

The utility model discloses a small assembly type proliferation reef which comprises a bottom plate, and a plurality of proliferation frames are detachably installed on the bottom plate. The proliferation frame is reasonable in structure and novel in design, when the proliferation frame is spliced, the insertion blocks are inserted into the corresponding insertion grooves, due to the trapezoidal structures of the insertion grooves, the first side plates and the second side plates are spliced, after the proliferation frame is spliced, the proliferation frame is fixed to the bottom plate, and when the proliferation frame is installed on the bottom plate, the insertion blocks are inserted into the insertion grooves. A pair of mounting blocks at the lower end of a proliferation frame are inserted into the mounting grooves, finally, the proliferation frame is fixed, and when the proliferation frame is fixed to the bottom plate, the lead screws are spirally mounted in the threaded holes, the mounting blocks are fixed into the mounting grooves, so that the proliferation frame is fixed. And organisms in the proliferation frame can be conveniently taken out.

The utility model provides a self-adaptation heightened prefabricated structure and a mixed embankment body, the self-adaptation heightened prefabricated structure comprises a main body, the main body comprises a chamfered trapezoid block, a rectangular rib plate and a rectangular bottom plate, the rectangular rib plate is fixedly arranged at the top end of the chamfered trapezoid block, the rectangular bottom plate is fixed at the bottom of the chamfered trapezoid block, and toe-shaped structures are arranged on the two sides of the rectangular bottom plate. The slope ratio of the left side face and the right side face of the chamfered trapezoid block body is not larger than 1: 1, and the chamfered trapezoid block body is provided with a cavity penetrating through the front side and the rear side of the chamfered trapezoid block body. The slope ratio of the slope surfaces on the two sides of the chamfered trapezoid block is not larger than 1: 1, it is ensured that the resultant force of waves and water flow acting on the slope surfaces acts downwards, the effects of waves and water flow can be effectively resisted, and the overall stability of the component is improved. A slow flow siltation promotion area can be formed in the cavity in the component, and a good habitat can be provided for aquatic organisms. The ecological prefabricated part can be used as an upper structure of a mixed embankment, and can adapt to building of channel improvement buildings, breakwaters and the like at different water depths by adjusting the size of a block body and the size of a lower foundation bed.

The utility model relates to the technical field of aquariums, and provides an indoor goldfish culture aquarium which comprises a water supply system and a water storage tank communicated with the water supply system. The first fish culture tank, the second fish culture tank and the third fish culture tank are sequentially arranged in a stepped manner from top to bottom; the water inlet system communicates with the water storage tank; the drainage system is communicated with the first fish culture tank, the second fish culture tank and the third fish culture tank; the aeration sewage suction device is respectively connected with the first fish culture tank, the second fish culture tank and the third fish culture tank; and the illumination device is arranged below the water storage tank. According to the indoor goldfish culture aquarium, due to the fact that the first fish culture tank, the second fish culture tank and the third fish culture tank are arranged in a trapezoid mode, three-dimensional space can be effectively utilized, and goldfishes can be conveniently overlooked and viewed; a still water environment can be created through the aeration sewage suction device, and cultivation and viewing of the goldfish are facilitated; the defect of insufficient indoor illumination is overcome by utilizing the illumination device; the water storage tank and the water inlet and outlet system are designed, so that water inlet and outlet do not consume electric energy.

This invention belongs to the field of coastal ecological restoration and marine aquaculture technology. Specifically, it is an artificial composite reef structure, including a base. The base is a trapezoidal frame structure with multiple frame columns inside. The base columns are fixedly connected to the surface of the base, and the base columns are fixedly connected to the sleeves. The sleeves are slidably connected to the telescopic columns, and the telescopic columns are threadedly connected to the surface of the telescopic columns. The other end of the telescopic columns passes through the sleeves and the base columns, making a slidable connection. By combining the frame-type base with upwelling reefs and bird-standing stakes, a two- or three-layer artificial composite reef structure is formed, creating a multifunctional marine biological reef environment. This overcomes the problems of the single function and limited environment of ordinary biological reefs. It not only has a wider range of applicability, but also organically combines the two- or three-layer structure to create a multifunctional marine habitat, forming a three-in-one marine ecosystem integrating sea, land, and air.

The present application relates to the technical field of red imported fire ant control, and particularly relates to a red imported fire ant auxiliary trap, which comprises a trapping table, a trapping chamber, a guide support and a food lure support, etc., the trapping table is connected with the trapping chamber, the trapping table is in the shape of a trapezoid higher than the ground to reduce the speed of red imported fire ants returning to the nest, the trapping chamber is arranged at the rear end of the trapping table, the guide support is arranged on the trapping table, the food lure support is slidingly connected in the guide support, and the trap further comprises a power assembly, a conveying belt and a shaking mechanism, the power assembly drives the food lure support to move in the guide support, and the power assembly supplies power to the conveying belt. The power assembly can drive the food lure support to move horizontally, the clamping rod of the food lure support moves a large number of red imported fire ants eating to above the collecting bin, the second double-shaft motor drives the cam to rotate to continuously vibrate the clamping rod, the red imported fire ants on the clamping rod are shaken to fall into the collecting bin, and thus the red imported fire ants are efficiently trapped and killed.

The utility model relates to a trapezoidal tap interdigital filter, and particularly relates to the technical field of filters, the trapezoidal tap interdigital filter comprises a shell, the top of the shell is connected with a cover plate through a bolt, the shell is matched with the cover plate, a substrate is arranged in the middle between the shell and the cover plate, one end of the shell is provided with an input interface, and the other end of the shell is provided with an output interface. An input interface is formed in the shell, an output interface is formed in the side, away from the input interface, of the shell, the input interface and the output interface are located on the same straight line, resonators are arranged in the middle of the substrate, ground holes are formed in the ends of the resonators, and the input interface and the output interface are connected with the resonators on the two sides through tap structures. The tap structure comprises an external connection part, a transition part and a connection part. The mode of optimizing the tap structure is utilized to ensure that key performance indexes such as frequency selectivity, insertion loss, retardation inhibition and the like meet high-standard requirements, and the cost is reduced.

The utility model discloses a red imported fire ant poison bait station preventing rain and bird feeding, which comprises a bait base, the top of the bait base is provided with a rain-proof cover, four adjusting screws are inserted into the rain-proof cover, the bottom ends of the adjusting screws penetrate through the bait base and are in threaded connection with adjusting nuts, and the adjusting nuts are in threaded connection with the rain-proof cover. Triangular plates are integrally formed on the front face and the back face of the rainproof cover, slope pieces are installed at the bottoms of the triangular plates, and a trapezoidal bait box located below the rainproof cover is placed at the top of the bait base. According to the utility model, the influence of external rainy days on outdoor installation of the solenopsis invicta poison bait station can be reduced, the timeliness of bait is ensured, and a relatively closed environment is formed by the rainproof cover, the triangular plate and the bait base in order to avoid the reduction of bait dosage and the harm to birds due to mistaken eating of the birds, so that the solenopsis invicta poison bait station is convenient to carry and effectively avoids mistaken eating of the birds; the solenopsis invicta is specifically prevented and controlled.

The invention provides a compound ecological river section structure and an in-situ remediation construction method thereof, and relates to the technical field of water ecological remediation. The method comprises the steps that a hard lining of a river channel to be repaired is removed, and a compound permeable trapezoidal section is reconstructed; sequentially laying a bottom gravel layer, a middle porous filter material layer and a surface pebble layer at the bottom of the central main riverbed, and planting aquatic plants to form a multi-stage purification substrate; a permeable nail dam is built at the junction to disperse lateral scouring force, and a fish scale dam is built in the central main riverbed to produce falling fall so as to cooperate with a substrate to improve the purification efficiency; inner-layer geotechnical cloth, a slope protection gravel layer and outer-layer geogrids are sequentially laid on the surface of the lateral slope area to form a flexible anti-scouring base layer, prefabricated ecological building blocks are assembled on the outer side of the base layer, and indigenous plants are planted on the outer side of the base layer to form a composite ecological revetment; and a vegetation buffer zone is constructed at the top of the composite ecological revetment, and a front filtering barrier is formed to intercept non-point source pollution. The problems of river habitat blocking and revetment instability are solved.

The application discloses a kind of pinus massoniana planting protection frame in the technical field of forestry protection, including body, sliding rod is slidably connected in the body along vertical direction, rotating rod is hingedly connected to the top of sliding rod, and ball hinge head is arranged between rotating rod and sliding rod;Several screws are arranged on the outer wall of sliding rod, one end of screw passes through sliding rod, and screw is in abutment with ball hinge head;The cavity in the form of trapezoid is opened in the body, the bottom of sliding rod is fixedly connected with expansion pipe, the expansion pipe is formed by several expansion strips, the expansion pipe is located in the cavity, and the end of expansion pipe away from sliding rod is in abutment with the body;Several openings are arranged on the outer wall of the body, the opening is communicated with the cavity, when sliding rod moves to the lowest point, expansion strip extends from the opening;Rotating rod is rotated on sliding rod through ball hinge head, and it is convenient to support and protect pinus massoniana planted in different terrain;The cooperation of expansion pipe and body provides development space for the growth of pinus massoniana, and it is convenient to continue to protect pinus massoniana by protection frame.

The utility model discloses a floating bed for soilless culture, which comprises a floating bed body, the floating bed body is formed by combining and splicing a plurality of sub-floating beds, and two adjacent side surfaces of each sub-floating bed are integrally injection-molded with splicing inserts; according to the floating bed disclosed by the utility model, the splicing plug-ins are integrally formed on the two adjacent side surfaces of each sub-floating bed of the floating bed body in the injection molding manner, and the concave plug-in shells are integrally formed on the other two adjacent side surfaces of each sub-floating bed in the injection molding manner, so that the two sub-floating beds are close to each other; the splicing plug-in of one sub-floating bed is inserted into the concave plug-in shell of the sub-floating bed on the other side, because the splicing plug-in is provided with a W-shaped wrinkle part, and the left side and the right side of the splicing plug-in are respectively provided with clamping blocks with isosceles trapezoid structures, when the splicing plug-in is inserted into the concave plug-in shell, the W-shaped wrinkle part of the splicing plug-in deforms, so that the splicing plug-in of the sub-floating bed is inserted into the concave plug-in shell; when the clamping block extends to the position of the clamping groove formed in the inner side face of the concave insertion shell, the clamping block is connected with the clamping groove of the concave insertion shell in a clamped mode.

The invention belongs to the field of gas field development, and particularly relates to a novel method for predicting flowing bottomhole pressure of a multi-section fractured horizontal well based on three-phase seepage. In the method, in order to solve the problem that a traditional flow-back model cannot accurately describe the dynamic influence of gas release and expansion on flow-back due to simplification of a multiphase seepage process, the well bore oil nozzle throttling effect and a fracture network three-phase seepage equation are combined, and the well bottom flowing pressure change and the three-phase saturation change are synchronously solved by adopting a dynamic iterative algorithm; and quality conservation is ensured by using an improved trapezoidal integral method, and full-life-cycle dynamic prediction from flowback of the fracturing fluid to long-term production is realized. The method has theoretical rationality and practical production application value in practical application of gas reservoir extraction.

This application discloses a novel green breakwater structure for soil carbon reduction, comprising a trapezoidal slope, boulders, breast wall, water diversion pipe, drainage ditch, chamber, sealing stones, rack, lifting strip, manhole cover, round hole, first one-way valve, second one-way valve, first rubber sealing gasket, second rubber sealing gasket, trough, insert block, guide cavity, top trough, iron block, permanent magnet, first spring, mounting bracket, round pipe, hollow blade, fine hole, connecting groove, injection cylinder, third one-way valve, threaded rod, square hole, rubber sealing gasket, connecting ring, baffle, square rod, fixing block, connecting pipe, piston disc, rubber sealing sleeve, sphere, disc, injection pipe, sealing disc, second spring, coastline, wall, treatment area, nut, connecting block, and bolt. The advantage of this application is that it can control Spartina alterniflora at coastal locations, slow down the decomposition rate of soil organic carbon, and inhibit soil organic carbon decomposition and CO2 emissions.

The invention discloses an intensive breeding device of procambarus clarkii and an intensive artificial breeding method of the procambarus clarkii, and relates to the technical field of aquaculture. The intensive breeding device comprises a parent shrimp inhabiting and mating nest structure and an egg-carrying shrimp hatching and larva breeding nest structure which are arranged in a parent shrimp breeding pond and a hatching and larva breeding pond respectively. The parent shrimp inhabiting and mating nest structure comprises an inhabiting frame and an inner nest body, the inhabiting frame is a right trapezoid frame body, and multiple layers of partition plates are arranged in the middle of the right trapezoid frame body; the inner nest body is a right trapezoid body, and a plurality of inhabiting nests are formed in the inner nest body; an egg-carrying shrimp hatching and larva breeding nest structure comprises a hatching and breeding frame, hatching nest units and side nets. According to the device, the space utilization rate of the parent shrimps and the larvae in the parent shrimp breeding pond and the hatching and larva breeding pond is effectively increased, and the bearing number and the breeding density of the parent shrimps and the larvae in unit water are greatly increased. The invention further discloses an intensive artificial breeding method, intensive and batch production of egg-carrying shrimps and juvenile shrimps of the procambarus clarkii is achieved, and the productivity can be improved by more than 5 times.

The purpose of the invention is to provide a rigid walkway structure for raft-cages for the culture of marine species, the design of the structure allowing the formation of rigid rafts with a round, oval, circular or elliptical shape, among other shapes. The invention relates to at least one rigid walkway that is curved or has a trapezoidal geometric shape, for forming raft-cages with a circular, round, oval, elliptical or semicircular shape, among other geometric shapes, which comprises a base structure (2) formed by a structural frame comprising at least two curved lateral beams (5, 6) spaced parallel to each other and arranged longitudinally, along a longitudinal axis of the base structure (2), represented by arrow X in figure 1, wherein the curved lateral beams (5, 6) are concavely or convexly curved at a predetermined radius of curvature. The structural frame also comprises at least one curved central beam (7), which is concavely or convexly curved at a predetermined radius of curvature, wherein the curved lateral and central beams (5, 6, 7) are joined by their opposite ends (8, 8'), in a spaced manner, to transverse end beams (9, 10). The rigid walkways that are curved or have a trapezoidal geometric shape enable the formation of rigid floating structures with joints between articulated walkways, such as raft-cages for the culture of marine species, which structures have a circular, round, oval, elliptical or semicircular shape, among other geometric shapes, but not the square and rectangular shapes normally used in the technical field with this type of rigid walkway with articulated joints. The rigid walkways of the invention also improve the space of the confined culture volume, enhance the hydrodynamics of the raft-cage and make optimal use of the spaces granted under aquaculture concessions. The configuration of the raft-cages having rigid walkways that are curved or have a trapezoidal geometric shape of the present invention makes it possible to increase the size of the circular rafts normally used in the technical field, which are made of HDPE, since, given the strength of this type of rigid walkway and the articulated connection thereof, it is possible to form large circular, elliptical, oval, semicircular or round structures that ensure ease of operation and have adaptable forms but which are also very stable.

The invention belongs to the related technical field of plate-fin heat exchangers, and discloses a different-width perforated fin with trapezoidal vortex generators, which comprises corrugated fins, the trapezoidal vortex generators, trapezoidal through holes, an upper partition plate and a lower partition plate, the plurality of corrugated fins are periodically spaced at unequal widths and are fixedly arranged between the upper partition plate and the lower partition plate to form wide flow channel units and narrow flow channel units which are periodically alternated; a plurality of trapezoid vortex generators and trapezoid through holes are arranged on the corrugated fins, and the trapezoid vortex generators are arranged in the wide flow channel units and are arranged in a windward mode at an angle of 45-75 degrees with the incoming flow direction. According to the fin, various advantages of a trapezoidal vortex generator structure and a different-width flow channel structure are combined, the heat transfer capacity can be effectively enhanced, cold and hot fluid can be rapidly mixed, and the flow resistance loss is reduced. Compared with a traditional fin design, the heat exchanger has the advantages that the pressure loss increment is small, and the comprehensive heat exchange performance is remarkably improved.

The application discloses a synthetic clay mineral ecological slope protection plate with a fractal structure, which comprises a plate body and an accessory fixing device, and the overall form of the plate body has a fractal structure of a certain order, such as a Hilbert curve shape, a Sierpinski triangle, a Koch snowflake shape and the like. Taking a second-order Sierpinski triangle structure as an example, the plate body is designed in an equilateral triangle shape. The synthetic clay mineral ecological slope protection plate with the fractal structure is convenient for planting and managing aquatic and hygrophyte plants on the basis of ensuring the stability of a river and lake wetland bank slope, preventing erosion and resisting impact, greatly expands the habitat space of microorganisms, and improves the landscape effect and water purification capacity of the river and lake wetland bank slope; through the setting of the abutting grooves, the penetrating square holes, the pin cones, the first right-angle trapezoidal plates and the second right-angle trapezoidal plates, the two adjacent plate bodies are limited to each other, and the pin cones are embedded into the slope surface, so that the overall stability of the slope protection plate structure is further improved.

The utility model discloses a special protection device for submarine pipeline laying, which comprises a protection block, the lower surface of the protection block is provided with a trapezoidal groove, the lower surface of the protection block is symmetrically provided with fixing plates, and the upper surfaces of the fixing plates are fixedly connected with a fixing block. According to the special protection device for laying the submarine pipeline, through the arrangement of the protection blocks, the planting grooves and the seaweed seed bags, the trapezoidal grooves can protect the submarine pipeline, the protection blocks achieve the supporting and protecting purposes, falling objects are prevented from impacting and damaging the submarine pipeline, and the throwing device lifts the protection blocks through hanging rings connected with the fixing blocks on the fixing plates to sink into the seabed; in the process, the resistance of seawater to the protection blocks and the trapezoidal grooves can be reduced through gaps, the submarine pipeline can be hidden after the sea grass seed bags in the planting grooves grow into sea grass, meanwhile, the growing sea grass can reduce the ocean current speed to help sediment deposition, and the device can utilize the porous net plate to kill water flow and dissipate water flow energy; the method has a good protection effect and is eco-friendly.

The utility model provides a hollow attachment reef with bait culture, which comprises an attachment reef main body, the attachment reef main body comprises four hollow reef bodies, each hollow reef body is of a right trapezoid structure, the four hollow reef bodies are spliced to form the attachment reef main body, a rectangular channel is defined by the centers of the four hollow reef bodies, the inclined planes of the hollow reef bodies face outwards, and the inclined planes of the hollow reef bodies face outwards. Every two adjacent hollow reef bodies are connected with a reinforcing rib, and the two ends of each reinforcing rib are fixed to the inclined faces of the corresponding hollow reef body respectively. An upper opening is formed in the top of the hollow reef body, two side openings are formed in the two sides of the hollow reef body, an inclined plane opening is formed in the inclined plane of the hollow reef body, a tray is embedded in the upper opening, the edge of the top of the tray is attached to the opening of the rectangular channel, and a gravel layer is laid in the tray. A layer of broken stone is added at the top of the hollow reef body, an attachment surface can be provided to facilitate attachment and reproduction of algae in seawater, and the algae can improve the reproduction effect of fishes as high-quality natural bait of marine organisms.